Patent Publication Number: US-10790644-B2

Title: Method of assembling a switching module

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     Pursuant to 35 U.S.C. § 119(a), this application claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2018-0037095, filed on Mar. 30, 2018, which is herein expressly incorporated by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to a pressing device of a switching module and a method of assembling the switching module using the same. 
     2. Description of the Conventional Art 
     Due to the development of industry and the increase of the population, power demand is soaring, but power production is limited. 
     Accordingly, a power system for supplying power generated at a production site to a demand site stably without loss has become increasingly important. 
     There is a need for FACTS (Flexible AC Transmission System) facilities for power flow, system voltage, and stability improvement. The FACTS facilities include reactive power compensation apparatuses such as a SVC (Static Var Compensator) or a STATCOM (STATic synchronous COMpensator). These reactive power compensation apparatuses are connected in parallel to a power system to compensate for reactive power required in the power system. 
     The SVC may be configured by combining a Thyristor Controlled Reactor (TCR) that controls the phase of a reactor using a thyristor according to its application, a Thyristor Switched Capacitor (TSC) that switches a capacitor, a Fixed Capacitor Bank, and the like. 
     The SVC may include a thyristor valve connected to a transformer to control the voltage of the power system and a gate unit that controls the gate of the thyristor valve. 
     When a plurality of thyristors are connected in series to each other in the thyristor valve and conducted under the control of the gate unit, a high voltage or a high current flows through the thyristor. In addition, each thyristor is heavy and bulky, so it is not easy to handle. 
     Therefore, in order to construct a thyristor valve in an SVC as an assembly, many considerations such as the arrangement of the thyristor, the insulation of the thyristor, the heat dissipation of the thyristor, the weight of the thyristor, and the volume of the thyristor must be taken into account. 
     However, an optimal SVC-related switch assembly has not yet been developed to satisfy all of these requirements. 
     SUMMARY OF THE INVENTION 
     The present disclosure is provided to solve the foregoing and other problems. 
     Another object of the present disclosure is to provide a switch assembly of a reactive power compensation apparatus of a new structure. 
     Still another object of the present disclosure is to provide a switch assembly of a reactive power compensation apparatus having an optimal arrangement structure satisfying various requirements. 
     Yet still another object of the present disclosure is to provide a pressing device capable of easily raising a heavy switch and a cooling plate. 
     Still yet another object of the present disclosure is to provide a method of assembling a switching assembly that can be easily assembled using a pressing device. 
     In order to achieve the foregoing and other objects, according to an aspect of the present disclosure, there is provided a method of assembling a switching module comprising a plurality of switches and a plurality of cooling plates, and first and second supporting members that support the plurality of switches and the plurality of cooling plates, and the method may include arranging a first pressing support portion on the second supporting member; stacking the plurality of switches and the plurality of cooling plates along a vertical direction on the first pressing support portion; arranging a first pressing member and a first supporting member on the uppermost cooling plate among the plurality of cooling plates; supporting the first supporting member and the second supporting member using a plurality of support rods; separating between the first pressing support portion and the second supporting member by pressing the first pressing support portion using a pressing device; and inserting a second pressing support portion between the first pressing support portion and the second supporting member. 
     Here, the pressing device may include a pressure supply portion formed in a pipe shape to supply pressure, and a pressure transmission portion formed in a solid shape and connected to the pressure supply portion to operate by the pressure. 
     Furthermore, said separating between the first pressing support portion and the second supporting member may include inserting the pressure transmission portion through the second supporting member; allowing the pressure transmission portion to be brought into contact with the first pressing support portion; supplying pressure from the pressure supply portion of the pressing device to the pressure transmission portion; and pressing the first pressing support portion using the pressure from the pressure transmission portion to raise the cooling plate and the switch on the first pressing support portion. 
     Furthermore, said allowing the pressure transmission portion to be brought into contact with the first pressure support portion may include inserting a protruding portion formed at a front end of the pressure transmission portion into an insertion groove formed at a lower side of the first pressing support portion. 
     Furthermore, the second pressing support portion may include a plurality of support plates having different thicknesses, and a number of the support plates may vary according to a spacing distance between the first pressing support portion and the second supporting member. 
     In addition, the pressure supplied from the pressure supply portion may be hydraulic pressure. 
     According to another aspect of the present disclosure, there is provided a pressing device of a switching module including a plurality of switches and a plurality of cooling plates stacked along a vertical direction, first and second supporting members that support the plurality of switches and the plurality of cooling plates, a first pressing member coupled between the plurality of cooling plates and the first and second supporting members, and a first pressing support portion, and the pressing device may include a pressure supply portion that supplies pressure; a pressure transmission portion provided through the second supporting member to transmit the pressure to the first pressing support portion; and a fastening portion that fastens the pressure supply portion to the pressure transmission portion. 
     Here, the fastening portion may be coupled to an insertion guide portion provided through the second supporting member. 
     Furthermore, an insertion hole may be formed through the insertion guide portion, and the pressure transmission portion may be inserted into the insertion hole. 
     Furthermore, an outer diameter of the pressure transmission portion may be formed smaller than that of the pressure supply portion. 
     In addition, the insertion guide portion may have a vertical portion fitted into a mounting groove formed between the pressure transmission portion and the fastening portion. 
     The effects of the pressing device of the switching module and the assembly method of the switching module according to an embodiment of the present disclosure will be described as follows. 
     According to at least one of embodiments, a thyristor and a switch may be stacked in a vertical direction, thereby having an advantage capable of optimizing arrangement structure and minimizing the occupied area. 
     According to at least one of embodiments, a cooling plate through which cooling water flows on the upper and lower surfaces of the switch may be provided, thereby having an advantage of facilitating heat dissipation of the switch. 
     According to at least one of embodiments, the switch, the cooling plate, and the like may be modularized, thereby having an advantage of facilitating installation. 
     According to at least one of embodiments, a lower portion of the switching module may be pressed using the pressing device to insert the pressuring support portion between the electrode plate and the supporting member, thereby facilitating assembly to facilitate pressurization. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. 
       In the drawings: 
         FIG. 1  is a perspective view illustrating a switch assembly of a reactive power compensation apparatus according to an embodiment; 
         FIG. 2  is an exploded perspective view illustrating a switch assembly of a reactive power compensation apparatus according to an embodiment; 
         FIG. 3  is a plan view illustrating a switch assembly of a reactive power compensation apparatus according to an embodiment; 
         FIG. 4  is a front view illustrating a switching module according to an embodiment; 
         FIG. 5  is a perspective view illustrating a switching module according to an embodiment; 
         FIG. 6  is a perspective view illustrating a state in which a first switching module is pressed using a pressing device according to an embodiment; 
         FIG. 7  is a cross-sectional view illustrating a state in which a first switching module is pressed using a pressing device according to an embodiment; 
         FIG. 8  is an enlarged view illustrating a lower side of a first switching module using a pressing device according to an embodiment; 
         FIG. 9  is a perspective view illustrating a pressing device according to an embodiment; 
         FIG. 10  is a cross-sectional view illustrating a pressing device according to an embodiment; and 
         FIGS. 11 and 12  are flowcharts illustrating an embodiment of a method of assembling a switching module using a pressing device. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, the embodiments disclosed herein will be described in detail with reference to the accompanying drawings, and the same or similar elements are designated with the same numeral references regardless of the numerals in the drawings and their redundant description will be omitted. A suffix “module” and “unit” used for constituent elements disclosed in the following description is merely intended for easy description of the specification, and the suffix itself does not give any special meaning or function. In describing the embodiments disclosed herein, moreover, the detailed description will be omitted when specific description for publicly known technologies to which the invention pertains is judged to obscure the gist of the present disclosure. Furthermore, it should be understood that the accompanying drawings are merely illustrated to easily understand an embodiment disclosed herein, and therefore, the technological concept disclosed herein is not limited by the accompanying drawings, and the concept of the present disclosure should be understand to include all modifications, equivalents, and substitutes included in the concept and technological scope of the embodiment. 
       FIG. 1  is a perspective view illustrating a switch assembly of a reactive power compensation apparatus according to an embodiment, and  FIG. 2  is an exploded perspective view illustrating a switch assembly of a reactive power compensation apparatus according to an embodiment, and  FIG. 3  is a plan view illustrating a switch assembly of a reactive power compensation apparatus according to an embodiment. The reactive power compensating apparatus illustrated in  FIGS. 1 through 3  illustrate a stationary reactive power compensating apparatus, for instance, but the embodiment is not limited thereto. 
       FIGS. 1 through 3  illustrate a single switch assembly, but a plurality of switch assemblies electrically connected to each other are also possible. 
     &lt;Support Module&gt; 
     A switch assembly of a reactive power compensation apparatus according to an embodiment may provide a support module  400 . 
     The support module  400  may support all components constituting the reactive power compensation apparatus. The support module  400  may allow the components disposed thereon to be insulated from the earth. 
     The support module  400  may include a frame  401  including four columns and four connecting portions that connect these columns. The frame  401  may be made of a material having excellent insulation and excellent supporting strength. For instance, the frame  401  may be made of stainless steel or a steel beam. 
     For instance, the column may be provided with an insulating member  403  or the column itself may be the insulating member  403 . The insulating member  403  may be an insulator. The insulator is an insulating body used for insulating and supporting an electric conductor, and hard porcelain may be used for the insulating body, for instance. 
     Though will be described later, the support module  400  may be provided with a fastening portion for fastening an optical cable  397  or a fastening portion for fastening first and second main pipes  380 ,  390 . The optical cable  397  supplies a drive signal, for example, a gate signal, to a first switching module  100  or a second switching module  200 , or supplies various signals measured from the first switching module  100  or the second switching module  200 , for instance, a voltage signal, a current signal, a temperature signal, and the like, to a controller (not shown). The first and second main pipes  380 ,  390  supply cooling water to the first switching module  100  or the second switching module  200  to cool the first switching module  100  or the second switching module  200 . 
     &lt;First Switching Module  100 &gt; 
     A switch assembly of a reactive power compensation apparatus according to an embodiment may include the first switching module  100 . The first switching module  100  may have a first stack structure that is perpendicular to the support module  400 . The first switching module  100  will be described in detail with reference to  FIGS. 4 and 5 .  FIG. 4  is a front view illustrating a switching module according to an embodiment, and  FIG. 5  is a perspective view illustrating a switching module according to an embodiment. 
     Referring to  FIGS. 4 and 5 , the first switching module  100  may be disposed on the support module  400 . A second support plate  370  which will be described later is fastened to an upper surface of the support module  400 , and both the first switching module  100  and the second switching module  200  may be fastened to the second support plate  370 . A second support plate  370  may be disposed under the first switching module  100  and the second switching module  200 . Moreover, a first support plate  360  may be disposed over the first switching module  100  and the second switching module  200 . In this case, an upper side of each of the first and second switching modules  100 ,  200  may be fastened to the first support plate  360 . Accordingly, the first and second switching modules  100 ,  200  may be disposed between the first support plate  360  and the second support plate  370 . 
     The first switching module  100  may include a plurality of switches  101  stacked along a vertical direction with respect to the support module  400 . The first switching module  100  may be a forward switching module in which a current flows from the second electrode plate  110  to the first electrode plate  107  in an upward direction, for instance, but the present disclosure is not limited thereto. 
     The plurality of switches  101  may be connected in series to each other. A first switch is provided, a second switch is disposed on the first switch, and a second switch is disposed on the second switch. In this manner, the plurality of switches  101  may be arranged on the support module  400 . 
     The switch  101  may be formed in a circular shape when viewed from above, but the present disclosure is not limited thereto. The switch  101  includes a body, and a semiconductor device may be embedded in the body. The body may be made of insulating material. Each of the lower surface and the upper surface of the body may have a planar shape. 
     The switch  101  may be a semiconductor device, for instance, a thyristor. The switch  101  may include a gate, an anode, and a cathode. For instance, it is assumed that a first switch, a second switch, and a third switch are sequentially arranged on the support module  400 . In this case, the cathode of the second switch may be electrically connected to the anode of the first switch, and the anode of the second switch may be electrically connected to the cathode of the third switch. 
     The first switching module  100  may include a plurality of cooling plates  104  stacked along a vertical direction with respect to the support module  400 . The switch  101  may be disposed between the cooling plates  104 . The switch  101  and the cooling plate  104  may be alternately stacked. For instance, the cooling plate  104  is provided, the switch  101  is disposed on the cooling plate  104 , and the cooling plate  104  is disposed on the switch  101 . The cooling plate  104  may be provided on the uppermost switch among the plurality of switches  101  and the cooling plate  104  may be provided below the undermost switch among the plurality of switches  101 . In other words, when n switches  101  are provided therein, (n+1) cooling plates may be provided therein. In this case, the first switch is located on the first cooling plate, and the nth switch is located under the (n+1)th cooling plate. 
     The cooling plate  104  may have a rectangular shape, for instance, when viewed from above, but the present disclosure is not limited thereto. The size of the cooling plate  104  may be larger than that of the switch  101  at least. The switch  101  may be located at the center of the cooling plate  104 , but the present disclosure is not limited thereto. 
     The cooling plate  104  and the switch  101  may be in surface contact. For instance, an upper surface of the first cooling plate may be in surface contact with a lower surface of the first switch. A lower surface of the second cooling plate is in surface contact with an upper surface of the first switch, and an upper surface of the second cooling plate is in surface contact with a lower surface of the second switch. A lower surface of the third cooling plate may be in surface contact with an upper surface of the second switch. 
     As described above, the lower surface and the upper surface of the switch  101  are brought into surface contact with the cooling plate  104  disposed below and above the switch  101  to cool the switch  101  by the cooling plate  104 , thereby easily releasing heat generated from the switch  101 . The remaining switches other than the first switch, the second switch, and the third switch of the plurality of switches  101  and the remaining cooling plates other than the first cooling plate, the second cooling plates, and the third cooling plate of the plurality of cooling plates  104  may also have the foregoing arrangement structure. 
     The first switching module  100  may include first and second electrode plates  107 ,  110  that are electrically connected to a plurality of vertically disposed switches  101  (stacked in a vertical direction). 
     For instance, the first electrode plate  107  may be disposed on a switch located at the top among the plurality of vertically disposed switches  101 . For instance, the second electrode plate  110  may be disposed on a switch located at the bottom among the plurality of vertically disposed switches  101 . 
     As described above, the cooling plate  104  may be disposed above and below the switch  101  for cooling the switch  101 . Therefore, since the cooling plate  104  is located between the first electrode plate  107  and the switch  101 , the first electrode plate  107  may be electrically connected to the switch  101  through a connecting member (not shown), but the present disclosure is not limited thereto. Similarly, since the cooling plate  104  is located between the second electrode plate  110  and the switch  101 , the second electrode plate  110  may be electrically connected to the switch  101  through a connecting member (not shown). 
     The first and second electrode plates  110  may be copper plates made of copper (Cu), but the present disclosure is not limited thereto. 
     The first electrode plate  107  may be in surface contact with the cooling plate  104  disposed at the top and the second electrode plate  110  may be in surface contact with the cooling plate  104  disposed at the bottom. 
     The first switching module  100  may include first and second terminals  113 ,  116  connected to the first and second electrode plates  110 , respectively. 
     The first and second terminals  113 ,  116  may be made of a metal having excellent electrical conductivity. For instance, the first and second terminals  113 ,  116  may include copper (Cu) or aluminum (Al). 
     The first terminal  113  may be electrically connected to the first electrode plate  107 . The first terminal  113  may be bent at least once from the first electrode plate  107  and protruded along a lateral direction. For instance, the first terminal  113  may include a first region protruded from the first electrode plate  107  in a lateral direction, a second region extended subsequent to being bent in an upward direction from an end of the first region, and a third region extended from an end of the second region along a lateral direction. The second terminal  116  may be electrically connected to the second electrode plate  110 . The second terminal  116  may be bent at least once from the second electrode plate  110  and protruded along a lateral direction. For instance, the first terminal  113  and the second terminal  116  may be protruded in the same direction, but the present disclosure is not limited thereto. 
     The first and second terminals  113 ,  116  may be protruded along lateral directions opposite to each other. For instance, the first terminal  113  may be protruded along a first lateral direction, for instance, and the second terminal  116  may be protruded along a second lateral direction, for instance, opposite to the first lateral direction. 
     The first switching module  100  may include first and second supporting members  125 ,  128  provided to support a plurality of switches  101  and a plurality of cooling plates  104 . 
     The first and second supporting members  125 ,  128  may have a plate shape. The first and second supporting members  125 ,  128  may have a rectangular shape when viewed from above. 
     The first and second supporting members  125 ,  128  may be made of a material having excellent insulating properties and supporting strength. For instance, the first and second supporting members  125 ,  128  may be made of stainless steel. 
     For instance, the first supporting member  125  may be disposed above the top cooling plate among the plurality of cooling plates  104 . For instance, the second supporting member  128  may be disposed under the bottom cooling plate among the plurality of cooling plates  104 . 
     A size of each of the first and second supporting members  125 ,  128  may be larger than that of the cooling plate  104 . The size of each of the first and second supporting members  125 ,  128  is large, and thus the support rods  135 ,  136 ,  137 ,  138 , which will be described later, may be spaced apart from the cooling plate  104  and disposed on a side surface of the switch  101  and the cooling plate  104 . In other words, the fastening of the support rods  135 ,  136 ,  137 ,  138  may be facilitated because the support rods  135 ,  136 ,  137 ,  138  are not disturbed by the cooling plate  104 . 
     The first switching module  100  may include a plurality of support rods  135 ,  136 ,  137 ,  138  disposed between the first supporting member  125  and the second supporting member  128 . Although four support rods  135 ,  136 ,  137 ,  138  are illustrated in the drawing, four or fewer or four or more support rods may be provided. 
     The support rods  135 ,  136 ,  137 ,  138  have a circular shape when viewed from above, but the present disclosure is not limited thereto. The support rods  135 ,  136 ,  137 ,  138  are disposed between the first supporting member  125  and the second supporting member  128  so that one side is fastened to the first supporting member  125  and the other side is connected to the second supporting member  128 . The first and second supporting members may be supported by the support rods  135 ,  136 ,  137 . 
     The support rods  135 ,  136 ,  137 ,  138  may be made of a material having excellent insulating properties and supporting strength. For instance, the support rods  135 ,  136 ,  137 ,  138  may be made of stainless steel. 
     The first switching module  100  may include first and second pressing members  131 ,  134  for pressing a plurality of switches  101  and a plurality of cooling plates  104  in a vertical direction. 
     The first and second pressing members  131 ,  134  may have elasticity. For instance, a first pressing member  131  may be pressed in a downward direction by the first supporting member  125 . A plurality of switches  101  and a plurality of cooling plates  104  disposed below the first pressing member  131  may also be pressed in a downward direction as the first pressing member  131  is pressed in a downward direction. For instance, a second pressing member  134  may be pressed in an upward direction by the second supporting member  128 . A plurality of switches  101  and a plurality of cooling plates  104  disposed above the second pressing member  134  may also be pressed along an upward direction as the second pressing member  134  is pressed in an upward direction. 
       FIG. 6  is a perspective view illustrating a state in which a first switching module is pressed using a pressing device according to an embodiment, and  FIG. 7  is a cross-sectional view illustrating a state in which a first switching module is pressed using a pressing device according to an embodiment, and  FIG. 8  is an enlarged view illustrating a lower side of a first switching module using a pressing device according to an embodiment. 
     Referring to  FIGS. 6 and 7 , the first pressing member  131  may be disposed between the first supporting member  125  and the first electrode plate  107 . The first pressing member  131  may include a pressing portion  151  and an elastic portion  153 . The pressing portion  151  and the elastic portion  153  may be disposed between the first supporting member  125  and the first electrode plate  107 . 
     The pressing portion  151  may be disposed between the elastic portion  153  and the first electrode plate  107 . The elastic portion  153  may be disposed between the first supporting member  125  and the pressing portion  151 . 
     The pressing portion  151  includes a first region  151   a  in surface contact with a cooling plate located at the top of a plurality of cooling plates  104 , a second region  151   b  extended in an upward direction from the first region  151   a , and a third region  151   c  extended above the first supporting member  125  from the second region  151   b  through the first supporting member  125 . 
     The elastic portion  153  may surround the second region  151   b  of the pressing portion  151  and surround the first region  151   a  located under the first supporting member  125 . The elastic portion  153  may be made of an elastic material. The pressing portion  151  may be moved in an upward direction by pressure generated from a lower side of the first switching module  100 . The pressing portion  151  moved in an upward direction may be restored when pressure generated from a lower side of the first switching module  100  is released. 
     As illustrated in  FIG. 8 , the second pressing member  134  may be disposed between the second electrode plate  110  and the second supporting member  128 . 
     The second pressing member  134  may include a first pressing support portion  161  and a second pressing support portion  163 . An insertion guide portion  165  may not be included in the second pressing member  134  but may exist as a separate component. 
     The first pressing support portion  161  may be disposed between the second electrode plate  110  and the second supporting member  128 . 
     The insertion guide portion  165  may guide the insertion of the pressing device  180  to press the first pressing support portion  161  by the pressing device  180 . 
     The pressing device  180  may include a cylinder. For the cylinder, a hydraulic cylinder may be used, but the present disclosure is not limited thereto. 
     As illustrated in  FIGS. 9 and 10 , the pressing device  180  may include a pressure supply portion  181  for supplying a pressure generated by the pump, that is, a hydraulic pressure, and a pressure transmission portion  183  for transmitting the generated pressure. 
     The pressing device  180  may further include a fastening portion  185  for fastening the pressure supply portion  181  to the pressure transmission portion  183 . 
     The fastening portion  185  may be formed in a pipe shape. The pressure supply portion  181  is fixedly coupled to one side of the fastening portion  185 , and the pressure transmission portion  183  may be movably coupled to the other side of the fastening portion  185 . 
     In  FIG. 8 , D 1  indicates an outer diameter of the pressure transmission portion  183  and an inner diameter of the insertion hole  164  of the insertion guide portion  165  which will be described later. D 2  indicates an outer diameter of the pressure supply portion  181  and an inner diameter of the fastening portion  185 . D 1  is formed smaller than D 2 . 
     The outer diameter (D 1 ) of the pressure transmission portion  183  is formed smaller than the inner diameter (D 2 ) of the fastening portion  185 , and thus there exists a gap between the fastening portion  185  and the pressure transmission portion  183 . At this time, a cylindrically shaped space formed at a gap between the fastening portion  185  and the pressure transmission portion  183  will be referred to as a mounting groove  184 . 
     The pressure transmission portion  183  is inserted into the insertion hole  164  to couple the pressing device  180  to the insertion guide portion  165 . At this time, the pressure transmission portion  183  is inserted into the insertion hole  164 , and the vertical portion  166   b  of the insertion guide portion  165  is fitted into the mounting groove  184  of the fastening portion  185 . 
     The pressure supply portion  181  is formed in a pipe shape to supply pressure generated by an external pressure generation device such as a pump. 
     The pressure transmission portion  183  is formed in a solid shape to supply pressure to the first pressure support portion  161  by pressure supplied from the pressure supply portion  181 . 
     The pressing device  180  may further include a cable  189  that is a path connected between the pressure supply portion  181  and a pump (not shown) to transmit hydraulic pressure generated by the pump to the pressure supply portion  181 . 
     The pressure transmission portion  183  may include a protruding portion  187 . The protruding portion  187  may be provided at one end of the pressure transmission portion  183 . 
     The insertion guide portion  165  may include a horizontal portion  166   a  disposed on the second supporting member  128  and a vertical portion  166   b  extended through the second supporting member  128  from the horizontal portion  166   a . The horizontal portion  166   a  may be in surface contact with the second pressing support portion  163 . The vertical portion  166   b  may include an insertion hole  167  for inserting the pressing device  180 , specifically, the pressure transmission portion  183  of the pressing device  180 . The pressure transmission portion  183  of the pressuring device  180  may be inserted through an insertion hole  167  of the insertion guide portion  165  to transmit the pressure of the pressure transmission portion  183  to the first pressing support portion  161 . 
     The vertical portion  166   b  of the insertion guide portion  165  may be protruded below the second supporting member  128  through the second supporting member  128 . The vertical portion  166   b  may be provided with an insertion hole  167  formed therein to have a cylindrical shape having a predetermined thickness between the inner surface and the outer surface. Accordingly, the pressure transmission portion  183  of the pressing device  180  may be inserted into the insertion hole  167  of the insertion guide portion  165 , and the protruding portion  187  of the pressure transmission portion  183  may be inserted into the insertion hole  167  of the first pressing support portion  161 . In this case, the vertical portion  166   b  of the insertion guide portion  165  may be inserted into the mounting groove  184  of the fastening portion  185  of the pressing device  180 . 
     Accordingly, the pressing device  180  is fixed in at least two regions, and thus the pressurization of the pressing device  180  may be more easily carried out. In other words, a first region of the pressing device  180 , for instance, the protruding portion  187  of the pressure transmission portion  183  may be fixed to the insertion groove  162  of the first pressure support portion  161 , and the vertical portion  166   b  of the insertion guide portion  165  disposed on the second supporting member  128  may be inserted and fixed to a second region of the pressing device  180 , for instance, the mounting groove  184  of the second region. 
     The first pressing support portion  161  may include an insertion groove  162  corresponding to the protruding portion  187  of the pressure transmission portion  183  the pressing device  180 . The insertion groove  162  may be provided on a lower surface of the first pressing support portion  161 . The insertion groove  162  may be formed inwardly from the lower surface of the first pressing support portion  161 . The shape of the insertion groove  162  of the first pressing support portion  161  may correspond to that of the protruding portion  187  of the pressure transmission portion  183  of the pressing device  180 . For instance, when the protruding portion  187  of the pressure transmission portion  183  of the pressing device  180  is formed in a cylindrical shape, the insertion groove  162  of the first pressing support portion  161  may also have a cylindrical shape. The insertion groove  162  of the first pressing support portion  161  allows the pressing device  180  to be stably fixed, and allows the first pressing support portion  161  to be stably pressed by the pressing device  180 . 
     Although one insertion groove  162  is provided at the center of the first pressing support portion  161  on the drawing, at least two insertion grooves  162  spaced at the same distance radially from the center of the first pressing support portion  161 , for instance, may also be provided. 
     The second pressing support portion  163  may include a plurality of support plates. For instance, the support plate may include first to third support plates. The first support plate may be disposed on the insertion guide portion  165 , and the second support plate may be disposed on the first support plate, and the third support plate may be disposed on the second support plate. The first support plate may include at least one or more support plates. The second support plate may include at least one or more support plates. The third support plate may include at least one or more support plates. 
     The second support plate may be made of an elastic material. The first support plate may be disposed above the second support plate. The first support plate may be disposed below the second support plate. 
     A thickness of the first support plate may be greater than that of the second support plate. A thickness of the third support plate may be greater than that of the second support plate. 
     The first pressing support portion  161  may be pressed by the pressing device  180  to allow the first pressing support portion  161  and the second supporting member  128  to be space apart from each other. In this case, the second pressing support portion  163  may be fitted or inserted along a lateral direction between the first pressing support portion  161  and the second pressing support portion  128 . To this end, the second pressure support portion  163  may include an opening  177  at one side thereof. 
     A number of the first through third support plates or a number of each of the first through third support plates may vary according to a size of distance between the first pressing support portion  161  and the second supporting members  128 . 
     The first switching module  100  may include a plurality of thyristors and a signal generation unit  140  disposed on a side surface of the plurality of cooling plates  104 . 
     The signal generation unit  140  may include a substrate  141  and a plurality of drive units  143  mounted on the substrate  141 . The signal generation unit  140  may further include a signal line  145  electrically connecting the drive unit  143  and each switch  101 . The drive unit  143  may generate a gate signal for switching each switch  101  to provide it to the each switch  101  through each signal line  145 . Each switch  101  may be switched by the gate signal. 
     One side of the substrate  141  may be fastened to the first supporting member  125  and the other side thereof may be fastened to the second supporting member  128 . 
     &lt;Second Switching Module  200 &gt; 
     A switch assembly of a reactive power compensation apparatus according to an embodiment may include the second switching module  200 . The second switching module  200  may be a reverse switching module in which a current flows from the first electrode plate  107  to the second electrode plate  110  in a downward direction, for instance, but the present disclosure is not limited thereto. 
     The second switching module  200  may also be pressurized using the pressing device illustrated in  FIGS. 9 and 10 . A method of pressing the first switching module  100  has been described in detail with reference to  FIGS. 6 through 8  as described above. Since the pressing method of the second switching module  200  is also the same as that of the first switching module  100 , it may be easily understood from  FIGS. 6 through 8  and the description related thereto. 
     The second switching module  200  may be disposed on the same plane as the first switching module  100 . In other words, the second switching module  200  may be mounted on an upper surface of the support module  400 . For instance, the first switching module  100  may be disposed on a first region of the support module  400 , and the second switching module  200  may be disposed on a second region of the support module  400 . 
     The second switching module  200  may include a plurality of switches  201 , a plurality of cooling plates  204 , first and second electrode plates  207 ,  210 , first and second terminals  213 ,  216 , first and second supporting members  225 ,  228 , a plurality of support rods  235 ,  236 ,  237 ,  238 , first and second pressing members  231 ,  234  and a signal generation unit  240 . 
     The switch  201  of the second switching module  200  may have the same structure as that of the switch  201  of the first switching module  100 . The cooling plate  204  of the second switching module  200  may have the same structure as the cooling plate  104  of the first switching module  100 . The first and second electrode plates  207 ,  210  of the second switching module  200  may have the same structure as the first and second electrode plates  107 ,  110  of the first switching module  100 . The first and second electrode plates  213 ,  216  of the second switching module  200  may have the same structure as the first and second terminals  113 ,  116  of the first switching module  100 . The first and second supporting members  225 ,  228  of the second switching module  200  may have the same structure as the first and second supporting members  125 ,  128  of the first switching module  100 . The support rod of the second switch module  200  may have the same structure as the support rod of the first switching module  100 . The first and second electrode plates  231 ,  234  of the second switching module  200  may have the same structure as the first and second pressing members  131 ,  134  of the first switching module  100 . The signal generation unit  240  of the second switching module  200  may have the same structure as the signal generation unit  140  of the first switching module  100 . Accordingly, each component of the second switching module  200  may be easily understood from the respective components of the first switching module  100  described in detail above, and thus each component of the second switching module  200  will be briefly described. 
     A plurality of cooling plates  204  are provided, and a switch  201  may be disposed between the cooling plates  204 . In other words, the second switching module  200  may have a second stack structure in which a plurality of cooling plates  204  and a plurality of switches  201  are stacked along a vertical direction with respect to the support module  400 . 
     The cooling plate  204  and the switch  201  may be in surface contact. As described above, the lower surface and the upper surface of the switch  201  are brought into surface contact with the cooling plate  204  disposed below and above the switch  201  to cool the switch  201  by the cooling plate  204 , thereby easily releasing heat generated from the switch  201 . 
     The first electrode plate  207  may be disposed on a switch located at the top among the plurality of vertically disposed switches  201 . For instance, the second electrode plate  210  may be disposed on a switch located at the bottom among the plurality of vertically disposed switches  201 . 
     The cooling plate  204  may be located between the first electrode plate  207  and the switch  201 . 
     The first terminal  213  may be electrically connected to the first electrode plate  207 , and bent at least once from the first electrode plate  207  and protruded along a lateral direction. The second terminal  216  may be electrically connected to the second electrode plate  210 , and bent at least once from the second electrode plate  210  and protruded along a lateral direction. The first and second terminals  213 ,  216  may be protruded along lateral directions opposite to each other. 
     The first supporting member  225  is disposed above the top of the plurality of cooling plates  204 , and the second supporting member  228  is disposed below the bottom of the plurality of cooling plates  204 . Accordingly, a plurality of switches  201  and a plurality of cooling plates  201  disposed between the first supporting member  225  and the second supporting member  228  may be supported by the first supporting member  225  and the second supporting member  228 . 
     A plurality of support rods may be fastened to the first supporting member  225  and the second supporting member  228  to support the first and second supporting members. 
     The plurality of switches  201  and the plurality of cooling plates  204  disposed between the first and second pressing members  231 ,  234  may be pressed by the first and second pressing members  231 ,  234 . 
     The signal generation unit  240  may include a substrate  241  and a plurality of drive units  243  mounted on the substrate  241 . The signal generation unit  240  may further include a signal line  245  electrically connecting the drive unit  243  and each switch  201 . The signal generation unit  240 , as a member for generating a gate signal for switching each switch  201 , may be disposed on a side surface of the plurality of switches  201  and the plurality of cooling plates  204  and fastened to the first supporting member  225  and the second supporting member  228 . 
     &lt;Connection Cooling Plate  105 &gt; 
     A switch assembly of a reactive power compensation apparatus according to an embodiment may include a connection cooling plate  105  for connecting a cooling unit of the first switching module  100  and a cooling unit of the second switching module  200 . 
     The connection cooling plate  105  may be made of the same material as that of the cooling unit of the first switching module  100  and the cooling unit of the second switching module  200 , but the present disclosure is not limited thereto. 
     The connection cooling plate  105  is detachable from the cooling unit of the first switching module  100  and the cooling unit of the second switching module  200 . In other words, the connection cooling plate  105  may be fastened or unfastened to the cooling unit of the first switching module  100  and the cooling unit of the second switching module  200 . 
     &lt;Connection Electrodes  117 ,  118 &gt; 
     The switch assembly of the reactive power compensation apparatus according to an embodiment may include first and second connecting electrodes  117 ,  118 . 
     The first connecting electrode  117  may fasten a first terminal  113  of the first switching module  100  and a first terminal  213  of the second switching module  200 . Accordingly, the first terminal  113  of the first switching module  100  and the first terminal  213  of the second switching module  200  may be electrically connected to the first connecting electrode  117 . 
     The second connecting electrode  118  may fasten a second terminal  116  of the first switching module  100  and a second terminal  216  of the second switching module  200 . Accordingly, the second terminal  116  of the first switching module  100  and the second terminal  216  of the second switching module  200  may be electrically connected to the second connecting electrode  118 . 
     &lt;First and Second Bus Bars  119 ,  122 &gt; 
     The switch assembly of the reactive power compensation apparatus according to an embodiment may include first and second bus bars  119 ,  122 . 
     The first bus bar  119  may be fastened to the first connecting electrode  117 . At least one or more first bus bars may be fastened to the first connecting electrode  117 . The first bus bar  119  may be bent at least once from the first connecting plate  117  and protruded along a lateral direction. The second bus bar  122  may be fastened to the second connecting electrode  118 . At least one or more second bus bars may be fastened to the second connecting electrode  118 . The second bus bar  122  may be bent at least once from the second connecting plate  118  and protruded along a lateral direction. 
     The first and second bus bars  119 ,  122  may be protruded along lateral directions opposite to each other. 
     In the embodiment, the first electrode plates  107 ,  207 , the second electrode plates  110 ,  210 , the first terminals  113 ,  213 , the second terminals  116 ,  216 , the first connecting electrode  117 , the second connecting electrode  118 , the first bus bar  119 , and the second bus bar  122  may be made of a metal material having excellent electrical conductivity. The first electrode plates  107 ,  207 , the second electrode plates  110 ,  210 , the first terminal  117 , the second terminal  118 , the first bus bar  119 , and the second bus bar  122  may be made of the same metal material, but the present disclosure is not limited thereto. 
     &lt;Snubber Circuits  300 ,  310 ,  320 ,  330 &gt; 
     The switch assembly of the reactive power compensation apparatus according to an embodiment may include snubber circuits  300 ,  310 ,  320 ,  330 . 
     The snubber circuit may include a first resistor module  300 , a second resistor module  310 , a first capacitor module  320 , and a second capacitor module  330 . 
     The first resistor module  300  may include a first resistor substrate  301  and a plurality of first resistor devices  303  mounted on the first resistor substrate  301 . For instance, the plurality of first resistor devices  303  may be connected in series. The second resistor module  310  may include a second resistor substrate  311  and a plurality of second resistor devices  313  mounted on the second resistor substrate  311 . For instance, the plurality of second resistor devices  313  may be connected in series. 
     The first capacitor module  320  may include a first capacitor substrate  321  and a plurality of first capacitor devices  323  mounted on the first capacitor substrate  321 . For instance, the plurality of first capacitor devices  323  may be connected in parallel. The second capacitor module  330  may include a second capacitor substrate  331  and a plurality of second capacitor devices  333  mounted on the second capacitor substrate  331 . For instance, the plurality of second capacitor devices  333  may be connected in parallel. 
     In terms of electric circuit, the first resistor device  303  and the second resistor device  313  are connected in series, and the first and second capacitor devices  303 ,  313  are connected between the first resistor device  303  and the second resistor device  313 . The first and second capacitor devices  321 ,  333  may are connected in parallel. 
     In terms of arrangement structure, the first resistor substrate  301  of the first resistor module  300  may be fastened to the first supporting member  125  at one side and fastened to the second supporting member  128  at the other side. The second resistor substrate  311  of the second resistor module  310  may be fastened to the first supporting member  225  at one side and fastened to the second supporting member  228  at the other side. The first capacitor substrate  321  of the first capacitor module  320  may be fastened to the first supporting member  125  at one side and fastened to the second supporting member  128  at the other side. The second capacitor substrate  331  of the second capacitor module  330  may be fastened to the first supporting member  225  at one side and fastened to the second supporting member  228  at the other side. Moreover, the first resistor module  300  may be disposed on one side of the first switching module  100 , and the second resistor module  310  may be disposed on one side of the second switching module  200 . The first and second capacitor modules  320  may be disposed on the other side of the first switching module  100 , and the second capacitor module  330  may be disposed on the other side of the second switching module  200 . 
     In terms of cooling, first branch pipes  381 ,  383  branched from the first main pipe  380  are connected to the cooling plate  104  of the first switching module  100  and the cooling plate  204  of the second switching module  200 . The first connection pipe  411  may be connected between the cooling plate  104  of the first switching module  100  and the resistor device  303  of the first resistor module  300 . The second connection pipe  413  may be connected between the cooling plate  204  of the second switching module  200  and the resistor device  313  of the second resistor module  310 . The second branch pipes  391 ,  393  may be connected from the second main pipe  390  to the resistor device  303  of the first resistor module  300  and the resistor device  313  of the second resistor module  310 . Accordingly, cooling water is supplied to the cooling plate  104  of the first switching module  100  and the cooling plate  204  of the second switching module  200  through the first main pipe  380  and the first branch pipes  381 ,  383  to cool the switch  101  of the first switching module  100  and the switch  201  of the second switching module  200 , and then discharged through the first and second connection pipes  411 ,  413 , the second branch pipes  391 ,  393  and the second main pipe  390 . 
     &lt;First and Second Supporting Plates  360 ,  370 &gt; 
     The switch assembly of the reactive power compensation apparatus according to an embodiment may include first and second support members  360 ,  370  disposed above and below the first and second switching modules  100 ,  200 . 
     The first and second switching modules  100 ,  200  may be disposed between the first support plate  360  and the second support plate  370 . The first and second switching modules  100 ,  200  may be supported by the first support plate  360  and the second support plate  370 . For instance, an upper side of the first and second switching modules  100 ,  200  is fastened to the first support plate  360  and a lower side of the first and second switching modules  100 ,  200  is fastened to the second support plate  370 . The second support plate  370  may be fastened to an upper side of the support module  400 . 
     &lt;First and Second Corona Shields  340 ,  350 &gt; 
     The switch assembly of the reactive power compensation apparatus according to an embodiment may include first and second corona shields  340 ,  350 . 
     The first and second corona shields  340 ,  350  may have a ring shape larger than a size of each of the first and second support plates  360 ,  370 . Each of the first and second corona shields  340 ,  350  may be disposed to surround the first and second support plates  360 ,  370 , and fastened to at least one or more regions of the first and second support plates  360 ,  370 . Since the first and second corona shields  340 ,  350  are larger than the size of each of the first and second support plates  360 ,  370 , the first and second corona shields  340 ,  350  may be disposed to be spaced apart in an outward direction from each of the first and second support plates  360 ,  370 . Accordingly, as intermediate connecting members, a plurality of fastening connecting portion may be provided to fasten the first and second corona shields  340 ,  350  to the first and second support plates  360 ,  370 . 
     &lt;First and Second Main Pipes  380 ,  390 , First and Second Branch Pipes  381 ,  383 ,  391 ,  393 , and First and Second Connecting Pipes  411 ,  413 &gt; 
     The reactive power compensating apparatus according to an embodiment may include first and second main pipes  380 ,  390 , first and second branch pipes  381 ,  383 ,  391 ,  393 , and first and second connecting pipes  411 ,  413 . 
     The first main pipe  380  may be disposed on one side surface of one of the first and second switching modules  100 ,  200 . The second main pipe  390  may be disposed on the other side surface of one of the first and second switching modules  100 ,  200 . 
     The first branch pipes  381 ,  383  may be branched from the first main pipe  380  in both directions and connected to the cooling plates  104 ,  204  of the first and second switching modules  100 ,  200 , respectively. The second branch pipes  391 ,  393  may be branched from the second main pipe  390  in both directions and connected to the resistor devices  303 ,  313  of the first and second resistor modules  300 ,  310 , respectively. 
     The first connection pipe  411  may be connected between the cooling plate  104  of the first switching module  100  and the resistor device  303  of the first resistor module  300 . The second connection pipe  413  may be connected between the cooling plate  204  of the second switching module  200  and the resistor device  313  of the second resistor module  310 . 
     Accordingly, cooling water is supplied to the cooling plate  104  of the first switching module  100  and the cooling plate  204  of the second switching module  200  through the first main pipe  380  and the first branch pipes  381 ,  383  to cool the switch  101  of the first switching module  100  and the switch  201  of the second switching module  200 , and then discharged through the first and second connection pipes  411 ,  413 , the second branch pipes  391 ,  393  and the second main pipe  390 . 
     For instance, the first and second main pipes  380 ,  390 , the first and second branch pipes  381 ,  383 ,  391 ,  393  and the first and second connection pipes  411 ,  413  may be made of different materials. For instance, the first and second main pipes  380 ,  390 , the first and second branch pipes  381 ,  383 ,  391 ,  393  may be made of a resin material, and the first and second connection pipes  411 ,  413  may be made of a copper (Cu) material. 
     The first and second connection pipes  411 ,  413  are disposed adjacent to the switches  101 ,  201  of the first and second switching modules  100 ,  200 . A considerable amount of heat is generated in the switches  101 ,  201  of the first and second switching modules  100 ,  200 , and thus the first and second connection pipes  411 ,  413  must be formed of a material having excellent heat resistance. Therefore, the first and second connection pipes  411 ,  413  are made of copper, and thus not affected by heat generated by the switches  101 ,  201  of the first and second switching modules  100 ,  200 . 
     The first and second main pipes  380 ,  390  and the first and second branch pipes  381 ,  383 ,  391 ,  393  are disposed on an outer surfaces of the first and second switching modules  100 ,  200 , and thus hardly affected by heat generated by the switching of the first and second switching modules  100 ,  200 . Therefore, a resin material which is cheaper than copper may be used for the first and second main pipes  380 ,  390  and the first and second branch pipes  381 ,  383 ,  391 ,  393 . 
     In the above description, the first switching module  100  may be referred to as a second switching module, and the second switching module  200  may be referred to as a first switching module. The first electrode plate  107 ,  207  may be referred to as a second electrode plate and the second electrode plate  110 ,  210  may be referred to as a first electrode plate. The first terminal  113 ,  213  may be referred to as a second terminal, and referred to as a second terminal  116 ,  216 . The first connecting electrode  117  may be referred to as a second connecting electrode, and the second connecting electrode  118  may be referred to as a first connecting electrode. The first bus bar  119  may be referred to as a second booth bar, and the second bus bar  122  may be referred to as a first booth bar. The first supporting member  125 ,  225 ,  360  may be referred to as a second supporting member, and the second supporting member  128 ,  228 ,  370  may be referred to as a first supporting member. The first pressing member  131 ,  231  may be referred to as a second pressing member, and the second pressing member  134 ,  234  may be referred to as a first pressing member. The first resistor module  300  may be referred to as a second resistor module, and the second resistor module  313  may be referred to as a first resistor module. The first main pipe  380  may be referred to as a second main pipe, and the second main pipe  390  may be referred to as a first main pipe. The first connection pipe  411  may be referred to as a second connection pipe, and the second connection pipe  413  may be referred to as a first connection pipe. 
     Hereinafter, a method of assembling the switching module using the pressing device according to an embodiment of the present disclosure will be described with reference to  FIGS. 11 through 12 . The detailed content of the assembly method is included in the description of the above-described configuration, and thus only the entire sequence is summarized. 
     For a method of assembling a switching module using the pressing device  180 , there is provided an assembly method of the switching module, including a plurality of switches  101  and a plurality of cooling plates  104 , and first and second supporting members  125 ,  128  that support the plurality of switches and the plurality of cooling plates, and the method may include arranging a first pressing support portion  161  on the second supporting member (S 01 ), stacking the plurality of switches and the plurality of cooling plates along a vertical direction on the first pressing support portion (S 02 ), arranging a first pressing member  131  and a first supporting member on the uppermost cooling plate among the plurality of cooling plates (S 03 ), supporting the first supporting member and the second supporting member using a plurality of support rods  135  (S 04 ), separating between the first pressing support portion and the second supporting member by pressing the first pressing support portion using a pressing device (S 05 ), and inserting a second pressing support portion between the first pressing support portion and the second supporting member (S 06 ). 
     Here, the pressing device may include a pressure supply portion  181  formed in a pipe shape to supply pressure, and a pressure transmission portion  183  formed in a solid shape and connected to the pressure supply portion to operate by the pressure. 
     Furthermore, said separating between the first pressing support portion and the second supporting member (S 05 ) may include inserting the pressure transmission portion through the second supporting member (S 051 ); allowing the pressure transmission portion to be brought into contact with the first pressing support portion (S 052 ); supplying pressure from the pressure supply portion of the pressing device to the pressure transmission portion (S 053 ); and pressing the first pressing support portion using the pressure from the pressure transmission portion to raise the cooling plate and the switch on the first pressing support portion (S 054 ). 
     Furthermore, said allowing the pressure transmission portion to be brought into contact with the first pressure support portion (S 052 ) may include inserting a protruding portion formed at a front end of the pressure transmission portion into an insertion groove formed at a lower side of the first pressing support portion (S 052 - 1 ). 
     In addition, the second pressing support portion may include a plurality of support plates having different thicknesses, and a number of the support plates may vary according to a spacing distance between the first pressing support portion and the second supporting member. 
     At this time, pressure supplied from the pressure supply portion may be hydraulic pressure. 
     The detailed description thereof should not be construed as restrictive in all aspects but considered as illustrative. The scope of the embodiment should be determined by reasonable interpretation of the appended claims and all changes that come within the equivalent scope of the embodiment are included in the scope of the embodiment.