Patent Description:
Main high-voltage devices in a high-voltage device box for electric locomotives and EMUs include a vacuum circuit breaker, a high-voltage grounding switch, a high-voltage isolation switch, a voltage transformer and a lightning arrester, among which the high-voltage isolation switch is provided with low-voltage components (pneumatic components and DC110V low-voltage circuit components), and the vacuum circuit breaker also includes low-voltage control parts (a driving mechanism, pneumatic components and DC110V low-voltage circuit components). <CIT>, <CIT> and <CIT> disclose high-voltage device boxes for electric locomotives according to the prior art.

At present, the above-mentioned devices are all installed in the high-voltage device box for electric locomotives and EMUs. The arrangement of the devices is based on the principle of facilitating the entry and exit of high-voltage cables, but does not fully consider the inspection and repair requirements of high-voltage switch products with a high fault rate. Therefore, when the high-voltage switch products have faults in the actuating mechanism, low-voltage lines or pneumatic components, the sealed top cover of the high-voltage device box has to be opened first, and the devices are removed from the box before inspection and repair, which is inconvenient for the inspection and repair. In addition, all kinds of high-voltage devices in the existing high-voltage device box are installed on the side wall of the box body, and their insulating performance is ensured by a bottom insulating partition plate. In this installation structure, the volume of the box body is determined by the space occupied by independent high-voltage devices on the side wall. As a result, part of the space of the existing high-voltage device box is idle, and the overall volume and weight of the box body are relatively large, which is not conducive to the load-bearing of the roof installation structure.

The technical problem to be solved by the present invention is to overcome the above defects and provide a high-voltage device box in which devices can be reasonably arranged to facilitate the inspection and repair of the device and reduce the volume of the box body.

The technical solution adopted in the present invention is: a high-voltage device box, including a box body, and a high-voltage grounding switch, a voltage transformer, a lightning arrester, a high-voltage isolation switch and a vacuum circuit breaker located in the box body; the inside of the box body is divided into a low-voltage region and a high-voltage region by means of a partition plate, and a low-voltage portion of the high-voltage isolation switch and a low-voltage portion of the vacuum circuit breaker are both installed in the low-voltage region; the high-voltage grounding switch and a high-voltage portion of the vacuum circuit breaker are both installed on the side of the partition plate facing the high-voltage region, a high-voltage portion of the high-voltage isolation switch is installed on a bottom surface of the high-voltage region by means of a supporting insulator, and the voltage transformer and the lightning arrester are respectively installed on two opposite side walls of the high-voltage region; an inspection and repair cover plate is provided above the low-voltage region, and a main top cover is provided above the high-voltage region.

In the above solution, when a device such as a high-voltage switch fails, only the inspection and repair cover plate in the low-voltage region needs to be opened for inspection and repair, which improves the safety and convenience of the inspection and repair. In addition, this high-voltage device box is designed based on the principle of partition of high- and low-voltage regions and modular installation of functions, that is, each high-voltage device is first functionally divided, for example: the high-voltage isolation switch is divided to insulating modules (high-voltage portion), driving mechanism modules (low-voltage portion), etc., and then each functional module is reasonably installed in the high-voltage device box according to the space utilization of the box body. Therefore, when the devices in the high-voltage device box are installed, the space at the bottom of the box body is also used in addition to the space on the side wall of the box body, that is, the redundant space of the box body is effectively used, which can reduce the volume of the high-voltage device box.

Preferably, the supporting insulator includes an upper insulator and a lower insulator, a bottom insulating partition plate and a middle insulating partition plate are provided in sequence from bottom to top at the bottom of the high-voltage region, and the high-voltage grounding switch is located above the bottom insulating partition plate and is not in contact with the middle insulating partition plate; the upper insulator is located on an upper surface of the middle insulating partition plate, the lower insulator is located on a lower surface of the middle insulating partition plate, and the upper insulator, the middle insulating partition plate and the lower insulator are fixedly connected; and a top insulating partition plate is provided at the top of the high-voltage region.

Due to the reduction in the volume of the high-voltage device box, in order to ensure the insulating performance, the middle insulating partition plate is provided between the devices in the high-voltage region and the bottom of the box body, and the top insulating partition plate is provided between the devices in the high-voltage region and the top of the box body. Considering the insulating performance of the supporting insulator, the supporting insulator is divided into an upper insulator and a lower insulator to avoid perforation on the insulating partition plates. However, because the lower insulator plays a supporting role and its height is limited, the distance between the middle insulating partition plate and the bottom surface of the box body will be greater than the shortest distance between the rotating high-voltage grounding switch and the bottom surface of the box body, which will cause the high-voltage grounding switch to interfere with the middle insulating partition plate during rotation. Therefore, in order to ensure the insulating performance, the middle insulating partition plate is not provided below the high-voltage grounding switch, but the bottom insulating partition plate is provided alone there.

Preferably, the bottom insulating partition plate and the middle insulating partition plate are respectively fixed on the bottom surface of the box body through a first insulating column and a second insulating column, and the top insulating partition plate is fixed on the main top cover of the box body through a third insulating column.

In the above solution, the insulating partition plates are all connected to the box body through insulating columns, which can further ensure its insulating performance.

Preferably, the upper insulator includes an upper insulator upper flange and an upper insulator lower flange, and the lower insulator includes a lower insulator upper flange and a lower insulator lower flange; the upper insulator lower flange, the middle insulating partition plate, and the lower insulator upper flange are connected together by fasteners; and the lower insulator lower flange is fixedly connected to the bottom surface of the box body.

The connection ends of the insulators are set as flange structures, which facilitates the connection between the insulators and other devices.

Preferably, each of the upper insulator lower flange and the lower insulator upper flange is provided with an installation groove, a sealing ring is installed in the installation groove, and the inner ring of the sealing ring is located outside the fastener.

In the above arrangement, after the sealing ring is installed in the installation groove, the fastener can be insulated from the high-voltage device above the middle insulating partition plate to ensure the insulating performance in the box body.

Preferably, a voltage equalizing ring is installed at the upper part of the upper insulator, so as to reduce the electric field intensity at the electric field concentration.

The beneficial effects of the present invention are as follows: the high- and low-voltage regions are partitioned in the box body of the high-voltage device box of the present invention, which is beneficial to the inspection and repair of low-voltage components with high fault rates and improves the inspection and repair safety; after the high- and low-voltage regions are partitioned in the box body of the high-voltage device box, high-voltage devices are divided into high- and low-voltage portions, and a combination of side wall installation and bottom surface installation is used, which can reduce the height space size of the high-voltage device box by at least <NUM>/<NUM> and also reduce the weight of the box by <NUM>/<NUM>; multiple layers of solid insulating partition plates are arranged in the box body, and the insulating partition plates are supported by insulating columns, which ensures the insulating performance between the high-voltage devices and the bottom and top surfaces of the box body; and the supporting insulator composed of an upper insulator and a lower insulator to ensure vertical insulation, and plane sealing is used between the upper insulator and the insulating partition plates to ensure the insulating performance.

The present invention will be further described below with reference to the embodiments and accompanying drawings.

As shown in <FIG>, a high-voltage device box includes a box body <NUM>. The box body <NUM> is a mechanical installation body that contains devices in the box body, and is formed by welding aluminum alloy profiles. The box body <NUM> is provided with high-voltage cables <NUM> for introducing external high voltage. The inside of the box body <NUM> is divided into a high-voltage region and a low-voltage region by means of an aluminum alloy partition plate <NUM>. There are two top covers at the upper part of the box body, including an inspection and repair cover plate <NUM> for the inspection and repair of the low-voltage region, and a main top cover <NUM> for the installation of high-voltage devices. The inspection and repair cover plate <NUM> and the main top cover <NUM> are installed on the box body by fasteners. During inspection and repair, only the inspection and repair cover plate <NUM> is removed, and the main top cover <NUM> is in a sealed state for a long time.

The specific structure in the box body <NUM> includes: a high-voltage grounding switch <NUM>, a voltage transformer <NUM>, a bottom insulating partition plate <NUM>, a middle insulating partition plate <NUM>, a voltage equalizing ring <NUM>, a lightning arrester <NUM>, a high-voltage isolation switch <NUM>, a vacuum circuit breaker <NUM>, an insulating column 13A, an insulating column 13B, a top insulating partition plate <NUM>, an insulating column <NUM>, and a supporting insulator <NUM>. Among the above components, the high-voltage grounding switch <NUM>, the voltage transformer <NUM>, the lightning arrester <NUM>, a high-voltage portion of the high-voltage isolation switch <NUM> and a high-voltage portion of the vacuum circuit breaker <NUM> are all high-voltage devices in the box, and are installed in the high-voltage region of the box body <NUM>. A low-voltage portion <NUM> of the high-voltage isolation switch <NUM> and a low-voltage portion <NUM> of the vacuum circuit breaker <NUM> are installed in the low-voltage region of the box body <NUM>.

The bottom insulating partition plate <NUM> and the middle insulating partition plate <NUM> isolate the air between the high-voltage devices in the high-voltage region and a bottom surface of the box body <NUM>, thereby increasing the electrical clearance and enhancing the insulating performance between the devices in the box. Meanwhile, the top insulating partition plate <NUM> isolates the air path between the high-voltage devices and a top surface of the box body <NUM>, thereby increasing the electrical clearance and enhancing the insulating performance between the components in the box.

The voltage equalizing ring <NUM> is installed above the supporting insulator <NUM> to equalize the electric field of conductive components above the supporting insulator, so as to improve the insulating performance. The supporting insulator <NUM> functions as a supporting insulator for the conductive connection components between various high-voltage devices. The insulating columns 13A and 13B have the same structure, the insulating column <NUM> and the insulating column 13A or 13B are only different in height, and the insulating columns function as supporting insulators for the insulating partition plates. The bottom insulating partition plate <NUM>, the middle insulating partition plate <NUM> and the top insulating partition plate <NUM> all have through holes for installing fasteners <NUM>, the insulating columns 13A, 13B and <NUM> all have threaded holes for installing fasteners, and the fasteners <NUM> (such as screws) fixedly connect the insulating partition plates and the insulating columns together.

In the present invention, the specific structure of the box body <NUM> includes: a partition plate <NUM>, an insulating column installation seat <NUM> for the insulating column 13A, the insulating column 13B and the insulating column <NUM>, a voltage transformer installation seat <NUM>, a supporting insulator installation seat <NUM>, a valve cylinder mechanism installation seat <NUM> for the high-voltage isolation switch, a lightning arrester installation seat <NUM>, a vacuum circuit breaker installation seat <NUM> and a high-voltage grounding switch installation seat <NUM>.

The partition plate <NUM> functions to divide the box body <NUM> into a high-voltage region and a low-voltage region, the valve cylinder mechanism installation seat <NUM> functions to install pneumatic components of the high-voltage isolation switch and a low-voltage control circuit assembly that is a valve cylinder mechanism, and the vacuum circuit breaker installation seat <NUM> functions to install the low-voltage component <NUM> of the vacuum circuit breaker <NUM>; the high-voltage grounding switch <NUM> is installed on the partition plate <NUM> through the high-voltage grounding switch installation seat <NUM>, the supporting insulator <NUM> is installed on the bottom surface of the box body <NUM> through the supporting insulator installation seat <NUM>, the voltage transformer <NUM> and the lightning arrester <NUM> are respectively installed on two opposite side walls of the box body <NUM> through the voltage transformer installation seat <NUM> and the lightning arrester installation seat <NUM>, and the insulating column 13A, the insulating column 13B, and the insulating column <NUM> are installed on the insulating column installation seat <NUM>, where the insulating column installation seat <NUM> on the box body has threaded holes; the insulating column 13A, the insulating column 13B, and the insulating column <NUM> also have threaded holes for installing fasteners, and the bolts <NUM> connect the insulating columns and the box body together.

In the present invention, the high-voltage grounding switch <NUM> includes an installation plate <NUM>, a rotating rod <NUM> and a contact <NUM>, and the high-voltage portion of the vacuum circuit breaker includes an installation base plate <NUM>, a vacuum circuit breaker blade <NUM> and a vacuum circuit breaker insulator <NUM>; the high-voltage grounding switch <NUM> is fixed on the partition plate <NUM> through the installation plate <NUM>. Due to the space limitation in the box, the rotating rod <NUM> and the contact <NUM> of the high-voltage grounding switch will interfere with the middle insulating partition plate <NUM> when rotating to the vacuum circuit breaker blade <NUM>. Therefore, the middle insulating partition plate <NUM> is not provided below the high-voltage grounding switch <NUM>, but the bottom insulating partition plate <NUM> is added in order to ensure the insulating performance.

In this embodiment, the insulating performance of the high-voltage device box is achieved by the above-mentioned insulating partition plates, and each high-voltage device is installed in the high-voltage device box by means of the high- and low-voltage regions, thereby greatly reducing the space size of the high-voltage device box. In this embodiment, when the same high-voltage devices are used, the solution of this embodiment can reduce the height space size of the high-voltage device box by at least <NUM>/<NUM>, and also reduce the weight of the box by <NUM>/<NUM>.

In this embodiment, in order to further enhance the insulating performance, the supporting insulator <NUM> is divided into an upper insulator and a lower insulator; the upper insulator includes an upper insulator upper flange <NUM> and an upper insulator lower flange <NUM>; and the lower insulator includes a lower insulator upper flange <NUM> and a lower insulator lower flange <NUM>. The upper insulator upper flange <NUM> is used to install the conductive connection components of the high-voltage devices, the upper insulator lower flange <NUM> is on the upper surface of the middle insulating partition plate <NUM>, the lower insulator upper flange <NUM> is on the lower surface of the middle insulating partition plate <NUM>, and the upper insulator lower flange <NUM>, the middle insulating partition plate <NUM> and the lower insulator upper flange <NUM> are connected together by fasteners <NUM>; and the lower insulator lower flange <NUM> is fixedly connected to the supporting insulator installation seat <NUM> on the bottom surface of the box body.

The upper insulator lower flange <NUM> is provided with threaded holes, the lower insulator upper flange <NUM> is provided with through holes, and the fasteners <NUM> may be bolts with heads facing down.

Claim 1:
A high-voltage device box, comprising a box body (<NUM>), and a high-voltage grounding switch (<NUM>), a voltage transformer (<NUM>), a lightning arrester (<NUM>), a high-voltage isolation switch (<NUM>) and a vacuum circuit breaker (<NUM>) located in the box body (<NUM>), wherein the inside of the box body (<NUM>) is divided into a low-voltage region and a high-voltage region by means of a partition plate (<NUM>), and a low-voltage portion (<NUM>) of the high-voltage isolation switch and a low-voltage portion (<NUM>) of the vacuum circuit breaker are both installed in the low-voltage region; the high-voltage grounding switch (<NUM>) and a high-voltage portion of the vacuum circuit breaker (<NUM>) are both installed on the side of the partition plate (<NUM>) facing the high-voltage region, a high-voltage portion of the high-voltage isolation switch (<NUM>) is installed on a bottom surface of the high-voltage region by means of a supporting insulator (<NUM>), and the voltage transformer (<NUM>) and the lightning arrester (<NUM>) are respectively installed on two opposite side walls of the high-voltage region; an inspection and repair cover plate (<NUM>) is provided above the low-voltage region, and a main top cover (<NUM>) is provided above the high-voltage region.