Patent GB-365669-A (GB)
Title: Improvements relating to apparatus for use in the voltage control of electric transformers
IPC: H01F29/04
Filed: 1930-10-30
Abstract: 365,669. Regulating switches. ELECTRICAL APPARATUS CO., Ltd. and BARBOUR, R. H., Vauxhall Works, South Lambeth Road, London. Oct. 30, 1930, No. 32660. [Class 38 (v).] In a voltage regulation arrangement having an induction regulator combined with a tapped transformer, the moving member of the regulator is coupled by a crank and connecting-rod to a driving member connected to switch gear so that, by rotation of the driving member, switching operations are effected when the regulator is moving at its slowest rate. Figs. 1, 2, and 3 illustrate the steps necessary in changing from one tapping to the next. Fig. 1 shows the transformer and induction regulator with connections made to tapping 7. The first switching operation as shown in Fig. 2 effects disconnection of the end c of the regulator, secondary s from the tapping 7 and connection of the end a to the tapping 6. The regulator is then moved through an angle of 90‹ so that the potential of the point c becomes equal to that of the tapping 6. A further switching operation then takes place as shown in Fig. 3, the point c is connected to the tapping 6 and the end b is disconnected from the tapping 7. In the construction shown in Fig. 5 for a three-phase transformer, induction regulators I<1> I<2> are connected by cranks and linkage to a spindle A coupled to operating gear D. Each phase is provided with a switch K<1> consisting of two pillars 35, 36 provided with contacts 33, 31, 34, 25, 29, 26, 30 connected to the tappings 1 .. 7 and contacts'32, 27, 28 connected to the regulator, and a rotating element 43 provided with contact elements. The switches are operated from the spindle A through a Maltese cross mechanism consisting of a slotted disc 17 on a spindle M connected to the switch spindles through cranks and links, and a cam 15 on the spindle A having pins 16 that engage the slots in the disc 17. The cam 15 has a contour that engages another cam on the spindle M so as to prevent rotation of M during periods in between switching operations. A complete revolution of the spindle A effects a complete change from one tap to the next. In a modification shown in Fig. 7, the Maltese cross mechanism is dispensed with. The switches are mounted on a spindle 43 driven from an operating spindle A and the regulators are mounted on a spindle 11 and rocked by means of a crank from the spindle 43. A lead screw N traverses the spindle 43. A bar 35 carries contacts f<1> .. f9 connected to the transformer tappings and a contact f connected to the free end of the regulator secondary. A bar 36 carries fingers fp1, fp2 connected respectively to the ends a, b of the primary of the regulator. The rotor carries helical contact segments 48, 49 from which project respectively fingers 48a, 49a. In the position shown connection is made to the first tapping. Since one of the contacts fP2 is in engagement with the segment 49, rotation of the spindle 43 will effect the switching operation shown in Fig. 2. The segment 49 will engage contact f<2> and connect it to the end b of the regulator and the finger 48a will disengage from the contact f<8> thus disconnecting the end c of the secondary of the regulator from tapping 1. During this switching operation practically no movement of the regulator takes place. Further rotation of the shaft 43 moves the regulator through 90‹. A second switching operation takes place to effect the connections shown in Fig. 3. The finger 49a engages the contact f
 to connect the second tapping to the end c of the regulator. The segment 48 disengages from contact 1 to disconnect the end b of the regulator from the tapping 1. Specifications 330,192, [Class 38 (iv), Electric supply and transmission systems &c.], 330,819, [Class 38 (ii), Electric currents, Converting &c.], and 341,828, [Group XXXV], are referred to.