Patent GB-419224-A (GB)
Title: Improvements in synchronishing arrangements for sectionalised busbar systems
IPC: H02J3/42
Filed: 1933-05-22
Abstract: 419,224. Synchronizing. ADAMSON, M. W., 117, Wilderspool Causeway, Warrington, Lancashire, and ASSOCIATED ELECTRICAL INDUSTRIES, Ltd., Crown House, Aldwych, London. May 22, 1933, No. 14771. [Class 38 (iv).] Each of a number of sectionalized bus-bars B, 1B, 3B, 5B, with which lines F1-F6, may be synchronized, is provided with a pair of synchronizing bus-bars SB,. 1SB, 3SB, 5SB and selector relays R, R1, R3, R5 by which one only of these bus-bars can be connected at a time to a pair of auxiliary synchronizing busbars ASB and to a synchroscope S. The arrangement is such that the " running " line or bus-bar is connected to the " running " coil RC of the synchroscope and the incoming line is connected, prior to closure of its main paralleling circuit breaker CB1, CB2 &c., to the " incoming " coil 1c of the synchroscope and at the same time energizes the coil of the corresponding relay R, R1, &c. Each line is connected to the bus-bars B &c. through a selector switch S1-S6 and a circuit breaker CB1-CB6, and, depending upon the position of the switch S1 &c., energizes one conductor of the corresponding synchronizing bus-bar SB, 1SB &c. through a transformer T1 plug switches RS1, IS1, an selector contacts AS1 associated with the main selector switch S1 &c. The plug switches IS1, IS2, &c. are of different size from the switches RS1, RS2 &c. and only one plug of each size is provided so that only one selector relay R, R1 &c. and therefore only two lines can be connected to the synchroscope at the same time. In series with each switch RS1 &c. is a switch ACB1 &c. coupled with the corresponding circuit-breaker CB1 &c. so that the " running switch RS1 &c. is effective to couple the line F1 &c. to the " running " coil Rc of the synchroscope only after the line has been coupled to a bus-bar. Assuming the operation is to connect line F1 to line F2 through bus-bar 1B, switch S is closed to its right-hand contact and circuit breaker CB1 is closed, line F1 is now the " running line and, when the plug is inserted in switch RS1 the transformer T1 is connected through switches RS1 and AS1 to the upper line of the synchronizing bus 1SB. Switch S2 is now closed to the right, and the second plug is inserted in the switch IS2, transformer T2 of the " incoming line F2 being now connected through switch AS2 to the lower line of the synchronizing bus 1SB, relay R1 is thereby energized and the upper and lower conductors of bus 1SB are connected to those of the auxiliary synchronizing bus ASB and to the " running " and " incoming " coils respectively of the synchroscope so that synchronism may be indicated before circuit breaker CB2 is closed. Coupling switches may be provided whereby two or more bus-bar sections may be coupled to function as a single section, in which case the selector relays of all the coupled sections operate when one of them does. In the system shown each of the bus sections 1B, 3B, 5B has two associated lines F1 &c. and a common bus section B is provided for all the lines. The synchroscope may be of any type e.g. electromagnetic, or cathode ray.