Patent GB-586326-A (GB)
Title: Improvements in or relating to electrical synchronising apparatus
IPC: H02J3/42
Filed: 1944-07-14
Abstract: 586,326. Electricity supply. REYROLLE & CO., Ltd., A., DALEY, J., and BROWN, A. J. July 14, 1944, No. 13507. [Class 38 (iv)] Synchronizing.-In a bus-bar system, synchronising apparatus comprises auxiliary switches associated with main switches or circuit breakers of circuits or bus-bar sections to be synchronised and which control the connections of voltage transformer secondaries, each associated with one of such circuits, to an auxiliary circuit or circuits to which are connected, through suitable coupling devices, the synchronising instruments.. The arrangement is such that the " running " voltage is always derived from the voltage transformer of an adjacent circuit already in service. In a duplicate bus-bar arrangement, Fig. 1, comprising main circuit breakers E1, E3, bus-bar coupling circuit breaker C and bus-bar sectionalising circuitbreaker B3, auxiliary circuits A4 and B4, associated respectively with bus-bars A and B comprise pairs of members A5, A6 and B5, B6 connected to pairs of auxiliary switches associated with each circuit breaker and which, in the case of main circuit breakers E1, E3 controlling external circuits D1, D3, are also connected to pairs of auxiliary switches F5, F6, associated with selector switches F1, F3 controlling the connection of the said external circuits alternatively to bus-bars A or B. An auxiliary switch E4, associated with each main circuit breaker controls the connection of a phase G5 of voltage transformers G1, G3, to a "running volts " lead F4 which is connected between each pair of auxiliary switches F5, F6 and a " running volts " bus-wire K through pole H2 of a coupling socket. The phase G5 of each transformer is also connected through pole H1 of the socket to an " incoming volts " bus-wire J. With circuit breaker B3 closed and main circuit breakers E, E3 open, both auxiliary circuits A4, B4 form closed circuits, irrespective of the position of selector switches F1, F3. With circuit breaker_ B3 open, auxiliary circuit B4 comprises two closed circuits each associated with corresponding sections B1, B2 of bus-bar B. Closure of one main circuit breaker on to say, bus-bar A, opens a gap in auxiliary circuit A4, thus connecting the corresponding running volts " lead F4 only to that member A5 of the circuit A4 terminating at the corresponding circuit breaker. Lead F4 is also connected to the associated transformer G1, G2 or G3 through the now closed switch E4, to effect application of running volts to the member A5 of circuit A4 terminating at the closed circuit breaker. Auxiliary circuit B4 remains unaffected. If it is desired to parallel an additional external circuit on to the same bus-bar, plug H is inserted into a socketassociated with the incoming circuit D1, D2, or D3, so that the " incoming volts " will be applied to bus-wire J through the now bridged pole H1 of the socket. At the same time, "running volts," derived from transformer G1, G2, or G3, associated with member A5 integral with member A6 terminating at the circuit breaker of the incoming circuit, is applied to bus-wire K through the now bridged pole H2 of the socket. Closure of switch L4 connects bus-wires J and K to instruments on synchronising panel L. Similar conditions apply, for paralleling external circuits on to bus-bar B, paralleling sections B1 and B2 of bar B together, or paralleling bars A and B together. In each case the "running voltage " is derived from the voltage transformer associated with the next external circuit which happens to be connected to the bus-bar or section to which the incoming circuit is to be paralleled. Arrangements are described for single bus-bar, ring bus-bar and mesh circuit-breaker layouts. Means for selective connection of synchronising instruments to either side of an incoming circuit and means for transposing the " incoming " and " running " voltage connections on either side of auxiliary switches associated with bus-bar section, or coupling circuit breakers are also described.