Patent GB-191202630-A (GB)
Title: Means for and Methods of Charging and Discharging Electric Accumulators or Secondary Batteries.
Inventor: TAYLOR ALFRED MILLS
IPC: H02J7/00
Filed: 1912-02-01
Granted: 1913-02-03
Abstract: 2630. Taylor, A. M. Feb. 1. [Cognate Application, 12,834/12.] Boosting.-In a threewire battery - charging system, four or six reversible boosters are employed, and switching arrangements are provided for connecting the boosters either in series or parallel, and for connecting them in groups in series or parallel. Switches and d static balances are also provided which ensure a connexion for the e neutral wire under the various conditions of running; and, when six boosters are employed, they may be connected either (i) all in parallel, (ii) all in series, (iii) two sets of three in series, the sets being in parallel, or (iv) two sets in series, the units of which arc in parallel. In the arrangement shown in Fig. 1, two boosters A, -B provided with static balances a, b are adapted to be connected in series or parallel between the booster busbars R. S by means of a switch G; and two boosters C, D provided with static balances e, d are similarly arranged between the booster busbars T, u. A switch K arranged between the booster bus - bars is adapted to connect the booster groups either in series or parallel. The neutral points of the balances a, b are adapted to he connected to the neutral wire M by means of the switch P, and the static balances c, d are similarly connected to the wire M by means of a switch Q. When the switch K is in its upper position, the boosters between the bus-bars R, S ; T, u are in parallel, and the switches P, Q should then be closed to obtain a connexion for the neutral wire M. If, however, the boosters between the bus-bars are connected in series across the mains L, N by placing the switch K in its lower position, the neutral wire M is correctly connected by means of the lead m. In the modification shown in Fig. 2, the series-parallel controlling-switch G for the boosters A, B is mechanically coupled to the switch W, the series-parallel controlling-switch H to the switch X, and the series-parallel controlling-switch K to the switch V. When the switches G. H are in their lower positions and the switch K in its upper position, the boosters A 13 are in series and the boosters C, D in series, while the two pairs of boosters A, B, C, D are in parallel across the mains L, N. With these connexions, the points between the boosters A, B, C, D are connected to the neutral wire M through the lower contacts of switches W, X and the switch V. When the switches G, H are moved to their upper positions and the switch K is moved to its lower position, the boosters A, B and C, D are respectively in parallel, and the two pairs are in series across the mains L, N; the connexion of the neutral wire M being made between the lower contacts of the switch K. If, however, the switch K is moved to its upper position, all the boosters are connected in parallel across the mains L, N, and the neutral wire M is connected to the middle points of the static transformers through the upper contacts of the switches W, X and the switch V. In the arrangement shown in Fig. 3, three boosters A, B1, B2 are arranged on one side of the system, and three boosters C. D1, D2 on the other side, and additional switches G2, H2 are provided. When the switches G1, G2, H1, H2, W, X, K, V are in their upper positions, the booster armatures A, B1, B2, C, D1, D2 are all in parallel across the mains L, N, and their neutral points are connected to the neutral wire M. When the switches are placed in their lower positions, the booster armatures are all in series with the neutral points of the armatures B1, D1 connected to the neutral wire M. To connect the booster armatures on each side in series and the two sets in parallel across the mains L, N, the switches are placed in the positions shown; and to connect the booster armatures on each side in parallel, the switches G1, G2, H1, H2, W, K are all placed in their upper positions and the switches K, V in their lower positions.