. Electrolysis and its mitigation. . bus bars. If thelatter, an induction generator would be preferred. With thisarrangement the speed would be held substantially constant, andhence the counter emf of the series motor would be proportionalto the current, which condition would be necessary for maintainingthe proper balance between the two feeder systems. Such a sys-tem is shown diagrammatically in Fig. 38. A little considerationwill show that when such an inverted booster is used in lieu of a no Technologic Papers of the Bureau of Standards resistance tap, instead of the energy being dissipated
. Electrolysis and its mitigation. . bus bars. If thelatter, an induction generator would be preferred. With thisarrangement the speed would be held substantially constant, andhence the counter emf of the series motor would be proportionalto the current, which condition would be necessary for maintainingthe proper balance between the two feeder systems. Such a sys-tem is shown diagrammatically in Fig. 38. A little considerationwill show that when such an inverted booster is used in lieu of a no Technologic Papers of the Bureau of Standards resistance tap, instead of the energy being dissipated in the re-sistance tap the excess energy over that required to supply thebooster losses is delivered back to the D. C. or A. C. bus barsthrough the generator driven by the series motor. It is evident that the operating characteristics obtained fromthese two booster systems will in general be substantially thesame. The choice between them will therefore depend mainly onthe relative load in the two parts of the system. It is evident. Fig. 37.—Direct booster system that if the greater part of the load is on the long feeder, the use ofa direct booster in this feeder would require a larger and moreexpensive machine as well as greater power losses in the machineitself than if the inverted booster were used in series with therelatively small load in the local network. Hence, if the load inthe local network is the smaller an inverted booster would becheaper, while if the greater part of the load originates in the local Electrolysis Mitigation in system a direct booster in the long feeder would be indicated. Inthe majority of cases, however, the insulated feeder system withoutboosters as described in the preceding section is found to be ascheap or cheaper than either of the booster systems, and is gen-erally to be preferred because of its greater simplicity. Positive JBus
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