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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...shows a three-pole switch used for this purpose. The third or middle clip should be made longer, so that the equalizing connection can be established before the generator is thrown in on the system. An equalizing bus is provided in this diagram, which is the usual practice, where there are a number of machines working together. Another method, which is sometimes used, is to connect the equalizer and also the dynamo lead from the equalizer side of the generator to a double pole switch. This can be thrown in and the dynamo brought up to potential, and a single pole switch can be closed on the open side of the generator to throw the machine in on the system. This method of connection has its advantage: --if there is much distribution drop, and if the generators are overcompounded to take care of it, and a number of machines work together in multiple to supply the full load when this maximum drop occurs, it is evident that when one machine is operated to supply the minimum load, the generator will normally give too high a potential, and hand regulation will be necessary in order to obtain the proper potential; whereas, if the series and compound connection were left in circuit of the idle machines, they would reduce the normal over-compounding of.the active machine as the load on the plant decreased. In this way better regulation can be produced and the over-compounding of the machine is somewhat controlled. This also avoids ever putting in a compound machine in circuit without first equalizing. Another method is to have the voltmeter by which the generators are brought up to potential, not connected across the machine until the equalizer switch is thrown, and in this way avoid putting in the generator without first equalizing. The circuit breaker..
