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Extra resources for IEEE Std 666-1991, IEEE Design Guide for Electric Power Service Systems for Generating Stations

Sample text

During the reacceleration time after bus reconnection, all motors may be drawing close to locked rotor current and depressing the motor terminal voltages below motor nameplate requirements. In some cases, it may be required to load shed selected motors to ensure that total motor reacceleration requirements are not excessive. , opening of starter and relay contacts). This scheme is advantageous for undervoltage conditions on the normal bus caused by generator or turbine trips. If the undervoltage affected the alternative source, normal voltage should be restored by the time transfer is made.

13-1977 (R 1989), American National Standard for Rotating Electrical Machinery Ñ Cylindrical Rotor Synchronous Generators. 00-1987, IEEE Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers (ANSI). [B4] IEEE Std 100-1988, IEEE Standard Dictionary of Electrical and Electronics Terms (ANSI). [B5] IEEE Std 141-1986, IEEE Recommended Practice for Electric Power Distribution for Industrial Plants (ANSI). [B6] IEEE Standard 505-1977, IEEE Standard Nomenclature for Generating Station Electric Power Systems (ANSI).

A disadvantage is that the transfer time could exceed the safe Òdead-busÓ period of approximately 9 to 10 c. The delay times included in the relay protection design should be reviewed to ensure their adequacy for the transfer scheme selected. 1. The transfer is automatically initiated by the generator lock-out relay that closes the alternative source breaker, momentarily paralleling the alternative and normal source. An auxiliary ÒaÓ contact on this closed breaker will then trip the normal source breaker.

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