Study for the performance of high speed switchgear for protection of in-house generation system
- Shikoku Research Inst., Inc., Takamatsu (Japan)
- Meidensha Corp., Tokyo (Japan)
Recently, in large industrial plants and factories, it becomes popular to use In-House generation system connected to utility power system. However, even if consumer has in-house generation system connected to utility power system, when a fault occurs on the transmission line due to lightning etc., voltage at internal power system drops instantaneously until its clearance. This instantaneous voltage drop affects loads supplied by in-house power system. To enhance the load`s reliability, the new switchgear system have been developed. This equipment consists of static switchgear applying thyristor, disconnecting switches, and control circuit. This control circuit has functions to detect voltage drops and voltage synchronization. This equipment is installed in series with the circuit breaker which is connecting the buses of consumer`s own power generation system, and executes high speed tripping and reclosing when the voltage on the consumer`s bus drops instantaneously. In this paper, first, artificial test results of this equipment is represented. From these results, it is confirmed that this equipment can restrain voltage drop of the important loads within one cycle by means of tripping the short circuit current within one cycle when the voltage drops under the setting value. Then, comparison between measured results and simulated results by EMTP is represented. From this comparison, it was confirmed that verification of this equipment`s performance using EMTP is effective. Then, influence of voltage drop (20% and 50%) on loads is investigated by simulating transient voltage change of the generator. As a result, it is confirmed that almost every load equipment is affected by voltage drop when the conventional circuit breaker is used, but is not affected when the high speed switchgear is used, in the case of the voltage drop 50%.
- OSTI ID:
- 277502
- Report Number(s):
- CONF-960509-; ISBN 0-7803-3263-6; TRN: IM9637%%11
- Resource Relation:
- Conference: IEEE/IAS industrial and commercial power systems technical conference, New Orleans, LA (United States), 6-10 May 1996; Other Information: PBD: 1995; Related Information: Is Part Of 1996 IEEE industrial and commercial power systems technical conference: Conference record; PB: 187 p.
- Country of Publication:
- United States
- Language:
- English
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