1. Optimal planning of series resistor to control time constant of test circuit for high-voltage AC circuit-breakers.
- Author
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Kim, Yoon-Ho, Ryu, Jung-Hyeon, Kim, Jin-Hwan, and Kim, Kern-Joong
- Subjects
ELECTRIC resistors ,ALTERNATING current circuits ,ELECTRIC circuit breakers ,SHORT-circuit currents ,ELECTRIC potential ,HEAT capacity - Abstract
The equivalent test circuit that can deliver both short-circuit current and recovery voltage is used to verify the performance of high-voltage circuit breakers. Most of the parameters in this circuit can be obtained by using a simple calculation or a simulation program. The ratings of the circuit breaker include rated short-circuit breaking current, rated short-circuit making current, rated operating sequence of the circuit breaker and rated short-time current. Among these ratings, the short-circuit making capacity of the circuit breaker is expressed in peak value and not in RMS value similar to breaking capacity. A series resistor or super-excitation is used to control the peak value of the short-circuit current in the equivalent test circuit. When using a series resistor, a higher rating of circuit breakers leads to a higher thermal capacity, thereby requiring additional space. Therefore, an effective, optimal design of the series resistor is essential. This paper proposes a method for reducing thermal capacity and selecting the optimal resistance to limit the making current by controlling the DC time constant of the test circuit. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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