RELAY PROTECTION METHOD AND APPARATUS AGAINST LC PARALLEL CIRCUIT DETUNING FAULTS

A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current...

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Bibliographische Detailangaben
Hauptverfasser: Chen Jun, Yan Wei, Zhong Shouping, Xu Baoli, Zhang Jie, Zhang Qixue, Ji Yaoyao, Li Huazhong, Wang Guang
Format: Patent
Sprache:eng
Schlagworte:
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Beschreibung
Zusammenfassung:A relay protection method against LC parallel circuit detuning faults comprises the steps of: a relay protection device samples a current of a parallel LC, that is, a reactor and a capacitor, and samples a total current flowing through the whole LC; convert the current of the reactor into a current of an equivalent capacitor; calculate amplitudes of the current of the equivalent capacitor and a current of a realistic capacitor and calculate an amplitude of the total current flowing through the LC; calculate a current amplitude ratio of the equivalent capacitor to the realistic capacitor; and when the amplitude of the total current flowing through the LC is large enough, send an alarm signal or a trip after a setting time delay if the current ratio exceeds a preset upper and lower limit range. Also provided is a corresponding relay protection device.