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    • 30. 发明专利
    • POWER CAPACITOR PROTECTING DEVICE
    • JPH0346719A
    • 1991-02-28
    • JP17914289
    • 1989-07-13
    • TOSHIBA CORP
    • SHIBUYA TOYOJIRO
    • H01H7/16
    • PURPOSE:To prevent a wrong trip by connecting two auxiliary relays to be operated with the closing signal with time limits different from each other to an operating circuit of a leased breaker. CONSTITUTION:In the case that an A power capacitor bank leased breaker 52AC is operated for input during the stop of a B power capacitor leased breaker 52BC, when an operating switch 3-52AC of the breaker 52AC is operated for input, a holding relay 52ACX is excited to turn ON a usually open contact 52ACX-a. A time limit relay 52ACXT1 is thereby operated with a time limit to close the breaker 52AC, and the current flowing to the breaker 52AC becomes maximum at the initial time, and thereafter, it is reduced to be the mean rated current. At this stage, even if the current becomes maximum, an induction disc element 51AC-INDU of an overcurrent relay 51AC does not reach the operating condition, and even if a holding relay 52BCX-b connected to the element 51AC-INDU is turned ON, the breaker 52AC does not trip. But, an instantaneous element 51AC-INST is operated in response to the accident detecting current. A wrong trip can be thus prevented.