P12x/EN T/Eb6 - Schneider - error

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P12x/EN AP/Eb6Page 28/78Application GuideMiCOM P120/P121/P122/P1239. REMOTE PROTECTION STAND-BY DIAGRAMMiCOM P121, P122 and P123 relays can be used as a HV distance back-up protection(Figure 9). Depending on the type of selectivity required, 51/51N function of P121, P122 andP123 needs to be set either as time constant or as time dependent. The value of the timedelay of I>/Ie> is set to a value that is compatible with thresholds Z2 or Z3 (2nd and 3rddistance protection zone).BusbarCircuit BreakerDistance protection21P 12150/51FeederP0028ENaFIGURE 9: ASSISTANCE OF REMOTE PROTECTION BY A MiCOM P121 PROTECTIONThe «Equipment default » contact of the distance protection (case of a numerical protection)can be wired to a MiCOM P121, P122 and P123 relays to optimise the time to trip.
Application GuideP12x/EN AP/Eb6MiCOM P120/P121/P122/P123 Page 29/7810. 1 ½ BREAKER SCHEMEFor HV/EHV stations with a 1 ½ circuit breaker scheme (Figure 10), the zone between thetwo circuit breakers and the switch section needs to be protected with a standard ANSI 50protection.The time to trip is an essential criteria to be considered when choosing this protection.MiCOM P121, P122 or P123 relays are perfectly suited for this application. The time delay ofthe first threshold (tI>) is set to a low value (typically 100 ms above the circuit breaker failuretime). This will allow the relay to be blocked by the close contact of the associated switch.BusbarCircuitBreakerCircuit BreakerP12150/51CircuitBreakerCTCTBusbarContactorFeederP0029ENaFIGURE 10: 1 ½ BREAKER SCHEME
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MiCOMP120/P121/P122/P123Overcurrent
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IntroductionP12x/EN IT/Eb6MiCOM P12
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P12x/EN T/Eb6 - Schneider - error

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