ABB REU 610 Technical Reference Manual

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ABB REU 610 Technical Reference Manual Manual pdf 48 page image

Table 5.1.4.8.-3 Residual overvoltage protection, elements 59N-1 and59N-2 (Continued)Feature Element 59N-1 Element 59N-2Retardation time, typical 30 ms 30 msSet resetting time, 59N-1 RESET 0.07...60.0 s 100 msDrop-off/pick-up ratio, typical 0.96 0.96Operate time accuracy:-at definite-time characteristic ±2% of the setoperate time or ±25ms±2% of the setoperate time or ±25msOperation accuracy ±1.5% of the setpickup value or±0.05% U n (VT)±1.5% of the setpickup value or±0.05% U n (VT)a) Resetting time of the trip signal.Table 5.1.4.8.-4 CBFAILFeature ValueSet operate time 0.10...60.0 sPhase-to-phase voltage threshold forexternal triggering of the CBFAIL:-pick-up/drop-off 0.15/0.10 × Un (VT)5.1.5. Trip-circuit supervisionThe trip-circuit supervision (TCS) detects open circuits, both when the circuitbreaker is open and closed, and trip-circuit supply failure.The trip-circuit supervision is based on a constant current injection principle:by applying operating voltage for the circuit breaker, a constant current isforced to flow through the external trip circuit. If the resistance of the tripcircuit exceeds a certain limit, due to oxidation or a bad contact, for instance,the trip-circuit supervision is activated and a warning appears on the LCDtogether with a fault code. The warning signal from the trip-circuitsupervision can also be routed to SO2 by setting switch SGF1/8 to 1.Under normal operating conditions, the applied external voltage is dividedbetween the relay’s internal circuit and the external trip circuit so that at least20 V remains over the relay’s internal circuit. If the external trip circuit’sresistance is too high or the internal circuit’s too low, due to welded relaycontacts, for instance, the voltage over the relay’s internal circuit falls below20 V (15...20 V), which activates the trip-circuit supervision.The operation condition is:48REU 610 Voltage RelayTechnical Reference Manual - ANSI Version1MRS755972