Checking of current reversal M14947-13 v9The reverse zone timer must not operate before the forward zonefault is applied. The user might need to block the reverse zone timersetting during testing of current reversal.The forward zone timer must be set longer than the tDelayRev setvalue.1. Set the healthy condition to an impedance at 50% of the reach of the reversezone connected to IRV.2. Activate the receive (CRL) signal.3. After the start condition is obtained for reverse zone, apply a fault at 50% ofthe reach of the forward zone connected to WEIBLK2.4. Check that correct trip outputs and external signals are obtained for the typeof fault generated. The operation time should be about the tDelayRev settinglonger than the carrier accelerated trip (TRIP) recorded for the permissiveoverreach scheme communication.5. Restore the forward and reverse zone timer to its original setting.9.9.2.2 Weak end infeed logic M14947-37 v2Weak-end infeed logic at permissive overreach schemes M14947-39 v51. Check the blocking of the echo with the injection of a CRL signal >40msafter a reverse fault is applied.2. Measure the duration of the echoed CS signal by applying a CRL receivesignal.3. Check the trip functions and the voltage level for trip by reducing a phasevoltage and applying a CRL receive signal.Testing conditions M14947-52 v7Only one type of fault is sufficient, with the current reversal and weak-end infeedlogic for distance protection function ZCRWPSCH. Apply three faults (one in eachphase). For phase L1-N fault, set these parameters:Table 18:Phase L1-N parameter valuesPhase I (Amps) Phase-angle (Deg) V (Volts) Phase-angle (Deg)L1 0 0 Set less thanUPN< 0L2 0 240 63 240L3 0 120 63 1201MRK 506 383-UEN A Section 9Testing functionality by secondary injectionLine distance protection REL650 2.2 IEC 151Commissioning manual
