DJ TRIPPING THROUGH SAFETY RELAYS
QLM:
QLM is an over current relay provided in the feeding circuit to protect the main transformer from over load. If it trips, it indicates that there is a serious fault either in the main transformer or in the equipment connected to it such as GR, CGRs, RGR, transformer bushings and terminals etc. It is set at 325 amps for WAM4, WAP1 & WAG5A while it is 450Amps in WAG7 &.WAP4 Locos.
2.2. QLM alone acted with LOCKED indication
Action to be taken
a) Check the HT-2 compartment for any smoke, burning smell, fire and any presence of oil in oil trap chamber, oil splashes from GR safety valve or TFR explosion vent underneath of the locomotive through vent pipe.
b) Check the TFR and GR oil level for any abnormal increase.
c) Check roof bushing bars, TFR terminals A33, CGR-1, CGR-2, CGR-3 arc chutes, RGR, RPGR, & A34 bushings, and ETTFP-1/2 & CAPTFP panel for any abnormality.
d) If there is no abnormality, reset the QLM target in clockwise direction once and resume traction.
e) If there is any abnormality or QLM acts second time, DO NOT reset the relay target contact TLC make clear remark in log book.
QLM:
QLM is an over current relay provided in the feeding circuit to protect the main transformer from over load. If it trips, it indicates that there is a serious fault either in the main transformer or in the equipment connected to it such as GR, CGRs, RGR, transformer bushings and terminals etc. It is set at 325 amps for WAM4, WAP1 & WAG5A while it is 450Amps in WAG7 &.WAP4 Locos.
2.2. QLM alone acted with LOCKED indication
Action to be taken
a) Check the HT-2 compartment for any smoke, burning smell, fire and any presence of oil in oil trap chamber, oil splashes from GR safety valve or TFR explosion vent underneath of the locomotive through vent pipe.
b) Check the TFR and GR oil level for any abnormal increase.
c) Check roof bushing bars, TFR terminals A33, CGR-1, CGR-2, CGR-3 arc chutes, RGR, RPGR, & A34 bushings, and ETTFP-1/2 & CAPTFP panel for any abnormality.
d) If there is no abnormality, reset the QLM target in clockwise direction once and resume traction.
e) If there is any abnormality or QLM acts second time, DO NOT reset the relay target contact TLC make clear remark in log book.
