Operation O
ABNORMAL SIGN:
After closing BLVMT DJ trips within 15.6 seconds
CAUSES:
1. MVRH not working or defective QVRH
2. MVMT-1 not working or defective QVMT-1
3. MVMT-2 not working or defective QVMT-2
Troubleshooting
a) Place HVRH, HVMT-1 and HVMT-2 on 3 position and close DJ, close BLVMT and wait for 15.6 seconds.
b) If DJ trips, wedge relay Q118 in energized condition, normalize HVRH, HVMT-1& HVMT-2 close DJ and resume traction duly observing the precautions for wedging Q118 relay.
c) If DJ holds, check the working of MVRH, MVMT-1 & MVMT-2.
d) If all the 3 blowers are working normal inform TLC, resume traction, and find out the actual trouble whenever time permits.as given below.
e) Open DJ, place HVRH on 1, close DJ, close BLVMT and wait.
f) If DJ trips QVRH is defective, place HVRH on 3 and normalize other switches, work further duly watching the working of MVRH.
g) If DJ holds, open DJ, place HVMT-1 on 1, close DJ, close BLVMT and wait.
h) If DJ trips, QVMT-1 is defective. Place HVMT-1 on 3 and normalize HVMT-2, work further duly watching the working of MVMT-1.
i) If DJ holds, QVMT-1 is normal and the fault is with QVMT-2.Retain HVMT-2 as it is on 3 position and work further duly watching the working of MVMT-2.
j) If MVRH is not working, place HVRH on 0, ensure C107 is fully open. Ensure HPH in 1.
k) Inform TLC, clear section within 5 notches or wedge Q118 with starting current 920A for 5 min and continuous 500A duly checking transformer oil level and colour.
l) If MVMT-1 is not working, place HVMT-1, HVSL 1 and HVSI-1 in 0, ensure C105 is fully open and work onwards with 50% of maximum permissible load with normal current ratings. Inform TLC.
m) If MVMT-2 is not working, place HVMT-2, HVSL-2 and HVSI-2 in 0, ensure C106 is fully open and work onwards with 50% of maximum permissible load with normal current ratings. Inform TLC.
ABNORMAL SIGN:
After closing BLVMT DJ trips within 15.6 seconds
CAUSES:
1. MVRH not working or defective QVRH
2. MVMT-1 not working or defective QVMT-1
3. MVMT-2 not working or defective QVMT-2
Troubleshooting
a) Place HVRH, HVMT-1 and HVMT-2 on 3 position and close DJ, close BLVMT and wait for 15.6 seconds.
b) If DJ trips, wedge relay Q118 in energized condition, normalize HVRH, HVMT-1& HVMT-2 close DJ and resume traction duly observing the precautions for wedging Q118 relay.
c) If DJ holds, check the working of MVRH, MVMT-1 & MVMT-2.
d) If all the 3 blowers are working normal inform TLC, resume traction, and find out the actual trouble whenever time permits.as given below.
e) Open DJ, place HVRH on 1, close DJ, close BLVMT and wait.
f) If DJ trips QVRH is defective, place HVRH on 3 and normalize other switches, work further duly watching the working of MVRH.
g) If DJ holds, open DJ, place HVMT-1 on 1, close DJ, close BLVMT and wait.
h) If DJ trips, QVMT-1 is defective. Place HVMT-1 on 3 and normalize HVMT-2, work further duly watching the working of MVMT-1.
i) If DJ holds, QVMT-1 is normal and the fault is with QVMT-2.Retain HVMT-2 as it is on 3 position and work further duly watching the working of MVMT-2.
j) If MVRH is not working, place HVRH on 0, ensure C107 is fully open. Ensure HPH in 1.
k) Inform TLC, clear section within 5 notches or wedge Q118 with starting current 920A for 5 min and continuous 500A duly checking transformer oil level and colour.
l) If MVMT-1 is not working, place HVMT-1, HVSL 1 and HVSI-1 in 0, ensure C105 is fully open and work onwards with 50% of maximum permissible load with normal current ratings. Inform TLC.
m) If MVMT-2 is not working, place HVMT-2, HVSL-2 and HVSI-2 in 0, ensure C106 is fully open and work onwards with 50% of maximum permissible load with normal current ratings. Inform TLC.
