3.3 KV Vacuum Pump motors Tripping
3.3 KV Vacuum Pump motors Tripping
(OP)
Dear All
I am working in Pulp and Paper Mill where we have vacuum system comprising 3.3 KV vacuum pump- motor combination. These are tripping frequently with IE>> fault(Earth Fault). Kindly help if there is any CT fault.
I am working in Pulp and Paper Mill where we have vacuum system comprising 3.3 KV vacuum pump- motor combination. These are tripping frequently with IE>> fault(Earth Fault). Kindly help if there is any CT fault.






RE: 3.3 KV Vacuum Pump motors Tripping
2> Your trip settings are too sensitive.
3> All of the above.
Bill
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"Why not the best?"
Jimmy Carter
RE: 3.3 KV Vacuum Pump motors Tripping
2. Check Cable healthiness
3. Check Relay healthiness.
Is there ane VFD for those motors
RE: 3.3 KV Vacuum Pump motors Tripping
Please send us ( or explain) what is CT connection to protective relay-core balance, residual connection
Please attach setting of IE>> too.
And..of course check primary ( what Bill ans zaza123 wrote), is possible a real fault.
Good Luck.
Slava
RE: 3.3 KV Vacuum Pump motors Tripping
If the protection is connected to core balance CT, many a time the trip problem is due to the incorrect way the power cable armour is taken through the core balance CT.
Correct method is the armour that passes through the CBCT should be returned through the CBCT before connecting to earth flat.
Please post feedback once you solve the problem.
RE: 3.3 KV Vacuum Pump motors Tripping
P.S I assume you have checked entire circuit for health. What protection system are you susing? IQ, MM, Allenwast???
RE: 3.3 KV Vacuum Pump motors Tripping
Now the situation is under control. We have changed the Earth settings also the new CTs have been ordered. They will reach our mill in 1 months time. I am working in Bulleh Shah Paper Mill Kasur Pakistan. They have their one mill at Lahore Pakistan named Packages Limited Lahore.
RE: 3.3 KV Vacuum Pump motors Tripping
Abrar Ahmad
Did you found out any reason why it was tripping.At present the motor is running or r u waiting for CT
RE: 3.3 KV Vacuum Pump motors Tripping
Yes Our Senior Person helped us and we found that CTs were not Ok. So we used the CT of another HT motor. While its CTs were placed on order.Vacuum Pump is now running while the other HT motor is stopped due to process people does'nt need that motor in their process and they will run the other jobs on paper machine.
RE: 3.3 KV Vacuum Pump motors Tripping
rmw