How to judge and deal with these abnormal phenomena of the transformer?
Overload:-
When the transformer in operation is overloaded, the ammeter indication may exceed the stable value, and the signal and alarm may be activated. The operating personnel should handle it according to the following principles:
① Check whether the current on each side exceeds the specified value and report to the on-duty attendant.
② Check whether the oil level and oil temperature of the transformer are normal, and put all the coolers into operation.
③ Adjust the operation mode in time. If there is a spare transformer, it should be put into operation.
④ Contact the dispatcher to adjust the load distribution in time.
⑤ If it is a normal overload, the allowable operation time can be determined according to the multiple of the overload, and the oil level and oil temperature should be monitored more closely. It must not exceed the allowable value. If it exceeds the time, the load should be reduced immediately.
⑥ If it is an accidental overload, the allowable multiple and time of the overload should be implemented according to the manufacturer’s regulations. If the overload multiple and time exceed the allowable value, the transformer should also be reduced in accordance with the regulations.
⑦ Conduct a comprehensive inspection of the transformer and its related systems. If any abnormality is found, it should be reported and handled.
Cooling system failure :–
When the transformer cooling system (referring to the submersible oil pump and cooling water system) fails and the transformer sends a cooler standby start-up and cooler full stop signal, the following procedures should be followed:-
1. Check immediately whether the standby cooler has been put into operation.
2. Check the cause of the power outage immediately and restore the normal operation of the cooling device as soon as possible.
3. Strengthen the monitoring of the upper oil temperature and oil level of the transformer, especially during the full stop time of the cooling device.
4. If the cooling system cannot be restored for a while, apply to reduce the load or apply for the transformer to be out of operation to prevent the transformer from operating for more than the specified no cooling time, causing overheating and damage.
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