Current transformers commonly have the following three abnormal conditions:
(1) Overheating of the current transformer may be caused by loose internal or external connections, primary overload, or secondary open circuit;
(2) Abnormal noise from the transformer may be due to loose core or components, improper electric field shielding,During the test of the transformer comprehensive tester, only the test voltage/current value needs to be set, and the device can automatically boost voltage/current, and quickly display the volt-ampere characteristic curve or transformation ratio, polarity and other test results of the transformer. Secondary open circuit or potential floating, end screen open circuit and insulation damage discharge;
(3) Abnormal results from dissolved gas analysis of insulating oil should be judged and tracked according to GB/T7252. If only the hydrogen content exceeds the standard, with no obvious increasing trend, and other components are normal, it can be judged as normal.
