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HomeNewsCurrent transformer calibration method

Current transformer calibration method

2023-01-15
Current Transformer calibration method

Before conducting current transformer error tests,tests such as polarity and demagnetization are usually required.
Current Transformer
1,polarity check

The current transformer primary winding marks are P1 and P2,and the secondary winding marks are S1 and S2.If P1 and S1 are the same name,then this flag is called polarity reduction.The primary current flows from P1 and the secondary current flows from S1.The polarity check is very simple.In addition to checking on the transformer calibrator,DC test can also be used.

2,demagnetization check

In the case of a sudden drop in current of the current transformer,the transformer core may generate residual magnetism.For example,the current transformer suddenly cuts off the power supply under a large current condition,and the secondary winding suddenly opens.The transformer core has residual magnetism,which reduces the magnetic permeability of the core and affects the performance of the transformer.The transformers after long-term use should be demagnetized.The transformer should also be demagnetized before inspection.

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