Open current transformer inspection
The error test of the open current transformer is generally compared with the standard transformer with the measured transformer. The secondary current difference between the two transformers is the measured transformer error. This method of inspection is called the comparison method. The standard transformer requires two levels higher than the measured transformer, and the standard transformer error is negligible. If the standard transformer is only one level higher than the transformer under test, the error of the test result should be considered plus the standard transformer error.
The secondary current difference between the measured transformer and the standard transformer is generally measured by a transformer calibrator. Since the transformer calibrator measures the ratio of the current difference between the measured transformer and the standard transformer to the secondary current, the requirements for the transformer calibrator are not high. The level of transformer to be verified is basically determined by the standard transformer.
Standard transformers are the key to the transformer calibration system. The transformer to be tested is verified. In addition to the standard transformer and transformer calibrator, there is also a current booster that supplies primary current to the transformer, a regulator that can regulate the current of the current regulator, and the load.