By conventional meter calibration of AC current transformers and voltage Taichung transformer test

By conventional meter calibration of AC current transformers and voltage Taichung transformer test, usually only given in the load factor to persuade rate of 1 or 0.8 when the error data. But check station installed in the meter, it's actual load and power factor  mcb circuit breaker  with test status, and check the wiring inside the station stick together and  air circuit breaker  pressure drop and so may deviate from the original value of the actual error, so without reference to the certificate when the transformer test data on the exchange into JJG307 a 82 meter jump comprehensive error in verification procedures can make the results of the formula is not consistent with the actual situation.