Method for measuring error of current transformer under 200Hz frequency

Abstract

The invention relates to a method for measuring the error of a current transformer under a 200Hz frequency, and belongs to the technical field of transformer detection. The technical scheme comprises the following process steps of: (1) verifying the transformer to acquire a ratio difference and a phase difference of the current transformer under 50Hz; (2) performing a 50Hz test and a 50Hz no-load test on the current transformer to acquire related data of a current vector diagram of the current transformer; (3) performing a 200Hz test on the current transformer to acquire related data of the current vector diagram of the current transformer; and (4) substituting the related data into a mathematical relation acquired according to the current vector diagram of the current transformer to acquire the ratio difference multiple and the phase difference multiple of the current transformer under 200Hz and 50Hz, and multiplying by the ratio difference and the phase difference under 50Hz respectively to acquire a ratio difference and a phase difference of the current transformer under 200Hz. The method has the advantage that: the error of a 50Hz standard current transformer under the 200Hz frequency can be detected.

Description

Technical field: [0001] The invention relates to an error measurement method of a current transformer at a frequency of 200 Hz, and belongs to the technical field of transformer detection. Background technique: [0002] In the actual operation of the converter transformer, its winding current contains certain harmonics. In the manufacturing plant, in order to estimate the load loss of the converter transformer under operating conditions, two loss measurements are performed. One is carried out at the rated frequency, and the other is carried out at a certain frequency not lower than 150Hz, and the test frequency of 200Hz is generally used. The load losses of the converter transformer are then calculated from these measurements. In load loss measurement, due to the large test current, it is generally necessary to use a measuring current transformer. At present, there are only 50Hz standard current transformers in our country, that is, the error of the current transformer ca...

AI Technical Summary

Problems solved by technology

At present, there are only 50Hz standard current transformers in our country, that is, the error of the current transformer can only be verified at 50Hz. When it is used at a frequency of 200Hz, because there is no 200Hz standard current transformer, the current cannot be obtained by conventional verification methods. transformer error

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