Differential protection method for partition inverse-time transformer by considering DC bias effects
A technology of differential protection and DC bias, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as current transformer waveform distortion
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[0039] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] A method that takes into account the influence of DC bias on differential protection of transformers, in particular, prevents misoperation of differential protection due to the combined action of DC bias and non-periodic components of fault current to accelerate current transformer saturation when an out-of-area fault occurs in the transformer, At the same time, it avoids the new method of misoperation after the external fault is removed.
[0041] Such as figure 1 Shown is a flow chart of a new method for subregional inverse time transformer differential protection considering the influence of DC bias proposed by the present invention. The method includes the following steps:
[0042] (1) Assume that the sampling frequency of the microcomputer protection device is 1200Hz, and collect the DC current v...
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