Differential current calculation method for gear adjustment of adaptive UHV tap transformer
A voltage regulating transformer and differential current technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problem of inability to obtain real-time gear information, and achieve the effect of ensuring accurate and reliable operation, improving sensitivity, and improving reliability.
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[0064] Since the three phases A, B, and C of the UHV voltage regulating transformer are composed of three independent transformers, the differential protection of phase C of the UHV voltage regulating transformer is taken as an example to illustrate. A new method is used to obtain the actual operating gear of the voltage regulating transformer and correct the differential current introduced into the protection device. The process is as follows:
[0065] 1) In the simulation model, set the operating voltage of the UHV transformer as That is, the operating gear of the voltage regulating transformer is 4 gears. The differential current of phase C is converted to the primary side of the secondary side TA5 of the voltage regulating transformer, and its waveform within 0.1s (20ms closing) is as follows image 3 shown;
[0066] 2) Calculate the C-phase differential current when the differential current is compensated with a fixed transformation ratio. The fixed transformation r...
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