Unbalance protection method for excitation current of no-load switch-on unsaturated zone of transformer
A no-load closing and exciting current technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of no-load closing misoperation, insufficient transformer sensitivity, and low transformer saturation magnetic density.
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[0059] In order to make the purpose, technical solution, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings.
[0060] The excitation current unbalance protection method in the unsaturated region of the present invention consists of a method for unbalanced excitation current protection in the unsaturated region, wherein the method for unbalanced excitation current protection in the unsaturated region consists of the following steps:
[0061] S11: When the transformer is switched on with no load, the current on the switching side is digitally filtered using the digital filtering method of the short data window;
[0062] S12: Calculate the fundamental current vectors of the a, b, and c three-phase currents in the unsaturated area by using the current filtered out in the unsaturated area;
[0063] S13: When the unbalance degree of a, b, and c three-phase currents in the unsatu...
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