Calculation method of MOA resistive fundamental current increase rate based on resultant vectors
A technique for synthesizing vector and fundamental wave currents, applied in the directions of measuring current/voltage, measuring electricity, measuring electric variables, etc., can solve problems such as influence, avoid misjudgment, improve absolute accuracy and relative accuracy, and overcome interphase coupling capacitance Effect
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[0016] The principles and solutions of the present invention will be further described below in conjunction with the drawings and specific embodiments.
[0017] The three-phase arresters in the power system are usually installed in a "one" arrangement. The present invention discusses the three-phase MOA model arranged in a word. Since A and C are far apart, the interphase capacitive coupling current between them can be ignored, and only the interphase capacitive coupling current between A, B and B, C is considered, and the equivalent circuit of the three-phase MOA working state is obtained as figure 1 Shown. In the picture: Is the three-phase voltage vector of the power grid; It is the actual valve current vector, but it cannot be directly measured; The leakage current vector, which is the doped coupling capacitor current, can be directly measured, but is affected by the coupling capacitor; Is the coupling capacitor current vector between phases; R a , R b , R c Three-phase MO...
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