Generator stator monophase grounding protection by fault component phase angle diffrentiation
A generator stator and fault component technology, applied in the electrical field, can solve the problems of reduced sensitivity, complicated selection of on-site protection schemes, insufficient protection action sensitivity, etc., to ensure reliability, high protection sensitivity and reliability, and high start-up sensitivity. Effect
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[0029] The following embodiments are provided in combination with the content of the method of the present invention:
[0030] The method of the present invention has been experimentally verified on a 15kVA salient pole analog generator. The machine has two parallel branches per phase, each branch has 10 coils in series, the 5 coils near the machine end have 4 turns for each coil, and the 5 coils near the neutral point have 2 turns. There are 3 fault points a1 (a=40%), a3 (a=70%), a5 (a=90%) on the A1 branch road, and 3 fault points a2, a4, a6 on the A2 branch road , The electrical position is symmetrically distributed. Before the short circuit, the motor was in rated operation, with excitation current of 1.55A, output power of 12kW, power factor 0.8, rated phase voltage amplitude of 115V, and 800V after step-up transformation. It was connected to a 220kY analog line to simulate a 700MW large hydraulic generator. A large number of calculations and analyses of various conditions ha...
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