Selective generator stator single phase grounding protective method
A stator grounding protection, generator stator technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as lack of selectivity, and achieve high protection sensitivity, reliability, and high sensitivity
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[0031] The following examples are provided in conjunction with the content of the method of the present invention:
[0032]The method of the present invention is verified by experiments on a 15kVA salient pole analog generator. Due to limited conditions, the generator does not have the form of expanding unit wiring, and the generator can only be used for external short-circuit fault experiments. Each phase of the machine has two parallel branches, and each branch has 10 coils in series, 5 coils near the machine end are 4 turns per coil, and 5 coils near the neutral point are 2 turns. There are 3 fault points a1 (α=40%), a3 (α=70%), a5 (α=90%) on the A1 branch road, and 3 fault points a2, a4, a6 on the A2 branch road , the electrical positions are symmetrically distributed. Before the short circuit, the motor is in rated operation, the excitation current is 1.55A, the output power is 12kW, the power factor is 0.8, and the rated phase voltage amplitude is 115V. After step-up, t...
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