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Short circuit detecting circuitry for three=phase machine - uses relays with resistors and filters to detect displacement voltages of third harmonic and fundamental frequency
Short circuit detecting circuitry for three=phase machine - uses relays with resistors and filters to detect displacement voltages of third harmonic and fundamental frequency
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机译:三相电机的短路检测电路-使用带有电阻器和滤波器的继电器来检测三次谐波和基频的位移电压
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摘要
A ring 6-phase transformer (2) has its prim winding (21) between a star point of the three-phase electrical machine (1) and earth. A three-phase transformer (3) has its prim, winding (31,33,35) connected together to an earthed star point, their other sides being connected to output terminal poles of the machine winding (11, 12, 13). The sec winding (32,34,36) of the three-phase transformer are connected to an open triangle. One terminal pole of the latter is connected to impedance, (41,42) forming a voltage divider (4). Another terminal pole (6) is connected to the sec winding (22) of the single-phase transformer and co earth. ADVANTAGE - Detects both earth and winding short circuit.
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