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Improvements to Circuit Overcurrent and Distance Relay Protection of transmission lines, AC
Improvements to Circuit Overcurrent and Distance Relay Protection of transmission lines, AC
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机译：改善交流线路的电路过电流和距离继电保护
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摘要
The protective relay circuits herein provide a combined distance and overcurrent type of function. The protective relay circuit includes an a- c level detector or bi-polar threshold circuit to which the quantity I (Z. sub.R - Z.sub.F) is applied. The quantity I is the current in the line, Z. sub.R is a replica or reference impedance corresponding to the lines being protected and Z.sub.F is the line impedance to the fault from the relay measuring point. IZ.sub.F is equal to V, the voltage input to the relay. An output is provided from the a-c level detector only when the quantity I (Z.sub.R - Z.sub.F) exceeds a predetermined value. The output of the level detector is compared in a coincidence circuit, or AND gate, with a polarizing signal. The detection of coincidence for a selectable predetermined time period, as measured by a characteristic timer, results in an output signal for use in controlling operation of the trip coil of the circuit breaker. The protective relay circuit may be used on series- capacitor compensated lines as well as on uncompensated lines. When the protective relay circuit is used on a compensated line, the a-c threshold level of the level detector is set to be a function of the breakdown voltage of the spark gap protecting the series compensating capacitor.
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机译：本文中的保护继电器电路提供了距离和过电流的组合功能。保护继电器电路包括一个交流电电平检测器或双极性阈值电路，在该电路上施加了数量I（ZR-ZF）。量I是线路中的电流，Z R是与受保护线路相对应的复制阻抗或参考阻抗，Z F是从继电器测量点到故障的线路阻抗。 IZF等于输入到继电器的电压V。仅当量I（Z R -Z F）超过预定值时，才从交流电平检测器提供输出。电平检测器的输出在符合电路或“与”门中与极化信号进行比较。由特征计时器测量的在可选择的预定时间段内的一致性检测导致输出信号，该输出信号用于控制断路器的跳闸线圈的操作。保护继电器电路可用于串联电容器补偿的线路以及未补偿的线路。当保护继电器电路用于补偿线路时，电平检测器的a-c阈值电平设置为保护串联补偿电容器的火花隙的击穿电压的函数。
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