RED670 电流互感器用于测量线路两端的电流值

Description

RED670 电流互感器用于测量线路两端的电流值

线路差动保护是电力系统中一种重要的保护装置，RED670用于检测线路上的相间故障和其他异常条件。它的基本原理是通过比较线路两端的电流来实现对线路状态的监测和保护。当线路发生故障时，故障电流会流过线路两端，此时差动保护装置会比较两端电流的差值，如果差值超过一定范围，就会判断为线路故障，并触发保护动作，例如跳闸等，从而隔离故障部分，保证电力系统的安全稳定运行。

在实际应用中，RED670线路差动保护装置通常由差动继电器、电流互感器和电压互感器组成。电流互感器用于测量线路两端的电流值，电压互感器则用于测量线路两端的电压值，差动继电器则负责将电流和电压信号进行差动计算和比较。同时，为了提高差动保护的可靠性和灵敏度，还可以采用一些辅助措施，例如采用速饱和变流器来防止由于区外故障一次电流中的直流分量导致电流互感器饱和引起的保护误动作。

此外，光纤电流差动保护是线路差动保护的一种重要形式，RED670采用光纤通道将线路两端的电气量信息传输到对端进行比较，具有传输速度快、抗干扰能力强等优点。在现代电力系统中，光纤电流差动保护已经成为主流的保护方式之一。

RED670 电流互感器用于测量线路两端的电流值

Line differential protection is an important protection device in power system, RED670 is used to detect interphase faults and other abnormal conditions on the line. Its basic principle is to realize the monitoring and protection of the state of the line by comparing the current at both ends of the line. When the line fails, the fault current will flow through both ends of the line, at this time the differential protection device will compare the difference between the two ends of the current, if the difference exceeds a certain range, it will be judged as a line fault, and trigger the protection action, such as tripping, so as to isolate the fault part, to ensure the safe and stable operation of the power system.

In practical application, RED670 line differential protection device is usually composed of differential relay, current transformer and voltage transformer. The current transformer is used to measure the current value at both ends of the line, the voltage transformer is used to measure the voltage value at both ends of the line, and the differential relay is responsible for differential calculation and comparison of the current and voltage signals. At the same time, in order to improve the reliability and sensitivity of differential protection, some auxiliary measures can also be adopted, such as the use of speed saturation converter to prevent the protection error caused by the saturation of the current transformer due to the DC component of the fault primary current outside the area.

In addition, fiber optic current differential protection is an important form of line differential protection. RED670 uses fiber channel to transmit the electrical information at both ends of the line to the opposite end for comparison, which has the advantages of fast transmission speed and strong anti-interference ability. In modern power system, fiber optic current differential protection has become one of the mainstream protection methods.