With the development of fiber optic cable technology, transmitting relay protection signal through optic cable are getting more and more popular.
随着光纤技术的迅猛发展，利用光纤传输继电保护信号，已获得了业内人士的普遍欢迎。
CVT is a signal sampling device which is widely used to carry out an energy metering, measuring voltage and relay protection in high-voltage power network at home and abroad.
电容式电压互感器是广泛应用在国内外高压电网中的一种用以进行电能计量、电压丈量和继电保护的信号取样装置。
Temperature relay tests temperature of motor, if it exceeds rating temperature to send a signal, contactor cut off main circuit to complete protection of motor.
温度继电器检测电动机温度，超过额定温度发出信号，接触器切断主电路，完成电机保护。
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