This paper introduces the portable protection relay detecting device and the practical circuit, as well as the major functions.
介绍一种便携式保护继电器测试装置的设计及实用电路和主要功能。
Previously, a typical protection circuit would include a relay, resettable fuse and MOV combination to protect against the above combination of threats.
以往来说，典型电路保护将继电器、可恢复式保险丝、与金属氧化物压敏电阻组合来保护防止损害。
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。
The effects of PT secondary circuit on relay protection and measurement were analyzed by an example and the improving measures were set forward.
引用实例分析了PT二次回路对继电保护和计量的影响，并提出了改进措施。
IC type overload protection circuit has gradually replaced thermal relay overload protection mode.
煤电钻采用热继电器进行过载保护方式已逐渐被IC型过载保护电路取代。
The protection functions of relay don't be affected by current intensity of circuit or load, impulse current, imbalance current and load characteristic.
监视器的保护功能不受线路或负载的电流大小，冲击电流、不平衡电流和负载性质的影响。
At present the control and protection of relay of electromotor USES combined circuit, which has the limitation of weak control and faulty protecting function.
目前电动机的控制及保护的采用的组合式电路存在控制功能不强、保护功能不完善的缺陷。
Protection against motor over - load usually adopt thermal relay, but protection against line over - load usually adopt long delay over- current release of circuit- breaker.
电动机过载保护通常采用继电器，而配电线路过载保护多采用断路器的长延时过电流脱扣器来完成。
Because the voltage measuring error increases when phase to phase short circuit occurs, distance relay protection will act improperly.
但是短线路在两相短路时，由于测量电压的误差会放大，可能引起距离保护的超越。
Short-phase relay obtains short-phase signal, short-phase protection circuit was formed according to change of output voltage to realize short-phase protection.
用断相保护继电器获取断相信号，据输出电压变化构成断相保护电路实现保护。
This article presents a new method to detect CT and PT wire break. This method can be used on generator micrcomputer based relay protection device against internal short circuit fault.
本文提出了一种有效的单片机发电机内部短路保护中电流互感器CT和电压互感器PT的断线判别方法。
For a practical project, ideas of scheming the relay protection for double-circuit lines on the same tower and choosing the telecommunication channel are analysed.
结合某工程实例，剖析同杆双回线路保护配置和保护远传信号通道选择的思路。
For a practical project, ideas of scheming the relay protection for double-circuit lines on the same tower and choosing the telecommunication channel are analysed.
结合某工程实例，剖析同杆双回线路保护配置和保护远传信号通道选择的思路。
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