保定电气厂

本系列装置采用的是高性能的单机微片作为它的核心元件，对PT开口处的三角电压（即为零序电压）进行循环的检测。在正常工作的情况下，该电压是小于30V的装置内的大功率的消谐元件处于阻断的状态，对系统的正常运行不产生任何的影响。

The high performance single chip microcomputer is used as the core component of this series of devices, and the cycle voltage of the PT opening is zero voltage. Under normal working condition, the high power harmonic elimination component in the device whose voltage is less than 30V is in the state of blocking, and does not have any influence on the normal operation of the system.

当PT开口处的电压在30V以上时，系统会出现故障。装置内的消谐装置开始对此信号进行数据采集，通过电路对信号进行数字测量、滤波、放大等等数字信号处理技术，然后对检测到的数据进行分析、计算，得出故障类型。如果当前是铁磁谐振故障的话，系统后会立即启动消谐电路，使固态继电器导通，让铁磁谐振在阻尼的作用下迅速地消失。此时，CPU系统进行记录、存贮、并自动报警、显示谐振的相关信息（时间、频率、电压值）。

When the voltage at the PT opening is above 30V, the system will fail. The harmonic elimination device in the device begins to collect the signal, and through the circuit to carry on the digital measurement, the filter, the amplification and so on the digital signal processing technology, then carries on the analysis and the computation to the detected data, obtains the fault type. If the current is ferromagnetic resonance fault, the system will immediately start the harmonic elimination circuit, so that the solid state relay conduction, so that ferromagnetic resonance in the role of damping rapidly disappear. At this time, the CPU system records, stores, and automatically alarm and display the related information of the resonance (time, frequency, voltage value).

如果电路是过电压或者是单相接地的故障，微机系统进行检测后，会分别给出显示以及报警，并且记录、存储有关的故障信息。CPU系统处理完之后，会返回起始的状态，而后继续检测电路中的状态。

If the circuit is overvoltage or single-phase grounding fault, after detecting the microcomputer system, it will display and alarm separately, and record and store the related fault information. After the CPU system is processed, the initial state will be returned, and then the state of the circuit will continue to be detected.