工作原理 Working principle editor 本装置采用高性能的单片微机作为核心元件，对PT开口三角电压（即零序电压）进行遁环检测。正常工作情况下，该电压小于30V，装置内的大功率消谐元件 （固态继电器）处于阻断状态，对系统运行不产生影响。当PT开口电压大于30V时，系统出现故障。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，系统立即启动消谐电路，使固态继电器导通，让铁磁谐振在阻尼作用下迅速消失。此时，CPU系统进行记 录、存贮，并自动报警、显示谐振信息（时间、频率、电压值）。如果电路是过电压或单相接地故障，微机系统检测后，分别给 出显示和报警，并记录、存贮有关故障信息。CPU系统处理完最后，返回起始状态，并继续检测电路中的状态。 The device adopts the high performance monolithic microcomputer as the core component, and the test of the clench of the open delta voltage (i.e., zero sequence voltage) of PT open. Under normal working condition, the voltage is less than 30 v, the device of high power harmonic elimination internal components (SSR) in the blocking state, impact on system operation not. When the PT open voltage is greater than 30V, the system fails. Harmonic elimination device began the process of signal data collection, through the circuit for digital signal measurement, digital signal processing technology such as filtering, amplification, and then analyze the detected data, calculation, it is concluded that the fault type. If the current ferromagnetic resonance is present, the system will activate the anti-harmonic circuit immediately, so that the solid state relay conductance, and the ferromagnetic resonance will disappear rapidly under the damping effect. At this point, the CPU system is recorded, stored, and automatically alarm and display the resonant information (time, frequency, voltage value). If the circuit is overvoltage or single phase ground fault, the microcomputer system is tested, and the information about the fault is recorded and stored. The CPU system finishes, returns the initial state, and continues to detect the state in the circuit.