Method for measuring line parameter through induced electricity

感应电测量线路参数的方法

Abstract

The present invention provides a method for measuring a line parameter through induced electricity, which is characterized by comprising the following steps: (1) setting one end of a line into an open-line state, maintaining the other end to a ground state, selecting an internal power reference phase, and utilizing a voltage divider and a waveform measuring and recording device to measure a three-phase open-line induced voltage of a dead line in a common tower or parallel multi-circuit line on the premise of not applying a signal source outwards; (2) maintaining both ends of the line to the ground state, selecting the internal power reference phase, and utilizing a current transducer and the waveform measuring and recording device to measure a three-phase short-circuit induced current of the deadline; and (3) decomposing the induced voltage and the induced current by the processing of software and hardware such as filtering, nuclear phase, sequence component decomposition and the like to obtain zero-sequence and positive-sequence voltages and zero-sequence and positive-sequence currents so as to obtain zero-sequence impedance and positive-sequence impedance of the dead line. The method adopts a signal measuring and recording device to measure the induced voltage and the induced current on the dead line on the premise of not applying power outwards, and utilizes a component decomposition method to solve the line parameter so as to prevent the line parameter from being impacted by the induced electricity.
本发明提供一种感应电测量线路参数方法,其特征在于:包括以下步骤(1)将线路一端置为开路状态,一端保持接地状态,选定内部电源参考相,在不外施信号源的前提下,利用分压器及波形测录装置测量同塔或平行多回线路中停电线路的三相开路感应电压;(2)将线路两端保持接地状态,选定内部电源参考相,利用电流变送器及波形测录装置测量停电线路的三相短路感应电流;(3)通过滤波、核相、序分量分解等软硬件处理,分解得到零序和正序电压、电流,从而得出停电线路的正序、零序阻抗。本发明在不外施电源的前提下,采用信号测录装置测量停电线路上的感应电压和电流,利用序分量分解法求解线路参数,避免了感应电对线路参数测量的影响。

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