Accurate fault current sampling device for power transmission

Abstract

The invention discloses an accurate fault current sampling device for a power transmission line, which is provided with tree normal channels and three fault channels, wherein each channel is composed of a current preposed processing module, a signal conditioning module, an analog-to-digital conversion module, a channel switching module, a data processing module, a data storage model, a peripheral clock control module and a communication module which are connected sequentially according to the signal trend. The device collects current signals under different states purposefully through the switching of signal collecting channels, the spectrum range of the collected signals is widened, the high-frequency transient fault current signal distortion is prevented, and the complete collection of working frequency fault current information is realized.

Description

technical field [0001] The invention relates to the field of substation fault current monitoring, in particular to an accurate sampling device for transmission line fault current. Background technique [0002] On high-voltage long-distance transmission lines, in order to ensure the stable operation of the power system, it is required to accurately collect line fault signals. When a short circuit occurs in a power system composed of inductive elements, there will be aperiodic free components decaying with time in the short circuit transient process. Transmission lines not only have inductance, but also have capacitance between lines and between lines and ground, and these parameters are evenly distributed along the line. Therefore, when there is a high-voltage power frequency fault, there are infinitely many periodic free components that decay with time, and their frequencies are all higher than the power frequency. [0003] The high-frequency transient components of high-v...

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Problems solved by technology

[0004] However, in the traditional protection based on power frequency, the high-frequency components in the signal collection process are usually filtered out as interference, resulting in distortion of the fault current signal, which is not conducive to the effective operation of the substation.

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