A lightning protection compensator with monitoring function and a monitoring method thereof

Abstract

A lightning protection compensator with monitoring function comprises a control unit, a lightning protection selenium stack leakage current detection unit and a compensation capacitor working currentdetection unit. The two detection units respectively includes a current sensor, I / V circuit, impedance matching circuit and A / D converter, the input terminals of the two detection units are respectively connected with a leakage current loop of a lightning protection selenium stack and a working current loop of a compensation capacitor. The output terminals are respectively connected with the control unit, the output terminals of the control unit are connected with the system host, and the detection unit collects the current of the current loop through the current sensor and converts the current into digital signals, and then transmits the digital signals to the control unit for processing, judging or alarming. The monitoring method includes initial setting, reading threshold, sampling, calculating root-mean-square and judging. The lightning protection compensator can monitor and judge the leakage current of the lightning protection selenium stack and the working current of the compensation capacitor in real time, alarm when the leakage current does not conform to the requirements, collect the data in time, measure the result accurately, and monitor the method scientifically and reliably, so as to ensure the normal and safety of the driving order.

Description

technical field [0001] The invention relates to a railway lightning protection device and method, in particular to a lightning protection compensator with monitoring function and a monitoring method suitable for railway 25Hz phase-sensitive track circuits. Background technique [0002] Railway 25Hz phase-sensitive track circuit is a track circuit commonly used in my country. It consists of a power supply, a sending end and a receiving end. The sending end equipment includes a power transmission choke transformer, a track transformer, etc., and the receiving end equipment includes a power receiving choke transformer and a track transformer. , lightning protection compensator, protective box, 25Hz track relay, etc. [0003] Among them, the lightning protection compensator has two independent functions, one function is to use the lightning protection selenium stack to protect the track input side of the 25Hz track relay, and the other function is to use the compensation capacito...

AI Technical Summary

Problems solved by technology

[0004] During use, the performance of the selenium stack will gradually decline over time, resulting in an increase in leakage current. When the leakage current is greater than a certain value, it will affect the work of the track relay and cause the track circuit "red light band"; similarly, The capacity of the compensation capacitor will gradually decrease with the passage of time. After the capacity of the compensation capacitor decreases, the power factor of the local power supply circuit will be reduced, and the load on the local power supply will be increased. If the local power supply is overloaded, the output voltage will not be stable. Stable, affecting the reliability of the entire track circuit operation

[0005] The problem existing in the existing technology is that the working performance of the lightning protection compensator cannot be detected in real time, and only regular manual testing can be adopted. Once the leakage current of the lightning protection compensator is greater than a certain value, the track relay will fall by mistake and cause the track circuit The failure of the "red light belt" will cause traffic disorder and directly threaten driving safety

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