Urban rail traction power supply system and urban power main transformer DC bias synchronous monitoring system

Abstract

The invention discloses an urban rail traction power supply system and urban power main transformer direct current bias synchronous monitoring system, which is used for monitoring the problem of urbanpower main transformer direct current bias caused by urban rail stray currents. The synchronous monitoring system is composed of three subsystems: an urban rail drainage network current monitoring subsystem, a power main transformer neutral point current monitoring subsystem, and a comprehensive analysis subsystem. The hardware of the urban rail drainage network current monitoring subsystem consists of a Hall sensor, a signal conditioning board, a data acquisition card, a GPRS wireless transmission module and an industrial control computer. The hardware of the power main transformer neutral point current monitoring subsystem consists of a Hall current sensor, a signal conditioning board, a data acquisition card and an industrial control computer.

Description

technical field [0001] The invention relates to the field of equipment online monitoring, in particular to a synchronous monitoring system for an urban rail traction power supply system and an urban power main transformer DC bias. Background technique [0002] In recent years, urban rail transit has achieved rapid development in my country. By the end of 2016, 30 cities in mainland China had opened and operated a total of 133 urban rail transit lines, with a total length of 4152.8 kilometers. The urban rail traction power supply system generally adopts the DC power supply method, and the subway train takes the current from the catenary (or the third rail) and realizes the return through the rail. However, since the subway rails are difficult to be completely insulated from the earth, part of the current leaks into the ground to form stray currents in the ground. The characteristics of the increase lead to the distortion of the ground potential, which is enough to affect the...

AI Technical Summary

Problems solved by technology

However, since the subway rails are difficult to be completely insulated from the earth, part of the current leaks into the ground to form stray currents in the ground. The characteristic of increasing, leading to the distortion of ground potential, is enough to affect the main transformer of urban power and manifested through the phenomenon of DC bias

[0003] In the past, the DC bias phenomenon of the transformer is mainly caused by the high-voltage DC transmission system or the geomagnetic induction current. The DC bias phenomenon of the main power transformer caused by the urban rail stray current has only been discovered and paid attention to in recent years. At present, there is no monitoring device to monitor this, so a synchronous monitoring system for urban rail traction power supply system and urban power main transformer DC bias is needed to monitor and analyze the phenomenon of power main transformer DC bias caused by urban rail stray current

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