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

A traction power supply system, DC bias magnetization technology, applied in voltage/current isolation, measurement of electrical variables, measurement of current/voltage, etc. Novel technical content and simple effect on site

Active Publication Date: 2019-02-26
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Urban rail traction power supply system and urban power main transformer direct current bias synchronous monitoring system

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Embodiment

[0022] figure 1 It is shown that a specific embodiment of the present invention is a synchronous monitoring system for urban rail traction power supply system and urban power main transformer DC bias magnetism, which consists of:

[0023] The entire synchronous monitoring system is divided into three subsystems: the neutral point current monitoring subsystem of the power main transformer 1, the urban rail drainage network current monitoring subsystem 2, and the comprehensive analysis subsystem 3; the urban rail drainage network current monitoring subsystem 2 The hardware consists of Hall sensor 17 / 18, signal conditioning board 19 / 20, data acquisition card 21 / 25, GPRS wireless transmission module 29 / 30, and industrial computer 31; System 1 hardware consists of Hall current sensor 5 , signal conditioning board 6 , data acquisition card 7 , and industrial computer sequentially constitute 11 ; said synchronous comprehensive analysis subsystem 3 hardware consists of background serv...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/20G01R19/00
CPCG01R15/202G01R19/00
Inventor 李小鹏林圣梁晓斌张纯张鹏
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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