A new type of rail potential limiting device

A limiting device and rail potential technology, which is applied in the field of new rail potential limiting devices, can solve problems such as easy-to-burn devices, rail potential limiting device failures, and inability to reset, so as to reduce stray currents and ensure safety.
CN109066643APending Publication Date: 2018-12-21CHENGDU ZHONGGONG ELECTRIC ENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHENGDU ZHONGGONG ELECTRIC ENG
Publication Date
2018-12-21

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Abstract

The invention provides a novel rail potential limiting device using power electronics and microcomputer control technology, with the development of high-power power electronic devices, the main circuit adopts multiple thyristors, IGBT, series-parallel connection of diodes, the intelligent rail potential measuring and controlling device is used to control the thyristor and the IGBT to realize the intelligent input or output of the voltage limiting branch circuit, The rail potential limiting function of automatically limiting voltage and current when rail potential rises and automatically turning off when rail potential drops can not only ensure the safety of human body and equipment, but also greatly reduce the total stray current leakage through OVPD equipment, and effectively improve theprotection effect of stray current in metro.
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Description

technical field

[0001] The invention relates to a conductive or insulating device arranged along the running track or at its junction, and in particular relates to a new rail potential limiting device. Background technique

[0002] Rail potential limiting device——Rail over-voltage protection device (hereinafter referred to as OVPD) is a key component of the traction operation system of urban rail trains. It is related to the operation safety of the traction power supply system and the safety of staff and passengers. The main measures to prevent the rail potential from being too high. At present, OVPDs are installed in station substations and parking lots / depots of all subway lines across the country.

[0003] The OVPD is set between the rail and the protection ground, and is disconnected under normal operating conditions. At present, the OVPD put into use in domestic subways generally adopts a three-stage setting: Stage I: When the detected potential difference reaches the...

Claims

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