On-line insulation performance monitoring system for urban rail transit direct current equipment and control method

Abstract

The invention discloses an on-line insulation performance monitoring system for urban rail transit direct current equipment and a control method. The system comprises an insulation performance measuring module, an insulation performance collecting system, a switch module and a control center, wherein the insulation measuring module is installed between an equipment frame of a rectifier cabinet, adirect-current switch cabinet and an inverter feedback device cabinet and a grounding busbar and is connected to the insulation acquisition system; an electric isolating switch between a cabinet shelland the insulation measuring module is in a normally open state; a switch between a centralized grounding point of a frame protection element and the grounding busbar is in a normally closed state; the insulation measuring module is used for measuring the insulation resistance data of the cabinet body and sending the insulation resistance data to the control center through the insulation acquisition module; and the control center is regularly sending a monitoring signal for maintaining the state of the switch module, continuously receiving insulation resistance data, performing logic judgmentand acting on the switch module. According to the system, the insulation performance of the urban rail transit direct current equipment can be monitored online, the misoperation of a frame protectiondevice can be avoided, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of direct current power supply for rail transit, in particular to an on-line monitoring system and control method for the insulation performance of direct current equipment for urban rail transit. Background technique [0002] The DC electrical cabinet is an important part of the DC power supply system of urban rail transit, and the insulation performance of the cabinet has an important impact on the stable operation of the traction power supply system. Urban rail transit has the characteristics of centralized single-point grounding of the DC electrical cabinet frame. The operator's method of testing the insulation performance of the electrical cabinet is relatively traditional, and there is no comprehensive monitoring system and control method. At this stage, the monitoring of the insulation performance of urban rail DC equipment is mainly concentrated on manual measurement using shaking meters during const...

AI Technical Summary

Problems solved by technology

At this stage, the monitoring of the insulation performance of urban rail DC equipment is mainly concentrated on manual measurement using shaking meters during construction, which is relatively time-consuming and laborious. However, the scheme of regularly replacing the platform insulation board after the train is put into operation will cost a lot of money and the system reliability is not high.

During the operation of the subway, the insulation performance of the electrical cabinet frame shell cannot be monitored online

[0003] From the perspective of the stable operation of the urban rail transit power supply system, on the one hand, if the insulation damage of the DC equipment on the platform occurs, the manual shaking meter method for insulation resistance monitoring cannot provide timely fault feedback; on the other hand, the operator is using the insulation meter for insulation measurement. It is necessary to manually disconnect the frame protection equipment from time to time, and the operation is relatively cumbersome

In addition, the insulation and sealing of the cable hole under the electrical cabinet is not strict, and the water vapor in the cable layer rises to the cabinet body, and failures that damage the insulation performance of electrical equipment occur from time to time.

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