On-line monitoring system and control method for insulation performance of DC equipment in urban rail transit

Abstract

The invention discloses an on-line insulation performance monitoring system and control method for DC equipment in urban rail transit. The system includes an insulation performance measurement module, an insulation performance acquisition system, a switch module and a control center; the insulation measurement module is installed in a rectifier cabinet, a DC switch cabinet, Between the equipment frame of the inverter feedback device cabinet and the grounding busbar, and connected to the insulation collection system; the electric isolating switch between the cabinet shell and the insulation measurement module is in the normally open state; the centralized grounding point of the frame protection components and the grounding busbar The switch between them is in the normally closed state; the insulation resistance data of the cabinet measured by the insulation measurement module is sent to the control center through the insulation acquisition module; Acts on the switch module. The invention can not only monitor the insulation performance of the DC equipment of the urban rail transit on-line, but also avoid the malfunction of the frame protection device, and has high reliability.

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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