A method and system for monitoring supporting capacitance of an auxiliary power supply

Abstract

The invention provides a method and system for monitoring the supporting capacitance of an auxiliary power supply, comprising: measuring the dielectric loss tangent value and the capacitance value of the supporting capacitance; and calculating the correction factor of the capacitance value change rate of the supporting capacitance based on the measured supporting capacitance dielectric loss tangent value and capacitance value ;Measure the insulation resistance of the support capacitor; calculate the insulation failure factor of the support capacitor based on the insulation resistance of the measurement support capacitor and the measured dielectric loss tangent value and capacitance value of the support capacitor; correction factor based on the insulation failure factor of the support capacitor and the rate of change of the support capacitor capacitance Monitor the remaining life of auxiliary power support capacitors. The invention avoids the on-site staff from dismantling and installing the support capacitor of the auxiliary power supply device of the EMU, and can conveniently, accurately and safely check the remaining support capacitor of the auxiliary power supply device of the EMU within a relatively short period of time without destroying the internal insulation of the support capacitor. life expectancy assessment.

Description

technical field [0001] The invention belongs to the technical field of support capacitance testing, and in particular relates to a method and system for monitoring auxiliary power supply support capacitance. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The EMU has been comprehensively developed in recent years, and compared with other transportation systems, the EMU system has many advantages in terms of transportation capacity, energy efficiency, operating cost, and environmental friendliness. With the continuous improvement of the running speed of the EMU, higher requirements are put forward for the operation safety and reliability of the EMU. [0004] As one of the core reactive power equipment designed and used on the EMU, the support capacitor plays the role of buffering the energy exchange between the AC side and the DC side, sta...

AI Technical Summary

Problems solved by technology

With the increase of the service mileage of the EMU, under the joint action of the main external stress—electrical stress and thermal stress, the supporting capacitor will cause aging damage to the polypropylene film of the internal insulating medium, which makes the insulation performance and electrical parameters of the supporting capacitor significantly affected. The decline, which in turn affects the service life of the support capacitor

[0005] So far, the life evaluation method of the support capacitor on the EMU is mainly to do the durability test when the support capacitor is offline, but this method takes a long time and will destroy the internal insulation of the capacitor, which will affect the reliability of the evaluation and cause the capacitor can not continue to use normally

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