DC cable thermal cycle voltage test device

Abstract

Disclosed is a DC cable thermal cycle voltage test device. The invention relates to a DC cable thermal cycle voltage test device. According to the existing DC cable thermal cycle voltage test device, a cross-under cable heating transformer and an AC heating mode are employed, the electric field distribution is changed when the temperature of a cable is changed, so that test cannot truly reflect the operation condition of the cable. Therefore, the existing DC cable thermal cycle voltage test device is defective. The DC cable thermal cycle voltage test device of the invention comprises a step-up transformer, and a rectifier bridge electrically connected with the step-up transformer. The rectifier bridge has a first output end and a second output end. A DC cable for test is connected between the first output end and the second output end. The high-potential end of the DC cable for test is connected to a DC high-voltage generator. According to the technical scheme, thermal cycle voltage test is carried out under direct current instead of traditional induced alternating current, the actual operation condition of a DC cable can be truly simulated, and test is closer to the actual working condition.

Description

technical field [0001] The invention relates to a thermal cycle voltage test device for DC cables. Background technique [0002] The existing DC cable thermal cycle voltage test device adopts a piercing cable heating transformer, and uses the induced AC current to conduct the heating test, while the DC cable passes a DC current during actual operation, and the AC heating method will cause the outer metal sheath to produce damage. Circulation loss, and then change the temperature distribution from the inside to the outside of the cable. The electric field distribution of the cable is directly related to the temperature. The AC heating method changes the electric field distribution while changing the temperature distribution of the cable, so that the test cannot truly reflect the operation of the cable. defect. Contents of the invention [0003] The technical problem to be solved and the technical task proposed by the present invention are to improve and improve the existin...

AI Technical Summary

Problems solved by technology

[0002] The existing DC cable thermal cycle voltage test device adopts a piercing cable heating transformer, and uses the induced AC current to conduct the heating test, while the DC cable passes a DC current during actual operation, and the AC heating method will cause the outer metal sheath to produce damage. Circulation loss, and then change the temperature distribution from the inside to the outside of the cable. The electric field distribution of the cable is directly related to the temperature. The AC heating method changes the electric field distribution while changing the temperature distribution of the cable, so that the test cannot truly reflect the operation of the cable. defect

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