Corona resistance testing device and method for varnished wires

Abstract

The invention discloses a corona resistance testing device and method for varnished wires. The testing device comprises a consistent-temperature oven, an IGBT (Insulated Gate Bipolar Translator) system, a communication system, a control system and a power supply. During test, two pins of wire pairs are inserted in a sample socket in the consistent-temperature oven; the control system controls the work of the consistent-temperature oven and detects the working temperature of the oven in real time, and when a detected temperature reaches a set value, the control system controls the IGBT system to work; the IGBT system generates high-frequency voltage and applies the high-frequency voltage to the two varnished wire pairs to be tested in the consistent-temperature oven so as to conduct the test; the control system records testing time in real time, judges the breakdown time of the corona-resistant varnished wires according to the change of working signals of the IGBT system, and records the testing time and temperatures; and after the test is finished, the control system controls the consistent-temperature oven and the IGBT system to stop working. The testing device and method with the scheme provided by the invention have the advantages of stability, reliability, high testing efficiency, high precision, clearness and definition in display, and simplicity and convenience in operation.

Description

technical field [0001] The invention relates to an enameled wire corona resistance test technology, in particular to an enameled wire corona resistance test device and a corresponding test method. Background technique [0002] When the enameled wire is connected to a high-frequency changing voltage, an uneven electric field will be generated on the surface and inside the wire. Under the action of the uneven strong electric field, the conductor electrode with a small curvature radius will discharge the surrounding gas, which will cause the gas to be partially dissociated. The phenomenon is called corona. [0003] The free ions and electrons impact the polymer chains, together with the effect of ozone and local heating caused by the discharge, the polymer materials on the surface of the paint layer will be cracked, resulting in embrittlement and even cracking, which will eventually lead to the shock of the insulating paint layer. Put on. The ability of the enameled wire pain...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that existing enameled wire corona resistance test technology is based on actual use conditions and common power frequency, and the test efficiency and test accuracy are low, and provides an enameled wire corona resistance test device

Images