Flashover test device and method in gas insulated power equipment under temperature gradient working condition

Abstract

The invention discloses a flashover test device and a flashover test method in gas insulated power equipment under a temperature gradient working condition. The flashover test device comprises a flashover test module used for providing a flashover platform base for placing a high-voltage flashover electrode, a low-voltage flashover electrode and an insulated sample; an inflation and deflation module used for providing buffer gas and environment-friendly insulating gas for a gas insulation discharge test cavity; an illumination gathering heating module used for emitting visible light to heat the high-voltage flashover electrode; an environment working condition monitoring module used for monitoring the temperature of the high-voltage flashover electrode and the environment temperature and humidity; and a high-voltage input and current detection module used for outputting high voltage to act on the heated high-voltage flashover electrode, so that the flashover electrode has a flashover phenomenon, and the current of the flashover electrode is detected. The flashover test device can accurately discuss flashover tests under environment-friendly insulating gases with different temperature gradients, different gas pressures and different proportions, and can research the influence of different environments on flashover voltage.

Description

technical field [0001] The invention relates to the technical field of electrical insulation and discharge of power equipment, in particular to a flashover test device and method under temperature gradient conditions in gas-insulated power equipment. Background technique [0002] Compared with traditional overhead transmission lines, gas-insulated enclosed combined electrical appliances (GIS) and gas-insulated transmission pipelines (GIL) are widely used due to their high reliability, small footprint, convenient operation and maintenance, and low external interference. in the transmission line. Gas-insulated high-voltage electrical equipment such as gas-insulated high-voltage electrical appliances (GIS) and gas-insulated transmission pipelines are prone to high field strength during operation, which will lead to surface flashover accidents at the interface between insulating gas and epoxy resin insulating materials or EPDM materials , is a relatively common insulation fault...

AI Technical Summary

Problems solved by technology

[0004] Some scholars have designed flashover experiment schemes at different temperatures, and placed high-temperature ceramic heating plates at the bottom of the ground electrode to realize the flashover device under the temperature gradient working condition of "ground electrode-high voltage electrode". Conditions - high voltage side (high temperature) - ground electrode side (low temperature) working conditions are less developed

At the same time, the temperature sensor in this scheme cannot effectively and directly measure the temperature of the epoxy post insulator, and the detection accuracy is low

In addition, some people have learned to use the oil bath heating method to carry out temperature gradient tests, but the heating rod is generally made of metal, which will inevitably be affected by the high voltage at the electrode

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