Partial discharge simulation experiment device of suspended metal particles in oil of transformer

Abstract

The invention discloses a partial discharge simulation experiment device of suspended metal particles in oil of a transformer, which belongs to the technical field of partial discharge online monitoring of oil immersed transformers. The partial discharge simulation experiment device mainly comprises an induction regulator, a non-corona test transformer, a non-partial discharge protective resistor, a standard capacity voltage divider, a partial discharge generation device, a noninductive detection resistor, an ultrahigh frequency antenna, a coaxial cable, a broadband high-speed large-capacity digital storage oscillometer and the like. The partial discharge simulation experiment device can simulate stable partial discharge signals generated by the suspended metal particles in flowing oil with different oil flowing speeds at different temperatures when the oil immersed transformer is in a working stage. Therefore, the partial discharge simulation experiment device can be widely applied to the simulation of partial discharge generated by the defect of the suspended metal particles in the oil immersed transformer in a laboratory and can provide reliable experimental data for teaching, scientific research institutions and schools and transformer manufacturers to monitor oil immersed transformers on line and analyze and apply partial discharge signals.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of partial discharge (PD) of oil-immersed power transformers, in particular to an artificial simulated experimental device for partial discharge of metal particles suspended in forced oil circulation transformer oil. Background technique [0002] Large power transformers are one of the most expensive and strategically important equipment in the power transmission network, and their reliability plays a vital role in the safe and reliable operation of the entire power system. The current operating power transformers with a voltage level of 220kV and above all use oil-immersed transformers. The failure of large-scale oil-immersed power transformers due to oil-paper insulation breakdown has serious consequences, resulting in huge maintenance costs and economic losses caused by large-scale power outages. The threat to operational safety mainly comes from the oil insulation system. Pure tran...

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Problems solved by technology

However, the discharge model can only simulate the partial discharge generated by a single metal particle under the action of the column-plate electrode, and cannot change the field strength, temperature and other influencing factors, and cannot generate oil flow, and cannot truly simulate the partial discharge caused by the metal particle in the transformer oil in actual operation. Case

Suspended metal particles produce partial discharge in transformer oil, which is affected by factors such as field strength, oil flow velocity, temperature, metal particle material and size, etc. Therefore, the forced oil circulation in operation cannot be simulated by the metal particle defect model in stationary oil. Partial Discharge Caused by Metal Particles in Transformer Oil

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