Multiscale Fusion Simulation of the Influence of Temperature on the Partial Discharge Signal of GIS Insulation Void Defects

Abstract

Gas insulated switchgear (GIS) in service may tolerate large temperature changes, which leads to uncertainty in the evaluation of the partial discharge (PD) signal. To clarify the influence of temperature on the discharge signals of GIS insulation void defects, this paper proposes a multiscale fusion simulation method and used experiments to verify it. This method combines the streamer simulation at the micro level and the circuit simulation model at the macro level, and a more accurate simulation signal of GIS insulation void PDs under the influence of temperature can be obtained. Experiments have also been carried out, and a PDs detection experiment platform that can be set in different temperature environments was built. The discharge signals at different temperatures were obtained follow IEC60270. Finally, by combining analyses of simulation and experimental data, the law of the influence of temperature on the PD signal of GIS insulation voids was summarized, and the mechanism of the influence was analyzed. The results showed that the multiscale fusion simulation method of GIS insulation void PD signals proposed in this paper is consistent with the experimental results, which can provide a reference for the digital twin model of power equipment status.

Stage division strategy for gas insulation surface discharge based on multi-physical information

“…The phenomenon that the discharge amplitude increases with phase in the half cycle of AC voltage in the spectrum is also related to the recovery effect caused by residual positive ions in the streamer channel after discharge [12]. In addition, according to literature [13], there are obvious differences in the morphology of the positive and negative half cycle discharge channels along the surface discharge.…”

Distributed optical fiber sensing technology in operation status monitoring of GIL equipment

“…𝐸 ⃗ 𝑠 (𝑧, 𝑡) = 𝐴 𝑠 (𝑧, 𝑡)𝑒 𝑗(−𝑘 𝑠 𝑧−𝜔 𝑠 𝑡) + 𝑐𝑐 (10) Similarly, the equation for the fluctuation of the sound field on the density distribution of the medium material is:…”

“…Generally, a partial discharge aura will appear before the fault occurs in GIL [7]- [8]. In some special cases, the partial discharge phenomenon may last for months or even longer, and each occurrence of partial discharge will cause a certain degree of damage to the equipment insulation, this damage keeps accumulating and eventually leads to complete damage to electrical equipment [9]- [10].…”