Flashover and Surface Charge in GIL Insulator

Flashover and Surface Charge in GIL Insulator

DOI: 10.4018/978-1-5225-8885-6.ch002

Abstract

Many works have been studies in order to improve flashover voltage in GIL insulator. Under DC, the insulator electric field is decided by the conductivity and surface charge distribution. This chapter takes cone-type insulator as research object and then finds the characteristics of flashover, surface charge accumulation, and the interface electric field regulation (IER) of epoxy (EP)-/graphene (GR)-coated insulator. Theoretical analysis demonstrates that the uniform surface charge of monopole is conducive by reduce peak field and flashover voltage. Among them, that of 0.1% EP/GR possesses the highest flashover voltage. With the SiC content and coating thickness enhancement of IER insulator, the electric field regulation of EP/SiC-coated insulator becomes notable, due to energy loss and increasing leakage current. The results show that insulator coated by EP/SiC can reach higher flashover voltage than uncoated insulator and enhanced SiC content contributes to improve the flashover voltage.
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Surrounding Insulating Gas

In the AC system, the regulation of dielectric constant of GIL insulator is by a great number of studies. Recently, a large number of researches has emphasized the functionally graded material (FGM) (Kato, 2006; Hayakawa, 2016). The FGM insulators that have the characteristic of spatial permittivity (ɛ-distribution) can be processed through 3D printing technique, the lamination and the centrifugation method. Through flashover test under lighting impulse voltage, it can be found that the breakdown voltage (BDV) of FGM insulator is significantly higher than conventional insulator.

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