644 / 2022-03-30 23:40:15

A Novel Measurement Method for Charge Dissipation Along the Surface

Surface Charge,Charge Dissipation,Measurement Method,Metal Particle

A Novel Measurement Method for Charge Dissipation Along the Surface

Zhuodong Yang¹, Bo Qi¹, Xiao Yang¹, Yuan Luo¹, Yi Zhang¹, Caixin Sun², Chengrong Li<sup>1

1</sup> State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China

² China Huaneng Group Co.,Ltd., Guangzhou, China

lqicb@163.com

Purpose/Aim

In UHV gas insulated equipment, the surface insulation characteristic of insulators plays a significant role. The surface charge is one of the important factors of failure. The surface charge dissipation characteristics will change with the changed surface state. However, the existing surface potential dissipation (SPD) method cannot effectively measure the dissipation characteristics along the surface. Therefore, in order to characterize the charge dissipation caused by the change of surface state, a novel measurement method is proposed and its theory is analyzed.

Experimental/Modeling methods

Referring to the method of surface conductivity measurement, a ground electrode is set on the epoxy surface to enhance the way of charge dissipation along the surface. In this paper, the surface charge dissipation characteristics and trap distribution characteristics of epoxy with or without metal particles are compared.

Results/discussion

With the change of surface state, the charge dissipation characteristics and trap distribution characteristics obtained by the existing methods can not reflect the difference. However, the result by improved method shows that the speed of dissipation is much faster than that of initial surface state.

Conclusions

The novel measurement method effectively enhances the way of charge dissipation along the surface. The charge dissipation characteristic of different surface state is efficiently characterized. This experimental method with its mechanism has a contribution to the future study of surface insulation characteristic with different surface state.

A Novel Measurement Method for Charge Dissipation Along the Surface

Zhuodong Yang¹, Bo Qi¹, Xiao Yang¹, Yuan Luo¹, Yi Zhang¹, Caixin Sun², Chengrong Li<sup>1

1</sup> State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China

² China Huaneng Group Co.,Ltd., Guangzhou, China

lqicb@163.com

Purpose/Aim

In UHV gas insulated equipment, the surface insulation characteristic of insulators plays a significant role. The surface charge is one of the important factors of failure. The surface charge dissipation characteristics will change with the changed surface state. However, the existing surface potential dissipation (SPD) method cannot effectively measure the dissipation characteristics along the surface. Therefore, in order to characterize the charge dissipation caused by the change of surface state, a novel measurement method is proposed and its theory is analyzed.

Experimental/Modeling methods

Referring to the method of surface conductivity measurement, a ground electrode is set on the epoxy surface to enhance the way of charge dissipation along the surface. In this paper, the surface charge dissipation characteristics and trap distribution characteristics of epoxy with or without metal particles are compared.

Results/discussion

With the change of surface state, the charge dissipation characteristics and trap distribution characteristics obtained by the existing methods can not reflect the difference. However, the result by improved method shows that the speed of dissipation is much faster than that of initial surface state.

Conclusions

The novel measurement method effectively enhances the way of charge dissipation along the surface. The charge dissipation characteristic of different surface state is efficiently characterized. This experimental method with its mechanism has a contribution to the future study of surface insulation characteristic with different surface state.