79 / 2022-03-11 08:13:58

Research on optimal layout of lightning arrester in AC side incoming section of ± 800kV UHV converter station

± 800kV,,UHV converter station,back flashover overvoltage,shielding failure overvoltage,lightning intruding wave

Purpose/Aim

UHVDC converter station requires reliable lightning protection measures. At present, there is no existed standard to describe how to layout the arresters in AC side incoming section of ± 800kV UHV converter station. Based on Butuo converter station of the UHVDC project from Zhejiang to Jiangshu, this paper researched the optimal layout scheme of the arresters installed on the incoming section.

Experimental/Modeling methods

When carrying on the study on optimal layout of lightning arrester in AC side incoming section of ± 800kV UHV converter station, back flashover overvoltage and shielding failure overvoltage should be simulated. In this paper, the simulation program of ATP-EMTP is used and the deterministic method is adopted.

Results/discussion

For AC side incoming section of ± 800kV UHV converter station, when the distance between the arrester and the shunt reactor is 71m, the overvoltage cannot satisfy the lightning protection requirement. When the distance between the arrester and the shunt reactor is 8m, the overvoltage can satisfy the lightning protection requirement.

Conclusions

When AC side incoming section of ± 800kV UHV converter station is installed with the shunt reactor, the arrester should be installed near the shunt reactor instead of being installed near the equipments in the AC side of ± 800kV UHV converter station.

Appendix (Figure, table, image…)

Overvoltage Comparison of  two arrester installation schemes

The distance between the shunt reactor and the arrester  /m	Operation method	Maximum lightning overvoltage  /kV	Insulation requirement /kV	Satisfied with the requirement or not
71	Full line	1510	1457	Yes
8	Two line-one transformer	1160	1457	No