CHANG Linjing, XU Guanghui, XU Jiantao, et al. Numerical Solution of Surface Field and Checking of the Onset Field on the Fittings Inside in ±1 100 kV UHVDC Valve Hall[J]. High voltageapparatus, 2018, 54(6): 87-92+100.
CHANG Linjing, XU Guanghui, XU Jiantao, et al. Numerical Solution of Surface Field and Checking of the Onset Field on the Fittings Inside in ±1 100 kV UHVDC Valve Hall[J]. High voltageapparatus, 2018, 54(6): 87-92+100. DOI: 10.13296/j.1001-1609.hva.2018.06.013.
Numerical Solution of Surface Field and Checking of the Onset Field on the Fittings Inside in ±1 100 kV UHVDC Valve Hall
To check corona inception state of the fittings in ±1 100 kV UHVDC converter station valve hall
a 3D model of the fittings is built on the basis of the engineering drawing of a ±800 kV converter station valve hall and the initial design of a ± 1 100 kV converter station valve hall. The whole electric field distribution is obtained by using the instantaneous potential loading method of electrostatic field
and the submodeling method is employed to achieve precision solution of local electric field. According to the obtained result
the corona state of tube and spherical fittings are checked by means of peek formulation and the experimental data
and the corona-sensitive fittings are optimized. The calculated results indicate that the fittings in this valve hall have certain safety margin
and the spherical equalizing fittings for the bushing below phase C on the D side of converter transformer is most possible to induce corona
so it is suggested to change the fittings into double-ring type.