Diagnostic analysis and protective measures of transient ground potential rise in a 1000 kv UHV substation

The Journal of Engineering

Yubo Yuan¹  Fubin Pang¹  Qiangsheng Bu¹  Yu Liu¹ 

[1] State Grid Jiangsu Electric Power co. Ltd. Research Institute;

关键词: power grids;    substation protection;    switchgear protection;    control cable;    control cabinet;    electromagnetic lock;    electromagnetic disturbance;    GPR;    switchgear operation;    protective measures;    diagnostic analysis;    transient ground potential rise;    power grid capacity;    voltage levels;    startup operation;    ground copper bar;    UHV substation;    transmission paths;    Taizhou ultra-high voltage substation;    signal characteristics;    control wires;    conductive metal cube;    GPR disturbance;    locally installed equipment protection;    grid safety;    voltage 1000.0 kV;    voltage 500.0 kV;   

DOI  :  10.1049/joe.2018.8638

来源: DOAJ

【 摘 要 】

With the continuous expansion of power grid capacity and growth of voltage levels, the transient ground potential rise (GPR) caused by the switchgear operation has become great threaten to the safety of the grid. In the startup operation of 500 kV part of Taizhou 1000 kV ultra-high voltage (UHV) substation, the electromagnetic lock installed in the switchgear filed was broken by the GPR in case of switchgear operation. There are two possible transmission paths of the GPR, one is the ground copper bar connecting the ground and the other is the control cable connecting the control cabinet and electromagnetic lock. In order to find out the transmission path of the electromagnetic disturbance, the experiment is carried out to distinguish the two possible paths. The waveform of the GPR in case of switchgear operation from different measuring points are recorded and compared, the results are analysed by comparing the signal characteristics and the transmission path is eventually diagnosed. Finally, the protective measures are proposed by wrapping the control wires with the conductive metal cube to reduce the influences of GPR. The outcomes in the study provide beneficial methods to analyse the GPR disturbance and positive guidance for the protection of locally installed equipment.

【 授权许可】

Unknown