Mitigation of transient ground potential rise in gas insulated substations during very fast transient overvoltage

Study on fast transient overvoltage characteristics of substation under UHV disconnector operation

“…The above three methods are used to suppress the overvoltage of substations, respectively, and a comparison of the simulation curves of specific voltage changes is shown in Figure 2. The method in this paper Reference [6] method Reference [7] method Each method has its own peak value Figure 2 shows that when the operating time of the substation is 2.2 seconds, a high fast transient overvoltage occurs internally, and all three methods reach the peak. Compared with the control group, the fast transient overvoltage in this method is better suppressed, which can ensure the amplitude reduction of the fast transient overvoltage level and effectively suppress the problem of high internal steady-state voltage, thereby improving the operational capacity of the substation project.…”

“…The comparison results are shown in Figure 3. The method in this paper Reference [6] method Reference [7] method Each method has its own peak value As shown in Figure 3, due to the increased rated power of the substation, the peak level of overvoltage increases, the dissipation time of overvoltage is prolonged, and the system needs a longer time to return to its normal working state.…”

“…As shown in Figure 1, the simulated substation project has a total of 10 outgoing lines, which are connected with switches A, B, C, D, and E respectively, and relevant parameters are set in the near areas of the substation K1, K2, K3, K4, and K5. According to the above experimental environment and scheme, in order to verify the superiority of the method in this paper, reference [6] method and reference [7] method are selected as experimental control group A and experimental control group B. In this study, the main equipment parameters of the substation are configured, as shown in Table 1.…”

“…In order to ensure the normal operation of the UHV disconnector and reduce the adverse impact of transient overvoltage on the substation, it is necessary to study the related characteristics. In [6], the transient ground potential rise relief characteristics of gas-insulated substations were studied during rapid transient overvoltage. The partial element equivalent circuit numerical method was used to evaluate and alleviate the transient response of the gas-insulated substation grounding network to voltage breakdown faults.…”

Evaluation of the Direct-Stroke Shielding Performance of Substations Through Stochastic Modeling of Lightning Attachment

“…Substations, critical part of a power system, shall operate with high reliability and experience a practically zero outage rate [4]. Thus, lightning-related studies regarding the direct-stroke shielding system design to substations and analysis of the arising surge overvoltages at substation have been a subject of extensive research [5], [6], [7], [8], [9], [10].…”