Results 31 to 40 of about 188 (115)

Nanocrystalline based Mitigation Technique for Very Fast Transient over Voltages in Gas Insulated Substations [PDF]

, 2021
: in gas insulated substations, issue of very fast transient over voltages is very familiar problem because of its effects on live ultra-high voltage equipment.
et. al., R.Durga Rao,
core   +1 more source

Characteristics of very fast transient currents in ultra high-voltage power system with hybrid reactive power compensation [PDF]

, 2018
Hybrid reactive power compensation (HRPC) consists of a stepped controlled shunt reactor (SCSR) and a series compensation (SC), which will find applications in future ultra high-voltage (UHV) power grids to resolve the problems due to the frequent change
Chen, Taiyu, Han, Mingming, Li, Qingquan, Liu, Hongshun, Siew, Wah Hoon, Sun, Qiuqin   +5 more
core   +1 more source

New mitigation methods for transient overvoltages in gas insulated substations [PDF]

, 2012
During switching of disconnectors (DS) in GIS a varying number of pre-strikes and re-strikes occur. Due to the very short duration of the voltage collapse, traveling surges are generated in the busbar duct.
Burow, Simon, Köhler, Wolfgang, Riechert, Uwe, Tenbohlen, Stefan   +3 more
core   +1 more source

New equivalent circuit model of UHVDC converter transformer winding for surge propagation investigation

The Journal of Engineering, Volume 2019, Issue 16, Page 2921-2925, March 2019., 2019
An accurate computational model of transformer winding for potential distribution analysis under impulse voltage is very important for the design of transformer inter‐turn insulation, especially for large capacity transformers such as ultrahigh‐voltage DC (UHVDC) converter transformer.
Shuang He, Yuhao Liu, Zheng Zhao, Chenjie Li, Yifeng Wang, Ziyuan Ren, Hai Qian, Jun Deng   +7 more
wiley   +1 more source

Interference Analysis of Very Fast Transient Overvoltages in Gas-Insulated Substations Using a Hybrid Algorithm

Sukkur IBA Journal of Emerging Technologies
The reliable and efficient computational approach for the cable interference in gas insulated substations (GIS) is presented. The hybrid domain decomposition method-multilevel fast multi-pole algorithm (DDM-MLFMA) is presented herein.
Muhammad Bilal, Hafiz Muhammad Azib Khan, Abdul Mueed, Kamran Liaqat Bhatti, Syed Safdar Raza, Muhammad Siddique   +5 more
doaj   +1 more source

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

The Journal of Engineering, Volume 2019, Issue 16, Page 1144-1148, March 2019., 2019
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 ...
Fubin Pang, Qiangsheng Bu, Yu Liu, Yubo Yuan   +3 more
wiley   +1 more source

Necessity of overvoltage protection studies for gas-insulated switchgear [PDF]

, 2017
Kaasueristeisten kytkinlaitosten määrä kantaverkossa lisääntyy tulevaisuudessa merkittävästi erityisesti korvausrakentamisen myötä. Kaasueristeinen kojeisto on herkkä ylijännitteille ja aiheuttaa vikaantuessaan pitkän keskeytyksen sähkönsiirtoon sekä ...
Anthony, Laura G, Goodman, Michael, LaKind, Judy S   +2 more
core   +3 more sources

A novel GIS breakdown location method based on natural frequency of transient voltage

High Voltage, Volume 10, Issue 4, Page 856-875, August 2025.
Abstract During on‐site withstand voltage tests of gas‐insulated switchgears (GIS), once a breakdown occurs, it is hard to locate the breakdown position due to the intricate branch structures and minimal breakdown energy. The existing methods may require the placement of a large number of sensors with unsatisfactory accuracy, which adversely affects ...
Qiang Sun, Dengwei Ding, Yanpeng Ge, Ziwei Zhang, Wensheng Gao, Weidong Liu, Ke Zhao, Bo Liu, Lei Wang, Jiaqi Qu   +9 more
wiley   +1 more source

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

IEEE Access, 2019
On-line condition monitoring and real-time fault detection are essential to protect power transformers from unscheduled outage of services. The core earth signals (CES) are valuable for fault detection and diagnosis of power transformers, as they are ...
Xuezhi Ke, Lisheng Pang, Xiang Dong, Zhaohui Li   +3 more
doaj   +1 more source

Research on the fitting method to describe the mathematical expression of VFTO in GIS

The Journal of Engineering, Volume 2019, Issue 16, Page 2053-2057, March 2019., 2019
Very fast transient over voltage (VFTO) is a unique electromagnetic transient phenomenon occurring in Gas Insulated Substation (GIS), which determines the insulation level of the GIS (above 330 kV). Unfortunately, up to the present, there is no standard VFTO waveform to test the high voltage equipment to ensure the safety of power grid. For this reason,
Reem A. Almenweer, Su Yixin, Wu Xixiu
wiley   +1 more source