Results 31 to 40 of about 940 (189)
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 +9 more
wiley +1 more source
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 +3 more
wiley +1 more source
High Voltage, Volume 9, Issue 6, Page 1202-1207, December 2024.Abstract The submodule in multilevel modular converters experiences a very fast transient overvoltage (VFTO) during switch operation of gas‐insulated switchgear, which also results in overvoltage on power devices, such as thyristors and insulated gate bipolar transistors (IGBTs). This work presents an embedded circuit that utilises a gap in conjunction
Hong Shen +7 more
wiley +1 more source
High Voltage, Volume 9, Issue 4, Page 773-785, August 2024.Abstract In the past three years, a number of oil‐immersed ultra‐high‐voltage shunt reactors have experienced discharge defects when being put into operation, resulting in an overload of acetylene. However, detecting and identifying these discharge defects caused by switching impulse voltage is challenging under steady‐state conditions.
Simeng Li +5 more
wiley +1 more source
The Journal of Engineering, Volume 2019, Issue 16, Page 3337-3340, March 2019., 2019 The Rogowski coil current transformer is widely used in intelligent substations for its rapid response, wide bandwidth measurement, and non‐magnetic saturation. In most cases, it works with a digital integrator to restore the differential signal output by the coil.
Fubin Pang +3 more
wiley +1 more source
A Review of Research Progress in Very Fast Transient Overvoltage (VFTO) Suppression Technology
EnergiesThe very fast transient overvoltage (VFTO) is characterized by steep wavefronts, high amplitude, and wide spectrum. These characteristics can lead to partial discharges or insulation breakdowns in potted insulators, which can lead to localized ...
Huan Wang +3 more
doaj +1 more source
IET Generation, Transmission &Distribution, Volume 18, Issue 8, Page 1611-1623, April 2024.This paper proposes a peak time of voltage travelling wave‐based protection scheme for DN with distributed generators using FRs as line boundary. Numerical simulation and experimental results verify that the proposed method can quickly and sensitively distinguish internal and external faults, and has high resistance to transition resistance.
Zhongxue Chang +3 more
wiley +1 more source
Modelling and validation of metal oxide surge arrester for very fast transients
High Voltage, Volume 3, Issue 2, Page 147-153, June 2018., 2018 Metal oxide surge arrester models that are currently on rounds suffer from certain deficiencies and as a consequence, they are not in position to portray accurately the arrester residual voltages. This drawback is mainly attributed to their inherent features.
Kannadasan Raju, Valsalal Prasad
wiley +1 more source
High Voltage, Volume 9, Issue 1, Page 150-162, February 2024.Abstract As voltage measuring devices are widely used in the high voltage power system with a primary‐secondary‐fusion structure, electronic voltage transformers are directly connected to the primary conductor and would face much more serious electromagnetic environments than general secondary equipment.
Houda Zhu +5 more
wiley +1 more source
Gaoya dianqi, 2020 GIS隔离开关在操作过程中会产生VFTO,对设备的安全稳定运行构成威胁,因此,研究隔离开关操作过程中VFTO的抑制措施具有重要意义。文中首先开展了隔离开关操作顺序对VFTO影响的理论分析,以某抽水蓄能500kVGIS由于VFTO引起的故障案例,通过仿真计算分析了优化操作顺序降低VFTO的效果。最后,对该措施的进一步推广应用进行了展望。
刘凯 +6 more
doaj