Results 1 to 10 of about 272 (79)
High Voltage, 2019 Determining the voltage ratio change is one of the core issues in the traceability of the DC voltage divider. Basing on the previous research results, this study proposes an improved DC voltage summation method to evaluate the voltage division ratio ...
Dengyun Li +5 more
doaj +1 more source
The Journal of Engineering, 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.
Fubin Pang +3 more
doaj +1 more source
Study on lightning overvoltage and commutation failure in UHV AC/DC hybrid system
The Journal of Engineering, 2019 Due to the high UHV AC/DC transmission line tower, the working voltage amplitude on the wire is large, causing lightning accidents. The paper first analyses the impact of lightning strike point on lightning overvoltage of 1000 kV UHV transformer ...
Shengwei Fang +4 more
doaj +1 more source
The Journal of Engineering, 2019 In hierarchically connected UHV DC projects, the 1000 kV AC filter sub-bank in converter station is provided with two 500 kV circuit breakers. To determine the test DC component decay time constant when breakers break short-circuit current, relevant DC ...
Li Zhenqiang +3 more
doaj +1 more source
Research on overvoltage and fault of a UHV AC/DC hybrid system
The Journal of Engineering, 2019 In view of the overvoltage problem of an ultra-high-voltage DC (UHVDC) AC/DC hybrid system, this study analyses the overvoltage condition under various fault types and gives the identification criterion of the overvoltage form. Firstly, the model of the
Yali Wang +3 more
doaj +1 more source
Research on optimisation of minimum air clearance of 1000 kV UHV AC substation
The Journal of Engineering, 2019 Based on air clearance discharge characteristic curve and insulation coordination method, it is pointed out that the minimum air clearance of 1000 kV ultra-high voltage (UHV) AC substation can be further optimised.
Li Zhenqiang +3 more
doaj +1 more source
The Journal of Engineering, 2019 In the hierarchically connected ultra-high voltage (UHV) DC projects, the minimum air clearance on the 1000 kV AC side of converter transformer directly affects the layout and area of the valve hall.
Lou Ying +3 more
doaj +1 more source
The Journal of Engineering, 2019 With the rapid development of China's power grid, it is becoming increasingly common that the multi-circuit overhead transmission lines cross over each other.
Feng Huo +4 more
doaj +1 more source
The Journal of Engineering, 2019 The current standards related to live working provide no determined path for equal potential working, in which only safety distance is referred, so that the works are often executed relying on the line maintenance experience.
Bing Zhang +6 more
doaj +1 more source
An eco-friendly separation-based framework for quantitative determination and purity testing of an antihypertensive ternary pharmaceutical formulation. [PDF]
BMC Chem, 2023 Marzouk HM +3 more
europepmc +1 more source