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It is necessary to research live working on UHV electrode line, so as to support DC UHV maintenance. As the electrode line of Zhengzhou converter station for example, the ground faults overvoltage on BP and GR modes were calculated. The maximum switching overvoltage was 288kV under the condition of live working. It was determined by the grounding fault of high end YY converter valves. The switching...
The reliability of UHV transmission system is important to the power grid and live working technology is a key method to cope with line components defects or fault without outage plan. In order to satisfy the design requirement of the UHV compact transmission lines, and to provide parameters for live line maintenance on those transmission lines, the air gaps switching impulse voltage discharge tests...
Live working technology is to ensure the safe operation of UHV transmission lines is an important technical means, and the security and stability to equal-potential is a key link for live working. UHV line tension insulator string length, the distance between united and dip Angle, etc is bad for workers along the insulator into the equal-potential. For workers from jumping into the equal-potential...
110kV Composite Material Pole has many advantages over traditional steel towers and concrete poles to enhance the operation reliability of power system. The grounding methods has obvious effect on the phase-ground insulation performance of composite materials pole of 110 kV transmission line. Four grounding methods of 110 kV composite materials pole were investigated in this paper, which including...
This work proposes a bi-direction hydrogen amorphous silicon (a-Si:H) gate driver circuit, which can be properly applied to the active-matrix liquid-crystal displays with integrated touch panels. The fluctuations of display control signals increase the noise of the touch panel during touch sensing period. To solve this problem, the proposed circuit allows the LCDs to pause at any column until the...
Single-walled carbon nanotubes (SWCNTs) have been synthesized by an arc discharge method using asphalt and petroleum coke as the ?carbon sources. The morphology and structure of the SWNT products synthesized with iron (Fe) as the catalyst were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, and energy dispersive X-ray...
The switching impulse discharge performances of live working electric structure on outer phase, middle phase and tension string in 1000kV AC transmission line were studied. And based on the results, by calculation and analysis of the risk of live working, the minimum approach distance for live working was determined.
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