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Transient Enclosure voltage is special case of very fast transient over voltages which occurs due to disconnect switch operation or earth ground. Transient Enclosure Voltage appears on external of earthed enclosure of Gas Insulated Systems. Despite of proper grounding, this phenomenon indicates presence of high potentials on Gas Insulted System enclosures so the grounding system impedance is thoroughly...
There are some special characteristics on over-voltage protection due to GIS substation itself. And for 500kV ultra high voltage network, some problems such as lightning over-voltage protection and the arrangement of arresters are needed to be solved. Taking a 500kV GIS pumped-storage power station as sample, this paper uses graphic electromagnetic transient calculation program ATPDraw, synthesizes...
This paper presents a new appraisal for the utilization of series spark gaps with metal oxide surge arresters aiming at networks with resonant grounding. For these networks, single phase faults can lead to enduring overvoltages on the sound phases, stressing equipments like arresters. Usually, this is not a problem when the network is planned to operate with resonant grounding. But the situation changes...
Overvoltages arising in 150 kV and 400 kV GIS substations due to backflashover of the incoming overhead transmission lines were computed with the aid of ATP-EMTP simulations, by considering the effects of several simulation models of the basic transmission line components. The protection offered against impinging surges by surge arresters operating at the substation entrance is evaluated with respect...
This paper combines incoming lines with 500 kV GIS substation, considering the influence of the impulse voltage-second characteristics of insulator strings, the impulse corona of incoming lines, the impulse grounding resistance of tower and the position of lightning. ATP-EMTP simulation program is applied to analyze the lightning over-voltage of 500 kV GIS substation. The result shows that impulse...
The paper summarizes produce over voltage principle of 110 KV main transformer central point and problem in protect mode, suggest has grounding protection of low reactance and this method could protect main transformer in 110 KV transformer substation effectively.
This paper describes the design and layout problems encountered in the construction of a substation for the largest series capacitor installation in operation to date. Companion papers1,2 cover the application and equipment design of the series capacitor.
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