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As alternating current filter (ACF) sub-bank circuit breakers in DC transmission projects have been switched frequency and withstood AC/DC hybrid over-voltage, it is necessary to research the selection of characteristic parameter of ACF sub-bank circuit breakers in order to guarantee the safe operation. Operation and maintenance data in China Southern Power Grid Company Limited of the latest 15 years...
Biological growth has been observed on insulators installed all over the world. However its impact on the electrical performance is not well known. This paper described the investigations on the performance of post insulators with biological growth at a converter station. Both the ceramic and composite insulators were investigated. Two kinds of biological agents, lichen and mold were found on the...
The lumped equivalent circuit parameters and distributed parameters of a line at high frequency are a little different from those at power frequency, because of distribution effects. The paper derives the formulas to get the lumped equivalent circuit parameters and distributed parameters from open circuit and short circuit harmonic impedance, and the actual measurement was carried out on a three phases...
The existing controllable spark gap has not been able to be widely applied to the high voltage grid so far mainly due to the constraint of reliability. This paper introduces a conceptual design of a new type of controllable multi-spark gap which improves the reliability dramatically on working principle. The multi-spark gap is composed of multiple air gaps and chained R-C network for producing frequency-dependent...
Corona onset voltage is an important parameter corresponding to corona characteristics. Existing onset voltage measurement methods can not distinguish the partial onset voltage and the onset voltage of transmission conductor. Based on analyzing corona onset and development process, a novel estimate method using current coefficient was presented to estimate DC onset voltage in this paper. The current...
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