765-kV Transmission Line Insulation: Testing Program

Hauspurg, A.; Caleca, Vincent; Schlomann, R. H.

doi:10.1109/tpas.1969.292526

Cited by 13 publications

(1 citation statement)

References 6 publications

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“…The clearance is a little larger than that of AEP 765 kV transmission line [4] and less than that of HQ 735 kV transmission line [5]. The phase-to-phase minimum clearance is 8500 mm according to the CRIEPI's experimental formula and switching overvoltage of 3.3 p.u.…”

Section: ) the Minimum Air Clearancementioning

confidence: 99%

Switching overvoltage analysis and air clearance design on the KEPCO 765 kV double circuit transmission system

Kim

Shim

2000

IEEE Trans. Power Delivery

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This paper presents the results of the air clearance design on the KEPCO 765 kV double circuit transmission system. At first we performed the switching overvoltage study. The switching overvoltage was analyzed by EMTP (Electro-Magnetic Transient Program) and TNA (Transient Network Analyzer). The full scale test for the air insulation strength of 765 kV double circuit transmission tower was performed by 4 MV outdoor impulse generator. The simultaneous fault clearing case of single line-to-ground fault at each circuit was considered because the probability of simultaneous single line-to-ground fault at each circuit is very high. However, the reclosing overvoltages with preinsertion resistor are lower than the simultaneous fault clearing overvoltages when the transmission line is short (about 170-180 km). The maximum phase to ground switching overvoltage in the simultaneous fault clearing case is 1.9 p.u. and the maximum switching overvoltage between phase to phase is 3.3 p.u. The required air clearance in a tower at the altitude of below 1000 m is 4950 mm to endure the maximum switching overvoltage of 1.9 p.u. The standard deviation of 5% in switching surge flashover voltage was verified from the full scale test.

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Section: ) the Minimum Air Clearancementioning

confidence: 99%