Construction of 8000 A class 275 kV gas insulated transmission line

Kuroyanagi, Yukio; Toya, A.; Hayashi, T.; Araki, Toru

doi:10.1109/61.107249

Cited by 16 publications

(1 citation statement)

References 3 publications

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“…The conductor is held in the center of the enclosure by using basin-type insulators and post insulators. A gas mixture of nitrogen (N 2 ) and sulfur hexafluoride (SF 6 ) is filled in the tubes as insulating medium [8,9]. Usually, a UHV power transmission system is constructed across every long distance, and overhead transmission lines cannot be built in some circumstances, such as crossing a wide river, a mountain or metropolitan areas [10].…”

Section: Introductionmentioning

confidence: 99%

Transient Voltage UWB Online Monitoring System for Insulation Failure Analysis and Fault Location of GIL

Zhang

Ding

et al. 2021

Energies

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Transient voltage generated in ultra-high voltage (UHV) transmission system has a severe impact on the insulation state of gas-insulated transmission lines (GIL). In order to monitor the transient voltage process occurring in UHV GIL during operation, this paper constructs a transient voltage ultra-wideband (UWB) online monitoring system based on capacitive voltage division. This system has been applied in an 1100 kilovolt (kV) GIL utility tunnel project. It can be used to analyze the characteristics of the recorded transient voltage waveforms for distinguishing different types of insulation failure. In this paper, through the case studies in time domain and time–frequency domain, the case of SF6 gap breakdown and that of post insulator flashover have differentiated characteristics in instantaneous frequency. Additionally, a case of secondary discharge is successfully estimated through the time–frequency distribution of the transient voltage. In order to find the malfunctioning chamber of GIL rapidly, a two-terminal TW-based fault location method based on this monitoring system is developed in this paper. The case study validates the locating accuracy which directly support for shortening the maintenance time of GIL.

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Section: Introductionmentioning

confidence: 99%