The Development and Practical Use of A New 24 kV Dry Air Insulated Switchgear

Yoshida, Tsuneo; Yano, Tomotaka; Tohya, Nobumoto; Inoue, Naoaki; Arioka, Masahiro; Sato, S.; Takeuchi, Toshie

doi:10.1541/ieejpes.126.359

Cited by 16 publications

(7 citation statements)

References 2 publications

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“…In these days, most of the medium voltage switchgears are the cubicle-type low pressure SF6 gas insulated switchgears (C-GIS). However, SF6 gas was designated as one of the targets of emission control in the global warming prevention conference held in 1997 (COP3), then research and development of SF6 gas free systems are advanced actively [1][2][3][4][5][6]. In the medium voltage class, the switchgears insulated with high pressure air or nitrogen has been developed [3] On the other hand, research and development of technological components aiming for the realization of a full solid insulated substation is advanced actively in the extra high voltage class.…”

Section: Introductionmentioning

confidence: 99%

“…Under the situation mentioned above, a solid insulated switchgear (SIS), in which main circuit including a vacuum interrupter are coated with epoxy resin, has been developed [2]. However, improvement of the surface insulation performance of the solid/gas composite insulation system is required for the development of higher stress and compact design.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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Solid insulated switchgear (SIS) has been developed as a substitution for medium voltage sulfur hexafluoride (SF6) gas insulated switchgears. Its main circuit including a vacuum interrupter is coated with epoxy resin. Therefore, a solid/gas insulation system is composed. For further miniaturization and higher stress design of SIS, improvement of the insulation performance is required. In the solid/gas insulation system, the breakdown strength along the surface is lower than that of solid. Then, the authors investigated the surface insulation performance of the solid/gas insulation system containing an embedded electrode. In the present study, the sizes of the embedded electrode and the solid insulation material were varied and the partial discharge inception voltage and the surface breakdown voltage were measured. As a result, it was found that the surface breakdown voltage varied considerably with the radius of the embedded electrode. From the result, it was deduced that the surface insulation performance could be improved by choosing the size of the embedded electrode appropriately. Moreover, the effects of the thickness of the insulation material and of the surface distance on the surface insulation performance were clarified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Yamashita

Iwanaga

Furusato

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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“…This paper describes PD detection characteristics of the PD monitoring system developed for our new C-GIS products in which a compressed dry air, known as a greenhouse gas [4]- [6], is used as insulation. The shield conductor embedded in bushing is utilized as a PD sensor and the sensitivity is investigated in the frequency range from VHF to UHF.…”

Section: Main Conductormentioning

confidence: 99%

Partial discharge monitoring system for cubicle type GIS

Tsurimoto

Yoshimura

Muto

et al. 2008

2008 International Conference on Condition Monitoring and Diagnosis

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Partial discharge (PD) monitoring system for cubicle type gas-insulated switchgear (C-GIS) filled with compressed dry air as an insulation gas was developed. The shield electrodes embedded in the solid insulator of bushings are used as PD sensors. For verification of the sensitivity of the sensors and propagation characteristics of PD pulse, artificial defects such as fixed particle on high voltage conductor and defect on creepage surface of insulator in C-GIS were used. It is clarified that the sensors had good sensitivity to PD pulse propagating along high voltage conductor in the range from VHF to UHF and that the amplitude of the sensor output had good correlation with apparent charge, pC, detected by conventional PD detector. The PD monitoring system is connected with our condition based maintenance (CBM) controller, which also monitors the abnormality of circuit breaker, disconnecting switch, gas pressure and so on, as a total diagnosis tool for our C-GIS.

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“…On the other hand, we have developed the electromagnetically actuated vacuum circuit breaker (VCB) for the improvement of reliability by reducing the number of parts and planned to launch it into market [2,3]. To achieve CBM for the VCB, a monitoring device to monitor state of device and a system to diagnose monitoring result are indispensable.…”

Section: Introductionmentioning

confidence: 99%

Development of Mechanical CBM System for Electromagnetically Actuated Vacuum Circuit Breaker

Yano

Matsunaga

Arioka

et al. 2017

Elect Comm in Japan

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A new mechanical CBM (condition-based maintenance) system for an electromagnetically actuated vacuum circuit breaker (VCB) has been developed. This CBM function has a new monitoring method using analysis of the coil current profile of the actuator operation. The VCB has three sets of vacuum interrupters, insulating rods, contact pressure springs, and electromagnetic actuators. The electromagnetic actuators control each phase independently. We have clarified the variation in the actuator's current profile by the developed analytical method when the valve of friction, contact erosion, and driving capacitance change. We have established a diagnostic method for the mechanical condition using this current profile analysis. With this method, a new remote monitoring system of the mechanical condition using current monitors on the actuator's controller has been developed and mounted on VCB for cubicle-type gas insulated switchgears rating from 7.2 kV to 84 kV. The maintenance for mechanical parts of VCB changes to the CBM system from the conventional TBM (time-based maintenance) system using this monitoring system. The developed mechanical CBM system significantly reduces the life cycle cost including the labor cost of maintenance. C⃝ 2017 Wiley Periodicals, Inc. Electron Comm Jpn, 100(2): 50-57, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

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The Development and Practical Use of A New 24 kV Dry Air Insulated Switchgear

Cited by 16 publications

References 2 publications

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Improvement of insulation performance of solid/gas composite insulation with embedded electrode

Partial discharge monitoring system for cubicle type GIS

Development of Mechanical CBM System for Electromagnetically Actuated Vacuum Circuit Breaker

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