• Title, Summary, Keyword: High voltage GIS

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Mechanical Fracture Characteristic of Epoxy Insulation Barrier for High Voltage GIS (초고압 GIS용 에폭시 절연물 배리어 파단 특성)

  • Suh, Wang Byuck
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.10
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    • pp.641-645
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    • 2017
  • In this study, an epoxy insulation barrier for high voltage GIS was developed using epoxy and a filler with a Young's modulus of 11 GPa. The material was investigated using a simulation of the principal stress, displacement, and safety factors while optimizing the profile shape. The simulation showed that thelarger Young's modulus of the $Al_2O_3$ filler compared to the $SiO_2$ in the epoxy insulation can contribute to an increase in resistance to mechanical fracturing for theoptimized profile barrier in high voltage GIS. In addition, the safety factor was improved by 10%. It can be concluded that the mechanical fracturing properties of the insulation barrier can be enhanced by increasing the content of the elastic filler, $Al_2O_3$, for high voltage GIS applications.

A Study on Electrical and Mechanical Properties of Epoxy Insulation Barrier for High Voltage GIS Using a Filler of SiO2 and Al2O3 (SiO2와 Al2O3를 충진재료로 사용하는 초고압 GIS용 에폭시 절연물 베리어의 전기적 및 기계적 특성에 관한 연구)

  • Suh, Wang-Byuck;Bae, Dong-Ho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.6
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    • pp.379-383
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    • 2015
  • Some insulating materials are organized and analyzed with variables to obtain the optimized profile of encapsulated three phase of epoxy barrier which is applied to gas compartment and supporting conductors for high voltage GIS (gas insulated switchgear). The high voltage GIS is used in electrical power system and operating reliability. In this paper, optimization possibility of barrier shape including both electrical insulation performance and mechanical strength, premised on that condition minimizing volume and light weight should be kept for high voltage GIS, could be achieved by analysis simulation. As a result, filling material which is lower permittivity such as $SiO_2$ instead of $Al_2O_3$ properly to the epoxy material, can be improved to increase the electrical insulation performance and mechanical strength for an optimized profile barrier of a high voltage GIS.

22.9kV GIS Modeling and Transient Recovery Voltage Analysis Using EMTP/RV (EMTP/RV를 이용한 22.9kV GIS 모델링과 과도회복전압 해석)

  • Jyung, Tae-Young;Baek, Young-Sik;Jeong, Ki-Seok;Park, Ji-Ho;Seo, Gyu-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.7
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    • pp.1199-1205
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    • 2010
  • The recent power system is required to a large size of facilities and high power technology according to increasing power demand. However, it could lead to spoiling the beauty of city and environment problem. The miniaturized facilities with large capacity such as GIS have been required in recent power system. The GIS(Gas Insulated Substation) using the SF6 insulation gas enables to miniaturize facilities with large capacity with high insulation performance. However, the substation installed GIS has required to new design model which is different from the conventional substation. The TRV(Transient Recovery Voltage) analysis on simple circuit may applied by differential equation. However, in case of relatively complicated system, EMTP(Electro Magnetic Transients Program) mainly has been used to design and simulate for transient analysis. This paper mainly design the 22.9 kV GIS system and analyze the transient recovery voltage of main circuit breaker using EMTP/RV. It also enables to easily design the other substation installed GIS with same maker and voltage level because the proposed GIS model consists of separated modules such as busbar, circuit breaker, bushing, CT, PT etc. Eventually, it contributes to comfortably compare the interrupting performance of circuit breaker and system TRV corresponding to the substation system configuration.

Development of Permanent Magnet Synchronous Motor for High voltage Gas Insulated Switchgear (초고압 Gas Insulated Switchgear 구동용 전동기 개발)

  • Oh, Young-Jin;Jeong, Gyun-Ha;Lee, In-Woo
    • Proceedings of the KIEE Conference
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    • pp.919-920
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    • 2007
  • Currently national High Voltage Gas Insulated Switchgear (GIS) operating mechanism is made up of spring operating mechanism or hydraulic operating mechanism. On the contrary, advanced technology trend in foreign countries replace current mechanical mechanism with electrical motor-drive mechanism that leads to participate GIS bid and increase sales with the point of simplification of driving system and IT application. Therefor it is essential to develop high voltage GIS using the motor-drive system to develop national heavy electric machine industries and catch up the technology to the advanced level. This paper therefore presents design and analysis of permanent synchronous motor for high voltage GIS, verifies the performance by the experimental test.

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Effect of the Inner Side Dielectric Coating of the Tank on the Particle Movement for Improving of GIS Insulation Reliability (GIS 절연 신뢰성 향상을 위한 탱크 내면 코팅이 파티클 거동에 미치는 영향)

  • Lee, Bang-Wook;Koo, Ja-Yoon;Kim, Min-Kyu;Kim, Ik-Soo
    • Proceedings of the KIEE Conference
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    • pp.267-269
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    • 1996
  • In this work, the influence of wire type conducting particles on the insulation reliability of GIS has been systematically investigated when outer electrode was dielectric coated by epoxy resin. For this purpose, coaxial cylinder-type electrode was adopted in 362 kV chamber and various size of Cu conducting particle was used and different gas pressure was applied. To prove the coating effect on the gas insulation, different thickness of epoxy coated outer electrode have been considered and the lift-off voltage and flashover voltage have been analyzed. The results show that the dielectric coated electrode has an remarkable influence on the reducing particle behavior in GIS system and enhancing the GIS insulation reliability.

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Temperature Rise Analysis of Busbar Part of Extra High Voltage GIS for Evaluation Current Ratings (초고압 GIS 모선부의 연속통전성능 평가를 위한 온도분포 해석)

  • Lee, B.Y.;Song, K.D.;Oho, Y.H.;Park, K.Y.;Shin, Y.J.
    • Proceedings of the KIEE Conference
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    • pp.31-33
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    • 1998
  • In this paper, the temperature rise within busbar part of high voltage GIS is calculated under the condition that the continuous current is carrying. Heat transfer by conduction and convection is considered between the current carryig conductor and SF6 gas. FLUX 2D which is a commercial electromagnetic and thermal analysis program is used. The results show reasonable temperature distribution.

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A Study on the Electrical Diagnostic Methods In GIS (GIS에 있어서 전기적 절연진단법에 대한 연구[1])

  • Choi, Jae-Gu;Kim, Young-Bae;Kim, Ik-Soo;Lee, Hyeong-Ho
    • Proceedings of the KIEE Conference
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    • pp.904-906
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    • 1998
  • PD pulses have about one nanosecond rise time in the $SF_6$ gas insulation. These pulses propagate in the apparatus to PD sensors in the form of the voltage oscillation, high frequency current and the electromagnetic radiation. In this paper, we investigated the characteristics of two types of PD sensors, by putting high frequency signals in the form of sine waves and pulse into the test apparatus in air. Also, we measured PD quantity from the needle electrode and the sensitivity of the sensors. We found that PD of 70pC could be detected with this method and the study in $SF_6$ gas should be carried out for application to $SF_6$ GIS.

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Performance Evaluation on Epoxy Insulation Spacer for Extra High-voltage GIS (초고압 GIS용 절연스페이서의 성능평가)

  • Heo, J.C.;Jeong, J.Y.;Oh, C.S.;Yang, D.I.;Park, J.W.
    • Proceedings of the KIEE Conference
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    • pp.2220-2222
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    • 2005
  • Epoxy Insualtion spacers for supporting the conductors and partitioning the sections in $SF_6$ Gas insulated Switchgear(GIS), require higher electrical, Thermal and mechanical reliability with other principal components in GIS to be operated without any failure in use. In this paper, we describe the results of the performance evaluation of electrical and mechanical properties for extra high-voltage GIS according to KEPCO spec. and the requirements of the insulators for GIS specified by IEC 62271-203(2004).

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Simulation of Capacitively Graded Bushing for Very Fast Transients Generated in a GIS during Switching Operations

  • Rao, M.Mohana;Rao, T. Prasad;Ram, S.S. Tulasi;Singh, B.P.
    • Journal of Electrical Engineering and Technology
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    • v.3 no.1
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    • pp.36-42
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    • 2008
  • In a gas insulated substation (GIS), Very Fast Transient Over-voltages (VFTOs) are generated due to switching operations and ground faults. These fast transients are associated with high frequency components of the order of a few hundreds of MHz. These transients may cause internal faults i.e., layer-to-layer faults or minor faults in a capacitively graded bushing, which is one of the important pieces of terminal equipment for GIS. In the present study, the PSPICE model has been developed to calculate the voltage distribution across the layers of 420kV graded bushing for high frequency pulses of rise time 1 to 50ns, which simulate the VFTO. For this simulation, an equivalent electrical network of bushing with different equivalent layers has been considered. The effect of different equivalent layers modeling circuits on the non-uniform voltage factor has been analysed. The influence of copper strip inductance on voltage distribution across layers has also been analysed for various rise times of high frequency transients. Finally, the leakage current of the bushing is calculated for evaluating the bushing condition under these transients.

A study on of drive mechanism for 245kV 40kA high-voltage Gas Insulated Switchgear(GIS) using SPMSM (SPMSM을 이용한 245kV 40kA GIS 조작기 개발에 관한 연구)

  • Jeong, Kyun-Ha;Oh, Young-Jin;Yeo, Chang-Ho;Suh, In-Young
    • Proceedings of the KIPE Conference
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    • pp.114-116
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    • 2007
  • Mechanical spring and hydraulic pressure operated mechanisms are applied in most of today's High Voltage Gas Insulated Switchgear(GIS)s. This paper proposes a new type of operation mechanism for GIS circuit breakers rated at 245kV and 40kA. The Motor-Direct-Drive-Mechanism (MDDM) has many advantages compared to conventional operating mechanisms. It has a very simple structure with only one moving part, low mechanical stress and audible noise. It also allows monitoring, operation speed control and self-diagnosis functions.

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