유압구동식 레이돔 개폐장치 CFD 공력해석 및 구조해석

정대하(Dae-Ha Jeong),서민수(Min-Su Seo),김동현(Dong-Hyun Kim),최희주(Hui-Ju Choi),김은종(Eun-Jong Kim),강동언(Dong-Eon Kang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5

In this study, aerodynamic and structural analyses have been conducted for radome switchgear. In order to analyze wind load under the operating conditions such as opened radome with different angles and wind speeds. The computational fluid dynamics (CFD) based on Reynolds averaged Navier-Stokes equation with emphasized the k-? sst transitional flow turbulence model has been used. And the finite element method (FEM) for structural stress analysis has been conducted to consider self weight and wind load which obtained. As a detailed results, stress distributions are presented under various conditions.

전력용 개폐장치의 열플라즈마 유동에 관한 수치해석

이종철(J. -C. Lee),김우영(W. Y. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5

In this study, we calculated thermal plasmas happened in two types of switchgears for understanding the complex physics and the probability of thermal breakdown. The first part concerns modeling of switching arc itself with an auto-expansion chamber as an example. The second part focuses on simulation of the PTFE nozzle ablation effect by high-temperature switching arc with an puffer-assisted self-blast switchgear. The present method is expected to be useful for setting guideline of switchgear design and predicting the interruption capacity of arcing chambers.

72.5 kV 풍력 발전용 Dry-air Switchgear의 절연 특성

양찬희,오진석,박희태,김영일 한국풍력에너지학회 2024 풍력에너지저널 Vol.15 No.2

This paper describes the insulation breakdown characteristics of 72.5 kV dry-air insulated switchgear under development for installation in a wind power generator when a lightning impulse voltage is applied. For this study, the weak point of insulation due to the electric field concentration of the switchgear's internal shape was identified by finite element method (FEM) analysis, and the shape was actually simulated to measure and analyze the polarity of the lightning impulse voltage and the insulation breakdown characteristics according to the gas pressure at dry-air pressures of 0.1 Mpa to 0.45 Mpa. This study derives the maximum electric field with a 50 % discharge probability for each switchgear internal insulation vulnerable point based on the actual test and electrical simulation, which will be useful as reference data for supplementing and changing insulation design in the future.

가스절연 개폐장치 투입저항의 동특성 해석

조해용(Hae-Yong Cho),이성호(Sung-Ho Lee),임성삼(Sung-Sam Lim),이기정(Ki-Joung Lee),김민우(Min-Woo Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.11

스프링조작기를 가진 초고압 차단기의 동적 해석 및 검증

김승오(Seung O Kim),유완석(Wan Suk Yoo),임동수(Dong Soo Lim),최원호(Won Ho Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10

Spring Operating Mechanism(SOM) is a dynamic system for opening and closing of high voltage circuit breaker such as GIS, GCB. Also, for correct characteristic of opening and closing, SOM consists of many links, joints and chains, cams so that variety of dynamic characteristics are occurred, especially huge contact forces between with CAM and ROLLER, LINK and STOPPER. Dynamic analysis and test technique are required to predict, estimate and validate forces acting to parts in the developing and designing stage. In this paper, multibody dynamic analysis was carried out for 145㎸ circuit breaker with SOM using the RecurDyn program. And the reliability of analysis is validated through the comparison with test data of opening and closing.

가스절연개폐장치 스페이서 내장형 전자식 변류기의 설계 및 제작

안동현,김동언,김남훈,임승현,길경석 한국철도학회 2022 한국철도학회논문집 Vol.25 No.4

Bulky iron-core current transformers (CT) are installed in tanks of gas insulated switchgears (GIS) for current measurement in substations. This paper studied an electronic current transformer (eCT) embedded in a Spacer for miniaturization, eco-friendliness, and performance improvement of GIS. The electronic current transformer consists of a Rogowski current sensor (RCS) that can be embedded in a spacer, a differential amplifier and an active integrator. The RCS was fabricated in the form of a vertical structure PCB to acquire the insulation distance from the conductor of spacer and to withstand vibration and shock during operation. The sensitivity of the prototype eCT is 1.21mV rms /A, and the frequency bandwidth of –3dB is ranges from 5Hz to 20kHz. Current ratio errors evaluated at 5%, 20%, and 25% of the rated current of 4,000A were 0.55%, 0.35%, and 0.33%, and the phase differences were 57minutes, 27.2minutes and 25.9minutes, respectively. These results are within the accuracy for 0.5 class specified in IEC 60044-8, and were satisfied even at 100% and 120% of the rated current. If the eCT developed in this paper replaces the conventional iron-core current transformer, it is expected that the GIS length will be reduced by 33% and the amount of SF 6 will be reduced by about 12%.

부분방전에 의한 SF<SUB>6</SUB> 가스의 특성변화

황성철(Seong Cheol Hwang),왕국명(Guoming Wang),길경석(Gyung Suk Kil) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05

가스절연개폐장치(Gas insulated switchgear, GIS)에서 결함이 발생하면 절연이 파괴되고 대형 정전사고로 이어지므로 이를 예방하기 위한 각종 진단기술이 활용되고 있다. 가장 일반적인 방법은 부분방전(Partial Discharge, PD)을 검출하는 것이지만, GIS의 절연매체인 SF6가스(Sulfur Hexafluoride Gas) 특성변화에 대한 연구는 이루어지지 않고 있다. 본 논문에서는 부분방전을 발생시키고 PRPD(Phase Resolved Partial Discharge)와 SF6가스 특성 파라미터를 분석하였다. 방전시간이 지속됨에 따라 초기상태 대비 평균방전크기, 방전 횟수, 압력 및 밀도의 변화를 비교하였다. The defects existing in the gas-insulated switchgear (GIS) cause insulation breakdown and consequent outage. Various diagnostic techniques have been applied to prevent these accidents. The most widely used method is the diagnostic of partial discharge (PD) that generates from the defects. However, few researches has been carried out to study the characteristic changes of Sulfur Hexafluoride (SF6) gas, which is the insulation medium of GIS. In this paper, partial discharge was generated and the phase resolved partial discharge(PRPD) and parameters of SF6 gas were analyzed. The average discharge magnitude, pulse count, gas pressure and density in a specific period were compared with that of the initial state.

245kV 가스절연개폐장치의 내진성능 실증을 위한 시험 및 해석

김유경(Yu-Gyeong Kim),권태훈(Tae-Hoon Kwon),정영진(Yeong-Jin Jeong),김홍태(Hong-Tae Kim),김영중(Young-Joong Kim) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.5

가스절연개폐장치(GIS)는 안정적인 전력공급을 위한 대규모 설비이다. 최근 전력설비의 내진성능 검증이 중요해짐에 따라 진동대를 이용한 실제적 내진 시험이 요구되고 있지만, 진동대 규모의 한계로 해석에 기반한 평가가 주로 진행되고 있다. 그러나 해석법은 실제 거동을 모사하기 어려워 결과의 신뢰도가 낮으므로 타당한 해석법 개발이 필요하다. 본 연구에서는, 시험과 해석을 병행하여 대형 전력기기인 245kV GIS의 내진성능을 검증하였고, 결과를 비교 분석하여 대형 구조물용 내진 해석 기법의 타당성을 평가하였다. 245kV GIS는 해석과 시험법에서 충분한 안전성을 보였고, 해석의 결과는 시험과 10% 이내의 차이를 보였다. 높은 신뢰성의 원인으로 질량, 강성, 입력 가속도를 분석하였다. 본 연구는 내진 시험을 수행 할 수 없는 대형 전력기기의 내진성능 실증에 활용될 수 있을 것으로 기대된다. Gas insulated switchgear is large-sized electric equipment for providing a reliable supply of electric power. Recently, seismic tests of electric equipment using a shaking table have been mandated because seismic performance has become an increasingly important issue. However, basic analysis methods continue to be used because some electric equipment is too large for shaking table facilities. Thus, a reliable analysis method should be developed for large-scale electric equipment. This study aims to evaluate the seismic qualification of a 245kV GIS in accordance with IEEE-693 and to validate the analysis method by comparing it with test results. Both the test and the analysis showed that the 245kV GIS has proper seismic safety. Furthermore, the differences between the analysis and the test results are less than 10% for an accurately given mass, stiffness, and input acceleration. It is expected that this study can be used for the seismic qualification of large-scale electrical structures.

초고압 가스절연개폐장치(GIS) 구동부 LINK계의 내구성 평가

신익호(I. H. Shin),한동영(D. Y. Han),송원표(W. P. Song),김덕수(D. S. Kim),이종규(J. G. Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3

The principal purpose of this simulation is to visualize the fatigue damage about circuit breaker's link system following to its driving condition. High voltage GIS(Gas Insulated Switchgear) consists of many parts, CB(Circuit Breaker), DS(Disconnecting Switch), ES(Earthing Switch), etc.. Especially CB has many links and levers for its driving, opening and closing motion. First we determined load profiles at each link and lever analyzing its motion by kinematic software and correlating it's data with experimental one. Second the structural analysis of these link and lever was performed with unit load. Finally we carried out durability analysis by stress life method with Miner's damage rule and by vibration fatigue method with Dirlik solution method using stress tensors from structural and natural frequency analysis results and relative response load time histories from kinematics results.

SF₆ 가스중 결함별 부분방전의 PRPD 분석

조향은(Hyang-Eun Jo),길경석(Gyung-Suk Kil),박대원(Dea-Won Park),홍성준(Seong-Jun Hong) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11

본 논문에서는 가스절연개폐장치 절연진단 알고리즘 개발을 위해 SF₆ 중 결함별 부분방전 패턴을 분석하였다. 결함을 모의하기 위하여 Protrusion on the conductor (POC), Enclo sure (POE) 및 Free particle (FP)의 전극계를 설계하고, 각 결함별 부분방전의 위상분포(φ), 크기(q) 및 펄스 수(n)를 비교하였다. POC와 POE의 경우 부분방전 펄스가 각각 40°~130°와 230°~310°에서 분포하였으며, FP는 전대역에 걸쳐 나타났다. POC는 정극성에서 98.6%, POE는 부극성에서 98.3%의 부분방전 펄스가 검출되었으나, FP는 양극성에서 비슷한 분포를 나타내었다. 또한, 최대방전량은 POC와 POE에서 12.5pC, FP에서 62.5pC이었다. 측정결과로부터 절연 결함별 부분방전의 특성을 확인할 수 있었다. This paper described the analysis of partial discharge (PD) pattern on insulation defects in SF₆ gas to develop an insulation diagnosis algorithm for Gas Insulated Switchgear (GIS). Protrusion on the conductor (POC), enclosure (POE) and free particle (FP) were fabricated to simulate insulation defects. Phase (φ) distribution, magnitude (q) and pulse counts (n) of PD pulse were compared on each defect. PD pulses on POC and POE were distributed in ranges of 40°~130° and 230°~310°, respectively. However, the distribution on FP was in all phase. The positive polarity of PD pulses detected was 98.6% on the POC and the negative one of them was 98.3% at on the POE. The polarity ratio of them on FP was about one. In addition, the peak charge was 12.5pC on POC and POE, 62.5pC on FP. From the experimental results, we could derive a feature of PD pulse on each insulation defects.