• 전기학회논문지
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• 제61권7호
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• pp.923-927
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• 2012

This paper studies a busbar design of high power HVDC converter. In order to design a electrical busbar, we need to consider electrical, mechanical and environmental condition. In this papre, we focus on the electrical design in terms of temperaure and currnet. Busbar conductor can be damaged to burn due to the temperature and fault current of busbar. In this paper, Busbar design of Jindo-Jeju HVDC #2 System that will start operate in 2012 is considered.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권12호
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• pp.628-632
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• 2006

This paper deals with the electric and thermal characteristics of the composite busbar composed of aluminum and copper. When AC current is flowing in Cu busbar used widely in conservative equipments like power cable, transformer, and switchgear & controlgear most current is concentrated on the surface of the busbar by the skin effect. Therefore, if the Cu region in the busbar having low current density is replaced with aluminum, we can largely reduce the product cost and weight of the busbar. To conform the performance of the composite busbar, we designed and fabricated a test Al/Cu composite busbar. Maximun temperature rise of the busbar was $35^{\circ}C$ when 1600 Arms of AC current was applied to the test composite busbar($120mm{\times}10mm$). Based on test results, we can expect to make the low-priced and light power equipments using the Al/Cu composite busbar.

• Current Photovoltaic Research
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• 제11권1호
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• pp.34-37
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• 2023

Solar energy had become the main energy industry of renewable energy along with hydroelectric power generation. One of the technologies that contributed to the popularization of photovoltaic power and the decrease in the unit price of photovoltaic modules was the large-area solar cell. However, as the area increased, the light receiving area increased and the current value increased accordingly. Since power loss occurs when the current value was large, the number of busbar was increased to increase the current collection rate, and a technology to lower the current value through half-cutting was developed. The bus bar of the solar cell served as a passage through which the generated current was transmitted. This was because when the number of busbar decreases, the moving distance of electrons increased, so the amount of power generation decreases and when it increases, shadows occured. An important aspect of the electrode design was the optimal balance of these busbars and number of fingers. Therefore, in this study, the characteristics of the solar cell according to the number of front bus bars of the large-area solar cell were simulated using Griddler 2,5 pro. After selecting the number of busbar with the best characteristics, the difference was compared by varying the number of fingers and a better direction for the number of cutting was presented.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제54권1호
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• pp.27-32
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• 2005

This study presents an analysis technique that can consider all variables which are needed in the design of short circuit current capability of electrical contacts. Required variables in the design are material of contact, contacting area, applied force, asperity of surface, current and so on. Short circuit current capability test was carried out for the interrelation of design variables and the verification of analysis technique. Temperature rise equation of the contacts was obtained from the test results, and also, a standard that is criterion of the occurrence availability of melting or spot of contact surface from test results was established.

• Journal of Power Electronics
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• 제16권6호
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• pp.2085-2098
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• 2016

Laminated busbars with a low stray inductance are widely used in NPC three-level inverters, even though some of them have poor performances in heat equilibrium and overvoltage suppression. Therefore, a theoretical method is in need to establish an accurate mathematical model of laminated busbars and to calculate the impedance and stray inductance of each commutation loop to improve the heat equilibrium and overvoltage suppression performance. Firstly, an equivalent circuit of a NPC three-level inverter laminated busbar was built with an analysis of the commutation processes. Secondly, on the basis of a 3D (three dimensional) cubical thermal model and mirror circulation theory, a supersymmetric mirror circulation 3D cubical thermal model was built. Based on this, the laminated busbar was decomposed in 3D space to calculate the equivalent resistance and stray inductance in each commutation loop. Finally, the model and analysis results were put into a busbar design, simulation and experiments, whose results demonstrate the accuracy and feasibility of the proposed method.

• 한국정보통신학회논문지
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• 제21권2호
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• pp.379-385
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• 2017

일반적으로 배전반, 분전반, 전동기제어반(Motor Control Center; MCC)은 집단거주지역, 빌딩, 학교, 공장, 항만, 공항, 상하수 처리장, 변전소, 중공업 플랜트 등의 광범위한 전력 수용가에 설치되어 특고압의 전력을 해당 설비들에 요구되는 전압으로 변환하여 공급하는데 사용된다. 이와 같은 배전반, 분전반, MCC에 포함되는 전기설비의 사고는 부스바 접촉부의 열화에 의한 사고, 부스바의 접점 및 연결 부위에서의 접촉 불량에 의한 사고, 부스바 접촉부의 과열현상에 의한 사고로 구분된다. 본 논문에서는 부스바 접촉부의 볼트 및 너트의 풀림상태, 접촉부 열화 측정이 가능하며, 정밀 가변저항을 이용하여 저항값의 변화에 따라 볼트 체결상태 감지 및 비접촉식 적외선 센서를 사용하여 부스바 접촉부 온도 감지 시스템을 설계하고 구현하였다. 부스바 접촉부 체결상태 감지를 위한 가변저항을 이용한 실험을 수행한 결과 볼트와 너트를 완전히 체결시키면 가변저항 값은 감소하였으며, 최대 오차범위는 0.1mm의 결과를 보였다. 또한, 부스바 접촉 저항값 변화에 따라 접촉부 온도가 $27.3^{\circ}C$에서 $69.3^{\circ}C$로 상승하는 결과를 확인하였다.

• 한국전기전자재료학회논문지
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• 제36권2호
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• pp.136-142
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• 2023

In the past, the efficiency of solar cells had been increased in order to increase the efficiency of solar modules. However, in recent years, in order to increase output in the solar industry and market, the competitiveness of solar cells based on large-area solar cells and multi-bus bar has been increasing. Multi-busbar solar module is a technology to reduce power loss by increasing the number and width of the front busbar of the solar cell and reducing the current value delivered by the busbar by half through half-cutting. In the case of the existing M2 (156.75×156.75 mm²) solar cell, even with a half-cut, power loss could be sufficiently reduced, but as the area of the solar cell is enlarged to more than M6 (166×166 mm²), the need for more divisions emerged. This affected not only solar cells but also inverters required for module array configuration. Therefore, in this study, the electrical characteristics of a large-area solar cell and after division were extracted using Griddler simulation. The output characteristics of the module were predicted by applying the solar cell parameters after division to PSPice, and a guideline for the large-area solar module design was presented according to the number of divisions of the large-area solar cell.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권5호
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• pp.313-319
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• 2000

In order to design the current carrying conductor for GIS, it is important to predict temperature-rise when rated current flows in the bus bar. However, it is not easy to apply the correct heat transfer coefficient on the boundary between different material for the thermal analysis. In this paper, the heat transfer coefficient which depends on parameters such like material constant, model geometry as well as ambient temperature, was calculated by analytic method. The calculated coefficient is used for the temperature rise prediction by F.E.M. The results show good agreement with experimental data.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.823-824
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• 2016

일반적으로 배전반, 분전반, 전동기제어반(Motor Control Center;MCC)은 집단거주지역, 빌딩, 학교, 공장, 항만, 공항, 상하수 처리장, 변전소, 중공업 플랜트 등의 광범위한 전력 수용가에 설치되어 특고압의 전력을 해당 설비들에 요구되는 전압으로 변환하여 공급하는데 사용된다. 이와 같은 배전반, 분전반, MCC에 포함되는 전기설비의 사고는 부스바 접속부의 열화에 의한 사고, 부스바의 접점 및 연결 부위에서의 접촉 불량에 의한 사고, 부스바 접속부의 과열 현상에 의한 사고로 구분된다. 본 논문에서는 부스바 접촉부의 볼트 및 너트의 풀림상태, 접촉부 열화 측정이 가능하며, 배전반 내부온도와 부스바 온도를 측정하여 추이변화에 대한 감시기능이 있는 부스바 접촉부 체결상태 모니터링 시스템을 제안한다. 제안된 시스템은 정량적인 부스바 체결상태 검출과 부스바 현재온도 검출의 이중적인 센싱에 의해 부스바 접촉부 정상여부 판별이 가능하여 전기설비 사고를 줄일 수 있을 것으로 기대된다.

• Transactions on Electrical and Electronic Materials
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• 제6권2호
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• pp.78-84
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• 2005

Standard crystalline solar cells are generally fabricated with the front grid pattern of silver paste contact. We have reported a detailed theoretical analysis of the proposed segmented cross grid line pattern in this paper. This work was carried out for the optimization of spacing and width of grid finger, main busbar and sub-busbar. The overall electrical and optical losses due to front contact were brought down to $10\%$ or even less as compared to the usual loss of $15\%$ or more in the conventional screen printed silver paste technology by choosing proper grid pattern and optimizing the grid parameters. The total normalized power loss for segmented mesh grid with plated metal contact was also observed and the total power loss could be brought down to $10.04\%$ unlike $11.57\%$ in the case of continuous grid and plated contact. This paper is able to outline the limitations of conventional screen printed contact.