• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.154-157
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• 2006

지중 전력케이블의 접속함은 금속보호관(Casing or Protective Tube)의 전기적 검토를 통해서 적정 단면적을 산정하여 고장시 고장전류론 흘려주어야 한다. 현재 국내외 금속보호관은 그 재료로서 Copper를 사용하고 있으나 현장에서의 시공성 및 취급 용이성 때문에 알루미늄 보호관으로 재질 변경이 이루어지고 있다. 본 논문에서는 기존의 Copper보호관과 Aluminium보호관에서의 비교검토를 통해서 Aluminium보호관의 유효성을 검토하고 구리에서 알루미늄으로 재질 변경이 이루어 졌을 때 열적 제약조건을 고려하여 적정단면적을 재 산정한다. 또한 산정된 단면적은 단락시험을 통해서 그 유효성을 입증하였다.

• 한국전기전자재료학회논문지
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• 제20권9호
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• pp.780-786
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• 2007

This paper describes the influence on partial discharge characteristics of defects at the model XLPE/EPDM interfaces of power cable joints. The defects of void and copper which could inadvertently be present at the joint interface. We measured ${\Phi}-n,\;{\Phi}-q$ patterns by a computer-aided partial discharge measuring system. Several parameters i, e, maximum discharge $q_{max}$ [pC], average discharge q [pC/cycle], and average angle of discharge ${\Theta}g$ [deg] were found to depend upon the defect type varying applied voltage. As the result of time evaluation, partial discharges are small different at copper defects, but is decreasing obviously about 20 minutes at void defect. It considered that difference of magnitude of total positive discharge of Q+ [pC] and total negative discharge of Q- [pC] is SPMD(swarming pulsive micro discharges).

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.271-273
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• 1991

We have developed 154kV XLPE (Cross-linked Poly-ethylene) Cable accessories which show excellent performances. The results obtained from experiments using miniature model justified our electrical design and adopted materials, and assembly tests verified higher reliability of these accessories. Basic concepts of design and test, test results and failure analysis are presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 하계종합학술대회 논문집
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• pp.432-435
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• 1989

This paper presents an algorithm for electric field analysis which is essential to insulation design of extra-high voltage oil-filled cable accessories using finite element method. Governing equation is induced by electromagnetic equation. Variational method is adopted for FEN formulation. Automatic mesh generation which saves time and labor is introduced for the input data. The application results of proposed algorithms were used for insulation design to develop 345kV cable joint.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 추계학술대회 논문집 학회본부
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• pp.211-215
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• 1989

This paper presents the thermal analysis of EHV OF cable accessories using FEM. The governing equation about the temperature in the cable accessories is induced by the energy balance equation. Since the temperature distribution is a function of space and time, the weighted residual method is adopted for FEM formulation. The difference approximation is used to treat the time differential term in the element equation. Automatic mesh generation which save time and labor is introduced for the data input process. It will be expected that the following thermal analysis result will be very useful to cable accessories design.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1801-1803
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• 1996

This paper describes a diagnosis of cable splices by analysis of ultrasonic signals which is generated by partial discharge. Peak-peak amplitude of ultrasonic signals was used to diagnose cable splices. It is proposed that aging discrimination is possible by analysis of ultrasonic signals in cable splices.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1907-1909
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• 1996

In this paper, ultrsonic detection properties at a premolde joint utilized in a 23kV cables are studied. In a experiment a artificial defect within a joint and a measuring system are builded for generating discharges, gathering data about a detection properties, respectively. The experiment results show that one point detection is not allowed for monitoring a global status of a joint discharges and a detection sensitivity is less than 100pC. And also the attenuation and wave speed at the material of joint insulator are obtained.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2000년도 학술대회논문집
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• pp.160-162
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• 2000

This paper describes the study on the basic characteristics of discharge generated in cable splices using ultrasonic measurement method. Two kinds of defect which might be existed in a real cable splice were simulated. One is surface discharge moisture and metallic alien substances and the other is partial discharge by metallic particle. As a result, there were some differences in the characteristics of ultrasonic signals according to each defect. Therefore, it was found that is could be possible to protect the failure in cable splices in advance by analyzing the ultrasonic signals coming from the cable splice due to partial discharge.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 E
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• pp.1853-1855
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• 1997

This paper describes the characteristics of partial discharge generated by conducting particle in cable splice using ultrasonic method. For simulating partial discharges generated by defects, outer semi conductor of cable splice as ring share electrode was used. The conductive particle was attached on the surface of cable insulator(XLPE) to examine the affection of conducting particles in cable splice. The correlation between the partial discharge quantity and the magnitude of the ultrasonic signal was investigated as the number, length, diameter and alignment of particle when applied voltage increased.

• 대한전기학회논문지:전력기술부문A
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• 제52권11호
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• pp.661-667
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• 2003

It has little possibility that a cable causes any problem in electric power facilities. But when a trouble occurs in cable or cable joint, the damage is very severe. The main causes of the cable defections are bad cable making procedure, poor cable operation and deterioration according to the years. There are some cases to have potential problems due to many cable connection points, because of short length of cable, especially in 154㎸ system. In this study, novel method to measure partial discharge in cable joints is proposed and the effectiveness and the reliability of the proposed method is shown through experiment results of field.