• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.334-335
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• 2006

Solid insulation exposed to voltage is degraded by electrical tree process. And the degradation of the insulation is accelerated by voltage application. For this experimental, specimen of electrical tree model is made by XLPE (cross-linked polyethylene). And the size of the specimen is 7*5*7 $mm^3$. Distance of needle and plane is 2 mm. Voltages applied for acceleration test are 12 kV to 15 kV. And distribution characteristic of degraded stage is studied too. As a PD detecting and data process, discharge data acquire from PD detecting system (Biddle instrument). The system presents statistical distribution as phase resolved. Moreover the processing time of electrical tree is recorded to know the speed of degradation according to voltage.

• Elastomers and Composites
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• 제46권1호
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• pp.22-28
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• 2011

전기의 흐름을 막는 절연재료는 다양한 전기/전력기구에서 도체에 흐르는 전기를 차단하면서 도체와 외부를 분리/지지하는데 사용한다. 절연재료에는 유리, 절연유, 가스, 종이, 고분자가 있으며 현재는 주로 고분자 절연재료가 전선에 사용된다. 최근 환경규제 및 친환경 소재로의 변화에 따라 고분자 절연재료에 사용되는 물질들도 친환경 화하고 있다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.613-616
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• 1999

Polyehtylene[PE] in polymer insulation materials of used power cable have carried out in abundance of experiment and study for electrical conduction, insulation breakdown, dielectric character and so on. when apply to field for power cable to make PE, application of DC withstand test to put in practice for inspection is get to effect accumulated space charge. In this paper, to make use of Pulsed Electro-Acoustic(PEA), It is analysis to take shape space charge under AC and DC, clear up the point at issue for DC withstand test impressing

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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• pp.1476-1477
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• 2006

Solid insulation exposed to voltage is degraded and by electrical tree process. And the degradation of the insulation is accelerated by voltage application. For this experimental, specimen of electrical tree model is made by XLPE(cross-linked polyethylene). And the size of the specimen is 7*5*7 $mm^3$. Distance of needle and plane is 2mm. Voltage applied for acceleration test are 12kV. And distribution characteristic of degraded stage is studied too. As a PD detecting and data process, discharge data acquire from PD detecting system(Biddle instrument). Their results of PD distribution show good present and are good discriminating skill.

• 전기학회논문지
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• 제58권11호
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• pp.2229-2235
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• 2009

In this paper, each specimen blended at weight proportions of 80% HDPE to 20% EVA, 70% HDPE to 30% EVA, 60% HDPE to 40% EVA, and 50% HDPE to 50% EVA was manufactured respectively. The insulation performances of the proposed insulator were compared with conventional XLPE, main insulating material of CV cable on the basis of the investigation results of DC insulation performances. From the space charge density, electric field and potential profiles with raising DC voltage and time variation in HE82, distortion of electric field distribution was improved. As EVA mixed into the bulks acts as nucleation in crystallization process of HDPE, the size of spherulites became decreased and finally formed continuous network structure. Ultimately, it resulted from extinction of space charge in the interfacial region of spherulites.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1387-1388
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• 2007

Solid insulation exposed to voltage is degraded by electrical tree process. And the degradation of the insulation is accelerated by voltage application. For this experiment, specimens of electrical tree models were made by three types of XLPE (cross-linked polyethylene). And distribution characteristics of degraded stages are studied too. As a method of detecting and data process, discharge data was acquired from PD detecting system (Biddle instrument). And microscope and digital camera were used to observe the morphologies of the electrical tree to divide stages of the tree. The system presents statistical distribution as phase resolved. Moreover the processing time of electrical tree is recorded to know the speed of degradation according to voltage.

• 한국철도학회논문집
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• 제20권2호
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• pp.203-209
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• 2017

전력공급의 안정성 및 신뢰도 향상을 위해 각종 전력설비의 예방진단에 관한 연구개발이 활발하다. 가스절연개폐장치와 변압기와 같은 단위 기기의 절연진단기술은 빠르게 발전하고 있으나, 전력케이블에 있어서는 단순히 결함의 유무와 부분방전을 측정할 뿐, 세부적 특성에 대해서는 거의 연구되고 있지 않다. 따라서 본 논문에서는 XLPE 케이블에서 보이드의 크기와 위치에 따른 부분방전 특성과 결함의 위치추정에 관한 연구를 수행하였다. 보이드의 크기 및 위치에 따른 4종의 결함계를 모의하였으며, 부분방전펄스는 주파수 대역 150kHz~30MHz의 고주파변류기로 검출하였다. 실험결과, 도체에 인접한 결함일수록 방전전하량이 크고, 정극성에 비해 부극성의 방전펄스 수가 약 20% 많게 나타났다. 또한 TDR 방법으로 결함위치를 산출하였으며, 50m 케이블에서 1m 이내로 결함의 위치를 추정할 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 C
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• pp.1102-1104
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• 1999

It is very essential to find out defects and remove them in the insulation at the early stage because the defects in the insulation induce PD which deteriorates the material, resulting in the breakdown. In the real application of high voltage, the interface of the different insulation is the weakest place for both electrical and mechanical aspects. In this paper, characteristics of PD caused by the artificial defects, such as metallic particles, voids and moist fibers, at the interfaces of the cable joint (PJB) were investigated using the specially designed electrode system.

• 전기학회논문지
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• 제67권7호
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• pp.860-864
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• 2018

The signal of space charge distribution measured in polymer insulating materials by the PEA has some noises due to the system circuits and the ringing phenomena in the sensor of PVDF and so on forth. It's magnitude mainly depends on the thickness of the insulation material, and it is also affected by the attenuation and dispersion when traveling in a dielectric material. In order to make it reliable, the correcting process for the signal is essential. In this study, we proposed the new deconvolution process on the measured signal of space charge distribution in the flat XLPE insulator, and developed a new signal processing algorithm. Using this, we could improve the reliability of the measured signal much and analyze the effects of space charge clearly in materials.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.158-159
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• 2006

The system measuring the Partial discharge(PD) is very essential to investigate the hazard defects in the insulation systems of the high voltage engineering. We included two parts in this discussion; The proposed method of Foil Sensor Array and the normally used method m the practice. Firstly, it will be shown the improved sensitivity of our proposed FSA sensor compare with the existing normal foil sensor. And then, the linearity of detecting sensitivities of various kinds of FSA sensors such as $2{\times}2$, $2{\times}4$, $3{\times}3$ etc. using in our experiments, was shown. From the obtained results, we can see that FSA sensor is more sensitivity than normal foil sensor and the linear increment property of FSA sensitivities.