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고전압 전기용량 브리지를 이용한 전압변성기의 비오차와 위상각 오차의 측정과 불확도 분석
정재갑,권성원,이상화,김명수 대한전기학회 2006 전기학회논문지C Vol.55 No.3(C)
- A potential transformer(PT) has ratio error and phase angle error. Precise measurement of the errors of PT can be achieved using high voltage capacitance bridge, high voltage capacitor and low voltage capacitor. The uncertainty for this method is evaluated and found to be 20 x 10-6 in both ratio error and phase angle error. The values measured for PT using the method are well consistent with the those measured for same PT in NMIA(National Measurement Institute of Australia) within the corresponding uncertainty.
전압변성기 비교 측정 장치의 비오차 및 위상각 오차의 직선성 평가기술
정재갑,권성원,박영태 대한전기학회 2004 전기학회논문지C Vol.53 No.9(C)
Both ratio error and phase angle error in voltage transformer(VT) depend on values of burden of VT used. A method of evaluation for linearity of ratio error and phase angle error in VT measurement equipment have been developed using the standard resistance burdens, with negligible AC-DC resistance difference less than 10-6. These burden consists of five standard resistors, with nominal resistance of 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, and 1 MΩ. The developed method has been applied in VT measurement equipment of industry and the validity of the developed method has been verified by showing the consistency of the result of linearity obtained using VT with wide ratio error.
전류변성기 비교기와 정밀션트저항을 이용한 전류변성기용 부담의 평가기술
정재갑,이상화,강전홍,김명수 대한전기학회 2006 전기학회논문지C Vol.55 No.5(C)
- Both ratio error and phase angle error in current transformer(CT) depend critically on values of CT burden. Thus, precise measurement of CT burden is very important for the evaluation of CT. A method for the measurement of CT burden has been developed by employing the portable shunt precise resistor with negligible AC-DC resistance difference less than 10-5. The burden value(value and power factor) can be calculated from resistance and reactance obtained by measuring the change of ratio error and phase angle error caused by the change of shunt resistor. The uncertainty for the method is evaluated and found to be about 2 %.
전류변성기 비교 측정 장치의 비오차 및 위상각 오차의 직선성 현장 평가기술
정재갑,권성원,이상화,강전홍,김명수 대한전기학회 2006 전기학회논문지C Vol.55 No.6(C)
- A method for evaluation of the linearity of both the ratio error and phase angle error in the current transformer(CT) comparison measurement equipment has been developed by employing the standard resistors with negligible AC-DC resistance difference less than 10-5. The non-reactive standard resistors for the linearity check of the system are used as the external burden connected with the secondary of CT under test. These burdens consist of nine standard resistors, with the nominal resistance of 0.01 Ω, 0.1 Ω, 0.2 Ω, 0.4 Ω, 0.6 Ω, 1 Ω, 2 Ω, 4 Ω, and 10 Ω. For linearity check, the developed method has been applied in the CT comparison measurement equipment belonging to the industry.
정재갑,문영일,정기수,김규태 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
To characterize the dielectric relaxation embedded in polymers, we developed a program algorithm that analyzes the relaxation processes from dielectric permittivity versus frequency data based on governing functions such as the Havriliak-Negami function including the conductivity contribution. With the help of the developed simulation program, we have identified three processes: an α process due to rotational and segmental motions of the C-C bond, an α' process attributed to the fluctuation of the end-to-end dipole vector of the polymer chain, and the conduction contribution observed at high temperatures and low frequencies. The activation energy and glass transition temperature for the two main relaxations were independently determined from both the imaginary permittivity versus frequency and temperature by assuming Arrhenius dependence and the Vogel-Fulcher-Tamman law. The results obtained by the two methods for α and α' relaxations were compared with each other and with that obtained by differential scanning calorimetry.
전자저울을 이용한 고무에서 수소기체의 장입량 및 확산도 측정 기술 개발
정재갑,전상구,백운봉,남승훈 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.2
We developed an ex-situ technique to determine the uptake and diffusivitiy of hydrogen gas dissolved in rubber by employing electronic balances and diffusion analysis program. This method is applied to rubbers such as nitrile butadiene rubber (NBR), ethylene propylene diene monomer (EPDM), fluoroelastomer (FKM), which are used as hydrogen gas seals in hydrogen infrastructures. After exposure to hydrogen gas of high pressure at 35 MPa and 70 MPa, the uptake and diffusivity (D) of hydrogen is obtained together with measured uncertainty. NBR and EPDM shows two kinds of hydrogen diffusion bebaviors; the fast diffusion is due to the H2 adsorbed in the main polymer network, the slow diffusion is due to the H2 trapped in the carbon black filler. Whereas the FKM appears single diffusion behavior