http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
전류변성기의 비오차와 위상각오차의 계산값과 실험값의 차에 의한 측정시스템 유용성 검증기술에 관한 연구
정재갑,권성원,이상화,박영태 대한전기학회 2004 전기학회논문지C Vol.53 No.4(C)
A current transformer(CT) used for the estabilishment of high current national standard, has generally very small ratio error and phase angle error. Both the errors of CT depend critically on the external burden used. When both the ratio and phase angle errors at two different burdens including zero burden are known, those at any other burdens are calculated theoretically. The theoretical values are well consistent with the experimental results within the 82 x 10-6, implying the measurement system of CT in KRISS is well maintained.
정재갑,권성원,박영태,김명수 대한전기학회 2005 전기학회논문지C Vol.54 No.11-C
Both ratio error and phase angle error in voltage transformer(VT) depend on values of VT burden used. Thus, precise measurement of burden is very important for the evaluation of VT. A method of evaluation for VT burden has been developed by employing the portable decade resistor, with AC-DC resistance difference less than 10-3. The burden value(value and power factor) can be obtained by conductance and susceptance, obtained by measuring the change of ratio error and phase angle error caused by the resistance change of decade resistor. The burden value and power factor obtained by the method are consistent with those obtained using power analyzer within corresponding uncertainties.
전기용량 부담을 이용한 전압변성기 비교 측정 시스템의 비오차 및 위상각 오차의 직선성 평가기술
정재갑,김한준,권성원,박영태,김명수 대한전기학회 2005 전기학회논문지C Vol.54 No.6(C)
Voltage transformer(VT) comparison measurement system is usually used for measurements of ratio error and phase angle error of VT made in industry. Both ratio error and phase angle error in VT are critically influenced by values of burden of VT used. External burden effects on both ratio error and phase angle error in VT are theoretically calculated. From the theoretical calculation, a method of evaluation for linearity of ratio error and phase angle error in VT measurement system have been developed using the standard capacitive burdens, with negligible dissipation factor less than 10-4. These burden consists of five standard capacitors, with nominal capacitance of 1.1 μF, 1 μF, 0.1 μF, 0.01 μF, 0.001 μF. The developed method has been applied in VT measurement system of industry, showing in good consistency and linearity within 0.001 % between theoretical and measured values.
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.