• Title, Summary, Keyword: Voltage error correction

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A Practical Voltage Error Correction Technique for Distribution System under Distribution Automation Environment

  • Aslam, Muhammad;Kim, Hyung-Seung;Choi, Myeon-Song;Lee, Seung-Jae
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.669-676
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    • 2018
  • Transmission system has been well studied since long time and power system techniques of distribution system are more or less derived from transmission system. However, unlike transmission systems, many practical issues are encountered in the distribution system. Considerable amount of error is observed in voltage obtained from the Feeder Remote Terminal Units (FRTUs) measured by the pole mounted PTs along the distribution feeder. Load uncertainty is also an issue in distribution system. Further, penetration of Distributed Generators (DGs) creates voltage variations in the system. Hybrid radial/ loop distribution system also make it complicated to handle distribution system. How these constraints to be handled under Distribution Automation (DAS) environment in order to obtain error free voltage is described in this paper and therefore, a new approach of voltage error correction technique has been proposed. The proposed technique utilizes reliable data from substation and the FRTUs installed in DAS. The proposed technique adopts an iterative process for voltage error correction. It has been tested and proved accurate not only for conventional radial systems but also for loop distribution systems.

Measurement of Ratio Error/Phase Angle Error of Potential Transformer using High Voltage Capacitance Bridge and Uncertainty Analysis (고전압 전기용량 브리지를 이용한 전압변성기의 비오차와 위상각 오차의 측정과 불확도 분석)

  • Kwon, Sung-Won;Lee, Sang-Hwa;Kim, Myung-Soo;Jung, Jae-Kap
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.3
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    • pp.134-141
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    • 2006
  • 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 $20{\times}10^{-6}$ 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.

Evaluation Technique for Linearity of Ratio Error of Instrument Transformer Comparator Using Voltage Transformer with Wide Range of Error Ratios (넓은 범위의 비오차를 갖는 전압변성기를 이용한 계기용 변성기 비교 측정 장치의 비오차 직선성 평가기술)

  • Jung Jae Kap;Kwon Sung Won;Kim Han Jun;Park Young Tae;Kim Myung Soo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.2
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    • pp.66-70
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    • 2005
  • Linearity of ratio error of instrument transformer comparator has been tested using wide ratio error voltage transformer(VT) with the ratio errors in the range of -3 % to 3 %. The technique is the method for evaluation of the linearity for instrument transformer comparator by comparing both the theoretical and experimental values in wide ratio error VT. The developed method has been successfully applied for calibration and correction in instrument transformer comparator belonging to industry.

An automatic calibration technique for piezoelectric pressure transducers (압전형 압력센서의 교정기법 자동화)

  • Hong, Sung-Soo;Choi, Ju-Ho;Yoo, Jun
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1368-1371
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    • 1996
  • This paper presents an automatic calibration technique for piezoelectric low pressure transducer, which is useful to measure a pressure within 500 psi. This system with automatic calibration function and error correction algorithm generates standard dynamic pressure for the calibration of sensor. With the compensation for the offset voltage and the pressure error, the accuracy and the usefulness of the proposed scheme is validated.

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An Automatic Calibration Technique for Piezoelectric Pressure Transducers (압전형 압력센서의 교정기법 자동화)

  • 홍성수;최주호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1012-1016
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    • 1996
  • This paper presents an automatic calibration technique for piezoelectic low pressure transducer, which is useful to measure a pressure within 500 psi. This system with automatic calibration function and error correction algorithm generates standard dynamic pressure for the calibration of sensor. With the compensation for the offset voltage and the pressure error, the accuracy and the usefulness of the proposed scheme is validated.

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Evaluation for Ratio Error of Voltage Transformer Comparator using Standard Resistors (표준저항기를 이용한 전압변성기 비교기의 비오차 평가)

  • Han, Sang-Gil;Kim, Yoon-Hyoung;Jung, Jae-Kap;Han, Sang-Ok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.4
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    • pp.412-416
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    • 2008
  • We have developed the calibration technique of the VT comparator using nonreactive standard resistors, which evaluates both accuracy and linearity of the VT comparator by comparing experimental values with theoretical values. The correction values of VT comparator obtained by using both our method and wide ratio error VT are consistent within the expanded uncertainty. Furthermore the specification for ratio error of VT comparator have been revaluated.

Evaluation Technique of Linearity of Ratio Error and Phase Angle Error of Voltage Transformer Comparison Measurement Equipment (전압변성기 비교 측정 장치의 비오차 및 위상각 오차의 직선성 평가기술)

  • 정재갑;박영태;권성원
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.9
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    • pp.470-474
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    • 2004
  • 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 $\Omega$, 1 k$\Omega$, 10 k$\Omega$, 100 k$\Omega$, and 1 M$\Omega$. 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.

Design of a 6bit 800MS/s CMOS A/D Converter Using Synchronizable Error Correction Circuit (동기화 기능을 가지는 오차보정회로를 이용한 6비트 800MS/s CMOS A/D 변환기 설계)

  • Kim, Won;Seon, Jong-Kug;Yoon, Kwang-Sub
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.5A
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    • pp.504-512
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    • 2010
  • The paper proposes the 6bit 800MS/s flash A/D converter that can be applied to wireless USB chip-set. The paper simplified the error correction circuit and synchronization block as one circuit which are used respectively, and furthermore reduced the burden on the hardware. Comparing to the conventional error correction circuit, the proposed error correction circuit in this paper reduced 5 MOS transistors, the area of each error correction circuit is reduced by 9%. The A/D converter is fabricated with 0.18um CMOS 1-poly 6-metal process, and power dissipation is 182mW at 0.8Vpp input range and 1.8V supply voltage. The measured result shows 4.0bit of ENOB at 800MS/s conversion rate and 128.1MHz input frequency.

Evaluation Technique of Linearity of Ratio Error and Phase Angle Error of Voltage Transformer Comparison Measurement System Using Capacitor Burden (전기용량 부담을 이용한 전압변성기 비교 측정 시스템의 비오차 및 위상각 오차의 직선성 평가기술)

  • Jung Jae Kap;Kim Han Jun;Kwon Sung Won;Kim Myung Soo
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.6
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    • pp.274-278
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    • 2005
  • 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 $\mu$F, 1 $\mu$F, 0.1 $\mu$F, 0.01 $\mu$F, 0.001 $\mu$F. 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.

0.6~2.0 GHz Wideband Active Balun Using Advanced Phase Correction Architecture (진화된 위상보정 구조를 갖는 0.6~2.0 GHz 광대역 Active Balun 설계)

  • Park, Ji An;Jin, Ho Jeong;Cho, Choon Sik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.3
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    • pp.289-295
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    • 2014
  • In this paper a wideband active balun using advanced phase correction architecture is proposed. The proposed active balun is constructed with each different architecture of active balun combined with the cascode architecture to improve phase correction performance compared with conventional phase correction techniques. Operating over 0.6~2.0 GHz band, the proposed balun shows $10^{\circ}$ of phase error and 2 dB of gain error with 7 mW power consumption from 1.8 V supply voltage.