• Title/Summary/Keyword: live-line measurement

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A Development of the Measuring System for Grounding Properties in Liveline (활선상태 접지특성 측정시스템 개발)

  • Choi, Nam-Ho;Moon, Young-Pyo;Jung, Jae-Gi;Park, Kang-Sik;Han, Sang-Ok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05c
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    • pp.36-40
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    • 2002
  • This paper presents the results of a investigation, a development of the measuring system for grounding properties in live-line. The importance of the grounding system and it's property has been increased with the development, enlarge in capacity, of electrical industry. Moreover, with the rapid growth of communication and precision industry, now, we should consider the grounding properties to ensure the stable and/or safe operation. But the conventional measuring system is not proper to measure the grounding properties of the system, voltage applied. So, in this investigation, we proposed a new method for live-line measurement and develope the system. And through the field test we could confirm the superior performance of th developed system.

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Development of Live-line Insulator Tester and Its Application to 154kV Power Lines - Part 1 : Tester Development (활선애자점검기의 개발 및 154kV 선로에의 적용 - 제1부 : 점검기 개발)

  • Lee, Jae-Kyung;Park, Joon-Young;Cho, Byung-Hak;Oh, Ki-Yong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.1
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    • pp.83-88
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    • 2010
  • A new live-line insulator tester was developed to detect faulty insulators in 154kV power transmission lines. This paper is the first part of the two-part paper and deals with its tester development. The developed tester has the following characteristics. First, it automates parts of the insulator inspection process by using a sensor and an actuator, and secondly, it sustains its weight by itself, not by a lineman. Finally, it measures the insulation resistance of an insulator together with its distribution voltage to provide more information for its analysis and diagnosis. These leads to the improvement of its operation efficiency, measurement reliability and usability. Its effectiveness was validated by live-line field tests in actual power lines.

Development of a Live-line Insulator Inspection Tool System for 154 kV Power Transmission Lines

  • Lee, Jae-Kyung;Park, Joon-Young;Cho, Byung-Hak;Oh, Ki-Yong
    • Journal of Electrical Engineering and Technology
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    • v.7 no.1
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    • pp.23-33
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    • 2012
  • The current paper deals with a new live-line insulator inspection tool system that will be used by the Korea Electric Power Corporation for its 154 kV power transmission lines in 2011. Unlike the existing contact type tools, the developed inspection tool automates parts of the insulator inspection process using a sensor and an actuator. The tool sustains its weight independently, not by a lineman. In addition, the inspection tool measures the insulation resistance of an insulator together with its distribution voltage, thus providing more information for analysis and diagnosis. Such characteristics improve the system's operation efficiency, measurement reliability, and usability. We confirmed its effectiveness through live-line field tests with actual power transmission lines.

The Development of HFPD System for Mibile-loading Vehicles (차량탑재형 HFPD의 개발)

  • Kim, Deok-Geun;Im, Jang-Seop;Yeo, In-Seon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05c
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    • pp.33-37
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    • 2001
  • Recently, the HFPD measurement testing is widely used in partial discharge measurement of HV machines because HFPD measurement testing receives less influence of external noise and has a merit of good sensitivity. Also HFPD testing is able to offer the judgement standard of degradation level of HV machine and can detect discharge signals in live-line. Therefore it is very useful method compare to previous conventional PD testing method and effective diagnosis method in power transformer that requires live-line diagnosis. But partial discharges have very complex characteristics of discharge pattern so it is required continuous research to development of precise analysis method. In recent, the study of partial discharge is carrying out discover of initial defect of power equipment through condition diagnosis and system development of degradation diagnosis using HFPD(High Frequency Partial Discharge) detection. In this study, simulated transformer is manufactured and HFPD occurred from transformer is measured with broad band antenna in real time, the degradation grade of transformer is analyzed through produced patterns in simulated transformer according to applied voltages.

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The Development of Magnetic Field Measurement System of 3 Axis (3축 자계 측정 시스템의 개발)

  • Kim, Ki-Joon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.4
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    • pp.253-257
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    • 2017
  • Nowadays, it is increasingly important to detect whether cables are live for the operator's safety if there is a sudden power failure. It is especially hard to detect the electrical field of an underground line because of shielding. This paper on detection of live-line states in cables studied the detection characteristics of the change in the magnetic field and axis as the frequency, voltage, and distance at the same load are changed using 3 axes. A search coil type was used as a magnetic field sensor with non-contact. We found that magnetic fields decrease proportionally to the square of the distance and the decrease of rated voltage with load effected to magnetic field. The magnetic field was detected by 3-axis sensors given correct proximity, but appeared as noise components beyond a distance of 2 cm.

The Analysis of VHF/UHF PD and 3d-PD Pattern (3d-PD 패턴과 VHF/UHF PD 신호의 고찰)

  • Lim, Jang-Seob;Park, Yong-Sik;Park, Byoung-Ha;Han, Sok-Kyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.05b
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    • pp.75-78
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    • 2001
  • Recently, the HFPD measurement testing is widely used in partial discharge measurement of HV machines because HFPD measurement testing receives less influence of external noise and has a merit of good sensitivity. Also HFPD testing is able to offer the judgement standard of degradation level of HV machine and can detect discharge signals in live-line. Therefore it is very useful method compare to previous conventional PD testing method and effective diagnosis method in power transformer that requires live-line diagnosis. But partial discharges have very complex characteristics of discharge pattern so it is required continuous research to development of precise analysis method. In recent, the study of partial discharge is carrying out discover of initial defect of power equipment through condition diagnosis and system development of degradation diagnosis using HFPD(High Frequency Partial Discharge) detection. In this study, simulated transformer is manufactured and HFPD occurred from transformer is measured with broad band antenna in real time, the degradation grade of transformer is analyzed through produced patterns in simulated transformer according to applied voltages.

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Spectrum Analysis of VHF/UHF PD in Simulated Transformer (모의 변압기의 VHF/UHF PD 스펙트럼 분석)

  • Kim, Duck-Keun;Kim, Jong-Seo;Lim, Yong-Bae;Lim, Jang-Seob;Moon, Chae-Ju
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05a
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    • pp.50-54
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    • 2000
  • Recently, the HFPD measurement testing is widely used in partial discharge measurement of HV machines because HFPD measurement testing receives less influence of external noise and has a merit of good sensitivity. Also HFPD testing is able to offer the judgement standard of degradation level of HV machine and can detect discharge signals in live-line. Therefore it is very useful method compare to previous conventional PD testing method and effective diagnosis method in power transformer that requires live-line diagnosis. But partial discharges have very complex characteristics of discharge pattern so it is required continuous research to development of precise analysis method. In recent, the study of partial discharge is carrying out discover of initial defect of power equipment through condition diagnosis and system development of degradation diagnosis using HFPD(High Frequency Partial Discharge) detection. In this study, simulated transformer is manufactured and HFPD occurred from transformer is measured with broad band antenna in real time, the degradation grade of transformer is analyzed through produced patterns in simulated transformer according to applied voltages.

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THE TREND OF DIAGNOSTIC METHODS FOR POWER CABLE (전력(電力)케이블 열화진단(劣化診斷) 기술(技術)의 동향(動向))

  • Hahn, K.M.;Kim, D.W.
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.779-783
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    • 1992
  • In recent years, it is strongly required to supply high quality electrical power without insulation failure in distribution power cables. Therefore the exact measurement and judgment ar out deterioration degree of cables are essential to increase that supplying reliability. This paper will introduce various diagnostic methods of off-line and live-line cables also propose the judgement criteria and newly trend of diagnostic technique at present.

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The Experimental Bias in Person Perception as Results of the Method of Developments Stimulus (자극물의 표현방법에 따른 대인지각에서의 편파)

  • 김재숙;김희숙
    • The Research Journal of the Costume Culture
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    • v.12 no.1
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    • pp.28-40
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    • 2004
  • The purpose of this study was (1) to identify the experimental bias which could appear person perception as results of development methods (2) to find out the most desirable method in developments of stimulus. The research was a quasi experiment and the subjects were 358 male and female undergraduate students by convenient sampling. The experimental instruments consisted of a set of stimulus and semantic differential scales of 7-point bi-polar adjectives. The collected data were analyzed by Principle Component Analysis, ANOVA(analysis of variance), Scheffe's multiple range test. The independent variables were developing methods of stimulus(live person, photography of real person, 2 kinds of black and white line drawing, 2 kinds of color drawing). The results were as follows. First, five factors which were potency, sociality, appearance, evaluation, activity impressional dimensions emerged to account for the methods of development of stimulus. Second, the methods of development of stimulus had significant effects on potency, sociality, appearance, activity factors. In sociality factors, the impression of photographic stimulus was the closest to the live person's impression. However in the appearance and activity impressions, significant difference existed between live person and other developing stimulus. In the potency impression, black and white line-drawing gave the highest impressional bias. In the sociability and appearance impressions, color-drawing stimulus gave the highest impressional bias. Result: On conclusion the developments of stimulus can effect on stimulus person's impressions and these effects can produce experimental biases, the photographic stimulus gave the least impressional bias. The study shows that photography of real person will produce minimize measurement error.

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Voltage Measurement Accuracy Assessment System for Distribution Equipment of Smart Distribution Network

  • Cho, Jintae;Kwon, Seong-chul;Kim, Jae-Han;Won, Jong-Nam;Cho, Seong-Soo;Kim, Juyong
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1328-1334
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    • 2015
  • A new system for evaluating the voltage management errors of distribution equipment is presented in this paper. The main concept of the new system is to use real distribution live-line voltage to evaluate and correct the voltage measurement data from distribution equipment. This new approach is suitable for a new Distribution Management System (DMS) which has been developed for a distribution power system due to the connection of distributed generation growth. The data from distribution equipment that is installed at distribution lines must be accurate for the performance of the DMS. The proposed system is expected to provide a solution for voltage measurement accuracy assessment for the reliable and efficient operation of the DMS. An experimental study on actual distribution equipment verifies that this voltage measurement accuracy assessment system can assess and calibrate the voltage measurement data from distribution equipment installed at the distribution line.