• Title/Summary/Keyword: Electrical Equipments

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Study on The Suppression Method for Lightning Surge invaded into House (가옥내 침입 뇌서지 억제방안 검토)

  • Lee, Suck-Woo;Whang, Kyu-Hyun;Seo, Ho-Joon;Rhie, Dong-Hee
    • Proceedings of the KIEE Conference
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    • 2004.11d
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    • pp.43-45
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    • 2004
  • Damages of lightning surge for low voltage equipments in the house are increasing due to electronic equipments working in more and more low voltage and becoming smaller. And that is increasing due to increase communication networks in the information-oriented society. So, to achieve effective method of surge protection, there are needs for correlation between indoor wire and propagation aspect of lightning surge. Therefore this paper describes as a result of experiments for propagation aspect of lightning surge according to arrangement of indoor wire.

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Analysis of the Utilization Characteristics of Electrical Power and Equipments on the Farms (농촌의 전력및 전기기기의 이용특성분석)

  • 박승우;류한열
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.17 no.4
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    • pp.3943-3955
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    • 1975
  • The purposes of this study are to evaluate the utilization characteristics of electrical power consumption, to grasp the present trends in the use of electrical equipments, to estimate the demand factor and load factor being held, and to evaluate the efficiency of electical uses for the recently electrified farms cultivating paddy rice. For the purposes, 109 sample farms located in eleven villiages electrified in six different years from 1968 to 1973, were chosen at random and investigated on 35 items concerning to electrical uses and wiring systems. The survey was carried out in 1975, in the vinicity of Suweon city. The results are summarized as follows: i) The average annual power consumption on sample farms is considered to be low, being 242.9 Kwh. in 1974, and varied according to the different electrified year and size of cultivated land, respectively. It has significant positive correlation to the area of farm, too. ii) Between the number of year of electrical uses and the power consumption, there is very significant positive correlation, which could be expressed as Y=43.041+16.108 X, where X represents the number of years of electrical uses. The annual increment of power consumption is much greater at the beginning of the electrification than that at the later years, its average being approximately 20 percent. However, it is recommended that any estimation of long-term increments should be carefully investigated. iii) The monthly power consumption varies considerably throughout a year, in which the heaviest farm load occurs in November. Observing the seasonal variation of consumption, the winter-time is the heaviest season while the summer is the lowest. The result implies house lighting is chief contribution to the present electrical consumption on the farms. Comparing the variation of monthly consumption ratios between the sample farms and industries, the electrical uses on the farms are independant of the industrial uses, and further, the agricultural uses are of inverse pattern to the farms from the results that there is negative correlationship between them, iv) The number of electrical equipments used on the farms are occupied chiefly by lighting sources. Next to the lighting sources, household appliances of small quantity and some motors are used. The mean electrical quantity is about 1, 127.4 watt, which corresponds to about 37.6 per cent to the contracted quantity. The composition of quantity is chiefly occupied by the electrical motor of about 1.5 hp., single-phased. The number of the annual utilization hours of each equipment is tabulated in Table IV-5. In contradiction to the high utilization of lighting sources and small household appliances, the motor is poorly used for approximately 22 hours in a year. v) More than 55 per cent of farms want to purchase new electrical equipments such as small household appliances and electrical motors in their number. The impulse of purchasing such items is stimulated by the contacts to the mass media and their knowledge on such equipments. Consequently, the increase of electrical uses could be prompted by such trials as education and demonstration. vi) The demand and load factors on the farms vary considerably according to the greater variation of the power consumption, daily or monthly. The daily demand factor is 22.4 per cent and load factor 18.6 per cent, while the annual demand factor is 1.3 per cent and load factor 70 per cent approximately. Therefore, the low efficiency of construction cost requires re-evaluation of the present contracted quantity of 3 Kw. or increase of electrical uses. vii) The electrical energy on the farms devoted chiefly to lighten the farm residences does not contribute to the farm incomes. Consequently, the cost of electrical consumption presses considerably upon the farm economy. Therefore, there is great need to build up the electrical uses on the farms through the development of new works and techinques to utilize any electrical equipments on the production of farm products. Further more, such the development should be related to increase the actual income of the farm consumers.

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A Development of Effective Total Educational System of Electrical Engineering for Automobile Engineer (효과적인 자동차 전기공학교육을 위한 총괄 교수 - 학습 시스템의 개발)

  • Son, Il-Moon;Lee, Joong-Soon
    • Journal of Engineering Education Research
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    • v.9 no.3
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    • pp.67-77
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    • 2006
  • This paper is concerned with the effective and efficient teaching-learning method with experimental equipments in automobile engineering. For deriving this educational methodology, teaching-learning methods being valuable in engineering education, and troubles and demands for experimental equipments in teaching and learning area are surveyed and reviewed. In results, we suggest the concept of total educational system considering and systemizing an experimental equipment as well as various educational materials such as courseware, teaching and experimental guide, virtual simulator, and operating manual, and so develop the total educational system of electrical engineering for automobile and suggest the application of this system on instruction process.

Single-Stage Quasi Resonant Type PSR(Primary Side Regulation) PWM Converter for the LED Drive in TRIAC Phase Controlled Dimmer (TRIAC위상 제어 조광기에서의 LED구동을 위한 Single-Stage 준 공진형 PSR(Primary Side Regulation) PWM 컨버터)

  • Han, Jae-Hyun;Lim, Young-Cheol;Jung, Young-Gook
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.2
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    • pp.84-94
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    • 2013
  • In case when the existing TRIAC phase controlled dimmer is drove for the LED lighting equipments, there are many problems such as the LED flicker in low phase-angles, the acoustic noise and elements damage by increase of the peak voltage in the input filter capacitor, mulfunction by insufficiency of the TRIAC holding current, and the abnormal oscillation by LC resonant. In this paper, we proposes the single-stage quasi-resonant PSR(Primary Side Regulation) PWM converter, and the design, the simulation and experiment are performed. As a result, it could confirm that the proposed PWM converter is the lighting equipments for LED drive which can alternate the existing 60W class incandescent bulbs and it has the high drive performance of the efficiency 80% and over, the power factor 0.95 and over under the normal voltage 220V. Finally, total harmonic distortion(THD) is gratified with a standard[1] of the lighting equipments and the durability is evaluated as the high reliablilty of 150,000 hours and over.

A Study of Ground System improvement on Isolated Power Generation (독립 전원설비에서의 접지방법 개선에 관한 연구)

  • 류보혁;남택주;김정훈
    • Journal of the Korean Society of Safety
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    • v.16 no.4
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    • pp.96-102
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    • 2001
  • In construction sites, portable generators and electrical equipments cause frequently electrical accidents due to the poor condition of their usage. However, there are very few technical guidelines on these equipments even though they have serious accident causing potentiality. In order to reduce such accidents in practical and economical, grounding methods are studied in this paper as the countermeasure of electrical accidents. Several Korean national standards and international standards regarding three grounding types are compared each other, and some prevention means of electrical accidents are reviewed in this study. This paper presents the most effective grounding methods by assuming the WCS with the isolated power systems.

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Electrical Interfaces Compatibility Analysis for the COMS TWTA (통신해양기상위성 진행파관증폭기 전기접속 적합성 해석)

  • Koo, Ja-Chun;Choi, Jae-Dong
    • Aerospace Engineering and Technology
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    • v.7 no.1
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    • pp.108-114
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    • 2008
  • The aim of this analysis is to verify the electrical compatibility of the interfaces which exist between TWTA(Travelling Wave Tube Amplifier) which is equipment of the Ka-band payload in COMS (Communication, Ocean and Meteorological Satellite) and external equipments. For each interface, this study checked the compatibility between equipments for the power links, commands, digital telemetry, analog telemetry, and failure condition or AIT(Assembly, Integration and Test) errors. In addition with this interface compatibility verification, this study outputs electrical and manufacturing recommendations to be applied at harness level.

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Development of on-line system using electromagnetic wave for diagnosis of deteriorated power equipment (전자파 검출에 의한 전력기기 On-Line 열화 측정시스템 개발)

  • Kang, C.W.;Choi, G.S.;Lee, Y.S.;Kim, C.W.;Kang, D.S.
    • Proceedings of the KIEE Conference
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    • 2001.07c
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    • pp.1664-1666
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    • 2001
  • This paper presents the development of electromagnetic wave detecting equipment for diagnosis of enclosed switchboard. High voltage power equipments are very important equipment of the key industries and the private enterprise. Power line accidents are national plans because of those set off casualties lose of power equipments and communication networks. Therefore the necessity of the development of detecting for power equipment diagnosis is demand for prevention of high voltage equipment accidents. This paper is the development of electromagnetic wave detecting equipment for diagnosis of high voltage equipment. This paper establishes the diagnosis method for high voltage power equipments, that secures original technique and possesses detecting technique for electromagnetic wave. By the study we developed electromagnetic wave detector, and we applied this equipment application tests at the place constructed high voltage equipments.

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