• 제목/요약/키워드: Electrical Installations

검색결과 161건 처리시간 0.043초

전력 설비 진단을 위한 무선 센서의 응용 (Application of Wireless Sensor for Diagnostics of Electric Equipments)

  • 윤주호;최용성;황종선;이경섭
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2008년도 제39회 하계학술대회
    • /
    • pp.2112-2113
    • /
    • 2008
  • The concept is based on distributed wireless sensors that are attached to the incoming and outgoing power lines of secondary substations. A sensor measures only phase current characteristics of the wire it is attached to, is not synchronized to other sensors and does not need configuration of triggering levels. The main novelty of the concept is in detecting and locating faults by combining power distribution network characteristics on system level with low power sampling methods for individual sensors. This concept enables the sensor design to be simple, energy efficient and thus applicable in new installations and for retrofit purposes in both overhead and underground electrical distribution systems.

  • PDF

직류 급전시스템 성능검증을 위한 시험방안 분석 (An analysis of tests process for verification of DC Traction system performance)

  • 정호성;한문섭;장동욱;이기원
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2008년도 춘계학술대회 논문집
    • /
    • pp.499-504
    • /
    • 2008
  • DC substation of urban transit supplies a suitable DC power on electricity vehicles by being supplied from KEPCO. DC substation is verified electrical safety of system through pre-operation inspection on electrical installations to be supplied power from KEPCO. However, because test items and method for DC traction system are unprepared on pre-operation inspection, the general safety and performance verification of DC traction system are very insufficient. Therefore this paper analyze the overseas test examples such as factory equipment tests, factory combined tests and railway tests for the safety and performance verification of DC traction system and present a suitable test items and test standard in domestic.

  • PDF

대용량 마이크로웨이브 다중 슬롯 도파관의 연구 (Study on the Multislotted Waveguide for the High Power Microwave)

  • 백주원;유동욱
    • 대한전기학회논문지:전기물성ㆍ응용부문C
    • /
    • 제52권1호
    • /
    • pp.47-54
    • /
    • 2003
  • The radiating multislotted antennas widely used in the antennas technique are rather prospective for the application in industrial installations for microwave heating. In this paper, the model of such an antenna is experimentally investigated. The model under investigation presents a section of the waveguide Inn 340 whose broad wall contains 15 movable slotted plates. This design allows to experimentally define a location of all the slots providing the necessary distribution of radiating power along the waveguide with minimal SWR of all the system. The variants of power uniform distribution along the waveguide as well as the power decreasing to the waveguide end are examined. The application of plates with different thickness allowed to estimate the influence of the walls thickness on the Power distribution. The possibility of system extra-tuning with the help of tuning screws located in the vicinity of each slot is considered. Obtained results are compared to the conducted theoretical calculations and data in references.

국제표준(IEC 62305) 도입에 따른 피뢰시스템 검사 및 유지관리에 대한 연구 (A Study on a Regulation Draft of Inspection and Maintenance for Lightning Protection Facilities based on IEC 62305)

  • 이강희;이상협;구경완
    • 전기학회논문지
    • /
    • 제64권5호
    • /
    • pp.838-844
    • /
    • 2015
  • Latest development of ICT makes building, including houses, factories and public facilities, more intelligent and automatized. It follows that a wide variety of electric and ICT installations are adopted along with micro electronic equipments. Corresponding to such changes, the frequency of lightning increases due to the abnormal climate. The major damage by lightning surge is disconnection and malfunction of facilities. It is necessary, therefore, to make a regulation of inspection and maintenance for lightning protection facilities. This paper deals with main issues of a regulation draft of inspection and maintenance for lightning protection facilities based on IEC 62305

전기설비 검사제도 현황 및 개선방안 연구 (A situation of electrical installations testing system and its counterplan)

  • 임승학;황민수;신경수;김종인
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2007년도 제38회 하계학술대회
    • /
    • pp.2062-2063
    • /
    • 2007
  • WTO/TBT 협정 및 제조물책임법(PL : Product Liability Law)이 시행됨에 따라 전기설비 공사 시 안전성 확보는 전기공사의 최우선 과제로 정부 및 전기관련 단체에서는 안전에 대한 연구가 활발하다. 정부는 안전관리 강화를 위한 조치로 전기설비 검사제도와 관련하여 전기사업법이 매년 부분적으로 개정되고 있다. 그러나, 개정내용의 대부분은 사용전검사(점검)등 신규시설물 검사에 대한 범위에만 주안점을 두고 있기에 우리협회를 비롯하여 전기관련 단체 및 기술자들은 실질적인 안전강화에 대한 의견을 지속적으로 제시하고 있다. 본 연구는 현재 전기설비 검사제도의 실태를 되짚어보고 외국의 전기설비 검사제도 운영을 검토하여 보다 합리적인 발전방안을 제시하고자 한다.

  • PDF

도시철도 전식방지 조사보고 현황 (Investigation for the Report of DC Traction Stray Current Protection)

  • 이현구;하태현;정호성;한문섭;배정효
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2008년도 추계학술대회 논문집
    • /
    • pp.281-285
    • /
    • 2008
  • Corrosion of metallic structures arises when an electric current flows from the metal into the electrolyte such as soil and water. The potential difference across the metal-electrolyte interface, the driving force for the corrosion current, can emerge due to a variety of temperature, pH, humidity and resistivity etc.. With respect to a given structure, a stray current is to be defined as a current flowing on a structure that is not part of the intended electrical circuit. Stray currents are caused by other cathodic protection installations, grounding systems and welding posts, referred to as steady state stray currents. But most often traction systems like railroads and tramlines are responsible for large dynamic stray currents. This type of stray current is generally results from the leakage of return currents from large DC traction systems that are grounded or have a bad earth-insulated return path. This paper investigates the reports, which is made for protecting the electrical corrosion by the DC traction stray current before the construction period.

  • PDF

반구형 접지모의시스템을 이용한 접지전극의 형상에 따른 대지전위상승의 분석 (The Analysis of Ground Potential Rise for Shapes of Grounding Electrode Using Hemispherical Grounding Simulation System)

  • 길형준;최충석;이복희
    • 대한전기학회논문지:전기물성ㆍ응용부문C
    • /
    • 제54권7호
    • /
    • pp.319-325
    • /
    • 2005
  • In order to analyze ground potential rise of grounding system installed in buildings, the hemispherical grounding simulation system has been designed and fabricated as substantial and economical measures. Ground potential rise(GPR) has been measured and analyzed for shapes of grounding electrode using the system in real time. The system is apparatus to have a free reduced scale for conductor size and laying depth of a full scale grounding system and is constructed so that a shape of equipotential surface is nearly identified a free reduced scale with a real scale when a current flows through grounding electrode. The system was composed of a hemispherical water tank, AC Power supply, a movable potentiometer, and test grounding electrodes. The test grounding electrodes were fabricated through reducing grounding electrode installed in real buildings such as rod type, mesh grid type. When a mesh grid type was associated with a rod type, GPR was the lowest value. The proposed results would be applicable to evaluate GPR in the grounding systems. and the analytical data can be used 0 stabilize the electrical installations and prevent the electrical disasters.

비점화(非點火)(Non-Incendive)형(型) 방폭(防爆) 전기기기(電氣機器)의 구조특성(構造特性) 및 평가방법(評價方法) (Constructional Properties and Evaluation Methods of the Non-Incendive Type of Explosion-Proof Electrical Apparatus)

  • 최상원;이관형;문정기
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1994년도 하계학술대회 논문집 A
    • /
    • pp.110-113
    • /
    • 1994
  • In the hazardous areas where explosive substances in the form of gases, vapor or mists exist, electrical apparatus and installations must be of explosion-proof construction to prevent or limit the danger of the ignition of potentially explosive atmosphere. In Korea, six types of protection have been specified in the government regulations at present: flameproof enclosure, pressurization, oil immersion, increased safety, intrinsic safety, and special types. If electrical apparatus are made of explosion-proof construction in a way other than five above-mentioned types, and their performance is tested and approved by the reponsible authorities, they may be categorized as special type apparatus. In this paper, we introduced a special type of explosion-proof electrical apparatus, called non-incendive type, and presented its constructional requirements. We also investigated evaluation methods of non-incendive type apparatus to assure the explosion-proof performance, and proposed a new classification method of hazardous areas using probabilistic concept.

  • PDF

임펄스전압에 의한 토양의 이온화에 따른 접지성능의 향상 (Improvements of Grounding Performances Associated with Soil Ionization under Impulse Voltages)

  • 김회구;이복희
    • 전기학회논문지
    • /
    • 제65권12호
    • /
    • pp.1971-1978
    • /
    • 2016
  • In this paper, electrical and physical characteristics associated with the ionization growth of soil under impulse voltages in a coaxial cylindrical electrode system to simulate a horizontally-buried ground electrode were experimentally investigated. The results were summarized as follows: Transient ground resistances decreased significantly by soil ionization. The voltage-current (V-I) curves for non-ionization in soil lined up in a straight line with the nearly same slope that is the ground resistance, but they showed a 'cross-closed loop' of ${\infty}$-shape under ionization. The conventional ground resistance and equivalent soil resistivity were inversely proportional to the peak value of injected impulse currents. On the other hand, the equivalent ionization radius and time-lag to the maximum value of ionization radius were increased with increasing the incident impulse voltages. An analysis method for the transient ground resistances of the ground electrode based on the ionization phenomena was proposed. The proposed method can be applied to analyze the transient performances of grounding systems for lightning protection in power system installations.

아파트 전기설비에서의 고조파 실태 분석 연구 (A Study on the Harmonic of the electrical Installations in Apartment Housing)

  • 이기홍;성세진
    • 조명전기설비학회논문지
    • /
    • 제15권2호
    • /
    • pp.105-110
    • /
    • 2001
  • 본 연구에서는 아파트의 각종 전력설비에서 고조파 실태와 영향을 파악하기 위하여 이를 측정하고 분석하였다. 그 결과 세대에 전력을 공급하는 전등전열변압기에서는 제5고조파, 동력변압기에서는 제5고조파 및 제7고조파가 많이 발생되는 것으로 분석되었다. 또한 아파트 수변전설비의 인입점에서 측정한 전압의 종합왜형률(THD) 은 평균 2.4[%]로서 비교적 양호한 것으로 나타났으나, 향후 가전기기의 대용량화 추세에 따라 아파트의 전력설비 계획에서도 고조파에 대한 고려가 필요한 것으로 분석되었다.

  • PDF