• Title/Summary/Keyword: watt-hour

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Lifetime Assessment of Electronic Watt-hour Meters (전자식 전력량계의 수명평가)

  • Seol, Ieel-Ho;Park, Jung-Won
    • Journal of Applied Reliability
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    • v.9 no.1
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    • pp.37-45
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    • 2009
  • Recently mechanical watt-hour meters are being replaced by electronic watt-hour meters. The replacement period of mechanical watt-hour meters is 7 years. This period is based on long term historical data. The replacement period of electronic watt-meters is also 7 years. This period is determined using the replacement period of mechanical watt-hour meters. However lifetime of mechanical watt-hour meters is different from the lifetime of electronic meters. In order to determine desirable replacement period of electronic watt-hour meters, accelerated life tests of major components in electronic watt-hour meters were performed. The test results showed that LCD was the component which had the shortest lifetime. In this paper, lifetime of electronic watt-hour meters manufactured by 3 company was estimated and life test standard for LCD was developed.

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Development of ADWHM(Advanced Digital Watt-Hour Meter) for Remote Management of Distribution Systems (배전원격관리를 위한 차세대 디지털 적산전력계 개발)

  • 고윤석;윤상문;서성진;강태규
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.6
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    • pp.316-323
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    • 2004
  • This paper develops an ADWHM(Advanced Digital Watt-Hour Meter) which integrates and implements the voltage management data record function and the load management data record function in the electronic watt-hour meter. ADWHM is developed based on PIC16F874 which is 8bit micro-controller of RISK type for the easy of programing and maintenance, and electronic power signal processing module is located at front of it to reduce the computing load of processor. Also, a 16kbyte EEPROM is used to record the voltage management data and load management data for a week as well as watt-hour data and USART communication mode is used to transfer data from ADWHM to PC. The accuracy of the voltage and unt measuring for ADWHM is verified by identifying the LCD display values of the ADWHM after the voltage signals of id levels from digital function generator is applied to PT(Potential Transformer) and CT(Current Transformer) output under state which it is separated from real power line. On the its basic functions such as watt-hour data recording function, voltage management data recording function and load management data recording function was verified by showing data for three days among the collected data to PC by RS232C communication from ADWHM which was connected to real power lines for a week.

Watt-Hour Metering Characteristics at Scott Transformer in AC Electric Railway Systems

  • Lee, Hansang;Lee, Kyebyung;Kim, Kisuk;Park, Yong-Up;Jeon, Young-Soo;Joo, Sung-Kwan;Jang, Gilsoo;Park, Chang-Hyun
    • Journal of Electrical Engineering and Technology
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    • v.13 no.3
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    • pp.1398-1406
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    • 2018
  • Owing to the consistent increase in accurate analysis issue for energy consumption of the AC electric railway systems, there is controversy about the adequacy of the present watt-hour metering configuration. Due to the unusual load characteristics and facilities, the discussions have not been active. Therefore, in order to achieve more accurate watt-hour metering for AC electric railway system, this paper proposes numerical formulas for watt-hour metering that reflects the highly-varying characteristics of the railway load and the structural characteristics of the Scott transformer. The proposed formulas have been verified by comparison with site-measured data, and a more suitable metering configuration for AC railway system has been proposed.

Development of Watt-Hour Meter Exchange Equipment without Outage (전력량계 무정전 교체장치 개발에 관한 연구)

  • Jung, Tae-Hoon;Cho, Sung-Min;Shin, Hee-Sang;Lee, Hee-Tae;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.8
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    • pp.99-103
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    • 2009
  • This paper presents equipment that can exchange watt-hour meters without outage for customers, It is simpler than other methods to avoid outage during exchange. Furthermore, it has protective function to ensure customer's facility from engineer mistake. Because of good point mentioned above, it can improve efficiency and safety. Adopting developed equipment can ensure continuous electric power supply to customers.

A Study on the Development of ADWHM(Advanced Digital Watt-Hour Meter) (차세대 디지털 적산전력계 개발에 대한 연구)

  • Ko, Yun-Seok;Yun, Sang-Moon;Seo, Seong-Jin
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.262-264
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    • 2003
  • This paper develops an ADWHM(Advanced Digital Watt Hour Meter) based on RISK type'8bit micro-controller, which has voltage management data recording function, load management data recording function as well as the existing watt-hour data recording data function. It can enhance greatly the economics of the existing remote meter reading system. Also it can improve highly the quality of power supplied to the electric customer by minimizing the voltage management cost and by enhancing the efficiency of load management.

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Implementation of ANSI C12.22 Communication Protocol for Two-way Communications of Smart Meter (스마트미터의 양방향 통신을 위한 ANSI C12.22 통신 프로토콜 구현)

  • Lee, Sang-Il
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.4
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    • pp.815-821
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    • 2013
  • In this paper, application layer protocol of C12.22 node, defined by ANSI C12.22 is implemented. ANSI C12.22 defines application layer only among the OSI 7 layers and recommends using the existing protocols for the 1~4 layer to transmit the information. TCP/IP which is one of the generally used protocols has been applied for the transport and network layer protocol in this paper. ANSI C12.19 defines the parameters for the watt-hour meter, and C12.22 application layer defines the network services and data structures networking the watt-hour meter parameters at a minimum. This kind of services and data structures are used for the configuration, programming, monitoring of the networked watt-hour meter or collecting information of the watt-hour meter. A embedded board has been used to implement the C12.22 application layer and a test program for the AMI application server has been developed for the functional test.

Distribution Remote Management System Design and Program Development Based on ADWHM(Advanced Digital Watt-Hour Meter) (차세대 디지털 적산전력계에 기반한 배전원격관리시스템 설계 및 프로그램 개발)

  • Ha Bok-Nam;Ko Yun-Seok
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.4
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    • pp.185-192
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    • 2005
  • This paper proposes a DRMS(Distribution Remote Management System) which can enhance highly the economics of automatic metering system and the power quality supplied to the electric customer improving the efficiency of the meter reading, voltage management and load management work by realizing the remote meter reading, the remote voltage management and the remote load management based on the ADWHM(Advanced Digital Watt Hour Meter). The DRMS is designed so that the voltage management and load management work in remote site can be processed by collecting the voltage pattern and current pattern as well as watt hour data from all ADWHMs one time every month regularly or from special ADWHMS several time irregularly, A new on-line voltage and load management strategy based on the ADWHM is designed by analyzing the existing voltage management and load management process. Also, DRMS is designed so that watt-hour data, voltage pattern data, load pattern data and power factor data can be collected selectively according to the selection of user to assist effectively the methodology. Remote management program and database of the DRMS are implemented based on Visual C++, MFC and database library of MS. Also, DRMS is designed so as to communicate with the ADWHM using RS232C-TCP/IP converter and ADSL. The effectiveness of the remote metering function is proven by collecting and analyzing the data after ADWHMs installed in any site. The developed strategy and program also is verified through the simulation of voltage management and load management.

Power Quality Monitoring with Electronic Watt-hour meter and Wireless communication module (전자식 전력량계와 무선모듈을 이용한 전력품질 표시 및 모니터링)

  • Jung, Deug-Il;Son, Young-Dae
    • Proceedings of the KIEE Conference
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    • 2007.10c
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    • pp.172-174
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    • 2007
  • An electronic watt-hour meter with high-precision measurement technology can provide many valuable metering data of a real-time system measurements, such as per-phase voltage, ampere, active power, reactive power, apparent power, power factor, and system frequency. Also many of accumulated metering data such as active energy, reactive energy, apparent energy, and load profile can be gettable from an electronic watt-hour meter[1]. This paper presents an approach of the small-sized AMR (Automatic Meter Reading) that provides customers with a very valuable electrical service. This AMR service transmits lots of a valuable metering data by using ZigBee communication module, so that users resided in their premises can use the information to audit a power quality and improve their electrical conditions by using the PQ monitoring device equipped with ZigBee receiver. This PQ monitoring device shows metering data on LCD and transmits to the PC through an internal network. Also, the device can keep the valuable meter data into a built-in non-volatile memory. The final goal of this paper is to better understand the power quality of electrical systems and offer the power qualify information for the convenience of all power consumers.

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The Study on the Design of the Function and Data Structure for Electronic Watt-Hour Meters (원격검침을 위한 전자식 전력량계 기능과 데이터구조 설계에 관한 연구)

  • Jang, M.J.;Hyun, D.H.;Cho, S.K.
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.308-310
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    • 2001
  • With the development of Computer & Communication Technology, nowadays many people are interested in remote metering, and many vendors are suggesting various remote metering solutions. KEPCO (Korea Electric Power Corporation) adopts some of these to some customers who uses a lot of electric power, also continues researching them. But, currently used electronic watt-hour meters vary in terms of communication protocol and data structure by the vendors. So we have to know each vendor's communication protocol and data structure to construct a remote metering system, or to find problems in it. But that's impossible to know each vendor's protocol and data structure because they are reluctant to tell those to outside the company. To solve these problems and to make a much more cost-effective metering system, KEPCO developed standard communication protocol between meters and PC (or metering server), and defined standard functions and data structure which can be used by everyone easily. Those developments support standard interface for every vendors' meters. And Those will be adopted by KEPCO for a part of a new metering standard for electronic watt-hour meters.

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