• Title, Summary, Keyword: Generator protection

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A Study on Design of IED for Generator Protection Panel (발전기보호반을 위한 IED의 설계에 관한 연구)

  • Park, Chul-Won;Park, Sung-Wan
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.62 no.3
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    • pp.133-138
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    • 2013
  • A large generator is an important role in transferring an electric power to power system. The IEDs of large generator often use microprocessor technology to obtain a digital relay system with a wide range of measuring, protection, control, monitoring, and communication functions. However, all generator protection and control systems in Korea imported from abroad and are being operated. In order to reduce the large expense and improve the reliable operation, development of generator protection and control system by domestic technology is required. This paper deals with the design of the IED of generator protection panel for development of generator protection and control system. The major emphasis of the paper will be on the description of hardware and signal processing test results and measurement accuracy of the prototype IED. By developing of generator IED based on DSP and microprocessor, replacement of the generator protection panel imports are expected to be effective.

Application Analysis for Loss of Excitation Relay of Generator Protection (발전기 보호용 계자상실 계전기의 적용 분석)

  • Oh, Yong-Taek;Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.4
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    • pp.322-326
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    • 2014
  • Recently, the LOE(loss of excitation) incidents are occurred in domestic synchronous generator frequently, the synchronous generator protection system has been much attention for the LOE protection of the incidents that threats synchronous generators and power systems. This paper was showed the characteristics and practices of distance relay that widely used LOE protection relaying in generator. Firstly, the operating characteristics and the impedance locus for LOE of the generator protection were introduced. Even if the conventional simulation program is used for modeling, but it is difficult to implement a LOE modeling and simulation of synchronous generator. So, the LOE relay operation data collected from thermal power plant and nuclear power plant in real fields were analyzed. By reviewing the applications of GE Mho relays, the reliability of LOE for synchronous generator protection in domestic were improved.

A Study on Implementation of Multi-Function Prototype IED H/W for Generator Protection (발전기 보호용 다기능 IED 시제품 H/W 구현에 관한 연구)

  • Kim, Yoon-Sang;An, Tae-Pung;Park, Chul-Won
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.12
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    • pp.74-80
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    • 2013
  • Generator faults does not happen more often than the transmission and substation facility faults. However, impacts on the power system by generator faults are very large. In order to minimize the impact of generator faults, generator protection and control system with high reliability is required. Most of the generator relay in generator protection and control system of large power plant of Korea is operated by imports from abroad. Accordingly, in order to accumulate source technology and increase the import substitution effect, localization of multi-function generator protection IED is being developed. This paper deals with the implementation of a multi-function prototype IED H/W, which can be command and data exchange through communication for measuring, monitoring, protection and control. And the IED specification, various relay elements, measurement elements, communication functions, module function, and test system for the prototype IED H/W are described.

Generator Protection Relaying System in Power Plant (발전소의 발전기 보호계전시스템)

  • Kwan, Sung-Kyun;Park, Chul-Won;Lee, Jong-Soo;Lee, Sang-Seung;Shin, Myong-Chul
    • Proceedings of the KIEE Conference
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    • pp.151-152
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    • 2006
  • Because power plant faults have severe effects on the power system and on mechanical maintenance of the generator, reliable protection systems are needed. In this paper, we compared and analyzed methods of the generator protection relaying system, which can defect internal faults of the generator, and surveyed the trends in generator protection using digital computing.

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A Study on the Development of Protection Relay applied a Generator Protection Basic Algorithm (발전기 보호 기본 알고리즘을 적용한 보호계전 연구)

  • Cho, Seong-Jin;Choi, Myeong-Song;Lee, Seung-Jae;Kang, Sang-Hee;Hyun, Seung-Ho
    • Proceedings of the KIEE Conference
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    • pp.326-328
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    • 2003
  • In this paper, in order to generator protection from a electrical fault was occurred while a generator is operated, principles of existing generator protection algorithm is examined and analyzed. and a new generator protection algorithm was developed. also, during a generator operation, Algorithm, an analysis for the basic principle of protective relay to general faults, was developed. This paper, generator was simple analyzed on the assumption that three-phase winding and observe the IEEE std.

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A Study on Loss of Excitation Algorithm for Generator Field Protection (발전기 계자보호를 위한 계자상실 알고리즘에 관한 연구)

  • Park, Yu-Yeong;Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.4
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    • pp.368-372
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    • 2014
  • The most widely used scheme for detecting loss of excitation on generator is used to sense apparent impedance from generator terminals. This paper presents loss of excitation algorithm using DFT filter based negative offset mho elements for generator field protection. It's algorithm includes two negative mho characteristics looking in the generator. The generator control system was modeled by PSCAD/EMTDC software, and then the proposed algorithm was tested by the collecting relaying signals from selected the generator model. From simulation results, the loss of excitation algorithm can be used to field protection for generator.

A Study on the Protective Coordination of Generator Overexcitation and Overvoltage Relay (발전기 과여자 및 과전압 계전기 보호협조에 관한 연구)

  • Park, Ji-Kyung;Kim, Kwnag-Hyun;Kim, Chul-Hwan;Lyu, Young-Sik;Yang, Jeong-Jae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.8
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    • pp.1187-1194
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    • 2017
  • After North American wide area black out on August 14, 2003, various studies have been conducted to find out the reason of the disaster. One of main reasons was misoperation of generator protection system. Since then, protective coordination between generator protection system and excitation system controls has been hot issue among electrical engineers. Among various generator protection relays, in this paper, we focused on generator overvoltage and overexcitation relay, which protect the over-flux condition of the generator. Thus, at first, we modeled the generator overvoltage, overexcitation relay and detailed power system including excitation system, governor and etc., based on actual field data. And then, we reviewed the protective coordination of generator overvoltage and overexcitation relay using electromagnetic transient program. In addition, we discussed the protective coordination method for redundant protection relays in both automatic voltage regulator and generator side.

Digital Ratio Differential Relaying for Main Protection of Large Generator (대형 발전기 주보호를 위한 디지털 비율차동 계전기법)

  • Park, Chul-Won;Ban, Yu-Hyeon
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.61 no.1
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    • pp.35-40
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    • 2012
  • An AC generator is an important component in producing an electric power and so it requires highly reliable protection relays to minimize the possibility of demage occurring under fault conditions. It is a need for research of digital generator protection system(DGPS) for the next-generation ECMS and an efficient operation of protection control system in power station. However, most of protection and control system used in power plants have been still imported as turn-key and operated in domestic. This may cause the lack of the correct understanding on the protection systems and methods, and thus have difficulties in optimal operation. In this paper, presented ratio differential relaying(RDR) is main protective element in generator protection IED. The fault detection technique, operation zone and setting value of the RDR were studied and, compared with two of the fault detection algorithm. For evaluation performance of the RDR, the data obtained from ATPDraw5.7p4 modeling was used. The proposed methods are shown to be able to rapidly identify internal fault and did not operate a miss-operation for all the external fault.

Advanced Algorithm for IED of Stator Winding Protection of Generator System (발전기시스템의 고정자보호 IED를 위한 개선된 알고리즘)

  • Park, Chul-Won
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.2
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    • pp.91-95
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    • 2008
  • The large AC generator fault may lead to large impacts or perturbations in power system. The generator protection control systems in Korea have been imported and operated through a turn-key from overseas entirely. Therefore a study of the generator protection field has in urgent need for a stable operation of the imported goods. In present, the algorithm using the current ratio differential relaying based DFT for stator winding protection or a fault detection had been applied that of internal fault protection of a generator. the DFT used for the analysis of transient state signal conventionally had defects losing a time information in the course of transforming a target signal to frequency domain. In this paper, the discrete wavelet transform (DWT) was applied a fault detection of the generator being superior to a transient state signal analysis and being easy to real time realization. The fault signals after executing a terminal fault modeling collect using a MATLAB package, and calculate the wavelet coefficients through the process of a muiti-level decomposition (MLD). The proposed algorithm for a fault detection using the Daubechies WT (wavelet transform) was executed with a C language and the commend line function for the real time realization after analyzing MATLAB's graphical interface. The advanced technique had improved faster a speed of fault discrimination than a conventional DFR based on DFT.

A Protection Algorithm Discriminating Between Internal and External Faults for Wind Farms (풍력발전단지 보호를 위한 내외부 고장 판별 알고리즘)

  • Kwon, Young-Jin;Kang, Sang-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.5
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    • pp.854-859
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    • 2007
  • A wind farm consists of many wind generator(WG)s therefore, it is generally a complex power system. A wind farm as a distributed generation(DG) affects utility power system. If a conventional protection schemes are applied, it is difficult to detect faults correctly and the schemes can't provide proper coordination in some cases. This paper presents a protection algorithm for a wind farm which consists of a looped collection circuit. Because the proposed algorithm can distinguish between an internal fault and an external fault in a wind farm, The proposed algorithm can disconnect the faulted section in a wind farm. This algorithm is based on an overcurrent protection technique with the change of the ratio of the output current of a generator to the current of the looped line connected to each generator to collect the each generator's power. In addition, operating time of the algorithm is shortened by using the voltage drop at a generator collection point. The performance of the proposed algorithm was verified under various fault conditions using PSCAD/EMTDC simulations.