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58th Annual Conference for Protective Relay Engineers, 2005.

Date 5-7 April 2005

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Displaying Results 1 - 25 of 36
  • 2005 58th Annual Conference for Protective Relay Engineers (IEEE Cat. No.05EX997)

    Publication Year: 2005
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  • Copyright page

    Publication Year: 2005, Page(s): ii
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  • 58th Annual Conference for Protective Relay Engineers

    Publication Year: 2005, Page(s): iii
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  • Forward

    Publication Year: 2005, Page(s): iv
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  • [Breaker page]

    Publication Year: 2005, Page(s): v
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  • Table of contents

    Publication Year: 2005, Page(s):vi - vii
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  • Generator characteristics and their influence on relaying

    Publication Year: 2005, Page(s):1 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1814 KB) | HTML iconHTML

    This paper describes the design constants of large generators and their influence on protective relaying. The detailed nature of machine impedances, fault currents, the phasor diagrams for round-rotor and salient pole machines, saturation curves and the causes of overvoltage. The aggravated influence of unbalanced currents, and the relationship of the connected system to the generator grounding sc... View full abstract»

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  • Staged-fault testing for high impedance fault data collection

    Publication Year: 2005, Page(s):9 - 17
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2325 KB) | HTML iconHTML

    Faulted lines must be repaired and returned to service in the shortest possible time to provide reliable service to the customers. Fault detection is an important aspect of system protection, as it involves personnel as well as equipment safety. The research on high impedance fault (HTF) detection techniques is mainly based on conventional methods, familiar to the power system engineers. TXU Elect... View full abstract»

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  • High-speed distribution protection made easy: communications-assisted protection schemes for distribution applications

    Publication Year: 2005, Page(s):18 - 26
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1660 KB) | HTML iconHTML

    Communications-assisted protective schemes in transmission applications have been in service for decades. Recommendations for scheme application are well established, depending on the type of channel. Communications typically used for transmission line applications include power-line carrier, microwave, and optical fiber. With more emphasis being placed on distribution system reliability, there is... View full abstract»

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  • Power transformer neutral grounding reactor application and distribution feeder protection issues at CenterPoint Energy

    Publication Year: 2005, Page(s):27 - 39
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1676 KB) | HTML iconHTML

    This paper discusses the ramifications of grounding a substation power transformer through a reactor on the CenterPoint Energy distribution system. The purpose of the reactor is to reduce the magnitude of ground fault currents. This is expected to increase transformer life expectancy by significantly reducing transformer short circuit forces. The higher ground impedance provided by the neutral gro... View full abstract»

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  • Application of peer-to-peer communication, for protection and control, at Seward distribution substation

    Publication Year: 2005, Page(s):40 - 45
    Cited by:  Papers (5)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1726 KB) | HTML iconHTML

    This paper discusses application of high-speed peer-to-peer communication over local area network (LAN) as a tool that helps Cinergy to achieve reduction in installation, commissioning, upgrade, maintenance and operation costs. Exchange of UCA Generic object oriented substation event (GOOSE) messages between relays connected to the LAN is successfully used for the breaker failure, accelerated prot... View full abstract»

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  • Understanding power system stability

    Publication Year: 2005, Page(s):46 - 67
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1316 KB) | HTML iconHTML

    This paper discusses the causes of power system instability and the importance of fast fault clearing. The k-constant model is used to explain the relationships among the following: small signal stability, high impedance transmission lines, line loading and high gain, fast acting excitation systems. Various types of power system instability, utilizing both mathematical and practical approaches, ar... View full abstract»

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  • Implementation and operational experience of a wide area special protection scheme on the SRP system

    Publication Year: 2005
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1544 KB) | HTML iconHTML

    Summary form only given. As the existing transmission system infrastructure is challenged to support loads beyond original design limits, the implementation of "wide area" power system protection systems (PSPS) are often needed to maintain transmission system integrity. Such a system, with stringent performance and availability requirements, has recently been designed and installed on the salt riv... View full abstract»

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  • Practical considerations for single-pole-trip line-protection schemes

    Publication Year: 2005, Page(s):69 - 85
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1808 KB) | HTML iconHTML

    This paper discusses some practical aspects of implementing single-pole tripping schemes in transmission-line protection. Implementation and techniques will vary in the design of protective relaying systems that implement single-pole trip (SPT), as well as in the philosophy of the users applying these devices; however, the intent is to discuss issues that need to be considered for SPT systems. We ... View full abstract»

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  • SVC protection and control basics (for Entergy's porter SVC with external capacitor bank switching)

    Publication Year: 2005, Page(s):86 - 95
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1684 KB) | HTML iconHTML

    The static VAr compensator provides reactive power and voltage support to the transmission system by switching local SVC capacitors and by switching remote capacitor banks. The fast capacitor switching in the SVC is accomplished by using light triggered thyristors, and remote capacitor switching will be handled by the SVC controls, transmission operation centers, remote terminal units (RTUs), and ... View full abstract»

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  • Implementation of an unconventional voltage slide scheme

    Publication Year: 2005, Page(s):96 - 111
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1885 KB) | HTML iconHTML

    Eskom experienced a voltage collapse condition in part of its subtransmission network. The network consists of a number of subtransmission substations that are interconnected and fed from three transmission substations. The voltage collapse condition occurred after a protection operation cleared a fault on one of the 132 kV lines feeding the network from one of the transmission substations. Networ... View full abstract»

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  • Successful DG projects: design and build considerations

    Publication Year: 2005, Page(s):112 - 119
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2694 KB) | HTML iconHTML

    These four projects are in service in three different utility jurisdictions. They are connected to the distribution lines and a 69 kV customer-owned substation. The need for these facilities varied with each location, and the economic studies showed a good payback for this DG investment. Two of the projects are in southern California and are installed on the process industries distribution deliver... View full abstract»

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  • Generator protection and CT saturation problems and solutions

    Publication Year: 2005, Page(s):120 - 126
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1688 KB) | HTML iconHTML

    This paper presents a new generator relay design, stator differential function in particular, coping with extreme cases of current transformer (CT) saturation: both AC saturation under large currents and/or residual flux; and DC saturation under low currents but large and long lasting DC components. The algorithm is a subcycle algorithm with fastest times reaching half a cycle including overall re... View full abstract»

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  • Fundamentals of a motor thermal model and its applications in motor protection

    Publication Year: 2005, Page(s):127 - 144
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1783 KB) | HTML iconHTML

    This paper discusses the fundamentals of a motor thermal model and its mathematical interpretation and physics for the different stages of motor operation, (overload, locked rotor, too frequent or prolonged acceleration, duty cycling applications). It explains thermal model time constants and other technical aspects causing the biasing of the thermal model algorithm. Other topics covered in this p... View full abstract»

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  • Arc flash hazard analysis and mitigation

    Publication Year: 2005, Page(s):145 - 157
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1902 KB) | HTML iconHTML

    Recently enacted guidelines and regulations regarding arc flash hazards have focused industry attention on quantifying the dangers of arc flash events in energized low and medium voltage electrical equipment. Since incident energy from an arcing fault is directly proportional to the arc clearing time, reducing the arcing time is very beneficial. It results in reducing the PPE level requirements an... View full abstract»

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  • Secure application of transformer differential relays for bus protection

    Publication Year: 2005, Page(s):158 - 168
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1940 KB) | HTML iconHTML

    The greatest challenge of bus differential protection is dealing with false differential current due to CT saturation. Percentage-restrained differential relays are often applied for bus differential protection applications. The percentage restraint principle provides security by requiring that the differential current exceed some percentage of the current flowing through the zone. There are few a... View full abstract»

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  • A tutorial for distribution protective relay applications

    Publication Year: 2005, Page(s):169 - 188
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2318 KB) | HTML iconHTML

    This paper is a tutorial covering relay applications in distribution networks. For relay engineers, projects involving distribution systems take up the majority of their time. In many cases, attrition has robbed them of their mentors, leaving an experience void that is difficult to fill. This paper will give them help in understanding the various methods used to protect equipment in distribution s... View full abstract»

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  • Aggressive electromechanical relay panel replacement project at TXU electric delivery

    Publication Year: 2005, Page(s):189 - 193
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2139 KB) | HTML iconHTML

    TXU electric delivery is quite similar to most utility companies in the United States that have been around for over 100 years. There is always a need to track aging equipment and to decide when it is time to maintain, repair or replace equipment and that includes relays. For several years the issue of what to do with aging electromechanical relaying systems had been discussed and several possible... View full abstract»

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  • Automation of HV substations in Iberdrola: experiences and plans

    Publication Year: 2005, Page(s):194 - 200
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1724 KB) | HTML iconHTML

    The automation of substations in Iberdrola, has experienced a maturing process during the last decade. During the 1980's Iberdrola built prototype installations. Those trial projects where the basis for the development and generalized application of technically and economically feasible solutions implemented during the 1990's. The paper describes the architecture of current substations detailing t... View full abstract»

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  • The importance of site selection for series compensation

    Publication Year: 2005, Page(s):201 - 210
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4367 KB) | HTML iconHTML

    The location of a series capacitor bank influences both cost and design. End-line applications make protection schemes easier but can increase costs associated with older relays at nearby substations affected by the voltage reversal phenomenon. Contrarily, mid-line applications can reduce relay replacement costs but makes protection more difficult. Entergy recently studied mid-line and end-line ap... View full abstract»

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