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Developments in Power System Protection, 2008. DPSP 2008. IET 9th International Conference on

Date 17-20 March 2008

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Displaying Results 1 - 25 of 141
  • Cover

    Page(s): c1
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  • Inside Cover

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  • DPSP 2008 Conference Proceedings Sponsors

    Page(s): ii
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  • Author Disclaimer

    Page(s): iii - iv
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  • Miscellaneous

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  • Staff

    Page(s): vi
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  • Contents

    Page(s): vii - xiii
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  • Index

    Page(s): xiv - xvii
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  • Blank Page

    Page(s): xviii
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  • Trends in Protection and Substation Automation Systems and Feed-Backs from Cigre Activities

    Page(s): 1 - 13
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    The profitability pressure on utilities as a consequence of market liberalization and other influences is leading to the reconsideration of the entire secondary technology inside the substation. Possible synergies between protection, control and monitoring have to be considered. At the same time, assets have to be used in a more efficient and profitable way and an increased security of energy delivery is required. This is mainly due to the rising costs of non-delivery of electrical energy as well as the negative impacts of blackouts, but also to consumer demands and public opinion. The contribution addresses some feed-backs from CIGRE activities (study committee B5 of CIGRE in charge of protection and automation) and summarises the possible levels of integration, various standardization aspects (mainly IEC 61850). View full abstract»

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  • The Impact of IEC 61850 on Protection

    Page(s): 14 - 19
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    The standard IEC 61850 "communication networks and systems in substations" defines a communication system for substation automation that provides interoperability between equipment from different manufacturers. The standard introduces several new features that will have an impact on the design of a protection system. One example is the introduction of communication services for the exchange of time critical information between intelligent electronic devices (IED) like protection relays. With that, the wiring between the relays used to implement the protection schemes can be eliminated. Other impacts of IEC 61850 are related to HW and SW design of protection equipment, the design, commissioning and testing of a protection system and the required training for protection engineers. All these areas are discussed in that paper. View full abstract»

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  • Impact of IEC 61850 on the Protection Grading and Testing Process

    Page(s): 20 - 25
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    The paper discusses the requirements of the protection grading and testing process from the point of view of exchange of data between different tools used to achieve these tasks. The IEC 61850 substation configuration language and the different types of files are analysed. The CIM and IEC 61850 models are described and requirements for harmonization are presented. View full abstract»

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  • The First National Grid Substation Equipped with a Substation LAN According to IEC 61850

    Page(s): 26 - 29
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    The replacement of a Substation Control System at National Grid's Axminster 400 kV substation due to the existing substation control and protection devices reaching the end of their asset design life, presented the opportunity to develop a new solution with technology based on the suite of IEC 61850 standards. These standards define the substation Ethernet LAN, plant and equipment models and supporting communication services. This paper will present a brief background to the IEC 61850 standards, describe the approach adopted in implementing the project solution and summarise the issues faced, how these were overcome and the key benefits. View full abstract»

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  • Implementing New Generation Protective Relay Schemes based on IEC61850 Standard for Substation Communication in the Eskom 765kV Transmission Network

    Page(s): 30 - 34
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    Eskom is in the process of strengthening the transmission corridor between the North and South of South Africa by constructing a new 765 kV backbone to meet the challenge of increased electricity demand. Eskom's existing substation layouts are based on double busbar arrangements. The approved new extra high voltage (EHV) substations (765 kV and 400 kV) will be based on a breaker-and-a-half substation design. Associated with this upgrade, new generation protective relay schemes for transmission lines (both line impedance and line differential), transformers, reactors and busbars will be implemented. The paper gives an overview of the new substation layout as well as the protective relay scheme architecture. The advantages of using the IEC61850 based protocol between the bay and substation control as well as GOOSE messaging for control of the breaker-and-a-half schemes will be discussed. The paper also describes the test philosophy and how GOOSE messages have been configured to improve the speed and efficiency of commissioning and testing the various schemes. The test procedures as well as test system to achieve a fully automatic test of the complete scheme will be presented. View full abstract»

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  • A Software Substation Interlocking Design Based on IEC 61850

    Page(s): 35 - 37
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    The opportunity to develop a real life IEC 61850 [1] GOOSE [2] application arose during the initial stages of substation refurbishment projects. Existing software based interlocking systems were identified as having to be replaced. This paper details the development of the solution and replacement strategy. It is not the intention to describe interlocking rules. View full abstract»

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  • New Fuzzy Stabilisation Scheme Against Transformer in Rush Currents

    Page(s): 38 - 43
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    A new protection stabilisation system against transformer inrush currents is proposed in the paper. The system makes use of two criteria: correlation coefficients from current waveshape analysis and equivalent instantaneous inductance estimate, combined in a reliable unit by means of fuzzy logic. The scheme performance is verified with the signals obtained from EMTP-ATP simulation. View full abstract»

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  • Differential Protection Methodology for Arbitrary Three-Phase Power Transformers

    Page(s): 44 - 49
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    This paper describes how to provide universal, current based, differential protection for any three-phase power transformer, including phase-shifting transformers with variable phase angle shift and special converter transformers with nonstandard but fixed phase angle shift (e.g. 22.5deg). The use of standard transformer differential protection for such applications is considered impossible in the protective relaying standards and practices currently applied. This universal differential protection method only requires standalone CTs on all sides of the protected transformer. Thus, any buried current transformers within the tank of the protected power transformer are not required regardless transformer construction details and internal on-load tap-changer configurations. View full abstract»

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  • Protection Systems for Railway Traction Transformer

    Page(s): 50 - 55
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    The railway traction transformers are entirely different from the conventional transformer used in transmission & distribution networks from various aspects. The operation, connection & construction of the traction transformer are differing from the normal transformer and hence demand very special protection system requirements. View full abstract»

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  • Application of a New Distance Protection Scheme to a Single-Pole Autotransformver Electrification System on the UK West Coast Main Line Railway

    Page(s): 56 - 61
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    This paper describes the protection scheme implemented on an autotransformer electrification system on the West Coast main line of network rail in the UK. The design is significantly different from autotransformer systems used in continental Europe and the channel tunnel rail link because it uses greater selectivity isolating the faulted line while leaving remaining lines energised. This is important on a heavily used route such as the West Coast main line railway to reduce the impact of power loss. The autotransformer system was first installed on a 40 km section on the West Coast route on a dual double-track section. The protection philosophy proved successful in demonstrating that a discriminating scheme can be achieved. The paper explains the settings methodology for the new system, details of load and fault measurement analysis during operation and discusses the additional issues encountered following commissioning of the first conversion section. View full abstract»

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  • 25 kV AC Railways Overhead Contact System Protection - A Comparison Between the Traditional Approach and Alternative Low Cost Solution

    Page(s): 62 - 67
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    In contrast to the early days of 25 kV AC railway electrification these days new electric traction systems are usually equipped with advanced supervisory control and data acquisition (SCADA) systems as well as intelligent protection devices. Those protection devices come with communication interfaces, permit data acquisition as well as remote parameter setting according to operational needs. By utilising the modern features of the protection and SCADA systems the number of circuit breakers and associated protection equipment may be reduced significantly without compromising safety and reliability of the traction power supply. This paper compares various aspects of overhead contact system protection in the traditional 25 kV AC electric traction system against an alternative solution. Pros and cons of each approach are discussed and potential future developments are proposed. View full abstract»

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  • Introduction of Integrated Protection and Control to Railway Electrification Systems

    Page(s): 68 - 73
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    The UK railway is currently undergoing significant renewals and enhancements to its electrification infrastructure. As part of this, there is a critical need to review future protection and control schemes with a view to reducing the need for substation hard-wiring, together with the capital cost associated with complexity and installation timescales. Network Rail undertakes its own outline design of protection and control systems, and has now developed a design approach to integrated schemes. This paper considers the role of a network operator in producing standard designs for integration, which ensure the benefits of new technology whilst maintaining sufficient design control to provide for interchangeability and ease of future modification. The key issues associated with integration of protection and control systems are discussed, with an emphasis on the processes for design. These are based upon the use of the unified modelling language to describe both the design process and the design itself. The paper sets out a UML approach to specifying an integrated protection and control scheme in accordance with IEC 61850, using a typical railway substation as an example. View full abstract»

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  • Development and Site Trial of a Numerical Pilot-Wire Differential Protection

    Page(s): 74 - 79
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    A new numerical current differential relay that operates by digital communication over metallic pilot circuits has been developed, allowing utilities to re-use their existing pilot-wire protection signalling infrastructure while introducing the benefits of numerical relay technology. Sophisticated techniques were applied to achieve digital communication over metallic pilots without the use of modems. The new relay has been successfully applied in a site trial installation for a period of one year, the trial circuit being a 33 kV cable feeder within the network of the UK utility SP power systems. During the course of the trial a number of faults were experienced on the primary system (both internal and through-faults) for which the protection responded correctly. View full abstract»

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  • Power Differential Protection as Primary

    Page(s): 80 - 85
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    Active power differential protection has recently been proposed as a novel technique to increase the protection reliability of transmission lines and busbars. In comparison with current differential protection, it is more reliable, faster, needs less input parameters and communication devices; those make it suitable to be used as a protection scheme of the wide area backup protection. On the other hand, active power differential protection cannot recognise the faulted phase of the protected object and therefore cannot operate for single pole tripping. In this paper, a new technique has been proposed to resolve the single pole tripping limitation of the active power differential protection. In this technique, when APDP relay produces trip command, an external logic compares per phase differences of the active power flowing at the line ends. For faulted phase, the difference is more than the others. The proposed technique has been evaluated using a MATLAB simulator configured to model effects of different faults on a typical 400 kV transmission line. The method has also been tested on simulated Northern Ireland Electricity (NIE's) 275 kV network to show the effectiveness of the proposed technique for a real system data. Results indicate that the new logic is reliable to be used as single pole tripping detector for APDP algorithm. View full abstract»

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  • Which One Is Better - Line Differential or Directional Comparison?

    Page(s): 86 - 91
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    High-speed protection of transmission lines for faults anywhere in the zone of protection is achieved using unit protection based on communications between the relays at all ends of the line. The paper compares line differential protection with directional comparison protection in order to present the benefits and deficiencies of each of these two protection systems. View full abstract»

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