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Improving Supply Security on 11kV Overhead Networks, IEE Colloquium on

Date 1988

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Displaying Results 1 - 25 of 28
  • Developments in microprocessor controlled sectionalisers

    Publication Year: 1988, Page(s):23/1 - 23/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (200 KB)

    In the past, overhead lines have been protected by the use of fuses. However fuses, being open to the elements, need regular maintenance and, when a fuse has operated, a field visit for replacement. A further disadvantage of fuses is that they cannot detect low levels of earth fault current. The authors describe how the versatility of the microprocessor controlled relay has been exploited to modif... View full abstract»

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  • Improvement in rural network performance (power system security)

    Publication Year: 1988, Page(s):5/1 - 5/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    Following the October 1987 hurricane in the UK, a reappraisal of engineering policies indicated that the only significant weakness was in Engineering Recommendation P 2/5 on security of supply, which did not address the problem of small groups of customers who regularly experience several supply interruptions each year. In order to tackle the problem of small Working Party was set up in South East... View full abstract»

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  • Further developments in distribution switchgear for overhead networks

    Publication Year: 1988, Page(s):24/1 - 24/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (96 KB)

    Continuous development has been taking place in switchgear for overhead distribution networks. The author presents an update of the position of developments at the moment and discusses auto reclosers, sectionalisers and system automation View full abstract»

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  • The design of overhead electric lines for improved security

    Publication Year: 1988, Page(s):1/1 - 1/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    The author describes the background and some aspects of the new design approach which was developed in anticipation of the 1988 Electricity Supply Regulations and used in the preparation of ESI Standard 43-40 `High Voltage Single Circuit Overhead Lines on Wood Poles'. The author demonstrates that to design for improved security at reasonable cost requires careful reconsideration of every aspect of... View full abstract»

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  • Hurricane force [power overhead lines]

    Publication Year: 1988, Page(s):17/1 - 17/2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (100 KB)

    The hurricane which hit the south east of England on the 16th October 1987 had a devastating effect on electricity supplies. It was apparent that previous refurbishment programmes had been ineffective in preventing damage, in particular the tree timing programme. The author looks at how future programmes may work in order to prevent so much damage View full abstract»

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  • Use of fault recorders to provide information during overhead line fault location and supply restoration procedures

    Publication Year: 1988, Page(s):18/1 - 18/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    Northern Ireland Electricity are investigating various methods of optimising the application of telecontrol. The objective is for the control centre staff and field staff to work as a team with the control centre staff being able to co-ordinate the activities of the field staff more effectively because of the information available. A further objective is to minimise the need for field staff to vis... View full abstract»

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  • Operation of an isolated neutral 10 kV system

    Publication Year: 1988, Page(s):20/1 - 20/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    The Electricity Supply Board, Ireland, (ESB) 10 kV distribution system is in the main operated as an isolated neutral system, except in Dublin, where the 10 kV network has a resistance earthed neutral. The Dublin network is a cabled network. The author deals with the operational practices and procedures used in the operation of the isolated neutral 10 kV system and with the further development of ... View full abstract»

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  • Influence of cost benefit techniques on the design of rural networks

    Publication Year: 1988, Page(s):11/1 - 11/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Cost benefit analysis has played an important part in the design of Eastern Electricity's rural networks since the early 1970s. Initial applications were rule of thumb approaches (the familiar kVA km methods), however with the wider availability of computer facilities a number of the techniques have been refined to enable designs to be tailored for local network needs. The reliability techniques d... View full abstract»

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  • The co-ordination of reclosers, fuses and protection gaps

    Publication Year: 1988, Page(s):28/1 - 28/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    Prior to 1984 the 11 kV overhead system in the North Yorkshire District of NEEB has suffered significant disruption during abnormal weather conditions and in particular lightning. As a first stage in attempting an improvement to the system its fault performance was studied in detail and one network in particular was singled out for remedial action. The network selected was fed from Sheriff Hutton ... View full abstract»

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  • The co-ordination of protection and auto-reclose on 11 kV distribution networks

    Publication Year: 1988, Page(s):19/1 - 19/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    The authors describe the co-ordination between the main line auto-reclosing circuit breaker and the fuse protection of a spur of an 11 kV distribution network. The relay has an instantaneous overcurrent set at 300 A, an instantaneous earth fault set at 120 A and an overall fault clearance time of 0.1 seconds View full abstract»

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  • Rural protection policy for long overhead networks

    Publication Year: 1988, Page(s):8/1 - 8/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (108 KB)

    The distribution of electricity to rural areas of Northern Ireland is by means of wood pole overhead lines energised at 11000 volts. The lines are supplied from three phase 33/11 kV transformers which have star connected 11 kV windings with the neutral star point solidly earthed. Many people live in isolated homesteads on the land that they farm and this makes low voltage distribution impracticabl... View full abstract»

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  • Investment for improved supply security

    Publication Year: 1988, Page(s):2/1 - 2/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (140 KB)

    In a period when high interest charges and high labour costs coincide, investments dedicated to a sole objective of widespread improvements of security on an initially sound 11 kV overhead power system are often difficult to support. The authors report on the long term measures initiated as part of a distribution asset replacement programme by the South of Scotland Electricity Board and the opport... View full abstract»

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  • Automatic detection and indication of supply state on remote sections of overhead lines

    Publication Year: 1988, Page(s):15/1 - 15/2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (100 KB)

    In common with many other supply authorities, Northern Ireland Electricity has no method of determining remotely whether supply is off or on beyond automatic sectionalising devices on rural overhead line networks. To improve service to the consumer some method of providing this information at the distribution control centres was considered desirable, possibly by utilising the public telephone netw... View full abstract»

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  • Monitoring protection and switchgear performance on distribution systems

    Publication Year: 1988, Page(s):21/1 - 21/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    Security of supply on 11 kV overhead line networks depends on many factors from the mechanical strength of the supports and conductors to the speed and discrimination of the protection and switchgear. Protection and switchgear must be considered together since it is their combined behaviour which determines how much of the network is disconnected when a fault occurs. Assessment of the performance ... View full abstract»

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  • Fault handling techniques used by the ESB on 10 kV networks in rural Ireland

    Publication Year: 1988, Page(s):13/1 - 13/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    The rural ESB 10 kV overhead network is operated with its neutral isolated from ground and consists of more than 18000 km of three phase, three wire backbone lines which feed a network of more than 54000 km of two phase, two wire lines. The author examines fault handling techniques used on 10 kV networks under three headings, earth faults, transient short circuits, and nontransient short circuits.... View full abstract»

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  • IEE Colloquium on `Improving Supply Security on 11kV Overhead Networks' (Digest No.134)

    Publication Year: 1988
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (12 KB)

    The following topics were dealt with: overhead power line design; supply security improvement; investment policies; overhead network construction; insulator pollution monitoring; rural distribution network performance, switchgear, operation and testing; sectionaliser applications; power system protection; power system telecontrol; fault location; and network reliability View full abstract»

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  • Reliability of rural distribution systems in developing countries

    Publication Year: 1988, Page(s):16/1 - 16/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    The authors highlight some difficulties which influence the reliability of overhead primary distribution networks in developing countries. The performance characteristics and reliability of distribution systems in developing countries are constrained by the following factors: limited convertible (hard) currency; a scarcity of experienced and trained personnel in the power engineering sector; clima... View full abstract»

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  • Network 21C-an update [overhead system protection]

    Publication Year: 1988, Page(s):12/1 - 12/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    Three distinct stages of overhead power system operation have evolved in East Midland Electricity. Experience has shown that the majority of faults affecting the overhead system were transient, nondamage, and that the best performance, in terms of the lowest `customer-hours lost' was achieved with minimum numbers of strategically positioned fuses, coupled with automatic reclosing 11 kV switches. T... View full abstract»

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  • Remote automatic signalling system

    Publication Year: 1988, Page(s):25/1 - 25/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    The Northern Ireland Electricity (NIE) rural 11 kV distribution system is controlled by switchgear with automatic tripping and reclosing facilities operated by protection relays. This equipment is located either at 33/11 kV substations as circuit breakers or on overhead lines as ACR's and sectionalisers. In Craigavon area a network of 500 km of 11 kV overhead line is fed from 40 substations with 2... View full abstract»

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  • The electronic automatic sectionaliser link (power system protection)

    Publication Year: 1988, Page(s):7/1 - 7/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (96 KB)

    The author describes electronic automatic sectionaliser links (sometimes known as ERICs) which have now become well established as a means of protection for overhead power line networks. There are probably around 1000-1500 such units currently installed on overhead lines, in locations as diverse as the North of Scotland, the Midlands and the South West of England. Their operating principles are gi... View full abstract»

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  • Non-damage fuse operations on 11kV overhead lines

    Publication Year: 1988, Page(s):6/1 - 6/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (120 KB)

    Most 11 kV overhead line fuses are connected to spurs beyond a ground mounted circuit-breaker or, beyond a pole mounted circuit-breaker that is being operated as a source circuit-breaker. Group fusing, as above, has replaced the use of fuses in series and, largely, the fusing of individual transformers. However, even with group-fusing and the wide implementation of auto-reclosing, most fuse operat... View full abstract»

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  • Rural distribution system automation

    Publication Year: 1988, Page(s):27/1 - 27/9
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    The authors review current practice with the application of automatic sectionalising systems on distribution networks and consider recent developments in new pole top equipment to facilitate the extension of these systems. Some specification refinements are also considered. They describe three technically feasible methods of achieving automation of overhead high voltage distribution circuits. They... View full abstract»

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  • Early warning pollution monitor for overhead line insulators to secure power supply

    Publication Year: 1988, Page(s):4/1 - 4/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    The dominant fault in overhead power line systems is the flashover of insulators irrespective of voltage level. The authors examine the result of nearly ten years of extensive research and development work into an online insulator pollution monitoring system. Such a technique is described which depends upon the repetition of leakage current bursts to a certain set triggering value. The authors pre... View full abstract»

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  • An integrated actuator design for pole-mounted airbreak isolator [power system security]

    Publication Year: 1988, Page(s):14/1 - 14/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (116 KB)

    The generally agreed desirability of remote control of 11 kV overhead network, so as to be able, in conjunction with other measures, to improve supply security, would be frustrated without an actuator with some form of energy store to operate the ubiquitous pole mounted airbreak isolator. The authors describe the design of an integrated actuator to carry out such operations. This actuator contribu... View full abstract»

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  • A low cost surveillance and remote control system for improving the performance of 11 kV overhead networks

    Publication Year: 1988, Page(s):26/1 - 26/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    2.7 million customers in the UK are supplied from 11 kV overhead networks. On average, they lose their supply for about 4 hours each year compared with about 30 minutes for their counterparts in urban areas fed from underground cables. The reducing costs and increasing reliability of microprocessors have enabled Electricity Boards to install large telecontrol systems for the remote control of thei... View full abstract»

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