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03685 A rigorous procedure for optimisation of equi-interval maintenance schedules
06
95103664 tems using
Reliability
evaluation of interconnected gamma distribution
Electric power generation and utilisation (economics, policy, supplies, forecasts)
power sys-
a multi-parameter
Singh, C. and Chintaluri, 17, (2), 1.51-160.
G. M.
Elect. Power & Energy Sysrems, 1995,
The paper presents a continuous distribution method for calculating the reliability indices of a system connected to one or more assisting systems. A multi-parameter distribution consisting of a combination of gamma distributions is used for representing the area generation system models. A cluster-based load model is used for incorporating the hourly load variation and correlation between area loads. Using this load model, one does not need to make assumptions regarding the nature of correlation, i.e. whether perfectly correlated or not. The concept of equivalent generators to represent the assisting systems is used for incorporating the imerconnection effects. The most important contribution to this paper is the expression for frequency of loss of load when loads are not perfectly correlated and therefore the system is non-coherent.
A rigorous procedure for optlmisation 95103665 val maintenance schedules
of equi-lnter-
National Lighting Cant, Cambridge, UK, 1994, CIBSE,
Di Fraia, L. 230-237.
The paper discusses ihe problem of designing an optimised maintenance programme for the first time. Describes a novel procedure for solving it for exisiting indoor lighting installations.
Trsde-off approach in power system planning case 95103690 study: Lebanon Yehia, M. er al., Elect. Power & Energy Sysrems, 1995, 17, (2), 137-142. The paper proposes an approach to power system planning in Lebanon which is constrained by limits on available resources, incomplete information on the nature and distribution of system demand, and uncertainty about future growth. The approach is based on a trade-off method for multiple objective planning under uncertainty where a number of future power supply and demand scenarios at different discount rates are proposed and studied using a production costing program. From these studies, trade-off curves of cost versus unmet energy for electricity supply in Lebanon are determined to provide decision markers with a range of possible generation plans that compromise between cost and unmet energy. Trends in distribution switchgear 95103691 IEE Conference Publication No.400, f35.00, 1994, 182 pp, IEE, London. 95163692 A unified model and automatic contingency selection algorithm for the P end Q subproblems Jizhong, Z. and Guoyu, X. Electric Power Systems Res., Feb. 1995, 32, (2) 101-105. A new approach to automatic contingency selection (ACS) and ranking is presented in this paper. ACS for the P and Q subproblem is solved by a unified network flow model and algorithm. It is based on the existence of weak coupling between real and reactive quamities in power systems. The performance indices to assess the severity of contingencies are defined as the total real and reactive load to be curtailed. The proposed model and its algorithm are examined numerically with IEEE 5-bus, 14-bus, 30-bus, 57bus and 118-bus systems on an M-340 computer.
95103666
Second- and third-zone performance assessment of a symmetrical component based improved fault impedance estimation method
Waikar, D. L. 113-120.
er al,, Electric Power Systems Rex, Feb. 1995, 32, (2).
The performance assessment of a symmetrical component based fault impedance estimation method that has previously been proposed by the authors is discussed in this paper. A brief review of the proposed method is given. The personal computer based Alternative Transient Program was used in these performance assessment studies. Voltage and current signals for various fault conditions were generated bv simulatina different tvoes of fault on a selected transmission-line of a sample po\;er system.’ These signals were processed, sampled, and used in the proposed method. The apparent impedance of the protected transmission line from the relay location up to the fault point was calculated using the proposed method.
Shaping up for the future - Overhead 95103687 for train speeds of up to 400 km/h Tessun, H.
contact lines
ABB Review, 1995, (3), 31-38.
Recent years have seen high-speed rail make considerable progress in many countries, with speeds in excess of 300 km/h already allowed on some routes. For trains- to travel at such speeds, however, -the overhead contact line must satisfy a wide range of operating requirements. Overhead contact lines for soeeds of uo to 400 km/h are bemn develooed and manufactured by ABB’ Henschel’ Bahnstromanlagen GmbH in ‘Munich. ABB played a leading role in the development of the high-performance Re 330 contact line for German Railways.
A study of the use of scale models in the daylight95103688 ing design of museums Cannon-Brookes, CIBSE, 238-246.
S. W.
National Lighting COINS,Cambridge, UK, 1994,
Discusses the problem of balancing the desire for daylight in museum galleries with the conservation-derived restrictions on illumination. Reports on a pilot study in which the appropriate model-making techniques are developed and simultaneous monitoring of illuminance levels are used to compare daylight distribution in a model to a real building.
Thermodynamic models of wet-snow accretion: 95103889 Axial growth and liquid water content on s fixed conductor Poots, G. and Skelton, 43-49.
P. L.
Heat & Fluid Flow, Feb. 1995, 16, (I),
For wet-snow accretion on overhead line conductors, occurring at positive air temperatures, the liquid water content of the snow matrix controls the strength of the capillary forces, promoting contact between ice granules, which leads to ice bonding. During this process of metamorphosis, the liquid water content of the snow matrix increases with time and, on reachinn a level of 20-40%. the internal cohesive forces are ereatlv weakened. ca;sing shedding of the accreted snow by aerodynamic-and gravitational forces. The purpose of this paper is to construct thermodynamic models of wet-snow afcretion, by axial growth on a fixed conductor, which estimate the liquid water content during the accretion process.
95103693 Vanadium battery solar demonstration house Menictas, C. et al., Proc. Solar ‘94, ANZSESAdministralor, PO Box 124, Caulfield East, VIC.3145, Australia. The Vanadium Redox batterv developed at the UNSWs is a high efficiency energy storage system that offers greater benefits over other energy storage svstems for PV couoline. A microorocessor controller built bv the UNSW Centre for PV Systems and Devices is being tested in conjun&on with a 4 kVA grid interactive inverter coupled to the 36 cell vanadium battery stack is described. 95103694 Voltage change Start, D. et al., Elect. Rev., Dec. 1994, 227, (24) 18-24. Three brief articles discuss the effects of the adoption on 1st January of a 230V standard for mains supplies throughout Europe.
1995
95163695 Voltage transients, their effects end the solution Sadiwnyk, M. Health Estate J., Feb. 1995, 49, (l), 3-4. The author points out that multi-billion pound investments in electronics over the last decade, not only in manufacturing and financial communities, but also in evervdav lives. means that catastroohe can be iust a voltane spike away. Use’s as an example the Texaco Refinery at Milford Haven, South Wales, where a lightning strike in 1994 caused fire, and associated voltage surges promptly shut-down the plants monitoring and control system. A waveform oriented electric machine testing sys95163896 tem aided by personal computer Chang, C. H. Electric Power Systems Res., Feb. 1995, 32, (2). 153-159. The paper presents a personal computer (PC) aided testing system that retrieves rotor speed, voltage, current and power factor of AC (singlephase or three-phase) and DC electric machines and displays them in nme domain waveform formats. Taking advantage of the displayed waveform profiles, users are able to achieve a better understanding of electric machiens than by using instruments typically adopted in the laboratory. The proposed testing system can be applied not only to ordinary electric machine experiments but also to special-topic studies in the undergraduate laboratory. Both the hardware configuration and software techniques instrumental in building the system are presented. 95163697 Wonkey waves - A sine of the future Dawn, T. Elect. Rev., Feb. 1995, 228, (3) 32-34. Discusses the quality of electricity supply, interruptions, disturbances and their causes and effects. At oresent in the UK standards mainlv concern interruption and restoration of the supply but in 1995 European Standard EN 50160 may be included in the distribution code. Reports on surveys in Germany and- Italy on fluctuations in voltage, frequency transients,. and short interruptions of power.
Economics,
Policy, Supplies,
Forecasts
95103898 Comments on Stlrllng’s ‘Dlvsrslty and Ignorance In electrlclty supply investment’ Brower, M. Energy Policy, Feb. 1995, 23, (2), 11.5-116. The paper was published in the March 1994 issue of Energy Policy.
Fuel and Energy Abstracts
July 1995
267
95103664 tems using
Reliability
evaluation of interconnected gamma distribution
Electric power generation and utilisation (economics, policy, supplies, forecasts)
power sys-
a multi-parameter
Singh, C. and Chintaluri, 17, (2), 1.51-160.
G. M.
Elect. Power & Energy Sysrems, 1995,
The paper presents a continuous distribution method for calculating the reliability indices of a system connected to one or more assisting systems. A multi-parameter distribution consisting of a combination of gamma distributions is used for representing the area generation system models. A cluster-based load model is used for incorporating the hourly load variation and correlation between area loads. Using this load model, one does not need to make assumptions regarding the nature of correlation, i.e. whether perfectly correlated or not. The concept of equivalent generators to represent the assisting systems is used for incorporating the imerconnection effects. The most important contribution to this paper is the expression for frequency of loss of load when loads are not perfectly correlated and therefore the system is non-coherent.
A rigorous procedure for optlmisation 95103665 val maintenance schedules
of equi-lnter-
National Lighting Cant, Cambridge, UK, 1994, CIBSE,
Di Fraia, L. 230-237.
The paper discusses ihe problem of designing an optimised maintenance programme for the first time. Describes a novel procedure for solving it for exisiting indoor lighting installations.
Trsde-off approach in power system planning case 95103690 study: Lebanon Yehia, M. er al., Elect. Power & Energy Sysrems, 1995, 17, (2), 137-142. The paper proposes an approach to power system planning in Lebanon which is constrained by limits on available resources, incomplete information on the nature and distribution of system demand, and uncertainty about future growth. The approach is based on a trade-off method for multiple objective planning under uncertainty where a number of future power supply and demand scenarios at different discount rates are proposed and studied using a production costing program. From these studies, trade-off curves of cost versus unmet energy for electricity supply in Lebanon are determined to provide decision markers with a range of possible generation plans that compromise between cost and unmet energy. Trends in distribution switchgear 95103691 IEE Conference Publication No.400, f35.00, 1994, 182 pp, IEE, London. 95163692 A unified model and automatic contingency selection algorithm for the P end Q subproblems Jizhong, Z. and Guoyu, X. Electric Power Systems Res., Feb. 1995, 32, (2) 101-105. A new approach to automatic contingency selection (ACS) and ranking is presented in this paper. ACS for the P and Q subproblem is solved by a unified network flow model and algorithm. It is based on the existence of weak coupling between real and reactive quamities in power systems. The performance indices to assess the severity of contingencies are defined as the total real and reactive load to be curtailed. The proposed model and its algorithm are examined numerically with IEEE 5-bus, 14-bus, 30-bus, 57bus and 118-bus systems on an M-340 computer.
95103666
Second- and third-zone performance assessment of a symmetrical component based improved fault impedance estimation method
Waikar, D. L. 113-120.
er al,, Electric Power Systems Rex, Feb. 1995, 32, (2).
The performance assessment of a symmetrical component based fault impedance estimation method that has previously been proposed by the authors is discussed in this paper. A brief review of the proposed method is given. The personal computer based Alternative Transient Program was used in these performance assessment studies. Voltage and current signals for various fault conditions were generated bv simulatina different tvoes of fault on a selected transmission-line of a sample po\;er system.’ These signals were processed, sampled, and used in the proposed method. The apparent impedance of the protected transmission line from the relay location up to the fault point was calculated using the proposed method.
Shaping up for the future - Overhead 95103687 for train speeds of up to 400 km/h Tessun, H.
contact lines
ABB Review, 1995, (3), 31-38.
Recent years have seen high-speed rail make considerable progress in many countries, with speeds in excess of 300 km/h already allowed on some routes. For trains- to travel at such speeds, however, -the overhead contact line must satisfy a wide range of operating requirements. Overhead contact lines for soeeds of uo to 400 km/h are bemn develooed and manufactured by ABB’ Henschel’ Bahnstromanlagen GmbH in ‘Munich. ABB played a leading role in the development of the high-performance Re 330 contact line for German Railways.
A study of the use of scale models in the daylight95103688 ing design of museums Cannon-Brookes, CIBSE, 238-246.
S. W.
National Lighting COINS,Cambridge, UK, 1994,
Discusses the problem of balancing the desire for daylight in museum galleries with the conservation-derived restrictions on illumination. Reports on a pilot study in which the appropriate model-making techniques are developed and simultaneous monitoring of illuminance levels are used to compare daylight distribution in a model to a real building.
Thermodynamic models of wet-snow accretion: 95103889 Axial growth and liquid water content on s fixed conductor Poots, G. and Skelton, 43-49.
P. L.
Heat & Fluid Flow, Feb. 1995, 16, (I),
For wet-snow accretion on overhead line conductors, occurring at positive air temperatures, the liquid water content of the snow matrix controls the strength of the capillary forces, promoting contact between ice granules, which leads to ice bonding. During this process of metamorphosis, the liquid water content of the snow matrix increases with time and, on reachinn a level of 20-40%. the internal cohesive forces are ereatlv weakened. ca;sing shedding of the accreted snow by aerodynamic-and gravitational forces. The purpose of this paper is to construct thermodynamic models of wet-snow afcretion, by axial growth on a fixed conductor, which estimate the liquid water content during the accretion process.
95103693 Vanadium battery solar demonstration house Menictas, C. et al., Proc. Solar ‘94, ANZSESAdministralor, PO Box 124, Caulfield East, VIC.3145, Australia. The Vanadium Redox batterv developed at the UNSWs is a high efficiency energy storage system that offers greater benefits over other energy storage svstems for PV couoline. A microorocessor controller built bv the UNSW Centre for PV Systems and Devices is being tested in conjun&on with a 4 kVA grid interactive inverter coupled to the 36 cell vanadium battery stack is described. 95103694 Voltage change Start, D. et al., Elect. Rev., Dec. 1994, 227, (24) 18-24. Three brief articles discuss the effects of the adoption on 1st January of a 230V standard for mains supplies throughout Europe.
1995
95163695 Voltage transients, their effects end the solution Sadiwnyk, M. Health Estate J., Feb. 1995, 49, (l), 3-4. The author points out that multi-billion pound investments in electronics over the last decade, not only in manufacturing and financial communities, but also in evervdav lives. means that catastroohe can be iust a voltane spike away. Use’s as an example the Texaco Refinery at Milford Haven, South Wales, where a lightning strike in 1994 caused fire, and associated voltage surges promptly shut-down the plants monitoring and control system. A waveform oriented electric machine testing sys95163896 tem aided by personal computer Chang, C. H. Electric Power Systems Res., Feb. 1995, 32, (2). 153-159. The paper presents a personal computer (PC) aided testing system that retrieves rotor speed, voltage, current and power factor of AC (singlephase or three-phase) and DC electric machines and displays them in nme domain waveform formats. Taking advantage of the displayed waveform profiles, users are able to achieve a better understanding of electric machiens than by using instruments typically adopted in the laboratory. The proposed testing system can be applied not only to ordinary electric machine experiments but also to special-topic studies in the undergraduate laboratory. Both the hardware configuration and software techniques instrumental in building the system are presented. 95163697 Wonkey waves - A sine of the future Dawn, T. Elect. Rev., Feb. 1995, 228, (3) 32-34. Discusses the quality of electricity supply, interruptions, disturbances and their causes and effects. At oresent in the UK standards mainlv concern interruption and restoration of the supply but in 1995 European Standard EN 50160 may be included in the distribution code. Reports on surveys in Germany and- Italy on fluctuations in voltage, frequency transients,. and short interruptions of power.
Economics,
Policy, Supplies,
Forecasts
95103898 Comments on Stlrllng’s ‘Dlvsrslty and Ignorance In electrlclty supply investment’ Brower, M. Energy Policy, Feb. 1995, 23, (2), 11.5-116. The paper was published in the March 1994 issue of Energy Policy.
Fuel and Energy Abstracts
July 1995
267