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00475 Calculation and harmonic analysis of transient inrush currents in three-phase transformers
05 UK policy for nu&ar deoommiaaioning Surrey,1. Energy Policy, Sep. 1994, 22, (9), 723-724. The article is baaedon UK Nuclear Decommissioning Policy Time for Decision by GordonMacKerron,John Surrey and Steve Thomas (of the Science Policy Research Unit), published by the UK Radioactive Waste Management Advisory Committee, 3 May 1994. The work was undertaken under a Research Centre Award from the UK Economic and Social Research Council, with co-funding from the UK Radioactive Waste Management Advisory Council.
%low66
Q5/00457
1995 world dlractoty of nuclaar utlllty manaQamant
American Nuclear Society, La Grange Park, IL.60525, uSA, $250.00. The directory contains over 3,300 names including more than a thousand
changes from nuclear utility wide listings, Indexesnables,
the 1994 edition. Pmvides names and addresses of key personnel, both corporate and plant management. Worldincluding operating plants and those under construction. capacity projections, operational data, and much more.
06 ELECTRIC POWER
GENERATION AND UTILISATION Scientific,
Technical
Adjuatabla apaad AC drive ?? yatama for North Saa Q5/00455 gaa plpallnaa Weber, K. M. ABE Review, 1994, (9), 4-9. Beginning in 1996, gas from Troll, Europe’s largest offshore gas field, will flow through pipelines from Norway to users in Europe. The huge compressors for the gas transport will be driven by ABB Megadrive systems. Five in all have been ordered. Each has a synchronous motor rated at 39.2 MW, with a shaft speed which is adjustable between 70 and 105 percent of the nominal value. Fully equipped drive systems were recently put through rigorous tests at full and part load. The drives satisfied the test requirements in every respect. Advancad coal-fired power plants axpiolt high tam95/00469 paratura technology f;ts$enreuther, H. Modern Power Systems, Oct. 1994, 14, (lo), 43,45,
I
.
Further improvements to proven fossil fired electricity generating plant technology are increasin iy being demanded by utilities in Europe, North America and the Orient. f tudles . in Europe including the COST programme indicate that highly supercritical systems such as ABB’s ‘high-temperature concept’ may represent the most economic alternative to coal gasification and pressurized fluidized bed combustion. Q5lOO470 A piication of anargy baaed indlcaa In ganarating ayatam railabl PIty analyala TEk;;; S. er al., Electrical Power & Energy Systems, 1994, 16, (5), . The loss of load expectation (LOLE) is the most frequently used reliability index in generating system reliability analysis. Energy based reliability indices, however, are receiving more -&d m&e attention, particularly with regard to systems that have energy limitations or with regard to systems that include intermittent sources. In this paper, the use of energy based reliability indices, such as the expected unserved ener y and thi energy index of unreliability, is compared with the use of L 8 LE in generating system reliability analysis. Q5f00471
Appllcatlon of partltlonlng tachnlquaa for dacomposing large-acaia ?? iactrlc power networks Temraz, H. K. ef al., Electrical Power & Energy Systems, 1994, 16, (S), **_. *a,. .Y”l-WY. Two efficient heuristic algorithms for solving cluster oroblems associated with partitioning of powe; networks are presented in ihis paper.
Electric power generation and utilisation (scientik technical)
Automatic train protactlon wlth fart data %I00473 tranamiaalon Blomqvist, L. and Lind, H. ABB Review, 1994, (8), 28-35. Automatic train nmtection relies on transnonders Installed between the rails sending codeb signals in just fractions bf a second to the train’s power car. Information is contained in the signals which tells the driver about approaching spd restrictions and the status of the signals ahead. A new eneration of m-track and trackside equipment developed by ABB Signal for its new ATP system, EBICAB 900, has a much greater transmission capacity than comparable systems, in part because it uses a larger telegram format. Finnish State Railways is the first railway administration to install the new system. 95lOO474 A bogia for the next ganamtion of alactric and dlaaal-alactrlc locomotlvaa Schwendt,L. MB Review, 1994, (8), 13-19. ABB Henschell has developed a bogie for the coming generation of locomotives that meets operators’ requirements for speeds of up to 250 km& high tractive effort, smooth runnin and good economy. The new running eear unites nroven features of the !l exifIoat boaie with the advantages of ihe traction ‘m?tor anrl gearing arrangement usea in Germany’s ICE >wer ;;.$s dnve umt has also been developed for tractIon motors rated up
.
.
Calculation and harmonic analyala of tranaiant 95100475 inruah currant8 In thraa-phaaa tranaformara Ye-to: C. er al., Electric Power Sysrems Res., Jul.-Aug. 1994, 30, (2), Measurements of transient inrush currents in three-phase transformers offer important data for power system operation and protection. Because threephase transformers are wider used in industrial applications than singlephase transformers, the inrush current of the three- hase transformer is worthy of investigation. The paper proposes a simp‘;e method, extended from that for single-phase transformers to investigate three-phase transformer inrush currents. Harmonic analysis of the inrush currents is carried out. Various structures of three-phase transformers, including winding connections and loading conditions, are discussed. The simulation results are compared with ex erimental results. The proposed method is simple and effective for trans Pormer banks and five-limb transformers. The harmonic analysis of inrush currents is useful for protective relay design. 95100476 A compact algorlthm for tha steady-atata ?? acurlty aaaaaamant of power ayatama r;;f4.. S. et al., Electric Power Systems Res., Jul.-Aug. 1994, 30, (2), Security assessment is selected as one of the aspects of power system operations in most need of improvement and best suited to improvement through the use of emerging compact algorithm technologies. The paper examines some of the issues involved in actually making these improvements. 95100477 Contalnarlzad ?? ubatatlona ratad to 170 kV - Tha fart anawar to powar ?? upply bottlanacka Zahn, B. ABE Review, 1994, (9), 23-30. Electric utilities in many parts of the world are havin difficulty coping emg concentrated with steep rises in local demand caused by companies %* on industrial estates and in commercial centres. Containerized substations can help to solve this problem. Planned, delivered and installed in a relatively short time, they are a proven alternative to conventional outdoor and indoor substations with air- or gas-insulated switchgear. Containerized substations are also useful as stopgaps for utilities or companies modemizing their substations. Q5/00475 Currant dlatribution In A.C. multi+trand auparconductlng cables Tsuda, M. et al., Cryogenics, ICEC Supplement, 1994, 34, 555-558. In AC. multi-strand superconducting cables, AC. quench current is much less than that of D.C. This A.C. quench current degradation is caused by A.C. loss, mechanical damage by cabling! non-uniform current distribution among strands due to self and mutual inductances between strands and different electrical resistivity at the joint between superconducting strands and coooer current lead. The current distribution in non-insulated 7- and (6+1)&and cables applying A.C. transport current are calculated and the influence of contact electrical resistivity on current redistribution in uench process and in stationary state is investigated. The current redistrl‘bution characteristics of non-insulated strand cable and those of insulated strand cable are compared. s.
95100472 An archltactura for tha lntalllgant datactlon and allavlation of ovarloadad tranamlaaion line8 King, R. L. and Novosel, D. Electric Power Systems Rex, Sep. 1994, 30, (3‘ . ,.),241-249. A new control strategy is proposed that offers intelligent solutions to the problem of alleviating overloaded lines. The subsystems used consist of Hnifical neural nehvorits, a holographic associative-memory, and a knowiedge based expert system.
Daalgn for small electric machlnaa f44.95, $64.95, John Wiley & Sons Lid, Bafins Lane,
PO1 9 I LID, UK, Sept. 1994, 300 pp.
Recent developments in electrical and magnetic materials, plus the widesoread auolication of CAD uackanes have created much activitv in this aiea - 0;; of great commerdial in&rtance. This is a compreheniive text which highlights advances in design technique and in materials. The author covers various design procedures, illustrating the first specification to the prediction of performance. The inclusion of both electrical and mechanical aspects of engineering makes this book unique. It is aimed at both practising electrical, electronic, and mechanical engineers, and advanced students.
Fuel and Energy Abatracta January 1995
27
%low66
Q5/00457
1995 world dlractoty of nuclaar utlllty manaQamant
American Nuclear Society, La Grange Park, IL.60525, uSA, $250.00. The directory contains over 3,300 names including more than a thousand
changes from nuclear utility wide listings, Indexesnables,
the 1994 edition. Pmvides names and addresses of key personnel, both corporate and plant management. Worldincluding operating plants and those under construction. capacity projections, operational data, and much more.
06 ELECTRIC POWER
GENERATION AND UTILISATION Scientific,
Technical
Adjuatabla apaad AC drive ?? yatama for North Saa Q5/00455 gaa plpallnaa Weber, K. M. ABE Review, 1994, (9), 4-9. Beginning in 1996, gas from Troll, Europe’s largest offshore gas field, will flow through pipelines from Norway to users in Europe. The huge compressors for the gas transport will be driven by ABB Megadrive systems. Five in all have been ordered. Each has a synchronous motor rated at 39.2 MW, with a shaft speed which is adjustable between 70 and 105 percent of the nominal value. Fully equipped drive systems were recently put through rigorous tests at full and part load. The drives satisfied the test requirements in every respect. Advancad coal-fired power plants axpiolt high tam95/00469 paratura technology f;ts$enreuther, H. Modern Power Systems, Oct. 1994, 14, (lo), 43,45,
I
.
Further improvements to proven fossil fired electricity generating plant technology are increasin iy being demanded by utilities in Europe, North America and the Orient. f tudles . in Europe including the COST programme indicate that highly supercritical systems such as ABB’s ‘high-temperature concept’ may represent the most economic alternative to coal gasification and pressurized fluidized bed combustion. Q5lOO470 A piication of anargy baaed indlcaa In ganarating ayatam railabl PIty analyala TEk;;; S. er al., Electrical Power & Energy Systems, 1994, 16, (5), . The loss of load expectation (LOLE) is the most frequently used reliability index in generating system reliability analysis. Energy based reliability indices, however, are receiving more -&d m&e attention, particularly with regard to systems that have energy limitations or with regard to systems that include intermittent sources. In this paper, the use of energy based reliability indices, such as the expected unserved ener y and thi energy index of unreliability, is compared with the use of L 8 LE in generating system reliability analysis. Q5f00471
Appllcatlon of partltlonlng tachnlquaa for dacomposing large-acaia ?? iactrlc power networks Temraz, H. K. ef al., Electrical Power & Energy Systems, 1994, 16, (S), **_. *a,. .Y”l-WY. Two efficient heuristic algorithms for solving cluster oroblems associated with partitioning of powe; networks are presented in ihis paper.
Electric power generation and utilisation (scientik technical)
Automatic train protactlon wlth fart data %I00473 tranamiaalon Blomqvist, L. and Lind, H. ABB Review, 1994, (8), 28-35. Automatic train nmtection relies on transnonders Installed between the rails sending codeb signals in just fractions bf a second to the train’s power car. Information is contained in the signals which tells the driver about approaching spd restrictions and the status of the signals ahead. A new eneration of m-track and trackside equipment developed by ABB Signal for its new ATP system, EBICAB 900, has a much greater transmission capacity than comparable systems, in part because it uses a larger telegram format. Finnish State Railways is the first railway administration to install the new system. 95lOO474 A bogia for the next ganamtion of alactric and dlaaal-alactrlc locomotlvaa Schwendt,L. MB Review, 1994, (8), 13-19. ABB Henschell has developed a bogie for the coming generation of locomotives that meets operators’ requirements for speeds of up to 250 km& high tractive effort, smooth runnin and good economy. The new running eear unites nroven features of the !l exifIoat boaie with the advantages of ihe traction ‘m?tor anrl gearing arrangement usea in Germany’s ICE >wer ;;.$s dnve umt has also been developed for tractIon motors rated up
.
.
Calculation and harmonic analyala of tranaiant 95100475 inruah currant8 In thraa-phaaa tranaformara Ye-to: C. er al., Electric Power Sysrems Res., Jul.-Aug. 1994, 30, (2), Measurements of transient inrush currents in three-phase transformers offer important data for power system operation and protection. Because threephase transformers are wider used in industrial applications than singlephase transformers, the inrush current of the three- hase transformer is worthy of investigation. The paper proposes a simp‘;e method, extended from that for single-phase transformers to investigate three-phase transformer inrush currents. Harmonic analysis of the inrush currents is carried out. Various structures of three-phase transformers, including winding connections and loading conditions, are discussed. The simulation results are compared with ex erimental results. The proposed method is simple and effective for trans Pormer banks and five-limb transformers. The harmonic analysis of inrush currents is useful for protective relay design. 95100476 A compact algorlthm for tha steady-atata ?? acurlty aaaaaamant of power ayatama r;;f4.. S. et al., Electric Power Systems Res., Jul.-Aug. 1994, 30, (2), Security assessment is selected as one of the aspects of power system operations in most need of improvement and best suited to improvement through the use of emerging compact algorithm technologies. The paper examines some of the issues involved in actually making these improvements. 95100477 Contalnarlzad ?? ubatatlona ratad to 170 kV - Tha fart anawar to powar ?? upply bottlanacka Zahn, B. ABE Review, 1994, (9), 23-30. Electric utilities in many parts of the world are havin difficulty coping emg concentrated with steep rises in local demand caused by companies %* on industrial estates and in commercial centres. Containerized substations can help to solve this problem. Planned, delivered and installed in a relatively short time, they are a proven alternative to conventional outdoor and indoor substations with air- or gas-insulated switchgear. Containerized substations are also useful as stopgaps for utilities or companies modemizing their substations. Q5/00475 Currant dlatribution In A.C. multi+trand auparconductlng cables Tsuda, M. et al., Cryogenics, ICEC Supplement, 1994, 34, 555-558. In AC. multi-strand superconducting cables, AC. quench current is much less than that of D.C. This A.C. quench current degradation is caused by A.C. loss, mechanical damage by cabling! non-uniform current distribution among strands due to self and mutual inductances between strands and different electrical resistivity at the joint between superconducting strands and coooer current lead. The current distribution in non-insulated 7- and (6+1)&and cables applying A.C. transport current are calculated and the influence of contact electrical resistivity on current redistribution in uench process and in stationary state is investigated. The current redistrl‘bution characteristics of non-insulated strand cable and those of insulated strand cable are compared. s.
95100472 An archltactura for tha lntalllgant datactlon and allavlation of ovarloadad tranamlaaion line8 King, R. L. and Novosel, D. Electric Power Systems Rex, Sep. 1994, 30, (3‘ . ,.),241-249. A new control strategy is proposed that offers intelligent solutions to the problem of alleviating overloaded lines. The subsystems used consist of Hnifical neural nehvorits, a holographic associative-memory, and a knowiedge based expert system.
Daalgn for small electric machlnaa f44.95, $64.95, John Wiley & Sons Lid, Bafins Lane,
PO1 9 I LID, UK, Sept. 1994, 300 pp.
Recent developments in electrical and magnetic materials, plus the widesoread auolication of CAD uackanes have created much activitv in this aiea - 0;; of great commerdial in&rtance. This is a compreheniive text which highlights advances in design technique and in materials. The author covers various design procedures, illustrating the first specification to the prediction of performance. The inclusion of both electrical and mechanical aspects of engineering makes this book unique. It is aimed at both practising electrical, electronic, and mechanical engineers, and advanced students.
Fuel and Energy Abatracta January 1995
27