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Cover image for EHV AC undergrounding electrical power : performance and planning
Title:
EHV AC undergrounding electrical power : performance and planning
Personal Author:
Series:
Power systems
Publication Information:
Berlin : Springer, 2010
Physical Description:
xiv, 175 p. : ill. ; 24 cm.
ISBN:
9781848828667
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Item Category 1
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30000010321974 TK3251 B46 2010 Open Access Book Book
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Summary

Summary

"EHV AC Undergrounding Electrical Power" discusses methods of analysis for cable performance and for the behaviour of cable, mixed and overhead lines.

The authors discuss the undergrounding of electrical power and develop procedures based on the standard equations of transmission lines. They also provide technical and economical comparisons of a variety of cables and analysis methods, in order to examine the performance of AC power transmission systems. A range of topics are covered, including: energization and de-energization phenomena of transmission lines; power quality; and cable safety constraints.

"EHV AC Undergrounding Electrical Power" is a guide to cable insertion planning and the operation of power networks. It will enable readers to make performance comparisons between power transmission systems, which will be valuable for postgraduates, as well as engineers involved in power cable manufacturing or electrical transmission systems.


Author Notes

Roberto Benato was born in Venezia, Italy, in 1970. He received his Dr.-Ing. degree in Electrical Engineering from the University of Padova in 1995 and his PhD in Power Systems Analysis in 1999. In 2002 he was appointed Assistant Professor in the Power System Group in the Department of Electrical Engineering at the University of Padova. His main fields of research are multiconductor analysis, EHV-HV transmission lines and advanced matricial techniques for static and dynamic power system analysis. He is a member of CIGRÉ WG B1.08 "Cable systems in multipurpose or shared structures", secretary of CIGRÉ JWG B3-B1.09 "Application of Long High Capacity Gas Insulated Lines in Structures" and a member of the IEEE PES Substations Committee. He is also a member of IEEE and the Italian AEIT.

Antonio Paolucci was born in Padova, Italy, in 1924. He received his Dr.-Ing. degree in Electrical Engineering from the University of Padova in 1950. He joined the Department of Electrical Engineering at the University of Padova in 1952 where he was Assistant and later Associate Professor. From 1973 to 2000 he was Full Professor of Power Systems Analysis. At present, he participates in the Power System Research Group of the University of Padova and is a member of AEIT.


Table of Contents

1 HV Cable World Statistics and some Large Installationsp. 1
1.1 Introductionp. 1
1.2 Statistics of Cable Installed Lengthsp. 3
1.3 Large Installations of EHV Cable Systemsp. 7
1.4 Land and Submarine 150 kV AC Cable Link Sardinia-Corsica: SAR.COp. 7
1 5 The Madrid "Barajas" Airport Project (Spain)p. 11
1.5.1 Milestones of the Barajas Projectp. 12
1.5.2 Technical Characteristics of the Linkp. 12
1.5.3 Tunnel and Earthing System Characteristicsp. 12
1.5.4 Power EHV Cablesp. 14
1.5.5 Cable Laying in the Tunnelp. 16
1.5.6 The Transition Compounds and Protection Schemesp. 17
1.6 380 kV Double-Circuit Cable of Mixed Line Turbigo-Rho (Italy)p. 19
1.6.1 Milestones of the Turbigo-Rho Projectp. 19
1.6.2 The Undergrounding Link of the Turbigo-Rho Mixed Linep. 20
1.6.3 Power EHV Cablesp. 21
1.7 Cable Layingp. 23
1.7.1 The Transition Compounds and Protection Schemesp. 25
Referencesp. 27
2 The Positive Sequence Model of Symmetrical Linesp. 29
2.1 Introductionp. 29
2.2 The Transmission Matrix of a Uniform Linep. 29
2.3 Computation of Single-Core Cable Kilometric Parametersp. 33
2.3.1 Computation of r (Cable)p. 33
2.3.2 Computation of l (Cable)p. 34
2.3.3 Computation of c (Cable)p. 35
2.3.4 Computation of g (Cable)p. 36
2.4 Computation of GIL Kilometric Parametersp. 37
2.4.1 Computation of GIL Apparent Kilometric Resistance rp. 38
2.4.2 Computation of GIL Kilometric Inductance lp. 39
2.4.3 The Computation of GIL Kilometric Capacitance cp. 41
2.4.4 Computation of GIL Kilometric Shunt Conductance gp. 41
2.5 Some Other Matrix Relations Deriving from the Fundamental Onep. 41
2.6 Cascade Connections of Two Port Networks (TPN)p. 42
2.7 Parallel Connection of Equal Two Port Circuits Thermally and Electrically Decoupledp. 43
2.8 The Shunt Reactive Compensationp. 45
2.8.1 The Uniformly Distributed Compensationp. 45
2.8.2 The Lumped Compensationp. 46
Referencesp. 48
3 Operating Capability of Long AC EHV Power Cablesp. 49
3.1 Introductionp. 49
3.2 The Basic Constraintsp. 49
3.3 First Analysis: U 0S (¿), I R Constrainedp. 52
3.4 Second Analysis: U 0S (v), I S Constrainedp. 54
3.5 Voltages and Currents Along the Cablep. 55
3.6 Power Values Compatible with Basic Constraints and with Voltage Levels at the Receiving-Endp. 57
3.7 No-Load Energization and De-Energizationp. 60
3.8 Power Capability Chartsp. 63
3.8.1 Theoretical Limits of the Length dp. 70
3.9 Steady State Regimes Within Power Areasp. 70
3.9.1 Enhanced Capability Chartsp. 72
3.9.2 Application of Ossanna's Methodp. 75
3.10 Cables with Gas Insulation (GILs)p. 78
3.11 Regimes with U 0S = 230kVp. 80
3.12 "Receiving Area" and "Sending Area" as Set Intersectionp. 80
3.12.1 The Determination of the Receiving Area as Set Intersectionp. 81
3.12.2 The Determination of the Sending Area as Set Intersectionp. 82
3.13 The Analysis Along the Cable with Lumped Shunt Compensationp. 82
3.14 Conclusionsp. 86
Referencesp. 86
4 Operating Capability of AC EHV Mixed Lines with Overhead and Cables Linksp. 89
4.1 Introductionp. 89
4.2 Mixed Lines: OHL-UGC-OHLp. 90
4.3 The Transmission Matrices for the System Studyp. 92
4.4 First Analysisp. 92
4.5 Second Analysisp. 94
4.6 The Capability Chartsp. 96
4.6.1 Phase Voltage Levels at Rp. 99
4.7 No-Load Energization and De-Energizationp. 99
4.8 The Use of Capability Charts as a Guidep. 104
4.9 "Receiving Area" and "Sending Area" as Intersections of Setsp. 110
4.10 Analysis Completionp. 112
4.10.1 Analysis Completion by Means of Ossanna's Method and Matrix Algorithmsp. 112
4.11 Circuital Considerationsp. 113
4.11.1 The Three Matrices N H1 , N S1 , N R1p. 114
4.11.2 The Elements of N H1p. 114
4.11.3 The Matrix N S1p. 116
4.11.4 The Matrix N R1p. 116
4.11.5 The Matrices N K2 , N S2 , N R2p. 117
4.12 Conclusionsp. 118
Referencesp. 118
5 Multiconductor Analysis of UGCp. 119
5.1 Introductionp. 119
5.2 Multiconductor Cell of Three Single-Core Cables Linesp. 120
5.2.1 The Admittance Matrix Y ¿ to Model the Elementary Cellp. 122
5.2.2 Computation of Z L by Means of Simplified Carson-Clem Formulaep. 123
5.2.3 Computation of Z L by Means of Complete Carson Formulaep. 123
5.2.4 Computation of Z L After Wedepohlp. 124
5.2.5 Computation of Y T¿p. 124
5.3 Transposition Joints Modelling: Y Jp. 126
5.4 Earthing of Sheaths and Insertion of Possible Shunt Reactors: Y E ; Y E¿p. 127
5.5 The Multiconductor Supply Model at the Sending-Endp. 129
5.6 Equivalent Receiving-End Matrix for Load Modellingp. 131
5.7 The Cascade Composition of Blocks Modelled by "Admittance Partitioned Matrices": A First, Simple Circuitp. 131
5.7.1 The Introduction of Other Blocks in the First Simple Circuit and the Steady State Analysisp. 133
5.7.2 The No-Load Subtransient Energization Analysisp. 135
5.8 The Admittance Matrix Equivalent to k Blocks in Cascade Connectionsp. 135
5.9 Application of Multiconductor Analysis to the System "Cable #b, 60 km" Already Studied in Chapter 3 with Simplified Criteria (see Figures 3.21 and 3.36)p. 137
5.9.1 Comparisons with Other Methodsp. 145
5.10 Conclusionsp. 146
Referencesp. 147
6 A Comparative Procedure for AC OHL and UGC Overall Costp. 149
6.1 Introductionp. 149
6.2 OHL and UGC in the Comparative Procedurep. 150
6.3 The Capital Costs of OHL and UGCp. 154
6.4 Energy Losses and Their Actual Costp. 154
6.5 The Burden on Territoryp. 158
6.6 The Visual Impactp. 162
6.7 Operation and Maintenance (O&M) Costsp. 162
6.8 Dismantling or Decommissioning Costp. 163
6.9 The Cost of UGC Shunt Reactive Compensationp. 163
6.10 Two Case Studies: #al vs. 2#c1 with d = 10kmp. 166
6.10.1 First Case Study with Duration Curve of Figure 6.14ap. 166
6.10.2 Second Case Study with Duration Curve of Figure 6.14bp. 167
6.10.3 Sensitivity to the Principal Parametersp. 168
6.11 Case Study of Section 6.9 with Duration Curve of Figure 6.14ap. 169
6.12 Conclusionp. 170
Referencesp. 170
Indexp. 173
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