UHV AC transmission systems - Part 102: General system design

IEC TS 63042-102:2021(E) specifies the procedure to plan and design UHV transmission projects and the items to be considered.
The objective of UHV AC power system planning and design is to achieve both economic efficiency and high reliability, considering its impact on EHV systems.

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Status
Published
Publication Date
23-Aug-2021
Current Stage
PPUB - Publication issued
Completion Date
24-Aug-2021
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IEC TS 63042-102:2021 - UHV AC transmission systems - Part 102: General system design
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IEC TS 63042-102
Edition 1.0 2021-08
TECHNICAL
SPECIFICATION
colour
inside
UHV AC transmission systems –
Part 102: General system design
IEC TS 63042-102:2021-08(en)
---------------------- Page: 1 ----------------------
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IEC TS 63042-102
Edition 1.0 2021-08
TECHNICAL
SPECIFICATION
colour
inside
UHV AC transmission systems –
Part 102: General system design
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.01; 29.240.10 ISBN 978-2-8322-1012-7

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 63042-102:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions ...................................................................................................... 9

4 Objective and key issues of UHV AC transmission application ......................................... 9

4.1 Objective ................................................................................................................ 9

4.2 Key application issues .......................................................................................... 10

5 Required studies on UHV AC system planning and design ............................................. 10

5.1 General ................................................................................................................. 10

5.2 Required studies ................................................................................................... 11

5.3 Required analysis tools ......................................................................................... 11

6 UHV AC system planning ............................................................................................... 13

6.1 General ................................................................................................................. 13

6.1.1 Introductory remarks ...................................................................................... 13

6.1.2 Transmission capacity considering routes and line types to use ..................... 13

6.1.3 Reactive power management issues .............................................................. 13

6.1.4 Environmental issues ..................................................................................... 14

6.2 Scenario for system planning ................................................................................ 15

6.3 Scenario for network planning procedure .............................................................. 15

6.3.1 Power transmission capacity .......................................................................... 15

6.3.2 System voltage .............................................................................................. 16

6.3.3 Route selection .............................................................................................. 16

6.3.4 Series compensation ..................................................................................... 17

6.4 Required parameters ............................................................................................ 17

6.5 Transmission network (topology) ........................................................................... 17

6.6 Reliability .............................................................................................................. 18

7 UHV AC system design.................................................................................................. 19

7.1 General ................................................................................................................. 19

7.2 Reactive power management ................................................................................ 19

7.3 Reclosing schemes ............................................................................................... 19

7.4 Delayed current zero phenomenon ........................................................................ 21

7.5 Protection and control system ............................................................................... 22

7.6 Insulation design (cost effectiveness) ................................................................... 22

Annex A (informative) History of development of UHV AC transmission technologies ........... 24

A.1 General ................................................................................................................. 24

A.2 History of development in the USA ........................................................................ 24

A.3 History of development in former USSR and Russia .............................................. 24

A.4 History of development in Italy .............................................................................. 24

A.5 History of development in Japan ........................................................................... 25

A.6 History of development in China ........................................................................... 25

A.7 History of development in India ............................................................................. 25

Annex B (informative) Experiences relating to UHV AC transmission development............... 26

B.1 Project development in Italy .................................................................................. 26

B.1.1 Background (including network development) ................................................ 26

B.1.2 Demand analysis and scenario of application................................................. 26

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IEC TS 63042-102:2021 © IEC 2021 – 3 –

B.1.3 Project overview ............................................................................................ 26

B.1.4 UHV system planning .................................................................................... 27

B.1.5 UHV system design ....................................................................................... 28

B.1.6 Laboratory and field tests .............................................................................. 29

B.2 Project development in China ............................................................................... 32

B.2.1 Background ................................................................................................... 32

B.2.2 Project overview ............................................................................................ 32

B.2.3 Changzhi-Nanyang-Jingmen UHV AC extension project ................................. 33

B.2.4 Overvoltage mitigation and insulation coordination ........................................ 35

B.2.5 Insulation coordination ................................................................................... 36

B.2.6 Laboratory and field tests .............................................................................. 38

B.3 Project development in India ................................................................................. 40

B.3.1 Background (including network development) ................................................ 40

B.3.2 Demand analysis and scenario of application................................................. 40

B.3.3 Project overview ............................................................................................ 40

B.3.4 Development of 1 200 kV national test station in India ................................... 41

B.3.5 POWERGRID's 1 200 kV transmission system ............................................... 42

B.3.6 UHV AC technology design – Insulation coordination ..................................... 43

B.3.7 Insulation design for substation ..................................................................... 44

B.4 Project development in Japan ............................................................................... 45

B.4.1 Background (including network development) ................................................ 45

B.4.2 Demand analysis and scenario of application................................................. 46

B.4.3 Project overview ............................................................................................ 46

B.4.4 UHV system planning .................................................................................... 47

B.4.5 UHV system design ....................................................................................... 47

B.4.6 Laboratory and field tests .............................................................................. 50

Annex C (informative) Summary of system technologies specific to UHV AC

transmission systems .................................................................................................... 53

C.1 Technologies used in China .................................................................................. 53

C.1.1 Transformer ................................................................................................... 53

C.1.2 UHV shunt reactor and reactive compensation at tertiary side of

transformer .................................................................................................... 54

C.1.3 Switchgear .................................................................................................... 55

C.1.4 Series capacitor (SC) .................................................................................... 57

C.1.5 Gas-insulated transmission line (GIL) ............................................................ 59

C.2 Technologies used in India ................................................................................... 60

C.2.1 UHV AC transformer ...................................................................................... 60

C.2.2 Surge arrester ............................................................................................... 61

C.2.3 Circuit-breakers ............................................................................................. 62

C.2.4 Instrument transformers ................................................................................. 63

C.3 Technologies used in Japan .................................................................................. 64

C.3.1 Switch gear ................................................................................................... 64

C.3.2 Surge arrester ............................................................................................... 65

Bibliography .......................................................................................................................... 67

Figure 1 – Analysis tool by time domain ................................................................................ 12

Figure 2 – Flowchart of reactive power compensation configuration ...................................... 14

Figure 3 – π equivalent circuit ............................................................................................... 15

Figure 4 – Four-legged reactor ............................................................................................. 20

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– 4 – IEC TS 63042-102:2021 © IEC 2021

Figure 5 – One typical reclosing sequence of high speed earthing switches (HSESs) ........... 21

Figure 6 – Procedure for insulation design ............................................................................ 23

Figure B.1 – Demand situation in Italy................................................................................... 26

Figure B.2 – UHV transmission lines in Italy as originally planned in '70 ............................... 27

Figure B.3 – SPIRA system and SICRE system .................................................................... 28

Figure B.4 – Preliminary system design ................................................................................ 29

Figure B.5 – Field testing of UHV equipment ......................................................................... 30

Figure B.6 – UHV AC transmission projects implemented in China........................................ 32

Figure B.7 – Single-line diagram of Changzhi-Nanyang-Jingmen UHV AC pilot project ......... 33

Figure B.8 – Artificial grounding test of UHV series capacitors in China ................................ 34

Figure B.9 – Single-line diagram of Huainan-Zhebei-Shanghai double-circuit UHV AC

project .................................................................................................................................. 34

Figure B.10 – Generator integrated into a UHV system through a UHV step-up

transformer ........................................................................................................................... 35

Figure B.11 –Hubei Wuhan UHV AC test base ...................................................................... 38

Figure B.12 –Hebei Bazhou UHV tower test base ................................................................. 38

Figure B.13 – 1 200 kV national test station (India) ............................................................... 41

Figure B.14 – Power flow from Satna to Bina diverted via a 1 200 kV test station (India) ...... 42

Figure B.15 – Schematic of 1 200 kV UHV AC line ................................................................ 43

Figure B.16 – Typical V-I characteristic of 1 200 kV MOSA ................................................... 44

Figure B.17 – Sequence of events for calculation of surge arrester energy

accumulation ........................................................................................................................ 45

Figure B.18 – Trend of peak demand in Japan ...................................................................... 46

Figure B.19 – UHV transmission line for each construction year in Japan ............................. 47

Figure B.20 – Concept for transmission capacity enhancement with short-circuit

current restriction .................................................................................................................. 47

Figure B.21 – Insulation design sequence of 1 100 kV transmission lines' air gap

clearances ............................................................................................................................ 48

Figure B.22 – UHV designed transmission line in TEPCO ..................................................... 49

Figure B.23 – Field testing of UHV substation equipment since 1996 .................................... 50

Figure C.1 – UHV AC transformer ......................................................................................... 53

Figure C.2 – UHV AC shunt reactor ...................................................................................... 54

Figure C.3 – Reactor and capacitor at tertiary side of UHV transformer ................................ 55

Figure C.4 – UHV GIS ........................................................................................................... 56

Figure C.5 – UHV MTS ......................................................................................................... 56

Figure C.6 – UHV air insulated disconnectors ....................................................................... 57

Figure C.7 – Single-line diagram of UHV series capacitor ..................................................... 58

Figure C.8 – UHV series capacitor ........................................................................................ 58

Figure C.9 – UHV GIL tunnel below Yangtze River ................................................................ 59

Figure C.10 – Inside a UHV GIL tunnel during assembly ....................................................... 59

Figure C.11 – 333 MVA transformer for the 1 200 kV test station .......................................... 61

Figure C.12 – First prototype of 850 kV surge arrester for 1 200 kV system .......................... 62

Figure C.13 – UHV circuit-breaker in India ............................................................................ 63

Figure C.14 – Instrument transformer ................................................................................... 64

Figure C.15 – 1 100 kV gas circuit-breaker ........................................................................... 65

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IEC TS 63042-102:2021 © IEC 2021 – 5 –

Figure C.16 – Resistor-assisted disconnecting operation ...................................................... 65

Figure C.17 – Surge arrester with low protection level .......................................................... 66

Table 1 – Specification of reclosing scheme.......................................................................... 21

Table B.1 – Specifications of 1 100 kV transformer .............................................................. 30

Table B.2 – Specifications of pilot plant (substation) ............................................................. 31

Table B.3 – Specifications of pilot plant (cable) ..................................................................... 31

Table B.4 – Parameters of substation and switching station of Changzhi-Nanyang-

Jingmen UHV AC pilot project ............................................................................................... 33

Table B.5 – Parameters of transmission lines of Changzhi-Nanyang-Jingmen UHV AC

pilot project ........................................................................................................................... 33

Table B.6 – Main system parameters of UHV AC projects in China ....................................... 35

Table B.7 – Main system parameters of UHV arrester ........................................................... 36

Table B.8 – Required minimum value of clearance of the 1 100 kV transmission line ........... 37

Table B.9 – Minimum clearance of UHV substation (metres) ................................................. 37

Table B.10 – Overvoltage withstand level of UHV AC projects in China ................................. 38

Table B.11 – Basic technical parameters for 1 200 kV UHV AC system selected in

India ..................................................................................................................................... 43

Table B.12 – TOV and energy absorption by surge arrester .................................................. 45

Table B.13 – Requirement against large charging MVA ......................................................... 49

Table B.14 – Specifications of substation insulation design ................................................... 49

Table B.15 – Specifications of 1 100 kV transformer ............................................................. 50

Table B.16 – Specifications of 1 100 kV GIS ......................................................................... 51

Table B.17 – Example of field test – Measurement items of transformer ............................... 51

Table B.18 – Example of field test – Measurement items of GIS ........................................... 52

Table C.1 – Main parameters of UHV AC typical transformer ................................................ 53

Table C.2 – Main parameters of UHV AC reactive power compensation equipment ............... 54

Table C.3 – Main parameters of UHV AC circuit-breaker ....................................................... 55

Table C.4 – Rated values of UHV SCs in Changzhi-Nanyang-Jingmen UHV extension

project .................................................................................................................................. 58

Table C.5 – Specifications of 333 MVA transformer for the 1 200 kV test station ................... 60

Table C.6 – Technical specifications of surge arrester .......................................................... 61

Table C.7 – Technical parameters of UHV circuit-breaker .................................................... 62

Table C.8 – Parameters of instrument transformer ................................................................ 63

Table C.9 – Specifications of gas circuit-breaker .................................................................. 65

Table C.10 – Specifications of surge arrester ........................................................................ 66

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– 6 – IEC TS 63042-102:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UHV AC TRANSMISSION SYSTEMS –
Part 102: General system design
FOREWORD

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IEC TS 63042-102 has been prepared by IEC technical committee 122: UHV AC transmission

systems. It is a Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
122/109/DTS 122/114/RVDTS

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.

The language used for the development of this Technical Specification is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.
---------------------- Page: 8 ----------------------
IEC TS 63042-102:2021 © IEC 2021 – 7 –

A list of all parts in the IEC 63042 series, published under the general title UHV AC transmission

systems, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it

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– 8 – IEC TS 63042-102:2021 © IEC 2021
INTRODUCTION

Large capacity power sources including large-scale renewable energy have recently been

developed, but they are generally located far away from load centres. To meet the requirements

for large capacity power transmission, some countries have introduced, or are considering

introducing, ultra high voltage (UHV) transmission systems, overlaying these on the existing

extra high voltage (EHV) systems.

The objective of UHV AC power system planning and design is to achieve both economic

efficiency and high reliability, considering its impact on EHV systems.

Moreover, UHV AC transmission systems require comparatively large spaces, and the method

of minimizing and optimizing the size and structure of UHV AC transmission lines and substation

apparatus is another important issue.
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IEC TS 63042-102:2021 © IEC 2021 – 9 –
UHV AC TRANSMISSION SYSTEMS –
Part 102: General system design
1 Scope

This part of IEC 63042 specifies the procedure to plan and design UHV transmission projects

and the items to be considered.
2 Normative references
There are no normative references in this document.
...

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