High voltage direct current (HVDC) power transmission - System requirements for DC-side equipment - Part 1: Using line-commutated converters

IEC TS 63014-1:2018(E) is intended to provide an overall and consistent set of guidelines to facilitate the specification of equipment for the DC-side of a high-voltage direct current (HVDC) system using line-commutated converters. For point-to-point HVDC transmission systems, this document covers all DC-side equipment located between the converter valves and the DC overhead line or cable termination, excluding the converter valves themselves. For back-to-back HVDC systems, this document covers all DC-side equipment excluding the converter valves themselves.

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Status
Published
Publication Date
07-Mar-2018
Current Stage
PPUB - Publication issued
Start Date
08-Mar-2018
Completion Date
08-Mar-2018
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IEC TS 63014-1:2018 - High voltage direct current (HVDC) power transmission - System requirements for DC-side equipment - Part 1: Using line-commutated converters
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IEC TS 63014-1
Edition 1.0 2018-03
TECHNICAL
SPECIFICATION
colour
inside
High voltage direct current (HVDC) power transmission – System requirements
for DC-side equipment
Part 1: Using line-commutated converters
IEC TS 63014-1:2018-03(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 63014-1
Edition 1.0 2018-03
TECHNICAL
SPECIFICATION
colour
inside
High voltage direct current (HVDC) power transmission – System requirements
for DC-side equipment
Part 1: Using line-commutated converters
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 29.240.01 ISBN 978-2-8322-5451-6

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 63014-1:2018 © IEC 2018
CONTENTS

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

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and Definitions .................................................................................................... 10

3.1 DC switching devices ............................................................................................ 10

3.1.1 Types of DC switching device ........................................................................ 10

3.1.2 Applications of DC switching devices ............................................................. 11

3.2 Filter components ................................................................................................. 12

3.2.1 Filter capacitors ............................................................................................. 12

3.2.2 Filter resistors ............................................................................................... 12

3.3 Surge arresters ..................................................................................................... 12

4 General ......................................................................................................................... 13

4.1 Overview............................................................................................................... 13

4.2 Environmental conditions ...................................................................................... 16

4.3 Choice of indoor versus outdoor DC yard .............................................................. 16

5 DC smoothing reactors .................................................................................................. 17

6 DC switching devices..................................................................................................... 17

6.1 High-speed DC switches ....................................................................................... 17

6.1.1 General ......................................................................................................... 17

6.1.2 Comparison of operating duties ..................................................................... 18

6.1.3 Ratings .......................................................................................................... 19

6.1.4 Tests ............................................................................................................. 23

6.1.5 Special test on current commutation capability .............................................. 30

6.2 DC disconnectors and earthing switches ............................................................... 32

6.2.1 General ......................................................................................................... 32

6.2.2 Ratings .......................................................................................................... 32

7 DC GIS .......................................................................................................................... 35

7.1 General ................................................................................................................. 35

7.2 DC GIS configuration (components of DC GIS) ..................................................... 35

8 DC filter components ..................................................................................................... 35

8.1 General ................................................................................................................. 35

8.2 Main DC filter capacitor......................................................................................... 36

8.2.1 General ......................................................................................................... 36

8.2.2 Design requirements for DC capacitors .......................................................... 36

8.2.3 Rated voltage ................................................................................................ 37

8.2.4 Base voltage for creepage calculation ........................................................... 37

8.2.5 Tests for DC capacitors ................................................................................. 38

8.3 Filter resistors ....................................................................................................... 41

8.3.1 General ......................................................................................................... 41

8.3.2 Technical data ............................................................................................... 41

8.3.3 Design aspects .............................................................................................. 43

8.3.4 Maintenance .................................................................................................. 47

8.3.5 Tests ............................................................................................................. 47

8.4 Filter reactors ....................................................................................................... 51

8.5 Auxiliary capacitors ............................................................................................... 52

8.5.1 General ......................................................................................................... 52

---------------------- Page: 4 ----------------------
IEC TS 63014-1:2018 © IEC 2018 – 3 –

8.5.2 Rated voltage of the auxiliary capacitor banks ............................................... 52

8.5.3 Base voltage for creepage calculation for auxiliary DC filter capacitors .......... 52

8.6 Series blocking filters ............................................................................................ 52

8.7 DC neutral bus capacitor ....................................................................................... 53

9 Coupling capacitors and line traps for power line carrier (PLC) ...................................... 53

10 DC surge arresters ........................................................................................................ 53

10.1 General ................................................................................................................. 53

10.2 Surge arrester specification .................................................................................. 53

10.2.1 General ......................................................................................................... 53

10.2.2 Continuous operating voltage (COV) .............................................................. 54

10.2.3 Protective characteristics ............................................................................... 54

10.2.4 Insulation withstand levels of arrester housing ............................................... 55

10.2.5 Energy dissipation capability ......................................................................... 55

10.3 Test requirements ................................................................................................. 55

11 Instrument transformers ................................................................................................. 55

11.1 DC current transformer ......................................................................................... 55

11.2 DC voltage transformer ......................................................................................... 55

11.3 Current transformers in DC filter circuits ............................................................... 55

12 DC insulators and bushings ........................................................................................... 55

12.1 Bushings ............................................................................................................... 55

12.2 Post insulators ...................................................................................................... 56

12.2.1 General ......................................................................................................... 56

12.2.2 Type tests ...................................................................................................... 56

12.2.3 Routine tests ................................................................................................. 58

12.2.4 Special tests (subject to agreement between the manufacturer and the

purchaser) ..................................................................................................... 58

12.3 Suspension insulators ........................................................................................... 58

13 Monitoring equipment for electrode line or dedicated metallic return .............................. 58

Annex A (informative) Overview of DC-side equipment ....................................................... 59

A.1 General ................................................................................................................. 59

A.2 DC smoothing reactor ........................................................................................... 60

A.3 Filter equipment .................................................................................................... 61

A.3.1 DC harmonic filters ........................................................................................ 61

A.3.2 Series DC blocking filters .............................................................................. 63

A.4 DC bushings ......................................................................................................... 64

A.5 Instrument transformers ........................................................................................ 65

A.5.1 General ......................................................................................................... 65

A.5.2 Direct voltage measurement .......................................................................... 65

A.5.3 DC current measurement ............................................................................... 66

A.6 Surge arresters ..................................................................................................... 69

A.7 Electrode line monitoring and protection equipment .............................................. 72

Annex B (informative) DC switching devices for HVDC converter stations ............................ 74

B.1 General ................................................................................................................. 74

B.2 Typical DC switching device applications .............................................................. 76

B.2.1 Metallic return transfer switch (MRTS) and earth return transfer switch

(ERTS) .......................................................................................................... 76

B.2.2 Neutral bus switch (NBS) ............................................................................... 78

B.2.3 Neutral bus earthing switch (NBES) ............................................................... 79

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– 4 – IEC TS 63014-1:2018 © IEC 2018

B.2.4 Bypass switch (BPS) ..................................................................................... 80

B.2.5 Converter paralleling switch ........................................................................... 81

B.2.6 Line paralleling switch ................................................................................... 82

B.3 Design .................................................................................................................. 83

Bibliography .......................................................................................................................... 87

Figure 1 – Scope of DC-side equipment for a back-to-back HVDC converter station

with one 12-pulse bridge per end .......................................................................................... 14

Figure 2 – Scope of DC-side equipment for a transmission HVDC converter station

with one 12-pulse bridge per pole ......................................................................................... 15

Figure 3 – Key for application of test voltages ....................................................................... 24

Figure 4 – Test circuit for commutation test .......................................................................... 31

Figure 5 – Typical arrangement of shunt DC filter ................................................................. 36

Figure 6 – Typical scheme of a resistor composed of one module ......................................... 43

Figure 7 – Transient current performance of resistor ............................................................. 51

Figure 8 – Operating voltage of a converter bus arrester (CB), rectifier operation ................. 54

Figure A.1 – Main items of DC yard equipment for a typical HVDC transmission

scheme ................................................................................................................................. 59

Figure A.2 – Some commonly used DC filter configurations .................................................. 62

Figure A.3 – Series blocking filter ......................................................................................... 64

Figure A.4 – Resistive voltage divider for measurement of direct voltage .............................. 65

Figure A.5 – Operating principle of zero-flux CT (simplified) ................................................. 67

Figure A.6 – Current measurement by resistive shunt using optical powering........................ 68

Figure A.7 – Optical current measurement ............................................................................ 68

Figure A.8 – Typical arrangement of surge arresters in a converter station with one 12-

pulse bridge per pole (only one pole shown) ......................................................................... 71

Figure A.9 – Electrode line monitoring by AC current injection .............................................. 73

Figure B.1 – Typical arrangement of DC switching devices for a bipolar transmission

scheme with one 12-pulse bridge per pole ............................................................................ 75

Figure B.2 – Typical arrangement of bypass switches and disconnectors for a bipolar

transmission scheme with two 12-pulse bridges per pole ...................................................... 76

Figure B.3 – Example arrangement of line paralleling switches for a bipolar HVDC

transmission scheme ............................................................................................................ 76

Figure B.4 – Example arrangement of converter paralleling switches for a bipolar

HVDC transmission scheme .................................................................................................. 82

Figure B.5 – Commutation switch based on the divergent current oscillation method,

without (left) and with (right) making switch .......................................................................... 84

Figure B.6 – Oscillogram of a commutation event ................................................................. 85

Figure B.7 – Commutation switch with pre-charged capacitor................................................ 86

Figure B.8 – Parallel arrangement of switches used at very high current ............................... 86

Table 1 – Summary of main parameters affecting specification of high-speed DC

switches................................................................................................................................ 19

Table 2 – Table of standard ratings in accordance with IEC 62271-100 and their

applicability to high-speed DC switches ................................................................................ 20

Table 3 – Test conditions for direct voltage test .................................................................... 25

Table 4 – Test conditions for partial discharge test ............................................................... 25

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IEC TS 63014-1:2018 © IEC 2018 – 5 –

Table 5 – Test conditions for polarity reversal test ................................................................ 26

Table 6 – Test conditions for RIV test ................................................................................... 27

Table 7 – Test conditions for lightning-impulse withstand test ............................................... 28

Table 8 – Test conditions for switching impulse withstand test .............................................. 29

Table 9 – Test conditions for power frequency withstand test ................................................ 29

Table 10 – Table of standard ratings in accordance with IEC 62271-102 and their

applicability to HVDC disconnectors and earthing switches ................................................... 32

Table 11 – Ratings for resistors ............................................................................................ 42

Table 12 – Recommended temperature and temperature rise limits for bolted and

welded connections .............................................................................................................. 46

Table B.1 – Summary of main parameters affecting specification of MRTS and ERTS .......... 78

Table B.2 – Summary of main parameters affecting specification of NBS .............................. 79

Table B.3 – Summary of main parameters affecting specification of NBES ............................ 80

Table B.4 –Summary of main parameters affecting specification of BPS ............................... 81

Table B.5 – Summary of main parameters affecting specification of CPS .............................. 82

Table B.6 – Summary of main parameters affecting specification of LPS .............................. 83

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– 6 – IEC TS 63014-1:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH VOLTAGE DIRECT CURRENT (HVDC) POWER TRANSMISSION –
SYSTEM REQUIREMENTS FOR DC-SIDE EQUIPMENT
Part 1: Using line-commutated converters
FOREWORD

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Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 63014, which is a Technical Specification, has been prepared by IEC technical

committee 115: High Voltage Direct Current (HVDC) transmission for DC voltages above

100 kV.
---------------------- Page: 8 ----------------------
IEC TS 63014-1:2018 © IEC 2018 – 7 –
The text of this Technical Specification is based on the following documents:
Enquiry draft Report on voting
115/167/DTS 115/178/RVDTS

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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

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colour printer.
---------------------- Page: 9 ----------------------
– 8 – IEC TS 63014-1:2018 © IEC 2018
HIGH VOLTAGE DIRECT CURRENT (HVDC) POWER TRANSMISSION –
SYSTEM REQUIREMENTS FOR DC-SIDE EQUIPMENT
Part 1: Using line-commutated converters
1 Scope

This Technical Specification is intended to provide an overall and consistent set of guidelines

to facilitate the specification of equipment for the DC-side of a high-voltage direct current

(HVDC) system using line-commutated converters. For point-to-point HVDC transmission

systems, this document covers all DC-side equipment located between the converter valves

and the DC overhead line or cable termination, excluding the converter valves themselves.

For back-to-back HVDC systems, this document covers all DC-side equipment excluding the

converter valves themselves. Throughout this publication, the terms 'direct voltage' and 'DC

voltage' are used interchangeably, as are 'direct current' and 'DC current'.

Traditionally, the largest items of such equipment, such as the DC smoothing reactor and DC

harmonic filters, have generally been located outdoors but increasingly the trend is to locate

such equipment indoors (although not in the valve hall itself) to provide protection from

pollution. Although product standards exist for some DC-side equipment types, many such

items of equipment have only standards written for AC applications and, in such cases, the

purpose of this document is to provide guidance as to how to specify the additional

requirements (particularly with regard to testing) for such equipment to cover their use in DC

conditions.

The converter itself is excluded from this scope, being covered by IEC 60700-1 [1] and

IEC 60700-2 [2].

Although this document includes requirements for DC disconnectors and certain types of

specialised DC switching devices (such as the Metallic Return Transfer Switch (MRTS)), it

excludes any type of DC circuit-breaker designed to interrupt fault currents.

DC-side equipment for HVDC systems based on voltage-sourced converter (VSC) technology

is excluded from this document and will be covered in a future Part 2 of IEC 63014.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

...

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