IEC TS 62344:2013

IEC/TS 62344 ®
Edition 1.0 2013-01
TECHNICAL
SPECIFICATION
colour
inside
Design of earth electrode stations for high-voltage direct current (HVDC) links –
General guidelines
IEC/TS 62344:2013(E)
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IEC/TS 62344 ®
Edition 1.0 2013-01
TECHNICAL
SPECIFICATION
colour
inside
Design of earth electrode stations for high-voltage direct current (HVDC) links –

General guidelines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XC
ICS 29.240.99 ISBN 978-2-83220-575-4

– 2 – TS 62344 © IEC:2013(E)
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 10
3.22 current-releasing density . 13
4 System conditions . 14
4.1 General principles . 14
4.2 System parameters related to earth electrode design . 14
4.2.1 Amplitude and duration of the current . 14
4.2.2 Polarity . 14
4.2.3 Designed lifespan . 15
4.2.4 Common earth electrodes . 15
5 Design of land electrode stations . 15
5.1 Main technical parameters . 15
5.1.1 General principles . 15
5.1.2 Temperature rise . 16
5.1.3 Earthing resistance . 16
5.1.4 Step voltage . 17
5.1.5 Touch voltage . 17
5.1.6 Current density . 17
5.1.7 Field intensity in fish ponds . 18
5.2 Electrode site selection and parameter measurement . 18
5.2.1 General principles . 18
5.2.2 Data collection survey . 18
5.2.3 Distance from converter station (substation) . 18
5.2.4 Environment conditions . 19
5.2.5 Terrain and landform . 19
5.2.6 Measurement of soil parameters . 19
5.2.7 Geological exploration . 19
5.2.8 Topographical map . 19
5.2.9 Values selected during design . 19
5.3 Earth electrode and associated components . 20
5.3.1 General principles for material selection . 20
5.3.2 Selection of feeding rods and characteristics . 20
5.3.3 Chemical and physical properties of petroleum coke . 21
5.3.4 Current-guiding system . 21
5.3.5 Bus . 22
5.3.6 Electrode line monitoring device . 22
5.4 Electrode arrangement . 22
5.4.1 General principles . 22
5.4.2 Filling coke . 22
5.4.3 Selection of earth electrode shape. 22
5.4.4 Earth electrode corridor (right of way) . 23
5.4.5 Distance between sub-electrodes in the arrangement . 23
5.4.6 Burial depth of the earth electrodes . 23

TS 62344 © IEC:2013(E) – 3 –
5.4.7 Segmentation of earth electrodes . 24
5.5 Minimum size of earth electrode . 24
5.5.1 General principles . 24
5.5.2 Total earth electrode length . 24
5.5.3 Side length of coke section . 24
5.5.4 Diameter of feeding rods . 25
5.6 Current guiding system . 26
5.6.1 General principles . 26
5.6.2 Placement of the current-guiding wire . 26
5.6.3 Connection of current-guiding wire . 26
5.6.4 Selection of current-guiding wire cross-section . 27
5.6.5 Insulation of the current-guiding wire . 27
5.6.6 Disconnecting switch . 27
5.6.7 Connection of the feeding cable. 27
5.6.8 Connection of jumper cables . 28
5.6.9 Selection of cable structure . 28
5.6.10 Selection of cable cross-section . 28
5.6.11 Selection of cable insulation . 28
5.6.12 Cable welding position . 29
5.6.13 Welding . 29
5.6.14 Mechanical protection for cable . 29
5.7 Auxiliary facilities . 29
5.7.1 Online monitoring . 29
5.7.2 Soil treatment . 29
5.7.3 Exhaust equipment . 30
5.7.4 Fence . 30
5.7.5 Marker . 30
6 Design of sea electrode station and shore electrode station . 30
6.1 Main technical parameters . 30
6.1.1 Temperature rise . 30
6.1.2 Earthing resistance . 30
6.1.3 Step voltage . 31
6.1.4 Touch voltage . 32
6.1.5 Voltage gradient in water . 32
6.1.6 Current density . 32
6.2 Electrode site selection and parameter measurement . 32
6.2.1 General principles . 32
6.2.2 Data collection survey . 32
6.2.3 Distance from converter station (substation) . 32
6.2.4 Environment conditions . 33
6.2.5 Measurement of soil parameters . 33
6.3 Earth electrode and associated components . 33
6.3.1 General principles for material selection . 33
6.3.2 Common feeding rods and characteristics . 33
6.3.3 Chemical properties of petroleum coke . 34
6.3.4 Current-guiding system . 34
6.3.5 Bus . 34
6.3.6 Electrode line monitoring device . 34
6.4 Electrode arrangement . 34

– 4 – TS 62344 © IEC:2013(E)
6.4.1 General principles . 34
6.4.2 Filling coke . 34
6.4.3 Selection of earth electrode shape. 34
6.4.4 Segmentation of earth electrodes . 35
6.5 Current-guiding system . 35
6.5.1 Placement of the current-guiding wire . 35
6.5.2 Connection of current-guiding system . 35
6.5.3 Selection of cable cross-section .
...