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BSI PD IEC/TS 60076-23:2018

BSI PD IEC/TS 60076-23:2018

$167.15

Power transformers – DC magnetic bias suppression devices

Published By Publication Date Number of Pages
BSI 2018 34
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This document specifies requirements for devices for the suppression of DC magnetic bias of power transformers and convertor transformers. It includes requirements for service conditions, structures, testing, packing, transport and storage.

The devices are connected to neutral points of power transformers and converter transformers to suppress DC bias current in the case an HVDC system is operated in monopole ground return mode or bipolar unbalanced mode. In the case of dedicated metallic return HVDC system, the devices are useful to mitigate DC stray current flowing through power transformers and converter transformers during transient conditions such as DC line fault.

This document applies to DC magnetic bias suppression devices for operation at frequencies of 50 Hz and 60 Hz on power systems having voltages above 110 kV.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms and definitions
11 4 Service conditions
4.1 General
12 4.2 Seismic conditions
4.3 Unusual conditions
5 Selection principle
5.1 Classification and features of the devices
5.2 Selection principle for DC current-limiting devices
13 5.3 Selection principle for the DC current- blocking device
5.4 Calculation and verification
6 DC current-limiting device
6.1 Functional requirements
6.1.1 General
6.1.2 Resistance
14 6.1.3 Overvoltage protection
6.1.4 Structure
6.2 Ability to withstand effects of short-circuit current
6.2.1 Ability to withstand thermal effects of short-circuit current
6.2.2 Ability to withstand dynamic effects of short-circuit current
15 6.3 Temperature rise
6.3.1 Metal chip resistors
6.3.2 Dry-type non-inductive epoxy-resin insulated resistors
6.3.3 Other types of resistors
6.4 Insulation level
7 DC current-blocking device
7.1 Functional requirements
7.1.1 General
7.1.2 Capacitance
16 7.1.3 Bypass switches
7.1.4 Function of device
7.1.5 Structure
17 7.2 Ability to withstand effects of short-circuit current
7.2.1 Ability to withstand thermal effects of short-circuit current
7.2.2 Ability to withstand dynamic effects of short-circuit current
7.3 Temperature rise
7.4 Insulation level
8 Tests
8.1 Test classification
Tables
Table 1 – Test items
18 8.2 Routine tests
8.2.1 General
8.2.2 Visual inspection
8.2.3 DC resistance measurement
8.2.4 Capacitance measurement
8.2.5 Insulation resistance measurement
8.2.6 Withstand voltage test
Table 2 – Rated insulation level (kV)
19 8.2.7 Gap discharge test
8.2.8 Function check of DC current- blocking devices
8.3 Type tests
8.3.1 General
8.3.2 Temperature rise test of DC current-limiting device
20 8.3.3 Thermal stability test
8.3.4 Dynamic stability test
8.3.5 Lightning impulse test
8.3.6 Ingress protection test
9 Packing, transportation and storage requirements
10 Nameplate specification
21 11 Technical documentation requirements
22 Annex A (informative) Generation mechanism of DC bias current of power transformers caused by HVDC system
Figures
Figure A.1 – Schematic diagram of DC flowing path in the monopoleground return mode
Figure A.2 – Resistance network and ground electric field distribution
23 Annex B (informative) Examples of harmful effects of DC bias current
Figure B.1 –Mechanism of DC bias
24 Table B.1 – Test results of DC bias influence on DC system
25 Figure B.2 – Damage to transformer
Table B.2 – Vibration data of transformer (mm/s)
26 Annex C (informative) DC current-limiting device
Figure C.1 – Electrical schematic diagram ofDC current-limiting device
27 Annex D (informative) DC current-blocking device
Figure D.1 – Electrical schematic diagram of DCcurrent-blocking device
28 Annex E (informative) Information needed to calculate the DC bias current of transformers
E.1 General
E.2 Information of grounding electrode of HVDC system
E.3 Parameters of equipment in substations and converter stations
E.4 Parameters of power transmission lines
29 Annex F (informative) Methods of calculation of DC bias current
F.1 Method based on modelling of underground electric field
Table F.1 – The resistivity and thickness of layered soil
30 F.2 Method based on calculation model of resistor network with equivalent voltage sources
Figure F.1 – Schematic diagram of modelling for DC bias current calculation
Figure F.2 – Ground potential around the grounding electrode of HVDC system
31 Figure F.3 – Schematic diagram for calculation of DC bias current basedon the equivalent voltage source
32 Annex G (informative) Application examples
Table G.1 – Test data of DC current, noise and vibration
33 Table G.2 – Test data

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BSI PD IEC/TS 60076-23:2018
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