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NB/T 42107-2017: High-voltage direct current circuit-breaker
NB/T 42107-2017
NB
ENERGY INDUSTRY STANDARD
ICS 29.120.40
K 43
Filing No.. 59884-2017
High-voltage direct current circuit-breaker
高压直流断路器
ISSUED ON. AUGUST 02, 2017
IMPLEMENTED ON. DECEMBER 01, 2017
Issued by. National Energy Administration
Table of Contents
Foreword... 4
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Normal and special use conditions... 11
5 Rated value... 11
5.1 Rated DC voltage... 11
5.2 Rated current... 12
5.3 Rated short-circuit current... 12
5.4 Rated interrupting current... 12
5.5 Maximum continuous operating current... 12
5.6 Insulation level... 12
5.7 Number of mechanical operations... 13
5.8 Number of breakings of rated interrupting current... 13
5.9 Rated power consumption... 13
5.10 Rated energy absorption... 13
5.11 Rated auxiliary and control circuit power supply voltage... 14
6 Structure and performance requirements... 14
6.1 Overview... 14
6.2 General requirements... 14
6.3 Terminal mechanical load... 14
6.4 Creepage distance... 15
6.5 Auxiliary and control equipment... 15
6.6 Power operation... 15
6.7 Degree of protection of enclosure... 15
6.8 Nameplate... 15
6.9 Electromagnetic compatibility (EMC)... 16
7 Type test... 16
7.1 General... 16
7.2 Insulation test... 16
7.3 Measurement of main circuit resistance... 16
7.4 Temperature rise test... 16
7.5 Verification of degree of protection... 17
7.6 Sealing test... 17
7.7 Electromagnetic compatibility test (EMC)... 17
7.8 Mechanical operation test at ambient air temperature... 17
7.9 Terminal static load test... 17
7.10 Breaking test of DC circuit-breaker... 17
7.11 Seismic test... 19
8 Exit-factory test... 19
8.1 Overview... 19
8.2 Exit-factory test of the whole machine (when applicable)... 19
8.3 Measurement of main circuit resistance... 19
8.4 Design and appearance inspection... 19
9 Special test... 20
10 Field test... 20
11 Rules for transportation, storage, installation, operation, maintenance... 20
11.1 Overview... 20
11.2 Conditions for transportation, storage, installation... 20
11.3 Installation... 20
11.4 Operation... 20
11.5 Maintenance... 21
12 Safety... 22
13 Impact of the product on environment... 22
Appendix A (Informative) Guidelines for the selection of DC circuit-breakers... 23
Appendix B (Informative) Overload current of DC transmission system... 25
Appendix C (Informative) DC circuit-breaker test circuit and test current waveform 26
References... 30
High-voltage direct current circuit-breaker
1 Scope
This standard applies to high-voltage DC circuit-breakers (hereinafter referred to as DC
circuit-breakers) for DC 6 kV and above power systems. This standard is mainly for
mechanical DC circuit-breakers. Power electronic and hybrid DC circuit-breakers can
also refer to this standard.
This standard specifies the operating environment conditions, terms and definitions,
ratings, technical requirements, type tests, exit-factory tests, special tests, field tests, etc.
of DC circuit-breakers.
This standard also applies to the operating mechanism of DC circuit-breakers and their
auxiliary equipment.
Note. This standard covers lightning arresters, capacitors, reactors and other devices used in
DC circuit-breakers.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 1094.6-2011 Power transformers - Part 6.Reactors
GB 1984-2014 High-voltage alternating-current circuit-breakers
GB/T 2900.20-2016 Electrotechnical terminology - High-voltage switchgear and
controlgear
GB/T 11022-2011 Common specifications for high-voltage switchgear and
controlgear standards
GB/T 13498-2017 Terminology for high-voltage direct current (HVDC)
transmission
GB/T 13540 Seismic qualification for high voltage switchgear and controlgear
Note. Where there are special requirements for DC voltage, it shall be determined by
negotiation between the supplier and the buyer.
5.2 Rated current
It shall comply with the provisions of 4.5.1 of GB/T 11022-2011.
5.3 Rated short-circuit current
The DC current expected to be interrupted by the DC circuit-breaker is selected from
the following values (kA). 2, 5, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125.
Note. Where there are special requirements for current, it shall be determined by negotiation
between the supplier and the buyer.
5.4 Rated interrupting current
The DC current interrupted by the DC circuit-breaker is selected from the following
values (kA). 4, 5, 6.3, 8, 10, 12.5, 16, 20, 25, 31.5.
Note. Where there are special requirements for the current, it shall be determined by negotiation
between the supplier and the buyer.
5.5 Maximum continuous operating current
The maximum continuous operating current is generally 1.05 ~ 1.25 times the rated
current.
5.6 Insulation level
The rated insulation level of the DC circuit-breaker shall be selected from the values
given in Table 1.
5.11 Rated auxiliary and control circuit power supply voltage
Complies with the provisions of 4.9 of GB/T 11022-2011.
6 Structure and performance requirements
6.1 Overview
In DC systems, DC circuit-breakers often use several parallel branches to complete the
breaking task. Generally, DC circuit-breakers are composed of three parts.
a) Low-resistance on-state current conducting branch;
b) High-resistance current limiting and commutation branch during the breaking
process;
c) Energy absorption branch.
For the mechanical, power electronic, hybrid DC circuit-breakers described in this
standard, each has different topological structures and different technical characteristics.
The general topological structures of these three DC circuit-breakers are described in
Appendix A.
6.2 General requirements
DC circuit-breakers shall be equipped with open and closed status indicators; their
installation locations shall be clearly visible and reliable.
All components of DC circuit-breakers shall be corrosion-resistant or undergo
corrosion-resistant treatment.
6.3 Terminal mechanical load
The mechanical load of the wiring terminals in DC circuit-breakers shall not be less
than.
- Horizontal longitudinal. 2000 N;
- Horizontal transverse. 1500 N;
- Vertical. 1500 N.
Note 1.See 6.2.3 of GB/T 25309-2010.
Note 2.The wiring load under different voltage levels shall meet the requirements of actual
working conditions.
6.4 Creepage distance
It shall be in accordance with actual engineering requirements.
6.5 Auxiliary and control equipment
Comply with the provisions of 5.4 of GB/T 11022-2011 and make the following
supplement. For DC circuit-breakers using forced air cooling or water cooling, the
relevant requirements of control equipment shall be considered.
6.6 Power operation
Comply with the provisions of 5.5 of GB/T 11022-2011.
6.7 Degree of protection of enclosure
Comply with the provisions of 5.13 of GB/T 11022-2011 and make the following
supplement. The degree of protection of enclosure shall not be less than IP23.
6.8 Nameplate
The technical parameters on the nameplate shall at least include the following
parameters.
- Rated DC voltage;
- Rated current;
- Rated power consumption.
- Rated short-circuit current (optional);
- Maximum continuous operating current;
- Rated lightning impulse withstand voltage;
- Rated DC withstand voltage;
- Rated interruption current;
7.5 Verification of degree of protection
Conform to the provisions of 6.7 of GB/T 11022-2011.
7.6 Sealing test
Conform to the provisions of 6.8 of GB/T 11022-2011 (when applicable).
7.7 Electromagnetic compatibility test (EMC)
Conform to the provisions of 6.9 of GB/T 11022-2011.
7.8 Mechanical operation test at ambient air temperature
Conform to the provisions of 6.101.2 of GB 1984-2014 and make the following
supplement. Only mechanical operation test is carried out on mechanical disconnecting
device.
7.9 Terminal static load test
The terminal force shall meet the requirements of 6.3.The test shall be carried out in
accordance with the requirements of 6.101.6 of GB 1984-2014.
7.10 Breaking test of DC circuit-breaker
7.10.1 Overview
The purpose of this test is to verify whether the DC circuit-breaker has the ability to
break the specified DC short-circuit current.
This test verifies that the DC circuit-breaker can successfully interrupt the DC current
within the rated short-circuit current range, and that the interrupter can withstand the
recovery voltage between the breaks. According to the actual project requirements, the
test circuit shall be equivalent to the actual operating conditions of this type of DC
circuit-breaker.
The interruption test shall at least include the following requirements.
a) Recommended tests for products above 10 kV, see Table 2;
9 Special test
Performed in accordance with the agreement between the manufacturer and the user.
10 Field test
The purpose of the field test is to check whether the DC circuit-breaker and its auxiliary
equipment are not damaged due to transportation and storage, and to verify the overall
performance of the assembled DC circuit-breaker.
The field test includes the inspection and testing of the DC circuit-breaker components
and the DC circuit-breaker as a whole.
Each component is implemented in accordance with its own standards.
The test methods and requirements are negotiated by the supplier and the buyer.
11 Rules for transportation, storage, installation, operation,
maintenance
11.1 Overview
Comply with the provisions of Chapter 10 of GB/T 11022-2011.
11.2 Conditions for transportation, storage, installation
Comply with the provisions of 10.1 of GB/T 11022-2011.
11.3 Installation
Comply with the provisions of 10.2.1 ~ 10.2.4 of GB/T 11022-2011.
11.4 Operation
The instructions provided by the manufacturer shall include the following information.
- General description of the equipment, with particular attention to its characteristics
and technical description of operation, so that the user fully understands the main
principles involved;
- Description of the safety performance of the equipment;
- Description of the actions taken to operate, isolate, ground, maintain, test the
equipment related to operation.
11.5 Maintenance
11.5.1 Overview
The effectiveness of maintenance depends mainly on the content of the instructions
written by the manufacturer and the extent to which the user implements the instructions.
11.5.2 Recommendations for manufacturers
The manufacturer shall provide a maintenance manual that includes the following
information.
- Scope and frequency of maintenance.
- Detailed description of maintenance work;
- A complete set of drawings of switchgear and controlgear details that are critical to
maintenance, with clear markings of general assembly, subassembly, important
parts on the drawings;
- Limit values and allowable deviations; if there are deviations, make necessary
corrections;
- Specifications of auxiliary maintenance materials, including warnings for known
incompatible materials;
- List of special tools, lifting and maintenance equipment.
- Test items after maintenance;
- Recommended spare parts (description, code, quantity) and storage
recommendations;
- Estimates of effective planned maintenance time;
- At the end of the operating life of the equipment, how to deal with the equipment,
including environmental requirements.
11.5.3 Recommendations for users
If the user wishes to perform maintenance by himself, his staff shall have a detailed
understanding of the corresponding switchgear and controlgear.
Appendix A
(Informative)
Guidelines for the selection of DC circuit-breakers
A.1 Overview
This Appendix applies to DC circuit-breakers for DC transmission with voltage levels
of 6 kV and above. The recommended values of the rated parameters of DC circuit-
breakers are as shown in Chapter 5 of this standard.
In order to make the DC circuit-breaker suitable for the specified operating task, it shall
be selected according to the various rated values required by the load conditions and
fault conditions.
A.2 Selection of DC circuit-breaker ratings
A.2.1 Selection of rated DC voltage
The rated DC voltage of the DC circuit-breaker can be selected from 5.1.
A.2.2 Selection of rated current
The rated operating current of the DC circuit-breaker is determined by the rated current
of the DC project.
The rated current of the DC circuit-breaker can be selected from 5.2.
A.3 Selection of DC circuit-breaker type
The typical schemes of DC circuit-breakers are. mechanical, power electronic, hybrid.
a) Mechanical DC circuit-breakers are generally composed of breaking device (CB),
commutation capacitor (C), commutation reactor (L), commutation switch (G),
lightning arrester (MOV), as shown in the dotted box in Figure A.1;
b) Power electronic DC circuit-breakers are generally composed of power electronic
components (S) and lightning arrester (MOV), as shown in the dotted box in
Figure A.2;
c) Hybrid DC circuit-breakers are generally composed of fast mechanical
disconnector (FD), auxiliary DC switch (FS), main DC switch (MS), lightning
arrester (MOV), among which the main DC switch and auxiliary DC switch are
both power electronic components. As shown in the dotted box in Figure A.3.
DB1 and DB2 in Figures A.1, A.2, A.3 are auxiliary isolation devic...