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eLibrary > PD IEC TS 62271-315:2025 High-voltage switchgear and controlgear - Direct current (DC) transfer switches >

PD IEC TS 62271-315:2025 High-voltage switchgear and controlgear - Direct current (DC) transfer switches, 2025

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PD IEC TS 62271-315:2025 High-voltage switchgear and controlgear - Direct current (DC) transfer switches, 2025

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CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 General terms and definitions
3.2 Assemblies of switchgear and controlgear
3.3 Parts of assemblies
3.4 Switching devices
3.5 Parts of switchgear and controlgear
3.6 Operational characteristics of DC transfer switches
3.7 Characteristic quantities
3.8 Index of definitions
4 Normal and special service conditions
5 Ratings [Go to Page]
5.1 General
5.2 Rated direct voltage (Urd)
5.3 Rated insulation level (Udd, Up, Us)
5.4 Rated continuous current (Ird)
5.5 Rated values of short-time withstand current [Go to Page]
5.5.1 Typical waveform of short-circuit current
5.5.2 Rated short-time withstand direct current (Ikd)
5.5.3 Rated peak withstand current (Ipd)
5.5.4 Rated duration of short circuit (tkd)
5.6 Rated supply voltage of auxiliary and control circuits (Ua) [Go to Page]
5.6.1 General
5.6.2 Rated supply voltage (Ua)
5.7 Rated supply frequency of auxiliary and control circuits
Tables [Go to Page]
Table 1 – Rated insulation levels for transfer switches
5.8 Rated pressure of compressed gas supply for controlled pressure systems
5.101 Rated direct voltage of transfer switch (Urts)
5.102 Rated transfer current (It)
5.103 Rated commutation voltage (Uc)
5.104 Rated dissipated energy during transfer operation (Erd)
5.105 Rated operating sequence
5.106 Rated open-close time
6 Design and construction [Go to Page]
6.1 Requirements for liquids in switchgear and controlgear
6.2 Requirements for gases in switchgear and controlgear
6.3 Earthing of switchgear and controlgear
6.4 Auxiliary and control equipment and circuits
6.5 Dependent power operation
6.6 Stored energy operation
6.7 Independent unlatched operation (independent manual or power operation)
6.8 Manually operated actuators
6.9 Operation of releases
6.10 Pressure/level indication
6.11 Nameplates
Table 2 – Nameplate information
6.12 Locking devices
6.13 Position indication
6.14 Degrees of protection by enclosures
6.15 Creepage distances for outdoor insulators
6.16 Gas and vacuum tightness
6.17 Tightness for liquid system
6.18 Fire hazard (flammability)
6.19 Electromagnetic compatibility (EMC)
6.20 X-ray emission
6.21 Corrosion
6.22 Filling levels for insulation, switching and operation
6.101 Seismic requirement for operation
6.102 Commutation switch [Go to Page]
6.102.1 General requirement for operation
6.102.2 Pressure limits of fluids for operation.
6.102.3 Vent outlets
6.102.4 Time quantities
6.102.5 Static mechanical loads
6.102.6 Classification
6.102.7 Arcing withstand capability
Table 3 – Classification of commutation switches and making switches
6.103 Insulated platform
6.104 Commutation capacitor
6.105 Energy dissipation device
6.106 Reactor
6.107 Making switch (if applicable)
6.108 Charging device (if applicable)
7 Type tests [Go to Page]
7.1 General [Go to Page]
7.1.1 Basics
Table 4 – Type tests [Go to Page]
7.1.2 Information for identification of test objects
7.1.3 Information to be included in type-test reports
7.2 Dielectric tests [Go to Page]
7.2.1 General
7.2.2 Ambient air conditions during tests
7.2.3 Wet test procedure
7.2.4 Arrangement of the equipment
7.2.5 Criteria to pass the test
7.2.6 Application of the test voltage and test conditions
7.2.7 Tests of switchgear and controlgear
7.2.8 Artificial pollution tests for outdoor insulators
7.2.9 Partial discharge tests
7.2.10 Dielectric tests on auxiliary and control circuits
7.2.11 Voltage test as condition check
7.3 Resistance measurement [Go to Page]
7.3.1 Measurement of the resistance of auxiliary contacts class 1 and class 2
7.3.2 Measurement of the resistance of auxiliary contacts class 3
7.3.3 Electrical continuity of earthed metallic parts test
7.3.4 Resistance measurement of contacts and connections in the main circuit as a condition check
7.4 Continuous current tests [Go to Page]
7.4.1 Condition of the test object
7.5 Short-time withstand current and peak withstand current tests [Go to Page]
7.5.1 General
7.5.2 Arrangement of the equipment and of the test circuit
7.5.3 Test current and duration
7.5.4 Conditions of the test object after test
7.6 Verification of the protection
7.7 Tightness tests
7.8 Electromagnetic compatibility tests (EMC)
7.9 Additional tests on auxiliary and control circuits
7.10 X-radiation test for vacuum interrupters
7.101 Mechanical and environmental tests [Go to Page]
7.101.1 Miscellaneous provisions for mechanical and environmental tests
7.101.2 Mechanical operation tests at ambient air temperature
Table 5 – Number of operating sequences for commutation switches [Go to Page]
7.101.3 Low and high temperature tests
Table 6 – Number of operating sequences for making switches
Figure 1 – Test sequence for low temperature test
Figures [Go to Page]
Figure 2 – Test sequence for high temperature test [Go to Page]
7.101.4 Humidity test
Figure 3 – Humidity test [Go to Page]
7.101.5 Test to prove the operation under severe ice conditions
7.102 Seismic tests
7.103 Direct current commutation tests [Go to Page]
7.103.1 General
7.103.2 Arrangement of the transfer switch during test
7.103.3 Test circuit
Figure 4 – General layout of test circuit for direct current commutation test [Go to Page]
7.103.4 Test procedure
Figure 5 – Current commutation test with low-frequency alternating current [Go to Page]
7.103.5 Behaviour of DC transfer switch during test
7.103.6 Criteria to pass the test
7.104 Direct arc withstand tests [Go to Page]
7.104.1 General
7.104.2 Arrangement of the transfer switch during test
7.104.3 Test circuit
Figure 6 – General layout of test circuit for direct arc withstand test [Go to Page]
7.104.4 Test procedure
7.104.5 Behaviour of DC transfer switch during test
7.104.6 Criteria to pass the test
8 Routine tests [Go to Page]
8.1 General
8.2 Dielectric test on the main circuit
8.3 Tests on auxiliary and control circuits
8.4 Measurement of the resistance of the main circuit
8.5 Tightness test
8.6 Design and visual checks
8.101 Mechanical operating tests
9 Guide to the selection of DC transfer switches （informative） [Go to Page]
9.1 General
9.2 Selection of rated values [Go to Page]
9.2.101 General
9.2.102 Selection of rated direct voltage of transfer switch and rated insulation level
9.2.103 Selection of rated operating sequence
9.2.104 Selection of rated continuous current
9.2.105 Selection of rated values of short time withstand current
9.2.106 Selection of rated transfer current
9.2.107 Selection of rated commutation voltage
9.3 Cable-interface considerations
9.4 Continuous or temporary overload due to changed service conditions
9.5 Environmental aspects
9.101 Selection of the application [Go to Page]
9.101.1 MRTS
9.101.2 ERTS
9.101.3 NBS
Figure 7 – Equivalent transfer circuit of MRTS and ERTS [Go to Page]
9.101.4 NBES
Figure 8 – Equivalent transfer circuit of NBS
10 Information to be given with enquiries, tenders and orders (informative) [Go to Page]
10.1 General
10.2 Information with enquiries and orders
Figure 9 – Equivalent transfer circuit of NBES
10.3 Information with tenders
11 Transport, storage, installation, operating instructions and maintenance
12 Safety
13 Influence of the product on the environment
Annexes [Go to Page]
Annex A (normative) Test requirements for components of DC transfer switches [Go to Page]
A.1 Commutation switch
A.2 Making switch
A.3 Commutation capacitor
A.4 Energy dissipation device
A.5 Reactor
A.6 Charging device [Go to Page]
A.6.1 Type tests for charging device
A.6.2 Routine test for charging device
Annex B (informative) Additional information about test circuit and measured signals for DC transfer switches having an oscillation branch [Go to Page]
B.1 Test circuits for direct current transfer test
Figure B.1 – Test circuit with measuring points
Figure B.2 – Measured signals during test (overview) [Go to Page]
B.2 Test circuits for direct arc withstand test
Figure B.3 – Measured signals during test (expanded in time)
Figure B.4 – Test circuit of direct arc withstand tests
Table B.1 – Legend of measuring points
Annex C (normative) Tolerances on test quantities during tests
Table C.1 – Tolerances on test quantities for type test
Annex D (normative) Records and reports of type tests [Go to Page]
D.1 Information and results to be recorded
D.2 Information to be included in type test reports [Go to Page]
D.2.1 General
D.2.2 Apparatus tested
D.2.3 Rated characteristics of DC transfer switch, including its operating devices and auxiliary equipment
D.2.4 Test conditions (for each series of tests)
D.2.5 Direct current commutation tests
D.2.6 Direct arc withstand tests
D.2.7 Short-time withstand current test
D.2.8 No-load operation
D.2.9 Oscillographic and other records
Annex E (informative) Extension of validity of type tests [Go to Page]
E.1 General
E.2 Dielectric tests
E.3 Continuous current test
E.4 Electromagnetic immunity test on auxiliary and control circuits
E.5 Environmental tests on auxiliary and control circuits
E.6 DC transfer current test
Bibliography [Go to Page]

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