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eLibrary > BS IEC/IEEE 63253-5713-8:2024 Station Service Voltage Transformers (SSVT) >

BS IEC/IEEE 63253-5713-8:2024 Station Service Voltage Transformers (SSVT), 2024

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BS IEC/IEEE 63253-5713-8:2024 Station Service Voltage Transformers (SSVT), 2024

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CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 General definitions
3.2 Definitions related to voltage and dielectric aspects
3.3 Definitions related to windings
3.4 Definitions related to ratings
3.5 Definitions related to losses
3.6 Definitions related to gas insulation
3.7 Index of abbreviated terms
Tables [Go to Page]
Table 1 – Index of abbreviated terms
4 Profiles and use of normative references
5 Environmental conditions [Go to Page]
5.1 Normal (usual) environmental conditions [Go to Page]
5.1.1 General
5.1.2 Temperature
5.1.3 Altitude
5.1.4 Other environmental conditions
5.1.5 Primary voltage
5.1.6 Load current
5.1.7 Step-down operation
5.1.8 Operation above rated voltage or below rated frequency
5.2 Special (unusual) environmental conditions [Go to Page]
5.2.1 General
5.2.2 Special (unusual) temperature
5.2.3 Altitude correction factor for altitudes greater than 1 000 m
Table 2 – Standard values of rated voltage factor [Go to Page]
5.2.4 Loading beyond rated power
5.2.5 Other special (unusual) environmental conditions
Figures [Go to Page]
Figure 1 – Factor m for the switching impulse withstand test
6 Ratings [Go to Page]
6.1 Secondary voltage
6.2 Cooling classes of SSVTs
6.3 Frequency
6.4 Rated power
6.5 Voltage ratings and taps [Go to Page]
6.5.1 General
6.5.2 Voltage ratings
6.5.3 Ratings of SSVT taps
6.5.4 Voltage drop or rise (voltage regulation) for a specified load condition
6.6 Connections
6.7 Markings [Go to Page]
6.7.1 Polarity of single-phase SSVTs
6.7.2 Terminal markings
6.7.3 Nameplates
Table 3 – Nameplate information
6.8 Turns ratio [Go to Page]
6.8.1 General
6.8.2 Taps
6.9 Accuracy ratings of measurement windings [Go to Page]
6.9.1 General
6.9.2 Assignment of accuracy class
6.9.3 Accuracy classification for SSVT with two secondary measuring windings or tapped secondary windings
6.10 Short-circuit impedance
6.11 Total losses
6.12 Rated insulation levels of primary terminals [Go to Page]
6.12.1 Line terminal
Table 4 – Basic impulse insulation levels and power frequency withstand voltages [Go to Page]
6.12.2 Creepage distance requirements
6.12.3 Basic lightning impulse insulation level (BIL)
6.12.4 Switching impulse insulation level (BSL)
6.12.5 Neutral terminals
6.13 Rated insulation levels of secondary terminals [Go to Page]
6.13.1 Secondary power windings terminals
6.13.2 Secondary measuring windings terminals
6.14 Insulation resistance requirements
Table 5 – Creepage distances as a function of Um /3
6.15 Earth shield requirements
6.16 Dissolved gas and water content requirements for new mineral oil-immersed SSVTs
6.17 Internal arc requirements [Go to Page]
6.17.1 General
Table 6 – Dissolved gas and water content for new mineral oil-immersed SSVTs [Go to Page]
6.17.2 Internal arc protection class I
6.17.3 Internal arc protection class II
6.18 Temperature rise and loading conditions for SSVT
Table 7 – Limits of temperature rise
6.19 Partial discharge requirements
6.20 RIV requirements
7 Construction [Go to Page]
7.1 Tank pressure requirements for liquid-filled SSVTs
7.2 Mechanical performance requirements [Go to Page]
7.2.1 Overview
Table 8 – Maximum allowable 24 h average temperature of cooling air to permit SSVT to operate at rated power
Table 9 – Maximum operating temperature of power terminals intended for bolted connection in air [Go to Page]
7.2.2 Sealing requirements tests
Table 10 – Sealing test options for liquid filled SSVTs [Go to Page]
7.2.3 Mechanical strength of the SSVT
Table 11 – Static terminal loads for high voltage terminals
Table 12 – Static terminal loads for low voltage terminals
7.3 Liquid insulation system [Go to Page]
7.3.1 Insulating liquids
7.3.2 Insulating liquid preservation
7.4 Gas insulation system [Go to Page]
7.4.1 Requirements for gases in SSVTs
7.4.2 Pressure monitoring devices
7.4.3 Tank construction and maximum gas leakage rates
7.5 Earthing [Go to Page]
7.5.1 SSVT tank earthing
Figure 2 – Recommended earth pad dimensions [Go to Page]
7.5.2 Earthing of core
7.6 Degrees of protection by enclosures [Go to Page]
7.6.1 General
7.6.2 Protection of persons against access to hazardous parts and protection of the equipment against ingress of solid foreign objects
7.6.3 Protection against ingress of water
7.6.4 Protection of equipment against mechanical impact under normal environmental conditions
7.6.5 Tank or enclosure finish
8 Short-circuit characteristics [Go to Page]
8.1 Short-circuit withstand requirements [Go to Page]
8.1.1 General
8.1.2 Duration of short-circuit tests
8.1.3 Number of short-circuit shots
8.2 Short-circuit current calculations [Go to Page]
8.2.1 Symmetrical current
8.2.2 Asymmetrical current
8.3 Temperature limits of SSVTs for short-circuit conditions
8.4 Calculation of winding temperature during a short-circuit
9 Tests [Go to Page]
9.1 General
9.2 Dielectric tests [Go to Page]
9.2.1 General
9.2.2 Dielectric tests at factory
9.2.3 Dielectric tests by end user
9.3 Overview of tests for SSVTs [Go to Page]
9.3.1 General
Table 13 – Routine, type, and other tests for SSVTs [Go to Page]
9.3.2 Routine tests
9.3.3 Type tests
9.3.4 Special tests
9.4 Routine test procedures [Go to Page]
9.4.1 Resistance measurement of windings
9.4.2 Verification of terminal markings and polarity
9.4.3 Winding insulation resistance
9.4.4 Losses measurement
Figure 3 – Circuit for measuring impedance: wattmeter, voltmeter, ammeter method [Go to Page]
9.4.5 Capacitance and dissipation factor measurements
Table 14 – Test system accuracy requirements [Go to Page]
9.4.6 Applied voltage tests
9.4.7 Induced voltage test
9.4.8 Partial discharge test
Table 15 – Partial discharge test voltages [Go to Page]
9.4.9 Routine leak test
9.4.10 Routine ratio and accuracy tests
9.4.11 Lightning impulse tests
9.4.12 Earth shield check
9.5 Type test procedures [Go to Page]
9.5.1 Dissolved gas and water content analysis
9.5.2 Mechanical test
Figure 4 – Application of the test loads to the primary terminals [Go to Page]
9.5.3 Lightning impulse voltage test on the primary winding
Figure 5 – Application of the test load to the secondary terminals
Figure 6 – Example of the application of the test load to the secondary extending conductor [Go to Page]
9.5.4 Switching impulse voltage test in wet conditions
9.5.5 External radio interference voltage (RIV) test
Figure 7 – RIV measuring circuit according to CISPR 18-2
Figure 8 – RIV measuring circuit according to NEMA 107 (alternative 3-3 c) [Go to Page]
9.5.6 Induced voltage test in wet conditions
9.5.7 Temperature rise test
Table 16 – External radio interference voltage (RIV)
Figure 9 – Example of loading back method
9.6 Special test procedures [Go to Page]
9.6.1 Endurance chopped wave test for liquid filled SSVT
9.6.2 Internal arc test
Figure 10 – Internal arc fault test setup [Go to Page]
9.6.3 Low temperature sealing system test for gas-filled SSVTs
9.6.4 Seismic qualification
Table 17 – Comparable seismic levels [Go to Page]
9.6.5 Verification of the degree of protection by enclosures
9.6.6 Short-circuit withstand test
9.7 Frequency conversion of SSVT performance parameters (50/60 Hz)
9.8 Test report
Annex A (informative) Temperature rise testing considerations [Go to Page]
A.1 Heating and cooling curves
Figure A.1 – Heating curve
Table A.1 – Data from Figure A.1
A.2 Temperature stabilization
A.3 Effect of shutting off power to take resistance measurements
Figure A.2 – Cooling curve
Table A.2 – Data from Figure A.2
A.4 Use of cooling curve to extrapolate to time of shutdown
A.5 Use of heating or cooling to determine thermal time constant
Annex B (informative) Internal arc protection for SSVT
Annex C (informative) Technical information exchange during contracting stage [Go to Page]
C.1 General
C.2 System information
C.3 Environmental conditions
Table C.1 – System data
Table C.2 – Environmental conditions data
C.4 Ratings
Table C.3 – Rating data
Annex D (normative) Temperature correction of load loss and impedance voltage [Go to Page]
Table D.1 – List of symbols
Bibliography [Go to Page]

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