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BSI 20/30428912 DC:2020 Edition

BSI 20/30428912 DC:2020 Edition

$13.70

BS IEC 63253-5713-8. Station Service Voltage Transformers (SSVT)

Published By Publication Date Number of Pages
BSI 2020 84
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PDF Catalog

PDF Pages PDF Title
1 30428912
3 38_633e_CD
10 FOREWORD
12 Scope
Normative references
13 Terms and definitions
14 3.1 General definitions
3.1.1 Station Service Voltage Transformer
3.1.2 Enclosure
3.1.3 Primary terminal
3.1.4 Secondary terminals
3.1.5 Secondary circuit
3.1.6 Pressure relief device
3.2 Definitions related to voltage and dielectric aspects
3.2.1 Nominal system voltage
3.2.2 Highest voltage of a system / Maximum system voltage
15 3.2.3 Highest voltage for equipment / Maximum equipment voltage
3.2.4 Rated primary voltage
3.2.5 Rated secondary voltage
3.2.6 Harmonic factor
3.2.7 Rated voltage factor
3.2.8 Rated insulation level
3.2.9 Earth fault factor
3.2.10 Effectively earthed neutral system / grounded neutral system
3.2.11 Solidly earthed neutral system
16 3.3 Definitions related to windings
3.3.1 Winding
3.3.2 Primary winding
3.3.3 Secondary windings
3.3.4 Power windings
3.3.5 Metering and relaying/protection windings
3.3.6 Section
3.3.7 Tapped windings
3.4 Definitions related to ratings
3.4.1 Rating
3.4.2 Rated quantities
3.4.3 Rated frequency
3.4.4 Rated power
17 3.4.5 Rated current
3.4.6 Temperature rise
3.5 Definitions related to losses and no-load current
3.5.1 No-load loss
3.5.2 No-load current
3.5.3 Load loss
3.5.4 Total loss
3.6 Definitions related to short-circuit impedance and voltage drop
3.6.1 Short-circuit impedance
18 3.6.2 Voltage drop or rise for a specified load condition (voltage regulation)
3.7 Definitions related to gas insulation
3.7.1 Closed pressure system
3.7.2 Rated filling pressure
3.7.3 Minimum functional pressure
3.7.4 Absolute leakage rate
3.7.5 Relative leakage rate
3.8 Definitions related to other ratings
3.8.1 Rated arc proof current
19 3.9 Index of abbreviations
Service conditions
4.1 Normal (Usual) service conditions
4.1.1 General
4.1.2 Temperature
4.1.3 Altitude
4.1.4 Primary voltage
4.1.5 Load current
4.1.6 Operation above rated voltage or below rated frequency
4.1.6.1 Capability
20 4.1.6.2 Maximum continuous transformer operating voltage
4.1.6.3 Voltage Factor (Fv)
4.1.7 Outdoor operation
4.1.8 Step-down operation
4.1.9 Tank or enclosure finish
4.2 Loading beyond rated power
21 4.3 Special (Unusual) service conditions
4.3.1 Special (Unusual) temperature
4.3.2 Dielectric strength correction factor for altitudes greater than 1000 m
22 4.3.3 Other special (unusual) service conditions
23 Rating Data
5.1 Secondary voltage
5.2 Cooling classes of transformers
5.3 Frequency
5.4 Rated power
5.5 Voltage ratings and taps
5.5.1 General
5.5.2 Voltage ratings
5.5.3 Ratings of transformer taps
5.5.4 Voltage drop or rise (Voltage regulation) for a specified load condition
24 5.6 Connections
5.7 Polarity and terminal markings
5.7.1 Polarity of single-phase transformers
5.7.2 Terminal markings
5.8 Turns ratio
5.8.1 General
5.8.2 Taps
5.9 Metering winding accuracy ratings
5.9.1 General
25 5.9.2 Assignment of accuracy ratings
5.9.3 Accuracy classification for SSVT transformer with two secondary metering windings or tapped secondary windings
5.10 Short circuit impedance
5.11 Total losses
5.12 Insulation levels
26 5.13 Creepage distance requirements
27 5.14 Basic lightning impulse insulation level (BIL)
5.15 Switching impulse insulation level
5.16 Neutral terminals
5.17 An SSVT may have multiple neutral terminals, in case of tapping the primary winding at the neutral end, in order to adjust the SSVT’s voltage ratio. Insulation resistance requirements
5.18 Ground shield requirements
5.19 Dissolved gas and water content requirements for new oil-immersed SSVTs
5.20 Internal arc requirements
28 5.20.1 Internal arc protection class I
5.20.2 Internal arc protection class II
5.21 Temperature rise and loading conditions for SSVT
29 5.22 Transmitted overvoltages (TOV)
31 5.23 Nameplates
5.23.1 General
32 Construction
6.1 Tank pressure requirements for liquid-immersed SSVTs
6.2 Mechanical performance requirements
6.2.1 Sealing tests
6.2.1.1 General
6.2.1.2 Oil-immersed SSVTs
6.2.1.3 Gas-filled SSVTs
33 6.2.2 Mechanical strength of the transformer
34 6.3 Liquid insulation system
6.3.1 Insulating liquids
6.3.2 Insulating liquid preservation
6.4 Gas insulation system
6.4.1 Requirements for gases in SSVT
35 6.4.2 Pressure monitoring devices
6.4.3 Tank construction and maximum gas leakage rates
6.5 Grounding
6.5.1 Transformer grounding
36 6.5.2 Grounding of core
6.6 Degrees of protection by enclosures
6.6.1 General
6.6.2 Protection of persons against access to hazardous parts and protection of the equipment against ingress of solid foreign objects
37 6.6.3 Protection against ingress of water
6.6.3.1 General
6.6.3.2 Recommended protection level
6.6.4 Protection of equipment against mechanical impact under normal service conditions
Short-circuit characteristics
7.1 Requirements
7.1.1 General
7.1.2 Short-circuit current duration
7.1.2.1 General
38 7.1.2.2 Duration of short-circuit tests
7.1.2.3 Number of short-circuit shots
7.1.3 Short-circuit current magnitude
7.1.4 Short-circuit current calculations
7.1.4.1 Symmetrical current
7.1.4.2 Asymmetrical current
7.1.5 Temperature limits of transformers for short-circuit conditions
39 7.2 Calculation of winding temperature during a short circuit
7.3 Criteria for the short-time mechanical and thermal rating test
40 Tests
8.1 General
8.2 Dielectric tests
8.2.1.1 Dielectric tests at factory
8.2.1.2 Dielectric tests by end user
8.3 Routine, type, and special tests for transformers
42 8.3.1 General
8.3.2 Routine tests
8.3.3 Type tests
8.3.4 Special tests
43 8.4 Routine test procedures
8.4.1 Resistance measurement of windings
8.4.2 Verification of terminal markings and polarity
8.4.3 Winding insulation resistance
8.4.4 No-load losses and excitation current measurement
8.4.5 Load losses and impedance voltage measurements
44 8.4.6 Capacitance and dissipation factor requirements
45 8.4.7 Applied voltage tests
8.4.7.1 General
8.4.7.2 Applied voltage test on the neutral terminal
8.4.7.3 Applied voltage test on secondary windings
8.4.7.3.1 Applied voltage test on secondary power windings
8.4.7.3.2 Applied voltage test on secondary measuring windings
8.4.8 Induced voltage test
46 8.4.9 Partial discharge test
48 8.4.10 Routine leak test
8.4.10.1 Routine leak test for oil-immersed SSVTs
8.4.10.2 Routine leak test for gas-filled SSVTs
8.4.11 Routine accuracy performance test
8.4.11.1 Power windings
8.4.11.2 Measuring / protection windings
8.4.12 Lightning impulse tests
49 8.4.12.1 Test procedure and criteria
8.4.12.2 Chopped-wave test
50 8.4.12.3 Transformer connections for impulse test on line terminal
8.4.13 Ground shield check
8.5 Type test procedures
8.5.1 Dissolved gas and water content analysis
51 8.5.2 Mechanical test
8.5.2.1 General
8.5.2.2 Test procedure for high voltage terminals
8.5.2.3 Test procedure for low voltage terminals
52 8.5.3 Lightning impulse voltage test on the primary winding
53 8.5.4 Switching impulse voltage test in wet conditions
54 8.5.5 External radio influence voltage (RIV) test
8.5.5.1 General
8.5.5.2 RIV test performed according to CISPR 18-2
56 8.5.5.3 RIV test performed according to NEMA 107
57 8.5.5.4 Test voltages and maximum RIV voltage
8.5.6 Induced voltage test in wet conditions
58 8.5.7 Temperature rise test
8.5.7.1 General
8.5.7.2 Ambient or cooling air temperature
8.5.7.3 Temperature rise measurements
59 8.5.7.4 Determination of winding temperature at time of shutdown
8.5.7.5 Determination of average temperature by the resistance method
60 8.5.7.6 Determination of temperature rise from temperature measurements
8.5.7.7 Correction of observed temperature rise for variation in altitude
8.5.7.8 Test methods
8.5.7.8.1 Actual loading
61 8.5.7.8.2 Simulated loading
8.5.7.8.2.1 Loading back method
63 8.5.7.8.2.2 Short-circuit method
8.5.7.8.2.3 Open-circuit and short circuit method
8.6 Special test procedures
8.6.1 Endurance chopped wave test for liquid filled SSVT
8.6.1.1 General
64 8.6.1.2 Test Sequence
8.6.1.3 Requirements of the applied wave
8.6.1.4 Chopping device
8.6.1.5 SSVT connections
8.6.1.6 Measurement of voltage and current
8.6.1.7 Detection of failure
65 8.6.2 Internal arc test
8.6.2.1 Test prerequisites and documentation
8.6.2.2 Requirement of the fuse wire installation
8.6.2.3 Test conditions
67 8.6.2.4 Test Requirements
8.6.3 Low Temperature Sealing system test for gas-filled SSVTs
8.6.3.1 Evaluation Criteria
8.6.3.2 Test procedure
8.6.3.3 Test set-up
68 8.6.3.4 Test sequence
8.6.4 Seismic qualification
8.6.5 Verification of the degree of protection by enclosures
8.6.5.1 Verification of the IP coding
8.6.6 Transmitted overvoltage test
70 8.6.7 Short circuit test
8.7 Determination of thermal duplicate temperature-rise data
8.8 Frequency conversion of transformer performance parameters (50/60 Hz)
8.9 Test data
71 Tolerances
9.1 Tolerances for ratio
9.2 Tolerances for impedance
9.3 Tolerances for losses
72 9.4 Accuracies required for measuring losses
73 Bibliography
77 Annex A (informative) Dielectric tests performed at an altitude of 1000 m (3300 ft) or less for SSVTs designed for installation at altitudes greater than 1000 m (3300 ft)
78 Annex B (informative) Temperature Rise Testing Considerations
B.1 Heating and cooling curves
79 B.2 Temperature stabilization
B.3 Effect of shutting off power to take resistance measurements
B.4 Use of cooling curve to extrapolate to time of shutdown
80 B.5 Use of heating or cooling to determine thermal time constant
81 Annex C (informative) Internal arc protection for SSVT
82 Annex D (informative) Technical information exchange during contracting stage
D.1 General
D.2 System Information
D.3 Ratings
83 Annex E (Normtive) Temperature correction of load loss and impedance voltage
E.1

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BSI 20/30428912 DC
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