AS 60044.2-2003

1 - AS 60044.2-2003 INSTRUMENT TRANSFORMERS - SINGLE-PHASE INDUCTIVE VOLTAGE TRANSFORMERS (IEC 60044-2:1997, MOD)
4 - PREFACE
6 - CONTENTS
9 - 1 General
9 - 1.1 Scope
9 - 1.2 Normative references
10 - 2 Definitions
10 - 2. 1 General definitions
10 - 2.1.1 Instrument transformer
10 - 2.1.2 Voltage transformer
10 - 2.1.3 Unearthed voltage transformer
11 - 2.1.4 Earthed voltage transformer
11 - 2.1.5 Primary winding
11 - 2.1.6 Secondary winding
11 - 2.1.7 Secondary circuit
11 - 2.1.8 Rated primary voltage
11 - 2.1.9 Rated secondary voltage
11 - 2.1.10 Actual transformation ratio
11 - 2.1.11 Rated transformation ratio
11 - 2.1.12 Voltage error (ratio error)
11 - 2.1.13 Phase displacement
12 - 2.1.14 Accuracy class
12 - 2.1.15 Burden
12 - 2.1.16 Rated burden
12 - 2.1.17 Output
12 - 2.1.18 Highest voltage for equipment
12 - 2.1.19 Rated insulation level
12 - 2.1.20 Isolated neutral system
12 - 2.1.21 Solidly earthed neutral system
13 - 2.1.22 Impedance earthed (neutral) system
13 - 2.1.23 Resonant earthed (neutral) system
13 - 2.1.24 Earth fault factor
13 - 2.1.25 Earthed neutral system
13 - 2.1.26 Exposed installation
13 - 2.1.27 Non- exposed installation
13 - 2.1.28 Rated frequency
13 - 2.1.29 Rated voltage factor
13 - 2.1.30 Measuring voltage transformer
14 - 2.2 Additional definitions for single- phase inductive protective voltage transformers
14 - 2.2.1 Protective voltage transformer
14 - 2.2.2 Residual voltage winding
14 - 3 General requirements
14 - 4 Normal and special service conditions
14 - 4.1 Normal service conditions
14 - 4.1.1 Ambient air temperature
14 - 4.1.2 Altitude
14 - 4.1.3 Vibrations or earth tremors
14 - 4.1.4 Other service conditions for indoor voltage transformers
15 - 4.1.5 Other service conditions for outdoor voltage transformers
15 - 4.2 Special service conditions
15 - 4.2.1 Altitude
16 - 4.2.2 Ambient temperature
16 - 4.2.3 Earthquakes
16 - 4.3 System earthing
16 - 5 Ratings
16 - 5.1 Standard values of rated voltages
16 - 5.1.1 Rated primary voltages
16 - 5.1.2 Rated secondary voltages
17 - 5.2 Standard values of rated output
17 - 5.3 Standard values of rated voltage factor
18 - 5.4 Limits of temperature rise
19 - 6 Design requirements
19 - 6.1 Insulation requirements
19 - 6.1.1 Rated insulation levels for primary windings
21 - 6.1.2 Other requirements for primary winding insulation
23 - 6.1.3 Between- section insulation requirements
23 - 6.1.4 Insulation requirements for secondary windings
23 - 6.1.5 Requirements for the external insulation
23 - 6.1.6 Requirements for radio interference voltage (RIV)
23 - 6.2 Short- circuit withstand capability
24 - 6.3 Mechanical requirements
24 - 7 Classification of tests
25 - 7.1 Type tests
25 - 7.2 Routine tests
25 - 7.3 Special tests
25 - 8 Type tests
25 - 8.1 Temperature- rise test
26 - 8.2 Short- circuit withstand capability test
26 - 8.3 Impulse test on primary winding
26 - 8.3.1 General
27 - 8.3.2 Lightning impulse test
27 - 8.3.3 Switching impulse test
28 - 8.4 Wet test for outdoor type transformers
28 - 8.5 Radio interference voltage measurement
30 - 9 Routine tests
30 - 9.1 Verification of terminal markings
30 - 9.2 Power- frequency withstand tests on primary windings and partial discharge measurement
30 - 9.2.1 General
31 - 9.2.2 Windings having U
31 - 9.2.3 Windings having U
32 - 9.2.4 Partial discharge measurement
32 - 9.3 Power- frequency withstand tests between sections and on secondary windings
33 - 10 Special tests
33 - 10.1 Chopped impulse test on primary winding
33 - 10.2 Measurement of capacitance and dielectric dissipation factor
33 - 10.3 Mechanical tests
34 - 11 Markings
34 - 11.1 Rating plate markings
35 - 11.2 Terminal markings
35 - 11.2.1 General rules
35 - 11.2.2 Terminal identifiers
35 - 11.2.3 Relative polarities
35 - 12 Accuracy requirements for single-phase inductive measuring voltage transformers
35 - 12.1 Accuracy class designation for measuring voltage transformers
36 - 12.1.1 Standard accuracy classes for measuring voltage transformers
36 - 12.2 Limits of voltage error and phase displacement for measuring voltage transformers
36 - 12.3 Type tests for accuracy of measuring voltage transformers
36 - 12.4 Routine tests for accuracy of measuring voltage transformers
36 - 12.5 Marking of the rating plate of a measuring voltage transformer
37 - 13 Additional requirements for single-phase inductive protective voltage transformers
37 - 13.1 Accuracy class designation for protective voltage transformers
37 - 13.1.1 Standard accuracy classes for protective voltage transformers
37 - 13.2 Limits of voltage error and phase displacement for protective voltage transformers
37 - 13.3 Rated voltages for secondary windings intended to produce a residual voltage
38 - 13.4 Output for secondary windings intended to produce a residual voltage
38 - 13.4.1 Rated output
38 - 13.4.2 Rated thermal limiting output
38 - 13.5 Accuracy class for secondary windings intended to produce a residual voltage
38 - 13.6 Type tests for protective voltage transformers
38 - 13.6.1 Temperature- rise test for residual voltage windings
39 - 13.6.2 Tests for accuracy
39 - 13.7 Routine tests for protective voltage transformers
39 - 13.7.1 Tests for accuracy
39 - 13.8 Marking of the rating plate of a protective voltage transformer

Specifies requirements and tests for single-phase inductive voltage transformers.

This part of IEC 44 applies to new inductive voltage transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz. Although this standard relates basically to transformers with separate windings, it is also applicable, where appropriate, to auto-transformers. This standard does not apply to transformers for use in laboratories. NOTE Requirements specific to three-phase voltage transformers are not included in this standard but, so far as they are relevant, the requirements in Clauses 3 to 11 apply to these transformers and a few references to them are included in those clauses (e.g. see 2.1.4, 5.1.1, 5.2, and 11.2). Clause 13 covers the requirements and tests, in addition to those in Clauses 3 to 12, that are necessary for single-phase inductive protective voltage transformers. The requirements of Clause 13 apply particularly to transformers which are required to have sufficient accuracy to operate protective systems at voltages that occur under fault conditions.

First published as part of AS C45-1928.Second edition 1950.AS C45-1950 revised and redesignated in part as AS 1243-1972.Second edition 1982.AS 1243-1982 revised and redesignated in part as AS 60044.2-2003. First published as part of AS C45-1928. Second edition 1950. AS C45-1950 revised and redesignated in part as AS 1243-1972. Second edition 1982. AS 1243-1982 revised and redesignated in part as AS 60044.2-2003.