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IEEE 60076-21-2011

IEEE 60076-21-2011

$146.79

Power Transformers – Part 21: Standard Requirements, Terminology, and Test Code for Step-Voltage Regulators

Published By Publication Date Number of Pages
IEEE 2011 108
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– Active. Adoption of IEEE Std C57.15-2009. Description of design types, tables of 50 Hz and 60 Hz ratings, supplementary ratings, construction, and available accessories are provided. Methods for performing routine and design tests applicable to liquid-immersed single and three-phase step-voltage regulators are described. Winding resistance measurements, polarity tests, insulation power factor and resistance tests, ratio tests, no load loss and excitation current measurements, impedance and load loss measurements, dielectric tests, temperature tests, routine and design impulse tests, short-circuit tests, control tests, calculated data, and certified test data are covered.

PDF Catalog

PDF Pages PDF Title
1 IEC 60076-21:2011(E) Front cover
4 CONTENTS
6 FOREWORD
14 1. Overview
1.1 Scope
1.2 Purpose
1.3 Word usage
15 2. Normative references
16 3. Definitions
21 Figures
Figure 1 —Schematic diagram of single-phase, Type A, step-voltage regulator
Figure 2 —Schematic diagram of single-phase, Type B, step-voltage regulator
22 4. Service conditions
4.1 Usual service conditions
23 4.2 Loading at other than rated conditions
4.3 Unusual service conditions
24 Tables
Table 1 —Dielectric strength correction factors for altitudes greater than 1000 m (3300 ft)
25 4.4 Frequency
5. Rating data
5.1 Cooling classes of voltage regulators
26 5.2 Ratings
Table 2 —Limits of temperature rise
27 Table 3 —Preferred ratings for liquid-immersed 60 Hz step-voltage regulators (single phase)
28 Table 4 —Preferred ratings for liquid-immersed 50 Hz step-voltage regulators (single phase)
29 Table 5 —Preferred ratings for liquid-immersed 60 Hz step-voltage regulators (three phase)
30 5.3 Supplementary continuous-current ratings
Table 6 —Preferred ratings for liquid-immersed 50 Hz step-voltage regulators (three phase)
Table 7 —Supplementary voltage ratings for 60 Hz voltage regulators
31 5.4 Taps
5.5 Operating voltage limits
Table 8 —Supplementary continuous-current ratings for single-phase voltage regulators
Table 9 —Supplementary continuous-current ratings for three-phase voltage regulators
32 Table 10 —Typical examples of operating voltage limits including all operating voltage tolerances
33 5.6 Voltage supply ratios
5.7 Insulation levels
Table 11 —Values of voltage supply ratios
Table 12 —Interrelationships of dielectric insulation levels for voltage regulators used on systems with BIL ratings of 200 kV and below
34 5.8 Losses
35 5.9 Short-circuit requirements
Table 13 —Values of K
36 5.10 Tests
37 6. Construction
6.1 Bushings
38 6.2 Terminal markings
Figure 3 —Single-phase voltage regulators
Table 14 —Electrical characteristics of voltage regulator bushings (kV)
39 6.3 Diagram of connections
6.4 Nameplates
Figure 4 —Three-phase voltage regulators
40 6.5 Tank construction
42 Figure 5 —Support lugs B
43 Figure 6 —Support lugs C
44 6.6 Components and accessories
45 7. Other requirements
7.1 Other supplementary continuous-current ratings
7.2 Other components and accessories
Table 15 —Bushing terminal applications
Table 16 —Other supplementary continuous-current ratings for three-phase voltage regulators
46 8. Test code
47 8.1 Resistance measurements
48 Figure 7 —Connections for voltmeter-ammeter method of resistance measurement
49 8.2 Polarity test
50 8.3 Ratio tests
Figure 8 —Voltage regulator connected for polarity testing; voltage regulator in neutral position
52 Figure 9 —Voltmeter arranged to read the difference between the two output side voltages
Figure 10 —Voltmeters arranged to read the two series winding voltages
53 8.4 No-load losses and excitation current
Figure 11 —Basic circuit of ratio bridge
54 Figure 12 —Connection for no-load loss test of single-phase voltage regulator without instrument transformers
55 Figure 13 —Connections for no-load loss test of a single-phase voltage regulator with instrument transformers
57 Figure 14 —Three-phase voltage regulator connections for no-load loss and excitation current test using three-wattmeter method
58 8.5 Load losses and impedance voltage
Table 17 —Requirements for phase-angle error correction
61 Figure 15 —Single-phase voltage regulator connections for load loss and impedance voltage test without instrument transformers
Figure 16 —Single-phase voltage regulator connections for load loss and impedance voltage test with instrument transformers
62 Figure 17 —Three-phase voltage regulator connections for load loss and impedance voltage test using the three-wattmeter method
64 8.6 Dielectric tests
76 Table 18 —Measurements to be made in insulation power factor tests
77 8.7 Temperature-rise tests
79 Figure 18 —Example of loading back method: Single phase
80 Figure 19 —Example of loading back method: three phase
86 8.8 Short-circuit tests
90 8.9 Calculated data
94 9. Control systems
9.1 General
9.2 Control device construction
95 9.3 Control system requirements
96 9.4 Tests
97 Table 19 —Voltage-level values for select line-drop compensation settings
100 Annex A (informative) Unusual temperature and altitude conditions
102 Annex B (informative) Field dielectric tests
103 Annex C (informative) Bibliography
105 Annex D (informative) IEEE List of Participants

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IEEE 60076-21-2011
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