IEEE C57.32-2015

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IEEE Standard for Requirements, Terminology, and Test Procedures for Neutral Grounding Devices

Published By	Publication Date	Number of Pages
IEEE	2015	83

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Description

Revision Standard – Active. This standard applies to devices used for the purpose of controlling the ground current or the potentials to ground of an alternating current system. These devices are: grounding transformers, ground-fault neutralizers, resistors, reactors, or combinations of these.

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PDF Pages	PDF Title
1	IEEE Std C57.32-2015 Front Cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
7	Participants
9	Introduction
10	Contents
12	Important Notice 1. Overview 1.1 Scope 1.2 General considerations
13	2. Normative references
14	3. Definitions
15	4. Grounding reactors 4.1 General description 4.2 Safety
16	4.3 Clearances: electrical, ventilation, and magnetic 4.4 Mechanical considerations
17	4.5 Concrete foundation and mounting 4.6 Service conditions 4.7 Basis for rating 4.7.1 Conditions 4.7.2 Rated current 4.7.2.1 Rated thermal current
18	4.7.2.2 Short-circuit current—asymmetrical
19	4.7.2.3 Maximum mechanical stress of neutral grounding reactors for short-circuit conditions
20	4.7.3 Rated voltage 4.7.4 Rated frequency 4.7.5 Rated time 4.8 Insulation levels 4.8.1 Insulation classes
23	4.8.2 Impulse insulation levels 4.9 Limiting temperature rises 4.9.1 Temperature limitations at rated continuous current
24	4.9.2 Temperature limitations under short-circuit conditions 4.10 Routine, design, and other tests for neutral grounding reactors
25	4.11 Dielectric tests 4.11.1 Turn-to-turn overvoltage test 4.11.2 Impulse tests 4.11.3 Power frequency withstand voltage test 4.12 Temperature rise test
26	4.13 Impedance and losses test 4.14 DC resistance test 4.15 Seismic verification 4.16 Short-circuit test
27	4.17 Nameplates 5. Ground-fault neutralizers (arc-suppression reactors) 5.1 General
28	5.2 Service conditions 5.3 Design 5.4 Bushings, insulators, and insulating liquids 5.5 Nameplates
29	5.6 Tanks and enclosures 5.7 Ratings 5.7.1 Rated voltage
30	5.7.2 Maximum continuous voltage 5.7.3 Rated thermal current 5.7.4 Rated thermal current duration 5.7.5 Rated continuous current
31	5.7.6 Adjustment range 5.7.7 Auxiliary winding 5.7.8 Secondary winding 5.7.9 Linearity of the ground fault neutralizer 5.8 Temperature limitations 5.8.1 Limits
32	5.9 Insulation levels 5.10 Temperature rise
33	5.11 Routine, design, and other tests for ground-fault neutralizers 5.12 Dielectric tests
34	5.12.1 Impulse tests 5.12.2 Applied voltage tests 5.12.3 Low-frequency withstand tests 5.13 Measurement of current at rated voltage
35	5.14 Measurement of no-load voltage of the auxiliary and secondary windings 5.15 Temperature rise test 5.16 Measurement of loss 5.17 Measurement of linearity
36	5.18 Measurement of acoustic sound level 5.19 Endurance tests of the inductance regulation mechanism 6. Grounding transformers 6.1 General description 6.2 Service conditions 6.2.1 Usual temperature and altitude service conditions
37	6.2.2 Temperature 6.2.3 Altitude 6.3 Unusual service conditions 6.3.1 Operation at altitudes in excess of 1000 m (3300 ft) 6.3.2 Insulation
38	6.3.3 Operation at rated current 6.3.4 Other unusual service conditions
39	6.4 Basis for rating 6.4.1 Conditions 6.4.2 Rated current 6.4.2.1 Rated thermal current
40	6.4.2.2 Short-circuit current—asymmetrical
41	6.4.2.3 Rated continuous neutral current 6.4.3 Rated voltage
42	6.4.4 Rated frequency 6.4.5 Rated time 6.4.6 Impedance 6.5 Insulation classes and dielectric withstand levels 6.5.1 Basic impulse insulation levels and insulation classes
43	6.5.2 Protective devices 6.6 Temperature limitations 6.6.1 Limits
44	6.6.2 Steady-state temperature rises 6.6.3 Rated-time temperature rises 6.6.3.1 Ten-second and one-minute ratings
45	6.6.3.2 Ten-minute ratings 6.6.3.3 Extended-time ratings 6.6.4 Thermal short-time capability calculations for grounding transformers
46	6.7 Tests 6.7.1 Routine, design, and other tests for grounding transformers
47	6.7.1.1 Routine tests 6.7.1.2 Design tests 6.7.1.3 Other tests 6.7.2 Test sequence
48	6.7.3 Dielectric tests
50	6.8 Construction 6.8.1 Bushings, insulators, and liquid 6.8.2 Nameplates
51	6.8.3 Tanks and enclosures 7. Grounding resistors 7.1 Resistor element 7.1.1 Conductor connections 7.2 Rated voltage
52	7.3 Temperature coefficient of resistance 7.4 Mechanical considerations 7.5 Insulation levels 7.6 Routine, design, and other tests for neutral grounding resistors
53	7.7 Temperature rise test
54	7.8 Resistance test 7.9 Dielectric tests 7.9.1 Impulse tests
55	7.9.2 Applied-voltage tests 7.9.3 Low-frequency withstand tests 7.9.4 Thermal capability calculation for neutral grounding resistors 7.9.4.1 Equations for temperature rise and current density, when current is constant
56	7.9.4.2 Equations for temperature rise and current density, when voltage is constant
57	8. Combination devices 8.1 Insulation levels 8.2 Routine, design and other tests for combination grounding devices 8.3 Dielectric tests 8.3.1 Impulse tests 8.3.2 Applied-voltage tests
58	8.3.3 Low-frequency withstand tests
59	Annex A (informative) Test code
80	Annex B (informative) Bibliography
83	Back Cover

Additional information

Standard Title	IEEE Standard for Requirements, Terminology, and Test Procedures for Neutral Grounding Devices
Published Code	IEEE
Publication Date	2015
Pages Count	83

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IEEE C57.32-2015

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