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IEEE Standard for Requirements, Terminology, and Test Procedures for Neutral Grounding Devices, 2015
- IEEE Std C57.32-2015 Front Cover
- Title page
- Important Notices and Disclaimers Concerning IEEE Standards Documents
- Participants
- Introduction
- Contents
- Important Notice
- 1. Overview [Go to Page]
- 1.1 Scope
- 1.2 General considerations
- 2. Normative references
- 3. Definitions
- 4. Grounding reactors [Go to Page]
- 4.1 General description
- 4.2 Safety
- 4.3 Clearances: electrical, ventilation, and magnetic
- 4.4 Mechanical considerations
- 4.5 Concrete foundation and mounting
- 4.6 Service conditions
- 4.7 Basis for rating [Go to Page]
- 4.7.1 Conditions
- 4.7.2 Rated current [Go to Page]
- 4.7.2.1 Rated thermal current
- 4.7.2.2 Short-circuit current—asymmetrical
- 4.7.2.3 Maximum mechanical stress of neutral grounding reactors for short-circuit conditions
- 4.7.3 Rated voltage
- 4.7.4 Rated frequency
- 4.7.5 Rated time
- 4.8 Insulation levels [Go to Page]
- 4.8.1 Insulation classes
- 4.8.2 Impulse insulation levels
- 4.9 Limiting temperature rises [Go to Page]
- 4.9.1 Temperature limitations at rated continuous current
- 4.9.2 Temperature limitations under short-circuit conditions
- 4.10 Routine, design, and other tests for neutral grounding reactors
- 4.11 Dielectric tests [Go to Page]
- 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
- 4.13 Impedance and losses test
- 4.14 DC resistance test
- 4.15 Seismic verification
- 4.16 Short-circuit test
- 4.17 Nameplates
- 5. Ground-fault neutralizers (arc-suppression reactors) [Go to Page]
- 5.1 General
- 5.2 Service conditions
- 5.3 Design
- 5.4 Bushings, insulators, and insulating liquids
- 5.5 Nameplates
- 5.6 Tanks and enclosures
- 5.7 Ratings [Go to Page]
- 5.7.1 Rated voltage
- 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
- 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 [Go to Page]
- 5.8.1 Limits
- 5.9 Insulation levels
- 5.10 Temperature rise
- 5.11 Routine, design, and other tests for ground-fault neutralizers
- 5.12 Dielectric tests [Go to Page]
- 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
- 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
- 5.18 Measurement of acoustic sound level
- 5.19 Endurance tests of the inductance regulation mechanism
- 6. Grounding transformers [Go to Page]
- 6.1 General description
- 6.2 Service conditions [Go to Page]
- 6.2.1 Usual temperature and altitude service conditions
- 6.2.2 Temperature
- 6.2.3 Altitude
- 6.3 Unusual service conditions [Go to Page]
- 6.3.1 Operation at altitudes in excess of 1000 m (3300 ft)
- 6.3.2 Insulation
- 6.3.3 Operation at rated current
- 6.3.4 Other unusual service conditions
- 6.4 Basis for rating [Go to Page]
- 6.4.1 Conditions
- 6.4.2 Rated current [Go to Page]
- 6.4.2.1 Rated thermal current
- 6.4.2.2 Short-circuit current—asymmetrical
- 6.4.2.3 Rated continuous neutral current
- 6.4.3 Rated voltage
- 6.4.4 Rated frequency
- 6.4.5 Rated time
- 6.4.6 Impedance
- 6.5 Insulation classes and dielectric withstand levels [Go to Page]
- 6.5.1 Basic impulse insulation levels and insulation classes
- 6.5.2 Protective devices
- 6.6 Temperature limitations [Go to Page]
- 6.6.1 Limits
- 6.6.2 Steady-state temperature rises
- 6.6.3 Rated-time temperature rises [Go to Page]
- 6.6.3.1 Ten-second and one-minute ratings
- 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
- 6.7 Tests [Go to Page]
- 6.7.1 Routine, design, and other tests for grounding transformers [Go to Page]
- 6.7.1.1 Routine tests
- 6.7.1.2 Design tests
- 6.7.1.3 Other tests
- 6.7.2 Test sequence
- 6.7.3 Dielectric tests
- 6.8 Construction [Go to Page]
- 6.8.1 Bushings, insulators, and liquid
- 6.8.2 Nameplates
- 6.8.3 Tanks and enclosures
- 7. Grounding resistors [Go to Page]
- 7.1 Resistor element [Go to Page]
- 7.1.1 Conductor connections
- 7.2 Rated voltage
- 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
- 7.7 Temperature rise test
- 7.8 Resistance test
- 7.9 Dielectric tests [Go to Page]
- 7.9.1 Impulse tests
- 7.9.2 Applied-voltage tests
- 7.9.3 Low-frequency withstand tests
- 7.9.4 Thermal capability calculation for neutral grounding resistors [Go to Page]
- 7.9.4.1 Equations for temperature rise and current density, when current is constant
- 7.9.4.2 Equations for temperature rise and current density, when voltage is constant
- 8. Combination devices [Go to Page]
- 8.1 Insulation levels
- 8.2 Routine, design and other tests for combination grounding devices
- 8.3 Dielectric tests [Go to Page]
- 8.3.1 Impulse tests
- 8.3.2 Applied-voltage tests
- 8.3.3 Low-frequency withstand tests
- Annex A (informative) Test code
- Annex B (informative) Bibliography
- Back Cover [Go to Page]