Standard
Track updates
AS/NZS 2081:2011
[Current]Specifies the performance requirements for protection devices intended for use with electrical supply networks utilizing earth fault current limitation techniques (IT networks).
Published: 04/11/2011
Pages: 62
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope and general
1.1 Scope
1.2 Objective
1.3 Relationship to regulations
1.4 Referenced documents
1.5 Definitions
1.6 Manufacturers’ documents
1.7 Categories of tests
2 Design and construction—General requirements
2.1 Mounting
2.2 Connections
2.3 Protection against failure
2.4 Equipment for use in hazardous areas
2.5 Service conditions
2.6 Immunity to interference
2.6.1 General
2.6.2 EMI tests
2.6.2.1 General
2.6.2.2 Conducted common mode disturbances
2.6.2.3 Fast transient burst tests
2.6.2.4 Power frequency magnetic field test
2.6.2.5 Damped oscillatory magnetic field immunity test
2.6.3 Performance under test
2.7 Vibration, shock and bump immunity
2.8 IP rating
2.9 Printed circuit board surface protection
2.10 Relay contacts
2.11 Fault indication
2.12 Adjustment of relay parameters
2.13 Marking
2.13.1 Labelling of main unit
2.13.2 Labelling of ancillary components
2.14 Control power supply voltage variation
2.15 Withstand ratings of power circuit interfaces
2.15.1 General
2.15.2 Temperature withstand
2.15.3 Power frequency voltage withstand
2.15.4 Lightning impulse voltage withstand
2.15.5 Partial discharge
3 Software controlled devices
3.1 General
3.2 Security against alterations to manufacturer’s software
4 Earth fault current limiting devices
4.1 General
4.2 Compliance with standards
4.3 Manufacturing tolerance
4.4 Ratings
4.4.1 Zero sequence reactor
4.4.1.1 Earth fault current
4.4.1.2 Load current
4.4.1.3 Short circuit current
4.4.1.4 Inrush current
4.4.2 Neutral-connected (star-point to earth) impedance
4.4.2.1 Current
4.4.2.2 Time
4.4.2.3 Power factor
4.5 Withstand voltages
4.6 Specific requirements for resistor devices
4.7 Marking
4.7.1 General
4.7.2 Resistive devices
4.7.3 Reactive devices
4.7.4 Transformer devices for use in conjunction with a resistive device
4.7.5 Series connected three phase zero phase sequence reactors
5 Earth continuity protection devices
5.1 General
5.2 Operating value
5.2.1 General
5.2.2 Earth-loop series resistance value
5.2.3 Shunt resistance value
5.3 Operating time
5.4 Remote start facility
5.5 Latch/reset facility
5.6 Pilot circuit voltage withstand
5.7 Indication
5.8 Marking
6 Earth fault protection devices
6.1 General
6.2 Operating values
6.3 Operating time
6.3.1 General
6.3.2 Instantaneous trip time
6.3.3 Time delay
6.4 Current sensing transducer faults
6.5 Latch/reset facility
6.6 Withstand voltages
6.7 Indication
6.8 Marking
6.9 Protection against temperature rise associated with earth fault current
7 Earth fault lockout protection devices
7.1 General
7.2 Operating values
7.3 Sequence of tests prior to energizing circuit
7.4 Latch/reset facility
7.5 Withstand voltages
7.6 Indication
7.7 Marking
8 NER integrity protection devices
8.1 General
8.2 Operating values
8.2.1 General
8.2.2 Fault and test currents
8.2.3 Impedance values
8.2.4 Limits of impedance change
8.3 Operating time
8.4 Latch/reset facility
8.5 Withstand voltages
8.6 Indication
8.7 Marking
8.8 Effect on NER impedance value
9 Frozen contact protection devices
9.1 General
9.2 Operating values
9.2.1 Load side voltages
9.2.2 Contact states
9.3 Operating time
9.4 Latch/reset facility
9.5 Withstand voltages
9.6 Indication
9.7 Marking
10 Type tests
10.1 General
10.2 List and order of tests
10.3 Common tests
10.3.1 Electromechanical endurance test
10.3.2 EMI tests
10.3.2.1 Conducted common mode disturbances
10.3.2.2 Fast transient burst tests
10.3.2.3 Power frequency magnetic field test
10.3.2.4 Damped oscillatory magnetic field immunity test
10.3.3 Vibration tests
10.3.4 Power circuit withstand tests
10.3.4.1 General
10.3.4.2 Temperature withstand
10.3.4.3 Power frequency voltage withstand
10.3.4.4 Lightning impulse voltage withstand
10.3.4.5 Partial discharge
10.4 Earth fault current limiting devices
10.4.1 Temperature rise test
10.4.2 Variation in resistance test
10.4.3 Over-temperature rise test
10.4.4 Inrush current test
10.5 Earth continuity protection devices
10.5.1 Operating value tests—Series resistance
10.5.1.1 General
10.5.1.2 Dropout value
10.5.1.3 Pickup value
10.5.1.4 Dropout value with pilot control
10.5.1.5 Pickup value with pilot control
10.5.2 Operating value tests—Shunt resistance
10.5.3 Operating time test
10.5.3.1 Series resistance dropout time
10.5.3.2 Shunt resistance dropout time
10.5.4 Control power supply voltage variation test
10.5.4.1 Tests for correct operation at supply voltage extremes
10.5.4.2 Tests for continued operation under supply voltage collapse
10.5.5 Test of latching/reset facility
10.6 Earth fault protection devices
10.6.1 Operating value test
10.6.1.1 General
10.6.1.2 Dynamic tests
10.6.1.3 Instantaneous test
10.6.2 Operating time test
10.6.2.1 General
10.6.2.2 Instantaneous trip time
10.6.2.3 Time delay
10.6.3 Maximum heating effect test
10.6.4 Control power supply voltage variation test
10.6.4.1 Test for correct operation at supply voltage extremes
10.6.4.2 Test for continued operation under supply voltage collapse
10.6.5 Additional tests for core-balance protection devices
10.6.6 Additional tests for series-neutral protection devices
10.6.7 Test of latching/reset facility
10.6.8 Test of protection against system component faults
10.7 Earth fault lockout protection devices
10.7.1 Operating value test
10.7.2 Operating sequence test
10.7.3 Control power supply voltage variation test
10.7.3.1 Test for correct operation at supply voltage extremes
10.7.3.2 Test for continued operation under supply voltage collapse
10.7.4 Test of latching/reset facility
10.8 Ner integrity protection devices
10.8.1 Operating value test
10.8.2 Operating time test
10.8.3 Operation during earth fault
10.8.3.1 a.c. fault condition
10.8.3.2 d.c. fault condition
10.8.4 Control power supply voltage variation test
10.8.4.1 Test for correct operation at supply voltage extremes
10.8.4.2 Test for continued operation under supply voltage collapse
10.8.5 Test of latching/reset facility
10.9 Frozen contact protection devices
10.9.1 Operating value test
10.9.1.1 Test for residual a.c. voltage
10.9.1.2 Test for residual d.c. voltage
10.9.1.3 Test for logical operation
10.9.2 Operating time test
10.9.2.1 Operating for residual a.c. voltage
10.9.2.2 Operating time for residual d.c. voltage
10.9.2.3 Operating time for correct logical operation (auxiliary contact)
10.9.3 Control power supply voltage variation test
10.9.3.1 Test for correct operation at supply voltage extremes
10.9.3.2 Test for continued operation under supply voltage collapse
10.9.4 Test of latching/reset facility
11 Routine tests
11.1 Routine tests
11.1.1 General
11.1.2 Verification of operating values
11.1.3 Voltage withstand test
11.1.3.1 Power frequency voltage withstand
11.1.3.2 Partial discharge
11.2 Neutral earthing resistors
Appendix A
A1 General
A2 Voltage rating of equipment connected to an earth fault current limited circuit
A3 Auxiliary components
A4 Explosion protection
Appendix B
B1 General
B2 Voltage/duration thresholds
B3 Systems at other than 50 Hz cyclic frequency
Appendix C
C1 General
C2 Short time rated devices
C3 Component mounting
Appendix D
D1 General
D2 Auxiliary components
D3 Explosion protection
Appendix E
E1 General
E2 Auxiliary components
E3 Toroidal current transformers
E4 Test facility (refer to AS/NZS 4871)
E5 Installations in other than earth fault limited systems
Appendix F
F1 General
F2 Test facility
Appendix G
Appendix H
Appendix I
I1 General
I2 Lightning impulse withstand
I3 Partial discharge
Cited references in this standard
[Available Superseded]
Effects of current on human beings and livestock, Part 1: General aspects
[Current]
Ruling to AS/NZS 60079.14:2022 Explosive atmospheres, Part 14: Design, selection, erection and initial inspection (IEC 60079‑14:2013 (ED.5.0) MOD)
[Current]
Explosive atmospheres, Part 11: Equipment protection by intrinsic safety 'i'
AS/NZS 4871
Electrical equipment for mines and quarries (series)
[Current]
Approval and test specification - Residual current devices (current operated earth-leakage devices)
Content history
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