AS 4777.3-2002

1 - AS 4777.3-2002 GRID CONNECTION OF ENERGY SYSTEMS VIA INVERTERS - GRID PROTECTION REQUIREMENTS
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 APPLICATION
6 - 3 NORMATIVE REFERENCES
7 - 4 DEFINITIONS
7 - 4.1 Active anti-islanding protection
7 - 4.2 Electricity distribution network
7 - 4.3 Grid
7 - 4.4 Inverter
7 - 4.5 Inverter energy system
7 - 4.6 Islanding
7 - 4.7 Nominal grid voltage
7 - 4.8 Passive anti-islanding protection
7 - 4.9 Electro-mechanical switch
8 - 4.10 Uninterruptible power supply (UPS) system
8 - 5 GENERAL AND SAFETY REQUIREMENTS
8 - 5.1 Electrical safety
8 - 5.2 Connection to low-voltage distribution network
8 - 5.3 EMC
8 - 5.4 Voltage flicker
8 - 5.5 Impulse protection
8 - 5.6 Data logging and communications devices
8 - 6 GRID PROTECTION REQUIREMENTS
8 - 6.1 General
9 - 6.2 Disconnection device
9 - 6.3 Voltage and frequency limits (passive anti-islanding protection)
9 - 6.4 Limits for sustained operation
9 - 6.5 Active anti-islanding protection
10 - 6.6 Reconnection procedure
10 - 6.7 Security of protection settings
10 - 6.8 Compliance with grid protection requirements
11 - APPENDIX A - LIMITS FOR SUSTAINED OPERATION
12 - APPENDIX B - GRID PROTECTION DEVICE TESTS
12 - B1 GENERAL
12 - B2 UNDER- AND OVER-VOLTAGE TRIP SETTINGS AND RECONNECTION TEST
12 - B2.1 Tests
13 - B2.2 Criteria for acceptance
13 - B3 UNDER- AND OVER-FREQUENCY TRIP SETTINGS AND RECONNECTION TEST
13 - B3.1 Tests
14 - B3.2 Criteria for acceptance
14 - B4 GRID TRIP TEST
14 - B4.1 General
16 - B4.2 Grid trip test under load condition (a)
16 - B4.3 Grid trip test under load condition (b)
17 - B4.4 Grid trip test under load condition (c)

Specifies grid protection requirements for inverter energy systems with ratings up to 10 kVA for single-phase units, or 30 kVA for three-phase units, and intended for connection to the low-voltage electricity distribution network (grid).

This Standard specifies the requirements for grid protection devices intended to be used in inverter energy systems, with ratings up to 10 kVA for single-phase units, or up to 30 kVA for three-phase units, and for the injection of electric power through an electrical installation to the electricity distribution network.NOTES: 1 Although this Standard does not apply to larger systems, similar principles can be used for the grid protection of such systems.2 These devices do not replace devices used for protection and/or isolation as required in AS/NZS 3000.

First published as AS 4777.3-2002.