Standard
Track updates
AS/NZS 4777.1:2024
[Current]Grid connection of energy systems via inverters, Part 1: Installation requirements
AS/NZS 4777.1:2024 specifies safety and installation requirements for inverter energy systems (IES) intended for the injection of electric power through an electrical installation to the grid. IES are distributed energy resources when connecting to the grid and need to ensure overall safe operation of the installation and interaction with the broader grid
Published: 23/08/2024
Pages: 86
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application
1.2 Normative references
1.3 Terms and definitions
2 General requirements
2.1 General
2.2 Typical configurations
2.3 Installation and selection requirements for inverter energy systems (IES)
2.3.1 General
2.3.2 Balance
2.4 Installation requirements
2.4.1 Inverter installation
2.4.2 Equipment weatherproofing
2.4.3 Seismic protection (NZ only)
3 Connection of the IES to the electrical installation
3.1 General
3.2 Connections
3.2.1 General
3.2.2 Connection to electrical installation
3.2.2.1 General
3.2.2.2 Installations with engine driven generating sets
3.2.2.3 Connection using flexible cord
3.2.3 Connector or coupling connections to the inverters
3.3 Selection and installation of wiring systems
3.3.1 General
3.3.2 Installation method
3.3.3 Voltage rise
3.4 Control and protection
3.4.1 General
3.4.2 Overcurrent protection
3.4.3 Isolation switches
3.4.3.1 General
3.4.3.2 Isolation at the inverter
3.4.4 Residual current devices (RCDs)
3.4.5 Interface protection for IES
3.4.5.1 General
3.4.5.2 Interface protection voltage and frequency protection requirements
3.4.5.3 Interface protection equipment
3.4.5.3.1 General
3.4.5.3.2 Disconnection device
3.4.5.3.3 Instrument transformers
3.4.5.4 Connection and reconnection procedure
3.4.6 Demand response mode (DRM)
3.4.7 IES operational settings
3.4.8 Generation control of an IES
3.4.8.1 General
3.4.8.2 Independent external generation control device
3.4.8.2.1 General
3.4.8.2.2 Generation limit control
3.4.8.2.3 Export Limit control
3.5 Multiple inverter and IES installations
3.5.1 General
3.5.2 Grouped inverters with capacity no more than 5 kVA per phase (isolation requirements)
3.5.3 Inverters on the same switchboard
3.5.3.1 General
3.5.3.2 Inverters connected to switchboards without loads
3.6 Inverter power sharing device
3.6.1 General
3.6.2 Selection of IPSD
3.6.3 Installation of IPSD
3.6.3.1 General
3.6.3.2 Connection to a multiple electrical installation
3.6.4 Selection and installation of wiring systems
3.6.5 Control and protection
3.6.5.1 General
3.6.5.2 Overcurrent
3.6.5.3 Isolation switches
3.6.5.3.1 General
3.6.5.3.2 Isolation at the IPSD
3.6.5.4 IPSD interface protection
3.6.5.5 Isolation (anti-islanding)
4 Connection of energy source to an inverter
4.1 Energy sources with applicable installation standards
4.2 Electric Vehicle and electric vehicle supply equipment
4.3 Energy sources without applicable installation standards
4.3.1 General
4.3.2 d.c. maximum voltage limits
4.3.3 Connectors or coupling connections
4.3.4 Wiring systems
4.3.4.1 General requirements
4.3.4.2 Segregation of circuits
4.3.4.3 Termination of cables
4.3.5 Overcurrent protection
4.3.6 Isolation devices
4.3.7 Earth fault detection, protection and alarm
5 Multiple mode IES installation
5.1 General
5.2 Substitute Supply installations
5.2.1 General
5.2.2 Connection by fixed installation wiring
5.3 Alternative supply IES installations
5.3.1 General
5.3.2 Connection to the installation
5.3.2.1 General
5.3.2.2 Switching
5.3.3 Multiple mode inverter local Isolator
5.3.4 Multiple mode inverter supply cable rating
5.3.5 Overcurrent protection for the alternative supply
5.3.5.1 Overload protection for an alternative supply at the multiple mode inverter
5.3.5.2 Short circuit protection for alternative supply cable
5.3.6 Alternative supply switchboard
5.3.6.1 General
5.3.6.2 Alternative supply main switch
5.3.6.3 Overcurrent protection for alternative supply cable at the switchboard it is supplying
5.3.6.4 Protection requirements for final subcircuits
5.3.6.5 Supplementary supply to the alternative supply switchboard
5.4 Independent supply IES installations
5.4.1 General
5.4.2 Connection to the installation
5.4.2.1 General
5.4.2.2 a.c. input port connection
5.4.3 Independent supply inverter local isolator
5.4.4 Independent supply cable
5.4.5 Overcurrent protection for the independent supply
5.4.5.1 Overload protection for an independent supply at the independent supply inverter
5.4.5.2 Short circuit protection for independent supply cable
5.4.6 Independent supply switchboard
5.4.6.1 General
5.4.6.2 Independent supply main switch
5.4.6.3 Overcurrent protection for independent supply cable at the switchboard it is supplying
5.4.6.4 Protection requirements for final subcircuits
5.4.6.5 Supplementary supply to the independent supply switchboard
5.5 Electric Vehicles as energy source installations
5.6 Engine driven generating set connection to multiple mode inverter
5.7 Connection of portable IES
5.7.1 General
5.7.2 Connection to installation
5.7.3 Inlet plug overcurrent protection
5.7.4 Alternative supply cable
5.7.5 Alternative supply switchboard
5.7.5.1 General
5.7.5.2 Alternative supply main switch
5.7.5.3 Protection requirements for final subcircuits
6 Signs and labels
6.1 General
6.2 Signs for emergency shutdown procedure
6.3 Signs for the switchboard to which the IES is directly connected
6.4 Signs for other switchboards
6.5 Signs for inverter locations
6.6 Signs located adjacent to inverter(s)
6.7 Signs for multiple systems
6.8 Signs for multiple mode inverters
6.9 Signs for inverters with substitute supply function
6.10 Signs for portable IES inlet plug
6.11 Energy source labelling
6.11.1 Energy sources with applicable installation standards
6.11.2 Energy source labelling for electric vehicles and electric vehicle supply equipment
6.11.3 Energy sources without applicable installation standards
6.11.3.1 General
6.11.3.2 Cable identification
6.11.3.3 Signs for energy source hazard for emergency services
6.12 Additional signs for IPSD
6.12.1 Signs for IPSD system layout
6.12.2 Signs for IPSD current sensing devices
7 System documentation and commissioning
7.1 General
7.2 Manual
8 Verification
8.1 General
8.2 Visual inspection
8.3 Testing
8.3.1 General
8.3.2 Additional testing substitute supply
8.3.2.1 General
8.3.2.2 Continuity of the earthing system
8.3.2.3 Insulation resistance
8.3.2.3.1 General
8.3.2.3.2 Results
8.3.2.4 Polarity
8.3.2.4.1 General
8.3.2.4.2 Results
8.3.2.5 Verification of impedance (earth fault loop)
8.3.2.6 Operation of RCDs
8.3.3 Additional testing alternative supply
8.3.3.1 General
8.3.3.2 Confirm MEN only at the main switchboard — Grid supply mode test
8.3.3.2.1 General
8.3.3.2.2 Results
8.3.3.3 Confirm MEN only at the main switchboard — Alternative supply mode test
8.3.3.3.1 General
8.3.3.3.2 Results
8.3.3.4 Confirm continuity of neutral conductors
8.3.3.4.1 General
8.3.3.4.2 Results
8.3.4 Additional testing independent supply
8.3.4.1 General
8.3.4.2 Confirm MEN only at the main switchboard — Grid supply mode test
8.3.4.2.1 General
8.3.4.2.2 Results
8.3.4.3 Confirm MEN only at the main switchboard — Independent supply mode test
8.3.4.3.1 General
8.3.4.3.2 Results
8.3.4.4 Confirm continuity of neutral conductors
8.3.4.4.1 General
8.3.4.4.2 Results
8.3.5 Additional testing portable IES
8.4 Commissioning
8.4.1 General
8.4.2 IPSD commissioning
Appendix A
A.1 Overview
A.2 Example sign for shutdown procedure
A.3 Example signs for the switchboard to which the inverter energy system (IES) is directly connected
A.4 Example signs for other switchboards
A.5 Example sign for inverter locations
A.6 Example signs located adjacent to inverters
A.7 Example signs for multiple systems
A.8 Typical signs for multiple mode IES (Including systems with alternative supply mode)
A.9 Example energy source labelling
Appendix B
B.1 Maximum allowed voltage rise
B.2 Voltage rise calculation
B.2.1 General
B.2.2 Ampere metre per % voltage rise method
B.3 Example 1 — Single-phase overhead connection with a single-phase 5 kVA inverter system
B.3.1 Example 1 introduction
B.3.2 Consumer mains contribution to voltage rise
B.3.3 Single-phase supplementary supply cable contribution to inverter voltage rise
B.4 Example 2 — Single-phase overhead grid connection with 2 x single-phase 5 kVA inverter system with 5 kW export limit at main switchboard
B.4.1 Example 2 introduction
B.4.2 Voltage rise components
B.4.3 Consumer mains contribution to voltage rise
B.4.4 Inverter A supplementary supply cable contribution to inverter voltage rise
B.4.5 Inverter B supplementary supply cable contribution to inverter voltage rise
B.4.6 Evaluation of voltage rise for both inverters
B.5 Example 3 — Three-phase connection of 30kVA Inverter System and 5kVA Single Phase Inverter System
B.5.1 Example 3 introduction
B.5.2 Maximum inverter current
B.5.3 Voltage rise components
B.5.4 Consumer mains contribution to voltage rise with an imbalanced IES
B.5.5 IES supplementary supply cable contribution to voltage rise
B.5.6 Inverter A supplementary supply cable contribution to voltage rise
B.5.7 Inverter B supplementary supply cable contribution to voltage rise
B.5.8 2 % voltage rise requirement
B.6 Example 4 — Three-phase connection of 30 kVA inverter system and 5 kVA three-phase inverter system
B.6.1 Example 4 introduction
B.6.2 Maximum inverter current
B.6.3 Voltage rise components
B.6.4 Consumer mains contribution to voltage rise with balanced IES
B.6.5 Submains cable contribution to voltage rise
B.6.6 Inverter A supplementary supply cable contribution to voltage rise
B.6.7 Inverter B supplementary supply cable contribution to voltage rise
B.6.8 2 % voltage rise requirement
Appendix C
C.1 General
C.2 Single-phase point of supply
C.3 Multiple-phase point of supply
C.3.1 General
C.3.2 IES imbalance configurations with inverter capacity ≤ 50 kVA
C.3.3 Multiple-phase IES imbalance configurations with inverter capacity > 50 kVA
Appendix D
D.1 General
D.2 Australia
D.3 New Zealand
D.4 Integration in mini or isolated grids
Bibliography
Cited references in this standard
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