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Standards Overview
AS4777
ATRAA
October 2016
Provided by Michelle Taylor (EL42)
Summary
Updates for:
AS4777 part 1: 2016- released 30th September 2016 – application 30th March
2017
AS4777 part 2: 2015 – released 9th October 2015 – application 9th October
2016
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AS4777 part 1
• 6 months until application (apart from section 3.4.8.3 – soft limits for export
control – 18 months)
• Now up to 200kVA for installation of IES
• Considerable change with provision for multiple mode inverters, safety of
inverters (IEC62109), voltage management and smart grid enablement
• Scope – IES up to or equal to 200kVA for the injection of electric power to
an electrical installation connected to the grid at low voltage
• New terms – Demand response enabling device (DRED)
Domestic dwelling (class 1, 2 and 10 under NCC)
Multiple mode inverter – inverter that operates in more than
one mode
Voltage rise – voltage rise in an installation (specifically as
different from voltage drop) for power injection
Voltage unbalance – variation of voltage across phases
resulting from different phase currents or geometrical
asymmetry in the line
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AS4777 part 1
• No greater than 5kVA unbalance between phases
• Installations of IES in domestic residences shall have maximum d.c.
voltages of not more than 600V
• Voltage rise shall not be more than 2% across the installation
• Inverters shall not be installed as plug-in devices unless type B pluggable
device
• Requirements for central protection and inverter integrated protection (to
coordinate multiple IES at the one site) – please take note of these when
for example installing a battery system and a pv system on separate
inverters with total inverter capacity of greater than 5kVA – phase balance
protection required
• Central voltage and frequency requirements – where IES are larger than
30kVA
• RCD installations – ensure you understand the RCD requirements for your
specific inverter
• Operational settings – Demand response modes and power quality
response modes
• Export control – hard limits and soft limits
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AS4777 part 1
• Connection to energy source – cable identification
• Additional requirements – earth fault detection (62109)
• Segregation of circuits – barriers between d.c. and a.c. circuits,
identification and separation
• Installation of inverters
• Equipment weatherproofing
• Additional requirements – Multiple mode IES – inverters with a stand alone
port – MEN, labelling, separation of stand-alone supply circuits (AS3000),
RCDs
• Multiple inverter installations – less than 5kVA in total – isolation
requirements
• Many inverters – group isolators, where on a separate switchboard, have
one isolator for the whole board, clearly identify individual isolators for each
inverter
• Many inverters spread across an installation – manage voltage balance at
point of supply
• Signs
• Commissioning and documentation
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AS4777 part 2
• All inverters connected to low voltage systems
• Inverters connecting PV will meet IEC62109 parts1 and 2
• Inverters connecting energy storage (batteries) shall meet the
requirements of AS62040.1.1
• Inverters shall be fixed equipment only – permanently connected or
pluggable type B equipment
• PV inverters shall have earth fault detection and residual current detection
(either internal or external)
• Current balance for three phase inverters – measured within 5% of other
phases or used in a voltage balance mode (then able to generate
unbalanced currents)
• Demand response modes – must have DRM0, additional DR modes able
to be incorporated and now specified by AS4755
• DRM0 – Operate the disconnection device – must occur within 2 seconds
• Inverter power quality response modes – volt response modes, fixed power
factor or reactive power modes, power response modes and power rate
limits
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AS4777 part 2
• Specific multiple mode inverter operation requirements – separation from
the grid, continuity of the neutral conductor, ensure compatibility of RCDs
• MMI inverters shall have volt-watt response mode for charging of energy
storage, inverters with energy storage must also meet frequency
requirements when charging
• Operational settings (DRED and power quality response) shall be secured
against inadvertent or unauthorised tampering
• Disconnection from the grid – when grid is disrupted, when frequency and
voltage goes outside parameters and when DRM0 asserted – note this is
required for all phases if any one phase has this requirement
• Active anti-islanding shall operate within 2 seconds
• Voltage and frequency limits – response shall be within time limits – 0,2 – 2
seconds dependent on the set point reached – this cannot be altered by
installers
• New sustained operation voltage and frequency limits – 10 minute
averages – 3 second operation
• Multiple inverter combinations – testing required to operate in combinations
where multiple inverters energy systems are used
• Lots of new requirements around markings on your inverters
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