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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 2 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 3 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 4 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 5 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 6 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 7