Large Embedded Generation User Guide A

Large Embedded Generation User Guide A For Generating Systems AS4777 compliant and up to 200kW January 2013 SA Power Networks www.sapowernetworks.com.au

Table of Contents 1. Introduction... 3 1.1 Embedded generator s obligation to advise... 3 1.2 Available information on connecting embedded generation to our Network... 3 1.3 Structure of this User Guide... 4 1.4 Interpretation... 4 1.5 Revisions... 4 2. Obligation for Negotiated Connection and Supply Contract... 5 3. The Connection Process... 5 4. Technical Issues for Consideration... 7 4.1 Export embedded generation... 7 4.2 Single phase embedded generation... 8 4.3 Low voltage embedded generation... 8 5. Code compliance... 8 6. Operating protocols and procedures... 9 7. Commissioning and testing of embedded generation plant... 9 8. Compliance monitoring and maintenance... 10 9. Notice of alteration to approved design... 10 10. Metering installation... 10 11. Fees and charges... 11 12. Further Information... 13 13. Referenced documents... 15 Appendix A: Definitions and terms... 16 Appendix B: Detailed Description of the Connection Application Process... 18 Appendix C: SA Power Networks Technical Requirements... 19 Appendix D: Information Required for an Application for a Connection Service... 21 REVISION A JANUARY 2013 Page 2 of 22

1. Introduction This User Guide has been prepared by SA Power Networks to ensure that customers have a robust process to follow for connecting to SA Power Networks distribution network large embedded generation that is compliant with AS4777 and has a nameplate capacity less than 200kW. Embedded generation is defined as Generating Systems connecting directly to the distribution network and not having direct access to the transmission network. This is intended as a guide only and does not constitute a detailed description of SA Power Networks or your obligations under the Essential Services Commission of South Australia s (ESCOSA) Electricity Distribution Code (EDC) and the National Electricity Rules (NER). It is the responsibility of the Proponent to ensure that they are compliant with the NER and the EDC. Due to the unique nature of each proposed project, this User Guide does not include information on the SA Power Networks response timeframes or charges applicable to your proposed project. SA Power Networks response timeframes and charges for your proposed project will be supplied on receipt of your enquiry. 1.1 Embedded generator s obligation to advise Any customer proposing to connect a large embedded generation installation to the SA Power Networks distribution network must advise SA Power Networks. Negotiations with SA Power Networks for the possible connection of an embedded generating unit must precede any detailed design, placement of orders for equipment and letting of contracts to avoid costs to the Proponent arising from designs or equipment identified by SA Power Networks to be unsuitable for connection to the distribution network. SA Power Networks must undertake all necessary investigations to confirm that the proposed connection of an embedded generating unit to the distribution network will not have any adverse impact on the safety and security of the network. 1.2 Available information on connecting embedded generation to our Network In order to accommodate the diverse range of Generating Systems that seek connection to our Network, SA Power Networks have three separate connection processes. The type of Generating Units as well as the nameplate capacity of the entire Generating System will determine which process will be applicable to your embedded generation project. You can find a description of the process for connecting to our Network in the following locations: Generating Systems AS4777 compliant and with a nameplate capacity up to 10kW single phase and 30kW three phase Refer to the Small Embedded Generation Technical Guidelines Large Generating Systems AS4777 compliant and with a nameplate capacity up to 200kW Refer to this User Guide All other Generating Systems Refer to the Large Embedded Generation User Guide B for Generating Systems non AS4777 compliant or greater than 200kW REVISION A JANUARY 2013 Page 3 of 22

1.3 Structure of this User Guide This User Guide explains the standard connection process for large embedded generation installations that are compliant with AS4777 and have a nameplate capacity less than 200kW. This User Guide also provides guidance on SA Power Networks technical requirements for the connection of such Generating Systems. Specifically, this User Guide aims to: Provide assistance to the Proponent in regards to connecting embedded generation to the distribution network; Outline the technical requirements for an Embedded Generator installation in accordance with the applicable Codes, Australian Standards, SA Power Networks Service and Installation Rules, and SA Power Networks embedded generating unit connection requirements; and Provide assistance to identify the Proponent s responsibilities in regards to embedded generating unit(s) connection and interface requirements to the distribution network; 1.4 Interpretation In this User Guide the words shall and must indicate mandatory requirements. This User Guide seeks to provide definitions consistent with those given in the Electricity Act, ESCOSA Electricity Distribution Code and the National Electricity Rules. 1.5 Revisions SA Power Networks may amend and expand this User Guide from time to time where it may be necessary to meet the requirements of the applicable regulations and to suit the needs of the distribution network. SA Power Networks Large Embedded Generation User Guide A for Generating Systems AS4777 compliant and up to 200kW will be identified by a revision number and issue date. REVISION A JANUARY 2013 Page 4 of 22

2. Obligation for Negotiated Connection and Supply Contract SA Power Networks, in accordance with the applicable regulations must not connect an embedded generating unit to the distribution network unless it has entered into a Negotiated Connection and Supply Contract with the Embedded Generator. Therefore the Proponent of any large embedded generation installation must enter into a Negotiated Connection and Supply Contract with SA Power Networks in accordance with the National Electricity Rules. The Negotiated Connection and Supply Contract is subject to commercial negotiations between the parties and will encompass both the technical and commercial aspects of the connection, address the access standards and minimum technical requirements and specify the terms and conditions including the connection charge, service charges and quality of supply in accordance with the applicable regulations. The contract also requires the Embedded Generator to indemnify SA Power Networks against any liability resulting from the Embedded Generator s use of the distribution network in a manner prejudicial to the safety and efficiency of the network. 3. The Connection Process SA Power Networks has established procedures in line with the National Electricity Rules to process applications to connect from embedded generating system Proponents. For Generating Systems that are compliant with AS4777 and have a nameplate capacity less than 200kW, a simplified connection process flow diagram is provided in Figure 1. A detailed description of our connection application process up to and including the provision of our Offer to Connect is included as Appendix B. The description of our connection process contained within this User Guide is intended as a guide only and does not constitute a detailed description of your obligations under the NER. SA Power Networks response timeframes will be in accordance with the requirements of the NER. Our response timeframes and charges for your proposed project will be supplied by us on receipt of your enquiry. REVISION A JANUARY 2013 Page 5 of 22

SA Power Networks Customer SA Power Networks provide response in line with NER, consisting of: Charges for assessment (non-refundable) Our requirements (refer Appendix C of this User Guide) Information we require from you (refer Appendix D of this User Guide Your enquiry Proceed or Close Project Close End Proceed SA Power Networks undertake an impact assessment Submit all required information SA Power Networks prepares a formal Offer, consisting of: Construction Offer (our charges) Construction Terms Negotiated Connection & Supply Contract Proceed or Close Project Close End Proceed Return signed Terms and Conditions SA Power Networks issue approval number to allow meter change SA Power Networks construct your Connection Service (if required) In parallel You install your Generating System (no connection to Network allowed) SA Power Networks witness your testing Generating System connected to Network REVISION A JANUARY 2013 You submit your commissioning report End Figure 1: Simplified connection process for Generating Systems that are compliant with AS4777 and have a nameplate capacity less than 200kW

4. Technical Issues for Consideration Any proposed embedded Generating System that is capable of being operated in parallel with the distribution network must be assessed to confirm that Generating System will meet SA Power Networks requirements and will not impact on the quality of supply to SA Power Networks other Network Users. The embedded generating unit must comply with all applicable SA Power Networks User Guides, Australian Standards, Codes and Regulations. A detailed description of the technical requirements that must be complied with are included as Appendix C of this User Guide. SA Power Networks requirements ensure the safety, security and reliability of our Network and include: Generating System Protection; Quality of Supply to SA Power Networks other Network users, including Network Stability; Network Infrastructure Thermal Capacity; Network Voltage Control; Generating System Reactive Capability; Voltage Fluctuations; Harmonics; and Voltage Balance. Generating System Control; and Generating System Metering. Prior to the connection of an embedded generating unit to the distribution network, SA Power Networks must undertake a detailed analysis of the network. SA Power Networks detailed analysis will identify any network operating constraints, network reinforcement requirements due to increases in network capacity, levels of reactive VAr support and network voltage compensation control for the proposed connection. SA Power Networks is entitled under the NER to recover our costs for undertaking investigations in response to generation connection enquiries and processing an Application for a Connection Service. 4.1 Export embedded generation An export embedded generating unit is an embedded generating unit designed to export electricity to the distribution network. An export embedded generator unit must have an agreement with a Retailer to purchase the export electricity generated by the embedded generating unit. All embedded generating units with a nameplate capacity greater than 100kVA must be licensed by ESCOSA as a Generator. Most export embedded generating units that are compliant with AS4777 and have a nameplate capacity less than 200kW shall not require communication links installed between SA Power Networks and the embedded generating unit installation to provide SCADA monitoring and control. The exact requirement will be determined during SA Power Networks assessment of the proposed embedded generator connection to the distribution network. The nameplate capacity and operational requirements of the proposed embedded generating system in relation to the capacity of the distribution network at the proposed connection point will influence the actual interface and communications requirements. REVISION A JANUARY 2013 Page 7 of 22

In the event that remote monitoring and control is required for the Generating System, the requirements of Appendix C of SA Power Networks Large Embedded Generation User Guide B for Generating Systems non AS4777 compliant or greater than 200kW will apply. 4.2 Single phase embedded generation SA Power Networks does not permit the connection to either the low voltage (LV) or high voltage (HV) distribution networks of single phase embedded generating unit installations unless the unit(s) comply with AS 4777. 4.3 Low voltage embedded generation Unless otherwise agreed by SA Power Networks, connection of three phase generating unit(s) with SA Power Networks shared LV distribution network is not permitted (i.e. where more than one customer is connected to the HV transformer via SA Power Networks LV distribution network). 5. Code compliance The general installation must comply with all relevant Australian Standards, including but not limited to AS 3000, AS 3008, AS 3017, AS 1931, AS 60038, AS/NZS 61000, AS 4777 and AS/NZS 5033 (if applicable). All other relevant government and statutory requirements must be adhered to, such as the Technical Regulations under the Electricity Act 1996 and the OHS&W Regulations 1995. The Generator and installation must comply with the following Standards, Codes, Regulations and User Guides: National Electricity Rules (NER), as applicable; Essential Services Commission of South Australia (ESCOSA) Electricity Distribution Code; SA Power Networks Service & Installation Rules; and SA Power Networks User Guides, as applicable to the Generating System type and nameplate capacity. REVISION A JANUARY 2013 Page 8 of 22

6. Operating protocols and procedures Most export embedded generating units that are compliant with AS4777 and have a nameplate capacity less than 200kW shall not be required to develop operating protocols and procedures in conjunction with SA Power Networks. The exact requirement for operating protocols and procedures will be determined during SA Power Networks assessment of the proposed embedded generator connection to the distribution network, taking into account the nameplate capacity and operational requirements of the proposed embedded generating system in relation to the capacity of the distribution network at the proposed connection point. Any operating procedures and protocols that are required to be developed by the Embedded Generator must be in accordance with Section 6 of SA Power Networks Large Embedded Generation User Guide B for Generating Systems non AS4777 compliant or greater than 200kW. 7. Commissioning and testing of embedded generation plant Prior to the connection of the embedded generating unit to the distribution network, SA Power Networks is entitled to inspect and, where necessary, require the Embedded Generator to test those parts of the embedded generation installation that have a direct effect on the network. This is to enable SA Power Networks to verify that the embedded generation installation is acceptable for connection and complies in all respects with SA Power Networks requirements. The commissioning shall include demonstration of the protection and quality of supply to ensure that the installation complies with the EDC. The commissioning requirements include: A commissioning program detailing the method of testing the above needs to be submitted prior to SA Power Networks witnessing the commissioning; The provision of logging data in a format suitable to be opened and viewed by SA Power Networks; A brief summary report must be included detailing the results of the commissioning tests; and It is recommended that the data loggers are installed to measure the existing conditions as a bench mark prior to connecting the solar PV embedded Generating System to the Network. The compliance testing that is required to verify compliance with the requirements defined in this User Guide, in particular the Quality of Supply aspects, must be assessed and verified by a suitably accredited, independent third party acceptable to SA Power Networks, with the requisite skills and competencies. Alternatively, the Embedded Generator may elect to have this work carried out by SA Power Networks for a commercially negotiated fee. REVISION A JANUARY 2013 Page 9 of 22

8. Compliance monitoring and maintenance The Embedded Generator must develop a compliance monitoring program, including an agreed method by which the Embedded Generator can demonstrate ongoing compliance of the embedded generation installation with the applicable regulations and the embedded generating units continued operation in accordance with good engineering practice and the applicable regulations. The Embedded Generator must provide to SA Power Networks a copy of the agreed and duly authorised compliance-monitoring program. In respect of the ongoing operation of the embedded generating unit, the Embedded Generator must maintain the protection and control systems of the embedded generation installation and any other service provided by the Embedded Generator in connection with the embedded generation installation that impacts on the generating unit, its safety or operation, or the safety or operation of the distribution network. 9. Notice of alteration to approved design The Embedded Generator must not significantly alter the approved design of the embedded generation installation without the prior written consent of SA Power Networks. The approved design is the design of the plant as covered by the network studies and / or included within the Network Connection Contract. If at any time the Embedded Generator wishes to propose an increase in the agreed nameplate capacity of the embedded generation installation, the Embedded Generator must request the increase in writing to SA Power Networks. Upon receipt of the written request, SA Power Networks will advise the Embedded Generator if it is necessary for SA Power Networks to undertake a new network analysis (at the Embedded Generator s cost) in order to ascertain the operational constraints of the embedded generation installation with the proposed changes to the installation. 10. Metering installation Revenue metering must be installed in compliance with the EDC and the NER for all embedded generation with export capacity (i.e. import / export meters). The operational requirements of the generating unit and National Grid Metering must be addressed, with the role of Responsible Person / Metering Provider / Meter Data Agent to be decided by the Embedded Generator. The import / export meter must include additional functionality to record quality of supply data that SA Power Networks can access for long term monitoring of the installation. The Customer must provide written permission for SA Power Networks to access this information for monitoring purposes. SA Power Networks will offer to undertake the roles of Metering Provider and Responsible Person in accordance with the EDC and the NER on a Fee for Service basis. REVISION A JANUARY 2013 Page 10 of 22

11. Fees and charges Fees and charges applicable to the installation of large-embedded generators that are compliant with AS4777 and have a nameplate capacity less than 200kW are: Offer Preparation Fee based on an Application for a Connection Service; This is a once off cost to cover all reasonable costs incurred by SA Power Networks in undertaking the assessment of the proposal for the connection of the embedded generating unit to the distribution network and includes: network studies; connection design and estimates; preparation of the draft Negotiated Connection and Supply Contract; and preparation of Offer to Connect. Connection Charge; This is a once off cost to cover all reasonable costs incurred by SA Power Networks in undertaking the scope of works as identified within the Negotiated Connection and Supply Contract to connect a large embedded generating unit to the distribution network and includes: provision, installation and commissioning of the embedded generator connection assets; and network augmentation to facilitate the embedded generating unit s connection Connection Service & Management Fee; A Connection Service & Management Fee will not apply to most export embedded generating units that are compliant with AS4777 and have a nameplate capacity less than 200kW. Any such fee will be determined during SA Power Networks assessment of the proposed embedded generator connection to the distribution network. This is an annual fee to cover all reasonable costs incurred by SA Power Networks in undertaking the following: Provision of 24 hour, 7 day monitoring and control services for the embedded generating unit s access to the distribution network. Use of SA Power Networks SCADA system infrastructure, equipment / software / licences (software and communications) for the provision of the services to enable the embedded generating unit s access to the distribution network. Routine maintenance and repairs of the connection assets including substation equipment specifically installed for the embedded generator access to the network (i.e. circuit breaker / recloser, protection equipment including inter-trip / radio communications equipment / telemetry interface relays / SCADA RTU interface); Maintenance planning / coordination with the Embedded Generator; Compliance monitoring of interface protection in accordance with the applicable regulations; and Negotiated Connection and Supply Contract Management (periodic review of the contract to cover changes in industry practice in compliance with the NER and Distribution Codes). REVISION A JANUARY 2013 Page 11 of 22

Metering Provider Fee (where applicable); This is an annual fee to cover all reasonable costs incurred by SA Power Networks in providing the Embedded Generator revenue metering and is based on the SA Power Networks standard fees and charges for the provision and maintenance of the class of metering required for the proposed generator connection in accordance with the National Electricity Rules and / or the Electricity Distribution Code as applicable. Responsible Person Fee (where applicable). This is an annual fee to cover all reasonable costs incurred by SA Power Networks in undertaking the role of Responsible Person in relation to the National Electricity Market revenue Metering installation in accordance with the provisions of the National Electricity Rules. REVISION A JANUARY 2013 Page 12 of 22

12. Further Information Further information and assistance on connecting a proposed large embedded generation installation can be obtained from our Customer Solutions Managers: John Aplin Country North Telephone: (08) 8682 0567 Mario Pepicelli Elizabeth Telephone: (08) 8282 1545 James Case Adelaide Telephone: (08) 8404 5407 Geoff Wegener Mount Barker Telephone: (08) 8532 8883 Malcolm Farmer St Marys Telephone: (08) 8275 0902 John Riedel South East Telephone: (08) 8724 1617 The responsible Customer Solutions Manager for your proposed project can be determined from the Geographical Areas of Responsibility map provided in Figure 2. REVISION A JANUARY 2013 Page 13 of 22

Figure 2: SA Power Networks Customer Solutions Managers Geographical Areas of Responsibility REVISION A JANUARY 2013 Page 14 of 22

13. Referenced documents The following Australian Standards are referred to in these User Guides: AS 1931 Part 1 High voltage - Test techniques - General definition and test requirements AS 60038 Standard voltages ; AS/NZS 61000.3.6: Electromagnetic compatibility (EMC) - Limits - Assessment of emission limits for distorting loads in MV and HV power systems ; AS/NZS 61000.3.7: Electromagnetic compatibility (EMC) - Limits - Assessment of emission limits for fluctuating loads in MV and HV power systems ; AS 4777 Grid connection of energy systems via inverters AS/NZS 5033 Installation of Photovoltaic (PV) Arrays AS/NZS 3000 Electrical Installations (known as the Wiring rules) AS/NZS 3008 Electrical Installations Selection of cables AS/ZNS 3017 Electrical installations Testing User Guides AS/NZS 3100 Approval and test specification - General requirements for electrical equipment REVISION A JANUARY 2013 Page 15 of 22

Appendix A: Definitions and terms AEMO means the Australian Energy Management Operator (or its successor); applicable inverter means inverters that have been tested by an authorised testing laboratory and certified as being in compliance with AS 4777 and issued with an accreditation number; applicable regulations means any law, Code, Rule or other regulatory instrument which binds participants in the South Australian electricity industry, as amended from time to time. A reference to applicable regulations, including specific instruments, remain a reference to all other applicable regulations even where that instrument ceases to exist; distribution network means SA Power Networks electricity distribution network; Connection Point means the agreed point of supply established between SA Power Networks and the Customer and/or Embedded Generator; Customer means a person who engages in the activity of purchasing electricity supplied through the distribution network to a Connection Point; Electricity Distribution Code means the Electricity Distribution Code made by ESCOSA pursuant to Section 28 of the Essential Services Commission Act, 2002; Embedded Generator means a Generator, who owns, operates or controls an embedded generating unit. embedded generating unit means a generating unit connected within a distribution network and not having direct access to a transmission network. ESCOSA means the Essential Services Commission of South Australia; generating system means all Generating Units and the associated control and protection equipment; generating unit means the actual generator of electricity and all related equipment essential to its function as a single entity. Generator means a person / entity who engages in the activity of owning, controlling, or operating a generating system that supplies electricity to, or who otherwise supplies electricity to, a transmission or distribution network. REVISION A JANUARY 2013 Page 16 of 22

inverter the device that forms part of the Generating System which uses semi conductor devices to transfer power between a DC source and an AC source or load; large-embedded generation installation for the purpose of this User Guide, a large-embedded generation installation is defined as: All other embedded generation installation not covered by the requirements of the Australian Standard AS 4777, Grid connection of energy systems via inverters. This definition includes but is not necessarily limited to such initiatives as: photovoltaic (PV) installations greater than 10 kva (single phase) or 30 kva (three phase); large fuel-cell installations; wind turbine generating units; and synchronous and asynchronous generating units driven by hydro turbines or gas/diesel engines. nameplate capacity means the maximum continuous output (in kw or MW) of an item of equipment as specified by the manufacturer, or as subsequently modified; National Electricity Rules (NER) means the rules as defined in the National Electricity Law as set out in the Schedule to the National Electricity (South Australia) Act 1996; Proponent means the Generator, Customer or developer or their agent (i.e. Consulting Engineers); Retailer means the holder of an electricity retail licence granted under the Electricity Act, 1996, who is contracted to sell electricity to the Customer at the Supply Address; small-embedded generation installation For the purpose of this User Guide a small-embedded generation installation is defined as: An embedded generation installation complying with the requirements of the Australian Standard AS 4777, Grid connection of energy systems via inverters, Parts 1, 2 & 3: Part 1: Installation Requirements; Part 2: Inverter Requirements; and Part 3: Grid Protection Requirements. This definition includes but is not necessarily limited to Generating Systems such as: photovoltaic (PV) installations; small wind turbine generating units small fuel-cell installations; Supply means the delivery of electricity supply address means the address at which SA Power Networks supply the Generator and / or Customer with electricity; transmission network means ElectraNet s electricity transmission network. REVISION A JANUARY 2013 Page 17 of 22

Appendix B: Detailed Description of the Connection Application Process Chapter 5A of the National Electricity Rules applies to: any large Embedded Generator that is not required to be a Code Participant in accordance with the National Electricity Rules; or any large Embedded Generator that is exempt under the Electricity Regulations 1997 from the requirement to be licensed as a Generator under the Electricity Act. SA Power Networks has established procedures in place to process requests for connection of embedded generating units to the distribution network that must comply with the NER. Prior to connection of an embedded generating unit to the distribution network, SA Power Networks must carry out a detailed analysis study of the network. This is to verify that the proposed installation of the embedded generating unit will not cause any adverse effects on the network. On receipt of an initial or preliminary enquiry for the connection of an embedded generating unit, SA Power Networks will prepare a preliminary response to the Proponent, which will include: a description of our process; a description of the requirements that you must comply with; information which you must prepare to enable SA Power Networks to process an Application for a Connection Service; and the amount of the Offer Preparation Fee, payable on lodgement of an Application for a Connection Service, to cover SA Power Networks costs to complete the investigation and prepare the Offer to Connect. For the proposed project to proceed beyond a preliminary enquiry, an Application for a Connection Service must be submitted by the Proponent. The Application for a Connection Service must include the technical details of the proposed generating unit(s), generating unit(s) export capacity, and the proposed Connection Point and include the payment of the Offer Preparation Fee. Chapter 5A of the NER describes the timelines associated with your Application for a Connection Service. On receipt of your Application for a Connection Service, SA Power Networks will provide you with an Offer to Connect as outlined below: All costs payable by the Customer for SA Power Networks to undertake all of the electricity infrastructure work required to connect the Generating System; An Network Ongoing Connection Contract which will cover the terms and conditions of the ongoing supply/connection; and A Construction Terms agreement. REVISION A JANUARY 2013 Page 18 of 22

Appendix C: SA Power Networks Technical Requirements Embedded generating systems that are capable of being operated in parallel with the distribution network must be assessed for the potential impact the generating system may have on the local distribution network and the suitability of the installation with respect to SA Power Networks requirements. This requirement applies to all generating systems that have the capability to connect to the distribution network. In addition to the Electricity Distribution Code, AS 3000, AS 4777 and all applicable standards, the requirements for Generating Systems that are compliant with AS4777 and have a nameplate capacity less than 200kW are outlined below: C.1 Embedded generation protection requirements The protection shall be designed in accordance with the applicable regulations and SA Power Networks standards. The Embedded Generator must submit complete details of the generator protection system including the proposed settings to SA Power Networks for review and agreement. Anti Islanding The installation must incorporate additional anti-islanding protection with a suitable relay with both vector shift and rate of change of frequency (ROCOF) protection elements; It is recommended that any additional anti-islanding protection installed by the Customer be capable of automatically reconnecting to the Network once the Network voltage and frequency have been maintained with their tolerable range for a minimum of 1 minute. Voltage Balance Three phase inverters must be configured to ensure reasonably balanced output to all phases at all times whilst connected to our distribution system. All three phases of the inverter must simultaneously disconnect from, or connect to, our distribution system in response to protection or automatic controls (eg anti islanding trip and subsequent reconnection). Where multiple single phase inverters are connected to more than one phase, the inverters must be interlocked and configured to behave as an integrated multiphase inverter providing a reasonably balanced output to all connected phases at all times whilst connected to our distribution system. Alternatively, where inverters cannot be interlocked by internal controls, the installation must be protected by a phase balance relay which must immediately isolate the inverter in the absence of reasonable balance. The inverters must be physically prevented from operating independently and all installed inverters must simultaneously disconnect from, or connect to, our distribution system in response to protection or automatic controls (eg anti islanding trip and subsequent reconnection). Under/Over Frequency Under and over frequency protection must be installed at the Connection Point. The frequency protection set point will be based on the Embedded Generator s proposed distribution network connection arrangement and operating requirements, as per Section C.2 of this User Guide. Under/Over Voltage Under and over voltage protection must be installed to monitor all three phases at the Connection Point. This protection is set to detect if the phase to neutral voltage on any phase at this point exceeds predetermined values, which will be based on the embedded generator s REVISION A JANUARY 2013 Page 19 of 22

proposed distribution network connection arrangement and operating requirements, as per Section C.2 of this User Guide.. Protection equipment requirements All protection equipment must comply with the relevant IEC standards. All protection equipment must be tested and commissioned by a competent commissioning officer, to the agreed settings, and a certified copy of the commissioning results plus a Certificate of Compliance for the complete large-embedded generating unit installation must be issued by the Embedded Generator to SA Power Networks prior to connection to the distribution network. The Embedded Generator must keep a written record of all protection settings and test results. A copy of this record should be available at the Connection Point or as required by SA Power Networks. C.2 Quality of supply considerations Generating System must not impact on the quality of supply to SA Power Networks other Network Users. The Generating System must comply with all applicable requirements of the NER and the EDC, including but not limited to: Network Stability; Network Infrastructure Thermal Capacity; Network Voltage Control; Generating System Reactive Capability (power factor); Voltage Fluctuations; Harmonics; and Voltage Balance. Voltage and frequency ranges of operation The inverter and customer installation must be designed, installed, and maintained in a manner that ensures that the maximum steady state voltage at any socket outlet or fixed equipment (other than the Inverter) within the installation complies at all times with the requirements of Australian Standard 4777 (Grid connection of Energy Systems via Inverters). The following specific voltage and frequency settings must be programmed into the Inverter: Voltage: Where the Inverter has a maximum voltage limit for sustained operation (based on averaged measurements over periods ten minutes or less), this parameter must be set no higher than 257V. If the Inverter does not have a maximum voltage limit for sustained operation setting, the anti islanding maximum voltage trip point (based on a short term measurement) must be set to a low enough voltage depending on the installation characteristics, to ensure compliance. Failure to design for this requirement may expose appliances and fixed equipment to potentially damaging voltages. Frequency: Minimum frequency trip point (Fmin) is 48 Hz. Maximum frequency trip point (Fmax) is 52 Hz. If voltage and/or frequency fall outside the set limits, the Generating System must be automatically disconnected from our Network. The reconnection procedure must comply with AS 4777. REVISION A JANUARY 2013 Page 20 of 22

Appendix D: Information Required for an Application for a Connection Service Should you wish to proceed with an Application for a Connection Service you must complete and return the information requested in Table D.1. Generating Systems AS4777 compliant and up to 200kW nameplate capacity Table D.1: Information Required for an Application for a Connection Service Information Required Description Information, Notes & Feedback (attach information separately as required) Site Details Customer NMI Site Address End User Details End User (Customer) Name Inverter Details Total inverter capacity (kw) Inverter manufacturer Inverter size and model Installer Details Installer Business Name (if different to Contractor) Installer Name Connection Arrangement Protection Details Program Dates --- Continued on Next Page --- Installer BCSE Accreditation Number Connection arrangement of the installation, including a detailed single line diagram showing all required protection devices Single Line Diagram showing connection arrangement of the inverters Site Plans - detailed site plans Consumer mains size / type / number of cables Sub mains size / type / number of cables Product specification/details on the back up anti-islanding protection relay Proposed protection settings, value and delay, for the inverters (o/u freq, o/u voltage) Proposed protection settings, value and delay, for the back up anti-islanding protection relay (o/u freq, o/u voltage, ROCOF, Vector Shift) Construction Start & Completion date Forecast Generating System connection date Refer next page Refer next page REVISION A JANUARY 2013 Page 21 of 22

Generating Systems AS4777 compliant and up to 200kW nameplate capacity Table D.1 continued Device Parameter Setting Delay (sec) Inverter Protection Back Up Anti- Islanding Protection 1 Over-voltage (V) Under-voltage (V) Over-frequency (f) Under-frequency (f) Active anti-islanding Over-voltage 1 (V) Over-voltage 2 (V) Under-voltage 1 (V) Under-voltage 2 (V) Over-frequency 1(f) Over-frequency 2 (f) Under-frequency 1 (f) Under-frequency 2 (f) Vector Shift ( o ) Rate of Change of Frequency (Hz/s) Unbalance/asymmetry (if applicable) Notes: 1. Back up anti islanding protection settings are not required for SA Power Networks to undertake the feasibility assessment however these settings must be submitted to SA Power Networks no later than 3 months prior to your proposed Generating System commissioning date. REVISION A JANUARY 2013 Page 22 of 22