Page 15 of 190 Report No.: 6068396.50 TRF No. G99/1-4_V1.0 G99/1 Clause Requirement - Test Result - Remark Verdict 7.5.1 Connection of single phase Power Generating Modules may require Distribution Network reinforcement and extension before commissioning for technical reasons (such as voltage issues and unacceptable phase imbalance) depending on the point of connection and Distribution Network design. N/A 7.5.2 A solution to these voltage issues and phase imbalance issues may be to utilise 3-phase Power Generating Modules or to use multiple single phase Power Generating Modules connected across three phases.
N/A 7.5.3 Where single phase Power Generating Modules are being used the Generator should design the installation on a maximum unbalance output of 16 A between the highest and lowest phase. N/A 7.5.4 In order to illustrate this requirement examples of acceptable and unacceptable connections have been given in Annex A.5. N/A 7.6 Type A Power Generating Module capacity for single and split LV phase supplies Type B C D Power Generating Modules. N/A 7.6.1 The maximum aggregate capacity of Power Generating Modules that can be connected to a single phase supply is 17 kW. The maximum aggregate capacity of Power Generating Modules that can be connected to a split single phase supply is 34 kW.
N/A 7.6.2 There is no requirement to provide intertripping between single phase Inverters where these are installed on multi- phase supplies up to a limit of 17 kW per phase (subject to balance of site output as per Section 7.5). A single phase 17 kW connection may result in an imbalance of up to 17 kW following a Distribution Network or Power Generating Module outage. However the connection design should result in imbalance under normal operation to be below 16 A between phases as noted above. N/A 7.6.3 Power Generating Facilities with a capacity above 17 kW per phase are expected to comprise three phase units.
The requirement to disconnect all phases following a fault in the Generator’s Installation or a Distribution Network outage applies to three phase the Power Generating Modules only and will be tested as part of the compliance testing of the Power Generating Module. In some parts of the country where provision of three phase networks is costly then the DNO may be able to provide a solution using single or spilt phase networks for Power Generating Facilities above the normal limits as set out above. N/A 7.7 Voltage Management Units in Generator’s premises info.