Page 16 of 190 Report No.: 6068396.50 TRF No. G99/1-4_V1.0 G99/1 Clause Requirement - Test Result - Remark Verdict 7.7.1 Voltage Management Units are becoming more popular and use various methods, in most cases, to reduce the voltage supplied from the DNO’s Distribution Network before it is used by the Generator. In some cases where the DNO’s Distribution Network voltage is low they may increase the voltage supplied to the Generator. Some technologies are only designed to reduce voltage and cannot increase the voltage. Info.
7.7.2 The use of such equipment has the advantage to the Generator of running appliances at a lower voltage and in some cases this can reduce the energy consumption of the appliance. Some appliances when running at a lower voltage will result in higher current consumption as the device needs to take the same amount of energy from the system to carry out its task. Info.
7.7.3 If a Voltage Management Unit is installed between the Connection Point and the Power Generating Module in a Generators Installation, it may result in the voltage at the Generator side of the Voltage Management Unit remaining within the limits of the protection settings defined in Table 10.1 while the voltage at the Connection Point side of the unit might be outside the limits of the protection settings. This would negate the effect of the protection settings.
Therefore, this connection arrangement is not acceptable and all Power Generating Modules connected to the DNO’s LV Distribution Network under this Engineering Recommendation must be made on the Connection Point side of any Voltage Management Unit installed in a Generator’s Installation. Info. 7.7.4 Generators should note that the overvoltage setting defined in Table 10.1 is 4% above the maximum voltage allowed for the voltage from the DNO’s Distribution Network under the ESQCR and that provided they have designed their installation correctly there should be very little nuisance tripping of the Power Generating Module.
Frequent nuisance tripping of a Power Generating Module may be due to a fault in the Generator’s Installation or the operation of the DNO’s Distribution Network at too high a voltage. Generators should satisfy themselves that their installation has been designed correctly and all Power Generating Modules are operating correctly before contacting the DNO if nuisance tripping continues. Under no circumstances should they resort to the use of Voltage Management Units installed between the Connection Point and the Power Generating Module. P 8 Earthing P 8.1 General P 8.1.1 The earthing arrangements of the Power Generating Module shall satisfy the requirements of DPC4 of the Distribution Code. P