SPM LTDS Appendix 4 Fault Levels (Table 4) 132kV 3ph

The "SPM LTDS Appendix 4 Fault Levels (Table 4) 132kV 3ph" dataset provides plant fault levels for the distribution system as at the data freeze date. A small number of authorised proposals that will be completed after the data freeze date and that will potentially have a significant impact on fault levels have also been included in order to provide the most appropriate system data that is currently available. These can be found in the main LTDS document Part 4: Development Proposals. For ease of reference, the table is displayed by voltage level. Voltage levels include 33 kV, 22 kV, 11 kV and 6.6 kV.

Short circuit currents are expressed in kA and have been calculated for three phase faults under maximum plant conditions. The tables provide details of the Peak Make and RMS Break duty. The three phase equipment rating (expressed in kA) refers to the RMS Break value. Switchgear ratings are also provided for each substation.

The fault level values provided in the appendix tables include a value for the assumed fault in-feed values from rotating apparatus associated with site load, in accordance with the guidelines contained in Engineering Recommendation G74. Although the load associated fault currents are included in the values, as an indication of the G74 magnitude, the G74 Peak Make component value is displayed. While in some cases apparatus capability may be in excess of the design limit, as described in Section 2.4.3, system fault levels will always be constrained within the relevant design limit. The tables indicate those locations where the predicted fault level is equal to or greater than 95% of the plant capability.

All lower voltage interconnection between Primary substations has been assumed to run normally open. Short circuit currents at customer locations are based on the assumed system configuration detailed in Appendix 9: System Schematics (Table 9).

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