Local Loss Factors
Local loss factors for the Northpower Network - Applicable From 1 April 2009
In accordance the Reconciliation Rules in the Electricity Governance Rules (EGR’s), Northpower has reviewed the Local Loss Factors applicable to the Northpower Network.
The Loss Factor Group for each ICP is determined by the voltage and the location within the Distribution Network at which each ICP is metered.
Table 1 indicates the Loss Factor values applicable to each Local Loss Factor Group from 1 July 2002 and from 1 April 2009. These values have been derived from load-flow modelling of sub-transmission, distribution and LV feeders.
Table 1: Local Loss Factor Groups and Local Loss Factors for ICP’s connected to the Northpower network
| Loss Group code | Metering Voltage | Capacity Group | Loss Factor from 1 July 2002 | Loss Factor from 1 April 2009 |
|---|---|---|---|---|
| L0 | 33kV | ICP’s metered at or adjacent to the GXP | 1.000 | 1.000 |
| L1 | 33kV | ICP 0000546037NR9E6 | 1.016 | 1.023 |
| L2 | 11kV | All ICP’s metered at 11kV | 1.027 | 1.045 |
| L3 | 400V | ICP’s of 150kVA or greater capacity, metered at 400V adjacent to the Distribution transformer | 1.059 | 1.053 |
| L4 | 400V | Same as L5 | 1.059 | 1.068 |
| L5 | 230/400V | ICP’s of less than 150KVA capacity, metered at 230/400V on LV distribution network. | 1.059 | 1.068 |
The above local loss factors may be added to, altered or deleted at any time at the sole discretion of the Distributor (Northpower). L4 is presently largely unused.
Illustration of how the Local Loss Factors are applied:
If a meter at an ICP in Loss Group L5 recorded a net usage of 1000 kWh, the equivalent energy at the GXP would be deemed 1.068 x 1000 kWh = 1068 kWh from 1 April 2009.
Differences between Technical Losses and Non-technical Losses
The Local Loss Factors are an approximation of the Technical Losses on the Network. Non-technical losses are derived by subtracting the total annual consumptions for all ICP’s (with each multiplied by the appropriate Local Loss Factor) from the total annual inputs to the network (supplied from the grid and from embedded generation).