New Zealand Gazette – 2003 – No. 122

Page 3329

✨ Reliability Performance Measures



REGULATION 22

RELIABILITY PERFORMANCE MEASURES

YEAR ENDED 31 MARCH 2003

Interruptions

2004/8 Target 2004 Target 2003 2002 2001 2000
Total Interruptions 583 476 553 494
a) Planned Interruptions (Class B) 290 300 324 281 360 342
b) Unplanned interruptions (Class C) 145 240 259 195 193 152
Unplanned Interruptions not restored within:
a) 3 Hours (%) 3.68% 29.70% 15.50% 13.15%
b) 24 Hours (%) 0.03% 1.00% 7.00% NIL

Faults

2004/8 Target 2004 Target 2003 2002 2001 2000
Faults/100km
a) Total No. of faults 7.50 8.00 8.96 7.51 7.50 5.98
i) 33kV Line Voltage
a) Total no. of faults 2.00 3.00 3.58 2.57 6.96 1.90
ii) 11kV Line Voltage
a) Total no. of faults 7.6 8 8.89 7.91 7.48 6.45

| Faults/100km of Underground Line |
| a) Total | | | 10.06 | 11.65 | 10.60 | 14.56 |
| b) 33kV | 10.06 | | | 10.87 | | 15.27 |
| c) 11kV | | | 10.06 | 11.46 |

| Faults/100km of Overhead Line |
| a) Total | | 12.52 | 6.73 | 7.10 | 4.55 |
| b) 33kV | 3.20 | 2.82 | 7.70 | | 2.03 |
| c) 11kV | | 9.31 | 7.21 | 6.90 | 4.87 |

RELIABILITY MEASURES

2004/8 Target 2004 Target 2003 2002 2001 2000
TOTAL SAIDI OVERALL 96.61 101.63 385.03 103.99
SAIDI
a) Planned Interruptions (Class B) 29 31 24.52 31.60 62.68 56.60
b) Unplanned Interruptions (Class C) 86 94 72.08 69.10 81.27 47.30
TOTAL SAIFI OVERALL 2.02 2.14 4.75 1.48
SAIFI
a) Planned Interruptions (Class B) 0.5 0.6 0.22 0.25 0.41 0.41
b) Unplanned Interruptions (Class C) 1.81 1.9 1.80 1.89 2.34 1.06
b) Unplanned Interruptions TransPower (Class D) 0.39 2.00

| Total CAIDI OVERALL | | | 66.6 | 47.49 | 81.06 | 70.3 |
| CAIDI |
| a) Planned Interruptions (Class B) | 58 | 52 | 172.33| 126.6 | 143 | 136.7 |
| b) Unplanned Interruptions (Class C) | 48 | 49 | 56.25 | 36.56 | 34.8 | 44.5 |
| b) Unplanned Interruptions TransPower (Class D) | | 49 | 2.23 | | 123 |

Note: Reliability measures above are calculated on a time weighted basis to reflect the the acquisition of Taupo and Rotorua Networks from United Networks on 1 November 2002. All performance targets for 2004 onwards reflect the ownership of the assets for a twelve month period.



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Online Sources for this page:

VUW Te Waharoa — PDF NZ Gazette 2003, No 122


Gazette.govt.nz — PDF NZ Gazette 2003, No 122




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Reliability Measures, Interruptions, Faults, SAIDI, SAIFI, CAIDI, Electricity Regulation