✨ Electricity Reliability Performance Measures




70

NEW ZEALAND GAZETTE

No. 3

B. RELIABILITY PERFORMANCE MEASURES (1999 REGULATIONS)

B1. Total number of interruptions, together with a breakdown of that total according to interruption class.

Interruption Class Number of Interruptions
2002 2001 2000 1999
MainPower Planned Shut-Down (Class B) 154 94 106
Unplanned Interruption (Class C) 74 191 189
Trans Power Planned Shut-Down (Class A) 3 - 1
Unplanned Interruption (Class D) - - 1
Generation Unplanned Interruption (Class E) - - -
Generation Other Unplanned Interruption (Class F) - - -
Other Other Interruptions (Class G) - - -
Unplanned Interruption (Class G) - - -
Total Interruptions 231 285 297

B2. The total number of faults per 100 circuit kilometres of prescribed voltage electric line.

Nominal Voltage Faults per 100 km Total
2002 2001 2000 1999
33 kV 1.40 1.78 2.04 3.32
11 kV 2.09 5.52 5.92 4.30
TOTAL 2.03 5.24 5.51 4.23

B3. The total number of faults per 100 circuit kilometres of Underground prescribed voltage electric line, together with a breakdown of that total according to different nominal line voltages.

Nominal Voltage Faults per 100 km Underground
2002 2001 2000 1999
33 kV - - - -
11 kV 3.15 5.30 7.89 1.17
TOTAL 3.08 5.19 7.69 1.14

B4. The total number of faults per 100 circuit kilometres of Overhead prescribed voltage electric line, together with a breakdown of that total according to different nominal line voltages.

Nominal Voltage Faults per 100 km Overhead
2002 2001 2000 1999
33 kV 1.41 1.79 0.75 3.35
11 kV 2.06 5.53 5.86 4.40
TOTAL 2.01 5.24 5.45 4.31

B5. The SAIDI for the total of interruptions:

213.73 151.96 116.94 204.71

B6. The SAIDI for the total number of interruptions within each interruption class:

Network or Generation Owner Classification Minutes per Connected Customer
2002 2001 2000 1999
MainPower Planned Shut-Down (Class B) 108.62 60.48 22.06 86.98
Unplanned Interruption (Class C) 52.12 91.48 71.55 103.27
Trans Power Planned Shut-Down (Class A) 52.98 - 22.27 14.46
Unplanned Interruption (Class D) - - 1.06 -
Generation Unplanned Interruption (Class E) - - - -
Generation Other Unplanned Interruption (Class F) - - - -
Other Other Interruptions (Class G) - - - -
Unplanned Interruption (Class G) - - - -

B7. The SAIFI for the total number of interruptions:

1.45 2.08 1.77 1.83



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Online Sources for this page:

VUW Te Waharoa PDF NZ Gazette 2004, No 3


Gazette.govt.nz PDF NZ Gazette 2004, No 3





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Electricity, Reliability, Performance Measures, Interruptions, Faults, SAIDI, SAIFI, MainPower, Trans Power