Electricity Asset Management Plan 2019-2029
190
Vector Limited://
It is highly likely that in areas that have been identified for conductor replacement that some poles will need to be replaced especially in some parts of the Auckland area where lower strength poles were used in years gone by. Standard AS/NZS7000 requires that engineering assessments of major overhead line components be undertaken when the mechanical load is being altered. The need for replacement of some or all poles will be determined during detail design of conductor replacement projects. All crossarms and insulators will be replaced as part of reconductoring projects. Our Conductor CBARM model was used to inform our programme of works to select which conductors to replace in the AMP period. To prevent the probability of failure to increase over the AMP period to unmanageable levels an intervention programme as per the investment summary below must be undertaken - that will result in a health index at the end of the AMP period (2029) as shown in the graph below. The present health index at the start of this AMP period, i.e. 2019 health index (referred to as year 0 in our models), is shown in Section 4, Our Assets. The health index at the end of the AMP period if no work is undertaken, i.e. 2029 (referred to as year 10 in our models), is also shown in Section 4.
Figure 5-2 Health index at year 10 with Intervention – OH MV Conductor
TARGETED OUTCOMES
CUSTOMER EXPERIENCE
SAFETY
RELIABILITY
RESILIENCE
OPERATIONAL EFFICIENCY
CYBER SECURITY AND PRIVACY
OPTIONS CONSIDERED Options to address the need identified above have been assessed and are summarised in the following table.
Made with FlippingBook - professional solution for displaying marketing and sales documents online