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HV Cable Diagnostics …a Reality at Last!

Written by Trevor Lord, Director, AVO New Zealand and LORD Consulting

Cable Diagnostics Paper 1

…AVO NZ proudly delivers this long-sought capability

HV Cable Assets constitute in many EDB’s and private networks one of the largest asset groups by replacement value. In some of the larger EDB’s this may represent as much as $1.5 to $2 billion. Alarmingly, and at odds with almost all other asset classes managed by such networks, almost nothing is known about the asset condition of each individual cable. Effective HV cable asset management is seriously fraught by this situation. With the parallel scenario of above-ground infrastructure management challenges now painfully troubling the Industry, the risks posed by not knowing the condition of HV cable assets is now a very pressing problem, given the age profile of such assets and the uncertain dynamic of asset aging modelling.

For nearly 30 years AVO NZ has made it our business to lead the NZ Power Industry with innovations to improve the quality of HV (11-33kV) cable management. Techniques from advanced cable fault location that offers minimal cable damage in the process, diagnostic insulation testing, cable location and GPR surveys to avoid third party damage, VLF testing of cables, VLF Tan Delta, VLF Partial Discharge, and on-line PD testing were all introduced first to NZ clients by AVO NZ.

Notwithstanding the valuable contributions these were and have been to date, the major gap that remained was that cable management in NZ has been almost entirely reactive… with cable reliability judged by cable fault statistics only and, consequently, with no verifiable idea whatsoever of pending risk of failure or replacement. The asset management implications of this scenario are, frankly, frightening.

In 2017 AVO New Zealand brought to New Zealand a practicable, patented, cost-effective, and long-proven means to conduct a widespread proactive cable diagnostic regime. This now largely dominates the European and Asian/Middle Eastern regions and is attracting major interest in NZ and Australia presently….and for very good reason.

Uniquely in the world uptake of such proactive cable testing technology, AVO New Zealand was greatly concerned that the technology would not be available to the wider EDB and private networks of NZ (Industry, Generation etc) unless a deployment model underpinned by contracted service providers was implemented. AVO NZ has made it our business to put such a model in place for the benefit of the wider NZ market and we now have several major contracting companies lined up to take up the service and one major EDB having purchased their own. Industrial and EDB clients are now listing with us to broker an optimal outcome using this patented world-leading technology. The model is ‘live’ and we welcome your needs in this area so that we can best match a service delivery model that is optimal for your needs.


Call Trevor Lord, Director, AVO NZ,
0800 485 990
for a conversation
AVO NZ…. committed to take the NZ Industry to a better place in cable management

Cable Diagnostics Paper 3

Cable Diagnostics Paper 2