At Megavar, mobility and precision go hand in hand. Our 500kV resonant frequency Hipot system is consistently on the road, enabling us to deliver top-tier pre-energisation testing and certification services across Australia. Whether it’s transformers, GIS, switchgear, or cables, our system ensures reliability every step of the way.
To further enhance our service delivery, we’ve recently customised a 20-foot shipping container, offering a secure, ruggedised transport solution. This setup allows for seamless load-on, load-off operations, ensuring that our sophisticated equipment reaches even the most remote locations intact and ready for action.
At Megavar, we’re committed to delivering innovative testing solutions that meet our clients’ needs, no matter where the job takes us.
Frequently Asked Questions
What is a 500kV resonant HiPot test system?
A 500kV resonant HiPot test system is a portable high voltage test set that generates AC test voltages up to 500kV using frequency resonance technology. The system tunes to the natural resonant frequency of the test circuit (typically 30 to 300 Hz), allowing it to achieve very high output voltages with relatively low input power. Megavar’s 500kV system is purpose-built for field deployment to substations, power stations and cable installation sites across Australia.
What can be tested with a 500kV HiPot system?
The 500kV system is used for high voltage withstand testing of power transformers (up to 500kV class), EHV cables, gas-insulated switchgear (GIS), generator stators, large bushings, and instrument transformers. It performs applied voltage tests, induced voltage tests, and partial discharge measurements during HiPot to provide comprehensive insulation assessment.
Why does Megavar use a resonant system instead of a conventional HiPot?
Resonant systems offer three key advantages. First, significantly lower input power requirements (a system with a Q factor of 50 needs only 2% of the output kVA as input). Second, inherent safety because the system cannot sustain a fault arc, since resonance collapses instantly upon insulation breakdown. Third, a pure sine wave output without harmonics, which provides a more accurate representation of service conditions than conventional test sets.
How portable is Megavar’s 500kV HiPot system?
The system is designed for rapid field deployment. It uses novel power-to-weight optimisation that makes it significantly lighter than comparable legacy test systems. It can be transported by standard vehicle and manoeuvred into tight substation yards with limited clearances. Megavar deploys this system nationally from our four offices in Tasmania, South Australia and New South Wales.
Is the 500kV HiPot system available for hire?
Yes. The 500kV resonant HiPot system is part of Megavar’s specialist test equipment hire fleet. It can be hired with a Megavar test technician for turnkey HV withstand testing, or as a standalone hire for organisations with qualified HV test personnel. Contact rentals@megavar.com.au or call 1300 730 499.
What standards govern HiPot testing of power transformers?
HiPot testing of power transformers is governed by IEC 60076 (Power Transformers) and IEEE C57.12.00, which specify applied voltage test levels, induced voltage test requirements, and partial discharge acceptance criteria. In Australia, these are referenced alongside AS 60076 and network-specific standards from transmission operators such as ElectraNet, TasNetworks and TransGrid.
