High Voltage Testing Services Australia
Last reviewed: July 2026 by Matt Geoghegan, CEO, Megavar
Comprehensive Diagnostic Testing for HV Assets from 11 kV to 500 kV
High-voltage testing is the primary method for verifying the integrity, performance, and safety of electrical assets. Whether commissioning new equipment, performing routine maintenance, investigating a fault, or assessing asset condition, Megavar’s testing services provide the data you need to make informed decisions about your HV infrastructure.
We test transformers, switchgear, circuit breakers, protection relays, cables, instrument transformers, and earthing systems using a 200+ item test equipment fleet spanning Omicron, Megger and other leading brands. All testing is performed to AS/NZS, IEC, and IEEE standards, with detailed diagnostic reporting that goes beyond pass/fail — we interpret results and provide actionable recommendations.
What is high voltage testing?
High voltage testing is the controlled application of electrical tests to HV assets, transformers, switchgear, circuit breakers, cables, protection relays, instrument transformers and earthing systems, to verify insulation integrity, performance and safety. It is carried out when commissioning new equipment, during routine maintenance, when investigating a fault, and when assessing asset condition, with results captured in detailed diagnostic reports.
Voltage range
11kV to 500kV
Standards
AS/NZS, IEC and IEEE
Equipment
Coverage
Australia-wide, four offices
Deliverable
Detailed diagnostic test reports
What We Test
Power Transformers
TTR, winding resistance, insulation resistance, tan delta, SFRA, excitation current, short-circuit impedance, DGA, oil quality, OLTC dynamic resistance, and bushing power factor. See our dedicated Transformer Testing page for full details.
Switchgear and Circuit Breakers
Contact resistance (DCRM), insulation resistance, timing tests (open/close/reclose), SF6 gas quality and pressure, mechanical operation counting, and trip/close coil current analysis using Omicron CIBANO 500.
Secondary injection testing of all protection functions using Omicron CMC 356 and CMC 256plus. Primary injection for end-to-end verification using CPC 100 and CP CU1. See our dedicated Protection Relay Testing page.
HV Cables
VLF withstand, VLF partial discharge, DC insulation resistance, sheath integrity, tan delta, and fault location. See our dedicated HV Cable Testing page.
Instrument Transformers
Earthing Systems
When HV Testing Is Required
- New installation commissioning (site acceptance testing)
- Routine maintenance testing (time-based or condition-based programmes)
- Post-fault investigation after protection operation or equipment failure
- Condition assessment for ageing or critical assets
- Pre-purchase due diligence for asset acquisition
- Insurance compliance and risk assessment
- Post-transport testing for relocated equipment
Test Equipment
Omicron CMC 356, CMC 256plus, CPC 100, CP CU1, CT Analyzer, CIBANO 500, MPD 600, Megger insulation testers, Fluke thermal imaging, earth resistance testers, and DGA sampling equipment. All calibrated traceable to NMI.
Check the CMC 500 relay test set.
Frequently Asked Questions
High Voltage (HV) Testing
What types of HV testing does Megavar perform?
How often should HV equipment be tested?
Does Megavar provide diagnostic interpretation or just test data?
Can testing be scheduled around operational shutdowns?
Yes. We work closely with system operators and asset owners to plan testing within maintenance windows, minimising outage duration while ensuring all required tests are completed.
Does Megavar test equipment nationally?
Yes. We deploy from offices in Tasmania, South Australia, New South Wales, and the ACT to sites across all states and territories.
Does Megavar provide HV testing for renewable energy projects?
Ready to commission your substation? Contact Megavar today on 1300 730 499 or visit our contact page to request a quote.
Why Choose Megavar For High Voltage (HV) Testing?
- Unmatched Expertise: With decades of combined experience in HV systems, Megavar’s team delivers accurate, reliable testing outcomes across all industries.
- Dependability: Our commitment to safety, precision, and compliance means you can trust every test result—every time.
- Safety as Standard: Testing high-voltage infrastructure requires extreme caution. We prioritise rigorous safety protocols to protect both people and assets.
- Safety First: Prioritising safety in all operations, we protect both our team and your assets.
- End-to-End Solutions: From acceptance testing and routine diagnostics to fault-finding and condition assessments, Megavar provides comprehensive HV testing services tailored to your needs.
Choose Megavar as your trusted partner for high voltage testing and discover the confidence that comes with precision, safety, and unmatched expertise.
For all your high-voltage (HV) testing needs, contact us today – we’re here to help.
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