Electrical Testing for
Safe Energisation
Protection, transformer, switchgear, cable, earthing and battery testing, tailored to your equipment, protection philosophy and project specifications.
Prove it works, record it, track it
Verify
Installation and protection performance confirmed before energisation.
Baseline
Measurements recorded to guide ongoing maintenance.
Assess
Insulation, switching mechanisms and asset condition assessed to support operational decisions.
From high voltage to protection relays
We test the full chain, from HV cables and transformers through switchgear and instrument transformers to the protection relays that trip the breaker. Open a group to see the test scope.
HV cablesInsulation, sheath, joints and terminations
| Asset | Test scope |
|---|---|
| HV cables | Very Low Frequency (VLF) withstand, sheath integrity, tan delta, insulation resistance, polarisation index where suitable, online and offline partial discharge |
Power transformersInsulation, windings, tap-changers and oil-paper
| Area | Test scope |
|---|---|
| Insulation | Insulation resistance, polarisation index, tan delta and capacitance, online and offline partial discharge |
| Windings | Vector group, HV/LV winding resistance, turns ratio, excitation current |
| Tap-changers | Dynamic resistance during on-load tap-changer operation |
| Winding integrity | Short-circuit impedance, leakage reactance, Sweep Frequency Response Analysis (SFRA) |
| Oil-paper | Dielectric response (DIRANA), dissolved gas and furan analysis |
Switchgear, circuit breakers and switchboardsHV and LV
| Asset | Test scope |
|---|---|
| HV switchgear | Insulation resistance, power-frequency withstand, contact resistance, breaker timing, undervoltage and shunt-trip coil pickup/dropout, interlocks |
| HV and LV circuit breakers | Insulation, power-frequency withstand, polarisation index, contact resistance and timing, static/dynamic measurements, tan delta and partial discharge where applicable |
| LV switchgear and trip units | Insulation and contact resistance, interlocks, trip-unit pickup/dropout, long-time, short-time, instantaneous and earth-fault timing as fitted |
| HV and LV switchboards | Functional and interlock testing of controls, protection, metering, indications and alarms; online and offline partial discharge |
Instrument transformersCurrent and voltage transformers, HV and LV
| Asset | Test scope |
|---|---|
| Current transformers | Ratio and polarity, magnetisation curve and knee point, winding resistance, insulation diagnostics |
| Voltage transformers | Ratio, polarity and winding resistance, insulation diagnostics |
Protection relays and schemesFrom relay element to breaker trip
| Asset | Test scope |
|---|---|
| Protection relays | Pickup/dropout and timing by secondary injection; primary injection through CT circuits, relay logic and breaker tripping |
| Breaker protection integration | On-board relay setup to approved settings, verified by primary and secondary injection |
| Transformer protection | Through-fault stability: CT polarity, ratio and phase compensation, relay wiring and restraint |
| Bus-zone protection | Primary-injection stability: CT polarity, zone allocation, current summation and trip logic |
Earthing and DC supply systemsEarth grids and protection battery supplies
| Asset | Test scope |
|---|---|
| Earthing systems | Soil resistivity, earth-grid impedance, step and touch potential |
| DC power and battery systems | Battery commissioning checks; battery-bank discharge load testing |
Pre-installation testingEquipment tested on site before it is installed and energised
| Equipment | Test scope |
|---|---|
| Protection relays and trip units | Pickup/dropout, timing and logic by secondary injection, with approved settings applied |
| Instrument transformers | Ratio, polarity, magnetisation curve and winding resistance |
| Circuit breakers and mechanisms | Insulation and contact resistance, contact timing, operating-sequence checks |
| Settings and functional verification | Checked against approved settings and drawings, with results recorded as baseline measurements |
How every test job runs
All testing is carried out in the field, on your site, so faults are found before energisation, not after.
- Before work startsScope and test plan agreed
Test methods, applied values and acceptance criteria confirmed with you in writing.
- Before installationEquipment pre-tested on site
Relays, trip units, CTs and breakers checked on arrival, before they are installed.
- Before energisationTested to approved settings
Protection set and proven against your approved settings, from primary injection to breaker trip.
- At handoverResults recorded as a baseline
Measurements documented for commissioning sign-off and future condition assessment.
- Manufacturer instructions
- Approved drawings
- Project specifications
- Applicable standards
Discuss the scope
Why Choose Us
Reliable Services Backed by Trusted Professionals.
Our certified engineering team provides technical knowledge and precision for end-to-end electrical asset management.
Every system is rigorously tested and built to deliver exceptional durability and full AS/NZS compliance.
Optimized production workflows allow us to provide premium industrial solutions with guaranteed competitive pricing.
We deliver dedicated technical confidence with responsive engineering support before and after project delivery.