Electrical tests
Diagnostic electrical testing for transformers and substations
Each test isolates a different failure mode. We run them with Omicron and Megger instrumentation, correct for temperature and deliver a protocol compared against standards and asset history.
Transformer turns ratio test (TTR)
Verifies the turns ratio between high- and low-voltage windings to detect shorted turns, tap-changer faults and connection errors.
Learn moreInsulation power factor and Tan Delta
Measurement of dielectric losses in transformer and bushing insulation to detect moisture, contamination and paper-oil ageing before they cause failure.
Learn moreInsulation resistance and polarization index
Measurement of insulation resistance with a megohmmeter and calculation of absorption and polarization indices to assess moisture and cleanliness of the dielectric system.
Learn moreDissolved gas analysis in oil (DGA)
Chromatography of the insulating oil to detect incipient faults — arcing, partial discharge and hot spots — from the gases dissolved in the oil, without de-energizing the transformer.
Learn moreSweep frequency response analysis (SFRA)
SFRA test that detects mechanical deformation and displacement of windings and core — invisible to conventional electrical tests — after short circuits, transport or earthquakes.
Learn moreTransformer winding resistance test
Measurement of the DC resistance of windings to detect loose connections, broken strands and bad tap-changer contacts.
Learn moreTransformer excitation current test
Measurement of the no-load current the transformer draws to detect shorted turns, core defects and tap-changer faults.
Learn morePhysicochemical oil analysis
Battery of physical and chemical tests on transformer oil to assess its condition and decide reconditioning, regeneration or replacement.
Learn moreMoisture in oil (Karl Fischer)
Measurement of water content in transformer oil by Karl Fischer titration — moisture is one of the main accelerators of insulation ageing.
Learn moreFuran analysis (paper ageing)
Measurement of furanic compounds in oil to estimate the ageing of the solid insulation (paper) — the part of a transformer that cannot be renewed.
Learn morePCB (askarel) content in oil
Testing transformer oil for polychlorinated biphenyls (PCB / askarel) — a regulatory and environmental compliance requirement before servicing or disposal.
Learn moreGround (earthing) system measurement
Measurement of the resistance and integrity of a substation grounding system to ensure personnel safety and correct protection operation.
Learn moreSF6 circuit breaker testing
Testing of SF6 high-voltage circuit breakers: gas quality, contact resistance, timing and mechanism, to ensure reliable interruption.
Learn moreTalk to a transformer specialist
Tell us about your asset and we'll respond with a diagnosis and a tailored quote — not generic pricing.