Technical capabilities

This page exists for the engineer sent to verify that we are real. It is the full technical scope, with the standard each activity is executed and reported against. No marketing language.

Ensaios de óleo no catálogo: 15
Test methods: 27
Designações de normas: 35

01What we do to the oil

Oil treatment

Processing carried out on site, with the transformer in place.

Scope

Vacuum purification, dehydration and degassing · hot-oil circulation · regeneration through Fuller's earth, removing acids and sludge rather than only particulates · full oil change and retrofill · retrofill to natural or synthetic ester · compliant used-oil disposal with chain-of-custody documentation.

Work executed and reported against

IEC 60422IEC 60814IEC 62021-1IEC 60156IEC 62535

Oil management programmes Oil treatment plant

Two technicians connecting hoses between a large black oil storage bladder and a treatment plant under a plastic sheet, beside a power transformer, the work area taped off — Oil treatment beside the transformer: the oil held in a bladder, the plant under cover and the area taped off.

02What we measure in the oil

Oil analysis

Sampling to IEC 60567. Condition limits assessed against IEC 60422 and IEEE C57.106.

Tests performed, with the standard each is executed to
Test	Standards	What it tells you
01Dissolved gas analysis	IEC 60567ASTM D3612	Fault gases indicate what is happening inside the tank — partial discharge, arcing or overheating each produce a different gas signature.
02Dielectric breakdown voltage	IEC 60156ASTM D1816	The oil's ability to withstand voltage. Falls sharply with moisture and particulate contamination.
03Acidity / neutralisation number	IEC 62021-1ASTM D664	Oxidation state. Rising acidity attacks paper insulation and precipitates sludge onto cooling surfaces.
04Water content	IEC 60814ASTM D1533	Moisture in oil migrates into paper, where it is far harder to remove and does far more damage.
05Dissipation factor (tan δ)	IEC 60247ASTM D924	Dielectric losses. A sensitive early indicator of contamination and ageing before breakdown voltage moves.
06Resistivity	IEC 60247	Insulating quality of the fluid. Falls with ionic contamination.
07Power factor	IEC 60247	Companion measurement to tan δ, reported where a client's records use it.
08Interfacial tension	ASTM D971	Detects polar decay products early — often before acidity has moved meaningfully.
09Corrosive sulphur	IEC 62535ASTM D1275	Corrosive sulphur attacks copper conductors and can deposit conductive copper sulphide in the insulation.
10Oxidation inhibitor content	IEC 60666ASTM D2668	Remaining oxidation inhibitor. Once depleted, ageing accelerates sharply.
11Pour point	ISO 3016ASTM D97ASTM D5950	Low-temperature behaviour, relevant to cold-start and high-altitude sites.
12Aniline point	ASTM D611ISO 2977	Aromatic content, which affects the oil's compatibility with gaskets and seals.
13Density	ASTM D1298	Baseline property; also identifies mixing of incompatible oils.
14Viscosity	ISO 3104ASTM D445	Affects convective cooling. A rise indicates oxidation.
15Colour	ASTM D1500ASTM D6045ISO 2049	Crude but immediate indicator of degradation, and useful for trending.

01Dissolved gas analysis
IEC 60567ASTM D3612
Fault gases indicate what is happening inside the tank — partial discharge, arcing or overheating each produce a different gas signature.
02Dielectric breakdown voltage
IEC 60156ASTM D1816
The oil's ability to withstand voltage. Falls sharply with moisture and particulate contamination.
03Acidity / neutralisation number
IEC 62021-1ASTM D664
Oxidation state. Rising acidity attacks paper insulation and precipitates sludge onto cooling surfaces.
04Water content
IEC 60814ASTM D1533
Moisture in oil migrates into paper, where it is far harder to remove and does far more damage.
05Dissipation factor (tan δ)
IEC 60247ASTM D924
Dielectric losses. A sensitive early indicator of contamination and ageing before breakdown voltage moves.
06Resistivity
IEC 60247
Insulating quality of the fluid. Falls with ionic contamination.
07Power factor
IEC 60247
Companion measurement to tan δ, reported where a client's records use it.
08Interfacial tension
ASTM D971
Detects polar decay products early — often before acidity has moved meaningfully.
09Corrosive sulphur
IEC 62535ASTM D1275
Corrosive sulphur attacks copper conductors and can deposit conductive copper sulphide in the insulation.
10Oxidation inhibitor content
IEC 60666ASTM D2668
Remaining oxidation inhibitor. Once depleted, ageing accelerates sharply.
11Pour point
ISO 3016ASTM D97ASTM D5950
Low-temperature behaviour, relevant to cold-start and high-altitude sites.
12Aniline point
ASTM D611ISO 2977
Aromatic content, which affects the oil's compatibility with gaskets and seals.
13Density
ASTM D1298
Baseline property; also identifies mixing of incompatible oils.
14Viscosity
ISO 3104ASTM D445
Affects convective cooling. A rise indicates oxidation.
15Colour
ASTM D1500ASTM D6045ISO 2049
Crude but immediate indicator of degradation, and useful for trending.

03What we test and repair

Diagnostics and site work

A laptop showing frequency-response traces, set on the open case of a test instrument on a transformer cover, with test leads running to the bushings — Sweep frequency response analysis run from the transformer cover, the traces on the laptop.

Electrical diagnostics

Performed on site, with results interpreted against the asset's own history where records exist.

Winding resistance · turns ratio (TTR), vector group and polarity · insulation resistance and polarisation index · tan delta and power factor of windings and bushings · sweep frequency response analysis (SFRA) to IEC 60076-18 · excitation current · short-circuit impedance · dielectric frequency response · partial discharge to IEC 60270, including acoustic and UHF methods · core insulation testing · thermography under load.

Two wound limbs of a transformer active part with their clamping structure and copper leads, standing on plastic sheeting outdoors, a tap-changer cylinder at the right — Windings, clamping and leads on an active part out of its tank.

Mechanical work

The work that determines whether a rehabilitation holds.

Bushing replacement in OIP, RIP and RIS types · Buchholz, pressure relief and rapid pressure rise device testing · winding and oil temperature indicator calibration · conservator and air-cell renewal · breather service and dehydrating breather retrofit · leak detection and sealing · gasket and radiator renewal · cooling fans, pumps and controls · tank cleaning and internal inspection · corrosion protection.

Tap changers

All work to IEC 60214.

On-load tap changer inspection, service and overhaul · contact and transition resistor assessment · diverter compartment oil treatment · dynamic resistance measurement · motor drive service · de-energised tap changer (DETC) service.

Drying

Moisture in paper is what limits the life of a transformer, and it is the hardest thing to remove.

On-site vacuum drying · hot-oil spray · low frequency heating (LFH), with documented before-and-after moisture assessment so the improvement is evidenced rather than asserted.

Monitoring and retrofit

Extending the useful life or the capacity of an asset already in service.

On-line DGA and bushing monitors · temperature and moisture sensors · SCADA integration · cooling upgrades for uprating · tap changer replacement · protection retrofits.

04What we take on

Transformer scope

Stated precisely. An overstated limit is a safety and liability problem, and buyers verify it.

Transformer scope
Attribute	Scope
Insulating fluid	Mineral oil, natural ester, synthetic ester and silicone
Dry type	Cast resin and VPI — inspection, cleaning and electrical testing. No oil work applies.
Manufacturers	Brand independent.

05Lista de equipamentos

Plant and equipment schedule

The plant and equipment schedule is a prequalification document, not a catalogue, and has its own page.

/capabilities/equipment#instruments
Test and diagnostic instruments
09Instrument categories
/capabilities/equipment#plant
Oil treatment, drying, power and lifting plant
08Plant categories
Written to be lifted straight into a prequalification pack, alongside the certificates and the personnel CVs. It prints.
How this plant reaches a site

Send us the test results

If you have DGA results, oil analysis or SFRA traces you want a second opinion on, send them. We will tell you what we read from them before any commercial conversation.

Discutir um programa Pedir o dossiê de pré-qualificação