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Regeneração de Óleo Isolante

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Substation Services

Single-phase and three-phase oil filled power transformers/ autotransformers/shunt reactors/mobile Substations (on-site services) up to 745kV:

• Dress and test

• Unit disassembly and accessories packing

• Unit transportation between customer installations

• Oil handling

• Oil treatment

• Oil fi ltering and degassing

• Bushings maintenance or replacement

• Control box maintenance or replacement

• Oil leaks repair (tank welding and re-gasket)

• Metallic surfaces treatment (new paint or paint retouch)

• External accessories maintenance or replacement (oil level gauge, rapid pressure rise relay, Buchholz relay, pressure relief device, thermometers and other accessories)

• Old conservator replacement by new one equipped with rubber cell and oil level gauge

mod. CS404I1801A1

Efacec USA, Inc.2725 Northwoods Parkway, suite B l Norcross, GA 30071 l phone: +1 (770) 446-8920 | e-mail: usa.servicing@efacec.com | web: www.efacec.com Du

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Low voltage tests core and windings

• Insulation resistance;

• Windings resistance;

• Transformer turn ratio;

• Power factor, excitation, leakage reactance and capacitance (Doble) on transformers, bushings and surge arresters;

• SFRA and DFR transformer tests;

• CT ratio, polarity, saturation and winding resistance;

• Oil and hot-spot winding thermometer calibration;

• Control cabinet operation checks on Buchholz relay, OLRC relay, rapid pressure rise relay, OLTC, DETC, etc;

• Input current on motors (fan, pump, OLTC and DETC driving mechanism).

Oil tests

• Dissolved gas analysis;

• Physical-chemical (water content, breakdown, IFT, etc.);

• 2-FAL;

• Corrosive sulfur.

Installation of monitoring system

Diagnostics and corrective actions

Maintenance management (technical and economical)

Risk assessment

Transformer failures forensic analyses

Testing