Electrical Engineering

OIL LEAK REPAIR OF TRANSFORMER

oil leak repair transformer

Main keywords are for this article: Oil leak repair transformer, Oil leak sealer

TOOLS AND MATERIALS

  • Replacement New Radiator with set of New Gasket.
  • Clean empty plastic drum.
  • Clean Plastic Flexible Hose
  • Drain Valve Fitting
  • Electric Oil Pump
  • NOT Materials for leak verification.

OIL LEAK REPAIR TRANSFORMER

GENERAL PREPARATORY WORKS

Manpower, equipment, tools and other logistics are ready and prepared for rectification.
Rectification of damaged radiator shall be in accordance with vendor procedures as stated in this article.

ISOLATION OF DAMAGED RADIATOR

  • Close the radiator butterfly/ shut-off valve (Upper & Lower) to isolate the oil volume within the radiator.
  • Full volume of oil in the radiator shall be drain out.
  • Loosening the responsible nuts and washers for the radiator flanges will set it free and ready for detachment.
  • With lifting equipment (crane), damaged radiator to be detached from transformer main tank.

INSTALLATION OF REPLACEMENT NEW RADIATOR

  • Installed the new radiator to the transformer with the lifting equipment.
  • Open the shut-off valve (oil from transformer tank to fill the space in the radiator).
  • Air to be bled out totally form the radiator through the upper fill plug until oil seeps out.
  • Filled oil (removed transformer oil from existing radiator) to the transformer main tank.

 

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TRANSFORMER OIL FILLING PROCEDURE

TRANSFORMER OIL

In this article we  are going to be discussed transformer oil, transformer oil testing, oil used in transformer, bdv of transformer oil. 

TRANSFORMER OIL FILLING PROCEDURE

Flushing and vacuum of transformer tank shall be performed as per manufacturer’s recommendations.
Heating and filtering of insulating transformer oil and filling shall be performed as per manufacturer’s recommendations.
Remove a sample of insulating transformer oil in accordance with ASTM D-923. Sample shall be tested for the following:
a) Dielectric breakdown voltage.
b) Acid neutralization number.
c) Specific gravity.
d) lnterfacial tension.
e) Color
f) Visual condition.
g) Water in insulation liquid.
h) Dissipation factor or power factor. ANSI/ IEEE C57.106
Remove a sample of insulating transformer oil in accordance with ASTM D-3613 and test shall be performed for dissolved gas analysis (DGA). ANSI/ IEEE C57.104 or ASTM D3612, NETA, ATS-Sec.7.2.2.2.11
Temperature devices shall be installed and verify setting and operation.
  • Cooling fans and pumps shall operate correctly and that fan and pump motors have correct over current protection, if applicable. NETA, ATS­Sec.7.2.2.1.11 .
  • Correct liquid level shall be verified in all tanks and bushings. NETA,  ATS-Sec.7.2.2.1.13.
  • Operation of all alarm, control, and trip circuits shall be verified from temperature and level indicators, pressure relief device, and fault pressure relay, if applicable. NET A, ATS-Sec. 7 .2.2.1.10 .
  • Transformer tank shall meet the Standard requirement of SAES-P-111, Sec. 9.
  • Insulation resistance test shall be performed before and after installation of surge arresters.
  • Surge arrester grounding shall be as per SAES-P-107, Sec. 11.3.
  • Cooling fans and pumps shall operate. (7.2.2.1.11) NETA, ATS­ Sec.7.2.2.3.3.1.2 .
  • Insulating transformer oil shall be tested for -Dielectric breakdown voltage, Water content, Acid neutralization number, Specific gravity, lnterfacial tension, Visual condition, Color, Power factor tests. NETA, ATS-Sec.7.2.2.2.10 and ANSI/ IEEE C57.106.

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