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VIMAP D.O.O.
Brace Jerkovic 137, 11000 Belgrade, Serbia tel.:+381 11 63 257 853, fax: +381 11 24 69 724
[email protected] www.vimap-technics.com
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Case study TRANSFORMER 7.5 MVA, 110/27.5 kV
TRANSFORMERS 7.5 MVA, 110/27.5 kV Manufacturer: Minel Ripanj, 1968. year, oil quantity: 9 t Serbian Railways, Electric-traction substations, Serbia
ON SITE POWER TRANSFORMERS INSULATION OIL REGENERATION/RECLAMATION
Oil regeneration in transformer was performed in off-line mode, according to the contractor request. Treatment lasted for ten days on each of transformers. Improvement of all oil characteristcs requested by contractor was obviously achieved.
INSULATION OIL CHARACTERISTICS
UNIT MARTINCI T2 INĐIJA T2 RESNIK T1 VODANJ T2
BEFORE AFTER BEFORE AFTER BEFORE AFTER BEFORE AFTER
Dielectric strength kV/cm 226 287 208 300 218 283 155 > 250
Interfacial tension mN/m 18.1 38.2 20 35.6 28.6 43.1 26.7 37.63
Neutralization number mgKOH/g 0.017 0.01 0.115 0.02 0.10 0.011 0.12 0.018
DDF, tgδ of oil(90°C) x 10-3 56.3 7.1 84.8 8.9 31 4.75 50.1 9.9
