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TRANSFORMER OIL AND FILTRATION SPECIALISTS   Over 20 years field experience in the design and operation Of high voltage transformer oil reclamation equipment   Energy Services Group is a provider to the electrical industry in Australia, New Zealand,  Pacific and South East Asia. Specialising in Vacuum Filling of New and re-commissioned Transformers including draining of oil before service work and storage of oil. On-line Oil Reclamation and Transformer De-sludging On-line Transformer Dry-outs Transformer Dryout PCB Oil Removal, De-chlorination and Recycling of Transformer Oil PCB Removal & Decontamination of Solid waste (e.g. Soil, Transformers etc) Sales of New Transformer Oil Sales of Recycled Transformer Oil including oil exchange. Oil pick up and delivery by tanker, ISO tanks, Pods and/or Drums Oil Sampling and Diagnostic Services Manufacturer, distributor and installer of filtration systems Tap Changer Filter Systems Portable Trolley Filter Systems Transformer Vacuum Dryout/Degasser Systems (up to 10,000 litres per hour) ·         Hiring of filtration Systems Supplier of Velcon Oil utility Products Substation monitoring, maintenance and reporting

Transformer Life

What keeps your Transformer going? Paper Mechanical strength Dielectric strength Dielectric spacing Oil Dielectric strength Cooling Protects the paper But Oil oxidies and creates oxidation by-products which in turn destroy the paper. To maximise the life of the paper insulation, oxidation of the oil must be controlled.

Acidity trigger points (NN=Neutralisation number) -SD MYERS NN=0.05 TO 0.1 -TRANSGRID (NSW AUST) NN=0.1 TO 0.2 -OVERSEAS PRACTICE IS TOWARDS NN=0.1

FACT: Oil at acidity (NN)=0.2 will not hold oxidation by-products (sluge) in suspension. HENCE: Must keep NN <0.2 to avoid depositing SLUDGE FACT: Damage to paper insulation cannot be repaired Slude formation - deposit initially in cooler arears eg radiators and conservators - initial deposits are invisible - build-up, unless oil codition is corrected, is exponential Degradation of transformer insulation is combination of three main factors: Moisture - oil leaks (very important!) - faulty breathing - low loading "MOISTURE KILLS TRANSFORMERS" Temperature - Max. top oil=60 deg C - Every 4-6 deg C above 60 deg C halves the remaining paper life Oil oxidation - is a chemical process which must and can (readily) be kept in check

Water in Transformer Introduction: Those responsible for transformer maintenance generally recognize that water in transformers is a problem. However, the relationship of water to oil and cellulose is less understood, as is the impact of water on cellulose, over an extended period of time. MOISTURE 4% DRY WEIGHT PAPER= ENTERING RISK ZONE 5-6% DRY WEIGHT PAPER = CONSIDERABLE RISK 7% DRY WEIGHT PAPER= FAILURE IMMINENT MOISTURE KILLS TRANSFORMERS Oil Leaks: It is very important to recognise the significance of an oil leak. Oil loss is consequential but on the cooling down cycle moisture drawn in. Faulty breathing: A ready source of moisture Low Loading: When a transformer is left "sitting around" or is very lightly loaded it will become wet

Acidity 0.1=65% Residual paper tensile strength 0.25=50% Residual paper tensile strength End of life definition A loss of the initial tensile strength of the cellulosic insulation is now the accepted "end of life" criteria. Loss of life definition Loss of mechanical or electrical strength when paper is neglected can never be regained. Thermal life of paper The thermal life of class 105 insulation (eg 65C rise design) is halved for each increase of 8 deg C or conversely, doubled for each decrease of 8 deg C.

Last Updated November 2007