Post available to Premium Members only. Please upgrade your account in order to apply.
Transformer oil is mineral insulating oil derived from crude fossil fuel. it'sa combinationof assorted hydrocarbons. It consist partiallyacyclic compounds (open chain compounds) with the final formula CnH2n+2 and CnH2n.
Many oils additionally contain sure aromatic compounds (closed chain or ring compounds) associated withbenzol, hydrocarbon and derivatives of those with acyclic chains. smartelectrical device oil should insulate and forestall flash over of the exposed componentsinside the instrumentality and it should effectively remodelthe warmth from the core to the divergent surface.
The characteristics of latestelectrical device oil is given in IS 335/1983.
There is no single take a look atto evaluate all the qualities of the oil. everytake a look atis importantinside its limits and provides solely a general infoconcerning the conditions of the oil.
If the insulator strength is low, the oil is unfit to be usednotwithstandingthe other condition.
Transformer Oil Tests
The following ar to be tested to work out the qualities of electrical device oil,
insulator Dissipation issuetake a look at for Corrosive Sulphur in Oil
take a look at for oxidization Stability
Specific Resistance (Resistivity)
Sludge take a look at
Dissolved Gas Analysis (DGA)
Dielectric Strength take a look at
The electrical device oil underneathtake a look at is subjected to Associate in Nursing AC field with unendingly increasing voltage until the oil breaks down. The take a look at cell shall be of glass or plastic and clear and non-absorbent (Eg. alkyl group Methacrylate Vessel) with effective volume between three hundred to five hundredmetric capacity unit.
The electrodes should be Copper, Brass, Bronze or chrome steel and well polished having spherical form with dip twelve.5 millimetre to thirteenmillimetre. It shall have a spherical front as shown within the figure. The electrodes shall be mounted horizontally within the cell and therefore the axis shall be immersed at a depth of roughlyfortymillimetre, The conductor gap shall be two.5 ± 0.1 mm.