Analysis transformer oil regulation

Analyzes of the dielectric oils of transformers are necessary and must be carried out periodically, to prevent possible incidents, the consequences of which are often very serious for the operation of the transformers.

These analyzes essentially allow:

Identify thermal / electrical faults in the transformer
To check the condition of the transformer insulation
To control the state of aging of the dielectric oil
To control the state of cellulosic insulators

The interest of oil analyzes:

Definitions of the most important oil analyzes:

Water content

Moisture, a significant amount in the oil, is an element that significantly degrades the insulation in transformers.

Acidity index

The measurement of the acid constituents of the oils defines the acid number of a dielectric oil. Acids have an impact on the degradation of cellulosic materials and can also be responsible for corrosion of the metal parts of a transformer. The acid number is an indicator of the aging state of a dielectric oil.

Reduced damage to transformers
Preventative removal of transformers avoids damage and unscheduled cuts
Avoid operating costs and expensive investments due to significant damage.
Maintenance program optimizations.

3-Tangent delta

The dissipation factor or power factor which is a dimensionless quantity is directly related to the resistivity and the permittivity in AC voltage of a dielectric fluid.

4-Dielectric strength

The breakdown voltage defines the ability of a dielectric oil to withstand electrical stresses.

5-Dissolved gas analysis

The main gases that are monitored in an operating transformer are:

H2 (hydrogen),
O2 (oxygen)
N2 (nitrogen),
CH4 (methane),
CO (carbon monoxide),
CO2 (carbon dioxide),
CO2 (carbon dioxide),
C2H4 (ethylene),
C2H6 (ethane),
C2H2 (acetylene).
The presence of these gases is the result of various electrical faults inside the power transformers.
Furan content

Furanic compounds are produced when the insulating properties of the paper degrade; by measuring the concentration of these compounds, an indication of the state of the paper-based insulation is obtained.