Tangent delta factor measurements

Tangent delta dielectric loss factor measurements

Tangent delta dielectric loss measurements are conducted to assess the technical condition of cables, insulation systems and all kinds of transformers and other power equipment. Such diagnostic operations should be implemented periodically as part of control checks as well as operating and technical inspections aimed at determining and calibrating dielectric losses in cable and wire insulation. GK-Elektro performs measurements and diagnostic activities for electric system condition and provides services related to all kinds of repairs within power and telecom systems.

What is the tangent delta factor?

The dielectric loss factor is determined by the tangent delta (tg 5), i.e. amperage ratio of electric current components in a given dielectric material. Its determination involves mathematical calculations which, in the form of equations and numeric strings, define the angle of the phase shift between voltage and current. The “tg 5” factor is sometimes referred to as the dielectric loss angle tangent, i.e. the amperage ratio of the real and imaginary component. Tangent delta dielectric loss factor measurements are intended to determine a specific number of unwanted voltage discharges in a system.

What are tangent delta dielectric loss factor measurements?

Such energy losses occur very frequently. They are present in all electric systems, even new ones, seemingly being in a perfect condition. The objective of the tangent delta dielectric loss factor measurements is to determine the value of the polarisation vector which does not fully overlap with energy flowing through an electric conductor. As electric field fluctuations are frequent, some dielectric materials are characterised by a constant amount of polarisation or spontaneous occurrence of energy surges. Therefore, tangent delta dielectric loss factor determination visualises power network operation and characteristics, and facilitates detection polarisation causes.
The measurement is performed by connecting test leads to a system. The dielectric tangent delta factor test consists in examining voltage of a cable or device. Its results should be compared with manufacturer’s specifications for specific values and with previous test measurement results. It facilitates detecting possible deviations from the standard, and enables a user to check cables or equipment for correct operation and determine the degree of system ageing.