## 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.

Megger-measuring-kit-TDM-4540-P-TD-PD

## What are dielectric losses?

Dielectric losses are caused by electromagnetic wave disturbances in dielectric materials manifested by increased electric field capacitance. Various types of electromagnetic wave reflection, attenuation or refraction are referred to as polarisation, which has a resonant nature. This means that waves, when stimulated to oscillate, demonstrate increase in the amplitude, being a forced form which, after some time, reaches equilibrium again, similarly to plucking of instrument strings. However, since the energy released requires increased activity, some devices may not be able to withstand this type of polarisation, which results in a loss of energy, which consequently dissipates.

Tangent delta dielectric loss factor measurement report

## 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.

Tangent delta dielectric loss factor measurement report

## Tangent delta dielectric loss factor measurements – GK-Elektro offering

GK-Elektro offers comprehensive power equipment servicing activities including control checks and periodical inspections, as well as power equipment installation, repairs and replacement. We cooperate with numerous partners including: Skanska, Solaris, Daimler Benz and Bridgestone. Our portfolio includes services provided for individual clients, corporations and companies in terms of required diagnostics and all operations necessary to rectify network malfunctions in offices, production floors and warehouses.

Measurement system during a tangent delta dielectric loss factor test