The dissipation factor measurement
(tan δ measurement)
The dissipation factor measurement (tan δ measurement) is a non-destructive and integral procedure that serves to evaluate the condition of an entire cable route. With the dielectric dissipation factor tan δ, the relation of effective power to reactive power of the cable is measured. The measurement provides clear information on the condition of the cable insulation and its ageing.
Sequence for tan δ diagnostics
The tan δ measurement is performed over several voltage steps that can be adjusted in our devices. With aged cables, a characteristic increase in dissipation factor can be seen with increasing measurement voltage. A classification of the cables is possible, which proves highly valuable when planning the maintenance measures.
With the dissipation factor measurement you will discover
- Areas in the insulation of XLPE cables that are damaged by water (water trees), which later lead to electrical trees and represent the natural cause of a cable fault
- Faults in the insulation of paper-insulated mass-impregnated cables due to drying or insufficient insulation of paper-insulated mass-impregnated cables due to moisture
- Moisture in accessories (joints/terminations)
- Possible partial discharges
- Possible ageing effects in cable routes
Dissipation factor measurement with the BAUR Software 4
Illustration of dissipation factor measurement in the BAUR Software 4:
Illustration of dissipation factor measurement in the report