Partial discharge testing
Partial discharges occur at faults in the cable, e.g. at electrical trees, joints and terminations. Partial discharge diagnostics is used to determine possible fault locations in cables and accessories before they lead to failure. This makes it possible to rectify the problem in a timely manner and prevent any subsequent damage resulting from uncontrolled failures. Partial discharge measurement is effected in accordance with standard IEC 60270.
Partial discharge measurement can detect the following:
- Faults in new and old cable accessories, such as incorrectly fitted joints
- Faults in the insulation of XLPE cables (e.g. electrical trees)
- Insufficient mass-impregnated paper insulation due to drying
- Mechanical damage to the cable sheath
PD signal superimposed with faults
Signal cleaned with filter
BAUR PD measuring devices can diagnose the following:
- PD localisation
- PD level
- PD inception voltage / extinction voltage
- PD frequency
- Phase-resolved PD presentation for every
- PD interference filter function
- Joint localisation
Combined presentation of location and PD assessment
Phase-resolved PD presentation (PRPD)
The phasing of partial discharges can be determined through state-of-the-art analysis methods. This makes it possible for you to assign the fault to diverse types of fault and to plan subsequent measurements as well as repair measures in a target-oriented and time- and cost-saving manner.
Phase resolving for a PD position
BAUR measurement methods for underground cables and accessories:
The dissipation factor measurement
(tan δ measurement)
Dissipation factor measurement is a non-destructive and integral procedure that serves to evaluate the condition of an entire cable route.
Online PD testing
With the help of liona, the portable BAUR online PD spot tester, cables can also be tested for partial discharges whilst live (online).
Monitored Withstand Test
The time-saving combination of testing and diagnostics is known as the Monitored Withstand Test (MWT).