Partial Discharge Analysis

Partial discharge (PD) occurs in the stator insulation system of rotating machines, where local electric field stress exceeds the local electrical strength. Compared with other dielectric tests, the differentiating character of partial discharge measurements allows localized weak points of the insulation to be identified.

PD measurements based on IEC 60034-27 standards can be performed on motors and generators either on-line during regular load service operation or off-line by energizing each winding successively during standstill of the machine.

Generally, several different partial discharge sources are present and active within the stator winding insulation at the same time. The key to successful PD measuring in stator windings is the separation of parallel active PD sources and the distinction between harmful PD, normal PD occurrences and outer noise, inevitably present in industrial surroundings.

This is best achieved by synchronous, multi-channel partial discharge measurement. This separates internal PD sources from each other and from noise signals.  PD sources are evaluated individually within the stator winding.

Recommended solutions for partial discharge analysis on generators and motors

MPD 600

For high-end measuring and analysis needs

MPD 500

For routine and acceptance tests

CPC 100 + CP TD1 + CP CR500

High-voltage source for partial discharge measurements and withstand tests