PD Applications - Rotating Machines
Testing laboratory
The quality of the stator winding insulation system should be verified according to the following brief description of the test procedure:
The test requires an AC power source capable of supplying a partial discharge (PD)-free 50 or 60 Hz variable voltage up to at least the rated line-to-ground voltage of the insulation system under test. PD measurements are then taken in voltage steps up to the rated line-to-ground voltage of the insulation system to measure the discharge inception voltage (DIV) and the discharge extinction voltage (DEV). The maximum PD magnitude at line-to-ground voltage should be less than 50 pC.
References:
IEEE 268-2000
"IEEE Recommended Practice for Measurement of Power Factor Tip-Up of Electric Machinery Stator Coil Insulation"
EN50209-1998
"Test of insulation of bars and coils of high-voltage machines"
IEC 60894-1987
"Guide for a test procedure for the measurement of loss tangent of coils and bars for machine windings"
Connection Diagram with ICMflex
Typical Packages:
1) Advanced PD measurement system
- 1 x ICMsystem (4 channels)
- 1 x ICMsystem software
- 1 x GPIB interface
- 2 x Preamplifier RPA1
- 1 x High frequency current transformer CT1 or CT100 (optional)
- 1 x Impulse calibrator CAL1B
- 1 x Set of cables
- 1 x Coupling capacitor, e. g. CC25B
2) Standard PD test system
- 1 x ICMcompact (opt. MUX4, gating)
- 1 x ICMcompact software
- 1 x Preamplifier RPA1
- 1 x Impulse calibrator CAL1B
- 1 x Set of cables
- 1 x Coupling capacitor, e. g. CC25B
3) Combined PD and TD measurement equipment
- 1 x ICMflex incl. software
- 1 x Impulse calibrator CAL1B
- 1 x Set of cables
