PD IEC/TS 60034-27-2:2012

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Nature of PD in rotating machines
5 Noise and disturbance
6 Measuring techniques and instruments
7 Installation of PD on-line measuring systems
8 Normalization of measurements
9 Measuring procedures
10 Visualization of measurements
11 Interpretation of on-line measurements
12 Test report
Annex A (informative) - Examples of Phase Resolved
        Partial Discharge (PRPD) pattern
Bibliography

Gives a common basis for: - measuring techniques and instruments; - the arrangement of the installation; - normalization and sensitivity assessment; - measuring procedures; - noise reduction; - the documentation of results; - the interpretation of results; with respect to partial discharge on-line measurements on the stator winding insulation of non-converter driven rotating electrical machines with rated voltage of 3 kV and up.

This part of IEC60034, which is a technical specification, provides a common basis for

• measuring techniques and instruments;

• the arrangement of the installation;

• normalization and sensitivity assessment;

• measuring procedures;

• noise reduction;

• the documentation of results;

• the interpretation of results;

with respect to partial discharge on-line measurements on the stator winding insulation of non-converter driven rotating electrical machines with rated voltage of 3kV and up. This technical specification covers PD measur ing systems and methods detecting electrical PD signals. The same measuring devices and procedures can also be used to detect electrical sparking and ar cing phenomena.

NOTE The main differences between on-line measurements and o ff-line measurements are due to a different voltage distribution along the winding and various thermal and mechanical effects related to the operation, like vibration, contact arcing or temperature gradients between stator copper and stator iron core. Furthermore, especially for hydrogen-cooled machines the gas and the gas pressure is different for off -and on-line PD measurements.