Generator and motor stator monitoring based on partial discharge quadratic rate measurement

Audoli, A.; Drommi, Jean-Louis

doi:10.1109/elinsl.1992.246976

Cited by 13 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In both cases the changes in behavior can be explained in terms of aging effects at the discharge site [54,58]. [60]. Similar to the results as shown in Figures 12 and 13 the explanation of these changes can be found in the physical changes of the dielectric surface.…”

Section: P91-supporting

confidence: 74%

Digital analysis of partial discharges

Gulski

1995

IEEE Trans. Dielect. Electr. Insul.

158

View full text Add to dashboard Cite

show abstract

Section: P91-supporting

confidence: 74%

Digital analysis of partial discharges

Gulski

1995

IEEE Trans. Dielect. Electr. Insul.

158

View full text Add to dashboard Cite

show abstract

In-service evaluation of motor and generator stator windings using partial discharge tests

Stone

Sedding

1995

IEEE Trans. on Ind. Applicat.

View full text Add to dashboard Cite

Practical on-line partial discharge tests for turbine generators and motors

Campbell

Stone

Sedding

et al. 1994

IEEE Trans. On energy Conversion

View full text Add to dashboard Cite

Several utilities have found partial discharge testing to be very usejkl for identifying motors or generators with deteriorated stator winding insulation. Such partial discharge tests are sensitive to problems associated with overheated insulation, loose stator bars, and pollution, all of which can cause in-service failures with long associated outages and high repairlrewind costs. Unfortunately. the partial discharge test k not widely applied since present test methods require considerable skill to perform, andlor require machine outages. These problems are due to the stator winding partial discharges being masked by high levels of internal and external electrical noise. Partial discharge tests have now been developed which eliminate the Uect of noise, thus allowing plant personnel to perform the test without any machine outage. Two broad types of noise exist: arcing from slip rings, shaft grounding brushes, etc. within the machine (internal noise): and arcing and partial discharge from the bus connecting the machine to the power system (external noise). Installations on several machines have shown that external noise can be eliminated by a pair of capacitive couplers (bus couplers) mounted on each phase of the output bus. Sensors which are mounted within the slots of the stator winding (SSCs) have been shown to eliminate both external and internal noise. An instrument called the TGA has been developed to measure the signals from either type of sensor, distinguish noise from stator winding pam'al discharge, and perform a pulse height, pulse phase analysis on the partial discharge signals. Using the TGA, deteriorated windings have been found to have as much as 20 times higher partial discharge activity than good windings. The SSC type of sensor is best for use on large turbine generators or other critical machines, due to its ability to Uectively eliminate false indications of deteriorated windings.

show abstract

Generator and motor stator monitoring based on partial discharge quadratic rate measurement

Cited by 13 publications

References 2 publications

Digital analysis of partial discharges

Digital analysis of partial discharges

In-service evaluation of motor and generator stator windings using partial discharge tests

Practical on-line partial discharge tests for turbine generators and motors

Contact Info

Product

Resources

About