26_constant_monitoring rotating machines case studies.pdf

Monitoring in Electrical Rotating Machines - Case Studies

Conference on Electrical Power Equipment Diagnostics (CEPED)

Asia-Pacific Constant, CITRA

29-31 October 2013

PD Measurement

• WHAT? • WHY? • HOW?

What is Partial Discharge? According IEC 60270 partial discharge (PD) “localized electrical discharge that only partially bridges the insulation between conductors and which can or can not occur adjacent to a conductor”

Why do we measure PD? According IEC 60034-27-2: “For many years, the measurement of partial discharges (PD) has been employed as a sensitive means of assessing the quality of new insulation as well as a means of detecting localized sources of PD in used electrical winding insulation arising from operational stresses in service”

PD comes from different factors

TEAM stresses of the insulation: •Thermal, temperature •Electrical, electric field •Ambient (environment) •Mechanical, vibrations

How do we measure PD?

• Off-line measurement • On-line measurement

PLTA Cirata

PD Monitor

PD Sensor

Cirata Unit 7

PDM Data Cirata 7 Phase R

PDM Data Cirata 7 Phase S

PDM Data Cirata 7 Phase T

PD Analysis Tools

Cluster 1

Cluster 2

Cluster 3

Cluster 4

Cluster 5

Cluster 6 (Cluster 4)

Cluster 7

Stator Cirata Unit 7

Slot No. 7

Slot No. 44

Slot No. 80

Slot No. 99

Slot No. 234

Slot No. 252

T H A N K Y O U