High PD activity ...
... lead to uncovering a critical problem - the incorrectly installed wedges
Company: Midwest US Utility
Ratings: 173 MW, 18 kV, Hydrogen Cooled Turbine Generator, 3 years in operation
Manufacturer: Confidential
Related Info: 25 years old
PD Sensors: Two bus couplers per phase
Case Study Details:"... With the high H2 pressure (30-35 psig) the [PD] levels were expected to be very low but instead were very high after only a year of operation. We initially expected to find problems with the couplers as we did not believe the results..."
High PD activity (slot discharge)...
...was a foresign of an upcoming failure
Company: Western Canadian Utility
Ratings: 184 MVA, 13.8 kV, Air Cooled Hydro Generator
Manufacturer: Confidential
Related Info: 25 years old
PD Sensors: Four PDA Couplers per phase
Case Study Details: The PD data for this unit has been trended for over ten years. In 1995, semi-conducting paint and CRTV were injected into selected bars ...
Intelligent on-line signature analysis...
...revealed broken rotor bars
Company: A large utility in the US northeast
Ratings: 3000hp, 6.6kV 1785rpm Motor
Manufacturer: Confidential
Case Study Details: The suspicion arose from a constant hum during motor operation and abnormal vibration levels during start-up and running. The plant vibration monitoring system did not have the ability to zoom...
High level system PD noise...
...uncovered a well-developed tracking
Company: Italian utility
Ratings: 390 MW, 20kV, Hydrogen Cooled Turbine Generator
Manufacturer: Confidential
Related Info: Installed in 1970
PD Sensors: Two Bus Couplers per phase
Case Study Details: During a partial discharge measurement using the TGA-B portable instrument, high levels of PD activity (over 3000mV position, well above the highest range, see Figure 1) were detected on the C phase outside...
Reading Instability...
...uncovered internal bad connection on a new transformer
Company: US North-West utility
Ratings: 45 MVA power transformer
Manufacturer: Confidential
A customer was commissioning a new 45 MVA power transformer delivered by an overseas manufacturer. During the test, ADWEL's Digital Winding Resistance ReporteR, DWR-10, was consistently issuing a warning of current interruptions, and did not complete the test. Another DWR-10 instrument was used with similar outcome. All other standard measurements, including TTR, Tan-Delta and insulation resistance indicated acceptable resistance value.
Nevertheless, the customer drained the oil and inspected the transformer to detect that the windings on all 3 phases were not properly secured to the bushings. Had the transformer been energized, a catastrophic failure could have occurred.
Iris Power, the industry leader in on-line Partial Discharge Analysis (PDA) testing of generators & motors, announces the establishment of a new branch office in Beijing, China. The growing adoption of Iris s test and diagnostic products in the region necessitates a more responsive approach to the technical needs of users and commercial needs of our manufacturer's representative network. With this strategic expansion, Iris now has operations in Britain, the United States, India, and of course our head office in Toronto, Canada.
Dr. Greg Stone, VP Business Development at Iris Power L.P., has been elected effectiveJanuary 1, 2007 to a three-year term as one of the 15 members of the IEC Council Board.The Council Board serves as the board of directors for the IEC (International Electrotechnical Commission), which is the world s primary standards development bodyfor electrical and electronic products and systems.
IRIS Power, the industry leader in Partial Discharge Analysis (PDA) testing of generators & motors, following its merger with ADWEL International, has moved operations of both divisions to a new plant in the City of Mississauga, a suburb of Toronto, Ontario. The new address is...
Abstract submittal deadline
DECEMBER 16, 2008
Authors notified of acceptance
JANUARY 28, 2009
Paper submittal deadline
MARCH 29, 2008
Intercontinental New Orleans
444 St. Charles Ave.
New Orleans, LA 70130
Iris Power will be hosting the 12th annual Iris Rotating Machine Conference (IRMC) in May 2009, in New Orleans, Louisana. This annual conference is attended by industry professionals from around the world.
We invite you to submit your abstracts to Rebecca Christoforidis at rchristoforidis@irispower.com
*Authors will receive one complimentary conference registration per paper.
The 11th annual Iris Rotating Machine Conference was held this past June in Long Beach, California.
This year's conference boasted a significant international presence, with attendees from China, Japan, Denmark, Colombia, India, Austria, Australia, South Africa, and New Zealand.
In addition to the usual tutorials and user groups, this year we also held a workshop to demo some of our instruments. The workshop was a great success and the feedback very positive. There were also numerous technical papers on various aspects of maintenance, testing and monitoring of electrical apparatus from a vast and knowledgeable field of experts.
We would like to thank all of our attendees for making the 2008 IRMC a success. We look forward to seeing you next year in New Orleans.
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