Transformer overload characteristics---Bubble evolution
Project RP1289-3 explores significant parameters affecting bubble evolution from transformer oil under high temperature operating conditions to address the question: Does ''real life'' operation of a transformer cause harmful bubbling conditions. Studies outlined in the project are designed to determine when bubbling occurs in transformers and if bubbling can be harmful during the normal operation of these transformers. Data obtained from these studies should provide a basis for utilities to perform risk assessments in relation to their loading practices. The program is designed to demonstrate those conditions under which bubbling occurs in transformers by using controlled models and actual signal phase transformers that were designed to give access to both high and low voltage windings for the purpose of viewing bubble generation. Results and observations from tests on the full-size transformers, thermal models, and electrical models have led to the conclusion that bubbles can occur under operating conditions. The electrical models show that dielectric strength can be reduced by as much as 40 percent due to the presence of bubbles. Because of factory safety considerations, the transformers could not be tested at hot spot temperatures greater than 140/degree/C. Therefore, there is no information on the dielectric strength of the full-size transformers under bubbling conditions. 4 refs., 28 figs., 45 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Westinghouse Electric Corp., Sharon, PA (USA). Materials Mfg. Technology Dept.
- OSTI ID:
- 7119902
- Report Number(s):
- EPRI-EL-5999; ON: TI88016611
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
24 POWER TRANSMISSION AND DISTRIBUTION
INSULATING OILS
BUBBLE GROWTH
TRANSFORMERS
FUNCTIONAL MODELS
DESIGN
DIELECTRIC MATERIALS
ELECTRICAL INSULATORS
NUMERICAL DATA
PROGRESS REPORT
TESTING
DATA
DOCUMENT TYPES
ELECTRICAL EQUIPMENT
EQUIPMENT
INFORMATION
MATERIALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
200104* - Fossil-Fueled Power Plants- Components
200301 - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)