By Topic

Field measurements of transformer single-phase exciting current as a diagnostic tool, and influence of load tap changers

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Lachman, M.F. ; Doble Eng. Co., Watertown, MA, USA

The single-phase exciting-current test can be used to detect undesirable conditions in single- and three-phase transformers. Normally the test results are analyzed by comparing currents between all three phases in a given transformer and between similar single-phase units. Certain problems, however, can be detected on the basis of current change when the measurements are performed on different load tap changer positions. Accordingly, understanding how the load tap changer affects the current magnitude of individual phases is essential for developing proper analysis. This paper identifies twelve patterns of test result behavior, and an attempt is made to show different load tap changer designs as they affect the measurement. The test results and test circuit diagrams are given. The derived patterns will be implemented in a DOS-based expert system in combination with a data acquisition system which is currently used in the field by more than 80 utilities

Published in:

Power Delivery, IEEE Transactions on  (Volume:9 ,  Issue: 3 )