Abstract:
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 com...Show MoreMetadata
First Page of the Article
Abstract:
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: IEEE Transactions on Power Delivery ( Volume: 9, Issue: 3, July 1994)
DOI: 10.1109/61.311223
First Page of the Article
Citations are not available for this document.
Cites in Patents (2)Patent Links Provided by 1790 Analytics
1.
Lachman, Mark F., "System and method for performing transformer diagnostics"
Inventors:
Lachman, Mark F.
Abstract:
A method for performing diagnostics on a target transformer includes applying a voltage output of a voltage generator to a winding or phase of the target transformer; controlling the voltage generator to output an AC voltage at a first frequency and then a second frequency and measuring first and second excitation currents flowing into the target transformer associated with the first frequency and second frequency, respectively. The method further includes determining an actual excitation current of the target transformer as a function of both the first and second excitation currents, and comparing the actual excitation current of the target transformer to excitation currents associated with one or more benchmark transformers having known electrical characteristics. And when the actual excitation current of the target transformer matches an excitation current of one of benchmark transformers, determining the electrical characteristics of the target transformer to match electrical characteristics of the one benchmark transformer.
Assignee:
DOBLE ENGINEERING CO
Filing Date:
29 January 2019
Grant Date:
28 January 2020
Patent Classes:
Current International Class:
G01R0310200000, G01R0310600000, G01R0313600000, G01R0292000000, G01R0292200000, G01R0292600000, G06F0190000000
2.
Lachman, Mark F., "System and method for performing transformer diagnostics"
Inventors:
Lachman, Mark F.
Abstract:
A method for performing diagnostics on a target transformer includes applying a voltage output of a voltage generator to a winding or phase of the target transformer; controlling the voltage generator to output an AC voltage at a first frequency and then a second frequency and measuring first and second excitation currents flowing into the target transformer associated with the first frequency and second frequency, respectively. The method further includes determining an actual excitation current of the target transformer as a function of both the first and second excitation currents, and comparing the actual excitation current of the target transformer to excitation currents associated with one or more benchmark transformers having known electrical characteristics. And when the actual excitation current of the target transformer matches an excitation current of one of benchmark transformers, determining the electrical characteristics of the target transformer to match electrical characteristics of the one benchmark transformer.
Assignee:
DOBLE ENGINEERING CO
Filing Date:
17 February 2017
Grant Date:
12 February 2019
Patent Classes:
Current International Class:
G01R0310200000, G01R0310600000, G01R0313600000, G01R0292000000, G01R0292200000, G01R0292600000, G06F0190000000
