doble SFRA, User Manual, Page: 99 / 126

72A-2570-01 Rev. K 07/2011 B-1
B. Test Templates
This appendix provides complete details for the test templates included with
SFRA 5.2. It contains the following sections:
• “Introduction” on page B-1
• “Notes About the Test Templates” on page B-1
• “Two-Winding Transformers” on page B-2
• “Autotransformers” on page B-3
• “Three-Winding Transformers” on page B-4
Introduction
The test templates given here require the performance of open-circuit and
short-circuit tests.
A standard set of tests, recorded when a baseline is needed and there is no
question of the transformer’s health, consists of a set of results taken only at
extreme tap position. Doble recommends that the LTC be in the extreme raise
position. However, if the transformer is being tested for post-event reasons,
such as fault, this should be done in the as-found LTC position. Note the tap
positions on the test report and apply them during the start of each test.
Doble recommends leaving the DETC in the as-found position. The DETC
position should not be moved for an SFRA test until all options are exhausted.
For new transformers in the factory, use the nominal DETC position, unless
otherwise specified by the end-user.
Notes About the Test Templates
Keep the following information in mind as you refer to the test templates:
• Leads . Each table gives the recommended tests with the position of
the red lead and black lead clearly identified. Reversing these test
leads may provide small variations in higher-frequency response.
Therefore, take care to attach test leads appropriately.