CHAPTER 7: COMMISSIONING AUXILIARY PROTECTION AND MONITORING FUNCTIONS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–59
7.6.3.2 Operating Time
Using the setup in Frequency element testing on page 7–44 with the interval timer enabled,
Set the current level to 1.5 times the operate level of the element and
apply suddenly by closing the double pole switch.
Record the operate time and compare to the
S4 ELEMENTS
XFORMER OVERLOAD
TRANSFORMER OVERLOAD DELAY setting.
Note
The blocking from logic input, if enabled, can be tested as described in earlier tests for
other elements.
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