Figure. 5.4.4 - 179. Instant low command with two time-delayed windows.
The pick-up setting recommendation for the instant low function is equal to the the maximum allowed
overvoltage subtracted by the tap effect. This way there should not be situations where the voltage is
allowed to stay above the maximum allowed voltage for a long time. For example, if the maximum
allowed overvoltage is 10 % by local standards and the tap effect for the transformer is 1.67 %, the
pick-up for the instant low function should be set to 8.33 % (10 % – 1.67 %).
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Q-T215
-T215
Instruction manual
Version: 2.04
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