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118
Time delayed residual overcurrent protection
(TEF)
65°
IN>Dir
Figure 29:
Measuring characteristic of the directional element.
6.
To activate the directional function, set Direction = Directional.
7.
Set the polarising voltage to 2% of U
voltage and current to 65°.
8.
Check the operate current of the IMin function.
The function activates the TEF--START output.
9.
When independent time delay (definite) is selected, check the oper-
ate time of the t1 timer by injecting a current two times the set IMin
operate value.
When inverse time delay is selected, check the operate time at three
points of the inverse characteristic. The formulas for operate time for dif-
ferent types of inverse time delay curves are shown in
Verifying settings by secondary
Upol = -3U
ϕ
IN Operation
and the phase angle between
b
table
Chapter 13
injection
0
99000052.vsd
23.
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