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Equation 3.8 – RXIDG
=
5 −
t
8 .
. 1
35
ln
RXIDG
I k
t
=
Operation delay in seconds
k
=
User's multiplier
I
=
Measured value
I
=
User's pick up setting
pickup
Example for Delay type RI :
k
=
0.50
I
=
4 pu
I
=
2 pu
pickup
0
5 .
=
=
t
RI
. 0
236
−
. 0
339
⎛
⎞
4
⎜
⎟
⎝
⎠
2
The operation time in this example will be 2.3 seconds. The same
result can be read from Figure 3.54.
Example for Delay type RXIDG:
k
=
0.50
I
=
4 pu
I
=
2 pu
pickup
=
−
t
5
8 .
. 1
35
ln
RXIDG
0
The operation time in this example will be 3.9 seconds. The same
result can be read from Figure 3.55.
Protection Functions
I
pickup
2
3 .
4
=
3
9 .
⋅
5 .
2
3-89
857-UM001A-EN-P – July 2009
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