VAMP 265 - Page 61

Technical description
2 Protection functions
2.6 Current unbalance protection
I2>, I’2> (46)
VM265.EN011
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61
K
2
=
Pick-up setting I
2
> in pu. The maximum allowed
degree of unbalance.
Example:
K
1
=
15 s
I
2
=
22.9 % = 0.229 xI
N
K
2
=
5 % = 0.05 xI
N
4.300
05.0
1
229.0
15
2
2








t
The operation time in this example will be five minutes.
More stages (definite time delay only)
If more than one definite time delay stages are needed for
current unbalance protection, the freely programmable stages
can be used (chapter 2.12).
Setting groups
There are two settings groups available. Switching between
setting groups can be controlled by digital inputs, virtual
inputs (mimic display, communication, logic) and manually.
Figure 2.6-1. Inverse operation delay of current unbalance stage I
2
>. The
longest delay is limited to 1000 seconds (=16min 40s).