29-30) or an FT switch finger can supply a binary input which in turn is configured to
the TESTMODE function block.
Each of the functions includes the blocking from the TESTMODE function block. A
typical example from the undervoltage function is shown in figure
33.
The functions can also be blocked from sending events over IEC 61850 station bus to
prevent filling station and SCADA databases with test events, for example during a
maintenance test.
Time
V
Normal voltage
Pickup1
Pickup2
IntBlkStVal1
IntBlkStVal2
Disconnection
tBlkUV1 <
t1,t1Min
tBlkUV2 <
t2,t2Min
Block step 1
Block step 2
en05000466_ansi.vsd
ANSI05000466 V1 EN
Figure 33: Example of blocking the time delayed undervoltage protection function.
1MRK505222-UUS C Section 4
Basic IED functions
101
Technical reference manual
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