Pickup1
PU_ST1
TRST1
tReset1
t1
ANSI10000040-3-en.vsd
ANSI10000040 V3 EN
Figure 253: Example for Definite Time Delay stage1 operation
8.1.2.3 Blocking
It is possible to block Two step undervoltage protection UV2PTUV (27) partially or
completely, by binary input signals or by parameter settings, where:
BLOCK:
blocks all outputs
BLKTR1: blocks all trip outputs of step 1
BLK1: blocks all pickup and trip outputs related to step 1
BLKTR2: blocks all trip outputs of step 2
BLK2: blocks all pickup and trip outputs related to step 2
If the measured voltage level decreases below the setting of IntBlkStVal1, either the
trip output of step 1, or both the trip and the PICKUP outputs of step 1, are blocked.
The characteristic of the blocking is set by the IntBlkSel1 parameter. This internal
blocking can also be set to Disabled resulting in no voltage based blocking.
Corresponding settings and functionality are valid also for step 2.
In case of disconnection of the high voltage component the measured voltage will get
very low. The event will PICKUP both the under voltage function and the blocking
function, as seen in figure
254. The delay of the blocking function must be set less than
the time delay of under voltage function.
Section 8 1MRK505222-UUS C
Voltage protection
498
Technical reference manual
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