3. Standard protections
3.1 General
The protections are all of the definite time type, that is, a set point and time is selected.
If, for example, the function is over-voltage, the timer is activated if the set point is exceeded. If the voltage value falls below the set
point value before the timer runs out, the timer is stopped and reset.
Set point
Timer
start
Timer
reset
Timer
start
Time
Alarm
Measured value
Timer setting
When the timer runs out, the output is activated. The total delay will be the delay setting + the reaction time.
When configuring the parameters in the DEIF controller, the measuring class of the controller and an adequate "safety" margin must
be considered.
Example
A power generation system must not reconnect to a network when the voltage is 85 % of Un +/-0 % < U < 110 % +/-0 %. In order to
ensure reconnection within this interval, the controller's tolerance/accuracy (Class 1 of the measuring range) has to be taken into
consideration. It is recommended to set the range 1 to 2 % higher/lower than the actual set point, if the tolerance of the interval is
+/-0 %, to ensure that the power system does not reconnect outside the interval.
Phase-neutral voltage trip
If the voltage alarms must work based on phase-neutral measurements, adjust parameters 1201 (genset/mains/busbar A) and 1202
(busbar) accordingly. You can select whether phase-phase voltages, phase-neutral voltages, or phase-phase or phase-neutral
voltages are used.
Phase-neutral Phase-phase
U
L1-N
U
L
2
-
N
U
L
3
-
N
U
L3-L1
U
L1-L2
U
L2-L3
DESIGNER'S HANDBOOK 4189341275A EN Page 64 of 196
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