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10.
Device settings
10.6 Power frequency overvoltages according to EN 50550 - POP
Function
The DEHNrecord SD detects power frequency overvoltages as defined
in the EN 50550 standard.
In addition to the four voltage time windows specified by the
standard, a fifth detection criterion can be configured.
This can also be used to detect undervoltage.
Parameter for power frequency overvoltages according to EN 50550
Selectivity factor
This factor can be used to determine the time at which the digital out-
put is switched if "POP" is set as the source for it. By default, this is
set to 1, which corresponds to half of the voltage-time window minus
the switch-off time reserve.
Switch-off time reserve
This time serves as the reserve, which a potential protective device
requires from recording a trigger signal to switch off.
Parameter
Selectivity factor
Switch-off time reserve
Setting range
Default
0 ... 2
1
0 ... 0.13 s
0.02 s
U
400
350
300
270
IN 0
IN 1
OUT 0 /
LOGIC
function
OUT 1
IN 3
Voltage time window from EN 50550 within which a
internal
event
POP main protective device must trip.
Illustration of the selectivity factor a)
as well as the switch-off time reserve b).
U
in V
N
in V
N
a)
Page 43 from 69
t in s
b)
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