IEC10000326-3.vsd
R
f
Trip
Alarm
OR
TripDelay
Adaptive
IEC10000326 V2 EN-US
Figure 233: STTIPHIZ alarm and trip logic
If the fault resistance R
f
is smaller than R
Alarm
and last longer than set alarm delay, output ALARM
is set. If the fault resistance R
f
is smaller than R
Trip
, output signal TRIP is set after the calculated
time. For trip time delay, see fig
231
7.14.9 Technical data
GUID-956187E5-A466-47BF-B671-F46548A5DF2E v3
Table 196: STTIPHIZ technical data
Function Range or value Accuracy
Fault resistance sensitivity Can be reached at steady
state operating condition
of the machine
50 kΩ
Typically 10 kΩ
Injection frequency (50.000 - 250.000) Hz ±0.1 Hz
Injection voltage 240 V
Trip limit of fault resistance (100 - 10000)Ω ±5% of 1 kΩ at R
f
≤ 1 kΩ
±10% of set value at R
f
> 1 kΩ
Alarm limit of fault resistance (100 - 100000)Ω ±5% of 1 kΩ at R
f
≤ 1 kΩ
±10% of 10 kΩ at 1 kΩ < R
f
≤ 10 kΩ
±50% of set value at R
f
> 10 kΩ
Trip time, start at R
f
~ 0Ω and filter
length = 1 s
1.00 s typically -
Trip time, trip at R
f
~ 0Ω and filter
length = 1 s
3.00 s typically -
Alarm time delay at R
f
~ 0Ω and
filter length = 1 s
(0.00 - 600.00) s ±0.2% or ± 2.00 s whichever is greater
Section 7 1MRK 502 066-UUS B
Impedance protection
432
Technical manual
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