Iskra FPC 200 - Page 25

Functionality
USER MANUAL FPC 200 - 3/2017 25
2.2.3.3 Setting parameters
Parameter
Range
Description
Enabled
No
Yes
Enabling protection function.
Operate mode
Instantaneous
Definite time
IEC Normal inverse
IEC Very inverse
IEC Extremely inverse
IEC Long-time inverse
IEEE Moderately inverse
IEEE Very inverse
IEEE Extremely inverse
RI
Protection operation mode:
Definite time – constant time of operation
Inverse characteristics – selected IDMT characteristic
IDMT coefficient
0,05 … 1,00
Coefficient of selected IDMT characteristic
Pickup value
0,01 … 0,10 … 3,00 I
n_obj
Limit of monitored current.
Trip delay
0,00 … 1,50 … 300,00 s
Delay of trip signal.
Pickup delay
0 … 5,00 … 1000 ms
Time stabilization of fault detection. As a filter of short disturbances on
measuring circuits. Time before protection starts.
Drop-out delay
0,00 … 0,20 … 60,00 s
Time stabilization of pickup signal. Time when the monitored value is
outside the operating range, but the protection does not stop yet.
Drop-out ratio
0,80 … 0,95 … 1,00 I
p
Drop-out value below which the protection drops.
Pickup block
None
Variable 1
Variable 2
Variable 3
Variable 4
Source of blocking signal.
Minimal current
0,01 … 0,10 … 2,00 I
n_obj
Minimal current above which the protection operates. Protection is
blocked if all phase currents are below the set value.
Maximum current
0,10 … 4,00 … 10,00 I
n_obj
Maximum current below which the protection still operates. Protection is
blocked if any of the phase currents is above the set value.
Table 10: Negative/unbalance sequence protection function parameters.
2.2.3.4 Counters
Name
Description
Pickup
Total consecutive number of pickup signals.
Trip
Consecutive number of trip signals.
Table 11: Counters presented in negative sequence protection.