CYG PRS-7367 - Settings

Protection Functions
PRS-7367 47
The phase overcurrent protection can also be used in closed ring systems as short circuit
protection. This can be done in the closed ring networks and radial networks with the generation
connected to the remote end in the system thus giving fault current infeed in reverse direction.
Directional overcurrent IEDs are also used to have a selective protection scheme. In ring
connected supply feeders between substations or feeders with two feeding sources, 67P is also
used.
3.3.4 67P Settings
In the following table, i is the protection stage number, it can be set according to the requirements.
Table 3.3-3 67P settings
No.
Name
Values(Range)
Unit
Step
Default
Description
1
OC_Vol_Blk
10~120
V
0.01
100
Setting of blocking voltage
2
OC_NegVol_Blk
2-70
V
0.01
57
Setting of Negative voltage
3
OC_NegVol_Ena
0-1
-
1
0
Operation setting of Negative
voltage Enable/Disable
4
67Pi_Dir_Mod
0~2:
-
1
0
Stage 1 Directional mode:0~2 for
"Non-directional", "Forward" or
"Reverse"
5
67Pi_Cur_Str
0.04-20.00In
A
0.01In
0.04In
The Stage i Start current value
6
67Pi_RCA
-179 - 180
°
1
45
The Stage i Characteristic angle
7
67Pi_Mult_Cur_Str
0.8 - 10.0
-
0.1
1
The Stage i Multiplier for scaling
the start current value
8
67Pi_Curve_Type
0~5
-
1
0
0 Definite time
1 IEC Normal inverse
2 IEC Very inverse
3 IEC Extremely inverse
4 IEC Long-time inverse
5 Programmable user-defined
9
67Pi_Curve_ParaA
0.000~120.000
s
0.001
0
The Stage i Curve parameter A
10
67Pi_Curve_ParaB
0.000~9.000
s
0.001
0
The Stage i Curve parameter B
11
67Pi_Curve_ParaC
0.0~1.0
-
0.1
1.0
The Stage i Curve parameter C
12
67Pi_Curve_ParaP
0.02~2.00
-
0.01
2.00
The Stage i Curve parameter P
13
67Pi_Curve_ParaK
0.05-100
-
0.01
1.00
The Stage i Curve parameter k
14
67Pi_Min_Op_T
0.040-60.000
s
0.001
0.040
The Stage i minimum operating
time
15
67Pi_Reset_T
0.000 -60.000
s
0.001
0.02
The Stage i Reset time delay
16
67Pi_Ena
0-1
-
1
0
The Stage i Protection
enable/disable
17
67Pi_Vol_Blk_Ena
0-1
-
1
0
The Stage i Voltage setting
enable/disable
18
67Pi_Alm_Ena
0~1
-
1
0
The Stage i Alarm Enable/Disable
19
67Pi_Str_Ph_Num
1 out of 3
-
1
1
The Stage i Number of phases
required for operate activation