CYG PRS-7367 User Manual

Protection Functions
PRS-7367 133
NO
Name
Values(Range)
Unit
Step
Defa
ult
Description
13
25SYN_Vol_Diff
0.01~110.00
V
0.01
10
Voltage difference limit of
synchronism check for 79AR
14
25SYN_Fr_Diff
0.00~5.00
Hz
0.01
0.2
Frequency difference limit of
synchronism check for 79AR
15
25SYN_T_DdChk
0.01~20.00
s
0.01
1
Time delay to confirm dead check
condition
16
25SYN_T_SynChk
0.01~20.00
s
0.01
1
Time delay to confirm synchronism
check condition
17
25SYN_SynPhs
0~5
1
0
0:Ua: A-phase voltage
1:Ub: B-phase voltage
2:Uc: C-phase voltage
3:Uab: AB-phase voltage
4:Ubc: BC-phase voltage
5:Uca: CA-phase voltage
3.24 Current unbalance protection 51NA
3.24.1 51NA Overview
The current unbalance protection for shunt capacitor banks function 51NA is used to protect the
Double-Y-connected capacitor banks from internal faults. 51NA is suitable for the protection of
internally fused, externally fused and fuse less applications. 51NA can be enabled or disabled and
it starts when the measured unbalance current exceeds the current startup setting. The operation
time characteristics can be selected to be either definite time (DT) or inverse definite minimum
time (IDMT).
3.24.1.1 Function Block
The function block of the protection is as below.
I3P
51 NA
Blk
BlkStr
BlkOp
Str
Op
EnaMult
Figure 3.24-1 Function block

CYG PRS-7367 Specifications

General

Brand	CYG
Model	PRS-7367
Category	Control Unit
Language	English