CYG PRS-7367 - Positive sequence under voltage protection 27 P

Protection Functions
98 PRS-7367
blocking value
7
27_i_Str_Ph_Num
1
1
1 out of 3
8
2
2 out of 3
9
3
3 out of 3
10
27_i_Vol_Select
1
2
Phase voltage
11
2
Phase to phase
voltage
12
27_i_Dudt_Blk_Ena
0-1
-
1
1
The voltage-slip
block criterion
disable/enable
13
27_i_Dudt_Blk
0-20
V/s
0.01
20
The voltage-slip
block setting
value
3.16 Positive sequence under voltage protection 27P
3.16.1 27P Overview
This relay provides a one-stage positive sequence under voltage protection with definite time
delay characteristics.
3.16.1.1 Function Block
The function block of the protection is as below.
U3P
27P
Blk
Blk_Op
Blk_Str
Str
Op
Figure 3.16-1 Function block
3.16.1.2 Signals
Table 3.16-1 Input Signals
Signal
Description
U3P
The voltage magnitude in all the three phases
Blk
This signal blocks all the binary output signals of the function
Blk_Str
This signal blocks all the start outputs of the function
Blk_Op
This signal blocks all the trip signals of the function.