CYG PRS-7367 User Manual

Protection Functions
PRS-7367 215
Signal
Description
Block
This signal blocks all the binary output signals of the function
Blk_OpHS
This signal blocks of the instantaneous high stage operation
Blk_OpLS
This signal blocks of the Biased low stage operation
CT_Sta
CT saturation input
CT_Blk
CT block input
Table 3.46-2 Output signal
Signal
Description
Str
The start signal
Op
The operation signal.
Op_A
The operation signal of phase A
Op_B
The operation signal of phase B
Op_C
The operation signal of phase C
Op_HS
The operation signal of instantaneous high stage
Op_LS
The operation signal of biased low stage
Alm
The differential current off limit Alarm signal
Blkd
The all block signal
Blkd_A
The block signal of phase A
Blkd_B
The block signal of phase B
Blkd_C
The block signal of phase C
3.46.2 Differential Current Off Limit Alarm
If any differential current of the machines exceeds the [87MP_DIF_Idl] * [87MP_DIF_Ie] for 10
seconds, the device will report a differential current off limit alarm. When the differential protection
setting is disable, the differential current over limit alarm will disable.
87MP_DIF_EnableSET
SIG 87MP_Block
Ida>IdlANA
Idb>IdlANA
Idc>IdlANA
1
87MP_Alm
SIG
10s
&
&
Figure 3.46-2 The logic of differential current off limit alarm
3.46.3 Instantaneous high stage principle
Instantaneous high stage of differential protection quickly operates in case of severe internal
faults in the machine. The setting is set based on avoiding the maximum unbalanced current

CYG PRS-7367 Specifications

General

Brand	CYG
Model	PRS-7367
Category	Control Unit
Language	English