CYG PRS-7367 - Page 64

Protection Functions
56 PRS-7367
function will be blocked, including the startup, trip and the timer will be reset; when if PTS_Blk=0
and the PTS Alm signal is 1, the VCE element and the Direction function will be valid, the 67G
function will become the Non directional earth fault.
&
67G_PTS_BlkSET
PTS_Open
FLG
SIG PTSAlm
&
67G_PTS_Blk
SET
PTS_Blk
FLG
SIG PTSAlm
Figure 3.5-4 PTS Alarm Open and Block Condition
 Initiation element
The initiation logic diagram is shown as below:
=0
=1
Set Value = 67G_Cur_Str
Set Value =67G_Cur_Str
*67G_Mult_Cur_Str
SIG 67G_Ena_Mult
&
67G_Ena=1SET
Io>Set ValueANA
Initiation
FLG
FLG
PTS_Blk
FLG Direction Initiation
FLG 67G_VCE_Str
FLG
PTS_Open
&
1
&
1
67G_CTBlkEna
SET
SIG CTS Alm
1
Figure 3.5-5 Initiation logic diagram
The measured zero sequence current is compared phase wise to the set 67G_Cur_Str. If the
measured value exceeds the set 67G_Cur_Str, the VCE and Directional condition are met, 67G is
initiation. If the 67G_Ena_Mult input is active, the 67G_Cur_Str setting is multiplied by the
67G_Mult_Cur_Str setting.
The start value multiplication is normally used in case that the inrush situation happens.
NOTICE!