Areva MiCOM P441, Technical Manual

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Application Notes P44x/EN AP/E33
MiCOM P441/P442 & P444 Page 49/220
2.9.3.1 Inputs
Data Type Description
Activ_WI Configuration Weak infeed mode selection (Disable, Echo,
WI/echo)
Trip1P_WI Configuration Trip 1P in Weak infeed mode
Any Pole Dead Internal Logical Minimum 1 pole is open
Distance start Internal Logical Convergency of any impedance Loop – start of
distance
Reverse Internal Logical Fault detected in Reverse direction
FFUS_Confirmed Internal Logical Fuse Failure confirmed
Power swing Internal Logical Power swing detection
UNB_CR Internal Logical Carrier Received
VA<_WI Internal Logical Phase A selection by WI
VB<_WI Internal Logical Phase B selection by WI
VC<_WI Internal Logical Phase C selection by WI
CB52a_A, CB52a_B,
CB52a_C Internal Logical Dead Pole by phase A/B/C
(detected by interlocking contacts 52a/52b)
TtripWI Configuration Weak-Infeed Trip Timer
2.9.3.2 Outputs
Data Type Description
WI_CS Internal Logical Carrier Send (echo)
WI_TripA Internal Logical Trip Phase A by WI logic
WI_TripB Internal Logical Trip Phase A by WI logic
WI_TripC Internal Logical Trip Phase A by WI logic
2.9.4 Permissive Scheme Unblocking Logic
Two modes of unblocking logic are available for use with permissive schemes, (Blocking
schemes are excluded).
The unblocking logic creates the : "UNB_Alarm" and the : "UNB_CR" signals, which depend
upon:
•
Inputs signals [binary inputs: CR (Carrier Receive) COS (Carrier Out of Service)]
•
Settings used for the distance channel & DEF aided trip channel
•
Shared or independent logic between DEF & Distance
•
Carrier Out of Service detected
Different modes are selectable :
•
None (basic mode)
•
Loss of Guard mode
•
Loss of Carrier mode