Date Code 990215 Trip and Target Logic 5-9
SEL-351P Manual Técnico
C
OMMUNICATIONS
-A
SSISTED
T
RIP
L
OGIC
–
G
ENERAL
O
VERVIEW
The SEL-351P includes communications-assisted tripping schemes that provide unit-protection
for transmission lines with the help of communications. No external coordination devices are
required.
Figure SECTION 5: .4: Communications-Assisted Tripping Scheme
Refer to
Figure SECTION 5: .4 and the top half of Figure SECTION 5: .1.
The six available tripping schemes are:
• Direct Transfer Trip (DTT)
• Direct Underreaching Transfer Trip (DUTT)
• Permissive Overreaching Transfer Trip (POTT)
• Permissive Underreaching Transfer Trip (PUTT)
• Directional Comparison Unblocking (DCUB)
• Directional Comparison Blocking (DCB)
Enable Setting ECOMM
The POTT, PUTT, DCUB, and DCB tripping schemes are enabled with enable setting ECOMM.
Setting choices are:
ECOMM = N (no communications-assisted trip scheme enabled)
ECOMM = POTT (POTT or PUTT scheme)
ECOMM = DCUB1 (DCUB scheme for two-terminal line [communications from one
remote terminal])
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