ABB RELION RET670 Applications Manual page 744

Section 15
Control
738
Signal
S1DC_OP All disconnectors on bus-section 1 are open.
S2DC_OP All disconnectors on bus-section 2 are open.
VPS1_DC The switch status of disconnectors on bus-section 1 is valid.
VPS2_DC The switch status of disconnectors on bus-section 2 is valid.
EXDU_BB No transmission error from any bay that contains the above information.
These signals from each line bay (ABC_LINE), each transformer bay (AB_TRAFO),
and each bus-coupler bay (ABC_BC) are needed:
Signal
189OPTR 189 is open.
289OPTR 289 is open (AB_TRAFO, ABC_LINE).
22089OTR 289 and 2089 are open (ABC_BC).
VP189TR The switch status of 189 is valid.
VP289TR The switch status of 289 is valid.
V22089TR The switch status of 289 and 2089 are valid.
EXDU_BB No transmission error from the bay that contains the above information.
If there is an additional bus-section disconnector, the signal from the bus-section
disconnector bay (A1A2_DC) must be used:
Signal
DCOPTR The bus-section disconnector is open.
VPDCTR The switch status of bus-section disconnector DC is valid.
EXDU_DC No transmission error from the bay that contains the above information.
If there is an additional bus-section circuit breaker rather than an additional bus-section
disconnector the signals from the bus-section, circuit-breaker bay (A1A2_BS) rather
than the bus-section disconnector bay (A1A2_DC) must be used:
Signal
189OPTR 189 is open.
289OPTR 289 is open.
VP189TR The switch status of 189 is valid.
VP289TR The switch status of 289 is valid.
EXDU_BS No transmission error from the bay BS (bus-section coupler bay) that contains the
above information.
1MRK 504 163-UUS A
Transformer protection RET670 2.2 ANSI
Application manual