ABB RELION REX640 Technical Manual page 1147

1MRS759142 C
REX640
Technical Manual
Table 1074: Communication scheme based on the Scheme type value
Scheme type value
"Intertrip"
"Permissive Underreach"
"Permissive Overreach"
"Blocking"
The unblocking scheme (DCUB) is enabled with the Unblock Mode setting.
Multiplexer
The multiplexer connects an input signal to an output based on the value of the Scheme
type setting.
Table 1075: Connected inputs based on the Scheme type value
Scheme type value
"Intertrip"
"Permissive Underreach" or "Permissive
Overreach"
"Blocking"
Direct underreaching transfer trip scheme DUTT
The direct intertrip scheme is enabled with Scheme type = "Intertrip".
In the direct intertrip scheme, the start signal from the underreaching zone Z1 is
connected to the CSUR input to create a carrier send CS_INTER_TR signal. The
duration of the CSUR input signal is prolonged by the Carrier Min Dur setting to
ensure a sufficient duration for the CS_INTER_TR signal.
The local circuit breaker is directly tripped (activation of the OPERATE output) with
the carrier received CR_INTER_TR signal after a settable pick-up delay
Coordination Time has elapsed without further local criteria.
The unblocking function (Unblock Mode = "Permanent" and Unblock
Mode = "Time window") must not be enabled with the DUTT scheme,
as the lost guard signal results in an immediate trip of the local circuit
breaker.
The activation of the BLOCK input totally blocks the direct intertrip scheme. The
CS_PRM and OPERATE outputs can be blocked by the BLK_CS_OPR input.
Protection related functions
Communication scheme
DUTT
PUTT
POTT
DCB
Inputs connected to an output
CR_INTER_TR
CR_PRM
CR_BLOCKING
Section 5
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