ABB RELION REX640 Technical Manual page 1239

1MRS759142 F
Table 1182: Connected inputs based on the Scheme type value
Scheme type value
"Intertrip"
"Permissive Underreach" or "Permissive Over-
reach"
"Blocking"
Direct underreaching transfer trip scheme DUTT
The direct intertrip scheme is enabled with
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
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 CS_INTER_TR signal after a settable pick-up delay
Time has elapsed without further local criteria.
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.
Bus A
~
Figure 704: Simplified functional diagram of the direct intertrip scheme
Permissive underreaching transfer trip scheme PUTT
The permissive underreach scheme is enabled with
Underreach".
REX640
Technical Manual
The unblocking function (
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.
Z1
3
CB_A
TRIP_CB_A
Protection related functions
Inputs connected to an output
CR_INTER_TR
CR_PRM
CR_BLOCKING
Scheme type = "Intertrip".
Carrier Min Dur setting to
Unblock Mode = "Permanent" and Unblock
CB_B
Z1
Z1_START
Scheme type = "Permissive
Coordination
Bus B
~
3
TRIP_CB_B
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