Breaker Intertrip And Remote Tripping; Functional Description - Siemens siprotec 7SD5 User Manual

2 Functions
2.4

Breaker Intertrip and Remote Tripping

7SD5 allows to transmit a tripping command created by the local differential protection
to the other end or ends of the protected object (intertripping). Likewise, any desired
command of another internal protection function or of an external protection, monitor-
ing or control equipment can be transmitted for remote tripping.
The reaction when such a command is received can be set individually for each
device. Thus, selection can be made for which end(s) the intertrip command should
be effective.
Commands are transmitted separately for each phase, so that a simultaneous single-
pole auto-reclosure is always possible, provided that devices and circuit breakers are
designed for single-pole tripping.
2.4.1

Functional Description

Transmission The transmission signal can originate from two different sources (Figure 2-25). If the
parameter I-TRIP SEND is set to YES, each tripping command of the differential pro-
Circuit
tection is routed immediately to the transmission function „I-Trip SendL1" to "...L3" (in-
tertrip) and transmitted via the protection data interfaces and communication links.
Furthermore, it is possible to trigger the transmission function via binary inputs
(remote tripping). This can be done either separately for each phase via the input func-
tions „>Intertrip L1", „>Intertrip L2" and„>Intertrip L3", or for all
phases together (three-pole) via the binary input function „>Intertrip 3pol". The
transmission signal can be delayed with T-ITRIP BI and prolonged with T-ITRIP
PROL BI.
Figure 2-25 Logic diagram of the intertrip — transmission circuit
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7SD5 Manual
C53000-G1176-C169-1