Breaker Intertrip And Remote Tripping; Functional Description - Siemens SIPROTEC Manual

Functions

2.4 Breaker Intertrip and Remote Tripping

2.4 Breaker Intertrip and Remote Tripping
7SD5 allows to transmit a trip 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, monitoring 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 circuit
The transmit signal can originate from two sources (Figure 2-33). If the parameter I-TRIP SEND is set to YES,
each trip command of the differential protection is immediately routed to the transmission function „Trp.sen L1"
to "...L3" (intertrip) and transmitted via the communication connections at the protection data interfaces.
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 functions „>Intertrip L1", „>Intertrip L2", and
„>Intertrip L3", or for all phases together (3-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.
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SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011