Siemens SIPROTEC 7SD80 User Manual

Functions
2.10 Direct Local Trip
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
139
2.10 Direct Local Trip
Any signal from an external protection or monitoring device can be coupled into the signal processing of the
7SD80 by means of a binary input. This signal may be delayed, alarmed and routed to one or several output
relays. This signal can be delayed, alarmed and routed to one or several output relays.
2.10.1 Description
External Tripping of the Local Circuit Breaker
The external tripping can be switched on and off with a setting parameter and may be blocked via binary input.
The tripping logic of the device ensures that the conditions for the tripping logic are satisfied.
The phase currents and the ground current must exceed a configurable threshold to activate the tripping logic
of the device. The trip command can be delayed via a configurable time.
Figure 2-53 Logic diagram of the local external trip

Siemens SIPROTEC 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SD80
Category	Protection Device
Language	English