Binary Inputs; Alarm And Tripping Inputs; Figure 2.2-1 Example Of Transformer Alarm And Trip Wiring - Siemens 7PG2114 Application Manual

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7PG2113/4/5/6 Solkor Applications Guide

2.2

Binary Inputs

Each Binary Input (BI) can be programmed to operate one or more of the relay functions, LEDs or output relays.

These could be used to bring such digital signals as Inhibits for protection elements, the trip circuit supervision

status, autoreclose control signals etc. into the Relay.

2.2.1

A common use of binary inputs is to provide indication of alarm or fault conditions e.g. transformer Buchholz Gas

or Buchholz Surge conditions. The Binary Inputs are mapped to LED(s), waveform storage trigger and binary

outputs. Note that transformer outputs which require high speed tripping, such as a Buchholz Surge, should be

wired to a binary input to provide LED indication and also have a parallel connection wired to directly trip the

circuit via a blocking diode, see fig. 1.2-1:

Chapter 7 Page 15 of 49

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