Teleprotection Interface G4Ai; Summary; Inputs; Solid State Outputs - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
3.3.2.

Teleprotection interface G4AI

3.3.2.1.

Summary

The teleprotection interface includes:
•
four input circuits equipped with optocouplers,
•
four output circuits equipped with semiconductors (referred to as

'solid state outputs'),

•
two electro-mechanical output relays with change-over contacts
(referred to as 'relay outputs').
All inputs and outputs are potential-free and galvanically isolated from
ground and all other circuits.
The allocation of functions for each of these circuits or relays is
programmed with the help of the user interface HMI600 (e.g.
command input or a start input, command output or alarm output).
Safety is the most important factor considered in the design of this
module. For example, there are screening plates mounted on both the
soldered and the component side. The internal signals are connected
to the TDM-bus via C–type-plug of the module. The external signals
are connected via F–type-plug to the external cable.
The input and the output circuits are protected against overvoltage and
inverse polarity.
The in-service status of the module is indicated through the ready–
LED 'RDY'. Separate LEDs indicate the active status of each input,
solid state output and relay output.
The various circuit alarms of the module are summated and indicated
by the red alarm LED 'AL' provided on the front plate and sent further
via TDM-bus to the RF converter.
The module can be reset by a push button on the front. Note that the
equipment is not able to send and receive commands for some
seconds after re-initialization.
3.3.2.2.

Inputs

The input circuits can be programmed for four battery voltage ranges
by setting corresponding jumpers. As an aid the jumper settings can
be viewed in a list which is directly printed on the component side of
the module.
The ranges for the nominal battery voltage are:
24 – 47 V DC, 48 – 109 V DC, 110 – 219 V DC and 220 – 250 V DC.
The switching threshold for the input command is about 75 % of the
minimum nominal battery voltage for the chosen range.
A command is usually initiated by applying an external voltage to the
input. Alternatively, an auxiliary on-board voltage of 24 V DC is
available. It can be used to trip the input circuits by just closing an
3-20
1KHW001489-EN
November 2005
ETL600
Structure and Function