Power Quality Trigger; Master Trip; External Trip; Lockout Reset - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS 751802-MUM
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Protection Relay
Technical Reference Manual, Standard Configurations

Power quality trigger

Any of the inputs DI1...DI9 can be used to start the power quality recording
measurements.

Master trip

An external trip signal can be routed to the heavy duty tripping contact via
DI1...DI9. (The Master trip function bypasses the interlocking sequence.)
Master trip can be utilized by using the input selector and SWGRP to connect one
of the digital inputs (DI1...DI9) to the high speed tripping coil (HSPO1).

External trip

An additional external trip signal can be routed to the output relays PO1...PO3 and
SO1...SO2 (The external trip function bypasses the interlocking sequence).

Lockout reset

Any DI1...DI9 can be programmed to reset the Lockout function.

Local/Remote

Any of the digital inputs can be used for activating the local mode of the relay if the
Local/Remote selection is set to "external input". In local position, the circuit
breaker can be controlled via the binary inputs and the HMI but not through a
communication port. In remote position, the circuit breaker can be controlled only
through a communication port.

Close enable

DI1...DI9 can be used for giving the permission to close the circuit breaker. For
example, SF6 gas low indication signal can be used to block the close operation of
the CB (The Close command can be activated either via the digital inputs, the HMI
or through the communication port).

Direct control (Open/Close)

DI...DI9 can be used for controlling the circuit breaker.

Object indication

Object indication is used to collect object status indications to MicroSCADA. The
interlocking logic also uses the logical states of the digital inputs (according to the
selected interlocking option).
The transferring of object status indication data to MicroSCADA is achieved by
using the I<->O IND1 and I<->O IND2 function blocks.

Time synchronization

Digital input 9 can be used as a GPS time synchronization input.
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