232
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
External triggering can be made by means of the reserved input signal
“PQ 3Unf trig” connected to digital input. The settings can be found in
Main menu\Configuration\Input Signals\PQ 3Unf trig.
The function can deliver the alarm signal “PQ 3Unf cum”, an output signal for
exceeding a setting limit for cumulative probability of a harmonic and the
“PQ 3Unf har”, an output signal for exceeding a setting limit for a harmonic. The
alarm signals can be routed to the output contacts via the switchgroups. The
connection settings can be made in Main menu\Configuration\Output
SWGRP\Alarm 1\ or \Alarm 2\. The “Alarm 1” or “Alarm 2” output signal
can be then connected to an output relay and the settings are done in
Main menu\Output Signals\.
Refer to the CD-ROM
Technical Descriptions of Functions (PQCU3H) for more
information about the power quality function.
11.7. Motor protection, High H07
11.7.1. Features
This application example describes a single busbar motor feeder including:
• Non-directional overcurrent protection
• Negative phase sequence (NPS) protection
• Motor start-up supervision
• Thermal protection for motors
• Non-directional undercurrent protection
• Phase reversal protection
• Fuse fail protection
Three-phase current measurement is established with current transformers, and
residual voltage is measured with a set of voltage transformers in an open-delta
connection. Phase-to-phase voltage measurements are established with voltage
transformers.
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