Presentation Of Hf9024 Relay - AEG DUA2.1 Technical Manual And User Manual

User Guide
HF9024

1. PRESENTATION OF HF9024 RELAY

This relay is fully numerical relays designed to perform electrical protection and
control functions.
HF9024 relay is powered either from a DC or an AC auxiliary power supply.
Using the front panel, the user can easily navigate through the menu and access
data, change settings, read measurements, etc.
Eleven LEDs situated in the front panel help the user to quickly know the status
of the relay and the presence of alarms. Alarms that have been detected are
stored and can be displayed on the back-lit LCD.
Any short time voltage interruption (<50ms) is filtered and regulated through the
auxiliary power supply.
HF9024 relay have 3 phase inputs available for 1 and 5 Amps rated CTs. On
each one of these relay.
HF9024 relay continuously measure phase and earth currents and take into
account the true RMS current value up to 10th harmonic (at 50 Hz).
Output relays are freely configurable and can be activated by any of the control
or protection functions available in the relay. Logic inputs can also be assigned to
various control functions.
On their rear terminals HF9024 have a standard RS485 port available. When
ordering, the user can choose between the following communication protocol:
ModBus RTU.
Using RS485 communication channel, all stored information (measurements,
alarms, and parameters) can be read and settings can be modified when the
chosen protocol allows it.
HF9024 relay can be connected directly to a digital control system. All the
available data can then be gathered by a substation control system and be
processed either locally or remotely.