ABB REF601 제품 설명서 - 페이지 5
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ABB
Feeder Protection
REF601 IEC
Product Version: 1.0
The SoE information can be accessed locally
via the user interface on the relay front panel
or remotely via the communication interface of
the relay.
8. Recorded data
The relay stores records of analog values for
two trip events in non-volatile memory. The
fault recording is triggered by the trip signal of
protection function. A sample of analog value is
recorded for every power frequency cycle. Fifteen
such samples are recorded, five before the trip
and ten after the trip event. These records enable
the user to analyze the two most recent power
system events. Each record includes the current
values for three phases and earth current.
The relay records the number of phase and earth
fault trip events into dedicated trip counters.
These trip counters can not be reset by the user
and are stored in non-volatile memory.
The recorded information can be accessed locally
via the user interface on the relay front panel and
can be uploaded for subsequent fault analysis.
9. Self-supervision and
Test function
The relay's built-in self-supervision system con-
tinuously monitors the state of the relay hardware
and the operation of the relay software. Any fault
or malfunction detected will be used for alerting
the operator. A permanent relay fault will block
the protection functions of the relay to prevent
incorrect relay operation.
The relay supports a built-in test mode which
enables user to test the relay HMI and trip out-
puts.
10. Access control
To protect the relay from unauthorized access
and to maintain the integrity of information, the
relay is armed with a three level, role-based user
authentication system with individual password
for the operator, engineer and administrator
level. The password is a combination of different
navigation keys.
11. Inputs and outputs
The relay is equipped with three Rogowski sensor
inputs. The relay has an additional earth-current
input suitable for a 1A core-balanced current
transformer which is normally used in applica-
tions requiring sensitive earth-fault protection.
Relay analog input and binary input/output
overview:
• Three sensor inputs
• One core-balance current transformer input
for external earth-current measurement
• Four dedicated binary inputs for Remote
trip, Remote reset, Remote close, Remote
open
• Two trip outputs with pulsed operation,
one normally-closed and one normally-
open
• Two signalling outputs, one for phase over-
current trip and one for earth fault trip
• One breaker close output
• One Unit ready / IRF output
• LED indication for Ready/IRF, Protection
start, Protection trip, Phase fault and Earth
fault trip
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