ABB REJ 527 Product Manual page 3

Features
Application
Design
Directional or Non-Directional Earth-Fault
Relay
• Directional or non-directional low-set earth-
fault current stage with definite-time or
inverse definite minimum time (IDMT) char-
acteristic
• Directional or non-directional high-set
earth-fault current stage with definite-time
characteristic
• Deblocking zero-sequence voltage stage
with definite-time characteristic
• The two earth-fault current stages can be
configured to operate alternatively as two
voltage stages: three-stage voltage moni-
toring operation possible
• Intermittent earth-fault protection
• Circuit-breaker failure protection (CBFP)
• Disturbance recorder
- recording time up to 19 seconds
- triggering by a start or a trip signal from
any protection stage and/or by a binary
input signal
- records two analogue channels and
seven digital channels
- adjustable sampling rate
• Non-volatile memory for
- up to 60 event codes
- setting values
- disturbance recorder data
- recorded data of the five last events with
time stamp
The directional or non-directional earth-fault
relay REJ 527 is a secondary relay which is
connected to the voltage and current trans-
formers of the object to be protected. The
earth-fault current and the zero-sequence
voltage unit continuously measure the zero-
sequence voltage, earth-fault current and
phase angle of the object. On detection of a
fault, the relay will start, trip the circuit
breaker, provide alarms, record fault data,
etc., in accordance with the application and
the configured relay functions.
The voltage unit includes low-set stage U
and the earth-fault current unit low-set stage
I > and high-set stage I >>. The earth-fault
0 0
The relay includes a high-set and low-set
earth-fault current unit, a zero-sequence volt-
age unit and a circuit-breaker failure protec-
Issued: 17.06.19994
Status: Updated
Version: C/16.10.2002
Data subject to change without notice
- number of starts for each stage
- alarm indication messages and LEDs
showing the status at the moment of
power failure
• Galvanically isolated binary input with a
wide input voltage range
• All settings can be modified with a personal
computer
• HMI with an alphanumeric LCD and
manoeuvring buttons
• IEC 60870-5-103 and SPA bus communi-
cation protocols
• Two normally open power output contacts
• Two change-over signal output contacts
• Output contact functions freely config-
urable for desired operation
• Optical PC-connector for two-way data
communication (front)
• RS-485 connector (rear) for system com-
munication
• Continuous self-supervision of electronics
and software. At an internal relay fault
(IRF), all protection stages and outputs are
blocked.
• User-selectable rated frequency 50/60 Hz
• User-selectable password protection for
the HMI
• Display of primary current and voltage val-
ues as well as phase angle values
• Multi-language support
stages can be replaced by two additional volt-
age stages, low-set stage U
stage U >>.
0
The protection functions are independent of
each other and have their own setting groups
and data recordings. The voltage and current
functions use conventional transformer mea-
surement.
An output contact matrix allows start or trip
signals from the protection stages to be
routed to the desired output contact.
b>
0
tion unit. Further, the relay includes an HMI
module, a self-supervision system and a dis-
turbance recorder.
REJ 527
1MRS751132-MBG
> and high-set
0
3