ABB REJ 527, Technical Reference Manual

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1MRS 750616-MUM Directional or Non-Directional Earth-Fault Relay
Technical Reference Manual
REJ 527
The REJ 527 will start to collect data from all the stages when a protection function
starts. When each stage has dropped off, the collected data and the time stamp will
be stored in the first event register and the four previously stored events will move
one step forward. When a sixth event is stored, the oldest event will be cleared.
4.1.9. External serial communication
4.1.9.1. Communication ports
The REJ 527 is provided with two serial communication ports: an optical
PC-connection on the front panel and an RS-485 connection on the rear panel.
The D9S-type RS-485 connector is used to connect the relay to the distribution
automation system. This connection enables the use of either the SPA bus
communication protocol or the IEC 60870-5-103 communication protocol. The
fibre-optic interface module RER 103 is used to connect the relay to the fibre-optic
communication bus.
Although the RER 103 supports LON bus communication, the REJ 527 does not
support the LON protocol. LON communication requires a separate LSG device.
Table 4.1.8-1 Recorded data
REGISTER Recorded data
EVENT1 • The zero-sequence voltage, U
0
, the earth-fault current, I
0
, the directional
earth-fault current, I
ϕ
, and the phase angle,
ϕ
, measured as percentages of
the rated voltage and current. The angle is shown in degrees.
• Duration of the last starts of stages t
b
>, t
0
> and t
0
>>, expressed as a
percentage of the set operate time, or of the calculated operate time at IDMT
characteristic. The timing will start when a stage starts. A value other than
zero means that the corresponding stage has started whereas a value which
is 100% of the set or calculated operate time means that the stage has
tripped. If the operate time for a stage has elapsed but is blocked, the value
will be 99% of the set or calculated operate time.
• Time stamp for the event; date and time. The time when the last stage drops
off will be stored. The time stamp is displayed in two registers, one including
the date expressed as yy-mm-dd, and the other including the time expressed
as HH.MM; SS.sss.
EVENT 2 Same as EVENT 1.
EVENT 3 Same as EVENT 1.
EVENT 4 Same as EVENT 1.
EVENT 5 Same as EVENT 1.
Number of
starts • The number of times each protection stage, i.e. U
0b
>, I
0
> and I
0
>>, has
started, counting up to 999.