ABB RED615 Product Manual - page 14
6. Control
The IED offers control of one circuit breaker
with dedicated push-buttons for opening and
closing. Interlocking schemes required by the
application are configured with the signal
matrix in PCM600.
7. Measurement
The IED continuously measures the phase
currents, the symmetrical components of the
currents and the residual current. If the IED
includes voltage measurements it also
measures the residual voltage. In addition,
the IED calculates the demand value of
current over a userselectable pre-set time
frames, the thermal overload of the protected
object, and the phase unbalance value based
on the ratio between the negative sequence
and positive sequence current.
Further, the IED monitors the phase
differential, bias and remote end phase
currents.
The values measured can be accessed locally
via the user interface on the IED front panel
or remotely via the communication interface
of the IED. The values can also be accessed
locally or remotely using the web-browser
based user interface.
8. Disturbance recorder
The IED is provided with a disturbance
recorder featuring up to 12 analog and 64
binary signal channels. The analog channels
can be set to record either the waveform or
the trend of the currents and voltage
measured.
The analog channels can be set to trigger the
recording function when the measured value
falls below or exceeds the set values. The
binary signal channels can be set to start a
recording on the rising or the falling edge of
the binary signal or both.
By default, the binary channels are set to
record external or internal IED signals, for
example the start or trip signals of the IED
stages, or external blocking or control
signals. Binary IED signals such as a
protection start or trip signal, or an external
IED control signal over a binary input can be
set to trigger the recording. The recorded
information is stored in a non-volatile
memory and can be uploaded for subsequent
fault analysis.
9. Event log
To collect sequence-of-events (SoE)
information, the IED incorporates a non-
volatile memory with a capacity of storing 50
event codes with associated time stamps. The
non-volatile memory retains its data also in
case the IED temporarily loses its auxiliary
supply. The event log facilitates detailed pre-
and post-fault analyses of feeder faults and
disturbances.
The SoE information can be accessed locally
via the user interface on the IED front panel
or remotely via the communication interface
of the IED. The information can further be
accessed, either locally or remotely, using the
web-browser based user interface.
10. Recorded data
The IED has the capacity to store the records
of four latest fault events. The records enable
the user to analyze the four most recent
power system events. Each record includes
the phase, differential and bias current
values, the start times of the protection
blocks, time stamp, etc. The fault recording
can be triggered by the start signal or the trip
Line Differential Protection and Control
1MRS756500 B
RED615
Product version: 2.0
Issued: 03.07.2009
14
ABB