Measurements; Power Quality; Disturbance Recorder; Event Log - ABB REG615 Product Manual

Generator and Interconnection Protection
REG615
Product version: 5.0 FP1
the relevant primary devices. Interlocking schemes required by
the application are configured using the signal matrix or the
application configuration functionality of PCM600. Depending
on the standard configuration, the relay also incorporates a
synchrocheck function to ensure that the voltage, phase angle
and frequency on either side of an open circuit breaker satisfy
the conditions for safe interconnection of two networks.

7. Measurements

The relay continuously measures the phase currents and
voltages, the symmetrical components of the currents and
voltages and the residual current and voltage. The relay also
calculates the demand value of the current over a user-
selectable, preset time frame, the thermal overload of the
protected object, and the phase unbalance based on the ratio
between the negative-sequence and positive-sequence
current. Furthermore, the relay offers three-phase power and
energy measurement including power factor.
The generator and interconnection relay is provided with
frequency adaptability support that can be enabled with a
setting parameter. Frequency adaptability enables protection
and measurement operation over a wide frequency range of
0.2...1.4 × Fn by using three phase-voltage inputs to track the
network frequency.
The measured values can be accessed via the local HMI or
remotely via the communication interface of the relay. The
values can also be accessed locally or remotely using the Web
HMI.
The relay is provided with a load profile recorder. The load
profile feature stores the historical load data captured at a
periodical time interval (demand interval). The records are in
COMTRADE format.

8. Power quality

In the EN standards, power quality is defined through the
characteristics of the supply voltage. Transients, short-duration
and long-duration voltage variations and unbalance and
waveform distortions are the key characteristics describing
power quality. The distortion monitoring functions are used for
monitoring the current total demand distortion and the voltage
total harmonic distortion.
Power quality monitoring is an essential service that utilities can
provide for their industrial and key customers. A monitoring
system can provide information about system disturbances and
their possible causes. It can also detect problem conditions
throughout the system before they cause customer complaints,
equipment malfunctions and even equipment damage or
failure. Power quality problems are not limited to the utility side
of the system. In fact, the majority of power quality problems
are localized within customer facilities. Thus, power quality
monitoring is not only an effective customer service strategy but
also a way to protect a utility's reputation for quality power and
service.
ABB
The protection relay has the following power quality monitoring
functions.
• Voltage variation
• Voltage unbalance
• Current harmonics
• Voltage harmonics
The voltage unbalance and voltage variation functions are used
for measuring short-duration voltage variations and monitoring
voltage unbalance conditions in power transmission and
distribution networks.
The voltage and current harmonics functions provide a method
for monitoring the power quality by means of the current
waveform distortion and voltage waveform distortion. The
functions provides a short-term three-second average and a
long-term demand for total demand distortion TDD and total
harmonic distortion THD.

9. Disturbance recorder

The relay 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 voltages 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 either
on the rising or the falling edge of the binary signal or on both.
By default, the binary channels are set to record external or
internal relay signals, for example, the start or trip signals of the
relay stages, or external blocking or control signals. Binary relay
signals, such as protection start and trip signals, or an external
relay control signal via a binary input, can be set to trigger the
recording. Recorded information is stored in a non-volatile
memory and can be uploaded for subsequent fault analysis.

10. Event log

To collect sequence-of-events information, the relay has a non-
volatile memory capable of storing 1024 events with the
associated time stamps. The non-volatile memory retains its
data even if the relay temporarily loses its auxiliary supply. The
event log facilitates detailed pre- and post-fault analyses of
feeder faults and disturbances. The considerable capacity to
process and store data and events in the relay facilitates
meeting the growing information demand of future network
configurations.
The sequence-of-events information can be accessed either via
local HMI or remotely via the communication interface of the
relay. The information can also be accessed locally or remotely
using the Web HMI.
1MRS758279 B
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