Control; Measurements; Power Quality - ABB ABILITY SSC600 Product Manual

Product Guide
SSC600
Product version: 1.0
COM600S can also function as a gateway and provide seamless
connectivity between the substation devices and network-level
control and management systems, such as MicroSCADA Pro and
System 800xA. In addition COM600S can combine redundant
SSC600 units so network-level systems see only a single solution.
GOOSE Analyzer interface in COM600S enables the following and
analyzing the horizontal IEC 61850 application during commis-
sioning and operation at station level. It logs all GOOSE events
during substation operation to enable improved system
supervision.

4. Control

SSC600 integrates functionality for the control of a circuit breaker
via the Web HMI or by means of remote controls. In addition to
the circuit-breaker control the device features control blocks which
are intended for motor-operated control of disconnectors or circuit
breaker truck and for their position indications. Further, the device
offers control block that is intended for motor-operated control of
earthing switch control and its position indication.
Two physical binary inputs and two physical binary outputs are
needed in the bay level merging unit or in the IED (not in SSC) for
each controllable primary device taken into use.
If the amount of available binary inputs or outputs of the chosen
merging unit or IED is not sufficient, an external input or output
module, for example, RIO600 can be integrated to the IED. The
binary inputs and outputs of the external I/O module can be used
for the less time critical binary signals of the application.
SSC600 includes WHMI and a single-line diagram (SLD) with
position indication for the relevant primary devices. Interlocking
schemes required by the application are configured using the sig-
nal matrix or the application configuration functionality of PCM600.
Depending on the product options, the device 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.

5. Measurements

Based on received 9-2 streams, SSC600 continuously measures
• The phase currents
• The symmetrical components of the currents
• The residual current and residual voltage, based on the
received process bus measurements
• The residual voltage
• The phase voltages
• The voltage sequence components
• Frequency
ABB
The device also calculates the demand value of the current over
a user-selectable, pre-set 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 device offers three-phase power and energy
measurement including power factor.
The measured values can be accessed remotely via the commu-
nication interface of the device. The values can also be accessed
locally or remotely using the Web HMI.

6. Power quality

In the EN standards, power quality is defined through the char-
acteristics of the supply voltage. Transients, short-duration and
long-duration voltage variations and unbalance and waveform dis-
tortions 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 sys-
tem 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.
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 shortduration 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.
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