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Product Guide
1MRS758725
SSC600
Product version: 1.0
4
ABB
earth faults close to the neutral earthing point of the transformer.
Either the conventional high-impedance scheme or a numerical
low-impedance scheme can be selected for protection of the
transformer windings. When low-impedance restricted earth-
fault protection is used neither stabilizing resistors nor varistors
are needed and as a further benefit the transforming ratio of the
neutral earthing CTs can differ from those of the phase current
transformers. Due to its unit protection character and absolute
selectivity restricted earth fault does not need to be timegraded
with other protection schemes, and therefore high speed fault
clearance can be achieved. The device also incorporates a ther-
mal overload protection function, which supervises the thermal
stress of the transformer windings to prevent premature aging
of the insulation of the windings. Multiple stages of short circuit,
phase overcurrent, negative-sequence and earth-fault backup
protection are separately available for both sides of the power
transformer. Earth-fault protection based on the measured or cal-
culated residual voltage is also available. Further, the device also
offers circuit breaker failure protection.
The device offers all the functionality needed to manage motor
start-ups and normal operation, also including protection and fault
clearance in abnormal situations. The main features of the device
include thermal overload protection, motor start-up supervision,
locked rotor protection and protection against too frequent motor
start-ups. The device also incorporates nondirectional earth-fault
protection, negative phase-sequence current unbalance protec-
tion and backup overcurrent protection. Furthermore, the device
offers motor running stall protection, loss-of-load supervision and
phase reversal protection. In certain motor drives of special im-
portance there must be a possibility to override the motor thermal
overload protection to perform an emergency start of a hot motor.
To enable an emergency hot start, the SSC600 offers a forced
start execution feature.
Some product options additionally offer multifrequency admit-
tance-based earth-fault protection providing selective directional
earth-fault protection for high-impedance earthed networks. The
operation is based on multifrequency neutral admittance measure-
ment utilizing fundamental frequency and harmonic components
in Uo and Io. A special filtering algorithm enables dependable and
secure fault direction also during intermittent/restriking earth faults.
It provides a very good combination of reliability and sensitivity of
protection with a single function for low ohmic and higher ohmic
earth faults and for transient and intermittent or restriking earth
faults.
SSC600 also features optional arc fault protection of the circuit
breaker, busbar and cable compartment of metal-enclosed indoor
switchgear. Light detection needs to be included in the bay level
devices.
3. Supported ABB Solutions
The SSC600 Smart Substation devices together with the Substa-
tion Management Unit COM600S constitute a genuine IEC 61850
solution for reliable power distribution in utility and industrial power
systems. To facilitate the system engineering, ABB’s devices are
supplied with connectivity packages. The connectivity packages
include a compilation of software and device-specific information,
including single-line diagram templates and a full device data
model. The data model includes event and parameter lists. With
the connectivity packages, the devices can be readily configured
using PCM600 and integrated with COM600S or the network
control and management system MicroSCADA Pro.
The SSC600 Smart Substation devices offer native support for
IEC 61850 Edition 2 also including binary and analog horizontal
GOOSE messaging. In addition, with process bus the receiving of
sampled values of voltages is supported. Compared to traditional
hardwired, inter-device signaling, peer-to-peer communication
over a switched Ethernet LAN offers an advanced and versatile
platform for power system protection. Among the distinctive
features of the protection system approach, enabled by the full
implementation of the IEC 61850 substation automation standard,
are fast communication capability, continuous supervision of the
protection and communication system’s integrity, and an inherent
flexibility regarding reconfiguration and upgrades.This protection
device series is able to optimally utilize interoperability provided by
the IEC 61850 Edition 2 features.
At substation level, COM600S uses the data content of the
devices to enhance substation level functionality. COM600S
features a Web browser-based HMI, which provides a customiz-
able graphical display for visualizing single-line mimic diagrams for
switchgear bay solutions. Substation devices and processes can
also be remotely accessed through the Web HMI, which improves
personnel safety.
In addition, COM600S can be used as a local data warehouse for
the substation’s technical documentation and for the network data
collected by the devices. The collected network data facilitates
extensive reporting and analyzing of network fault situations by
using the data historian and event handling features of COM600S.
The historical data can be used for accurate monitoring of process
and equipment performance, using calculations based on both
real-time and historical values. A better understanding of the
process dynamics is achieved by combining time-based process
measurements with production and maintenance events.