1. Description
ABB Ability™ Smart Substation Control and Protection for elec-
trical systems SSC600 is a smart substation device designed for
protection, control, measurement and supervision of utility substa-
tions and industrial switchgear and equipment. The design of the
device has been guided by the IEC 61850 standard for commu-
nication and interoperability of substation automation devices. It
is fully integrable with Relion series IEDs for creating a complete
solution. Optional functionality is available at the time of order
for both software and hardware, for example, special application
packages and additional communication modules.
Figure 1. SSC600
Re-engineered from the ground up, the SSC series has been de-
signed to unleash the full potential of the IEC 61850 standard for
communication and interoperability between substation automa-
tion devices.
The device provides main protection for overhead lines and cable
feeders in distribution networks. The device is also used as back-
up protection in applications, where an independent and redun-
dant protection system is required.
Depending on the chosen product options, the device is adapted
for:
• Protection for overhead line and cable feeder in isolated
neutral, resistance earthed,compensated and solidly earthed
networks.
• Protection, control, measurement and supervision of asyn-
chronous motors in manufacturing and process industry.
• Transformer protection and control for power transform ers,
unit and step-up transformers including power genera tor-
transformer blocks in utility and industry power distribution
systems.
Once the device has been given the application-specic settings,
it can directly be put into service.
2. Protection functions
The device offers directional and non-directional overcurrent and
thermal overload protection as well as directional and nondirec-
tional earth-fault protection. Some product options allow as an
option admittance-based, harmonics-based or wattmetric-based
earth-fault protection to be used in addition to directional earth-
fault protection. Further, the device features sensitive earth-fault
protection, phase discontinuity protection, transient/intermittent
earth-fault protection, distance protection, overvoltage and
undervoltage protection, residual overvoltage protection, posi-
tive-sequence undervoltage and negative-sequence overvoltage
protection. Frequency protection, including overfrequency, under-
frequency and frequency rate-of-change protection, is offered in
devices with some product options. The device also incorporates
optional three-pole multishot autoreclosing functions for overhead
line feeders.
The device features three-phase, multi-slope stabilized (biased)
stage transformer differential protection and an instantaneous
stage to provide fast and selective protection for phase-tophase
short circuit, winding interturn fault and bushing ashover pro-
tection. Besides second harmonic restraint, an advanced wave-
form-based blocking algorithm ensures stability at transformer
energization and a fth harmonic restraint function ensures good
protection stability at moderate overexcitation of power transform-
ers.
Sensitive restricted earth-fault protection completes the overall
differential protection providing detection of even single phase-to-
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