Integrated Protection Planning Systems

The traditional approaches for studying coordination between pairs of overcurrent, earth fault and distance protection elements on a project by project basis are inadequate for ensuring the reliable operation of today’s power systems with their increasing complexity and dynamic behaviour.

The PSS®CAPE (Computer Aided Protection Engineering) software is a sophisticated protection simulation tool supporting time stepped integration with the PSS®E transient stability application to deliver unprecedented system planning and protection analysis.

The integrated protection-planning system or IPPS environment, provides a means of incorporating voltage, frequency and power swing elements to capture the response of the network protection to system conditions and post fault dynamic behaviour.

The dynamic planning studies are driven by the response from manufacturer specific models of protection devices using actual relay tap settings, rather than a mimic of the main protection elements in generic representations of the relay with interpreted settings.

The resulting dynamic simulations respond to actual relay operations and have the ability to;

  • – study relay behaviour for unbalanced faults and their consequential impact on system stability,
  • – incorporate generator and load dynamics in protection coordination studies,
  • – consider time variations such as current decays as well as frequency, voltage and power transfer behaviours,
  • – investigate the effectiveness of load shedding schemes and provide a platform for developing and testing control algorithms for more sophisticated special protection schemes applied across wide area networks

With PSS®CAPE integration with PSS®E comprehensive protection reviews and planning assessments considering the complete protection scheme and its performance throughout the entire fault clearing cycle and post fault responses, can be undertaken to provide regular systematic system security assessments across wide network areas with various operating conditions to meet the demands of modern power systems.

download resources

The Applied Power Technologies library provides convenient access to a selection of educational resource designed to assist power system engineers. It contains a number of engineering calculation formula sheets for performing common but non-trivial calculations such as earthing grid resistance values and transmission line constants as well as a number of brief online CAPE software and technical training tutorials.

These resources are provided for educational and reference purposes only and are not suitable for the delivery of professional engineering services.