As a follow up of one of the recommendations of Enquiry Committee headed by Chairman, CEA on grid disturbances that took place in Indian grid on 30th and 31st July 2012, Ministry of Power constituted a ‘Task Force on Power System Analysis under Contingencies’ in December 2012. The Terms of Reference of Task Force broadly cover analysis of the network behavior under normal conditions and contingencies, review of the philosophy of operation of protection relays, review of islanding schemes and technological options to improve the performance of the grid.
Apart from the main Task Force two more sub-committees were constituted, one for system studies for July-September 2013 conditions and another for examining philosophy of relay and protection coordination.
The tasks assigned to the protection sub-committee were to review the protection setting philosophy (including Load encroachment, Power swing blocking, out of step protection, Back-up protections) for protection relays installed at 765 kV, 400 kV, 220 kV (132 kV I NER) transmission system. The details given below are part of the work done by this Protection Sub- committee
