Application of phase angle measurement for real time security monitoring of Indian Electric Power System- An Experience

The Indian electric power system has expanded manifold and is on a high growth phase. The five synchronous separate geopolitical grids, which developed independently, have been integrated gradually. In August 2006, the 25 GW Northern grid was synchronised to the “North East-East-West” grid to form the North East—East-West grid now designated as the “N-E-W grid” having installed capacity of around 90 GW (peak 60 GW). The 25 GW South India grid (installed capacity of over 36 GW), is presently connected asynchronously to the N-E-W-grid through 4 GW of HVDC links Fig. 1.