New area measuring and decision algorithm concepts for power lines' distance protection

The paper presents an innovative concept of the new area measuring algorithm and new area decision algorithm for power lines' distance protection. These algorithms improve the operating conditions of the distance protection. The primary purpose of the new measuring algorithm is correct the short-circuit impedance calculation. The purpose of the new decision algorithm is correct identify of the line operating conditions. For the investigation of classic and proposed new distance protections, a test power network containing the accurate model of the distance protection was developed. Verification simulation studies indicate that the proposed concept achieves the stated objectives. It is expected that the practical application of these new algorithms will enable significant minimization faulty operation of classic distance protection.