Protected Object Models as the Basis of Distance Measuring Units Algorithms Synthesis

In the present study, the algorithms of distance protection (DP) for a high-voltage transmission line are considered. The single, parallel and tapped transformer lines can be as a protected object. The steady-state and transient modes in the model of protected objects are described by the node-voltage equations, which may be in simplified record either taking into account all parameters or not taking into account some mode parameters. DP efficiency depends on the record form of the node-voltage equations. The programmed distance measuring units algorithms synthesized based on the protected object model are analysed.