Fault detecting method using harmonics and state transition diagram on transmission lines

摘要

It discloses a fault detection method using a harmonic of the state transition diagram in the transmission line. The present invention, when a failure occurs in the transmission line, to a fault detection method using a harmonic of the state transition diagram. Using a steady-state characteristic of the apparent impedance and transient state characteristics of harmonic component size the sum of the outputs of two logic signals. And, 2 Using the logic signal to the input of the state transition diagram, characterized in that it is possible to estimate the state of the system in the course of a state transition according to the state of the system.; According to the invention, not only can prevent a malfunction of the distance relay in a state, such as increased or voltage instability in the load, by using a harmonic of the state transition diagram can estimate the status of the grid, than the failure of the transmission line reliability has a number of advantages that allow to detect.