Improvement on Same Directional Negative Sequence Directional Protection to Avoid Miss Operation Due to Weak-infeed for Double-circuit Transmission Line
For starting problem of same directional negative sequence directional protection, the paper analyzes the cause of same directional negative sequence weak-infeed phenomenon and the defect of traditional protection, and proposes a novel starting criterion based on inverse directional negative sequence component. The simulation results show that the principle can weaken the influence of system resistance and not be affected by fault resistance to start, and it has strong adaptive ability for weak-infeed system of double-circuit transmission line.
parallel transmission lines on the same towerstartinglongitudinal directional protectioninverse directional negative circuitsystem resistance