Generalization of sequence component method of multi-parallel lines on same towers

The twelve-sequence components are independent from each other.

Based on the analysis of the transmission capability of double-circuit transmission lines on the same tower in fault states and unbalanced states using six-sequence component method,an optimal trip scheme for double-circuit transmission lines on the same tower is proposed.

According to distributed parameter model and six sequence component,this paper analyzes and deduces a novel calculation formula for the measured impedanee of single phase ground distance relay for UHV dnuble-circuit transmission line and uses.

Design of integrated circuit positive sequence component and negative sequence component filter;

A new method for detecting the fundamental negative and positive sequence components as well as the harmonic components is developed in this paper.

By using the positive sequence component of voltage and current synchronously sampled at both terminals,the positive-sequence voltage of fault point can be deduced from both terminal based on uniform transmission line equations,then the fault location equation can be got.

Design of integrated circuit positive sequence component and negative sequence component filter;

Principle investigation and simulation research on pilot zero sequence directional protection with compensation of negative sequence component;

The new scheme uses zero sequence components as operation component and negative sequence components as restraint component to discriminate whether the fault is in the internal or external zone.