Study Of Transmission Line Optical-fiber Current Differential Protection Based On Sample Values

The safety of transmission line plays a important role in power system safety It is not only the requirement of ensure supply power reliability, but also the necessary precondition of enhance power system stabilization, to remove faulty line quickly and accurately, also keep non-faulty line continuous work when some transmission line faults current differential protection is a kind of simple, reliable and good-selective protection manner to any variety of transmission lines, power system development needs current differential protection apply to transmission lines, moreover the advancement of electric and communication technology enable current differential protection apply to transmission linesFirstly, the paper discusses, analyses the research and application transmission line protection in detail, compare the principle and realistic presupposition of general line pilot protectionsSecondly, because conventional current vector differential protection are influenced easily by load current and transitional resistance, in order to at the same time quicken protection act, the principle and criterion include work characteristic of differential protect based on fault component sampled values are studied, results shows that differential protect based on fault component sampled values excels general vector current differential protection in reliability, sensitivity and anti-saturation of current transformer in addition, synchronous current sampling methods at all terminals of line is analyzed and estimatedLastly, the principle and criterion .also device design about current sampling values differential protection based on Optical fibercommunication, which apply to short transmission lines are concretely investigated,...