کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
398665 1438748 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Equal transfer processes-based distance protection of EHV transmission lines
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر هوش مصنوعی
پیش نمایش صفحه اول مقاله
Equal transfer processes-based distance protection of EHV transmission lines
چکیده انگلیسی


• Coupling capacitor voltage transformers can cause the distance relay overreach.
• We make the voltages and currents to have the same transfer links.
• We re-structure the voltage at the fault point.
• The virtual digital transfer method is used.
• The measuring error is within 5% at 15 ms after fault occurrence.

The overreach of the distance protection caused by CCVT is still a serious problem for high-speed line protections. Based on the theory of Equal Transfer Process of Transmission Lines (ETPTLs), a new high-speed distance relay scheme is proposed in order to overcome above problem. The solution is to make the three-phase voltages and currents at the relay location and the voltage at the fault point have the same transfer links by virtue of a new design. Three major steps of the new method are demonstrated: re-structuring of the voltage at the fault point, the virtual digital transfer method and solving the R–L differential equation. A variety of ATP simulation tests show that the new method effectively reduces the transient error caused by CCVT and improves the operating speed by a series of technical countermeasures including three major steps, iterative calculations of the fault distance and an inverse time delay setting criterion. The distance measuring error is within 5% at approximately 15 ms after fault occurrence, which is superior to various adaptive protection algorithms based on CCVT transient error estimation or source impedance ratio (SIR).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Electrical Power & Energy Systems - Volume 52, November 2013, Pages 81–86
نویسندگان
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