A real time DSP based differential protection of Low voltage busbar

Abstract

Medium and Low voltage busbar is important equipment in the electrical power system, and its protection demands simple, reliable, economic & sensitive relaying scheme. This paper presents design, implementation and testing of low voltage busbar relaying scheme in laboratory environment using TMS320LF2407A Digital Signal Processor (DSP). Current differential algorithm is designed based on the DSP platform which can reduce large amounts of calculation, expedite the protection's trip and reduces the hardware requirements. Authors have developed a laboratory prototype of the threephase busbar system containing 3-phase bus, current transformers, line components, fault switches and DSP trainer kit. Experimental results are provided to verify the effectiveness of the proposed scheme. The scheme provides stability against external faults, sensitivity towards high resistance internal faults and better reliability in discriminating in-zone and out of zone faults.

Auto‐reclosing scheme with adaptive dead time control for extra‐high‐voltage transmission line

“…The high-performance, 10-bit, 8 channels analogue-to-digital converter (ADC) has a minimum conversion time of 500 ns. The auto sequencing capability of the ADC allows a maximum of 8 conversions in a single conversion session without any CPU overhead [19]. All these specifications are appropriate to implement the auto-reclosure relaying algorithm.…”

“…The numerical relay should be capable of processing digital and analog input signals in order to improve the response of protective systems [19]. The implementation of the proposed algorithm is performed in the numerical processor written in embedded 'C' using ATmega 328P AVR microcontroller provided by ATMEL.…”

Development of a New Bus Zone Identification Algorithm Based on Phase Angle Comparison Using Sequence Components of Currents

“…Outcome of the PSCAD is then interfaced with MATLAB, where the proposed algorithm is implemented. Moreover, this algorithm has also been validated on laboratory prototype [27]. The performance of the proposed algorithm has been tested and verified over a large test data set considering wide variation in different system and fault conditions.…”