R. Das

Bio: R. Das is an academic researcher. The author has contributed to research in topics: Personal computer & Power-system protection. The author has an hindex of 1, co-authored 1 publications receiving 23 citations.

Modern relays: research and teaching using PCs

Abstract: It is a general perception that power subjects are concerned with the study of high-voltage, high-current components, such as large machines and high voltage transmission lines. But that is a narrow-minded view. The subject of modern protection, for example, is interdisciplinary by nature. This article describes courses and personal computer (PC) based facilities that are available at the University of Saskatchewan, Canada, with a focus on research and teaching in the area of power system protection. Experience with the use of the laboratory facilities is encouraging and shows enhancements to the quality of teaching and research.

Accurate measurement of power system frequency using a digital signal processing technique

Abstract: This paper describes the design, computational aspects, and implementation of a digital signal processing technique for measuring the operating frequency of a power system. The technique provides correct and noise-free estimates for near-nominal, nominal, and off-nominal frequencies in about 25 ms, and it requires modest computations. The proposed technique is implemented using a DSP-based board and has been extensively tested using voltage signals obtained from a dynamic frequency source and from a power system. Some test results are presented in the paper.

An adaptive distance relay and its performance comparison with a fixed data window distance relay

Abstract: This paper describes the design, implementation and testing of an adaptive distance relay. The relay uses a fault detector to determine the inception of a fault and then uses data windows of appropriate length for estimating phasors and seen impedances. Hardware and software of the proposed adaptive relay are also described in this paper. The relay was tested using a model power system and a real-time playback simulator. Performance of the relay was compared with a fixed data window distance relay. Some results are reported in this paper. These results indicate that the adaptive distance relay provides faster tripping in comparison to the fixed data window distance relay.

Distance-Learning Power-System Protection Based on Testing Protective Relays

Abstract: The study of power system of relays requires some previous experience in this field. Laboratories focusing on teaching and researching the area of power-system protection have therefore been amply reported. However, these facilities require the actual presence of the students in the laboratories. To overcome this problem, a power-system-relaying remote laboratory has been developed. To implement this laboratory, a testing system of the relay operating characteristic, together with Matlab-based software, was developed. This remote laboratory enables real power-system-relaying experiments through the Internet. In fact, the user can remotely test a real relay disoperation. This system will therefore allow proficient analysis of sensitivities to relay settings and network configurations.

A Bounded Model of the Communication Delay for System Integrity Protection Schemes

Abstract: This paper investigates the latency of system integrity protection schemes (SIPSs) and proposes a bounded model of the communication delay. To be specific, SIPSs can be divided into wide-area protection and substation-area protection. For the former, the data buffering of phasor data concentrators and the automatic protection switching of synchronous optical network/synchronous digital hierarchy are utilized to limit the latency of regional and backbone networks, respectively; then, the communication delay is modeled as bounded, instead of average or stochastic in the literature. For the latter, the network calculus theory is used to restrict the latency in switched Ethernet networks, and the communication delay is modeled as bounded. In practice, SIPSs need to preprogram the time delay of protective relays and expect the communication delay as predictable or predetermined. Hence, the proposed bounded model is more realistic than the average or stochastic model. Further, the bounded model suggests the network dynamics and worst-case performances. It can be a useful tool in the relay setting as well as in the planning, design, and assessment of SIPS networks.

The Education and Training of Future Protection Engineers: Challenges, Opportunities, and Solutions

Abstract: It is becoming increasingly clear that electric power systems are undergoing rapid changes due to deregulation, the penetration of new technologies, and the adoption of efficient computation, communications, and control mechanisms. The primary goal of this paper is to recognize the importance of education and the training of future protection engineers and, second, to suggest course content needed to meet this challenge.