Development of a novel single chip solution for a motor protection relay

Abstract

Advent of “System on Chip” technology has redefined the consumer electronics industry. The main advantage of such SoC based systems is cost and space effectiveness. Such systems are available for very cheap cost, which can be further used for some practical purposes with little effort, hence very practical solution for the applications such as protective relays. In this paper a “Universal” Motor Protection relay is proposed utilizing Soc based design approach. Furthermore, a digital low-pass FIR filter has also been implemented on the same chip, which overcomes the requirement of external filtering. The Xilinx-Spartan FPGA is used to implement the relay which takes three phase currents as input and provides a number of protections for the motor like over-current, under-frequency, over-frequency, thermal protection and negative phase sequence, etc. It has been shown that not only the hardware requirement is optimized but also the response time is improved with respect to the existing prototypes.