A protective relay plays a crucial role in the normal operation of a power system and the reliable supply of electrical power. The reliable operation of an electrical power transformer is very important in maintaining uninterrupted power supply. In a protective scheme for a transformer, high speed of protection and reliable operation against clear faults are essential.
Many advanced algorithms for power system protection have been implemented on the relay protection devices based on microprocessors in programming form. To be candid, there are no references showing the results related to the design and implementation of a multi-function protective relay for a power transformer.
Im Jung Bin, a researcher at the Faculty of Electrical Engineering, has proposed a method for implementing a modularized multi-functional hardware transformer protective relay based on Field programmable gate array (FPGA) for higher speed operation of protection.
Taking the advantage of parallelism feature of FPGA, the proposed hardware transformer relay can process multi-channel input signals at high speed in real time, and concurrently estimate and process protective logics with different functions. By using a single Altera CycloneⅢ EP3C40Q240CN8 and configuring different-function protective relays, this relay allows high-speed operation which is a basic demand for protection.
This relay can operate within 1.1 cycle of power frequency.
You can find details in his paper “A Structure of Transformer Protective Relay for Implementing a High-speed Operation of Many Protective Functions Using a Parallel Processing Feature of FPGA” in “Journal of Electrical Power & Energy Systems” (EI).