Design and Implementation of O/C relay using Microprocessor

• Main Authors: Dr.Abdul-Sattar H. Jasim, Shakir M. Faisal
• Format: Article
• Language: English
• Published: Tikrit University 2012-03-01
• Series: Tikrit Journal of Engineering Sciences
• Subjects: Over current relay; microcomputer module; Pickup current
• Online Access: http://www.tj-es.com/ojs/index.php/tjes/article/view/10

This work presents the design and implementation of a versatile digital overcurrent (<strong><em>O/C</em></strong>) relay using a single microprocessor. The relay is implemented by a combination of a look-up table and a counter. The software development and hardware testing are done using a microcomputer module based on a 8-bit microprocessor. The digital processing of measured currents enables a separate setting of operating values selection of all types of inverse or constant time characteristics overcurrent protection. This protection provides reasonably fast tripping, even at terminal close to the power source were the most serve faults can occur excluding the transient condition. So this method has an excellent compromise between accuracy hardware and speed