Time And Current Grading For Protection Relay Type MK1000 & MK2000

Mohamad Naim , Mohamad (2008) Time And Current Grading For Protection Relay Type MK1000 & MK2000. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The main purpose of this project is to investigate the characteristic time grading and current grading using the inverse definite minimum time (IDMT) protection relay type MKlOOO and MK2000.Generally, time grading can be defme as the minimum time to carry the fault current before nearest protection relay disconnect the supply in circuit. Current grading can be used to obtain the correct discrimination in the circuit where it will be a large different ratio of fault current to rated current in the network. Meanwhile the other objectives of this project are to develop a proper test procedure for the time grading and current grading. Beside that computer simulation can be done by using the ERACS software in order to verify the testing results. This project also develops the current injection set with using the autotransformers and toroidal core as the main element. The main purpose of this current injection to produce secondary current around 100 ampere. At the end this project, this research can help the student to understand the basic operation time grading and current grading in the operation protection relay especially the IDMT operation in the low voltages system.

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