Short Circuit Current Protection Scheme In 500kV Transmission System

Mohamad Fahmi, Mohamad Noh (2013) Short Circuit Current Protection Scheme In 500kV Transmission System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Electricity is well known as the driving force for a country, which is undergo rapid industrialization for the last few decades. Configuring large power supply in high load density networks and interconnections between power grids will cause enormous short-circuit current. A fault current limiter offers a choice in such case. First, this paper attempts to give an overview of fault current clearance equipment for medium and high voltage applications. Based on the 16th edition of IEEE wiring regulation, short circuit current is originated from the term overcurrent which is had been describe as a current that exceed its rated value. The main function of protection is to distinguish fault or failed section in the power distribution system with the suitable safety that will only cause small disruption to the power supply. If the times of the short circuit increase, the damaged it may bring to the system will increase. In medium and high voltage circuit breaker, any failure in protection system will causing instability to the power system to the whole country. It is very important to setup the right equipment in the power protection system. The usage of relay in the power system could discriminate the faulty condition. For extra high voltage system, high speed IDMT relay is used to clear the fault before it damage the system. The relay coordination study also will help to determine the most effective way to clear the faulty condition. 3 type of different relay can be used to distinguish its effectiveness in the distance protection based on its setting. With the help of PowerWorld and Matlab software, the simulation of the 3 relay can be simulate on the power system. Powerworld software can be used to create the 500kV power system and Matlab can be used to determine the appropriate relay setting. The most suitable setting is the one that could operate efficiently with the circuit breaker.

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