Short circuit/Fault Current Notification in Subtransmission system by Message Cellular Network

This paper was studied the preliminary system of short circuit current detection in sub-transmission system. It can utilize rapidly working staff for the Province Electrical Authority (PEA) and PEA’s control center to limit the investigative area of contingency circuits. So the short-circuit or over current is the problem in electrical transmission line network, what to effected the damageable electrical protection devices such as fuse, circuit breaker etc. it’s cause to occur the back-out event. It need spend several time to repair. For this research have proposed the automatic short-circuit current warning system via a mobile phone network by microcontroller processing. This system can be monitor the current value in real time short circuit condition using the current transformer device 1 set per 1 phase at all three phase. If the one of three phase current values exceeded the specified value. The system detector would send the current value in form short message service (SMS) to the mobile phone the specified number. It could be monitor that measured current values at any time all three phase. Finally, the experimental results in 3 area as Petchaburi’s PEA, PEA-substation and Big-C department store, they could detect short-circuit current in sub-transmission line any area. As the results have correct measuring current average 98.78%. This system can help to monitor and repair the sub-transmission line/ sub-feeder rapidly.