University of Khartoum

False Tripping of Feeders in Distribution Network (Sympathetic Tripping)

False Tripping of Feeders in Distribution Network (Sympathetic Tripping)

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Title: False Tripping of Feeders in Distribution Network (Sympathetic Tripping)
Author: Hassan, Mohamed Eltayeb Abdelrahman
Abstract: The stability of power system networks is very essential in the provision of electrical services. The objective of this study is to determine the reasons behind the tripping of healthy feeders in electrical distribution network, due to faults on other feeders; this phenomenon is called sympathetic tripping. This phenomenon has been observed on Elsarameek 33 KV feeder in Free Zone Substation in Khartoum North. The problem was the tripping of this feeder due to faults on other feeders in this substation. Actual data were obtained from the Sudanese Electricity Distribution Company and the network has been modeled and simulated using electromagnetic transient analysis program ETAP 12.5. The results showed that any earth fault occurring on any feeder in Free Zone substation leads to earth fault tripping of Elsarmeek feeder. To solve this problem the network has been simulated after isolation of the neutral point from the earth and the results showed no tripping of Elsarmeek feeder .The results showed that the leakage earth current was 768 Amps before the solution and zero Amps after the solution. This solution led to good stability on Elsarmeek feeder when actually applied.
Description: 64 page
URI: http://khartoumspace.uofk.edu/123456789/26678


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