Evaluation of the overcurrent relay coordination system on the 69 KV Kiwalan Substation done by CEC

Date

7-2016

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Power Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Kim Jay R. Rosario

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

This study evaluated the overcurrent relay coordination system on the 69 kV Kiwalan substation. Each relay's operation was evaluated, using the actual relay test results provided by CEC, in reference from the simulation results using ETAP based on IEC Standard 60255-151. The simulation determined the trip time and sequence operation of the protective relays under fault condition. Upon evaluation, it was found that for the instantaneous element, using the IEC standard of a maximum allowable trip time error of ± 4.1667 ms, five out of nine instantaneous relays passed. In the case of inverse-time element, all nine inverse time relays passed the evaluation of a maximum allowable time curve deviation of ± 4% based on IEC standard. For the sequence of operation, the simulation for all relays connected to the outgoing feeders are well coordinated where the relays closest to the fault location tripped first, followed by the upstream adjacent relays. However, for the substation's two incoming lines, a coordination problem was encountered in which a wrong trip sequence was observed due to the time curve setting of the relays. Overall, despite some relays failing the evaluation, proper corrective action can be done to reduce the trip time error and correct the coordination between the relays.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993 2016 E64 /R63

Document Type

Thesis

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