Power System Protection and Relay Coordination in NTA 33/11KV Injection Substation
Abstract
This study presents the modelling and simulation of coordinating’s of protective relays at the Nigerian Television Authority (NTA) 33/11 KV injection substation. The injection substation is located at Mgbuoba, in Obio/Akpor Local Government Area of Rivers State. This research analyzes the poor order of operation of relays in Nigerian Television Authority NTA 33/11kv Injection substation. The substation consists of four 11kv feeders namely Ohakwe, Location, Mgbouba and Ozuoba feeders. Power Supply to NTA 33/11kv Injection substation is through 33kv distribution line duly linked to Rumousi 132/33kv transmission station. When a fault occurs and the main protection fails, the backup protection must intervene to isolate the fault, the defective part must be quarantined when a short circuit is identified to avoid destruction and ensure the safety of personnel and equipment. Programmed relays observe and control the circuit breakers. The circuit breaker is switched off by the relay in the event of a fault. Relays are designed to distinguish between fault and normal conditions and provide protection. The main research objectives were to model NTA 33/11kv injection substation network using ETAP 19.0.1 to analyze the network, and using Newton Raphsons method of load flow analysis to determine the operating voltages at the various bus levels and impedance based method of short circuit analysis to determine the short circuit impedance and the magnitude of the short circuit using ohm’s law.
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