Evaluation and Optimization of Protection System Coordination in Electric Power Distribution Networks to Improve System Reliability
Keywords:
System Reliability, Protection System Distribution NetworkAbstract
The reliability of electric power distribution systems is a crucial factor in maintaining service continuity and quality for customers. One of the key factors influencing system reliability is the performance and coordination of protection systems. This study aims to analyze the impact of protection system coordination optimization on the reliability of a 20 kV medium-voltage distribution network. A quantitative approach was employed by evaluating the existing protection coordination, optimizing relay settings, and analyzing system reliability indices. The data used include network configuration, fault data, Over Current Relay (OCR) and Ground Fault Relay (GFR) settings, as well as reliability indices such as SAIDI and SAIFI. The results indicate that optimization of protection coordination improves selectivity and fault clearing speed, as reflected by the enhanced Time–Current Characteristic (TCC) curves. Furthermore, the SAIDI value decreased from 185 minutes/customer/year to 112 minutes/customer/year, while the SAIFI value decreased from 4.2 interruptions/customer/year to 2.6 interruptions/customer/year. These findings demonstrate that protection system optimization significantly contributes to improving the reliability and service quality of electric power distribution systems.
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