Hybridized Application of Sectional Difference Protection and Feeder Automation in 10 kV Distribution Networks
The operating environment of 10 kV distribution network equipment is harsh,with a wide variety of equipment types and a high fault rate.If the cooperation between superiors and subordinates is improper,the scope of the fault will be expanded.The analysis and determination strategy for feeder automation startup is inappropriate,and it is impossible to achieve self-healing of fault level skipping trip switches.When transferring loads,the use of time cannot drop from the hourly level to the minute level.According to the different operating conditions of the line,sectional different protection strategies should be used to reduce the occurrence of fault tripping and minimize the scope of power outages.And feeder automation technology is used for assistance to accurately locate fault area and timely assess the scope of power outages caused by faults.This paper analyzes the configuration methods of three-stage protection and zero sequence protection for 10 kV distribution networks,as well as the centralized feeder automation configuration strategy.It may guide the tuning of protection thresholds and information transmission for feeder automation in daily operation and maintenance of distribu-tion networks,and has the potential of improving the efficiency of secondary practicality and power supply reliability.
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