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Adaptive Smart Feeder Automation (FA)
Applications
The fault handling solution for "adaptive smart feeder automation" follows the principle of balancing "reliable power supply" and "rapid handling," further optimizing the fault handling strategy for local feeder automation. The solution does not rely on communication or the master station. It completes fault handling and self-healing recovery through local coordination of switches, with fewer switch actions and shorter outage times. It effectively enhances the distribution network's ability to cope with extreme weather conditions and disaster resistance, advancing the construction of a modern smart distribution network. Since the large-scale application of integrated primary and secondary circuit breakers, it has provided the equipment foundation for optimizing local FA. The switches have built-in zero-sequence voltage and zero-sequence current, complete short-circuit and ground fault protection functions, and fast opening and closing action capabilities.
System Composition
Section switches do not open under loss of voltage, and fault detection accelerates protection opening during temporary power restoration.For transient faults, section switches do not open, and the line switch recloses to restore full-line power supply quickly.For permanent faults, when the line switch recloses, the section switch accelerates opening.Three-level short-circuit protection and five-level grounding protection ensure reliable and rapid fault isolation.Fault handling approaches include step-by-step reclosing isolation and local tripping isolation to adapt to different scenarios


Step-by-step reclosing isolationAdvantage: Effectively reduces outage time and switch operation count, suitable for multi-section lines, and operational mode adjustment requires no configuration changes.Issue: The switch operation process remains complex, adding one short-circuit impact.


Local tripping isolationAdvantage: Feeder switch completes fault handling with one reclosing, minimizing outage time and switch operations.Issue: Section switches require precise delay configuration, support is limited to typically three sections, and operational mode adjustment requires configuration changes.


Functional Features
  • Achieves rapid isolation of short-circuit and grounding faults with fast power restoration for non-fault areas: 2 seconds for transient faults, under 20 seconds for permanent faults.
  • Feeder switch requires only one reclosing, with fewer switch operations and faster speed;
  • Fully utilizes the configuration and performance of primary-secondary integrated devices without additional configuration;
  • No reliance on master station or communication;
Cases
Dongfang Electronics Corporation participated in formulating the adaptive intelligent distributed FA solution. FTU and DTU terminals already support adaptive intelligent FA fault handling, deployed in Zaozhuang (Shandong), Changzhi (Shanxi), and other regions. Leveraging strong technical capabilities, Dongfang Electronics Corporation develops customized FA solutions including fiber-optic-based intelligent distributed FA (Shanghai), 5G-based intelligent distributed (Hunan), differential protection for Shengli Oilfield, and graded protection + 4G intelligent distributed (Gansu).