Research on the Backup Protection and Selectivity of Upper Circuit Breaker and Lower Circuit Breaker in Case of High Short-circuit Current
The concept of current three-section is introduced,the selectivity of upper circuit breaker and lower circuit breaker when the selectivity-limit current Is exceeds the threshold for short-circuit protection of the upper circuit breaker is analyzed,and relevant suggestions for practical engineering application are proposed.
series circuit of circuit breakerselectivitycurrent three-sectionselectivity-limit currentselectivity coordination tablelimit breaking capacity of circuit breakerbackup protectionprotection coordination
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