METHOD FOR CONTROL OF AUTOMATIC RECLOSURE OF FEEDER SWITCH WITH SHORT-CIRCUITING CONTROL IN OVERHEAD SYSTEM Russian patent published in 2013 - IPC G01R31/02 

FIELD: electricity.

SUBSTANCE: method for control of automatic reclosure of feeder switch with short-circuiting control in overhead system at double-track line with section switch box and voltage transformer to control induced voltage in the overhead system; at that TWR line (two-wire rail line) passes through contact-line supports; the method consists in measuring of induced voltage in the overhead system after emergency cutoff of the feeder switch. At that according to the method the first (U₍₁₎) and third (U₍₃₎) harmonics of induced voltage are chosen, their ratio (B=U₍₃₎/U₍₁₎) is calculated and when B is less than Bo where Bo is the first basic value and U₍₁₎ is bigger than Ao where Ao is the second basic value then feeder switch is turned on; when B is bigger than Bo or U₍₁₎ is less than Ao, then prohibition on feeder switching on is set.

EFFECT: increasing reliability of short-circuiting detection in the line of overhead system.

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