METALCLAD SWITCHGEAR CUBICLE DISCONNECTING DEVICE Russian patent published in 1998 - IPC

FIELD: relay protection of electrical equipment. SUBSTANCE: device has light conductor, photoelectronic converter, AND circuit, gate pulse shaping circuit, current- ratio log taking unit, signal divider of n- amplitude pulse selectors, and n final elements, where n is number of cubicles under check. Each end of light conductor is connected to input of its respective photoelectronic converter whose outputs are connected to first and second inputs of AND circuit and to first and second inputs of current-ratio log taking unit. Output of AND circuit is connected through gate pulse shaping unit to third input of current-ratio log taking unit whose output is connected to signal divider. Each of n-outputs of signal divider is connected through respective pulse amplitude selector to input of respective final element. EFFECT: reduced probability of false operation. 1 dwg