FIELD: electrical engineering.
SUBSTANCE: invention relates to power transmission line protection circuits that perform automatic cutting off followed by repeated cutting it on and respond to difference in currents. Proposed protection circuits allow comparing voltages or currents at appropriate points in different conductors of the same circuit. For example, comparing currents in lead and return conductors. Proposed device comprises the main switch, first and second current pickups, subtraction circuit, current difference variation rate measuring circuit, threshold device, first and second electronic switches, control and display device.
EFFECT: expanded performances.
2 cl, 1 dwg
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|---|---|---|---|
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