FIELD: short-circuit protection of switchgear installations. SUBSTANCE: metalclad switchgear protective system depends for its operation on combining direct-acting current relay and arc-protection relay responding to changes in light intensity within switchgear cubicles. Supply circuits are connected to rectifier bridge of intermediate current transformer. Auxiliary relay coil is also connected to rectifier bridge and its transfer contacts are inserted in direct-action relay coil circuit. EFFECT: improved design. 1 dwg
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