FIELD: electrical engineering; interlocking devices for substations and switchgear installations. SUBSTANCE: interlocking device is built up of set of movable longitudinal and transverse strips simulating bus systems and sections, and lines connecting circuit breakers and transformers to buses according to general circuit arrangement of all switchgear installations; some of transverse strips have intricate configuration and are placed at different levels in over lapping manner; they are provided with two-tier locks; some longitudinal strips are split. EFFECT: improved design. 5 cl, 7 dwg
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