Notes on electrical switchgear Part -II

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Bus Bar size depends upon these factors Bus bar current – (Rated Voltage, maximum current rating of the bus bar, Fault current in kA and duration of fault) Temperature – Operating temp, max. temp during the fault, temp rise due to fault, ambient temp and max. allowable temp rise. Enclosure Detail – Installation area (indoor/ outdoor, natural ventilation), Panel size, Panel plinth level. Bus bar – Material of bus bar, arrangement (vertical or horizontal) Current density of bus bar material Material constant (K) Material strength (kg/cm2) Bus bar Support Insulator Details – Distance between insulators on Same Phase(l), Insulator Height […]

Notes on electrical switchgear

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Components of switchgear assembly Low Voltage switchgear components MCCB – Moulded case circuit breaker with or without over current protection Interlocking Provision Switchgear Cradle PT and control PT CT Control switches Indicator lights Main bus bars, Run backs Bus risers and cable lugs Fused interrupter switches Relays – Protective and monitoring auxiliary relays Protective fuses for breaker control Measuring meters   Medium Voltage switchgear Circuit Breakers (oil, air, SF6, vacuum) Switching device Instrument transformers Capacitor tripping device Relays Meters & instruments Main bus Control & indicating devices, jumpers, cable lugs, cable supports and potheads Barriers and shutters Instrument compartments Test switches […]