This single-line diagram depicts a medium voltage electrical distribution system with 11kV incoming supply transformed to 400V for consumer distribution. This system features a G.O. switch (gang operated) with cable box connections to underground cables, transformer protection via 11kV O.C.B. (oil circuit breaker), and a step-down transformer rated at 1MVA. The low voltage side includes a 400V bus-bar with multiple outgoing feeders protected by OCBs (oil circuit breakers). Each feeder shows proper CT (current transformer) installations for metering and protection, with typical ratings of 200:5 for secondary current measurement. The diagram follows standard electrical symbology with transformers represented as dual windings, circuit breakers shown with appropriate break points, and directional arrows indicating power flow to consumers. The entire system incorporates proper isolation and protection coordination to ensure selective tripping during fault conditions.
11kV/400V Power distribution Single-Line Diagram With CTs
