Local closing-command channel

What it represents

Identifies closing requests originating at the switchgear's local operating station. A closing circuit combines an operator or automatic request with the conditions that allow the breaker to close. The closing coil releases stored mechanism energy where that construction is used; it is different from the spring-charging motor.

In a switchgear bus-coupler panel, a close request is checked against position, mechanism readiness and the selected live-bus or dead-bus conditions before the closing circuit is enabled. For this reference, the drawing identifies “Local pushbutton command” at the input and “Local close request” at the output. Local control still depends on the defined interlocks.

Follow request, permission and final coil output as separate signals. A permissive diagram must say which conditions block closing and what happens if a feedback signal becomes unavailable. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

How to read it

• Start at the named input: Local pushbutton command. Identify its source device or document and the state represented on the drawing.
• Follow the named output: Local close request. Cross-reference its destination and separate the command from confirmation that the equipment responded.
• Local control still depends on the defined interlocks.
• Follow request, permission and final coil output as separate signals. A permissive diagram must say which conditions block closing and what happens if a feedback signal becomes unavailable.

Information to show or reference

• Label the source and connection reference for local pushbutton command.
• Identify the destination and defined state of local close request.
• Record the equipment or control-document revision supporting this functional block.
• Check this application limit in the project design: Local control still depends on the defined interlocks.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

About this graphic

This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.

SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.