Siemens 38-3AH3 38 kV instruction manual Installation checks and functional tests

Removal from cell in indoor switchgear if not on raised pad and Shelter-Clad outdoor switchgear

After performing the spring discharge check (with control power de-energized), remove the circuit breaker from its switchgear cubicle.

1.Insert the racking crank on the racking screw on the front of the circuit breaker cell, and push in (refer to "Racking crank engagement procedure" on page 11). This action operates the racking-interlock latch. Figure 2 shows circuit breaker racking.

2.Rotate the racking crank counterclockwise until the circuit breaker is in the DISCONNECT position, as indicated on the racking mechanism.

3.Move the circuit breaker release latch (on the floor of the cell near the right side of the circuit breaker) to the left and pull the circuit breaker out from the DISCONNECT position. The circuit breaker can now be removed from the cubicle.

4.The circuit breaker is now free to be rolled out onto the floor using the handles on the front. The wheels of the circuit breaker are at floor level (unless the switchgear is installed on a raised pad), and one person can normally handle the unit.

Removal from cell in outdoor non-walk- in enclosures or for indoor switchgear installed on a raised pad

Removal of the circuit breaker from a non- walk-in outdoor-switchgear assembly is similar to removal of a circuit breaker at floor level with several additional steps.

Figure 3 shows the two extension rails inserted into the fixed rails within the cell. The rails engage locking pins in the fixed rails to secure them in position. The procedure for removal of a circuit breaker not located at floor level is:

1.Close the circuit-breaker compartment door and secure all latches.

2.Insert the racking crank onto the racking screw on the front of the circuit-breaker cell, and push in (refer to "Racking crank engagement procedure" on page 11). This action operates the racking-interlock latch.

3.Rotate the racking crank counterclockwise until the circuit breaker is in the DISCONNECT position.

4.Open the circuit-breaker compartment door and insert the two extension rails into the fixed rails. Be sure the extension rails are properly secured in place.