Siemens 38-3AH3 38 kV instruction manual Setting

1.7Remove bolt (31.2), lock washer and large washer at stationary contact of the vacuum interrupter (24 mm socket with extension). Carefully note location of the conductive spacer between vacuum interrupter and pole support. This spacer has a concave surface that must be handled with care to avoid damage.

1.8Using a deep 24 mm socket with an extension, loosen and remove the hex-cap screw fastening the upper pole-support to the post insulator. Completely remove the upper pole- support and set aside.

1.9Grasp the vacuum interrupter (30.0) and withdraw vertically upward. Assistance may be required to spread the clamp and work the terminal clamp off the movable stem of the vacuum interrupter. FORCIBLE TWISTING EFFORT IS NOT ALLOWED. If the terminal clamp cannot be easily removed, STOP!, check to be certain hardware is loose and the clamp is not binding.

2.0 Installing a vacuum interrupter

Note: Replacement vacuum interrupter (30.0) will be received from the factory with an eye bolt (36.3) in place, adjusted and torqued to specific requirements. DO NOT ALTER THE ADAPTER (eye-bolt)

SETTING.

2.1Inspect all silver-plated connection surfaces for cleanliness. Clean only with a cloth and solvent. Do not abrade, as this will damage the silver plating.

2.2Insert vacuum interrupter (30.0) in the lower pole-support (40.0) with the vacuum-interrupter label facing away from the mechanism housing. Slip terminal clamp (29.2) into position on the movable stem.

2.3Install the conductive spacer between the fixed (upper) terminal of the vacuum interrupter (30.0) and the upper pole-support (20.0), with the concave side of the spacer facing the vacuum interrupter. Align vacuum interrupter and fasten finger-tight using heavy flat-washer, lock washer and nut (31.2).

2.4Fasten the upper pole-support to the post insulator using finger pressure only using hex-head (M16) bolt, lock washer and flat washer.

2.5Attach struts (28.0) to the upper pole- support (20) and replace hardware (M10), but do not tighten at this time.

2.6Couple levers (48.6) and drive link (48.9) to the eye bolt (36.3), using the pin supplied. Apply retention clips. Appropriate pin is modestly chamfered, not to be confused with pin for the insulated coupler.

2.7Raise terminal clamp (29.2) against the spacer (29.3) on the movable terminal of the vacuum interrupter (36.1) and position the vacuum interrupter (30.0) so that its groove faces the connecting surface of flexible strap (29.1). Refer to Figure 47: Illustration showing required technique for fastening terminal- clamp hardware on page 57 and employ the technique illustrated to fasten the terminal clamp. Note opposing wrenches. Tighten the bolt(s) of the terminal clamp to a torque of 40 Nm (30 ft-lb), taking care to see that the terminal of the vacuum interrupter is not subjected to excessive bending movement.

Note: Excessive bending movement exerted while fastening the terminal clamp will damage the vacuum interrupter.

2.8Align pole support (20.0) correctly and tighten bolt fastening it to the post insulator. Fasten securely all bolts associated with struts (28.0).