Siemens 8DA10 Series Installation And Operating Instructions Manual page 96

Installation
Evacuating the busbar run
with the vacuum pump
96/214
➭ Prepare the flanges of the busbar housings for assembly
(see page 62, "Preparing busbar assembly").
➭ Clean the sealing surfaces of the busbar housing covers with a lint-free paper, and apply
a thin film of grease.
➭ Determine the size of the desiccant bags required for each busbar housing.
➭ Place the desiccant bags in their original packing at the corresponding covers.
➭ Remove the desiccant bags from the packings.
➭ Lay the desiccant bags completely into the associated holder in the busbar housing covers.
➭ Put the busbar housing covers with the inserted bags into position. Do not jam any parts of
the desiccant bags in the sealing surfaces; otherwise, there will be leaks.
➭ Fasten the busbar housing covers crosswise. Tightening torque: 20 Nm.
Before filling with SF gas, the air must be removed from the busbar run to be filled with gas
6
(evacuation). One of the covers next to the right and left end panel of the switchgear contains
the manometers and gas filling valves for one busbar run.
Evacuating a five-panel busbar run takes about 30 to 40 minutes.
Fig. 108: Manometer and gas filling valve at
the switchgear front
➭ Undo the locking cap of the gas filling valve ③ from the closed busbar run.
➭ Connect the vacuum pump to the valve of the busbar run. Use short tubes with the largest
inside diameter possible.
➭ Evacuate the housings down to a pressure of less than 2 kPa.
Manometer indication: -100 kPa. Measure the pressure with the vacuum pump locked.
Fig. 109: Detail view of manometer
➭ Depending on the inside diameter and length of the vacuum pump tube, let the pump
operate for another 5 to 15 minutes.
➭ Remove the vacuum pump tube. The gas filling valve closes automatically.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
①
Designation for the busbar run
② Manometer
③
Gas filling valve
①
Signaling contact:
Pressure lower than minimum functional level
②
Signaling contact:
Minimum functional level
③
Gas pressure indicator:
Rated functional level 120 kPa
④ Signaling contact:
Maximum functional level 180 kPa
The data in kPa are values at
20 °C ambient air temperature