Installing Solid-Insulated Bars At The Panel Connection, And Filling The Circuit-Breaker Housings With Sf6 Gas - Siemens 8DA10 Series Installation And Operating Instructions Manual

Filling the circuit-breaker
housings with SF gas
6
Evacuating and filling
the circuit-breaker
housings with the
maintenance unit
861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
➭ Undo the locking cap of the gas filling valve marked with B0 for the circuit-breaker housings.
➭ Connect the vacuum pump to the valve. Use short tubes with a large inside diameter.
➭ Evacuate the circuit-breaker housings down to a pressure of less than 2 kPa.
Manometer indication: -100 kPa. Measure the pressure with the vacuum pump locked.
➭ Depending on the inside diameter and length of the vacuum pump tube, let the pump
operate for another 5 to 15 minutes.
➭ Remove the pump tube. The gas filling valve closes automatically.
➭ Determine the filling pressure required according to the type plate and the data given in
Section "Technical data" (see page 31, "Technical data"). The pressure depends on the gas
temperature.
➭ Connect the gas filling equipment to the gas filling valve of the evacuated circuit-breaker
housings.
➭ Fill circuit-breaker housings with SF
filling pressure on the manometer for the circuit-breaker housings and on the manometer of
the gas filling equipment.
➭ Remove the connecting tube of the gas filling equipment from the gas filling valve.
The gas filling valve closes automatically.
➭ Refit the locking cap of the gas filling valve.
➭ In the case of non-compensated manometers for circuit-breaker housings: Adjust the limit
pressures on the pressure indicators (signaling contacts) in the manometer with the
supplied square socket spanner (see page 35, "Insulating gas").
The procedure to be followed corresponds to the work operations described above for
evacuating and filling without maintenance unit. As against working with vacuum pump and
gas cylinder, the maintenance unit offers better environmental protection due to reduced SF
losses.
The same gas pressure data apply as for filling with gas cylinder. Observe the operating
instructions of the maintenance unit!
22.3 Installing solid-insulated bars at the panel connection, and filling the circuit-
breaker housings with SF
When solid-insulated bars are installed, the circuit-breaker housings are ventilated. The circuit-
breaker housings are already equipped with desiccant bags for eliminating the residual
humidity in the gas filling. To expose the desiccant bags as briefly as possible to the ambient
air, the following assembly operations are performed completely for one bar connection on
one panel each.
In the ambient air, the desiccant bags lose their effectiveness rapidly
The formation of condensation can lead to corrosion of switchgear parts. High air
humidity can lead to creepage distances.
➭ If a gas compartment has been open for more than 30 minutes, replace all desiccant bags.
➭ Do not open the packing of the desiccant bags until right before putting them into the
panel.
➭ Use only desiccant bags whose packing is not damaged and whose humidity indicators in
the packing are blue.
➭ If the humidity indicators are pink, do not use the desiccant bags.
➭ If the desiccant bags have been exposed to the air for more than 30 minutes, do not use
the desiccant bags anymore.
➭ After opening the packings, mount the desiccant bags in the gas compartment within
30 minutes.
➭ Close the gas compartment hermetically with sealing rings (O-rings).
➭ Evacuate the gas compartment immediately.
until the necessary pressure is reached. Check the
6
gas
6
WARNING
Installation
6
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