Table of Contents
Advertisement
Installation
Evacuating the circuit-
breaker housings with
the vacuum pump
Filling the circuit-breaker
housings with SF
gas
6
Evacuating and filling
the circuit-breaker
housings with
the maintenance unit
92/214
➭ Remove the lateral cover of the bursting disc with the "Filter" inscription on one circuit-
breaker housing.
➭ Unpack two new desiccant bags of 250 g each per pole, and put them completely into the
holder.
➭ Clean the sealing surfaces of the cover of the bursting disc with a lint-free paper, and apply a
thin film of grease.
➭ Put the covers the bursting disc with the bags into position. Observe that no part of the bags
is jammed in the sealing surfaces in order to prevent leaks.
➭ Bolt the covers tight crosswise. Tightening torque: 20 Nm.
➭ Repeat the above work operations for all circuit-breaker housings on the same panel where
the desiccant bags must also be fitted.
➭ After completing the replacement of desiccant agent in the panel, evacuate the circuit-
breaker housings and fill them with SF
The circuit-breaker housings of one panel form a common gas compartment. Before filling
SF
gas in, the air must be removed from the circuit-breaker housings (evacuation).
6
The pressure indicator and the gas filling valve for the circuit-breaker housings of one panel
are located on the right side of the housing front.
➭ Undo the locking cap of the gas filling valve for the circuit-breaker housings.
➭ Connect the vacuum pump to the valve. 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.
➭ 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 rating plate and the data given in
Section "Technical data" (see page 42, "Technical data"). The pressure depends on the gas
temperature.
➭ Connect the SF
gas cylinder to the gas filling valve of the evacuated circuit-breaker
6
housings.
➭ Fill SF
into the circuit-breaker housings until the necessary pressure is reached. Check the
6
filling pressure on the pressure indicator of the circuit-breaker housings and on the pressure
indicator of the gas filling equipment.
➭ Remove the connecting tube of the gas cylinder from the gas filling valve. The gas filling
valve closes automatically.
➭ Refit the locking cap of the gas filling valve.
➭ Adjust the limit pressures on the pressure indicator for the circuit-breaker housings with the
supplied square socket spanner (see page 44, "Insulating gas SF
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!
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
gas (see below).
6
6
").
6
Advertisement
Table of Contents
