fåëí~ää~íáçå
32 oÉîáëáçå=MP=G=fkpq^iiqflk=fkpqor`qflkp=Ua^=G=USNJVOTPKV=
! Remove all covers with the "Filter" inscription from the housings of one busbar run.
! Clean busbar housings that are dirty inside with a hand vacuum cleaner. In this case,
clean the bushing plates too with a humid rag. To moisten the rag, use water
containing a common household cleaner. Then dry the bushings with a lint-free cloth.
! Prepare the flanges of the busbar housings for installation (see Page 21, "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 and place
the originally packed desiccant bags at the corresponding covers.
! Take the desiccant bags out of the packings and lay them completely into the
associated holder in the covers.
! Put the busbar cover with the bags into position, observing 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.
Evacuating the busbar run
with the vacuum pump
Before filling SF
6
-gas in, the air must be removed from the busbar run to be filled with
gas (evacuation). One of the metal covers next to the right and left end panel of the
switchgear contains the pressure indicators and maintenance valves for all busbar runs.
Evacuating a five-panel busbar run takes about 30 to 40 minutes.
ATTENTION!
In the ambient air, the desiccant bags lose their effectiveness rapidly and cannot be
used anymore.
! Use only desiccant bags whose packing is not damaged and whose humidity
indicators in the packing are blue.
! Do not use desiccant bags if the humidity indicators are pink.
! After opening the packings, mount the desiccant bags in the gas compartment
within 30 minutes and close the gas compartment hermetically.
To Next Page
Loading...
