ABB Power Grids Ltd.
GKSL 680205.021 RE
Rev. 2, 26.09.2019
7
Table 2
Outdoor, protected from rain
Indoor
Shert term
Max. 6 months
In original transportation box, covered
with plastic.
It is recommended:
Additional moisture protection with a
second plastic bag and desiccant
cartridge.
In original transportation box or unpacked
Medium term
Max. 2 years
Not recommended
In original transportation box or unpacked
Long term
More than two years
Not recommended
In original transportation or unpacked.
Only in dry rooms, temperature as constant
as possible. The desiccant cartridge should
be checked regularly.
or:
Lower part of the bushing in a storage
container, filled with oil or dry nitrogen
*) Both methods are applicable with all
warranties preserved
6.3 Proceeding after inexpert storage
If there is suspicious the weather storage conditions don’t conform to the table above, it is possible, that
humidity has been got into the insulation by a diffusion process. This must be diagnosed by capacitance
and power factor (tg
) measurement at about 10 kV between head and measuring tap. If the deviation of
the power factor is more of a test report value at 0,1 %, please contact ABB Power Grids Ltd., Russia for
further information about the drying procedure.
7
Installation
7.1.
Handling
During unpacking be careful to avoid porcelain insulator damage. A sling and a lifting device (Figure 2)
will be required while taking the bushing out of the box. One end of the sling is put around the porcelain
between the two uppermost sheds. The other end is slung around the flange. If placed on the ground, the
bushing shall be supported at the same points as in the box.
Examine the bushing to make sure the porcelain insulator is undamaged, take off the plastic cover and make
sure that the body is undamaged too.
For bringing the bushing into vertical position the easiest this is done with two lifting gears and two textile
slings. One sling has to be put around the flange and directly taken to one lifting gear. The other sling is
fixed around the two uppermost porcelain sheds and attached to the other lifting gear. With lifting gears the
bushing is first raised horizontally and then the flange end is lowered.
Attention!
The bushing should not be turned into vertical position with only one rope. The bushing can slip through
and fall down.
Another option for lifting a bushing into a vertical position is to use one crane. In this case instead of the
crane which used for lifting the flange side can be used another lifting gear, which hanged on the hook of
the same crane.
For lifting of a bushing at a certain angle with a single crane can be used a polyspast. For this one end of a
sling is fixed to the eye screw of the flange and another end through the polyspast is fixed to a hook of a
