ABB BRIT-90-35-1000 Manual de instrucciones - Página 7

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ABB Power Grids Ltd.

Table 2

Shert term

Max. 6 months

Medium term

Max. 2 years

Long term

More than two years

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

Outdoor, protected from rain

In original transportation box, covered

with plastic.

It is recommended:

Additional moisture protection with a

second plastic bag and desiccant

cartridge.

Not recommended

GKSL 680205.021 RE

Rev. 2, 26.09.2019

Indoor

In original transportation box or unpacked

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