Installation On The Transformer; Attaching The On-Load Tap-Changer To The Transformer; Welding; Bolting - ABB UZE Installation And Commissioning Manual

On-load tap-changers with motor-drive mechanism, type buf 3

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4 Installation on the transformer

4. Installation on the transformer

The on-load tap-changer must not be included in the drying process of the transformer.

The on-load tap-changer is either bolted or welded to the transformer tank, see

section 4.1.

NOTE: In the event of the on-load tap-changer being delivered without a tank, the

transformer manufacturer has to make the tank and mount it onto the transformer

tank; or make the on-load tap-changer tank integrated with the transformer tank.

Appendix A includes a welding and mounting instruction. In this case, continue with

section 4.2 directly.

For welding the on-load tap-changer to the transformer tank, use fillet weld with a ≥ 4 mm

(Fig. 6).

Fig. 6. Welding detail.

A set of cork-rubber gaskets is provided to seal against the transformer tank.

When you install the on-load tap-changer, the gasket should be glued as described below.

Tighten the bolts by approximately 90 Nm torque.

Ensure that the surfaces being in contact with the gaskets are clean and free from grease

and oil.

After cleaning, stick the gaskets to the transformer tank flange (Fig. 7) with ABB glue

1 3401-608, by brushing glue on both the gasket and the flange.

On-load tap-changer

flange

Transformer tank

fm_00071

CAUTION

a ≥ 4 mm

1ZSE 5492-115 en, Rev. 5

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