ABB GSB 550-1675 Teknik Kılavuz - Sayfa 15

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1. Standards

T R A N S F O R M E R B U S H I N G S T Y P E G S B T E C H N I C A L G U I D E

Fixed bottom contact

The fixed bottom contact (Cat. No. 1ZSC999002-AAE) uses

the same bottom contact as in the draw rod system, i.e. it is

made of copper in one piece and has 4 threaded holes for

cable lugs. The fixed bottom contact system also uses the

center tube as a current conductor but it is secured to the

center tube with a pulling ring instead of the draw rod. The

pulling ring is made of aluminium and is threaded on to the

center tube. The bottom contact is then fastened to the ring

with six M10 bolts, similar to the outer terminal. End-shield,

Cat. No. 1ZSC999003-AEA, is suitable for the bottom

contact. Type 2 bottom contact cannot be used with fixed

bottom contact.

Standard end-shield

The end-shield is made of aluminium and coated with

insulating epoxy paint or 3 mm of pressboard. The design

enables easy installation and should be used with standard

draw rod bottom contact, the fixed bottom contact system

and the adapter for the inner terminal.

—

Table 8. End-shield. Bottom contact type 1 (see Fig. 11) must be used

together with standard end-shield.

Cat. No.

Coating

1ZSC999003-AEA

Epoxy paint

1ZSC999003-AEB

3 mm pressboard

Conductor insulation

Draw leads must be insulated with vacuum oil-impregnated

insulating paper or equivalent, to give sufficient insulation

integrity. The paper insulation must be a minimum of 2 mm.

The paper insulation must be taken at least 30 mm inside

the end-shield hole.

—

10 Fixed bottom contact 1ZSC999002-AAE.

R296

R350

—

11 End-shield.

65 45

∅142

R32

∅258

M12

(4x)

R25

265