ABB GSB 420 Technisches Handbuch - Seite 12

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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

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Connection details

The outer terminal needs to be specified in each case. The

outer terminal is then used together with a draw rod, an

inner terminal, or a fixed bottom contact.

Outer terminal

The outer terminal consists of a cylindrical stud. The

mounting arrangements are the same for all GSB bushings,

regardless of size, current rating and internal connection

system. All GSB terminal studs will thus fit any GSB bushing.

The terminal stud assembly consists of a stud, a tightening

ring, a gasket, bolts and washers. The electrical contact

function and the sealing function are completely separated.

The stud is first fastened to the bushing top with 6 bolts,

M10, which provide the proper electrical contact. The

contact surface is located inside the gasket and is thus well

protected from corrosion. Finally, the tightening ring with

the gasket is pressed against the stud by means of 6

additional bolts, M8.

The outer terminal is available in a number of standard

configurations. Other configurations can be supplied on

request.

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Table 5. Outer terminal. Max. torque on outer terminal 200 Nm.

Cat. No.

Material

1ZSC999001-AAA

Aluminium

1ZSC999001-AAB

Aluminium

1ZSC999001-AAC

Copper

1ZSC999001-AAD

Copper

Separate terminal plate with bolts

The separate terminal plate is available for stud with ø30

mm, and used for connecting the bushing to the line

conductor.

Outer shield

This shield is standard for GSB 420 (Cat. No. 2748 682-DN)

and 550 (Cat. No. 2748 682-DY). GSB 245 and 362 fulfil all

requirements of the IEC and IEEE tests without outer shield.

However, if extra shielding of the connected power lines is

required, outer shield (Cat. No. 2748 682-DN) can be

supplied on request also for these.

Plating

Stud diameter, D2 (mm)

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06 Outer terminal.

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07 Outer shield - GSB 420 and 550.

∅152.5