ABB GSB 245, Техническое руководство

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12 TR A N S FOR M E R BUS H I NG S T Y PE G S B T EC H N I C A L G U I D E
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Connection details
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06 Outer terminal.
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07 Outer shield - GSB 420 and 550.
∅
152.5
D2
125
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 Plating Stud diameter, D2 (mm)
1ZSC999001-AAA Aluminium - 30
1ZSC999001-AAB Aluminium - 60
1ZSC999001-AAC Copper - 30
1ZSC999001-AAD Copper - 40
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.