ABB GSB 245 Panduan Teknis - Halaman 5

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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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Design

GSB is a Resin Impregnated Paper (RIP) bushing

intended for immersed oil – air service. The

bushing is built up around an aluminium center

tube on which the condenser core is wound. The

core is wound from crepe paper with aluminium

foil inserts for electrical stress control. The core

is impregnated and cured in a vacuum, giving a

partial discharge free bushing with low tan δ

(dissipation factor). After curing, the core is

machined and a flange and an insulator are fitted.

The insulator is made of composite or porcelain.

The space between the RIP core and the insulator

is then filled with an insulating gel.

As a current conductor, GSB uses the center tube

on which the RIP core is molded. The oil side

connection can be made with a draw-rod system,

Outer terminal

Top piece

Composite or

porcelain insulator

Test tap

Mounting flange

RIP core

Bottom contact

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01 Transformer bushing type GSB oil – air.

an inner terminal for draw lead, or a fixed bottom

contact. The bottom contact is normally delivered

with a standard end-shield. An alternative bottom

contact is available to fit customized end-shields

for draw rod only. For the air side connection

there are studs available in a number of standard

configurations, but it can also be modified to suit

any connection need.

The bushing is designed to be mounted at an

angle not exceeding 90° from the vertical. The

standard colour of the composite insulator is

ANSI 70 light gray.

Standards

The GSB bushing is designed and tested

according to IEC 60137 and IEEE C57.19.00/01.

Features and benefits

• Solid (Oil free) – Reduced risk of fire. Oil leakage

from the bushing eliminated.

• Seals the transformer – Reduced risk of fire.

Risk of oil leakage from the transformer

reduced.

• Non-shattering materials – Silicone insulator.

Protection of people and equipment.

• Easy handling – Safe transport - even when

mounted on the transformer.

• Light weight, compact – Easy handling, small

space requirements inside transformer, low life

cycle environmental impact.

• Seismic qualified by shake table tests.

Transportation and long term storage

On the oil side of the bushing, a metallic sealing

container, containing drying agent, is fitted. The

sealing container will protect the oil side from

moisture absorption. It is important that the

sealing container is fitted during transport and

storage. The container is suitable both for short-

time storage (≤6 months) and long-time storage.

The bushing can be stored outdoors when the

sealing container is fitted.

As an option, the moisture barrier "RIPCOAT" can

be supplied as extra protection when the

container is not mounted.