Catalogs >
ABB AG >
TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV
1 / 8Pages

Catalog excerpts

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV - 1

High voltage products TG Gas-insulated high voltage current transformers 72.5 - 800 kV Power and productivity for a better world1

Open the catalog to page 1

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV - 2

Description Gas-n isulaied riiyn voltage current transi or mer s 72.5 - 800 kV - For outdoor installation - Hot zinc-plated ferrous components - Synthetic rubber gaskets resistant to sulphur hexafluoride and unaffected by thermal variations - No partial discharges - Construction in conformity with ISPESL Italian standards - Electrical signalling for low gas pressure - Design according to IEC 60044-1 standards - Temperature range: from -60 °C to +55 °C 2

Open the catalog to page 2

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV - 3

The TG type current transformers are derived from the T 145-420 type transformers, which have already been in production for a long time. Their architecture, electromagnetic sizing and primary and secondary transfer devices remain the same. As before, the cores and secondary windings are located at the top, in the head of the CT. High voltage insulation is entirely obtained in SF6 gas instead of with paper-oil. Considerable and numerous advantages are gained thanks to this solution: - dielectric quality no longer depends on complex and lengthy treatments then followed by delicate checks. In...

Open the catalog to page 3

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV - 4

Main characteristics Base plate The base plate consists of a spcial light alloy casting. By means of a tube, it supports the live part of the transformer, closes the supporting insulator at the bottom and incorporates the secondary terminal box, the filling valve and the densimeter. The insulator can either be made of high strength porcelain or of a composite material with silicone rubber sheds. Both types comply with the strictest mechanical requirements (CENELEC-ANSI-ISPESL Standards). Head and live parts The metallic head of the transformer is cast in a special alloy, using a special...

Open the catalog to page 4

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV - 5

Production Systems The benefit gained from the particular design choice of the TG current transformers has been further increased by using suitable production systems. Assembly is carried out in a specially fitted workshop, designed taking into account both the experience gained in the field of transformers insulated in oil-paper and also that of the metal-clad SF6-insulated circuit-breakers and apparatus. In particular, the same procedures for pressure and air tightness testing are followed. The cores precision class check is carried out on automated test benches. A special laboratory with...

Open the catalog to page 5

TG -Gas-insulated high voltage current transformers - 72.5 - 800 kV - 7

-0 F- 5 G H 2 3 4 o < -11 8 4 x 023 -E--D- 7 10 -6 9- -L-1800- A B C D E F G H SF6 Weight A B C D E F G H L SF6 Weight TG mm mm mm mm mm mm mm mm kg kg TG mm mm mm mm mm mm mm mm mm kg kg 550 5825 5030 4656 530 470 866 660 640 50 1000 800 7940 6945 6420 795 680 1055 840 790 470 90 1500 1 Primary bar 2 Aluminium alloy head 3 Terminals 4 Insulator 5 Pressure relief device 6 Densimeter 7 SF6 gas filling cock 8 Earthing screw 9 Low voltage cable entry 10 Secondary terminal box 11 Base 7

Open the catalog to page 7