SF6 Circuit Breaker (GIS)

Construction

A triple-pole 8D.2 breaker is illustrated in Fig. (1) for example Used in 132 KV

Each breaker pole consists of a chamber 11. Containing an interrupter unit 22. Fig (1) an adapter housing 15. And an operating mechanism 14. Complete with oil tank 14.3.

The breaker chamber is sealed gas-tight by two bushings 29. Fig (2- Next page). the breaker thus forms an independent gas filled compartment.

The gas pressure in the breaker poles is indicated by a gauge in the control and monitoring unit and is monitored by a density monitor. www.sayedsaad.com

The control and monitoring unit is installed in the control cubicle. It contains the pump set, all the devices for electrical and hydraulic control and monitoring of the breaker poles and also the terminal blocks.

The operating energy is produced by compressing nitrogen in a storage cylinder 13. Fig (1) each pole is fitted with a rupture diaphragm 11.3 fig (2- Next page) as a protection against unduly high gas pressure.

A static filter 11.31 fig (2- Next page) is fitted in the breaker chamber. Its purpose is to absorb SF6 decomposition products and to keep the SF6 dry. Each pole rests on a ball-type support 11.4. Fig (2- Next page) in this way, the flanged joints of the modular assemblies is relieved of strain. A section through a breaker pole is shown in Fig (10)


 

 Fig (1) Type 8D.2 breaker

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11. Breaker chamber

11.4 support.  www.sayedsaad.com

13. Hydraulic storage cylinder

14. Operating mechanism

14.3 Oil tank

15. Adapter chamber

22. Interrupter unit.

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Each breaker pole consists of a chamber 11. Containing an interrupter unit 22. Fig (1) an adapter housing 15. And an operating mechanism 14. Complete with oil tank 14.3.

The breaker chamber is sealed gas-tight by two bushings 29. Fig (2- Next page). the breaker thus forms an independent gas filled compartment.

The gas pressure in the breaker poles is indicated by a gauge in the control and monitoring unit and is monitored by a density monitor.

The control and monitoring unit is installed in the control cubicle. It contains the pump set, all the devices for electrical and hydraulic control and monitoring of the breaker poles and also the terminal blocks.

The operating energy is produced by compressing nitrogen in a storage cylinder 13. Fig (1) each pole is fitted with a rupture diaphragm 11.3 fig (2- Next page) as a protection against unduly high gas pressure.

 A static filter 11.31 fig (2- Next page) is fitted in the breaker chamber. Its purpose is to absorb SF6 decomposition products and to keep the SF6 dry. Each pole rests on a ball-type support 11.4. Fig (2- Next page) in this way, the flanged joints of the modular assemblies is relieved of strain. A section through a breaker pole is shown in Fig (2- Next page)