HPA - BREAKER
1.1 Data
* Rated voltage kV 12 24 36
* Rated current A 1250, 1600, 1250, 2000, 1250,
2000, 2500, 2500 1600,
3000 2000
* Rated breaking current kA 40 26.3 26.3
* Rated making current (peak) kA 100 66 66
¨ Short time rated current, 1/3 sec kA 40 26.3 26.3
¨ Sf pressure, (over pressure) bar 2.5 2.5 2.5
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¨ Electrical endurance, (number of
interruptions at rated breaking current) No 6 25 10
¨ Mechanical endurance (number of
interruptions at rated current) No 10000 10000 5000
With maintenance as detailed in this manual.
2.2 Construction and function
The circuit breaker type HPA operator on the puffer principle.
2.2.1 Breaker poles
The breaker pole contains Sf gas (sulphur hexafluoride). This gas in many
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respects is one of the best media for circuit breaker in use for several decades
and its excellent performance is demonstrated by experience.
(3)
Fig - 1
Structure of SF molecule
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