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1.1
Data
* Rated voltage
* Rated current
* Rated breaking current
* Rated making current (peak)
Short time rated current, 1/3 sec
Sf pressure, (over pressure)
6
Electrical endurance,
interruptions at rated breaking current)
Mechanical endurance
interruptions at rated current)
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
respects is one of the best media for circuit breaker in use for several decades
and its excellent performance is demonstrated by experience.
HPA - BREAKER
kV
A
kA
kA
kA
bar
(number of
No
(number of
No
6
Fig - 1
Structure of SF molecule
(3)
12
24
1250, 1600, 1250, 2000, 1250,
2000, 2500, 2500
3000
40
26.3
100
66
40
26.3
2.5
2.5
6
25
10000
10000
6
36
1600,
2000
26.3
66
26.3
2.5
10
5000
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