Customization: | Available |
---|---|
Breaking Capacity: | High Voltage Circuit Breakers |
Operation: | Electric Type |
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SFG is an SF6 insulated three-position (close, open, earth on) switch disconnector. All electrically
active parts, including the earthing switch, are in robust epoxy resin housings filled with SF6 (1.45 bar). SFG is a virtually maintenance-free, sealed-for-life (30 years) SF6 unit. Simple and reliable mechanisms in a stainless steel enclosure offer high mechanical endurance. For the SFG, 1000 close/open and 1000 open/earth operations are guaranteed.
mechanism
There are two types of operating mechanisms:
the single spring type and the double spring type. Motor can be added to both types of operating mechanisms.
Single spring operating mechanism uses one disc spring to operate load break switch's opening, closing and earthing. Normally, it does not need maintenance.
Double spring operating mechanism uses two disc springs. K spring is used to operate load break switch's opening, closing and earthing. And A spring is used for load break switch tripping.
standards
SFG load break switches meet the following standards:
IEC 60265-1
IEC 60694
IEC 60129
IEC 60420
IEC 60282-1
IEC 62271-102
IEC 62271-105
Item | Unit | Data | ||
Rated voltage | KV | 12 | 24 | |
Rated frequency | HZ | 50/60 | ||
Rated current | A | 630 | ||
Rated load breaking current | A | 630 | ||
Rated cable charging breaking current | A | 10 | ||
Rated short circuit making current | KA | 50 | ||
Peak withstand current | KA | 50 | ||
Rated short circuit withstand current | KA | 20 | ||
Rated short circuit duration | S | 3 | ||
Power frequency withstand voltage | Between phases, phase towards ground | KV | 42 | 50 |
Across isolation distance | 48 | 60 | ||
Lightning impulse withstand voltage | Between phases, phase towards ground | KV | 75 | 125 |
Across isolation distance | 85 | 145 |
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