SF6 Load Break Switch SF6 LBS 35KV VCB For RMU Panel
Brand Name:KNKONG
Certification:CCC,ISO9001,CE, CB,IEC60898
Model Number:SF6
Minimum Order Quantity:1
Delivery Time:15 working days
Payment Terms:L/C, T/T, Western Union
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Location:
Zhengzhou Henan China
Address:
No. 25 Street , Hanghai Road, Zhengzhou,Henan,China
Supplier`s last login times:
within 11 hours
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Product Details
SF6 Load Break Switch SF6 LBS 35KV VCB For RMU Panel
Product Introduction
The SF6 load switch is a switchgear with a rated voltage of 12KV. It uses SF6 gas as the arc extinguishing and insulating medium. There are three positions for closing, opening and grounding inside the switch. It has small size, easy installation and use, and strong environmental adaptability.
Physical properties
SF6 is a relatively heavy gas. Under the same conditions, its
density is 5 times that of air. The relationship between pressure
and temperature follows the ideal gas law. The critical temperature
is the highest temperature at which SF6 gas liquefies, and the
critical pressure represents the gas pressure required for
liquefaction at this temperature. SF6 can remain gaseous only when
the temperature is higher than 45℃. Under normal conditions of use,
it has the possibility of liquefaction, so SF6 cannot be used at
too low temperature and too low pressure.
Electrical characteristics
SF6 is a medium with high dielectric strength. Under a uniform
electric field, the dielectric strength of SF6 is about 2,5~3 times
that of air at the same pressure, and its dielectric strength is
equivalent to that of transformer oil at 3 atmospheres. Practice
has proved that mixing a small amount of sulfur hexafluoride gas in
the air significantly increases the insulation strength of the air;
on the contrary, adding a small amount of air to the sulfur
hexafluoride gas will significantly reduce the insulation strength
of the sulfur hexafluoride gas. Due to the high dielectric strength
of SF6, for circuit breakers with the same voltage level and
similar breaking current, the number of SF6 series fractures is
less. For example, the LR-220 SF6 circuit breaker developed in my
country has a single fracture voltage of 220KV. ; Another example
is the 500KV oil-less circuit breaker with 6 to 8 fractures, while
the SF6 circuit breaker has only 3 to 4 fractures. The corona onset
voltage of SF6 is much higher than that of air, and the dielectric
strength has nothing to do with the frequency of the applied
voltage. However, attention should be paid to the uniformity of the
electric field, impurities, the shape and irregularity of the
electrode, etc., and the dielectric strength of SF6 The intensity
has a certain intensity. The moisture in SF6 gas will affect the
insulation. When the water content in SF6 exceeds a certain
concentration, SF6 may decompose at a temperature above 200°C. The
decomposition product contains hydrofluoric acid, which is a highly
corrosive and highly toxic acid. In addition, moisture condensation
is also harmful to edge insulation. Therefore, in SF6 electrical
equipment, the moisture content should be strictly controlled.
SF6 Load Break Switch SF6 LBS 35KV VCB For RMU Panel
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