FLN36-12kV SF6 load break switch is a switch equipment for medium voltage switchgear, using SF6 gas as arc extinguishing and insulating medium. There are three working positions: open, closed, earth position in the switch. The compact size, easy installation, and fine adaptability to environment make the switch suitable for many different applications.
It can be divided into two types: FLN36-12D ( K type single spring operating mechanism ), FLRN 36-12D (A type double spring operating mechanism). The latter type could be equipped with fuse combination, having control and protecting function, which can be used for power supply and substation as a protecting and control device, especially suitable for ring main unit, cable distribution box and switching substation.
Basic functions and features:
1.Load breaker switch adapts double fracture, rotary movable contact structure, with the following three kinds of operating states: Closing,opening,earthing.
2.Using SF6 gas as an arc extinguishing and insulating medium, the main circuit seals by the upper and lower housing pouring epoxy resin, the conductive function is unaffected by external influences.
3.Good safety performance. If internal arcing occurs, the housing has an internal structure weak point, it will be rushed to open, followed by the cabinet above the shutter release arc red open air overpressure stream-oriented outside the cabinet, ensure that the switch cabinet security checks.
4.Load breaker switch sets gates, opening, earthing switch three at one, filled with SF6 gas encapsulated in epoxy resin housing, three-position interlock,compact structure,high security and reliability.
5.Small size, light weight, maintenance-free, easy and safe to operate.
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Item
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Unit
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Data
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|
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FLN36-12D/T630-20
Load break switch
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FLRN36-12D/125-50
LBS + Fuse-combination units
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||
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Rated voltage
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kV
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12
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12
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Rated frequency
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Hz
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50
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50
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Rated current
|
A
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630
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125
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Short-duration(1min) power frequency withstand voltage
|
kV
|
42
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42
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Lightning impulse withstand voltage
|
kV
|
75
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75
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Rated power frequency withstand voltage(5min)
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kV
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24
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24
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Rated short-time withstand current(Load break switch/3s)
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kA
|
20
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20
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Rated short-time withstand current(Earthing switch/2s)
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kA
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20
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20
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Rated peak withstand current(Load break switch)
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kA
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50
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50
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Rated peak withstand current(Earthing switch)
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kA
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50
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50
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Rated short-circuit making current(Load break switch)
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kA
|
50
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125
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Rated short-circuit making current(Earthing switch)
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kA
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50
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50
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Rated closed-loop dropout current
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A
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630
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|
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Rated active load breaking current
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A
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630
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|
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Rated cable-charging breaking current
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A
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10
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10
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Rated short-circuit breaking current
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kA
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50*
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Rated transfer current
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A
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1750*
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Fuse type
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|
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XRNT-12kV/125A*
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Fuse impact output energy
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J
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1±0.5
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Mechanical endurance LBS/Earthing switch
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Time
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5000/2000
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5000
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Air insulation distance of charged body and ground
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mm
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≥ 125
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≥ 125
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SF6 Gas pressure(Relative pressure at 20℃ )
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bar
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0.4
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0.4
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Opening and Closing simultaneity
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ms
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≤ 2
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≤ 2
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Main circuit resistance
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μΩ
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≤ 65
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≤ 65
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1. Altitude: ≤1000m
2. Ambient temperature at -30ºC to +40ºC, the daily average temperature should not more than 30ºC.
3. The daily average of relative humidity is less than 95%, the average monthly is less than 90%.
4. Working environment should be without steam, gas, chemical corrosive deposition, salt fog, dust, dirt and other dangerous explosive media, which will severely impact on insulation and conductivity of products.
5. Working environment should not be regular vibration or serious bumps.
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