Load Break Switch (FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)

Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
Load Break Switch <small>(FLN38-12/FLN38-24 SF6 Gas Insulated Load Break Switch)</small>
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  • FLN38-12 SF6 Load Break Switch
  • FLN38-24 SF6 Load Break Switch

Introduction
Economy, security and reliability come together in our FLN38-12/FLN38-24 SF6 load break switch, which is our newly developed disconnect switch that applies to XGN15 RMU. It comes with simple structure and reliable interlock, being easy for mounting and operating.

Structure
The SF6 gas insulated load break switch has the main circuit and the earthing circuit sealed in an epoxy resin based dielectric casing, which is excellent in insulating performance and contamination resistance. The casing is composed of the upper and lower insulating covers, cast together by APG technology. Its inner chamber is filled with SF6 gas in relative pressure of 0.4bar. The wall of the lower insulating cover is locally thinner, as a measure taken to prevent explosion. In case of accident, the over pressured SF6 gas can break through the explosion-proof channel and jet directly to the rear of the cabinet, release the pressure and ensure personal safety.

Our FLN38 series gas insulated load break switch adopts arc chute structure, which enables quick and reliable arc quenching. The interrupter switch is available in FLN38 series (K-type single-spring operating mechanism) and FLRN38 series (A-type single-spring operating mechanism). The FLRN38 type can be combined into a load break switch fuse unit, which has control and protection functions.

A. Closing position
B. Isolated position
C. Earthing position
1. Upper insulating cover
2. Upper stationary contact
3. Spindle
4. "M" ring
5. Lower insulating cover
6. Sensor
7. Lower stationary contact
8. Arc chute
9. Movable contact
10. Ground coupler
11. Ground contact

Service Conditions
1. Ambient temperature
Highest temperature: 40 ℃
Lowest temperature:-40 ℃
2. Humidity: maximum average relative humidity
Daily average: ≤ 95%
Monthly average: ≤ 90%
3. Seismic capacity: 8 degrees
4. Altitude: ≤ 2000 m

Technical Parameters

FLN38-12 SF6 Gas Insulated Load Break Switch
No.ItemUnitValue
FLN38FLRN38
1 Rated voltageKV 12
2 Rated frequencyHz 50
3 Rated currentA 630 125
4 Rated insulation
level
Lightning impulse withstand voltage (peak)KV 75 (phase-to-phase, phase to earth),
85 (fracture)
1 min power frequency withstand voltage KV 42 (phase-to-phase, phase to earth),
48 (fracture)
5 Auxiliary circuit 1min power frequency withstand voltageV 2000
6 Rated short-time withstand current /
duration (earthing switch included)
kA/s 25/2
7 Rated peak withstand
current
Main switch, earthing switchKA 63 125
8 Rated short-circuit
breaking current
Main switch, earthing switchA 63 125
9 Rated breaking currentRated active load breaking currentA 630
Rated closed circuit breaking currentA 630
No-load transformer capacitykVA 1250
Cable charging currentA 10
10 SF6 gas rated inflation pressure (20 ℃gauge pressure)
MPa 0.045 ± 0.005
11 SF6 gas yearly leakage rate per year ≤1%
12 Mechanical life (load switch) times5000
Mechanical life (earthing switch) times 2000
13 Moisture PPm ≤ 150
14 Pole-center distancemm 210 ±2
15 Different period of three-phase closingms ≤ 10
16 Different period of three-phase openingms ≤ 15
17 Main circuit resistanceμ Ω ≤ 65
FLN38-24 SF6 Gas Insulated Load Break Switch
No.ItemUnitValue
FLN 38 FLRN 38
1 Rated voltageKV 24
2 Rated frequencyHz 50
3 Rated currentA 630 125
4 Rated insulation
level
Lightning impulse withstand voltage (peak)KV 145 (phase-to-phase, phase to earth),
125 (fracture)
1 min power frequency withstand voltage KV 79 (phase-to-phase, phase to earth),
65 (fracture)
5 Auxiliary circuit 1min power frequency withstand voltageV 2000
6 Rated short-time withstand current /
duration (earthing switch included)
kA/s 25/2
7 Rated peak withstand currentKA 63
8 Rated short-circuit breaking currentA 63
9 Rated breaking current Rated active load breaking currentA 630
Rated closed circuit breaking currentA 630
No-load transformer capacitykVA 1250
Cable charging currentA 10
10 SF6 gas rated inflation pressure (20 ℃gauge pressure)MPA 0.045 ± 0.005
11 SF6 gas yearly leakage rateper year≤1%
12 Breaking transfer current A / 1700
13 Short-circuit breaking currentkA / 310
14 Mechanical life (load switch) times5000
Mechanical life (earthing switch) times2000
15 Pole-center distancemm 275 ±2
16 Different period of three-phase closingms ≤ 5
17 Different period of three-phase openingms ≤ 5
18 Main circuit resistanceμ Ω ≤ 65
Operating Mechanism for SF6 Gas Insulated Load Break Switch
1. Operating mechanism (K type for incoming cabinet, A type for outgoing cabinet)

Main switch function: manual and electrical opening and closing operations are both allowed. The closing is only allowed when the earthing switch is in open state.

Earthing switch function: the opening and closing operation can only be done manually. When the main switch is in closed state, the earthing switch is not available.

Auxiliary switch:
Closing position: 2 normally open -2 normally closed;
Opening position: 2 normally open -2 normally closed;
Grounding position: 2 normally open -2 normally closed.

Mechanism indication:
Main switch and earthing switch status indication (K-type operating mechanism)
Main switch and earthing switch status indication, blown fuse indication (A-type operating mechanism)
Shunt trip coil is for A type operating mechanism.

2. Electric operation: automatic opening and closing can be achieved through motor drive and control unit. The motor operating voltage can be AC220V, DC220V, DC48V, DC24V.

Outline of SF6 Gas Insulated Load Break Switch
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