High-Voltage Load Break Switch FLN36 (12-40.5KV) - SF6 Insulated, China Suppliers & Factory Direct Sales
Model meaning
Normal service condition
When the load break switch is used at an altitude of more than 2000 meters, it needs to be specially noted so that the design scheme can be adjusted during manufacturing.
(At present, the load break switch manufactured by the company has a precedent of safe operation at an altitude of about 3,000 meters)
Structural principle
FLN36-12D load break switch main circuit and ground circuit are sealed in the epoxy resin made of APGl art cast insulation shell, with good insulation performance, anti-pollution environment and other advantages. The insulation shell is composed of the upper and lower insulation covers and is filled with SF6 gas with a relative pressure of 0.4bar. The lower insulation cover has explosion-proof measures to ensure that the overpressurized SF6 gas is directly sprayed into the rear channel of the cabinet in case of an accident, ensuring personal safety.
Arc-extinguishing principle
SF6 gas has good arc extinguishing performance. In order to extinguish the arc quickly, the switch generates an arc when the static and static contacts are just separated during the process of breaking the current. At this time, due to the magnetic field of the permanent magnet, the arc is driven around the static and static contacts to rapidly dissociate and cool, and is extinguished when the current is over zero. This permanent magnet rotating arc principle has strong extinguishing ability, light contact burn, and prolongs electrical life.
Structural characteristics
The load break switch and the combined appliance are composed of the same insulated body switch body, the same spring operating mechanism, the fuse contact holder and the fuse action impact trip system. The load break switch of the front connector of the touchable cable is composed of a special insulated body switch body and a general spring bath moving mechanism.
The upper and lower body is injected by epoxy resin to form an inflatable inner cavity. The rotating movement of the public moving contact can complete the three working states of "make-break-ground" in order. The electric closing and opening can be installed on the basic hand spring energy storage operating mechanism to achieve remote control operation for users to choose.
The front of the mechanism box is provided with SF6 gas pressure gauge and position indication. The pressure gauge is used to monitor SF6 gas pressure changes. The position indicating device is directly connected with the driving shaft of the moving contact, and the working position of the indicating moving contact is absolutely reliable.
The rear part of the body is equipped with a safety diaphragm to meet the requirements of the pressure system, and has the function of pressure release and escape. When some kind of accident may occur in the arc extinguishing room, the pressure is too high. Overpressurized gas can break through the diaphragm and be released. The gas is sprayed directly to the rear, avoiding forward injection or other phenomena, thus ensuring personal safety.
The load break switch and the ground switch, the ground switch and the front door (the switch has this interlock for cabinet allocation) have reliable mechanical interlocks.
Order instructions
The order should indicate:
Technical parameter
| Item | Unit | Argument | ||
|---|---|---|---|---|
| Rated voltage | kV | 12 | 24 | 40.5 |
| Rated frequency | Hz | 50/60 | ||
| Rated current | A | 630 | ||
| 1min power frequency withstand voltage, relative ground, phase/fracture | kV | 42/48 | 65/79 | 95/110 |
| Lightning impulse withstand voltage(peak) relative to ground, phase/fracture | kV | 75/85 | 125/145 | 185/215 |
| Main circuit rated heat stable current | kA/3s | 20 | ||
| Rated heat stable current of ground loop | kA/2s | 20 | ||
| Rated dynamic stable current(peak) | kA | 50 | ||
| Rated short-circuit closing current | kA | 50 | ||
| Rated closed-loop breaking current | A | 630 | ||
| Rated active load breaking current | A | 630 | ||
| Rated cable charging breaking current | A | 10 | ||
| Rated short-circuit breaking current | kA | 20 | ||
| Rated transfer current | A | 1750 | 1400 | 1000 |
| Mechanical life load break switch/ground switch | Time | 3000/2000 | ||
| SF6 gas pressure (relative pressure at 20℃) | Mpa | 0.045 | ||
12kV profile and mounting dimensions
Technical requirement:
24kV profile and mounting dimensions
Technical requirement:
35kV profile and mounting dimensions
Technical requirement:
Frequently Asked Questions (FAQ)
The switch is designed to operate under a maximum ambient temperature of +40℃ and a minimum temperature of -40℃.
Yes. Although the standard design is for altitudes ≤2000 meters, special adjustments can be made during manufacturing for higher altitudes. The switch has a proven record of safe operation at altitudes of approximately 3,000 meters.
The switch utilizes SF6 gas for arc extinguishing. It works on a permanent magnet rotating arc principle where the magnetic field drives the arc around the contacts to rapidly cool and extinguish it at zero current crossing.
The switch uses an epoxy resin APG cast insulation shell. The lower cover features explosion-proof safety diaphragms. In case of accidental overpressure, the gas breaks through the diaphragm and is safely directed toward the rear channel of the cabinet.
Yes, even when the SF6 gas pressure in the switch drops to zero gauge pressure, the load switch is still capable of operating at its rated current.