China FLN36 (12-40.5KV) Load Break Switch Suppliers - High Voltage SF6 Switch Factory
Model meaning
Normal service condition
- Ambient temperature: maximum temperature +40℃, minimum temperature -40℃
- Humidity: Maximum average daily relative humidity ≤95%, maximum average monthly relative humidity ≤90%
- Altitude: ≤2000 meters
- Seismic capacity: 8 degrees
- The surrounding air should be free from corrosive, flammable gas, water vapor and other obvious pollution, there should be no frequent violent vibration.
- Annual leakage rate: ≤0.1%
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:
- Product model, name, specification, quantity;
- Rated voltage, rated current;
- Whether it is equipped with electric operating mechanism;
- Name and quantity of spare parts and accessories;
- Special conditions of use.
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 | ||
*If you need to choose products, subject to relevant tests.
When the gas pressure in the switch is zero gauge pressure, the load switch can still operate the rated current.
12kV profile and mounting dimensions
Technical requirement
- 1, Rated voltage: 12kv
- 2, rated current: 630A
- 3, power frequency voltage: 48kv/1min no flashover and breakdown phenomenon
- 4, partial discharge: 14.4kv/<10PC
- 5, screw hole tooth type is complete, can not feed
- 6, helium leak detection rate: ≤4x10-8/ Pa m3/s
- 7, grounding induction capacitance: 6pF
24kV profile and mounting dimensions
Technical requirement
- 1, Rated voltage: 24kv
- 2, rated current: 630A
- 3, power frequency voltage: 65kv/ 1min no flashover and breakdown phenomenon
- 4, partial discharge: 26.4kv/<10PC
- 5, screw hole tooth type is complete, can not feed
- 6, helium leak detection rate: ≤ 4x10-8/Pa m3/s
35kV profile and mounting dimensions
Technical requirement
- 1, Rated voltage: 35kV
- 2, rated current: 630A
- 3, to the ground/phase frequency voltage: 70kV/1min
- 4, the fracture frequency withstand voltage: 80kV/1min
