I. Overview   

FLN36-12 sulfur hexafluoride load switch is a double-break rotary load switch using SF6 gas as the insulating and arc-extinguishing medium. It is suitable for 10KV power distribution systems. Each switch is permanently sealed after being filled with 0.4bar pressure SF6 gas. The switch can be installed vertically or horizontally. The typical installation method in the ring main unit is to install a steel partition horizontally between the cable room and the busbar room. This installation method isolates the busbars from the cable joints to comply with the most stringent safety requirements for operation and maintenance.As the country continues to deepen the transformation and construction of urban and rural power grids, the demand for load switches, ring main units, small switching stations and box-type substations across the country is also increasing. In view of this, our company began to research, develop and produce a FLN36-12 SF6 load switch with stable performance, high technical parameters, fully insulated, fully sealed and maintenance-free in 2000. On this basis, we designed the current top unit and bottom unit of the SF6 load switch high-voltage module, which are suitable for national conditions in terms of price and can completely replace imported products in terms of performance. The sulfur hexafluoride load switch produced by Daya Electrical Appliance Group has many advantages such as simple structure, maintenance-free and reasonable price, and is deeply favored by the market. Daya Electric Group company has users in more than 30 provinces and cities in China except Tibet and Taiwan: in Beijing, Shanghai, Tianjin, Chongqing, Guangzhou, Chengdu, Shenyang, Wuhan, Xi'an, Hunan, Zhejiang, Jiangsu, Shandong, Shanxi and other places Widely used and unanimously praised by users.      

2.Model and meaning

3. Indoor usage environment

 a)Ambient temperature

Maximum temperature: +40℃ Minimum temperature: -15℃

 Daily average: ≤35℃

 environment humidity:

 Daily average relative humidity: ≤95% Monthly average relative humidity: ≤90%

 Daily average vapor pressure: ≤2.2×10-3Mpa?? Monthly average vapor pressure: ≤1.8×10-3MPa

 b) Altitude: no more than 1000m;

c) The earthquake intensity does not exceed 8 degrees;

d) There should be no dripping water, no frost, no condensation, no flammable and explosive hazards, no chemical corrosive gases, and no severe vibrations in the use place.

Structural features

◆FLN36-12 load switch adopts double-break, rotary movable contacts and has the following three states: closing; opening; grounding.

◆ The load switch uses SF6 as arc extinguishing and insulating medium. The switch is sealed by an upper and lower shell cast by epoxy resin and has good insulation performance.

◆ If arcing occurs inside, there is a structural weak point at the rear of the casing, which will be flushed open. Then the arc vent valve on the cabinet will be flushed open and the overpressure airflow will be directed to the outside of the cabinet, with good safety performance.

◆Each load switch is sealed and maintenance-free for life.

◆ The relative pressure of SF6 gas in the load switch is 0.045Mpa.

◆ The mechanical life of the load switch is 5000 times closing - opening and 2000 times opening - grounding.

◆ FLN36-12 type load switch and operating mechanism are placed in the detachable upper unit, which can easily change the load switch cabinet into a load switch + fuse combination electrical cabinet, or change the load switch + fuse combination electrical cabinet into a load switch + fuse combination electrical cabinet Load switch cabinet.

◆ Operating mechanism

◆ FLN36-12 is equipped with K-type operating mechanism, referred to as incoming switch. It has a three-position interlocking function; the main switch can be opened or closed 

   manually or electrically; the grounding switch can be opened or closed manually; it has mechanical position indication of the main switch and the grounding switch.

◆FLN36-12 is equipped with A-type operating mechanism, referred to as outlet switch. It has a three-position interlocking function; it can open or close the main switch manually or 

  electrically; it can trip the main switch by operating a button or tripping device; it can open or close the grounding switch manually; it is a machine with a main switch and a grounding      switch. Position indication and mechanical indication of when the fuse has blown.

Optional parts

◆ Auxiliary contacts: closing position 2 normally open - 2 normally closed; opening position 2 normally open - 2 normally closed; grounding position 2 normally open - 2 normally 

  closed

◆ Shunt trip coil: for type A Operating mechanism

◆ Mechanical trip button: used for A-type operating mechanism

◆ Electric operation: equipped with a motor drive device and a control unit, it can realize electric opening and closing operations of the load switch and guide the overpressure air flow 

  outside the cabinet.

◆The top unit of the load switch high-voltage module structurally inherits the characteristics and advantages of the past SF6 load switch products, replacing the cumbersome and                 complicated technology and services caused by separately supplying the switch body, operating mechanism, interlocking parts and other parts under the old model. Work. Fundamentally, product completeness, standardization and modularization are taken into consideration. The top unit is composed of FLN type load switch, A/K type operating mechanism, basic coupling device and tripping device, fixed steel plate frame and panel, and has been fully adjusted in function. Standardization during installation and overall safety of operators and equipment 

operation are ensured. If a line fault generates excessive current and causes arcing inside the switch, there will be a structural weak point at the rear of the casing that will be flushed open. Then the arc vent valve on the cabinet will be flushed open and the overpressure airflow will be directed out of the cabinet.