General Information
24kV Indoor SF6 Switch-Disconnector FL(R)N36 Load Break Switch LBS and fuse combination appliance are suitable for power stations and industrial electrical equipment powered by three-phase AC 50Hz ring network or terminal It is used as load control line protection for 24kV power system. The load switch switches load current, closed-loop current, no-load transformer and cable charging current; the combined electrical appliance can break any current up to the rated short-circuit breaking current, and is suitable for complete sets of electrical equipment such as ring network units and box-type substations.
It is especially suitable for power distribution in urban residential areas, small secondary substations, switch offices, industrial and mining enterprises, large shopping malls, airports, subways, hospitals, stadiums and other places.
The product complies with GB3804, GB16926, IEC 60265-1 and GB16926, IEC60420 standards.
Structural Features
- Overall sealed structure: It integrates the load switch, isolating switch and grounding switch, and is sealed in an insulating box filled with SF6 gas, with a relative pressure of 0.04-0.05Mpa, and conforms to the "closed pressure system".
- Trinity function: The switch meets the three-station functions of load, isolation and grounding.
- Operation safety:
- The switch can only be in one of the "closed", "open" and "grounded" positions, and has a natural locking function to prevent misoperation.
- The switch insulation box is equipped with a safety diaphragm, which has the function of backward directional discharge and pressure relief.
c, Contains voltage indicator.
- It adopts spring operating mechanism and has stable performance.
- Excellent arc extinguishing and breaking performance:
- The rated transfer current breaking capacity of the combined appliance is 1400A.
- It has strong breaking and opening capabilities under zero gauge pressure.
- Excellent arc extinguishing performance of SF6 gas.
- Long electrical life.
- Excellent insulation performance:
a, SF6 gas has excellent insulation properties.
- The insulating box is made of epoxy resin automatic pressure gel technology (APG), which has high strength, good insulation performance and large margin.
- Excellent sealing performance, relative annual air leakage rate ≤0.5%.
- The modular design of the switch makes the structure more compact. The same switch is suitable for different applications and is easy to install.
- Installing an electric mechanism can realize the "three remote" functions.
Operating Mechanism
- The switching of the switch is realized through the operating mechanism. The mechanism spring stores energy in advance. During operation (manual or electric), the spring releases the energy after the mechanism passes the dead center, driving the switch to close or open the contacts. Therefore, the opening and closing speed of the switch is determined by the characteristics of the operating machine itself and has nothing to do with the operator's operation speed.
- K-type operating mechanism or A-type operating mechanism can be selected depending on whether it has a fuse or not.
Usage Environment
- Ambient air temperature: upper limit +40ºC, lower limit -15ºC.
- Environmental humidity: The daily average relative humidity is not greater than 95%, and the monthly average relative humidity is not greater than 90%.
- Altitude: The maximum altitude of the equipment installation site is 2000m.
- Earthquake: The earthquake intensity does not exceed 8 degrees.
- There is no serious pollution in the surrounding air, such as dust, smoke, chemical corrosives, flammable gases, gasoline and salt agents, etc.
- When the operating environment conditions are different or there are other requirements, consultation with the manufacturer is required.
Appearance Size One (Phase Distance 230mm)
Appearance Size Two (Phase Distance 275mm)
Arc Extinguishing and Breaking Principle
SF6 gas has good arc extinguishing performance. In order to extinguish the arc quickly, when the switch is breaking the current, an arc will be generated when the moving and static contacts are just separated. At this time, due to the magnetic field of the permanent magnet, the arc will be driven to move quickly, causing the arc to It is elongated and continuously combined with SF6 gas to be quickly dissociated and cooled. It is extinguished when the current crosses zero. The double fracture opening distance has the insulation level of isolating the fracture. Permanent magnet rotating arc principle, small operating power, strong extinguishing ability, light contact burn, and extended electrical life.
Switch Cabinet Display
Installation and Debugging
- Before installation and debugging, be sure to read the instruction manual carefully and make the following preparations: First, check whether there is any damage to the appearance. Damaged products should be stopped immediately. The second step is to remove contamination on the surface of the product due to transportation or other reasons.
- When the operating mechanism and the switch body are assembled, it must be ensured that they are reliably fixed, and their connecting parts should be reliably fixed on the operating shaft of the switch body, and the components connecting the load switch should also be reliably fixed on the switch body. on the switch.
- After the installation is completed, confirm that the load switch is in the opening position, insert the operating handle into the grounding operating hole on the upper end of the panel, and turn the handle 180 clockwise. To perform ground closing, rotate the handle 180 degrees counterclockwise. Complete the closing of the grounding switch.
- When performing the closing operation, first confirm that the load switch is in the opening position, then insert the operating handle into the load switch operating hole at the lower end of the panel, and rotate the operating handle 180″ clockwise to complete the closing operation of the load switch.
- During the process of moving the load switch from the closing position to the opening position, use the K-type operating mechanism, insert the operating handle into the operating hole of the load switch, and rotate the handle counterclockwise 180″ to perform the opening operation; for the A-type operating mechanism, Operating mechanism, press the opening button to open the load switch, check through the observation window whether the position of the switch is correct, and whether the corresponding observation instructions meet the requirements.
- Note: The grounding or load can only be closed when the switch is in the open position!
Maintenance and Care
Under normal use conditions where the environment meets the requirements of the installation and operation instructions, the switch body is guaranteed to be maintenance-free for 20 years. Due to environmental differences, necessary inspection and maintenance work on the load switch is still required.
- According to the working environment, conduct appropriate visual inspection of the insulation cover between June and December, and remove dirty and damp surfaces.
- Carry out lubrication and operation inspection of the operating mechanism 1 to 2 times a year to ensure normal operation.
- For load switches equipped with pressure gauges, the readings of the pressure gauges should be checked from time to time.
- When a fault current passes through the load switch fuse combination appliance and one phase fuse blows, all three phase fuses must be replaced. When replacing, the grounding switch must be closed first before replacement, and ensure that all three-phase fuses are installed in place.
Special Customization
The above parameters are typical data; if the existing styles do not meet your specific demands, please contact us for a custom design.We have significant personalized customization development and production skills, allowing us to provide tailored solutions to customers all over the world.
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