The outdoor switch cabinet is generally composed of cabinet body, switch (circuit breaker), protection device, monitoring device, electric energy meter and other secondary components. Outdoor Switchgear is installed in power stations, substations and power customers with large power consumption. At present, the outdoor low-voltage switchgear is generally made of metal materials. However, in the process of long-term use, the metal material outdoor low-voltage switchgear has the following problems:
(1) it is conductive and has potential safety hazards;
(2) Poor corrosion resistance and short service life;
(3) The box is seriously stolen, threatening public safety and increasing the use cost;
(4) The coating is easy to peel off due to serious corrosion, which seriously affects the beauty of the environment.
The new non-metallic SMC FRP composite outdoor low-voltage switchgear is a new FRP composite Outdoor Switchgear developed by Ningbo Huayuan according to the market demand. It is a good substitute for the traditional metal switchgear, especially suitable for the outdoor switchgear with high requirements. The new non-metallic SMC FRP composite outdoor low-voltage switchgear has the following advantages:
strong aging resistance, and the service life can reach 30 years;
It does not rust and does not need to be regularly coated with antirust paint for maintenance, so it is maintenance free;
It has strong anti pollution ability and can be used in places with high salt density, such as the seaside and places with high pollution level, which is not easy to generate surface discharge;
Strong impact resistance, not easy to damage;It is made of non-metallic materials, so it will not be stolen, beautify the environment and have good social effect;
Non metallic materials, with good insulation performance, are not easy to cause electric shock or leakage accidents. The new non-metallic SMC FRP composite outdoor low-voltage switchgear cabinet body is produced by SMC composite molding process.
Sheet molding compound (SMC) is a kind of sheet fiber reinforced thermosetting composite. SMC composites are fiber-reinforced thermosetting composites with polyester resin, chopped glass fibers, fillers and auxiliary materials wrapped in upper and lower plastic films. Glass fiber reinforced plastic composite electrical switchgear cabinet body SMC composite has the following advantages:
1. Good electrical performance
The fiber reinforced polyester Ningbo Huayuan SMC composite used for manufacturing electrical products has the following electrical properties:
Insulation resistance (immersed in water for 24h): 1.0x10 m Ω
Arc resistance: 180s
Tracking index of leakage resistance: ≥ 600V
Insulation protection and anti creepage index shall comply with relevant din/vde standards. This material not only has excellent electrical insulation, but also can maintain good dielectric properties at high frequency. It is not affected by electromagnetic effect and does not reflect electromagnetic waves. These properties are far superior to those of non-metallic materials.
2. Chemical resistance
Fiber reinforced polyester Ningbo Huayuan SMC composites have good corrosion resistance characteristics such as acid, dilute alkali, salt, organic solvent and seawater, while metal materials are not resistant to acid and seawater corrosion.
3. Light weight and high strength
The specific strength and specific modulus are one of the indicators to measure the bearing capacity of materials. The specific modulus of fiber reinforced polyester SMC composites is equivalent to that of steel, but its specific strength can reach 4 times that of steel.
4. Good fatigue resistance
The tensile strength of fiber-reinforced polyester Ningbo Huayuan SMC composite is slightly better than that of steel. The fatigue resistance limit of steel and most metal materials is 40% -50% of its tensile strength, while the fatigue resistance limit of fiber-reinforced composite is generally higher than this value, * as high as 70% -80%.
5. Notch sensitivity
When the component is overloaded and a small amount of fiber is broken, the load is quickly distributed on the undamaged fiber to reach the mechanical balance again. This is not comparable to metal components.
6. Low thermal conductivity and low expansion coefficient
When there is a temperature difference, the thermal stress is much smaller than that of metal.
7. Excellent UV resistance and aging resistance
Among the non-metallic materials, fiber reinforced polyester SMC composites have good aging resistance. The anti-aging performance test shows that the surface aging thickness is less than 50 μ m after 20 years in different places and climatic zones. The small thickness of most boxes is 5mm, which is less than 1% of the box thickness, so it has no obvious impact on the mechanical properties of the box. In addition, our company has adopted a special UV resistant surface treatment process to further strengthen its aging resistance.
8. Long service life
The use history of Europe can prove that its service life is at least 20 years; The simulated aging test shows that its service life is more than 20 years, which is far more than that of traditional materials such as metal.
9. Flame retardant, smokeless and non-toxic
This material is a flame retardant material with a flame retardant grade of fv0 (non-metallic material * advanced), a smoke emission grade of 15 (smoke level 1-100) under high temperature burning, and a non-toxic smoke with a toxicity grade of za1 (quasi safety level 1).
Ningbo Huayuan can use this material to make box modules of different shapes through molding process. The SMC outdoor electrical switchgear cabinet assembled with SMC box modules is applied in the outdoor power equipment manufacturing industry, replacing the metal switchgear cabinet widely used in the current outdoor power equipment manufacturing industry. Performance characteristics of SMC FRP composite switch cabinet:
● material and treatment - the box is made of SMC composite material and molded at high temperature. The surface of the box is flat and smooth, the color is uniform, and it is not easy to scratch.
● good sealing performance, safe and reliable, easy to use -- the box can be opened from front to back, which is easy to operate and maintain. The box door adopts a three-point positioning door lock. The lock cylinder has waterproof protection, and is sealed with a concave sealing strip. It is safe and reliable, and the protection performance meets the requirements of gb4208-ip65. It can effectively prevent rainwater immersion and has all-weather protection function.
● high mechanical strength and good flame retardancy - the box body is made of SMC composite material, which has light specific gravity, high mechanical strength and good flame retardancy. The box door adopts longitudinal full-length hinge, which is not easy to deform and has good interchangeability.
● corrosion resistance, aging resistance, and strong electrical insulation - the box has good corrosion resistance, aging resistance, high voltage protection performance, and strong electrical insulation, and can adapt to various harsh environments such as strong acid and alkali.
● high temperature resistance and anti condensation - due to the use of SMC composite materials, the box has the thermal insulation performance that metal materials cannot match.
● there are knockdown cover plates for incoming and outgoing lines at the bottom, which can be equipped with sealing rings to meet the requirements of customers.
