Light burned magnesia powder does not burn at all. It can run continuously for a long time at 250 ℃, and can maintain normal operation for 30 minutes at 1000 ℃ limit state without causing fire source. Even in the case of flame barbecue, as long as the flame temperature is lower than the melting point temperature of copper, lightly burn magnesium powder, and the cable can still be used without replacement after the flame is eliminated. It will not produce toxic smoke and gas when grilled by flame.
2. Strong overload protection capability
When the line is overloaded, as long as the heating cannot reach the melting point temperature of copper, the cable will not be damaged. Even if it breaks down instantaneously, the crystal at the breakdown will not form carbide. After the overload is eliminated, the cable performance will not change and can continue to be used normally.
3. High operating temperature
Since the melting point temperature of the insulating layer crystal is much higher than that of copper, the maximum temperature for long-term normal operation of the cable can reach 250 ℃, and the cable can continue to operate normally at a melting point temperature close to 1083 ℃ of copper in a short time.
4. Good anti-corrosion and explosion-proof performance
Because seamless copper pipe is used as sheath, light burned magnesium powder has the properties of waterproof, moisture, oil and some chemical substances. Copper pipe has considerable mechanical strength, so it has good explosion-proof performance.
Light burned magnesia powder
5. Long service life
Magnesium oxide cables are all made of inorganic materials, so there is no insulation aging, and the service life can reach more than 3 times that of ordinary cables.
6. Flexible laying
Magnesium oxide cable can be laid on the bridge with ordinary cable, and special support can also be used for open laying, which is more flexible than ordinary cable laying, saves the investment of cable bridge and reduces the overall cost of the project.
2、 Disadvantages of light burned magnesia powder
Everything has two sides, and light burned magnesium ball is no exception. It has many advantages, but also has some disadvantages, which should be paid attention to in selection and construction.
1. High investment cost
As the outer sheath of magnesium oxide cable is composed of seamless copper pipe, the overall copper content is much higher than that of ordinary cable. At the same time, the construction process of magnesium oxide cable requires higher equipment than that of ordinary cable, resulting in the price of magnesium oxide cable being about 30% higher than that of ordinary cable.
2. Joints are susceptible to moisture
The insulating layer is composed of minerals. It is very easy to react with water in the air to produce conductive magnesium hydroxide. During the construction of cable head, when the exposed conductor is stripped from the cable end, the insulation resistance of the cable is generally more than 10m Ω. However, if the cable head is not fabricated within 1 hour, the insulation resistance can be reduced to less than 10m Ω, or even to less than 0.5m Ω. If the outer layer is not scratched, and the sealing and moisture-proof treatment is not found in time, the insulation value will drop quickly and gradually to 0, This will make the cable unusable.
3. Difficult construction
The hardness of light burned magnesia powder is higher than that of ordinary cables, and its weight is about twice that of ordinary cables. It is not easy to achieve the visual effect of parallel and neat during laying, and it is difficult to find fault points due to long lines and many joints. Therefore, it is difficult to construct and bend in and out of distribution boxes and bridges.
4. Large construction workload
All light burned magnesia powder specifications exceeding 35mm are single core cables, such as a 70mm cable, and ordinary cables only need 3 × 70+2 × 35 five conductors can be in the same outer sheath, and magnesium oxide must be assembled from three 70mm plus one 35mm single core cable to reach the same specification. The delivery length of single core cable is short, for example, the delivery length of 240mm cable is 69m. If the laying distance is long, a large number of intermediate joints will be made, which will double the construction workload
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