Advantages and disadvantages of light burned magnesium powder

Light burned magnesium powder does not burn at all. It can operate continuously for a long time at 250 ℃. It can also operate normally for 30 minutes under the limit state of 1000 ℃ without causing ignition source. Even in the case of flame barbecue, as long as the flame temperature is lower than the melting point temperature of copper, the magnesium oxide manufacturer can continue to use the cable without replacing it after the flame is eliminated. It will not produce toxic smoke and gas when it is roasted by fire.

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 the breakdown occurs instantaneously, the crystals at the breakdown will not form carbides. After the overload is eliminated, the cable performance will not change and it can still be used normally.

3. High operating temperature

As the melting point temperature of the insulating layer crystal is much higher than that of copper, the maximum temperature of the cable for long-term normal operation can reach 250 ℃, and the cable can continue to operate normally at 1083 ℃ near the melting point temperature of copper in a short term.

4. Good anti-corrosion and explosion-proof performance

As 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.

5. Long service life

Magnesia cables are all made of inorganic materials, so there is no insulation aging, and their service life can be more than 3 times of that of ordinary cables.

6. Greater laying flexibility

Magnesia cable can be laid on the cable tray together with ordinary cable, and can also be laid in open with special support, which is more flexible than ordinary cable laying, saves the investment in cable tray, and reduces the overall project cost.

2、 Disadvantages of light burned magnesium powder

Everything has two sides, light burned magnesium ball is no exception. It has many advantages, but also has some disadvantages, which should be paid attention to in the selection and construction.

1. High investment cost

As the outer sheath of magnesium oxide cable is composed of seamless copper tube, 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. The joint is easy to get damp

The insulating layer is composed of minerals, which can easily react with the moisture in the air to form magnesium hydroxide that can conduct electricity. During the construction of cable head, when the exposed conductor is stripped from the cable end, the insulation resistance of the cable is generally above 10M Ω. However, if the cable head is not completed within one hour, the insulation resistance can drop below 10M Ω, or even below 0.5M Ω. If the outer layer is not cut, and it is not found in time and sealed for moisture protection, the insulation value will quickly drop and gradually drop to 0, which will cause the cable to be 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 a parallel and neat appearance when laying. Moreover, the line is long and there are many joints, making it difficult to find fault points. Therefore, the construction is difficult, and it is difficult to bend into shape at the entrance and exit of the distribution box and in the bridge.

4. Large construction workload

Light burned magnesia powder is a single core cable with a specification of more than 35mm. For example, a 70mm cable requires only 3 × 70+2 × 35 Five conductors can be in the same outer sheath, and magnesium oxide must be spliced by three 70mm and one 35mm single core cables 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