Advantages and disadvantages of light burned magnesia powder

The light burnt magnesia powder itself does not burn at all, and it can run continuously for a long time at 250℃. The light burnt magnesia ball manufacturers can maintain normal operation for 30 minutes under the limit state of 1000℃ without causing fire. Even in the case of flame grilling, as long as the flame temperature is lower than the melting point of copper, the cable can continue to be used without replacing the flame after the flame is eliminated. In the case of being grilled by flames, no toxic smoke and gas will be produced. Light Burnt Magnesium Powder Factory

2. Strong overload protection capability

When the line is overloaded, the cable will not be damaged as long as the heat does not reach the melting point of copper. Even if the breakdown occurs instantaneously, no carbide will be formed in the crystal at the breakdown. After the overload is eliminated, the cable performance will not change and normal use can still be continued.

3. High working temperature

Since the melting point temperature of the insulating layer crystal is much higher than the melting point temperature of copper, the long-term normal working temperature of the cable can reach 250°C, and it can continue to operate normally at a temperature close to the melting point of copper 1083°C in the short term.

4. Good anti-corrosion and explosion-proof performance

As the seamless copper tube is used as the sheath, the light-burned magnesia powder has the properties of waterproofing, moisture, oil and some chemical substances. The copper tube has considerable mechanical strength, so it has better explosion-proof performance.

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. Greater flexibility in laying

Magnesium oxide cables can be laid on the bridge with ordinary cables, and at the same time, special brackets can be used for open laying, which is more flexible than ordinary cable laying. It also saves the investment in cable bridges and reduces the overall cost of the project.

2. Disadvantages of light burned magnesia powder

Everything has two sides, and the light-burned magnesia ball is no exception. While having many advantages, there are also some shortcomings, which should be paid attention to when selecting and constructing.

1. High investment cost

Because the outer sheath of magnesium oxide cable is made of seamless copper tube, the overall copper content is far more than that of ordinary cables. At the same time, the construction process of magnesium oxide cables requires higher equipment than ordinary cables, resulting in the price of magnesium oxide cables compared with ordinary cables. About 30% higher.

2. The joints are easily damp

The insulating layer is composed of minerals, which easily react with moisture in the air to generate conductive magnesium hydroxide. In the construction of the cable head, when the bare conductor is stripped at the cable end, the insulation resistance of the cable is generally above 10MΩ, but if the cable head is not completed within 1 hour, the insulation resistance can drop below 10MΩ, or even drop to 0.5 In the case of MΩ or less, if you do not pay attention to scratching the outer layer, and fail to find out and do the sealing and moisture-proof treatment in time, the insulation value will drop quickly and gradually drop to 0, which will cause the cable to be unusable.

3. Difficulty in construction

The hardness of light burnt magnesia powder is higher than that of ordinary cables, and the weight is about twice that of ordinary cables. It is not easy to achieve parallel and clean look and feel when laying, and it is difficult to find fault points because of long lines and many joints. It is difficult to bend into and out of the wiring box and inside the bridge frame.

4. Large amount of construction work

Light burned magnesia powder is single-core cables with specifications exceeding 35mm. For example, a 70mm cable, ordinary cables only need 3×70+2×35 five conductors in the same outer sheath, while magnesium oxide needs to reach The same specification must be composed of 3 single-core cables of 70mm and 1 35mm. The delivery length of single-core cables is relatively short. For example, the delivery length of 240mm cables is 69 meters. If the laying distance is long, it will increase the production of a large number of intermediate joints, which will double the construction workload.