What Causes the Insulation Performance of Silicone Rubber High Temperature Cable to Decrease

The silicon rubber high-temperature cable for traveling crane has the characteristics of cold resistance, softness, wear resistance and oil resistance. It is more suitable for traveling crane with AC rated voltage of 0.6/1kv and below. The split phase shielded nitrile flat cable with special requirements such as cold resistance and oil resistance is suitable for frequency converter power supply. The wear-resistant and anti-corrosion tensile silicon rubber high-temperature cable is suitable for power generation, metallurgy, chemical industry The electrical connection between mobile electrical equipment in harsh environment such as port has excellent wear-resistant, anti-corrosion, tensile resistance to high and low temperature and acid-base resistance.

As a common kind of special cable, silicone rubber high temperature cable is more widely used in various fields of industry due to its structure and shape. It mainly plays the role of power transmission. Most of the faults of flat cable are broken down due to reduced insulation. Chongqing wire and cable believes that there are many factors leading to insulation reduction. According to the actual operation experience, it can be summarized as follows.

This situation is also common in silicone rubber high temperature cables, which generally occurs at the flat cable joints in directly buried or row pipes. For example, the unqualified production of silicone rubber high-temperature cable joint and the making of silicone rubber high-temperature cable joint under humid climate conditions will make the joint water or mixed with water vapor. Over time, water branches will be formed under the action of electric field, which will gradually damage the insulation strength of silicone rubber high-temperature cable and cause failure.

According to the industry operation analysis in recent years, a considerable number of silicone rubber high-temperature cable faults are caused by mechanical damage. For example, the laying and installation of silicone rubber high-temperature cable is not standardized, which is easy to cause mechanical damage. Sometimes, if the damage is not serious, it will take months or even years to cause complete breakdown of the damaged part to form a fault. Sometimes, if the damage is serious, a short-circuit fault may occur in a short time, which will directly affect the operation of the equipment and the safety of the power user.

When the silicone rubber high-temperature cable is directly buried in the area with acid-base effect, the outer protective layer of the silicone rubber high-temperature cable is often corroded. The protective layer is subject to chemical corrosion or electrolytic corrosion for a long time, resulting in the failure of the protective layer, the reduction of insulation, and the failure of the silicone rubber high-temperature cable.

Silicone rubber high temperature cable joint failure. Silicone rubber high-temperature cable joint is a weak link in the cable line. Silicone rubber high-temperature cable joint faults caused by personnel's direct negligence (poor construction) often occur. In the process of making silicone rubber high-temperature cable joints, if there are reasons such as loose crimping and insufficient heating, the insulation of silicone rubber high-temperature cable head will be reduced, resulting in accidents.

Long term overload operation. During overload operation, due to the thermal effect of current, when the load current passes through the silicone rubber high-temperature cable, it will inevitably lead to conductor heating. At the same time, the skin effect of charge, eddy current loss of steel armor and insulation medium loss will also produce additional heat, so as to increase the temperature of silicone rubber high-temperature cable.

During long-term overload operation, too high temperature will accelerate the aging of insulation and even the insulation will be broken down. Especially in hot summer, the temperature rise of silicone rubber high-temperature cable often causes the weak insulation of silicone rubber high-temperature cable to be broken down first. Therefore, there are many faults of silicone rubber high-temperature cable in summer. Other reasons such as normal aging of flat cable itself or natural disasters, environment and temperature. The external environment and heat source of flat cable will also cause high temperature, insulation breakdown and even explosion and fire of flat cable.