Insulating Tube Function and Capacitive Insulating Sleeve Characteristics

The insulating tube, like other insulating materials, has excellent flexibility and elasticity, and also has good dielectric and chemical resistance, so it is suitable for wiring insulation of motors, electrical appliances, instruments, radios, etc……

The insulating tube, like other insulating materials, has excellent flexibility and elasticity, and also has good dielectric and chemical resistance, so it is suitable for wiring insulation of motors, electrical appliances, instruments, radios, etc. and mechanical protection.

At present, the conductor structure of the commonly used insulating tube has two types of cable-through type and guide rod type, wherein the cable-through type adopts the lead cable of the transformer to directly pass through the sleeve, and the installation is convenient. When the working current is greater than 600 amps, it is difficult to install the cable-through structure, and a guide rod structure is generally adopted.

Insulating pipes are often made of oil or gas as an insulating medium. They are generally made to be transformer bushings or circuit breaker bushings and are commonly used for voltage levels below 35 kV. The inner cavity between the conductor of the insulating tube and the porcelain sleeve is filled with transformer oil and acts as a radial insulation. When the voltage exceeds 35 kV, an insulating tube or a covered cable is sheathed on the conductor to enhance the insulation, mainly used for ultra high voltage transformers and circuit breakers.

The use of insulating tubes can also greatly reduce the corrosion damage of accessories such as equipment wires, and also promote the extension of the working life of the equipment. Capacitive insulation bushing is one of them. Its capacitor core is made of adhesive tape, it has high mechanical strength, can be installed at any angle, has good moisture resistance, simple structure and maintenance, can be used without casing, and can also lower the heart, turning into a short tail, reducing its size.

This kind of insulating tube is different from others. It uses oil paper as the capacitor core. Generally, it has a lower porcelain sleeve. The lower part is larger in size, more sensitive to moisture, and has higher sealing requirements. The advantage is that the insulating material and process are easy to solve, and the dielectric loss is small, partial discharge performance is good.

At high voltage levels, the material and process requirements are higher, and it is not easy to eliminate the air gap in the heart, resulting in low partial discharge voltage. Adhesive tape capacitor sleeves have gradually been replaced by oil-paper capacitive bushings due to high dielectric loss and low partial discharge voltage.

Later on this basis, in addition to a plastic-impregnated paper insulating sleeve, the capacitor core was made into a heart with an insulating paper roll, vacuum impregnated with synthetic resin, and then heat-cured. Its performance combines the advantages of tape and oil-paper capacitive bushings.

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