High Voltage Cables
The inner-to-outer high-voltage cable assembly consists of the conductor, insulation, inner sheath, filling material (armouring) and outer insulation. High voltage cables are mainly used for underground burial and resist high strength compression from the ground while preventing damage from other external forces.
High voltage cables (hv cables) are used for the transmission of high voltage electricity. High voltage cables consist of a conductor and an insulator. There are single-core and three-core high-voltage cables, but most high-voltage cables are armoured. Usually, we use steel tape armouring or steel wire armouring.
The purpose of high voltage cable insulation is to prevent degradation in any application. This is due to the high voltage stresses generated by discharges or tracking in the air. In addition, the high voltage conductors must be kept safe from contact with objects.
Ultra-high voltage cables are used in a variety of applications. This includes AC and DC power transmission. In addition, ignition systems use such EHV cables.
In addition, high-voltage cables are designed to contain and regulate current leakage. Another special area where high-voltage cables are useful is in preventing insulation breakdown. Often, cable glands and terminals are able to handle high voltage stresses.
The basic design of a high-voltage cable consists of several elements. They include the conductor, conductor shield, insulator and insulating material shield. Other components include metal shields and sheaths.
Layers such as ripcords, armouring wires and adhesives are also possible. Polymers are most suitable for insulation, insulating shielding and conductor shielding.
Typically, copper or aluminium covers high-voltage shielded cables. The metal shield creates a grounding layer to drain any leaks that may exist.
The sheathing of xlpe hv cables is usually made of polymer. Its purpose is to protect the wearer from harmful elements. These elements may include moisture and chemicals. The jacket also provides protection against accidental impact.
The jacket can act as a semiconductor or be non-conductive. This depends on the properties of the soil. It also depends on the arrangement of the high-voltage earthing cable. Semiconductor jackets are useful when testing the integrity of HV cable jackets.
High voltage cable constructions, especially high voltage underground cables, must meet specific requirements. Firstly, the cable conductors should be high conductor copper or aluminium. Stranding makes the conductor more flexible and capable of carrying higher currents.
Secondly, the high-voltage cable should be sized to carry a suitable load current without overheating. It should also have a voltage drop that is within acceptable specifications. Thirdly, high voltage and low voltage cables must have adequate insulation thickness. This is necessary to provide an adequate level of safety.
High voltage cables also need mechanical protection to resist the rigours of handling during installation. Finally, the cable assembly should always be chemically and physically stable.
High voltage single core cables are often used in a number of applications. Some applications include the installation of power supply stations.
Other uses include cable ducting, outdoor and underground. Cable bridges in factories, switchboards and power stations also use this cable. High-voltage earth cables contribute to power distribution and have a nominal voltage of 64/110 kV.
Typically, the voltage range of high voltage cables exceeds 1000 volts. Cables between 2 kV and 33 kV are usually referred to as medium voltage cables. Those above 50 kV are high-voltage cables.
The effectiveness of high-voltage cables is rigorously tested. They can help to transmit electricity over more than 600,000 kilometres of road. They meet all electrical, thermal and mechanical requirements very adequately.
High-voltage cable testing is necessary. The basic principle is that it helps to predict and prevent problems before they occur. Most system problems are difficult to identify by unlicensed experts.
There are many different high voltage applications, including but not limited to
Power plants
Power transmission
Solar industry
Wind energy industry
Instrumentation industry
Ruitian offers flat and braided high voltage cables with
A wide range of textile compounds
A variety of insulation materials
Various shielding materials and types
A variety of sheathing compounds
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