The role of metal shield: 1) The formation of the worki […]
The role of metal shield:
1) The formation of the working electric field of the low-voltage electrode, when the local burr will form a great electric field strength, therefore, we must strive to make the conductor surface as smooth as possible without burr.
2) provide capacitor current and fault current path, so there are certain cross-sectional requirements.
The semi-conductive shielding layer is an important technical measure adopted by medium and high voltage cables to improve the electric field distribution on the surface of the metal electrode and improve the electric strength of the insulating surface at the same time.
1) First, instead of the conductor to form a smooth surface of the whole garden, greatly improving the surface electric field distribution,
2) At the same time, it can be in close contact with the insulation and overcome the weakness of the air gap resulting from the inability of the insulation and the metal to come into close contact, while shielding the air gap outside the workplace. This technique is also commonly used in the production of attachments.
Insulation is a key structure that reliably isolates high-voltage electrodes from ground electrodes.
1) To withstand the long-term effects of operating voltage and various over-voltages, its electrical strength and long-term stability are the most important parts of the entire cable transmission.
2) Can withstand the heat of the heat conductor to maintain the proper electric strength.
The progress of cable technology is mainly determined by the progress of insulation technology. From production to operation, most of the pilot measurement projects are aimed at monitoring the various properties of the insulation.
Cover is an important guarantee for the protection of insulation and the normal and reliable operation of the entire cable.
Designed for a variety of environmental conditions have the appropriate cover structure. Mainly mechanical protection (longitudinal, radial external force), waterproof, fireproof, anti-corrosion, anti-biological and so on. Various combinations can be made as needed.