Abstract
The environment in the 500kV cross-linked cable tunnel is bad, which is not conducive to ensuring the joint manufacturing process, and it is easy to cause joint installation defects. A joint installation environmental control system stabilizing the temperature and humidity of the joint installation area and reducing dust particles in the air was designed and developed. A closed space in the joint area was formed by use of sliced inflatable membranes. The integration of refrigeration and air-conditioning technology, air dehumidification technology, air filtration technology and air volume adjustment technology realized temperature, humidity, and cleanliness control of the joint installation area. Stable temperature and humidity, as well as clean air atmosphere can greatly improve the installation quality of high-voltage cable joints in the complex cable tunnel environment, and help reduce the failure rate of joints.
Highlights
The environment in the 500kV cross-linked cable tunnel is bad, which is not conducive to ensuring the joint manufacturing process, and it is easy to cause joint installation defects
During the joint manufacturing process, it is inevitable that the joint processing interface will absorb moisture and adhere to dust particles
With reference to the technical practice and experience of GIS equipment installation, a controllable tent was used to physically isolate the joint area at the installation site of the cable joint, which initially realized the environmental control of the joint installation environment [8-12]
Summary
In order to make full use of the urban ground space, improve the reliability of urban power supply as much as possible, and beautify the urban environment, the current ultra-high voltage cables in large cities usually use underground work tunnels instead of overhead lines. With the development of industrial technology, especially in the installation process of GIS equipment in UHV projects, strict dust-proof measures have been implemented to ensure high cleanliness by controlling the "dust level" of the external environment. Under the premise of meeting national standards, quantitative control of the temperature, humidity and cleanliness of the cable joint environment will greatly improve the installation reliability and work efficiency of the installation of cross-linked cable joints. It can reduce future maintenance workload and maintenance costs. As a kind of technical reserve, it can promote the improvement of joint technology and achieve good economic benefits
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