T/CES 066-2021 Active Group standards

T/CES 066-2021 Soft carbon grounding device construction work regulations for power transmission line software

Publish Date: 2021-09-28 Implement Date: 2021-09-30 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CES 066-2021

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Electrician

ICS Name: \nTransmission lines and distribution lines

Publish Date: 2021-09-28

Implement Date: 2021-09-30

Scope

Scope: This document specifies the operating procedures for soft graphite grounding devices in the construction phase of transmission line projects. This document applies to the construction of grounding projects for transmission lines with voltage levels of 35kV and above, and the safety, quality requirements, and precautions that should be observed during the construction process; Main technical content: Based on the current application status of grounding bodies in transmission line projects and the unique construction characteristics of soft graphite grounding devices, requirements are put forward for connection processes and construction methods under different terrain and soil resistivity conditions. (1) A novel and convenient connection method for soft graphite grounding devices is proposed: simple splicing, which only requires ensuring that the soft graphite grounding devices are fully fitted together, and using graphite cable bundles or metal wires for wrapping and fixing. There is no need to design complex port connection structures or carry heavy equipment such as welding machines, greatly shortening the installation time and reducing the labor intensity of construction workers. In harsh terrain conditions such as mountainous areas, the construction characteristics and technical-economic advantages of soft graphite grounding devices are more prominent. (2) Based on the calculation formula for the usage quantity of soft graphite grounding devices, construction design methods for different soil resistivity are proposed. Based on the indicator of soil resistivity, four design methods are divided, with strong construction targeting. If the soil resistivity is very high, the soft graphite grounding devices can also be used as grounding modules to further reduce grounding resistance, with broad construction versatility. (3) The high tensile strength of soft graphite grounding devices, their special "rope-like" structure, and certain flexibility enable the