In 2021, the failure and outage rate of State Grid Chongqing power cables decreased by 20 percentage points year-on-year

On February 21, in the monitoring hall of the cable management center of the State Grid Chongqing EHV Company, the monitoring class employees remotely checked the cable operation in the 220 kV Jianglong cable channel 15 kilometers away through the cable lean management platform
.
The lean cable management platform is one of the achievements of the State Grid Chongqing Electric Power Company in building a characteristic cable management system in Shancheng, which can currently monitor the operation of 67 cable channels in real time and view 1553 video surveillance screens
.

The trend of Chongqing cable path is complex, the cable channel height drop is up to 92 meters, construction and daily operation and maintenance are difficult, and the risk of external damage and fire is high
.
With the acceleration of urbanization, high-voltage cables are increasingly used in Chongqing's power grid, which brings challenges
to cable construction and operation and maintenance.
In January 2019, State Grid Chongqing Electric Power formulated a three-year action plan for improving the professional management level of cables, and built a cable management system with mountain city characteristics and strengthened the lean management
of high-voltage cables by strengthening construction technology control, building smart cable channels, and strengthening cable fire prevention and control.
In 2021, the company's cable failure outage rate decreased by 20 percentage points
year-on-year.

State Grid Chongqing Electric Power studied the difficulties of cable deployment in mountain cities with "large slope and high drop", summarized the standardized construction process and applied it to the cable transformation site
with a terrain height difference of 90 meters.
The company participated in the preparation of Chongqing comprehensive pipe gallery design standards, participated in the construction of smart cities and smart pipelines, and accumulated experience for the construction of smart cable channels; Combined with the 3D map of the city reality, the cable channel path modeling was carried out; The online cable lean management platform can perceive the operating status and channel environment
of the cable body in real time through online monitoring of cable status and robot inspection.

At the same time, State Grid Chongqing Electric Power has improved the fire emergency management system, carried out research on fire hazards such as the "chimney effect" of high-drop cable channels and the segmented blocking of non-flame retardant cables, equipped special fire trucks for cable tunnels, innovatively applied non-flame retardant cable segmentation blocking measures, and introduced tunnel high-pressure carbon dioxide fire extinguishing technology to achieve rapid disposal of fires in fire prevention zones; Cooperate with local fire rescue to carry out cable tunnel fire emergency linkage drills to improve the emergency support level of
cable tunnels.