At 9:30 on the 23rd, with the demolition of the last base high-voltage tower in the administrative office area of ​​the Beijing City Sub-center, all the overhead power lines in the core area of ​​the sub-center administrative office were all in the ground, a world with more than 10 international top grid technologies. The super-class intelligent distribution network demonstration zone was built in this way, the power supply reliability rate will reach 99.9999%, and the average annual power outage time is less than 21 seconds, which is unique in the global urban power grid.
Lai Xiangsheng, deputy general manager of State Grid Beijing Electric Power Company, said that Beijing Power completed the construction of all supporting power facilities in the core area of ​​the sub-center including the main distribution network construction and power relocation in less than two and a half years. The district has created the world's super-class grid structure, surpassing the most advanced cities such as Singapore and Paris.
He introduced that the super-class grid structure includes: “one-core dual-core†intelligent system, namely the two core central systems of Qianmen Headquarters and Tongzhou District, which automatically reserve each other's backups, automatically allocate system resources, and complete high-speed and reliable completion of various complex situations. Operational analysis and computational control; if the line fails, the system can immediately locate the faulty segment through a millisecond operation, calculate the best solution and implement remote processing, and restore power within 0.3 seconds at the earliest. The world's most advanced "double-petal" type distribution network frame structure, the wiring adopts double-ring mesh ring operation with ring or station communication, ensuring that each switch station has power supply from 3 different directions, and the reliability exceeds the current single adopted in Singapore. Ring-and-loop operation with ring-to-ring contact and double-ring network open-loop operation wiring mode adopted in Paris not only achieves an internationally leading “less than 21 seconds†level of annual power outage, but also achieves “zero flashing†of sensitive loads. The cable power supply system of the first fully integrated pipe gallery in China, the power tank structure design has a service life of 100 years, with independent operation and maintenance and repair channels.
The reporter saw at the scene that the inspection and fire-fighting robots were arranged in the pipe gallery, and the world’s first self-propelled patrol inspection equipment applied to the power pipe gallery. The surface of the 220 kV cable was coated with temperature measurement and vibration cables, and inspections were carried out. Monitoring is all online and automated.
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