Into the 110-kilovolt substation at the artificial island of Hong Kong-Zhuhai Bridge, several testers are staring at the lights on the instrument to debug, the side of the equipment are affixed to the "charged" reminder note. Substation wall part of the wall has been installed, at the construction site, the workers are busy for the "substation" for the final decoration.
And then less than a month, this bear the Hong Kong-Zhuhai-Macao Bridge and the port of artificial island power supply important task of the substation can be put into use. "110-kilovolt artificial island substation civil construction into the finishing work, is waiting for acceptance, is expected to be completed by the end of November put into operation." Zhuhai Power Supply Bureau official said.
In order to protect the reliability of the Hong Kong-Zhuhai-Macao Bridge and the Island, the Zhuhai Power Supply Bureau used the technology of "network equipment" for the first time in the substation construction, so that the two power supplies were "alternate" and greatly reduced the power failure risk. Upon completion, the substation can also achieve unattended operation, more intelligent.
110 kV substation equipment has been charged test
Power is one of the prerequisites for the opening of the Hong Kong-Zhuhai-Macao Bridge. Recently, the author boarded the Hong Kong-Zhuhai-Macao Bridge port artificial island, a stylish building attracts the eye, which is about to be put into use Hong Kong-Zhuhai-Macao Bridge artificial bridge substation. "Hong Kong-Zhuhai-Macao Bridge and the port of the artificial island of all electricity will be exported from here." Southern Power Grid, Guangdong Zhuhai Power Supply Bureau, said Liu Ying, director of infrastructure projects.
110 kilovolt artificial island power transmission project is the Hong Kong-Zhuhai-Macao bridge supporting power project, located in the Zhuhai-Macao port artificial northwest corner of the Zhuhai port municipal supporting area, the main commitment to the artificial island and Hong Kong-Zhuhai Bridge ontology project power supply tasks. "This project to improve the country and Guangdong, Hong Kong and Macao integrated transport system and the highway network to provide electricity to ensure sustainable development is of great significance." Liu said.
In view of the particularity of the Hong Kong-Zhuhai-Macao Bridge Artificial Island and the extreme importance of the electricity customers on the island, the artificial island has laid a 10-kilovolt line grid to provide more powerful power supply protection for the development, construction and development of artificial islands. Is one of the hub of the entire distribution network.
Hong Kong-Zhuhai-Macao Bridge port artificial island substation opened at the end of February this year, the current substation electrical equipment has been installed and commissioned to complete the completion of all lines of cable laying, is the road and facade construction, construction into the final stage, is expected by the end of November this year Can be completed and put into production.
"Project put into operation, the Zhuhai-Macao port artificial island will form a 220-kilovolt Kyrgyzstan transformer substation to 110-kilovolt artificial island substation, 220 kV Gongbei substation to 110 kV bridge dedicated substation and 110 kV artificial island substation to 110 kV bridge Dedicated station connected to a closed-loop circuit, and the Zhuhai power grid network reliable connection. "Liu Ying introduced.
In addition, as one of the distribution network project Hong Kong-Zhuhai-Macao Bridge Zhuhai-Macao port artificial island 10 kV switch station project was completed on September 28 this year, put into operation. "Hong Kong-Zhuhai-Macao Bridge to be opened at the end of the conditions, including power supply is essential to the basic factors, artificial island power transmission project smoothly, as soon as the bridge reached the conditions of traffic clearance to provide a strong guarantee." Liu said.
New 6000 meters underground ditch "electric island"
"Power transmission and transformation" is a system of engineering, in addition to the hub as a "substation", also need to set up cable channel. How to "get through" from the urban area to the artificial island of the transmission channel to become the Zhuhai Power Supply Bureau need to overcome one of the problems.
Through the summer Bay, Gongbei port and the city streets of Kyrgyzstan to extend the island line to the island. "As the underground pipeline is complex, the ground building is dense, the difficulty is greatly improved." Eventually, after a round of new underground ditch 6240 meters, laying cable 7200 meters "underground needle thread" project, by Gongbei substation and Kyrgyzstan transformer substation 110 thousand The cable is on the island
Hong Kong-Zhuhai-Macao Bridge is the "century project", high standards, strict management, any construction units should be strictly in accordance with the construction standards to operate. In the process of introducing cables into artificial islands, the engineers of Zhuhai Power Supply Bureau had encountered problems. "The construction of the bridge is only a 65 cm × 65 cm cable trench, and is the planning department approved the only channel, the space can not be arranged conventional cable intermediate connector.
To this end, Zhuhai Power Supply Bureau adopted the advanced "MMJ" cable head welding technology. "From the current application point of view, its technology is reliable, stable operation, take up small space and other characteristics, without increasing the transformation of the original cable trench in the case, can effectively save space, so as to promote the smooth development of the project." Liu said.
According to reports, this technology directly to the two cables welded together, eliminating the huge cable connector equipment involved, take up space greatly reduced, successfully overcome the cable trench space is limited. In addition, "MMJ connector technology" also has a low resistance, high strength characteristics, can withstand the impact of fault current and long-term high-current operation of the advantages and reduce operational risk.
The first use of "network prepared by the vote" to improve power supply reliability
In June this year, held the national annual power reliability index conference, the Southern Power Grid Guangdong Zhuhai Power Supply Bureau, the average power outage time is only 1.87 hours, power supply reliability rate ranks first in the country. In order to better complete the important task of providing power for the Hong Kong-Zhuhai-Macao Bridge, it is the top priority of this project to try to improve the "reliability" of power supply.
According to reports, 10 kV artificial island switch station from the island 110 kilovolt port substation and the island's 110-kilovolt artificial island substation on both sides of the power supply, and each side of the power supply by two pairs of cables to form a dual-loop power supply , To protect the 10 kV artificial island switch station with 4 loop power supply of high reliability.
At the same time, the Zhuhai Power Supply Bureau for the first time using the "network prepared by the self" approach to solve the public station and dedicated station 110 thousand dollars from the vote can not meet the line N-1 problem.
"In simple terms, the network prepared by the self-cast technology is the two lines are spare, when a line is disconnected, there is another line to protect the continuity of power supply, through the provision of self-cast device to increase communication interface equipment, And the dedicated station on both sides of the equipment from the investment information sharing, so that the action logic to meet the different modes of operation. "Liu Ying said that by taking the network and information sharing and other management methods, the substation will be more" intelligent " Can be used in unattended mode of operation.
According to the Zhuhai-Macao port artificial island overall planning requirements, the appearance of the substation also has a more modern, stylish design. 110 kilovolt artificial island power transmission project construction Innovation of the building style, the building facade design for the curtain wall and aluminum slab plate match to show a more beautiful overall architectural image. At present, the facade of the substation is making the final "make-up". Liu Ying said, "According to the design, the blue and blue wavy stripes in the substation on the facade to extend to go, as a floating in the sea color satin, and Lingdingyang on the Hong Kong - Zhuhai - Macao Bridge echo each other.