With the rapid development of power grids, substantial growth of equipment, and technological updates and iterations, equipment management is facing many challenges. As of March 2021, State Grid Zhejiang Electric Power has a total of 2,432 substations (converter stations) of 35 kV and above, a total of 71,288 kilometers of transmission lines of 35 kV and above, and a total of 69,577 thousand of 35-500 kV AC and DC lines. Meter. As the core foundation of power grid management, equipment management not only undertakes the fundamental task of ensuring grid safety and power supply, but also has the important mission of promoting grid upgrades and supporting clean and low-carbon development. The management of hidden equipment hazards must be constantly grasped.
It not only strengthens the mechanism guarantee, but also implements the main responsibility. State Grid Zhejiang Electric Power issued "1" overall plan, built "1" guarantee system, and formulated "N" special rectification plans, clarified work ideas, clarified technical plans and work goals, and formed a top-down linkage, horizontal coordination, and overall advancement. Work pattern, promote the implementation of hidden danger investigation and management, see practical results, and gradually improve management and control measures and guarantee mechanisms.
"The lack of a'non-electricity protection action' signal in the monitoring background does not comply with the countermeasures regulations and must be checked again." On April 26, State Grid Zhejiang Electric Power employee Du An earnestly followed the equipment hidden dangers. "Every notice must be checked and the countermeasures required. The "Four Must-Check" requirements of "must check, check every similar abnormality, check every repeated problem", carry out the acceptance work of the main transformer capacitor cut-over of the 500 kV Wuning Substation.
"After repeated inspections, we have determined that there is a hidden danger of missing protection signals in the non-electrical protection circuit. This signal is very important, and the lack of it will affect our early judgment of equipment failures, and it is easy to cause the failure to expand." Duan said, hidden dangers. The "Four Must-Check" mechanism can ensure a more timely and comprehensive investigation of hidden dangers of various equipment, and effectively curb the occurrence of abnormal incidents.
If the investigation of hidden dangers is the first step, then governance is even more critical. State Grid Zhejiang Electric Power requires equipment owners to deeply participate in important early stages such as feasibility study preliminary design, equipment supervision and manufacturing, and carry out concealed projects and special test supervision and witness.
On May 11, near the terminal box at the Danguan bay of the 500 kV Danxi Substation, Jin Chunshan, the deputy head of the operation and maintenance team of the Jinhua Transportation Inspection Center of the company, carefully installed the short wiring on the terminal block, and then tested it in accordance with the anti-jumping loop Steps, click on the closing and opening nodes in an orderly manner. He carefully observed the opening and closing of the switch and made a mark on the notebook.
"The study of the maintenance profession has allowed me to understand the equipment structure more thoroughly and have a stronger control over the equipment." Jin Chunshan said that in 2021, he led the team of young employees to participate in the center's 220kV line interval one. , The second independent overhaul and many other tasks, and orderly promote the management of various hidden dangers. "Equipment owner + general practitioner" has greatly improved the company's ability to treat hidden dangers in depth.
Since the beginning of this year, State Grid Zhejiang Electric Power has comprehensively improved the professional capabilities and skills of “specialists” and “general practitioners” through the implementation of “professional maintenance” and “integration of operation and inspection”. The "Golden Blue Collar" team accurately removed the "lesions" of the equipment. Not only that, the company has also carried out source control in major projects such as the annual maintenance of the converter station of Jinhua station converter station and the expansion of the main transformer of the 500 kV Wuning substation in response to the requirements of countermeasures and the hidden dangers of operation, and put forward 53 optimization and improvement suggestions to equipment manufacturers. .
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