To continuously strengthen the foundation of operation and management and fully promote the improvement of line loss indicators, the Development Department of State Grid Yancheng Power Supply Company organized a team of professional experts from the Distribution Network Department, Marketing Department, and Dongtai and Dafeng companies to focus on key tasks such as line loss management in grassroots distribution areas and photovoltaic pilot construction. They went to Jianhu and Sheyang to carry out special assistance and exchanges to improve line loss indicators, helping to improve the quality and efficiency of grassroots power supply management.cordless stick vacuum China
As the core department responsible for the company's operation and management, the Development Department of State Grid Yancheng Power Supply Company has always regarded the management of synchronous line loss as the top priority of the special action to improve quality and efficiency. In recent years, State Grid Yancheng Power Supply Company has been selected as one of the top ten cities in terms of synchronous line loss, ranking sixth in the country and third in the province in the State Grid's "Top Ten and Top 100" evaluation. Several county companies, including Dongtai, Dafeng, and Jianhu, have been selected as top 100 counties. This cross-regional and multi-professional joint assistance has broken down the information silos between cities and counties and between different professions. It has also disseminated the mature experiences accumulated by Dongtai, Dafeng and other places in the creation of top 100 substations, such as "one policy per substation area" and "daily monitoring, daily reporting and daily processing", so that good practices can be transformed from "bonsai" into "landscape".
To address the limitations of technical loss reduction in distribution network lines, such as light overload, circuitous power supply, and small conductor cross-sections, the expert team utilized a synchronous line loss management system to retrieve seven consecutive days of line loss rate fluctuation curves. They combined this with HPLC high-frequency data acquisition to screen for voltage loss, phase failures, open-cover records, and abnormal reverse power. For areas with persistently high losses, they systematically screened each item using the "six-element method"—checking the main distribution transformer meter, the relationship between the transformer and the user, the data acquisition success rate, metering faults, incorrect wiring, electricity usage without meters, and electricity theft. They demonstrated on-site how to use a clamp-on power meter to verify three-phase imbalance and neutral current, simultaneously providing suggestions for installing reactive power compensation in sections of the line, and personally guiding grassroots personnel in identifying communication protocol matching issues with photovoltaic users' on-grid meters.Cordless Vacuum Cleaner China
Meanwhile, when the backfeed of photovoltaic power exceeds the range of the distribution transformer metering device or the concentrator carrier module is mismatched at midday, alarms often appear with falsely high or negative line loss rates, which are easily misjudged as management problems. This assistance specifically included the construction of photovoltaic pilot projects in the scope of joint site surveys to verify site lighting conditions, electrical distance to the grid connection point, configuration of anti-reverse current devices, and voltage regulation capabilities. It guided grassroots units to handle the issues according to the steps of "first addressing abnormal records, then calibrating photovoltaic metering, and finally assessing voltage quality." In conjunction with the "observable, measurable, controllable, and adjustable" four-fold construction requirements for photovoltaic power that the distribution network department is promoting, it proactively avoids the risks of three-phase imbalance and voltage exceeding the upper limit that may be caused by subsequent batch grid connections, reserving technical margins for the friendly access of new energy sources.
Line loss mitigation is a marathon without an end. Therefore, we must emulate the State Grid Yancheng Power Supply Company's Development Department, tracking progress through weekly meetings, continuing to leverage the company's "Top 100" initiative, and consistently providing policy guidance, technical support, and experience to frontline workers. Only in this way can we ensure that every kilowatt-hour of electricity is accounted for and every penny of benefit is retained. Only in this way can we lay a solid foundation for the construction of a new power system in Yancheng.
