Medium- and High-Voltage Power Transmission: Building the "Backbone" of Regional Energy Transmission
Power transmission is the "main artery" of the energy system, undertaking the efficient transmission of electricity from production to consumption, and directly related to energy security, economic development, and people's livelihood. With the increasing demand for optimized regional energy allocation in my country, the disparity between the distribution of resources such as coal, wind power, and photovoltaics and regional electricity loads is becoming increasingly prominent. Medium- and high-voltage power transmission technology has emerged to address this, becoming a core support for resolving regional energy supply and demand contradictions and promoting local energy transformation, thus building a solid "backbone" for cross-regional, medium- and long-distance energy transmission.
Medium- and high-voltage power transmission typically refers to transmission lines with voltage levels between 110kV and 500kV. It forms the core backbone network of my country's power grid, complementing low-voltage distribution and ultra-high-voltage transmission, and possesses core advantages such as moderate transmission capacity, wide coverage, reasonable construction costs, and strong adaptability. Data shows that the transmission capacity of 220kV and 500kV medium- and high-voltage transmission lines can meet the regional energy allocation needs, with transmission distances reaching 500-800 kilometers. Line loss rates are controlled within a reasonable range, balancing energy transmission efficiency and construction economy, making them the core carriers connecting energy bases and regional load centers.
As a core component of the medium- and high-voltage transmission system, in addition to key insulation equipment such as glass insulators, substations, transmission towers, and special conductors also play indispensable roles.
These pieces of equipment work together to build a safe, efficient, and stable medium- and high-voltage transmission network, supporting the efficient allocation of regional energy.
My country's medium- and high-voltage (MTH) power transmission networks have achieved full coverage of all areas above the county level nationwide, establishing a dense regional backbone network that covers various energy bases and urban and rural load centers, thus optimizing energy allocation within the region. MTH transmission not only facilitates the large-scale grid connection of new energy sources (wind power and photovoltaics) and promotes the efficient consumption of clean energy, but also alleviates power shortages in cities and industrial parks, reduces fossil fuel consumption and carbon emissions, aligning with the "dual carbon" goal and providing stable power support for local economic development.
In the future, as regional energy transformation continues to deepen, MTH transmission technology will develop towards greater intelligence, greener practices, and greater reliability. Smart substation technology will be further popularized, improving grid regulation and operation and maintenance efficiency; digital and intelligent technologies will be fully integrated, enabling real-time monitoring and precise operation and maintenance of lines; simultaneously, the MTH transmission network will be further optimized and upgraded, strengthening its adaptability to new energy grid connection, improving the regional energy transmission network, and providing solid support for regional energy security and green development.