Longrod composite insulators - UHV 1000kV composite insulators

• Project

  The Nanyang-Jingmen-Changsha 1000 kV UHV AC power transmission line project is an important part of the "Sun"-shaped ring network of the Central China Power Grid. The project builds a new Changsha 1000 kV substation, expands the Jingmen 1000 kV substation, builds a new Nanyang-Jingmen 1000 kV AC transmission line, and builds a new Jingmen-Changsha 1000 kV AC transmission line. The construction of this project will significantly improve the power exchange capacity between Hubei and Henan and Hubei and Hunan sections, meet the requirements for the safe and stable operation of the Central China Power Grid after multiple DC feeds, build a strong Central China UHV AC ring network, and improve the energy resource allocation capacity in Central China. The project is scheduled to be completed in December 2022. After it is put into operation, it will meet the needs of power transmission and input in Hunan, Hubei, Henan and other provinces at various times of the year, expand the scope of clean energy consumption, and provide strong energy for the high-quality and green development of central area economy and society power.

What are the characteristics of the insulation of AC UHV power grid electrical equipment and what are its influencing factors?

A modern power grid should have basic functions of safety and uninterruption. Practice shows that in all power outage accidents, insulation flashover or breakdown of electrical equipment in transmission lines and substations is the main cause. Therefore, in order to ensure that the power grid has an acceptable reliability index, it is crucial to scientifically and rationally select the insulation level of electrical devices. The insulation of electrical equipment will be affected by the following voltages during operation: working voltage, temporary overvoltage, operating overvoltage, lightning overvoltage and steep wave overvoltage. The dielectric strength of electrical devices is generally characterized by the discharge voltage under the action of the various voltages mentioned above.

The main characteristics of AC UHV equipment insulation are: first, high operating voltage. In order to reduce the size and cost of equipment, measures such as the use of large-capacity and high-performance arresters are used to reduce overvoltage levels and equipment test insulation levels. The ratio of operating voltage to test level has increased significantly compared with ultra-high voltage. Second, the importance of equipment has increased. The transmission capacity of UHV lines can reach 500 kilowatts, and the capacity of a single transformer group is 300 kilowatts, requiring higher reliability of equipment. Third, the equipment size is relatively large. As the size of the equipment increases, factors such as stray distributed capacitance and local heating pose threats to the long-term stable operation of the insulation.

The insulation of UHV transmission lines can be divided into two categories: one is the air gap between the conductor and the tower or the earth, and the other is the insulator. Due to the increase in voltage levels, UHV transmission projects have put forward higher requirements for insulators, such as high mechanical strength, anti-pollution flashover, improved overvoltage tolerance and reduced radio interference.

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