A Brief Summary Of “Three Spans” Of Transmission And Distribution Lines

With the continuous upgrading and construction of power grids and transportation infrastructure, transmission lines “three across” related issues are becoming more frequent. Such as improper handling, which will likely lead to significant public safety and grid security incidents. So for the transmission lines “three across” section, construction standards and other aspects must be strictly controlled. This paper provides a summary of this issue.

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Why Can’t High-Voltage Cables Be Buried in the Ground?

Ultra-high voltage transmission refers to the use of 500 kV-1000 kV voltage levels to transmit electrical energy. If the 220kV transmission indicator is taken as 100%, the relative investment per kilometer of UHV transmission, the relative cost of 100 kilometers per kilowatt-hour of electricity transmission, and the consumption of metal materials will be greatly reduced. In this way, the utilization rate of the line corridor has been significantly improved.

In our daily life, we can often see overhead ultra-high voltage transmission projects. However, have you ever thought about this question: Why can’t all high-voltage cable be buried underground like urban underground cables? 

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The Distinction Between Post Insulators and Suspension Insulators

Post insulator: It is a special insulation control, which can play an important role in overhead transmission lines. In the early days, post insulators were mostly used for electric poles, and gradually developed from the end of high-type high-voltage wire connecting towers with a lot of suspended insulators, which were usually made of silica gel or ceramic to increase … Read more