Ice melting method based on 500kv transmission line

Abstract

The invention discloses an ice melting method based on a 500kV power transmission line. The ice melting method comprises the following steps: (1) recording the numbers of strain sections and spacers, and optimizing the spacers to realize sub-conductor full insulation; (2) setting up a test platform; (3) carrying out an ice melting test on phase-A conductors, and connecting the high-voltage output end and the grounding end of a movable direct-current ice melting device with one or two of phase-A quaternary-splitting sub-conductors respectively; (4) switching on a test loop power supply and carrying out an ice melting test on the phase-A quaternary-splitting sub-conductors; (5) switching off the test power supply, connecting the high-voltage output end of the movable direct-current ice melting device with one remainder sub-conductor, and connecting the grounding end with another remainder sub-conductor or any two sub-conductors in the step 3, and repeating the step 4 until the coated ice of the phase-A conductors is completely melted; (6) repeating the steps 3 to 5, and carrying out an ice melting test on phase-B conductors; (7) repeating the steps 3 to 5, and carrying out an ice melting test on phase-C conductors. The ice melting method disclosed by the invention is capable of meeting the needs of an ice melting capacity of the 500kV power transmission line.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a method for melting ice based on a 500kV transmission line. Background technique [0002] With the sharp increase in the demand for electricity in modern society, the power grid transmission adopts the long-distance and large-capacity transmission method. Hunan has formed a backbone transmission network with a voltage level of 500kV, and the distance between adjacent towers is very large; on the other hand, my country in 2007 From the end of 2008 to the beginning of 2008, many provinces and cities in the south of the country caused huge losses to people's lives and national property due to line disconnection and tower collapse accidents caused by rainy, snowy and freezing weather. The increase in ice capacity will inevitably increase the weight and volume of the ice-melting device, which is not only expensive, but also not easy to carry on site. The limi...

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Problems solved by technology

[0002] With the sharp increase in the demand for electricity in modern society, the power grid transmission adopts the long-distance and large-capacity transmission method. Hunan has formed a backbone transmission network with a voltage level of 500kV, and the distance between adjacent towers is very large; on the other hand, my country in 2007 From the end of 2008 to the beginning of 2008, many provinces and cities in the south of the country caused huge losses to people's lives and national property due to line disconnection and tower collapse accidents caused by rainy, snowy and freezing weather. The increase in ice capacity will inevitably increase the weight and volume of the ice-melting device, which is not only expensive, but also not easy to carry on site. The limitation of the special and complex terrain on site also affects its ability to resist ice disasters to a certain extent.

[0003] At present, my country's AC 500kV transmission lines generally use four-split sub-conductors, and a four-split spacer bar must be installed every 40 to 100 meters between the four-split sub-conductors to keep the distance between the four sub-conductors constant and suppress vibration. At present, domestic The four-split spacer is made of metal material, and it is difficult to maintain the insulation between the four sub-conductors in the tension section