220 kV high voltage line

In addition to damaging the beauty of the environment, high-voltage lines crisscrossed by thousands of volts will have harmful effects on people nearby due to the electromagnetic field generated around them. This mainly depends on the strength of the electromagnetic field.
When people are exposed to the electric field intensity of 50 ~ 200 kV/m, there may be headache, dizziness, fatigue, poor sleep, loss of appetite, blood, cardiovascular system and central nervous system abnormalities. Of course, here refers to the voltage of more than 100 kV ultra-high voltage transmission lines, according to regulations generally not through residential areas, so ordinary people can be protected from the harm. In cities and residential areas, most of the power distribution lines with a voltage below 1 thousand volts are set up at a specified height, which has little impact on the human body. If a high-voltage transmission line between 1 and 100 kV has to pass through residential areas, it should be set up at least 6.5 meters above the ground.
In addition, the remote transmission in most areas of our country is mainly 220 kV.
The 220 kV Yuanshan North Line is an important power supply outlet in the western area of Chengdu. In the recent continuous high temperature weather, the line appeared abnormal heating emergency defect, but because the line was extremely heavy load and could not be interrupted, Chengdu Power Supply immediately decided to use the equipotential live working method with the greatest safety risk and the highest technical difficulty in live working project to eliminate the loss.
At 7:30 a.m., the elimination of electric equipotential began. Under the hot sun, the 8 operators cooperated closely and orderly. They put the block, connected the insulated ladder, put on the shielded working clothes, climbed the ladder, seized the 220 kV high-voltage line into the equipotential, and polished the wire clamp… Four hours later, the temperature of the cable clamp of the equipment on the large side of tower 10 returned to normal, and the elimination work was quickly completed without affecting the power supply. The 220 kV Yuanshan North Line continues to transport the load in the “full state”, further improving the summertime kurtosis guarantee ability of Chengdu power grid.


Post time: Nov-28-2022

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