Comprehensive lightning protection system of electric transmission lines of high tower of power grid
A transmission line, comprehensive lightning protection technology, applied in the direction of circuits, corona discharge devices, electrical components, etc., can solve the problems of power grid lightning tripping, disconnection of insulating wires, and failure to ensure that the insulation level of the line exceeds the ground lightning current, etc., to achieve The effect of improving the lightning resistance level and reducing the steepness and amplitude
Active Publication Date: 2013-12-25
成都星河科技产业有限公司
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Problems solved by technology
Therefore, most of the ground lightning can cause the power grid to trip due to lightning and cause the insulation wire to break
[0007] Due to the limitation of the insulator structure of the distribution
Method used
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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0040] figure 1 and figure 2 for the invention Schematic diagram of a comprehensive lightning protection system for high-tower transmission lines in the power grid. The system in the figure includes: substation 1, the three-phase port at the outbound end of the transformer in substation 1, the multi-level surge protection device 2 that leads to grounding, and the three-phase transmission to the grid. Line 3, an overvoltage isolator 4 is connected in series on each phase line of the three-phase transmission line 3, and the transmission network transmission line drawn from the output end of the overvoltage isolator 4 is sent to the high tower 6, and passed through the high tower 6 The insulator strings 9 of each phase connected above support the overhead lines of each phase, and a nano-magnetoresistor 5 is installed on the phase lines on both sides of the insulato...
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Abstract
The invention discloses a comprehensive lightning protection system of electric transmission lines of a high tower of a power grid. The comprehensive lightning protection system comprises a transformer substation, a grounded multi-stage surge-preventing device and the three-phase electric transmission lines connected with the power grid are led out of a three-phase port of the transformer outbound end of the transformer substation, each phase line of the three-phase electric transmission lines is connected with a voltage isolator in series, the electric transmission lines connected with the power grid and led out of the output ends of the voltage isolators are connected with the high tower, thunder and lightning arresters are arranged at the top of the high tower and connected with a maintainable ground grid embedded below the tower through the metal tower body, the overhead electric transmission lines are supported through all phase insulator strings connected to the tower in a suspended mode, two sides of the insulator string supporting each phase line are respectively provided with a nanometer magnet resistor, and lightning conductors are arranged at the top of the tower in a supported mode. By means of the technical measures, the multilevel, omni-directional and three-dimensional comprehensive lightning protection system which makes high tower protection as the center, attaches equal importance to thunder and lightning counterattack resistance and thunder and lightning shielding failure resistance and conducts omni-directional thunder and lightning protection on the electric transmission lines and the transformer substation is built, and the lightning trip-out rate can be reduced obviously.
Description
technical field [0001] The invention relates to a safety lightning protection system for a power grid, in particular to a comprehensive lightning protection system for high-tower power transmission lines in the power grid. Background technique [0002] Lightning is a discharge phenomenon of the earth's atmosphere. Usually, when the electric field strength between the negatively charged thundercloud and the earth exceeds the breakdown strength of the atmosphere, a pulse discharge between the thundercloud and the earth occurs, which is what people call thunder and lightning. During the thundercloud discharge process, the discharge current increases sharply. At the moment when the lightning reaches the ground, the lightning current reaches tens of thousands of amps, even hundreds of thousands of amps. The potential difference between the two ends of the lightning channel can reach hundreds of thousands of volts. Where the current goes, it will cause strong electromagnetic, the...
Claims
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Login to view more IPC IPC(8): H02G13/00H01T19/04
Inventor 郭玉章张强
Owner 成都星河科技产业有限公司
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