A method for estimating the grounding body and its impact grounding resistance of a 500kv transmission line tower
A technology for impacting grounding resistance and power transmission lines. It is used in grounding resistance measurement, connecting contact materials and other directions. It can solve the problem of not giving calculation formulas, and achieve the effect of ensuring the safety of personnel and equipment.
Active Publication Date: 2017-07-25
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology
Some scholars have studied the method of studying the impact grounding resistance of the grounding body through simulation experiments and simulations, but did not give the corresponding calculation formula
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[0018] figure 1 It is a typical tower grounding body for transmission lines, which includes a square frame composed of four 18-meter-long flat steels or round steels; the four flat steels or round steels that make up the square or the right side) to extend outwards to form a windmill-shaped ray, the ray length is l; in order to meet the requirements of corrosion resistance and thermal stability, the section width of the flat steel is greater than 40 mm, and the thickness is greater than or equal to 5 mm. When using round steel, the round Steel diameter greater than 10mm.
[0019] See Figure 2-Figure 5 The present invention utilizes CDEGS software to carry out modeling and simulation to the typical pole tower grounding body of the present invention, when obtaining 2.6 / 50 μ s lightning current acts on the grounding body, the functional relation between grounding resistance and soil resistivity and grounding body ray length, finally gives A method for estimating the impact gro...
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The invention provides a 500 kV transmission line tower grounding body and an estimation method of impulse grounding resistance thereof. The invention is used for estimating the impulse grounding resistance of the transmission line tower grounding body under the action of the standard wave mode lightning current of 2.6 / 50 mus; in the invention, the tower grounding body comprises a square box composed of four 18 meters long flat steels or round steels, and the left sides or right sides of the four flat steels or round steels of the square box extend outwards to form a windmill-shaped ray and the ray length is 1; the section width of the flat steels is greater than 40 mm, and the thickness thereof is greater than or equal to 5 mm; when the round steels are adopted, the diameter of the round steels is greater than 10 mm. The invention has the beneficial effects that the estimation method provided by the invention can be used for estimating impulse grounding resistance of the transmission line typical tower grounding body under the action of the lightning current of 2.6 / 50 mus, providing a judgment basis to a lightning withstand level estimation of the transmission line, guiding the transformation of the transmission line typical tower grounding body and guaranteeing the safety of personnel and equipment.
Description
technical field [0001] The invention relates to a method for estimating the grounding body of a 500kV power transmission line tower and its impact grounding resistance. The method is suitable for the design or transformation of the grounding device of the power transmission line tower and belongs to the field of power system overvoltage. Background technique [0002] In recent years, large-area short-circuit power outages caused by lightning strikes have occurred continuously in many areas of our country. The grounding body of the transmission line tower is an important measure to protect the safe and reliable operation of the power system and the safety of nearby personnel. Accurate evaluation of the impact grounding resistance of the grounding body has important guiding significance for the rational design of the line tower grounding body type and the reduction of the impact grounding resistance. [0003] In recent years, scholars at home and abroad have conducted a lot o...
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IPC IPC(8): H01R4/66G01R27/20
Inventor 马御棠曹晓斌周仿荣高竹清于虹钱国超钟剑明
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST