The lightning protection and grounding engineering of power plants is a project worthy of attention. With the development of the times, electricity has become an indispensable part of our life and work. Once the power system is damaged, it will surely bring us work and life. Great inconvenience and loss, and lightning strike is the biggest cause of power plant accidents. The following technical personnel of Zhengzhou Leidi Electronic Engineering Co., Ltd. combined their own work experience to discuss the design and construction of the lightning protection grounding engineering of the power plant.
First of all, we talk about the installation of lightning rods, the main consideration is how to prevent counterattack. For the counterattack considerations, the installation of lightning rods can be divided into two types of framework lightning rod and independent lightning rod. For 110kV and above distribution equipment, Because of the high insulation level of electrical equipment, it is not easy to counterattack in areas with low soil resistivity. Structure lightning rods can be used, which can save investment and facilitate the layout. However, attention should be paid to the installation of lightning rods to the nearby auxiliary centralized grounding device. The electrical distance between the connection point of the substation grounding grid and the connection point of the main transformer and the ground grid should not be less than 15m so that when the lightning strikes the lightning rod, the potential on the grounding device rises, after a distance of 15m. Its amplitude has been attenuated so as not to counterattack the transformer with relatively weak insulation. Similarly, a lightning rod must not be installed on the door frame of the transformer. For other power distribution devices, an independent lightning rod should be installed. The grounding device is separately buried in the ground grid of the substation and kept in the air and underground. Sufficient distance. In practical work, if the technical examination of the lightning rod and its grounding device is not neglected, and the grounding device is intact and the grounding resistance is qualified, generally no lightning strikes the power plant or substation.
The intruder lightning wave in the power supply line comes from lightning strike or lightning static induction.
The main restriction measures are: installation of arresters, line protection sections, and capacitors in power plants and substations. The role is to limit the amplitude and steepness of the lightning overvoltage, ie intruder lightning wave, to the extent of no harm to electrical equipment, and to protect the insulation of electrical equipment to avoid the occurrence of lightning accidents. Because of the current level of science and technology, it is impossible to control lightning and cannot predict its development law and strength. Transmission lines that are long lines and are located in the wilderness are vulnerable to lightning strikes. Therefore, it is impossible to completely avoid lightning and lightning surges. According to the data, in the 220kV and 500kV power plants in China, the accident rate caused by intruding lightning waves is 0.5 times/100 hundred a and 0.4 times/100 hundred a; the lightning damage rate of the direct-distribution motor in the power plant It is 1.25 times/100 hundred a. Measures to Prevent Lightning Accidents Due to the randomness of lightning activity, the data on which lightning protection is based is mostly statistical data. It is necessary to correct the actual data based on the operating experience and the frequency and intensity of lightning activity. Lightning protection is closely related to the way the power plant operates during the thunderstorm season. Therefore, for a certain power plant, in the actual production process, it is necessary to formulate and adopt corresponding lightning protection measures on the basis of technology and management to prevent accidents caused by lightning attacks.
Secondly, we must do a good job of insulation treatment, must be targeted for the intensity of the activity of the thunderbolt, activity observation, research and statistics work to guide and correct the arrangement and selection of lightning protection measures, so that lightning protection is more perfect and more Can play a protective role. In the thunderstorm season, it is necessary to formulate lightning protection programs. Different operating modes have different effects on lightning protection. Different lightning protection systems adapt to different operating modes. Therefore, in order to establish and revise the overvoltage lightning protection connection diagram and formulate the relevant lightning protection regulations under each operating mode, we must establish and revise the wiring diagrams in accordance with the various methods recommended in the voltage protection regulations and the specific operating experience of the company (the company). Ensure the safety of production and operation during the thunderstorm season. Periodically conducting insulation supervision is the basic guarantee for maintaining a good level of electrical equipment insulation. When the electrical insulation is in normal operation, it is under the action of the working voltage for a long time, and sometimes it is also subjected to a short-time overvoltage, which will cause insulation aging. It will be affected by factors such as mechanical force, temperature and atmospheric environment, which will degrade the insulation ability. Therefore, it is necessary to regularly supervise and insulate the insulation of electrical equipment in order to grasp the degree of insulation deterioration, insulation strength, insulation level, insulation defects, etc., and perform targeted maintenance accordingly.
The specific design and implementation plan for lightning protection and grounding of power plants is based on local conditions rather than a unified model. For details, please contact the technical personnel of Zhengzhou Leidi Electronic Engineering Co., Ltd.!!!
First of all, we talk about the installation of lightning rods, the main consideration is how to prevent counterattack. For the counterattack considerations, the installation of lightning rods can be divided into two types of framework lightning rod and independent lightning rod. For 110kV and above distribution equipment, Because of the high insulation level of electrical equipment, it is not easy to counterattack in areas with low soil resistivity. Structure lightning rods can be used, which can save investment and facilitate the layout. However, attention should be paid to the installation of lightning rods to the nearby auxiliary centralized grounding device. The electrical distance between the connection point of the substation grounding grid and the connection point of the main transformer and the ground grid should not be less than 15m so that when the lightning strikes the lightning rod, the potential on the grounding device rises, after a distance of 15m. Its amplitude has been attenuated so as not to counterattack the transformer with relatively weak insulation. Similarly, a lightning rod must not be installed on the door frame of the transformer. For other power distribution devices, an independent lightning rod should be installed. The grounding device is separately buried in the ground grid of the substation and kept in the air and underground. Sufficient distance. In practical work, if the technical examination of the lightning rod and its grounding device is not neglected, and the grounding device is intact and the grounding resistance is qualified, generally no lightning strikes the power plant or substation.
The intruder lightning wave in the power supply line comes from lightning strike or lightning static induction.
The main restriction measures are: installation of arresters, line protection sections, and capacitors in power plants and substations. The role is to limit the amplitude and steepness of the lightning overvoltage, ie intruder lightning wave, to the extent of no harm to electrical equipment, and to protect the insulation of electrical equipment to avoid the occurrence of lightning accidents. Because of the current level of science and technology, it is impossible to control lightning and cannot predict its development law and strength. Transmission lines that are long lines and are located in the wilderness are vulnerable to lightning strikes. Therefore, it is impossible to completely avoid lightning and lightning surges. According to the data, in the 220kV and 500kV power plants in China, the accident rate caused by intruding lightning waves is 0.5 times/100 hundred a and 0.4 times/100 hundred a; the lightning damage rate of the direct-distribution motor in the power plant It is 1.25 times/100 hundred a. Measures to Prevent Lightning Accidents Due to the randomness of lightning activity, the data on which lightning protection is based is mostly statistical data. It is necessary to correct the actual data based on the operating experience and the frequency and intensity of lightning activity. Lightning protection is closely related to the way the power plant operates during the thunderstorm season. Therefore, for a certain power plant, in the actual production process, it is necessary to formulate and adopt corresponding lightning protection measures on the basis of technology and management to prevent accidents caused by lightning attacks.
Secondly, we must do a good job of insulation treatment, must be targeted for the intensity of the activity of the thunderbolt, activity observation, research and statistics work to guide and correct the arrangement and selection of lightning protection measures, so that lightning protection is more perfect and more Can play a protective role. In the thunderstorm season, it is necessary to formulate lightning protection programs. Different operating modes have different effects on lightning protection. Different lightning protection systems adapt to different operating modes. Therefore, in order to establish and revise the overvoltage lightning protection connection diagram and formulate the relevant lightning protection regulations under each operating mode, we must establish and revise the wiring diagrams in accordance with the various methods recommended in the voltage protection regulations and the specific operating experience of the company (the company). Ensure the safety of production and operation during the thunderstorm season. Periodically conducting insulation supervision is the basic guarantee for maintaining a good level of electrical equipment insulation. When the electrical insulation is in normal operation, it is under the action of the working voltage for a long time, and sometimes it is also subjected to a short-time overvoltage, which will cause insulation aging. It will be affected by factors such as mechanical force, temperature and atmospheric environment, which will degrade the insulation ability. Therefore, it is necessary to regularly supervise and insulate the insulation of electrical equipment in order to grasp the degree of insulation deterioration, insulation strength, insulation level, insulation defects, etc., and perform targeted maintenance accordingly.
The specific design and implementation plan for lightning protection and grounding of power plants is based on local conditions rather than a unified model. For details, please contact the technical personnel of Zhengzhou Leidi Electronic Engineering Co., Ltd.!!!
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