Huanshan Substation Lightning Protection Project Case
I.Project Background
The substation is located on top of the original river channel,the depth of the layer within 4m are rocks and river pebbles,no soil,the grounding resistivity exceeds 2000Ω-m,the construction conditions are relatively harsh,covering an area of 180m long and 150m wide,considering the frequent lightning activities in the area,the lightning protection and grounding system of the substation puts forward higher requirements.Therefore,this project aims to improve the lightning protection ability of Huanshan Substation through the comprehensive transformation and upgrading of the grounding network to ensure the stable operation of the power grid.
II.The technical parameters
-Grounding resistance:not more than 0.5 ohm
Main materials:electroformed copper rods,HD-M1 nano-particle crystal grounding module,HD-J10 water-soluble colloidal retarder,galvanised flat steel and other construction materials.
III.Construction process
1.Site investigation and preparation
-Conduct a comprehensive survey of the existing grounding network of Huanshan Substation to understand the layout of the grounding network,materials,depth of burial and other conditions.
-According to the results of the survey,make a detailed reconstruction plan,specify the construction scope,material requirements,construction period,etc..
-Prepare materials,tools and equipment required for construction to ensure the smooth progress of construction.
2.Grounding network renovation
-Clean up the construction site to ensure that the construction area is free of debris and water.
-Excavate the grounding network burial pit,according to the design requirements of the depth and size of the excavation.
-Pave the grounding network in the excavated pit to ensure that the grounding network is in close contact with the soil.In the grounding network poured inside a liquid grounding material with excellent conductivity, the use of liquid seepage, fill the pores between the pebbles, and then quickly solidify the results of jelly-like colloid close to the surface of the stone, greatly increasing the effective contact area between the medium, the non-conductive stone cleverly transformed into a conductor, the rock, pebbles, and HD-M1 nano-crystalline grounding module, galvanised flat steel, electroforming Copper rods and other grounding devices naturally combined, tightly connected, forming a water-rich (no longer dissolved in the rain, electrolyte will not be lost to pollute the environment), with high impact resistance, and resistivity to maintain a very low and long-term stability of the composite grounding network, and greatly improve the grounding environment of the substation.
-Connect the grounding grid with the equipment in the substation to ensure that the grounding resistance meets the requirements.
-Backfill the grounding network to ensure that the backfill material is tight and without gaps.
3.Lightning protection equipment installation
-Install the lightning arrester at the key position of the substation,and make sure the lightning arrester is well connected with the grounding network.
-Check whether the rated voltage,continuous operation voltage,maximum current capacity and other parameters of the lightning arrester meet the design requirements.
-Commission and test the lightning arrester to ensure its normal operation.
4.Acceptance and testing
-After the completion of construction,the grounding network and lightning arrester for a comprehensive inspection and acceptance,to ensure that the construction quality meets the requirements.
-Use professional testing equipment to test the grounding resistance to ensure that the grounding resistance is not greater than 0.5 ohm.
-Perform lightning impact test on the lightning arrester to ensure that its lightning protection performance meets the requirements.
IV.The effect of assessment
After the transformation and upgrading of Huanshan substation grounding network lightning protection system,its lightning protection capacity has been significantly improved.Lightning protection and grounding engineering design requirements 0.5Ω,the actual results of 0.48Ω.In the season of frequent lightning activity,the substation's lightning tripping rate is significantly reduced,the stability of equipment operation has been effectively safeguarded.At the same time,the reduction of grounding resistance also improves the current dissipation capacity of the grounding network,reducing the risk of lightning damage to equipment.
V.Conclusion and Prospect
Through the comprehensive transformation and upgrading of the grounding network of Huanshan substation,the lightning protection capability of the substation has been effectively improved,providing a strong guarantee for the safe and stable operation of the power grid.
After 16 years, the Huanshan substation is still running stably. Nowadays, flexible grounding technology has been promoted to the whole country, for the majority of power systems and new energy power generation project owners to overcome countless problems. As one of the core technologies of the Lightning Protection Technology Service Centre of the electric power industry, the flexible grounding technology is more mature and precise compared to more than ten years ago, and the flexible grounding electrode HD-R10 has been tested by the TÜV Rheinland IEC standard, and its resistance reduction efficacy has far exceeded the requirements of the IEC standard, and it complies with the national and European Union environmental protection standards, and it is at the leading level in the international arena.
At present, it has won many honours, including the first prize of ‘Golden Bridge Award’ of China Technology Market Association, Certificate of Scientific and Technological Achievement of China High-tech Science and Technology, Electricity Innovation Award of China Electricity Council, and International Invention Award of Geneva. In the future, we will continue to strengthen the maintenance and monitoring of the lightning protection system of the grounding network, timely detection and treatment of potential safety hazards to ensure the long-term stable operation of the power grid.
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