The latest core product standard for Lightning Arresters is GB/T 11032-2020, which was implemented on July 1, 2021 and replaced the previous 2010 version. Meanwhile, another important standard that is highly relevant to your query, GB/T 28547-2023 "Guidelines for the Selection and Use of AC Metal Oxide Surge Arresters", was released on December 28, 2023 and will be implemented from April 1, 2024, replacing the 2012 version. This document provides important guidance for the correct selection and application of lightning arresters.
Therefore, for 10kV lightning arresters, we need to comprehensively consider the requirements of these two standards. Below, I will outline the potential impacts of these updates and provide suggestions for addressing them.
Changes in Core Standards and Key Points for Selection and Application of 10kV Surge Arresters
The following table summarizes the key points to pay attention to when selecting and applying 10kV lightning arresters:
Focus on dimensions | Key changes and key points | Specific impacts and strategies on 10kV lightning arresters |
Standard System | - GB/T 11032-2020 modified to adopt IEC 60099-4:2014-GB/T 28547-2023 provides detailed guidance for selection and application | - Technical requirements improvement: The design and testing requirements for lightning arresters are more stringent, promoting product performance and quality improvement. -The selection is based on evidence: it provides clearer parameter basis for selecting 10kV lightning arresters in different lightning activity areas (low lightning area, medium lightning area, high lightning area, strong lightning area) and different line importance conditions. |
Lightning protection requirements | Based on lightning ground flash density and line importance, refine the selection of lightning withstand parameters for lightning arresters: | - In areas with general lightning intensity (ground flash density<4.71 times/km 2 · year), lightning arresters with a nominal discharge current of 5kA and a high current impulse withstand of 65kA can be selected. -Strong lightning areas and important power lines (ground flash density ≥ 4.71 times/km 2 · year): It is recommended to use lightning arresters with a nominal discharge current of 10kA and a high current impulse withstand of 100kA. |
Detacher and Fault Indication | GB/T 28547-2023 covers recommendations for the selection and application of disConnectors for lightning arresters.-Detacher: In case of lightning arrester failure, it can disconnect from the system and provide visible identification. -Fault indicator: It only indicates faults and may not have a detachment function. | - Enhance safety and maintainability: It is recommended to choose lightning arresters equipped with reliable disconnectors, which can be shut down in a timely manner in case of failure, avoid the expansion of accidents, and facilitate the detection of inspection personnel. -Pay attention to product quality: Ensure that the long-term operating current and minimum operating current parameters of the disconnector are matched with the lightning arrester and system. |
Testing and Quality | - Emphasize that the high current impulse withstand test should be conducted on the entire lightning arrester body. -GB/T 11032-2020 has made significant modifications to the test methods and requires an increase. | - Ensure true and reliable performance: This requirement helps identify potential defects in the structure and process of the lightning arrester body, and promotes production process improvement. When purchasing, attention can be paid to whether the manufacturer strictly adheres to this test regulation. |
Response strategies and suggestions
Based on the above changes, in order to ensure the safe and reliable operation of the 10kV lightning arrester, it is recommended that you adopt the following strategies:
-Accurate selection is the core
-Firstly, evaluate the level of lightning activity in the area where the line is located (referring to the local meteorological department's ground flash density data) and the importance of the line.
-Strictly follow the parameter recommendations in the above table to choose the appropriate lightning arrester. For critical lines with multiple and strong lightning areas, the habit of using a single parameter configuration in the past should no longer be followed, and higher grade lightning arresters must be selected.
-Strengthen operation, maintenance, and monitoring
-Utilize the visible markings provided by the disconnector to strengthen observation during daily line patrols, promptly detect and replace faulty lightning arresters.
-According to the standard requirements, regularly measure the power frequency reference voltage of the lightning arrester and compare it with the initial value and previous measurement values. If a significant decrease is found (for example, if the reference voltage of lightning arresters of 110kV and above drops by more than 10%, it should be alerted), monitoring should be strengthened to identify the cause. If it is indeed caused by aging, consideration should be given to shutting down the operation. This measurement also has reference value for the state assessment of 10kV lightning arresters.
-Promote technological upgrading and supply chain management
-As a user, it is explicitly required in the bidding and technical specifications that lightning arresters must comply with the latest standards such as GB/T 11032-2020 and GB/T 28547-2023.
-As a manufacturer, we should actively upgrade our technology, optimize production processes, and ensure that our products (especially the entire lightning arrester) can pass more rigorous type tests. At the same time, the applicable lightning zones and key parameters should be clearly marked in the product description to guide users in selecting the correct type.
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