1、 Basic information of the standard:
Standard name: Damp and hot environmental conditions for power transmission and transformation equipment
Standard No.: NB/T 10279-2019 (Energy Industry Standard of the People's Republic of China)
This standard was issued on November 4, 2019 and implemented on May 1, 2020.
Scope of this standard: This standard specifies the environmental parameter levels and severity of power transmission and transformation equipment during service under humid and hot environmental conditions.
This standard is applicable to power transmission and transformation equipment used in areas with two climate types of 'humid heat' and 'sub humid heat' as specified in GB/T 4797.1-2018.
Note: Considering the actual environmental conditions for the use of power transmission and transformation equipment, this standard does not include marine environmental conditions, that is, hydrological conditions are not considered. But it includes humid and hot island environments.
This standard only specifies the environmental conditions that directly affect the product, but does not describe the specific impact of these environmental conditions on the product.
The environmental conditions described in this standard do not include storage, transportation, and installation. These conditions are specified in relevant standards and technical specifications.
This standard does not consider environmental conditions caused by fires, explosions, and ionizing radiation, as well as environmental conditions caused by other accidents. In special circumstances, the probability of these factors occurring should be considered.
The actual use of power transmission and transformation equipment will be affected by various environmental conditions, including climatic conditions (K), special climatic conditions (Z), biological conditions (B), chemical active substance conditions (C), mechanical active substance conditions (S), mechanical conditions (M), and electromagnetic conditions (E). For equipment located in different humid and hot areas and in different places of use, the above influential conditions and their severity should be indicated.
Taking climate conditions as an example:
3K4: This level is suitable for places with high humidity changes and temperature control, and humidity control is not adopted. The product may be affected by sources other than condensed water and rainwater. But it is not affected by natural precipitation and freezing.
3K5, 3K5L: This level is suitable for places where there is neither temperature nor humidity control. The product can be affected by solar radiation, thermal radiation, air flow condensation, and water other than rainwater, and may encounter freezing, but is not affected by natural precipitation.
3K5L: Different from 3K5 only under 'high temperature' conditions.
4K3Hs: This level is suitable for direct exposure of the product to 'humid hot' and 'sub humid hot' climate types without climate protection.
2、 GB/T 4797.1 Supplementary Notes
GB/T 4797.1 lists outdoor climate types represented by temperature and humidity parameters as background materials for selecting temperature and humidity severity levels during product testing and application.
Except for areas with elevations exceeding 5000m, these climate types include all regions of the country.
This section can also serve as background material when determining the climatic conditions for product application.
GB/T 4797.1 specifies a series of outdoor climate types based on temperature and humidity parameters, which are often used for the transportation, storage, installation, and use of products.
1. Overview
This standard references data from GB/Z32126, which collects daily temperature and humidity data from 1973 to 1992 worldwide, mainly measured at airports and major cities around the world. The relevant data in China is based on outdoor temperature and humidity data from 1971 to 2000 across the country.
2. General verification procedures
There are three main stages of data processing validation:
——Identify and collect data;
——Compare the analysis data with the current values;
——Update data appropriately.
As a result of data collection and analysis, outdoor climate types worldwide have been simplified, as shown in Table 1:
Table 1 Climate Types
New climate types | GB/T4797.1-2005 Defined climate types |
tropic | Damp heat, constant damp heat |
drought | Moderate dry heat, extreme dry heat |
temperate zone | Warm and dry heat |
frigid zone | Cold and warm |
polar region | Extreme cold, cold |
Table 2 provides the definitions for each climate type worldwide.
Climate Type | define |
tropic | Tropical rainforest climate, with an average temperature of over 18 ℃ in the coldest month |
drought | Dry climate with annual rainfall less than 500mm |
temperate zone | Temperate rainfall climate, with an average temperature of -3~18 ℃ in the coldest month |
frigid zone | Cold forest and snowy climate, with an average temperature of over 10 ℃ in the warmest month and below -3 ℃ in the coldest month |
polar region | Cold and snowy climate, with an average temperature of less than 10 ℃ in the warmest month |
3. Statistical classification of outdoor climate
The following table provides the climate types defined by outdoor climate statistics (including climate types only applicable to China). Table 3 presents the average annual extreme values of daily average temperature and humidity for various climate types (including climate types only applicable to China), Table 4 presents the average annual extreme values of temperature and humidity for various climate types (including climate types only applicable to China), and Table 5 presents the absolute extreme values of temperature and humidity for various climate types (including climate types only applicable to China).
Table 3: Various Climate Types Classified by Daily Average Extreme Values
Climate Type | The average of the annual extreme values of the daily average of temperature and humidity |
low temperature ℃ | high temperature ℃ | Maximum absolute humidity g/m3 |
tropic | 10 | 40 | 30 |
drought | 0 | 45 | 25 |
temperate zone | -15 | 40 | 25 |
frigid zone | -25 | 35 | 25 |
polar region | -40 | 25 | 15 |
humidity* | 9 | 35 | 26 |
Sub humid heat* | -5 | 34 | 26 |
dry heat* | -15 | 36 | 15 |
Warm temperature* | -16 | 33 | 25 |
Cold and warm I* | -39 | 31 | 11 |
Cold and warm II* | -34 | 23 | 21 |
coldness * | -40 | 28 | 18 |
Note: The climate types marked with * refer to China's climate classification and are only applicable to China. Please refer to Appendix B for climate data of various locations in China's climate types |
Table 4: Various Climate Types Classified by Annual Extreme Values
Climate Type | The average of annual extreme values of temperature and humidity |
low temperature ℃ | high temperature ℃ | Maximum absolute humidity g/m3 |
tropic | 5 | 45 | 35 |
drought | -10 | 50 | 30 |
temperate zone | -20 | 40 | 30 |
frigid zone | -45 | 45 | 25 |
polar region | -50 | 30 | 20 |
humidity* | 3 | 40 | 31 |
Sub humid heat* | -10 | 40 | 28 |
dry heat * | -21 | 45 | 21 |
Warm temperature* | -20 | 40 | 27 |
Cold and warm I* | -35 | 40 | 15 |
Cold and warm II* | -32 | 31 | 23 |
coldness * | -45 | 35 | 20 |
Note: The climate types marked with * refer to China's climate classification and are only applicable to China. Please refer to Appendix B for climate data of various locations in China's climate types |
Table 5: Various Climate Types Classified by Absolute Extreme Values
Climate Type | Absolute Extreme Values of Temperature and Humidity |
low temperature ℃ | high temperature ℃ | Maximum absolute humidity g/m3 |
tropic | 0 | 50 | 40 |
drought | -20 | 55 | 35 |
temperate zone | -30 | 50 | 35 |
frigid zone | -50 | 45 | 30 |
polar region | -60 | 35 | 25 |
humidity* | 0 | 40 | 35 |
Sub humid heat* | -19 | 45 | 34 |
dry heat* | -30 | 49 | 25 |
Warm temperature* | -31 | 43 | 31 |
Cold and warm I* | -41 | 45 | 20 |
Cold and warm II* | -45 | 37 | 28 |
coldness* | -50 | 40 | 26 |
Note: The climate types marked with * refer to China's climate classification and are only applicable to China. Please refer to Appendix B for climate data of various locations in China's climate types |
3、 Standard drafting unit:
4、ORT participated in drafting and published standards:
1. GB/T 35774-2017 'Specification for Performance Testing of Transport Packaging Components'
2. GB/T 4857.1-2019 'Basic Testing of Packaging, Transportation, and Packaging Components - Part 1: Marking Methods for Various Parts during Testing'
3. GB/T 4798.1-2019 'Classification of Environmental Conditions - Classification of Environmental Parameter Groups and Classification of Their Severity - Part 1: Storage'
4. GB/T 2421-2020 'Overview and Guidelines for Environmental Testing'
5. GB/T 2423.27-2020 'Environmental Testing - Part 2: Test Methods, Test Methods and Guidelines: Temperature/Low Pressure or Temperature/Humidity/Low Pressure Combined Tests'
6. GB/T 2423.51-2020 'Environmental Testing - Part 2: Test Methods - Test Ke: Flow Mixed Gas Corrosion Test'
7. GB/T 32065.8-2020 Marine Instruments - Environmental Testing Methods - Part 8: Temperature Change Test
8. GB/T 32065.10-2020 Marine Instruments - Environmental Testing Methods - Part 10: Salt Spray Test
9. GB/T 4797.9-2021 Classification of Environmental Conditions - Natural Environmental Conditions - Shock and Vibration Data Measured during Storage, Transportation, and Use
10. GB/T 2423.33-2021 Environmental Testing Part 2: Test Methods Test Kca: High Concentration Sulfur Dioxide Test
11. GB/T 2423.18-2021 Environmental Testing Part 2: Test Methods Test Kb: Salt Spray, Alternating (Sodium Chloride Solution)
12. NB/T 10279-2019 'Wet and Hot Environmental Conditions for Transmission and Transformation Equipment'
13. NB/T 10280-2019 'Wet and Hot Environmental Conditions and Technical Requirements for State Monitoring Devices Used in Power Grids'
14. YZ/T 0174-2020 Technical Requirements for Cold Chain Delivery Insulation Box
15. T/CPF 0012-2020 Guidelines for Testing Small Transport Packages for Express Delivery
16. T/CPF 0011-2020 Guidelines for Testing Electrical Transportation Packaging in E-commerce Logistics