This standard specifies the levels of various microclimate conditions that the internal parts (basic parts, components and internal equipment) of the product may encounter when it is used under the climatic conditions of GB 4798.3 or GB 4798.4. The characteristic parameters of the microclimate are high air temperature and low relative humidity. Some other climatic parameters such as low temperature may also have additional effects on the parts, but this standard does not take them into account. Taking into account the representative extreme high temperatures, a limited number of microclimate levels are specified. Users of this standard should choose the lowest level that can meet the intended use. GB/T 4798.9-1997 Environmental conditions for the application of electrical and electronic products Microclimate inside the product GB/T4798.9-1997 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T 4798. 91997
idt IEC 721-3-9:1993
Environmental conditions existing in applicationof electric and electronic products-Microclimates inside products
Environmental conditions existing in applicationof electric and electronic products-Microclimates inside products1997-12-26 Issued
National Technical Supervision Bureau
1998-12-01 Implementation
GB/T 4798.9-1997
IEC Foreword
1 Model diagram
2 References
3 Definitions
5 Classification of microclimates
6 Types and representation of climate levels
Appendix A (Appendix for superscripts) Graphical representation and priority of climate levels
GB/T 4798.9-1997
This standard adopts the international standard C721-3-1997, Section 9, Classification of environmental parameters and their severity groups, first edition in 1993 and its first extension document (1994-12) and correction to the first energy standard document (1995). This standard is the 9th part of the application environment conditions of electrical and electronic products. The names of the other parts are: GB1798.1-86 Application environment conditions for electric and electronic products GH/T4798.2-1S96 Application environment conditions for electric and electronic products GB4798.3-90 Application environment conditions for electric and electronic products Fixed use in places with air protection GB4798.4-90 Environmental conditions for electric and electronic products Fixed use without weather protection GB4798.5-87 Application environment conditions for electric and electronic products Use in ground vehicles GB/4798.6-1996 Electric and electronic products Product application environment requirements CB4798.7-87 Application environment conditions for electric and electronic products for marine and non-fixed use GB479B:10-1 External environment requirements for electric and electronic products This standard is basically based on GB4798.3-90 and GB4798.4-90 to consider the changes in the internal environment of the product due to external heating or self-heating. Therefore, the microclimate severity level code is based on the climate codes in GB1798.3-90 and CB4798.4-90 by adding high temperature and related relative condensation levels. Therefore, this standard specifies a conversion method for obtaining the relative humidity of the air inside the product, which is also the reason why the technical standard is equivalent to [EC:721391093. Appendix A of this standard is a reminder of the pump.
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China, and this standard is organized by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. The drafting unit of this standard is Guangzhou Electric Power Research Institute of the Ministry of Machinery Industry. The author of this standard is Xie Jianhua.
This standard is organized by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products. GA/T 479E-5-1997
TEC Foreword
1) IEC (International Electrotechnical Commission) is a world-wide standardization maintenance center composed of national electrotechnical committees (IEC National Committees). Its purpose is to promote international cooperation on standardization issues in the electrical and electronic fields. For this purpose, it publishes international standards in addition to other activities. These standards are entrusted to technical committees for drafting. Any national committee interested in the standard items included in the plan can participate in the initiation of this standard. International organizations, governments and non-governmental organizations that have contact with IEC also participate in this work. C and ISU (International Standardization Organization) cooperate closely under the conditions stipulated in the letter of negotiation between the two organizations. 2>1: Resolutions on relevant issues are made by technical committees that have special interests in the issue. These resolutions or agreements should express the views of the majority of countries on the issue as accurately as possible. 3) These resolutions or agreements have the form of recommendations and are published in the form of standards, technical reports or manuals for various countries to use. For example, the national committees will submit the above-mentioned materials to the relevant departments for consultation. 4) In order to promote international unification, the national committees will commit to using the quality of the national standards and regional standards in the maintenance of quality standards. The IEC standards are used faithfully within the scope of the specification as much as possible. Any differences between national standards and environmental standards should be clearly indicated in the latter.
5) IEC does not specify the order in which the approval mark is marked. Therefore, we are not responsible for any equipment claiming to comply with IEC standards. International Standard [EC.721-3-9] was prepared by IEC Technical Committee 75 (Classification and grading of environmental conditions). The text of this standard is based on the following documents: DIS
TE(CO)RG
Full voting information on the approval of this standard can be found in the voting report in the table above. Voting Report
75(C0)99
IFC721 has the following parts under the general title of Classification of environmental conditions: 1990 Edition
Part 1: Environmental parameters and their severity levels Part 2: Environmental conditions for products under the control of the manufacturer
Part 3: Classification of environmental parameters and their severity levels 1 Scope
National Standard of the People's Republic of China
Environmental conditions for application of electrical and electronic products
Microclimate inside the product
Rnylroruroental couditlone txisting in ppllcelinnof electric and electraulc praducts-Microclinates inside productsGB/T 4798.91997
idt Ik 721-3-9:1993
This standard specifies the grades of various possible continuous conditions of the internal components (basic parts, assemblies and internal installations) of the products when they are used under the atmospheric conditions of GB4793.3 or GB4708.4. The characteristic parameters of microclimates are relative temperature and low relative humidity. Some other atmospheric parameters such as low temperature may also have an effect on the components, but this standard does not consider the extreme temperature which may represent my nature, and specifies the grade of relative humidity. The user of this standard should select the most suitable grade for the intended use. 2 Standard References
The texts contained in the following standard numbers constitute the provisions of this standard through reference in this standard. When the standard is published, the version indicated is valid. All standards may be revised. Please note that the latest version of the following standards may be used. G47-84 Classification and severity of environmental parameters for electrical products EC721-1:1>GB783-90 Environmental conditions for application of electrical products - Fixed use in places with airtight protection (1EC21-3-519873
GB 478.4--90
Environmental conditions for application of electrical products - Fixed use in places with airtight protection (r4IEC721-3-41987)
G1798.10-9 Environmental conditions for application of electrical products - Including 9EC721-3-:1984) IEC721-2-1:1982 In addition to the definitions in G134756-B4 Section 3, this standard also uses the following definitions: 3.1 Climate microclimate
Climate conditions of the components installed inside the product. Only the sensitive air temperature and air humidity are considered. 3.2 Microclimate levels mtcraalimaticclas are divided into three parts: the climate level specified by GB47S8.3 or GB4798.4, the high temperature level in Table 1 and the relative air condensation limit associated with the severity level of the climate level in Table 11. National Technical Supervision 1997-12-26 approved 1998-12-01 implementation
Environmental protection
) Commercial air humidity
b) Relative air type room
GB/T 4798.9-1997
Table 1 Classification of microclimate components
Code
The microclimate where the components are installed in the product may differ significantly from the climatic conditions to which the product is subjected. Severity level
Microclimate refers to the climate of the components installed inside the product's closed body. The micro-air recovery range is basically in GB1798.3 or GB4798.4, plus high air temperature and limited relative air humidity, to take into account the external heating or measurable self-heating of the product during operation. This climate can also represent the operating conditions of the component. When the temperature inside the product is higher than the ambient temperature of the product itself, the relative humidity of the air decreases, thereby also reducing the moisture stress of the component. Even in an environment with a relative humidity of up to 1% of air, the temperature increases by 10%, and the relative humidity of the air inside the product decreases to below 65%. Below this level, the corrosive effect of chemically active substances is very small. The severe climate mentioned in this standard is related to the position of the component in the outdoor environment. The air inside the outdoor environment can communicate with the surrounding air more freely. If air can enter the shell (such as non-airtight packaging), the moisture absorbed into the shell will continuously transform into water, which may form more severe conditions. This phenomenon may be caused by frequent switching on and off of the power supply of the product or by the rapid change of the climatic conditions outside the product, such as rain and sunlight, which causes the temperature inside the product to change rapidly. If the components inside the product are not affected by external heating or self-heating, or are in a non-operating state for a long time, they will be directly affected by the various conditions specified by the climate level of the product. In particular, whether the components inside the product are affected by external heating or self-heating, as long as the climate conditions change, the length of time the components withstand this change should be considered. The control and delay time of each climate condition change should use the specified values ​​of GH4798.11, and more detailed guidance is CB4758.1.
5 Classification and grading of microclimate conditions
Table 1 specifies a series of high air humidity and limited air relative humidity levels for the climate level. The code and table examples of the climate level are shown in Chapter 6. Special conditions may require different severity levels from the table. They are directly taken from GB4796. Appendix A1 gives the method of calculating the microclimate using a table. With this, two characteristic inflection points can be calculated. Appendix A Table A1 and Table A2 give many pairs of air volume and relative mixing to select the preferred microclimate. The method described in Appendix A is applicable to the stage where the micro-air system has reached a certain state. 6 Types and codes of air grades
The combined climate grade is indicated by the appropriate product climate grade code and the appropriate grade code given in Table 1. 2
Agent 1 only indicates the increased air temperature.
Microclimate level
84K2/K2
GB/T4798.9—1997
High air temperature level
Climate level
Example 2 Increased air temperature and limited air relative humidityMicroclimate level
4K2/X2/13
Limited air relative humidity level
High air temperature level
Climate level
Example 3 The direct effect of increased air relative humidity, limited air relative humidity and climate level within a limited time, microclimate level
4K2/2/Y3+1 month per year4K2
Relative air humidity level within a limited time specified in Table 3 of GB4799.10
High air temperature level
Climate level
A! Graphical representation of microclimate levels
GR/T4798.9—1997
(Appendix to the specification)
The microclimate levels and the inverse model diagram and A1 are based on the standard humidity state diagram specified in Appendix n of IEC721-2-1:1982. Figure A is an example of the microclimate level 4K2/X2/Y1. The characteristic points and lines of the climate diagram are obtained by the following method. Draw a climate diagram of the climate level 4K2
Use A, BC, DE to mark the following points:
Point A is the high air mixing point under the high air absolute humidity: B is the high air relative humidity point under the high air absolute humidity, C is the low air temperature point under the high air relative humidity: D is the low air relative humidity point under the low air absolute humidity, and D is the high air relative humidity point under the low air relative humidity. Determine the difference between the air temperature of the micro-atmosphere (70°C) and the air temperature of the high-altitude atmosphere (40°C) or 30%. Move the obtained points A-F on the air constant line so that the temperature difference is 30°C and mark the obtained points A--E. Draw the boundary line with the relative air temperature &5 and mark the intersection with B and C. Draw the air model of the gap ABCD and E. Note that this method of changing the air flow rate is not correct for the closed system. For the open system, the change should be made on the constant pressure system. Since the error is not large when the temperature is set, , this transformation method is applicable to the non-conventional system. In this case, the microclimate diagram of the microclimate level 4Ka/X2/Y3 is composed of the envelope of ABsC:L' and E: the microclimate during the period of self-heating with external heating is the area enclosed by the line segments A', ', C\.D'.F\. In the climate diagram shown in Figure A1, the two points A and B have the following meanings: A is the high air temperature of the climate with external heating and the air humidity associated with it: A is the air humidity associated with the microclimate with external heating or heating. These two inflection points indicate the product during the period of self-heating with external heating. The temperature display shows the total fire power range of the unit, and can show the relative condensation value of the air source at the main point of the gas family bacteria market. The temperature values ​​of other points in the same gas reading diagram are generally not very important.
A2 priority microclimate table
GB/T4798.91997
Plastic air humidity in ../m:
High air phase is required
Making gas fast field
ABCDE
External constant second model research
Self-heating gas drying|| tt||Air certificate seat
Figure 1 shows the diagram of micro-explosion and air washing
Micro-point temperature green sheet 2//3
F draws the measurement band for the hypothetical grade of the slow air in the air chart A1, the paired air temperature and relative air leakage value of the two reporting points A and B
are the characteristics of the air conditioner grade and the two severe grades
air pump degree control and humidity
climate protection place
clear point severity grade
high air
quality belt line
high air
temperature grade
GB/T 479B. 9-·1997
Table A1 (complete)
Air humidity/relative humidity
Table A2 Characteristic parameters and severity levels of microclimate levels
Air temperature/relative humidity
Severity level of inflection point
Airless sheltered areas
Severity equivalent of marked points1.
5 Classification and grading of microclimate equipment
Table 1 specifies a series of high air humidity and relative air humidity levels for a series of microclimate grades. The codes and table examples of microclimate grades are shown in Chapter 6. Special equipment may require different severity levels from those in Table 1. The specific requirements are based on GB4-96. Appendix A1 gives the method of calculating the microclimate using tables. With this, two characteristic inflection points can be calculated. Tables A1 and A2 of Appendix A give many pairs of air humidity and relative mixing characteristics for selecting preferred microclimate grades. The method described in Appendix A is applicable to the stage where the microclimate system has reached a certain state. 6 Types and codes of microclimate grades
Combined climate grades are indicated by appropriate product climate grade codes and appropriate grade codes in Table 1. 2
Agent 1 only indicates elevated air temperature.
Microclimate level
84K2/K2
GB/T4798.9—1997
High air temperature level
Climate level
Example 2 Increased air temperature and limited air relative humidityMicroclimate level
4K2/X2/13
Limited air relative humidity level
High air temperature level
Climate level
Example 3 The direct effect of increased air relative humidity, limited air relative humidity and climate level within a limited time, microclimate level
4K2/2/Y3+1 month per year4K2
Relative air humidity level within a limited time specified in Table 3 of GB4799.10
High air temperature level
Climate level
A! Graphical representation of microclimate levels
GR/T4798.9—1997
(Appendix to the specification)
The microclimate levels and the inverse model diagram and A1 are based on the standard humidity state diagram specified in Appendix n of IEC721-2-1:1982. Figure A is an example of the microclimate level 4K2/X2/Y1. The characteristic points and lines of the climate diagram are obtained by the following method. Draw a climate diagram of the climate level 4K2
Use A, BC, DE to mark the following points:
Point A is the high air mixing point under the high air absolute humidity: B is the high air relative humidity point under the high air absolute humidity, C is the low air temperature point under the high air relative humidity: D is the low air relative humidity point under the low air absolute humidity, and D is the high air relative humidity point under the low air relative humidity. Determine the difference between the air temperature of the micro-atmosphere (70°C) and the air temperature of the high-altitude atmosphere (40°C) or 30%. Move the obtained points A-F on the air constant line so that the temperature difference is 30°C and mark the obtained points A--E. Draw the boundary line with the relative air temperature &5 and mark the intersection with B and C. Draw the air model of the gap ABCD and E. Note that this method of changing the air flow rate is not correct for the closed system. For the open system, the change should be made on the constant pressure system. Since the error is not large when the temperature is set, , this transformation method is applicable to the non-conventional system. In this case, the microclimate diagram of the microclimate level 4Ka/X2/Y3 is composed of the envelope of ABsC:L' and E: the microclimate during the period of self-heating with external heating is the area enclosed by the line segments A', ', C\.D'.F\. In the climate diagram shown in Figure A1, the two points A and B have the following meanings: A is the high air temperature of the climate with external heating and the air humidity associated with it: A is the air humidity associated with the microclimate with external heating or heating. These two inflection points indicate the product during the period of self-heating with external heating. The temperature display shows the total fire power range of the unit, and can show the relative condensation value of the air source at the main point of the gas family bacteria market. The temperature values ​​of other points in the same gas reading diagram are generally not very important.
A2 priority microclimate table
GB/T4798.91997
Plastic air humidity in ../m:
High air phase is required
Making gas fast field
ABCDE
External constant second model research
Self-heating gas drying|| tt||Air certificate seat
Figure 1 shows the diagram of micro-explosion and air washing
Micro-point temperature green sheet 2//3
F draws the measurement band for the hypothetical grade of the slow air in the air chart A1, the paired air temperature and relative air leakage value of the two reporting points A and B
are the characteristics of the air conditioner grade and the two severe grades
air pump degree control and humidity
climate protection place
clear point severity grade
high air
quality belt line
high air
temperature grade
GB/T 479B. 9-·1997
Table A1 (complete)
Air humidity/relative humidity
Table A2 Characteristic parameters and severity levels of microclimate levels
Air temperature/relative humidity
Severity level of inflection point
Airless sheltered areas
Severity equivalent of marked points1.
5 Classification and grading of microclimate equipment
Table 1 specifies a series of high air humidity and relative air humidity levels for a series of microclimate grades. The codes and table examples of microclimate grades are shown in Chapter 6. Special equipment may require different severity levels from those in Table 1. The specific requirements are based on GB4-96. Appendix A1 gives the method of calculating the microclimate using tables. With this, two characteristic inflection points can be calculated. Tables A1 and A2 of Appendix A give many pairs of air humidity and relative mixing characteristics for selecting preferred microclimate grades. The method described in Appendix A is applicable to the stage where the microclimate system has reached a certain state. 6 Types and codes of microclimate grades
Combined climate grades are indicated by appropriate product climate grade codes and appropriate grade codes in Table 1. 2
Agent 1 only indicates elevated air temperature.
Microclimate level
84K2/K2
GB/T4798.9—1997
High air temperature level
Climate level
Example 2 Increased air temperature and limited air relative humidityMicroclimate level
4K2/X2/13
Limited air relative humidity level
High air temperature level
Climate level
Example 3 The direct effect of increased air relative humidity, limited air relative humidity and climate level within a limited time, microclimate level
4K2/2/Y3+1 month per year4K2
Relative air humidity level within a limited time specified in Table 3 of GB4799.10
High air temperature level
Climate level
A! Graphical representation of microclimate levels
GR/T4798.9—1997
(Appendix to the specification)
The microclimate levels and the inverse model diagram and A1 are based on the standard humidity state diagram specified in Appendix n of IEC721-2-1:1982. Figure A is an example of the microclimate level 4K2/X2/Y1. The characteristic points and lines of the climate diagram are obtained by the following method. Draw a climate diagram of the climate level 4K2
Use A, BC, DE to mark the following points:
Point A is the high air mixing point under the high air absolute humidity: B is the high air relative humidity point under the high air absolute humidity, C is the low air temperature point under the high air relative humidity: D is the low air relative humidity point under the low air absolute humidity, and D is the high air relative humidity point under the low air relative humidity. Determine the difference between the air temperature of the micro-atmosphere (70°C) and the air temperature of the high-altitude atmosphere (40°C) or 30%. Move the obtained points A-F on the air constant line so that the temperature difference is 30°C and mark the obtained points A--E. Draw the boundary line with the relative air temperature &5 and mark the intersection with B and C. Draw the air model of the gap ABCD and E. Note that this method of changing the air flow rate is not correct for the closed system. For the open system, the change should be made on the constant pressure system. Since the error is not large when the temperature is set, , this transformation method is applicable to the non-conventional system. In this case, the microclimate diagram of the microclimate level 4Ka/X2/Y3 is composed of the envelope of ABsC:L' and E: the microclimate during the period of self-heating with external heating is the area enclosed by the line segments A', ', C\.D'.F\. In the climate diagram shown in Figure A1, the two points A and B have the following meanings: A is the high air temperature of the climate with external heating and the air humidity associated with it: A is the air humidity associated with the microclimate with external heating or heating. These two inflection points indicate the product during the period of self-heating with external heating. The temperature display shows the total fire power range of the unit, and can show the relative condensation value of the air source at the main point of the gas family bacteria market. The temperature values ​​of other points in the same gas reading diagram are generally not very important.
A2 priority microclimate table
GB/T4798.91997
Plastic air humidity in ../m:
High air phase is required
Making gas fast field
ABCDE
External constant second model research
Self-heating gas drying|| tt||Air certificate seat
Figure 1 shows the diagram of micro-explosion and air washing
Micro-point temperature green sheet 2//3
F draws the measurement band for the hypothetical grade of the slow air in the air chart A1, the paired air temperature and relative air leakage value of the two reporting points A and B
are the characteristics of the air conditioner grade and the two severe grades
air pump degree control and humidity
climate protection place
clear point severity grade
high air
quality belt line
high air
temperature grade
GB/T 479B. 9-·1997
Table A1 (complete)
Air humidity/relative humidity
Table A2 Characteristic parameters and severity levels of microclimate levels
Air temperature/relative humidity
Severity level of inflection point
Airless sheltered areas
Severity equivalent of marked pointsThe area covered by F\. In the climate diagram shown in Figure A1, the meanings of the two points A and B are as follows: A: The high air temperature of the climate diagram with heating or heating of the body is related to the relative humidity of the air: The low air temperature of the climate diagram with heating or heating of the body is related to the relative humidity of the air. These two inflection points indicate the relative humidity of the air during the external heating period, and can also indicate the relative humidity of the air at the main points. The temperature values ​​of other points in the same climate diagram are generally not very important.
A2 priority microclimate table
GB/T4798.91997
Plastic air to humidity in ../m:
High air relative to the loan to use
Make air version 4K2X8/Y3
Air fast field
ABCDE
External constant two models research
Self-heating air drying
Air certificate seat
Figure 1 Micro air explosion air washing diagram plan
Micro point climate green sheet 2//3
F draws the air temperature and relative air leakage value of the two reporting points A and B in the air quality graph A1, and makes the characteristics of the air quality level and the severe level two
five degree level
air pump degree control air and the humidity
weather protection place
clear point severity level
high air
quality belt line
high air
temperature level
GB/T 479B. 9-·1997
Table A1 (complete)
Air humidity/relative humidity
Table A2 Characteristic parameters and severity levels of microclimate levels
Air temperature/relative humidity
Severity level of inflection point
Airless sheltered areas
Severity equivalent of marked pointsThe area covered by F\. In the climate diagram shown in Figure A1, the meanings of the two points A and B are as follows: A: The high air temperature of the climate diagram with heating or heating of the body is related to the relative humidity of the air: The low air temperature of the climate diagram with heating or heating of the body is related to the relative humidity of the air. These two inflection points indicate the relative humidity of the air during the external heating period, and can also indicate the relative humidity of the air at the main points. The temperature values ​​of other points in the same climate diagram are generally not very important.
A2 priority microclimate table
GB/T4798.91997
Plastic air to humidity in ../m:
High air relative to the loan to use
Make air version 4K2X8/Y3
Air fast field
ABCDE
External constant two models research
Self-heating air drying
Air certificate seat
Figure 1 Micro air explosion air washing diagram plan
Micro point climate green sheet 2//3
F draws the air temperature and relative air leakage value of the two reporting points A and B in the air quality graph A1, and makes the characteristics of the air quality level and the severe level two
five degree level
air pump degree control air and the humidity
weather protection place
clear point severity levelwwW.bzxz.Net
high air
quality belt line
high air
temperature level
GB/T 479B. 9-·1997
Table A1 (complete)
Air humidity/relative humidity
Table A2 Characteristic parameters and severity levels of microclimate levels
Air temperature/relative humidity
Severity level of inflection point
Airless sheltered areas
Severity equivalent of marked points
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