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NB/T 10291-2019: (Test method for equivalent accelerated life of daily-use tubular electric heating elements for heating air)
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(Test method for equivalent accelerated life of daily-use tubular electric heating elements for heating air)
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NB/T 10291-2019
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Basic data | Standard ID | NB/T 10291-2019 (NB/T10291-2019) | | Description (Translated English) | (Test method for equivalent accelerated life of daily-use tubular electric heating elements for heating air) | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | K10 | | Classification of International Standard | 29.120.01 | | Word Count Estimation | 13,159 | | Date of Issue | 2019-11-04 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | National Energy Administration | NB/T 10291-2019: (Test method for equivalent accelerated life of daily-use tubular electric heating elements for heating air)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method of equivalent accelerated aging of daily-use metallic tube electric heating elements for air-heating
ICS 29.120.01
K 10
NB
Energy Industry Standards of the People's Republic of China
Daily tubular electric heating element for heating air
Equivalent accelerated life test method
2019-11-04 released
2020-05-01 implementation
Issued by National Energy Administration
Table of contents
Preface...2
Introduction...3
1 Scope...4
2 Normative references...4
3 Terms and definitions...4
4 Experimental design...5
5 Information...6
6 Test equipment and environmental requirements...6
7 Test requirements...7
8 Test method and judgment...8
Appendix A (informative appendix) Limit working temperature of commonly used materials for components...10
References...11
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Electrical Equipment Industry Association.
This standard is under the jurisdiction of the National Electrical Accessories Standardization Technical Committee (SAC/TC 67).
The organization responsible for drafting this standard. Dongguan Zhiheng Household Appliances Technology Co., Ltd., Weikai Testing Technology Co., Ltd., Chaohu Jiukang Electric
Co., Ltd., Zhenjiang Dongfang Electric Heating Technology Co., Ltd., Shenzhen Jiyang Intelligent Technology Co., Ltd., Jiangsu Datang Electric Manufacturing Co., Ltd.,
Xiamen Langxing Ship Lighting Co., Ltd., Xi'an Yuanzheng Automation Control Co., Ltd.
Participated in the drafting of this standard. Anhui Xinghui Industrial Technology Co., Ltd., Anhui Zhuoyue Power Equipment Co., Ltd., Chaohu Yinhuan Navigation Mark
Co., Ltd., Anhui Anze Electrical Co., Ltd., China National Electrical Research Institute Co., Ltd., Xiamen Langxing Energy-saving Lighting Co., Ltd.
Company, Yiwu Riqing Household Products Co., Ltd., Xi'an Yuntuo Electric Co., Ltd., Xuzhou Ruxin Intelligent Technology Co., Ltd., Xi'an Kaiyijin
Electronic Technology Co., Ltd., Shanghai Yangya Solar Energy Co., Ltd.
The main drafters of this standard. Lu Minguo, Zhuang Weiwei, Chen Youyong, Tan Wei, Cai Jun, Yang Rukun, Tang Wei, Bai Luming, Nan Zheng, Zhu Shan
Hui, Zhao Jianping, Xu Yujun, Cheng Nailiang, Kong Ruixun, Qian Feng, Chen Zipeng, Zhang Wei, Zheng Haifeng, Ni Zan, Liu Jinhua, Li Jun.
Introduction
Carry out the time and measurement of routine life test of daily tubular electric heating elements for heating air (hereinafter referred to as "elements") according to the design conditions
The high trial cost is not conducive to product development and sales. In order to improve social production efficiency and save social resources, this standard is formulated.
Daily tubular electric heating element for heating air
Equivalent accelerated life test method
1 Scope
This standard specifies the equivalent accelerated life test method for daily tubular electric heating elements (hereinafter referred to as "elements") for heating air.
This standard is applicable to heating appliances installed in household appliances, rated voltage not exceeding 480 V, and single tube rated power not exceeding 6 000 W.
Accelerated life test of tubular electric heating elements for air daily use. The components applicable to this standard are in direct contact with air and/or through fins;
When working, use static or flowing air or other gases as the medium.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) applies to this document.
GB 4706.1-2005 Safety of household and similar electrical appliances Part 1.General requirements
JB/T 4088-2012 Daily tubular electric heating element
3 Terms and definitions
The following terms and definitions defined in JB/T 4088-2012 apply to this document.
3.1
Accelerated life test accelerated aging test
On the premise of maintaining the original failure mechanism and failure mode of the product and not adding new failure factors, increase the test stress and strengthen the test strip
To accelerate the failure of the received sample, so as to predict the reliability or life characteristics of the product under normal working conditions in a short time
And a test method for evaluation.
3.2
Daily-use metallic tube electric heating elements
The metal tube is used as the shell, the alloy heating wire is used as the heating element, and the dense magnesium oxide powder or similar insulator is used as the insulating medium between the two.
And through the lead rod connected to the power supply for heating element.
3.3
Predefined working condition
The rated conditions and requirements of product design specified by the manufacturer.
3.4
Failure mechanism
Internal causes such as physical and chemical changes that cause failure.
3.5
Failure mode
The manifestation of the malfunction of the product that can be observed or measured.
3.6
Failure factor
The external cause or condition that caused the failure.
3.7
Testing stress
The input factors that directly affect the component during the test.
3.8
Working condition for testing
The test conditions and requirements during component test specified in the corresponding test clause.
3.9
Damage
The components are damaged or some electrical indicators lose their effectiveness.
Note. In this standard, a component is considered damaged when it has one of the following conditions.
--The leakage current at the operating temperature of the component cannot meet the requirements of 8.3 of this standard;
--The electrical strength at the working temperature that the component can withstand cannot meet the requirements of 8.4 of this standard;
--When the component is working, the shell produces flame, melt or other damage that cannot be repaired.
3.10
Normal use
Use the components or connected equipment according to the designed purpose and the method predetermined by the manufacturer.
3.11
Normal working condition
When the component is connected to the power supply, it is in a working state according to normal use (conditions).
3.12
Heating surface
The surface of the metal tube corresponding to the heating length of the component.
3.13
Surface load
Note. The common unit of surface load is watts per square centimeter (W/cm2).
3.14
Rated surface load
The surface load of the component under rated power conditions.
4 Experimental design
4.1 Component failure analysis
The components have different degrees of surface roughness, work hardening, residual stress, cracks, unreasonable distribution of heating wires or insulating media, etc.
trap. In the life test, the material of the component undergoes continuous oxidation and shedding and other failure mechanisms, which aggravate these defects and gradually deteriorate the performance of the component.
Retreat. The heating wire and insulating medium deteriorate, age, fuse, and decrease the electrical insulation in the high temperature environment and electrical shock of the test, which are important components
Failure mode.
4.2 Design principle of accelerated life test
Accelerated life test by increasing test stress, strengthening test conditions, amplifying failure factors, quickly exposing the defects of components, in a shorter time
Within time, it is predicted whether the components can meet the designed life requirements.
5 Information
5.1 Information required by the manufacturer
The component manufacturer shall provide sufficient information to ensure that the tests related to this standard can be carried out to confirm that the component meets the requirements of this standard.
The data required for the component testing of this standard is as specified in Table 1.
These information should be provided to the testing organization in the form of documents.
5.2 Main technical parameters and units
The main technical parameters and units involved in the components.
a) Power supply voltage, in volts (V);
b) Power frequency, in Hertz (Hz);
c) Rated voltage, in volts (V);
d) Rated power, in kilowatts (kW);
e) Working temperature, in degrees Celsius (°C);
f) Overall dimensions, in millimeters (mm);
g) Surface area, in square centimeters (cm2);
h) Time, in hours (h);
i) Heating medium.
6 Test equipment and environmental requirements
6.1 Test device
6.1.1 Regulated and regulated power supply
The output voltage should be steplessly adjustable, the output voltage fluctuation value should not exceed ±0.5%, and the power supply voltage deviation should not exceed ±3%.
6.1.2 Power on and off control device
The preset power-on time and power-off time can be adjusted separately, the power-on and power-off can be automatically cycled and the number of cycles can be preset, and the time accuracy is not
Less than 0.1 s.
6.1.3 Working condition simulation device
The components are installed in electrical appliances or under simulated conditions. The test conditions should be simulated in accordance with the test conditions specified in Chapter 7.
Test under working conditions.
6.1.4 Measuring device
In all tests, the measuring instrument or measuring device should not significantly affect the measured value.
a) Electrician measuring instruments such as electric strength detectors, leakage current detectors, etc., with an accuracy level of not less than 0.5;
b) For temperature measuring instruments, the allowable error is ±1%;
c) For humidity measuring instruments, the allowable error is within ±6% RH of the measured relative humidity.
6.2 Test environment
The temperature and humidity of the test environment shall meet the technical requirements of the corresponding use environment of the test product specified in the technical documents. If there is no document requirement,
The room temperature should be maintained at (20±5) ℃, the relative humidity of the surrounding air should not exceed 85% (when the temperature is 25 ℃), and the atmospheric environment should be at an altitude of 2 000
m or less.
There should be no flammable, explosive materials and gases in the test site.
The test personnel should make appropriate safety protection, and should use appropriate devices to fix and protect the components to avoid factors in the test process.
High temperature or insufficient electrical protection can cause personal injury or damage to the surrounding environment.
There should be no personnel frequently in the test site.
7 Test requirements
7.1 General requirements
The total number of samples required is 6 pieces, divided into 2 groups, 3 pieces in each group, and in the format of "group-serial number" from 1-1, 1-2, 1-3, 2-1 to 2-3
Encoding mark.
7.2 Test procedure
7.2.1 The samples of the first group shall be subjected to 8.2 overload fast on-off test.
7.2.2 The sample should meet the above test requirements.
7.2.3 If a sample is unqualified, select the same number of unqualified samples from the second group of samples and perform the corresponding test again.
If the test is passed, it is judged that this item is qualified, otherwise the remaining samples of the second group are selected for the test. Until the second group of samples are all tested
If there are still unqualified conditions, it is judged as unqualified.
7.2.4 Components with a rated surface load greater than 10 W/cm2 are not applicable to the test requirements of this classification. Test plan by test agency and manufacturer
Negotiation.
7.2.5 If it meets 8.2 overload fast on-off test for 3,000 cycles, it is considered that the life of the product under normal working conditions meets the requirements of this standard
Claim.
7.3 Cases where coverage testing is allowed
7.3.1 Have the same outer tube material, heating medium, heating wire and insulation medium, and have the same structure, but the same surface load
Batch components allow combined testing.
7.3.2 The components of this batch are arranged in descending order of surface load value, and the components with the maximum surface load value of 80%～100% are regarded as the same unit.
The remaining components continue to be divided accordingly. It is allowed to test only the components with the largest surface load in each unit. When the test is qualified, the unit
Components with internal specifications can also be recognized as qualified.
8 Test method and judgment
8.1 General requirements
8.1.1 For components with current protection or disposable temperature protection device, the protection device should be removed or short-circuited.
8.1.2 Unless otherwise specified, components with multiple rated voltages or one (multiple) rated voltage ranges shall be within the specified range
The most unfavorable voltage is tested.
8.2 Overload fast on-off test
8.2.1 Put the components in the most severe product design conditions, according to the different rated surface loads of the components, load different rated loads according to Table 2.
For the test power of the power multiplier, a cycle of 0.4 s when the power is applied and 0.8 s when the power is disconnected is a cycle, and the continuous continuity test is performed. The component under test is not
Take cooling measures in addition to design requirements.
8.2.2 When necessary, the temperature controller or temperature control system should be installed to limit the operation of each part of the components not exceeding the limit specified in Appendix A
temperature. Once a component reaches the limit operating temperature, the test should be suspended immediately, and the test should be continued after waiting for the component to cool to room temperature naturally.
8.2.3 Qualification of the test is determined by the following two.
a) During the test, no phenomena that affect safety, such as melting, spraying fire, and releasing harmful gases, shall occur;
b) The sample after the test should not be damaged.
8.3 Leakage current measurement at operating temperature
After the relevant tests required by this standard, the components work under normal working conditions, and the test voltage should be adjusted to make the input power equal to
1.15 times the maximum rated input power. After reaching a steady state, measure the leakage current. For the measurement method, see 13.2 of GB 4706.1-2005.
The leakage current value should not exceed 3.5 mA.
Note. Before the test, the moisture in the components is allowed to be drained.
8.4 Electric strength test at working temperature
The test shall be carried out immediately after the test of 8.3 according to the provisions of 13.3 of GB 4706.1-2005, and shall be carried out within 5 s. The component should withstand the duration of 1
min, the voltage of the basic sine wave with a frequency of 50 Hz or 60 Hz, the test voltage is determined according to Table 3, the setting current of the electric strength test equipment
It is 5 mA.
The insulation of the component should be able to withstand the corresponding electric strength test, and there should be no breakdown during the test.
Note. The glow discharge that does not cause a voltage drop can be ignored.
AA
Appendix A
(Informative appendix)
Limit working temperature of commonly used materials for components
Refer to Table A.1 for the ultimate operating temperature of commonly used materials for components.
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