GB/T 12665-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12665-2017 | English | 145 |
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Requirements of damp-heat testing of electrical machine for service in general environmental condition
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| GB/T 12665-2008 | English | 70 |
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Requirements of damp-heat testing of electrical machine for service in general environmental condition
| Obsolete |
| GB/T 12665-1990 | English | 279 |
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Requirements of damp-heat testing of electrical machine for service in general environmental condition
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GB/T 12665-2017: Requirements of damp-heat testing of electrical machine for service in general environmental condition
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12665-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
K 26
Replacing GB/T 12665-2008
Requirements of damp-heat testing of electrical machine
for service in general environmental condition
Issued on. NOVEMBER 1, 2017
Implemented on. MAY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Technical requirements... 4
4 Test method... 7
5 Inspection rules... 13
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 12665-2008 "Requirements of damp-heat testing
of electrical machine for service in general environmental condition". Compared
with GB/T 12665-2008, the main technical changes in this Standard are as
follows.
- updated Clause 2 Normative references;
- modified "voltage resistance" to "electrical strength" (see 3.3 of this
Edition);
- modified alternating humidity test method, added Method 2 (see 4.2 of
this Edition);
- added Figure 2;
- deleted moisture-proof humidifier, added NOTE 1 (see 4.3 of Edition
2008);
- added test method for leakage current after damp-heat (see 4.4 of this
Edition).
This Standard was proposed by China Electrical Appliance Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee
on Rotary Motor of Standardization Administration of China (SAC/TC 26).
The drafting organizations of this Standard. China Electric Apparatus Research
Institute Co., Ltd., Zhejiang Lianyi Motor Co., Ltd., Hangzhou Weiguang
Electronics Co., Ltd., Anhui University, Weikai Detection Technology Co., Ltd.,
Hangzhou Fusheng Electric Appliance Co., Ltd., Guangdong Welling Motor
Manufacturing Co., Ltd., Zhejiang Jiuke Electric Co., Ltd., Xiamen Fran
Appliances Technology Co., Ltd., Xi'an Xumai Intelligent Household Appliance
Technology Co., Ltd., Wenzhou Anghua New Energy Co., Ltd.
Main drafters of this Standard. Zheng Ziying, Huang Haiyan, Li Guoli, He Ping,
Liu Mingtao, Zhang Yunchang, Zhang Bing, Wang Jianchi, Long Xinhua, Chen
Feng, Bao Yikai.
Versions of standard substituted by this Standard are.
- GB/T 12665-1990, GB/T 12665-2008.
Requirements of damp-heat testing of electrical machine
for service in general environmental condition
1 Scope
This Standard specifies the damp-heat test method, technical requirements and
inspection rules of rotary electrical machine in general environmental condition.
This Standard applies to all types of rotary electrical machines (except micro-
control electrical machine, hereinafter referred to as the electrical machine).
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 755, Rotating electrical machines - Rating and performance
GB/T 2423.3-2006, Environmental testing for electric and electronic products
- Part 2.Testing method test Cab. Damp heat Steady state
GB/T 2423.4-2008, Environmental testing for electric and electronic products
- Part 2.Test method - Test Db. Damp heat, cyclic (12h+12h cycle)
GB/T 12113-2003, Methods of measurement of touch current and protective
conductor current
3 Technical requirements
3.1 Insulation resistance
3.1.1 The insulation resistance value between the windings of the whole
machine to the casing and the winding shall not be lower than the following
values.
3.1.2 When a large-scale motor component is used for the damp-heat test,
the insulation resistance converted to the complete machine is determined
according to equation (2).
3.4 Running performance
The electrical machine shall be able to operate normally. No sticking or other
effects on the normal operation of the motor shall occur. The performance shall
meet the requirements of relevant product standards.
4 Test method
4.1 Preparation before test
4.1.1 Test equipment and instruments
The damp-heat test chamber shall meet the requirements of Clause 4 of GB/T
2423.4-2008.
4.1.2 Test specimen requirements
When the large-scale electrical machine tests components, aluminum foil is
used for the measuring electrode of the high-voltage stator winding and the DC
electrical machine compensation winding. For slotted insulation and
impregnated coils, a simulation slot shall be made.
4.1.3 Pre-treatment of test specimen
Before the damp-heat test, the test specimen shall be placed in a hot and humid
test chamber for preheating. The preheating temperature is 25°C ~ 35°C. From
the time when the temperature of the damp-heat test chamber reaches 25°C,
the time is not less than 8h.
4.2 Damp-heat test method
According to GB/T 2423.4-2008, perform the alternating damp-heat test. High
temperature is generally 40°C. According to the severity of the use of occasions,
it can choose 55°C. There are two ways to reduce the temperature (see Figure
1 and Figure 2). Choose one of them to test. The conditions for each test cycle
are shown in Figure 1 and Figure 2.Carry out 6 cycles in total.
4.3 Measurement of insulation resistance
When carrying out the alternating test, the low temperature and high humidity
stage of the last week of the damp-heat test shall be maintained at a
temperature of 25°C ± 3°C and a relative humidity of 95% ~ 98%.
4.4 Measurement of leakage current
After subjected to the damp-heat test, the leakage current of the electrical
machine shall be measured by using the circuit device described in Figure 4 of
GB/T 12113-2003.
4.6 Running performance check
The check of running performance of the electrical machine shall be completed
within 48h after the test specimen is removed from the chamber. The check of
running performance shall be carried out in the way of power running. The
performance requirements of electrical machine are specified by various
professional product standards.
5 Inspection rules
5.1 General
The damp-heat test shall be carried out when the product design stereotype or
design, process and material used changes affect the damp-heat resistance of
the product.
5.2 Sampling method of sample
The damp-heat test of the electrical machine allows a representative product to
be sampled by a random sampling method in a series of products of the same
structure, the same process, and the same material.
5.3 Number of test specimen
5.4 Determination of test results
After the damp-heat test of the electrical machine, if it can meet the
requirements of Clause 4, the test results shall be qualified.
For the damp-heat test of small and micro electrical machines, if one test result
is not qualified, it is allowed to double the number of products for retest. If there
is another failure, it is not allowed to leave the factory. For medium and large
electrical machines, when the test results are unqualified, it is allowed to retest
after effectively eliminating product defects.
5.5 Processing for the unqualified
Any electrical machine or component that fails the damp-heat test results is
allowed to leave the factory after it has been rectified.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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