GB/T 12665-2017 English PDF (GBT12665-2017)

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GB/T 12665-2017: Requirements of damp-heat testing of electrical machine for service in general environmental condition
GB/T 12665-2017
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.
a) for the electrical machine with rated voltage of 220V and above, determine
according to equation (1).
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. The entire
machine or component (only for large electrical machine) shall meet the
requirements of 3.2~3.5 after the damp-heat test specified in this sub-clause.
Method 1 (see Figure 1)
The temperature shall be reduced to 25°C±3°C within 3h~6h. At the
temperature drop rate in the initial 1.5h, it shall be as shown in Figure 1, the
temperature reaches 25°C ± 3°C within 3h ± 15min. The relative humidity in the
first 15 minutes shall not be less than 90%, and the relative humidity in other
time shall not be less than 95%.
Method 2 (see Figure 2)
The temperature shall be reduced to 25°C±3°C within 3h~6h. But there is no
additional requirement for the first 1.5h in Method 1. The relative humidity shall
not be less than 80%.
NOTE. The selection of Method 1 and Method 2 can refer to GB/T 2423.4-2008.
According to the situation of motor use, the product can also be subject
according to GB/T 2423.3-2006 to the constant damp-heat test. A constant
damp-heat test is conducted under the conditions of a test temperature of 40°C
± 2°C, a humidity of 90%~95%, and a duration of 48h.
voltage electrical machine or components can be removed from the test
chamber for testing, but shall be completed within 6h. If there is any doubt about
the insulation breakdown, it is permissible to retest immediately without
changing the test state. The test voltage is still in accordance with the provisions
of Clause 3.
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.
Whether the product is subjected to regular sampling test and its deadline are
regulated by various professional product standards.
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. If the test is qualified, the
products with the same structure, the same process, and the same material
(including the derived series and the same product with the same high range of
the center) are all qualified.
5.3 Number of test specimen
For the electrical machine for damp-heat test, the number of parts and
components shall follow the provisions.
- for the electrical machine with center height of 315mm and below, test 2
pieces each time;
- for the large electrical machine with center height above 315mm, test 1
piece each time;
- for large AC elect...