Environmental technical requirements of rotating electric machines for tropical use
1 Scope
This standard specifies the protection types, environmental conditions, technical requirements, test methods, inspection rules and marking of electric machines.
This standard is applicable to rotating electric machines for tropical stationary use.
The rotating electric machines for tropical use (including large-sized, medium-sized and small-sized electric machines as well as small-power electric machines, hereinafter referred to as electric machines) shall meet the requirements of this standard. Those not specified and described in this standard shall meet those specified in GB 755-2000, GB/T 5171-2002 and the special technical specifications for the corresponding products.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB 755-2000 Rotating electrical machines - Rating and performance (idt IEC 60034-1: 1996)
GB/T 2423.4-1993 Basic environmental testing procedures for electric and electronic products－Test Db: Damp heat, cyclic (eqv IEC 60068-2-78: 1985)
GB/T 2423.16-1999 Environmental testing for electric and electronic products - Part 2: Test methods - Test J and guidance: Mould growth (eqv IEC 60068-2-10: 1988)
GB/T 2423.17-1993 Basic environmental testing procedures for electric and electronic products - Test Ka: Salt mist (eqv IEC 60068-2-11: 1981)
GB/T 4798.3-2007 Environmental conditions existing in the application of electric and electronic products - Part 3: Stationary use at weather-protected locations (IEC 60721-3-3: 2002, MOD)
GB/T 4798.4-2007 Environmental conditions existing in the application of electric and electronic products - Part 4: Stationary use at non-weather-protected locations (IEC 60721-3-4: 1995, MOD)
GB/T 4942.1-2006 Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification (IEC 60034-5: 2000, IDT)
GB/T 5171-2002 General technical requirements for small power motors
GB/T 9286-1998 Paints and varnishes - Cross cut test for films (eqv ISO 2409: 1992)
GB/T 13384-1992 General specifications for packing of mechanical and electrical product
GB/T 16422.1-2006 Plastics - Methods of the exposure to laboratory light sources - Part 1: General guidance (ISO 4892-1: 1999, IDT)
JB/T 4159-1999 General technical requirements for electric products in the tropics
3 Weather protection types and environmental conditions of electric machines
3.1 Weather protection types
The weather protection types of electric machines are classified as follows:
a) weather-protected locations (TH) and non-weather-protected locations (THW) for electric machines used in humid tropics;
b) weather-protected locations (TA) and non-weather-protected locations (TAW) for electric machines used in arid tropics;
c) weather-protected locations (T) and non-weather-protected locations (TW) for electric machines used in tropics.
3.2 Environmental conditions
The environmental conditions are classified into the following six categories: climatic conditions (K), special climatic conditions (Zh - heat radiation, Za - ambient air velocity, Zw - water source except rain), biological conditions (B), chemically active substance conditions (C), mechanically active substance conditions (S) and mechanical conditions (M).
According to the protection situation, the location of electric machines is divided into:
a) Weather-protected locations - indoors or locations with better concealment (its building construction is such that the impact of change in outdoor daily climate, including that under shed, can be prevented or reduced).
b) Non-weather-protected locations - locations that are completely open or only sheltered simply, which can almost not prevent the impact of change in outdoor daily climate. The parameters of the environmental condition grade of electric machines used in humid tropics, arid tropics or tropics in different locations are as follows:
Foreword i
1 Scope
2 Normative references
3 Weather protection types and environmental conditions of electric machines
4 Technical requirements
5 Test method
6 Inspection rules
7 Marking, packaging and storage
