NB/T 10279-2019Warm-damp environmental conditions for power transmission and transformation equipments (English PDF)

4.1 General requirements

4.1.1 The actual use of power transmission and transformation equipment will be affected by a variety of environmental conditions. The conditions and codes included in it are climatic conditions (K), Special climatic conditions (Z), biological conditions (B), chemically active material conditions (C), mechanically active material conditions (S), mechanical conditions (M)

And electromagnetic conditions (E). For equipment in different places of use in different hot and humid areas, the above-mentioned various influential conditions and their strict Cool degree.

4.1.2 For some parameters in the standard, the severity cannot be specified quantitatively, but the severity is qualitatively specified for typical parameters, such as Condensation, icing and frost in climatic conditions, biological conditions, etc.

4.2 Climatic conditions

4.2.1 Climatic conditions grade parameters, see Table 1

Note: Zh. means heat radiation conditions; Za. means ambient air movement conditions; Zw. means other water source conditions except rain.

4.3 Biological conditions

The biological conditions in this standard only give typical parameters, and do not give quantitative severity values. See Table 3 for biological condition level parameters.

4.4 Conditions for chemically active substances

See Table 4 for the condition level of chemically active substances.

4.5 Mechanically active material conditions

The environmental parameters of mechanically active material conditions are shown in Table 5.

4.6 Mechanical conditions

Refer to Table 6 for the mechanical environmental condition parameter levels of vibration and swing, and refer to GB/T for specific spectrum types and response spectra. 4796-2017 and GB/T 14091-2009.

4.7 Electromagnetic conditions

See Table 7 and Table 8 for the electromagnetic environmental conditions and power supply conditions of the power transmission and transformation equipment. Sources of radiated pulse disturbances and Refer to GB/Z 18039.1-2002 for the range of harassment.

A.1 Description

This appendix provides necessary supplementary explanations on how to correctly select environmental parameters and their levels.

The climatic condition parameters in the standard refer to the short-term extreme conditions experienced by the transmission and transformation equipment in the service process.

The multi-year average of the extreme value, the chemical active substance condition adopts the maximum value, that is, the limit value or peak value that does not exceed 30 minutes per day.

A.2 Climatic conditions

3K4.This level is suitable for temperature controlled places with large humidity changes, and humidity control is not adopted. The product may encounter condensation and rain The impact of other water sources. But it is not affected by natural precipitation and freezing.

3K5, 3K5L. This grade is suitable for places where there is neither temperature control nor humidity control. Products can be exposed to solar radiation and heat radiation It is affected by sunlight, air flow, condensation, and water other than rain, and may encounter freezing, but is not affected by natural precipitation. 3K5L differs from 3K5 only in "high temperature" conditions.

4K3Hs. This level is suitable for products directly exposed to "damp heat" and "sub-humid heat" climate types without weather protection.

A.3 Biological conditions

3B1.This level is suitable for places where there is no biological hazard. The product is required to take protective measures, or the product is basically free of mold growth and Use in places destroyed by animals.

3B2, 4B1.These two levels are suitable for products exposed to mold growth and rodent damage, but no termites.

4B2.This level applies to places where the product is exposed to mold growth and rodents (including termites) damage.

4B3, 4B4.These two levels are applicable to places affected and damaged by marine organisms, and are determined according to the actual conditions in each sea area.

A.4 Chemically active substance conditions

3C1, 4C1.These two levels are suitable for places with less chemically active substances.

3C2, 4C2.These two levels are suitable for general pollution, low chemical gas concentration in the environment, but sometimes people can smell pungent odor Place.

3Cs1, 4Cs1.These two grades are suitable for areas far away from the ocean, and are basically free from salt spray pollution and corrosion.

3Cs2, 4Cs2.These two grades are suitable for products that are usually used alternately between salty atmosphere and dry atmosphere.

3Cs3, 4Cs3.These two levels are suitable for use in the marine environment or in offshore areas, which may be frequently exposed to the marine environment, but are usually sealed Closed object protection products.

3Cs4, 4Cs4.These two levels are suitable for products exposed to this environment during most of their service life in the marine environment or offshore areas. Product.

A.5 Mechanically active material conditions

3S1.This level is suitable for places where measures are taken to minimize floating dust and prevent sand from entering.

3S2.This level is suitable for places without dust-proof facilities, but the place is not close to sand and dust sources.

3S3.This level is suitable for places close to sand, dust or industrial dust sources or geographically located in places with windy sand or dust in the air.

4S1.This level is suitable for places not close to the source of sand.

4S2.This level is suitable for places with sand, dust or industrial dust sources.

4S3.This level is suitable for places with sand, dust or industrial dust sources or geographical locations with windy sand or dust in the air.

A.6 Mechanical conditions

M1.This level is suitable for places without significant vibration and impact, for example, away from places where there are moving or rotating machinery.

M2.This level is suitable for places with low significant vibrations, such as vibrations from nearby passing vehicles.

M3.This level is suitable for places with low significant impact, such as impacts from nearby passing vehicles or waves crashing.

M4.This level is suitable for places with significant vibration and impact, such as vibration and impact from nearby passing vehicles or relatively large waves Slap etc.

M5.This level is suitable for places with high impact, for example, the product is installed near moving or rotating machinery.

M6.This level is suitable for places with high vibration, for example, the product is installed near a moving or rotating machine with high vibration.

M7.This level is suitable for places with great vibration, for example, the product is directly installed on moving or rotating machinery.

M8.This level is suitable for places with extreme vibration, for example, the product is directly installed on a movable or rotating machine with high vibration.

A.7 Electromagnetic conditions

E1.This level is suitable for electromagnetic radiation environments with good protection measures or low energy levels.

E2.This level is suitable for electromagnetic environments with general protective measures or at a medium energy level.

E3.This level is suitable for electromagnetic radiation environment without protective measures or at high energy levels. E4.This level is suitable for extremely harsh electromagnetic environments.