ភស្តុតាងផ្ទុះ Shenhai
សីតុណ្ហភាពកំដៅអតិបរិមានៃសមាសធាតុដែលអាចទាក់ទងជាមួយល្បាយឧស្ម័ន-ខ្យល់ដែលអាចឆេះបាននៅក្នុងឧបករណ៍អគ្គិសនីដែលមានសុវត្ថិភាពកើនឡើង គឺជាកត្តាសំខាន់ក្នុងការកំណត់សុវត្ថិភាពដែលអាចការពារការផ្ទុះនៃឧបករណ៍អគ្គិសនី។. សមាសធាតុដែលផ្ទុកបច្ចុប្បន្ន, ជាពិសេសសមាសធាតុថាមពលដូចជា windings និងធាតុកំដៅ, ដើរតួជាប្រភពកំដៅនៅក្នុងឧបករណ៍អគ្គិសនី.
The maximum heating temperature should not exceed the limit temperature of increased safety electrical devices. The term ‘limit temperature’ refers to the highest permissible temperature of ឧបករណ៍អគ្គិសនីការពារការផ្ទុះ, which is the lower of the temperature determined by the equipment’s temperature class and the temperature at which the materials used achieve thermal stability. This limit temperature is the “កម្រិត” for ensuring the explosion-proof safety performance of សុវត្ថិភាពកើនឡើង electrical products. If the maximum heating temperature exceeds the limit temperature, it could ignite the corresponding ផ្ទុះ gas-air mixture or damage the mechanical and electrical properties of the materials used. ឧទាហរណ៍, for insulated windings, a sustained temperature beyond the stability temperature can halve its lifespan for every 8-10°C increase.
For insulated windings, their maximum heating temperature must not exceed the standard stipulated in the table.
Limit Temperature of Insulated Windings
| Characteristic Items | Temperature Measurement Method | Heat Resistance Level Of Insulation Materials | ||||
|---|---|---|---|---|---|---|
| - | - | A（105℃） | E（120℃） | B（130℃） | F（155℃） | H（180℃） |
| Maximum Temperature During Rated Operation/℃ | ||||||
| Single Layer Insulated Winding | Resistance Method Or Thermometer Method | 95 | 110 | 120 | 130 | 155 |
| Other Insulated Windings | Resistance Method | 90 | 105 | 110 | 130 | 155 |
| Other Insulated Windings | Thermometer Method | 80 | 95 | 100 | 115 | 135 |
| Extreme Temperature During Stall/℃ | ||||||
| Extreme Temperature At The End Of TE Time | Resistance Method | 160 | 175 | 185 | 210 | 235 |
For conductors carrying electrical current, at the maximum heating temperature, the material’s mechanical strength should not be reduced, there should be no deformation beyond what the permissible stress allows, and adjacent insulation materials should not be damaged. ឧទាហរណ៍, in the case of increased safety three-phase asynchronous motors, the rotor’s heating temperature will not harm the insulation of the stator windings.
In the design of បង្កើនសុវត្ថិភាពឧបករណ៍អគ្គិសនី, to prevent certain components’ temperatures from exceeding their limit temperature, designers should consider incorporating appropriate temperature protection devices, in addition to the electrical and thermal performance of the electrical components, to prevent overheating beyond their limit temperature.