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With the development of modern cities, power distribution room especially in high-rise buildings and high fire rating buildings has put forward the requirements of fire prevention and explosion protection according to the relevant fire safety regulations. Dry type transformers then was widely used in high-rise buildings, underground facilities, densely populated areas and humid environments due to its own advantages, such as fire prevention, explosion protection, no pollution, maintenance-free. Therefore , the proportion of dry change is getting higher and higher in the urban power distribution system recent years.
This series of products implement the national standards GB1094 《Power transformer》, GB/T10228 《Dry power transformer technical parameters and requirements》 and GB20052 《Power transformer energy efficiency limit value and energy efficiency grade》.
At present, this series of products is mainly divided into three levels according to energy efficiency levels, namely SCB18 Level I energy efficiency (NX1), SCB14 Level II energy efficiency (NX2), SCB12 Level III energy efficiency (NX3).
● HV and LV coils of dry type transformer are cast structure, which has many advantages such as strong anti-short circuit ability, small maintenance workload, high operating efficiency, small volume and low noise. The dry type transformer is often used in places with higher requirements of fire protection, explosion proof .
● Coil casting using static mixing, vacuum casting, positive pressure process, so the performance is better than vacuum casting without positive pressure process.
● Taking simulation analysis of the core model to avoid core cavity resonance and effectively reduce the noise; Taking lightning shock simulation analysis of the high-voltage coil model to improve the anti-lightning shock ability of the product. Reducing interlayer field strength and intersegment field strength to get low partial discharge.
● HV and LV casting coil has thin resin structure, non-cracking, good heat dissipation performance, and low temperature rise.
● HV and LV casting coil are made of H class insulation materials, which has strong overload capacity, and can run for a long time under 110% load in self-cooling mode and run for a long time under 150% load in forced air cooling mode.
● It can be equipped with a complete temperature detection and protection system. The intelligent signal temperature control system can automatically detect and display the respective working temperature of the three-phase winding, and can automatically start and stop the fan, and has alarming , tripping and other functions.
● Good looking, small size, small footprint, low installation cost.
10kV dry type three-phase double-winding unexcited voltage regulation distribution transformer energy efficiency class | |||||||||||||
Rating capacity | NX1 | NX2 | NX3 | impedance | |||||||||
Silicon steel | Silicon steel | Silicon steel | |||||||||||
No load loss | W load loss | No load loss | load loss | No load loss | load loss | ||||||||
B | F | H | B | F | H | B | F | H | |||||
30 | 105 | 605 | 640 | 685 | 130 | 605 | 640 | 686 | 150 | 670 | 710 | 760 | 4 |
50 | 155 | 845 | 900 | 965 | 185 | 845 | 900 | 965 | 215 | 940 | 1000 | 1070 | |
80 | 210 | 1160 | 1240 | 1330 | 250 | 1160 | 1240 | 1330 | 295 | 1290 | 1380 | 1480 | |
100 | 230 | 1330 | 1415 | 1520 | 270 | 1330 | 1415 | 1520 | 320 | 1480 | 1570 | 1690 | |
125 | 270 | 1565 | 1665 | 1780 | 320 | 15655 | 1665 | 1780 | 375 | 1740 | 1850 | 1980 | |
160 | 310 | 1800 | 1915 | 2050 | 365 | 1800 | 1915 | 2050 | 430 | 2000 | 2130 | 2280 | |
200 | 360 | 2135 | 2275 | 2440 | 420 | 2135 | 2275 | 2440 | 495 | 2370 | 2530 | 2710 | |
250 | 415 | 2330 | 2485 | 2665 | 490 | 2330 | 2485 | 2665 | 575 | 2590 | 2760 | 2960 | |
315 | 510 | 2945 | 3125 | 3355 | 600 | 2945 | 3125 | 3355 | 705 | 3270 | 3470 | 3730 | |
400 | 570 | 3375 | 3590 | 3850 | 665 | 3375 | 3590 | 3850 | 785 | 3750 | 3990 | 4280 | |
500 | 670 | 4130 | 4390 | 4705 | 790 | 4130 | 4390 | 4705 | 930 | 4590 | 4880 | 5230 | |
630 | 775 | 4975 | 5290 | 5660 | 910 | 4975 | 5290 | 5660 | 1070 | 5530 | 5880 | 6290 | |
630 | 750 | 5050 | 5365 | 5760 | 885 | 5050 | 5365 | 5760 | 1040 | 5610 | 5960 | 6400 | 6 |
800 | 875 | 5895 | 6265 | 6715 | 1035 | 5895 | 6265 | 6715 | 1215 | 6550 | 6960 | 7460 | |
1000 | 1020 | 6885 | 7315 | 7885 | 1205 | 6885 | 7315 | 7885 | 1415 | 7650 | 8130 | 8760 | |
1250 | 1205 | 8190 | 8720 | 9335 | 1420 | 8190 | 8720 | 9335 | 1670 | 9100 | 9690 | 10370 | |
1600 | 1415 | 9945 | 10555 | 11320 | 1665 | 9945 | 10555 | 11320 | 1960 | 11050 | 11730 | 12580 | |
2000 | 1760 | 12240 | 13005 | 14005 | 2075 | 12240 | 13005 | 14005 | 2440 | 13600 | 14450 | 15560 | |
2500 | 2080 | 14535 | 15445 | 16605 | 2450 | 14535 | 15445 | 16605 | 2880 | 16150 | 17170 | 18450 |