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Dry-type Transformer

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.
 
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Product Presentation


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).


Structural Features


● 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.


Technical performance parameters


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
(100℃)

F
(120℃)

H
(145℃)


B
(100℃)

F
(120℃)

H
(145℃)


B
(100℃)

F
(120℃)

H
(145℃)


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



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