Simply speaking, the dry transformer is the transformer of which the iron core and winding are not immersed in the insulating oil.
It can be divided into two types by structure: (1) winding enveloped with solid insulation (2) winding not enveloped It is used for the fireproof and explosion-proof occasion. For example: general building, subway and so on.
Model description:
Technical parameters:
1. Rated capacity: 100-2500kVA;
2. Rated voltage: primary voltage of 10kV and 6KV
Secondary voltage 0.4kV and others:
3. Rated frequency: 50Hz;
4. Number of phases: 3 phases;
5. Cooling mode: AN/AF;
6. Temperature resistance level of the insulation materials: Level H;
7. For technical performance data and insulation level, see Table 1 and 2.
Table 1 Performance parameters of dry transformer with primary rated voltage of 6kV, 10kV
Rated capacity (kVA) |
Voltage combination |
Connection unit symbol |
Loss |
Impedance voltage (%) |
No-load current (%) |
|||
Primary voltage kV |
Primary voltage tapping range % |
Secondary voltage kV |
No load W |
Load W |
||||
100 |
6 |
±5 |
0.4 |
Dyn11 |
405 |
1691 |
4 |
1.08 |
125 |
±2×2.5 |
Yyn0 |
477 |
1995 |
0.96 |
|||
160 |
|
|
549 |
2290 |
0.9 |
|||
200 |
|
|
630 |
2727 |
0.84 |
|||
250 |
|
|
729 |
2964 |
0.84 |
|||
315 |
|
|
891 |
3734 |
0.72 |
|||
400 |
|
|
990 |
4294 |
0.72 |
|||
500 |
|
|
1179 |
5254 |
0.72 |
|||
630 |
|
|
1359 |
6327 |
0.6 |
|||
630 |
|
|
1314 |
6413 |
6 |
0.6 |
||
800 |
|
|
1539 |
7486 |
0.6 |
|||
1000 |
|
|
1791 |
8750 |
0.6 |
|||
1250 |
|
|
2115 |
10431 |
0.6 |
|||
1600 |
|
|
2475 |
12607 |
0.6 |
|||
2000 |
|
|
3060 |
15552 |
0.48 |
|||
2500 |
|
|
3600 |
18487 |
0.48 |
Table 2 Insulation level
Rated voltage (kV) |
Rated short-term power frequency withstand voltage (kV) |
≤1 |
3 |
3 |
10 |
6 |
20 |
10 |
35 |
15 |
38 |
20 |
50 |
35 |
70 |
SGH10 series transformer is the insulation system with DuPont NOMEX paper as the main insulating medium. Best electrical performance can be maintained during whole service life of the transformer, and NOMEX paper is not easily aged and has shrinkage resistance, compression resistance and strong elastic force. Therefore, it can ensure that the coil can still maintain close structure and the capability to withstand short circuit after use of the transformer for years. It has high safety and overload capacity, free of flammability, toxic gas, supporting combustion. It is convenient for repair and maintenance, insensitive to humidity, dust and pollution, partial discharge is low, and there is no possibility in 'crack'. The coil adopts the pie type structure and vacuum impregnation process, so as to improve mechanical strength and insulation strength of the coil, and the bottom blowing structure of through-flow fan is adopted for the body, so as to improve heat emission efficiency. It is flexibly designed, and can be made of any specification required according to customer's requirements.
Capacity |
L × W × H (mm) |
Total weight (kg) |
100 |
1000×620×1080 |
430 |
200 |
1150×620×1145 |
890 |
315 |
1220×620×1280 |
1290 |
400 |
1260×620×1365 |
1530 |
500 |
1280×620×1435 |
1700 |
630 |
1360×700×1540 |
2190 |
800 |
1490×700×1390 |
2350 |
1000 |
1580×720×1480 |
2840 |
1250 |
1670×760×1555 |
3400 |
1600 |
1700×760×1690 |
3990 |
2000 |
1815×890×1690 |
4410 |
2500 |
1815×920×1820 |
5150 |
1. Oil-free, pollution-free, flame retardant and fireproof.
2. Low loss, high efficiency and low noise.
3. Small partial discharge capacity (generally below 10PC), high reliability. It can guarantee long-term safe operation, and the life can be up to 30 years.
4. It can resist crack and temperature change, and has high mechanical strength and strong resistance to short circuit capability.
5. The moisture-proof performance is good, it can be in normal operation at the humidity of 100%, and it can be put into operation without drying after stoppage.
6. The independent transformer chamber is not required, it is not required to lift the core for maintenance, and the load bearing beam is not required, which saves floor area for civil engineering; It is oil free, will not generate toxic gas, and will not pollute the environment. The oil sump and other auxiliary buildings are not required, and the construction cost of construction cost is reduced.
7. Installation is convenient without commissioning, and maintenance is almost not required; it is not required to replace and check oil seal, and the operation and maintenance cost is low.
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