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南京1500KVA 13.8 0.38KV Mine Dry-Type Transformer
产品描述
Overview:
Dry-type transformers are widely used in local lighting, high-rise buildings, airports, wharf CNC machinery and equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). In natural air cooling, the transformer can operate continuously for a long time under the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency accident overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, so it should not be kept in continuous overload operation for a long time.
Structure type
It is mainly composed of an iron core composed of silicon steel sheets and a coil made of epoxy resin. An insulating tube is placed between the high and low voltage coils to increase electrical insulation, and the line is supported and constrained by spacers.
The fasteners that overlap the ring and its parts all have anti-loosening performance.
Construction performance:
(1) Solid insulation encapsulated winding
(2) Unencapsulated winding
Winding: Of the two windings, the higher voltage is the high-voltage winding, and the lower one is the low-voltage winding.
From the relative position of the high and low voltage windings, high voltage can be divided into concentric and overlapping types.
Concentric windings are simple and convenient to manufacture, so this structure is adopted.
Overlap type, mainly used for special transformers.
Structural characteristics of dry-type transformers
Because dry-type transformers have the advantages of strong short-circuit resistance, small maintenance workload, high operating efficiency, small size, and low noise, they are often used in places with high performance requirements such as fire prevention and explosion protection.
1. It is safe, fireproof, pollution-free, and can be directly operated in the load center;
2. Adopting domestic advanced technology, high mechanical strength, strong short-circuit resistance, small partial discharge, good thermal stability, high reliability and long service life;
3. Low loss, low noise, obvious energy saving effect, rabbit maintenance;
4. Good heat dissipation performance, strong overload capacity, and capacity operation can be increased when forced air cooling;
5. Good moisture-proof performance, adapt to high humidity and other harsh environments;
6. Dry-type transformers can be equipped with a complete temperature detection and protection system. Using intelligent signal temperature control system, it can automatically detect and circulate display the respective operating temperatures of the three-phase windings, can automatically start and stop the fan, and have functions such as alarms and trips;
7. Small size, light weight, less space and low installation cost.
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1 Parameter |
Model |
S-1500 /13.8 |
Serial Nos. |
2021 |
2001 |
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Capacity |
150 kVA |
Rated Frequency |
50 Hz |
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Rate V |
13800 / 230 V |
Rated Current |
6.28/376.5A |
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Insul. Class |
LI 95 AC 35/AC5 |
Connection mode |
Dyn11 |
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Insul. Oil |
25 Transformer purposed oil |
Conditions |
Outdoor |
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Phase |
3 |
Cooling way |
ONAN |
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Codes of P. |
1TY.710.5277 |
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2 Earth V. |
Tapping stage |
High Voltage V |
Other Tapping V |
Lower V |
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5 |
13800 |
13800±2×2.5 % |
230 |
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3 Insulation performance |
Resistance |
Once to ground |
Secondary to ground |
Time of the secondary and ground |
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МΩ |
2500 |
2500 |
2500 |
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4 Voltage ratio &connection group label verification |
High voltage winding HV |
Low winding LV |
Measurement deviation % |
Connection group |
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Tapping stage |
Voltage kV |
Voltage kV |
AB/ab |
BC/bc |
CA/ca |
Verification |
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|
1 |
14.49 |
0.23 |
0.08 |
0.02 |
0.05 |
Dyn11 |
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|
2 |
14.145 |
0.08 |
0.05 |
0.04 |
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3 |
13.8 |
0.06 |
0.03 |
0.02 |
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4 |
13.455 |
0.06 |
0.06 |
0.01 |
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5 |
13.11 |
0.07 |
0.09 |
0.07 |
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5 Wire-wound resistor |
Winding Group |
Position |
Real test values |
Max. Unbalance Rate % |
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AB (Ω) |
BC (Ω) |
CA (Ω) |
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High Voltage HV |
1 |
12.94 |
12.98 |
12.96 |
0.33 |
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2 |
12.63 |
12.67 |
12.65 |
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3 |
12.32 |
12.36 |
12.34 |
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4 |
12.01 |
12.05 |
12.03 |
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5 |
11.71 |
11.74 |
11.72 |
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Low Voltage LV |
Line resistance |
ab (mΩ) |
bc (mΩ) |
ca (mΩ) |
1.13 |
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6.094 |
6.101 |
6.163 |
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Phase resistance |
oa (mΩ) |
ob (mΩ) |
oc (mΩ) |
2.12 |
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|
3.047 |
3.053 |
3.112 |
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6 Applied voltage withstand test. |
Pressurized area |
Voltage Testing kV |
Test time S |
Conclusion |
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High voltage to ground, low voltage |
35 |
60 |
PASS | ||||
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Low voltage to ground, high voltage |
5 |
60 |
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7 Induced Overvoltage Withstand Test |
Applied voltage kV |
Induced voltage kV |
Induction |
Frequency |
Test time |
Conclusion |
|
|
LV |
HV |
Multiple |
Hz |
S |
PASS |
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|
0.46 |
27.6 |
2 |
150 |
40 |
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8 No load loss and no load current test |
Averaged voltage |
Effective voltage |
No-load Current % |
No-load Loss kW |
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kV |
kV |
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0.23 |
0.23 |
0.66 |
0.245 |
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9 Short circuit impedance and load loss measurement |
Winding Group |
Tapping place |
Applied Current A |
Short circuit impedance % |
No-load Loss kW |
Total Loss kW |
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|
HV-LV |
3 |
6.28 |
4.02 |
1.915 |
2.16 |
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10 Transformer oil test |
Density ≤ 0.895㎏/dm³ |
Kinematical Viscosity 50°C≤11.6 |
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Flash Point ≥140°C |
Insulating Oil Dielectric Loss ≤0.005 |
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Acid Value ≤0.01mgKOH/g |
Ash - % |
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Withstand voltage 45KV/2.5mm |
Oil number Domestic 25# type |
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11 Sealing test |
The product can endure 20 Kpa pressure for 12 hours without leakage. |
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Conclusion |
This type of power transformer has passed the test and its performance meets with the National Standards GB/T 1094.1 ~ 2-2013, GB/T 1094.3-2003, GB/T 1094.5-2008 and the technical parameters and GB/T 6451-2015 requirements. It has been checked up to the production standards and its final quality okeyed for sales, be qualified for delivery in conformity with Standards. |
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