I.11kv Oil immersed Transformer overview
Against the backdrop of global electricity demand growth, 11kV three-phase oil immersed transformers are widely used in rural power grids, industry, commerce, new energy, public facilities, and other fields. High reliability operational verification in over 50 countries and regions worldwide; Already sold to countries and regions such as Tanzania, Zimbabwe, Ghana, South Africa, Kenya, Zambia, Sudan, Libya, Congo, United Arab Emirates, Saudi Arabia, Iraq, Syria, Bangladesh, etc
II.11kv Oil immersed Transformer Advantage
1. Standards: GB, IEC, GOST, EN, NF, ANSI/IEEE (customizable according to customer standards)
2. Certification: ISO、CE、IEC、SABS、COC、CSA、UL
3. Efficiency: The efficiency of an 11kV three-phase oil immersed transformer can exceed 99%, which can meet the European 2015/2014/548/EC ecodesign Tier 2 energy efficiency regulations.
4. Maintenance free: IP65 protection level, dustproof and moisture-proof, maintenance free, designed for a lifespan of over 25 years.
5. Environmental protection and sustainable development: FR3 vegetable oil can be selected.
6. Overload capacity: Copper coil 11kv transformer allows short-term overload to 150% of rated capacity for no more than 2 hours, but requires monitoring of oil temperature (≤ 95 ℃).
III.11kv Oil immersed Transformer Type
For HENGFENGYOU ELECTRIC, a 11kv transformer can be a three-phase oil immersed transformer, a column mounted three-phase oil immersed transformer, or a three-phase pad mounted transformer. These types of transformers have the same principle, but their structures are different, and different types of transformers have different applications. HENGFENGYOU ELECTRIC provides you with the most ideal solution.
11kV three-phase oil immersed transformer (rated voltage 6kV-35kV)
Install a three-phase oil immersed transformer (rated voltage 2.4kv-34.5kv) on an 11kV column
11kV three-phase pad mounted transformer (rated voltage 2.4kv-34.5kv)
IV.11kv Oil immersed Transformer Technical Specifications
- Input voltage: 11kV
- Output voltage: 0.4kV 0.415 kv 0.420kv 0.430kv 0.440kv
- Capacity: 25-2500 kva（Up to 10MVA）
- Frequency: 50/60 HZ
- Remark: voltage, capacity, frequency, connection group and loss can be customized according to customer requirements
|
额定容量Capacity
|
额定电压及分接范围Rated voltage&Off-load tapping |
联结组标号
Vector
GroupSymbol |
空载损耗
NO-load
loss（W） |
负载损耗
Load loss（W） |
空载电流
NO-load current（%） |
短路阻抗Short
circuit impedance(%) |
高压
H.V(kv) |
高压分接范围
High pressure
Tap range（%） |
低压
L.V(kv) |
|
30 kva |
11 10.5
10 6.3
6 |
±5%
±2x2.5% |
0.4
0.415
0.420
0.430
0.440 |
Dyn11
Yyn0 |
100 |
630/600 |
1.5 |
4 |
|
50 kva |
130 |
910/870 |
1.3 |
4 |
|
60 kva |
150 |
1090/1040 |
1.2 |
4 |
|
75 kva |
180 |
1310/1250 |
1.2 |
4 |
|
100 kva |
200 |
1580/1500 |
1.1 |
4 |
|
125 kva |
240 |
1890/1800 |
1.1 |
4 |
|
150 kva |
280 |
2310/2200 |
1 |
4 |
|
200 kva |
340 |
2730/2600 |
1 |
4 |
|
250 kva |
400 |
3200/3050 |
0.9 |
4 |
|
300 kva |
480 |
3830/3650 |
0.9 |
4 |
|
400 kva |
570 |
4520/4300 |
0.8 |
4 |
|
500 kva |
680 |
5410/5150 |
0.8 |
4 |
|
600 kva |
810 |
6200 |
0.6 |
4.5 |
|
750 kva |
980 |
7500 |
0.6 |
4.5 |
|
1000 kva |
1150 |
10300 |
0.6 |
4.5 |
|
1250 kva |
1360 |
12000 |
0.5 |
4.5 |
|
1500 kva |
1640 |
14500 |
0.5 |
4.5 |
|
2000 kva |
1940 |
18300 |
0.4 |
5 |
|
2500 kva |
2290 |
21200 |
0.4 |
5
|
V.11kv Oil immersed Transformer Case show
Grow business with Hengfengyou
Our goal is to become the world's leading manufacturer of electrical equipment. The business, experience and technology accumulated over the years have benefited customers in more than 50 countries around the world. Once our customers establish a cooperative relationship, they are long-term trusted customers, because Hengfengyou always insists on providing you with our best electrical products and services.
VI.11kv Oil immersed Transformer FAQ
What is an 11kV three-phase oil immersed transformer?
A three-phase oil immersed transformer is a power transformer that is cooled and insulated by insulating oil. It is designed for use in three-phase AC power systems and can convert high voltage electrical energy into low voltage (such as 11kV/400V). It is widely used in industrial, commercial, and power grid distribution.
What are the typical application scenarios for Q2?
*Voltage conversion of urban distribution network (11kV → 400V);
*Power distribution in industrial plants such as mines and petrochemicals;
*Grid connection of renewable energy power plants (such as wind farms);
*Hospitals, data centers, and other places that require high reliability power supply.
What is the rated capacity range of Q3?
The common capacity ranges from 25kVA to 10MVA, with the 100kVA to 2000kVA models of 11kV/400V being the most widely used, depending on the load requirements.
What is the difference in maintenance cycle between Q4 11kV dry-type and oil immersed transformers?
Dry type: Dust removal inspection every 2-3 years; Oil immersed: Check the oil level, oil quality (pressure resistance value, acidity), sealing, and radiator cleaning once a year; Comprehensive oil sample testing every 3-5 years (such as medium loss and moisture content).
How to choose between Q5 three-phase oil immersed transformer and dry-type transformer?
-11kV oil immersed transformers are suitable for outdoor, high-capacity, and high load scenarios, with low cost but requiring regular maintenance;
-11kV dry-type transformer: used in indoor environments with high fire protection requirements (such as shopping malls and subways), maintenance free but expensive.
How to determine whether a transformer needs to change oil or filter oil?
-Oil quality testing: Regularly test the breakdown voltage (should be ≥ 30kV), water content (≤ 20ppm), and acid value of the oil;
-Cloudy oil color: The oil becomes darker or there is an increase in suspended matter;
-Decreased insulation performance: determined by withstand voltage test.
-Long term overload;
-Cooling system malfunction (fan/oil pump shutdown);
-Oil circuit blockage or insufficient oil volume;
-Internal short circuit or poor contact.
How to deal with oil leakage in oil immersed transformers?
-Slight oil leakage: tighten bolts or replace gaskets;
-Serious oil leakage: Stop immediately, drain the oil and repair or replace components;
What protective devices must be configured for Q9?
*High voltage side: circuit breaker or fuse (with overcurrent/short-circuit protection);
*Body protection: gas relay, pressure relief valve, oil temperature gauge;
*System protection: lightning arrester (anti lightning impulse)
*Monitoring device: oil level gauge, online oil chromatography analyzer (high-end configuration).
What are the key points to pay attention to when installing Q10?
-Stable foundation, horizontal installation, avoiding tilting;
-Reserve sufficient heat dissipation space (such as at least 1.5 meters away from the wall);
-Grounding resistance ≤ 4 Ω;
-Check the oil level, sealing, and cleanliness of the casing.
