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Dry Type transformer
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  • Dry Type transformerDry Type transformer
  • Dry Type transformerDry Type transformer
  • Dry Type transformerDry Type transformer
  • Dry Type transformerDry Type transformer
  • Dry Type transformerDry Type transformer

Dry Type transformer

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Product Description

Dry Type transformer Details            

Dry-type transformers manufacture by DAHU ELECTRIC are widely used in various applications due to their excellent insulation properties, high efficiency, and environmental friendliness. Here are some of the common application scenarios for resin-insulated dry-type transformers:

Commercial buildings: These transformers are commonly used in commercial buildings, such as office buildings, shopping malls, and hotels, to provide reliable and efficient power distribution.

Industrial facilities: Dry-type transformers are also widely used in industrial facilities, such as factories and warehouses, to power heavy machinery and equipment.

Renewable energy systems: These transformers are an essential component of renewable energy systems, such as wind and solar power plants, where they help to convert and distribute the electrical energy generated by these systems.

Data centers: Dry-type transformers are commonly used in data centers to provide reliable and efficient power distribution to the servers and other equipment.

Hospitals: These transformers are also used in hospitals to power critical medical equipment and ensure uninterrupted power supply.

Marine and offshore applications: Dry-type transformers are suitable for use in marine and offshore applications, where they can withstand harsh environmental conditions and provide reliable power distribution.

Overall, dry-type transformers are versatile and can be used in various applications where reliable and efficient power distribution is required. Their environmental friendliness and low maintenance requirements make them an attractive option for many industries.

Product Introduction

Insulation Material:

The dry type transformer is insulated with high-quality epoxy resin, which provides excellent electrical insulation and thermal stability. The resin insulation ensures the safety and reliability of the transformer, even in harsh operating conditions.

Core Material:

The core of the dry type transformer is made of high-grade, low-loss silicon steel laminations. These laminations are carefully stacked to minimize core losses and improve the overall efficiency of the transformer.


The windings are made of high-quality copper or aluminum conductors, depending on the specific requirements of the application. The windings are carefully designed and wound to ensure optimal performance and minimal losses.


The dry type transformer is housed in a robust and corrosion-resistant enclosure made of high-quality steel. The enclosure provides protection against environmental factors such as dust, moisture, and mechanical stress.

Cooling System:

Dry type transformers are designed with an efficient cooling system to dissipate heat generated during operation. The cooling system may include natural convection, forced air, or a combination of both, depending on the transformer rating and application.

Voltage and Power Ratings:

The dry type transformers are available in various voltage and power ratings to meet different application requirements. The voltage ratings typically range from 1 kV to 36 kV, and the power ratings range from a few kVA to several MVA.

Noise Level:

Dry type transformers are designed to operate with low noise levels, making them suitable for installation in noise-sensitive areas such as residential neighborhoods, hospitals, and schools.

Environmental Friendliness:

These transformers are environmentally friendly as they do not contain any oil or hazardous substances. They are free from the risk of oil leakage, making them safe for both the environment and personnel.


Dry type transformers offer numerous advantages, including excellent insulation properties, high efficiency, and environmental friendliness. With their robust construction and reliable performance, these transformers are suitable for a wide range of applications in industries such as power generation, distribution, and industrial processes.

Technical data

The transformers shall fulfil the following:

Nr Description Requirement
1 Dry-type transformer type Cast Resin (Cast Coil)
2 Site altitude <1000m
3 Operation Continuous
4 Installation Indoors
5 Ambient temperature (max /daily / annual average)[℃] 40/30/20
6 Tier type (EU 548/2014) 2
7 Rated power 2000 kVA
8 Cooling AN
9 Rated frequency 50 HZ
10 Nominal primary voltage 11 kV
11 Nominal secondary voltage 0.4kV
12 Insulation level HV (Um/AC /LI) 12 KV/28 kV/75 kV
13 Insulation level LV (Um/ AC) 1.1kV/3kV
14 Off-load tapping (HV) ±2x2.5%
15 Vector group Dyn 11
16 Insulation class (HV /LV) F/F
17 HV terminal (lower terminals) Direct cable
18 LV terminals Top entry,flex

connection to bus bar
19 Climatic classification C2
20 Environmental classification E2
21 Fire behaviour classification F1
22 Impedance voltage (Uk) [%] 6%
23 No load losses (Po)[W] 3600
24 Load losses at 75℃ (Pk) [M] 18000
25 Load losses at 120℃ (Px) [W] 18000
26 Maximum acoustic power Lw(A) 70 dB
27 Ground acceleration level withstand capability (horiz./vert.) [g] ≥0.2/≥0.2
28 Length [mm] 1750
29 Width [mm] 1250
30 Height[mm] 2100
31 Total weight [kg] 3700
32 Transformer centre distance of wheels [mm] 1070
33 Ingress Protection (IP) IP00

1.8 Fitting and Accessories

Each transformer shall be provided with:

Nr Requirement
34 Applicable fasteners 1 set
35 Earthing balls on HV terminals (upper terminals) 1 set
36 Grounding terminals near the bottom 2
37 Finishing of transformer Standard
38 PTC temperature sensors located inside the LV windings 3 sets
38.1 Trip signal activates at: 150
38.2 Alarm signal activates at 120
38.3 Fan control activates at 80
39 PT100 temperature sensor fixed on outside of transformer 1
40 Terminal box mounted on trans former 1
41 Thermal protection unit (see section 09) 1
42 Earthquake fastenings 1 set
43 Rating plate mounted on transformer 1
44 Extra rating plate (loose delivery) 1
45 Lifting eyes and pulling holes Standard
46 Housing No

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