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DKSC Series Dry Type Grounding Transformer

Overview

DKSC series dry grounding transformer is designed for neutral-insulated three-phase systems. It uses ZN zigzag wiring to draw out the neutral point (directly grounded or via resistor/arc suppression coils) and has voltage conversion + grounding fault protection functions. Epoxy resin vacuum casting ensures high insulation, with oil-free fire resistance, maintenance-free operation and high reliability. Suitable for 6-35kV substations, industrial plants and rail transit; complies with IEC, CE, UL standards.

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Brief Introduction

Ⅰ.Brief Intrucodtion

1.Customizable: Support voltage level (6kV/10kV/35kV, etc.), capacity (50-3150kVA), grounding method (direct/through arc suppression coil, etc.), protection level (IP20/IP54/IP65), cooling method (natural air cooling/forced air cooling) and insulation level (F/H class) customization.

2.Executive standards: Comply with IEC 60076, IEC 60289 international standards, and pass CE (EU), UL (North America), CQC (China) and other certifications.

3.Voltage level: regular 6kV, 10kV, 35kV, can be customized for 11kV, 20kV and other regional special voltages.

4.Voltage regulation mode: standard non-excitation voltage regulation (power-off adjustment), optional on-load voltage regulation (non-interruption voltage regulation, adapt to voltage fluctuations).

5.High Voltage Tap Range: Conventional ±5% (5 stops), expandable to ±10% (9 levels), adapting to grid voltage deviations.

6.Rated capacity: 50kVA~10000kVA, matching the voltage level and load demand.

7.Frequency: 50Hz (mainstream market) / 60Hz (North America and other regions), customized on demand.

8.Phase number: three-phase, suitable for the world’s mainstream three-phase power system.

9.Connection group: Dyn11, YNd11 as standard, ZN wiring for grounding (low zero-sequence impedance, fast response).

10.Impedance voltage: 4%-8% adjustable, balancing short-circuit current limiting and voltage regulation requirements.

11.Cooling methods: natural air cooling (AN, for low loads), forced air cooling (AF, high load / high temperature environments).

12.Protection level: IP20 (indoor dustproof), IP54 (outdoor dust and splash), IP65 (fully sealed against rainstorm).

13.Insulation Grade: Class F (155°C, Conventional Environment), Class H (180°C, High Temperature Scene).

Ⅱ.working conditions

1.Altitude ≤ 1000m (customized derating solution available for high-altitude areas)

2.Relative humidity≤90% (no condensation, high humidity environment can strengthen sealing);

3.Adapted to neutral point insulation system: supporting direct grounding, resistive/arc extinguishing coil grounding, etc.

4.Normal operating ambient temperature: – 25°C~ + 40°C ;

5.In cold areas (-40°C), heating devices can be added to ensure low-temperature start and operation;

6.For high-temperature environments (+50°C), choose H-class insulation + reinforced cooling to ensure stability.

Note: Beyond the above conditions, it needs to be reduced for use, and special environments (high altitude, high temperature, severe cold, explosion-proof, etc.) can be customized.

Ⅲ.Type of experiment

1.Routine tests: winding resistance measurement, voltage ratio measurement, short-circuit impedance measurement, load loss measurement, no-load loss measurement, power frequency withstand voltage test

2.Type test: temperature rise test, lightning impact test, sound level measurement, short circuit tolerance test

Ⅳ.Component inspection

1.Iron core: magnetic permeability, loss value detection

2.Winding: inter-turn withstand pressure, local volume detection

3.Insulation materials: heat resistance grade, flame retardant test

4.Cooling system: fan performance, protection level verification

V.Types of certifications

1.Safety certification: UL/CE/CQC

2.Energy efficiency certification: GB 20052 energy efficiency level 1

3.Environmental certification: RoHS/REACH

4.Special certifications: Explosion-proof certification (ATEX), classification society certification

Note: All products have passed a full set of routine tests before leaving the factory, and the type test report can be queried.

Structural Features

Ⅰ.Product characteristics:

DKSC series dry-type grounding transformers are designed for isolated neutral three-phase power systems. Utilizing a ZN zigzag connection to derive a system neutral point, they support direct or resistor/arc suppression coil grounding. Constructed with epoxy resin vacuum casting, these transformers offer a fully enclosed, high-insulation, oil-free, and maintenance-free design with fire and moisture resistance. Suitable for 6–35kV applications, they are widely used in substations, industrial grids, and rail transit.

Ⅱ.Product advantages

1.High reliability: dry structure has no risk of oil leakage, stable insulation performance, and long life;

2.Strong adaptability: supports -40°C low temperature (heating optional) to +50°C high temperature (H-class insulation + forced air cooling) operation;

3.Functional integration: It has both voltage conversion and ground fault protection functions, with fast response and strong fault current limiting ability.

4.Safety and environmental protection: oil-free design, good flame retardant, in line with the requirements of modern green power grid;

5.International compatibility: Support 50Hz/60Hz power grid, no special customization required, strong versatility.

Ⅲ.Benefits of the product

1.Improve system safety: quickly lead out the neutral point and achieve grounding protection, reducing the risk of grid failure;

2.Reduce operation and maintenance costs: maintenance-free design, no need to change oil and check oil level, reduce labor and material costs;

3.Enhance grid adaptability: Wide temperature zone operation provides reliable protection for extreme climate areas;

4.Easy for export and application: Comply with IEC, CE, UL and other national standards, global use, low entry threshold;

5.Space-saving and supporting equipment: Integrated grounding function eliminates the need for an external grounding box or additional protection devices.

Ⅳ.Evidence

1.Technical certification: Passed IEC 60076, IEC 60289 and other international standards, with CE, UL, TÜV certification, proving its safety and reliability;

2.Structural process: epoxy resin vacuum casting technology provides measured data support for mechanical strength and insulation properties;

3.Operation record: It has been in stable operation in many substations and rail transit projects around the world, with low failure rate.

4.Service guarantee: Provide global rapid response service and 10-year spare parts support to ensure worry-free long-term use;

5.User feedback: Domestic and foreign power companies and industrial users report that it is easy to maintain, adaptable and low comprehensive cost.

Product structure

35kV voltage is higher. Core: larger, firmer fixation. Windings: thicker insulation, greater distance, more complex (multi – segmented) winding, thicker insulation material, higher process reqs (e.g., double vacuum casting). Cooling: mostly forced air cooling, stronger heat – dissipation. Auxiliaries: stricter shell & grounding protection.

Ⅰ.Iron core

1.Materials: mainly high-quality cold-rolled silicon steel sheets (high permeability, low loss), high-performance models can choose amorphous alloys (lower no-load loss, better energy saving).

2.Structure: split lamination type (silicon steel sheets are staggered and stacked, mature technology, easy maintenance) and winding type (silicon steel strip is continuously wound, high permeability, low noise, and the process is more complex).

3.Grounding design: Special grounding treatment to prevent static electricity accumulation and partial discharge, ensuring operational safety.

Ⅱ.Winding

1.Materials: mostly high-purity copper (excellent conductivity, strong current carrying), aluminum (lightweight, low cost) in some scenarios.

2.Winding: cylindrical multi-layer winding, isolated by insulating materials between layers, simple structure and stable electrical and mechanical properties.

3.Grounding winding: Unique ZN zigzag wiring artificially leads to the neutral point to provide grounding protection for the system. In case of fault, it quickly conducts and shuts off the current to protect the equipment (different from the core design of ordinary dry-type transformers).

Ⅲ.Insulation system

1.Materials: Epoxy resin as the core (excellent insulation, mechanical strength, corrosion resistance), with glass fiber (enhanced strength) and insulating paper (interlayer / end insulation).

2.Process: Vacuum casting molding makes the insulation material closely bonded with the winding, forming an overall structure that can withstand short-circuit electric force and mechanical stress.

Ⅳ.Cooling system

1.Natural air cooling (AN): Relies on air convection for heat dissipation, suitable for small capacity, low load scenarios, simple structure, low cost, and maintenance-free.

2.Forced air cooling (AF): Equipped with cooling fans and thermostats, automatically start at high temperatures, enhance heat dissipation, and adapt to large-capacity, high-load, or high-temperature environments.

Ⅴ.Other auxiliary parts

1.Shell: Metal/non-metallic material, protection level is IP20 (indoor dustproof), IP54 (outdoor dustproof and splashproof), IP65 (harsh environment fully sealed).

2.Temperature monitoring: Sensors and controllers are included to monitor the winding/core temperature in real time, alarm or start-stop cooling system when the time limit is over.

3.Terminal block: Copper/aluminum, strong conductivity, easy installation and maintenance, to ensure reliable circuit connection.

Specification

额定容量 (KVA)
Rated capacity		 高压 (KV)
H.V		 低压 (KV)
L.V		 连接组标号Connection symbol 空载损耗 (KW)
No-load loss		 负载损耗（KW）On-load loss 短路阻抗（%）Short circult impedance
10 11 13 10 11 13
30 6
6.3
6.6
10
10.5
11		 0.4 Dyn11/Yyn0 0.190 0.170 0.135 0.710 0.710 0.640 4.0
50 0.270 0.240 0.195 1.000 1.000 0.900
80 0.370 0.330 0.265 1.380 1.380 1.240
100 0.400 0.360 0.290 1.570 1.570 1.410
125 0.470 0.420 0.340 1.850 1.850 1.660
160 0.540 0.480 0.385 2.130 2.130 1.910
200 0.620 0.550 0.445 2.530 2.530 2.270
250 0.720 0.640 0.515 2.760 2.760 2.480
315 0.880 0.790 0.635 3.470 3.470 3.120
400 0.980 0.880 0.705 3.990 3.990 3.590
500 1.160 1.040 0.835 4.880 4.880 4.390
630 1.340 1.200 0.965 5.880 5.880 5.290
630 1.300 1.170 0.935 5.960 5.960 5.360 6.0
800 1.520 1.360 1.090 6.960 6.960 6.260
1000 1.770 1.590 1.270 8.130 8.130 7.310
1250 2.090 1.880 1.500 9.690 9.690 8.720
1600 2.450 2.200 1.760 11.700 11.700 10.500
2000 3.050 2.740 2.190 14.400 14.400 13.000
2500 3.600 3.240 2.590 17.100 17.100 15.400
额定容量 (KVA)
Rated capacity		 高压 (KV)
H.V		 低压 (KV)
L.V		 连接组标号Connection symbol 空载损耗 (KW)
No-load loss		 负载损耗（KW）On-load loss 短路阻抗（%）Short circult impedance
12 14 18 12 14 18
30 6
6.3
6.6
10
10.5
11		 0.4 Dyn11/Yyn0 0.150 0.130 0.105 0.710 0.640 0.640 4.0
50 0.215 0.185 0.155 1.000 0.900 0.900
80 0.295 0.250 0.210 1.380 1.240 1.240
100 0.320 0.270 0.230 1.570 1.415 1.415
125 0.375 0.320 0.270 1.850 1.665 1.665
160 0.430 0.365 0.310 2.130 1.915 1.915
200 0.495 0.420 0.360 2.530 2.275 2.275
250 0.575 0.490 0.415 2.760 2.485 2.485
315 0.705 0.600 0.510 3.470 3.125 3.125
400 0.785 0.665 0.570 3.990 3.590 3.590
500 0.930 0.790 0.670 4.880 4.390 4.390
630 1.070 0.910 0.775 5.880 5.290 5.290
630 1.040 0.885 0.750 5.960 5.365 5.365 6.0
800 1.215 1.035 0.875 6.960 6.265 6.265
1000 1.415 1.205 1.020 8.130 7.315 7.315
1250 1.670 1.420 1.205 9.690 8.720 8.720
1600 1.960 1.665 1.415 11.730 10.555 10.555
2000 2.440 2.075 1.760 14.450 13.005 13.005
2500 2.880 2.450 2.080 17.170 15.445 15.445
额定容量 (KVA)
Rated capacity		 高压 (KV)
H.V		 低压 (KV)
L.V		 连接组标号Connection symbol 空载损耗 (KW)
No-load loss		 负载损耗 (KW)
On-load loss		 短路阻抗（%）Short circult impedance
10 11 12 13 10 11 12 13
50 35
36
37
38.5		 0.4 Dyn11/Yyn0 0.450 0.405 0.360 0.315 1.420 1.420 1.420 1.278 6.0
100 0.630 0.567 0.504 0.441 2.090 2.090 2.090 1.881
160 0.790 0.711 0.632 0.553 2.810 2.810 2.810 2.529
200 0.880 0.792 0.704 0.616 3.320 3.320 3.320 2.988
250 0.990 0.891 0.792 0.693 3.800 3.800 3.800 3.420
315 1.170 1.503 0.936 0.819 4.510 4.510 4.510 4.059
400 1.370 1.233 1.096 0.959 5.410 5.410 5.410 4.869
500 1.620 1.458 1.296 1.134 6.650 6.650 6.650 5.985
630 1.860 1.674 1.488 1.302 7.690 7.690 7.690 6.921
800 2.160 1.944 1.728 1.512 9.120 9.120 9.120 8.208
1000 2.430 2.187 1.944 1.701 10.400 10.400 10.400 9.360
1250 2.830 2.547 2.264 1.981 12.700 12.700 12.700 111.430
1600 3.240 2.916 2.592 2.268 15.400 15.400 15.400 13.860
2000 3.820 3.438 3.056 2.674 18.200 18.200 18.200 16.380
2500 4.450 4.005 3.560 3.115 21.800 21.800 21.800 19.620

FAQS

DKSC Series Dry-Type Grounding Transformer FAQs

You may want to know the following questions and answers when purchasing.

Ⅰ.Basic Concepts

Oil-immersed transformers, dry-type transformers, pre-installed substations, high and low voltage switchgear and supporting power equipment

Supplement: Covers 10kV-500kV full voltage level, maximum capacity 500MVA

The key is the grounding protection function!

Grounded dry-type transformers are “converters with protection functions”, which can not only convert voltage, but also ensure the safety of system grounding through special design, and are the key equipment for grid fault protection.

1.DKSC series has a dedicated grounding winding (like ZN zigzag wiring), which can quickly draw out the neutral point, limit the fault current, and directly realize the system grounding protection;

2.Ordinary dry-type transformers are only responsible for voltage conversion, and there is no special grounding design, and additional grounding equipment is required to achieve similar functions, which is more expensive and slower to respond.

It must be determined based on the nominal voltage, grounding mode, and maximum fault current of the system!

For example, a 10kV neutral point is grounded by an arc suppression coil, and the matching capacity is suitable according to 1.2 – 1.5 times the total capacitance current of the system. You only need to provide the grid parameters (voltage, load, grounding method, etc.), and our technical team will choose the model for free to accurately adapt to your system.

①Safety performance: dry type has no fire risk and can be close to densely populated areas; The oil-immersed type requires fire prevention measures, and leakage may pollute the environment.

②Applicable scenarios: dry type is used indoor, medium and low voltage (≤ 35kV), power ≤ 30MVA; The oil-immersed type is used outdoor, high voltage (≥ 110kV), power ≥ 30MVA.

③Maintenance cost: dry type only needs dust removal and winding inspection (1-2 years); The oil-immersed type requires regular oil testing, oil filtration/oil change (3-5 years).

④Environmental performance: dry type pollution-free, RoHS compliant; The oil-immersed type requires a leak-proof design, and synthetic ester oil is degradable but the cost is high.

⑤Energy efficiency performance: dry full load efficiency of 98%-99%, high temperature needs to be reduced capacity; The oil-immersed type has a full load efficiency of 99%+ and is suitable for high-temperature environments.

⑥Service life: dry type 20-30 years (H grade can reach 40 years); Oil-immersed type 30-50 years (when the oil quality is good).

 

Selection suggestions

Choose dry type: indoor installation, high safety requirements, and easy maintenance scenarios

 

Choose oil-immersed type: high-capacity, high-pressure, outdoor installation scenarios

①35kV is suitable for large-capacity, high-voltage grid access scenarios above 2000kVA (such as regional substations, new energy booster stations), with higher insulation requirements (the withstand voltage value is about 2 times that of 10kV), and the structure is more complex;

②10kV is suitable for terminal power distribution below 2500kVA (such as factories and commercial centers), and the cost and maintenance are lower. The selection should give priority to matching the voltage and capacity requirements of the upper power grid.

The core difference between the two lies in energy efficiency and cost characteristics, which are recommended to be selected according to actual application needs:

①Amorphous Alloy Transformer (SCBH)

No-load loss is 60-70% lower than traditional silicon steel transformers, with great long-term energy savings and strong environmental benefits.

Higher initial cost (core materials cost 30-50% more).

Best for long idle periods, stable loads, and electricity cost-sensitive settings: data centers, commercial buildings, hospitals.

②Epoxy resin transformer (SCB).

Low initial cost, mature silicon steel technology, better short-term value.

High mechanical strength, strong short-circuit resistance, low noise, and adapts well to complex environments.

Ideal for standard industrial power distribution, high short-circuit risk, or stability-critical scenarios: factories, general power systems.

Selection suggestions:

If the focus is on long-term energy saving, long operating time, and stable load, choose SCBH;

If you are concerned about initial cost, short-circuit resistance and wide adaptability, choose SCB.

①Commercial complex: Dry-type transformer (AN cooling), high fire protection requirements, easy maintenance

②Offshore wind power booster station: oil-immersed transformer (synthetic ester oil), high power demand, anti-corrosion design

③Metro power distribution: dry-type transformer (H-class insulation), low-smoke halogen-free, moisture-proof and shockproof

④Oil platform: oil-immersed transformer (Ex d explosion-proof), explosion-proof certification, salt spray resistant

Notes:

①Dry-type transformer derating of 1% per 1°C at ambient temperature > 40°C

②The oil-immersed type needs to be equipped with an oil pool (capacity ≥ 100% oil volume) or a nitrogen fire extinguishing system

Large-scale projects can adopt the combination scheme of “dry change + oil change”

Ⅱ.Technical parameters

①Rated voltage

600V to 35kV on the primary side, 208V-480V on the secondary side, can be customized

②Power capacity

• Low power: 5-500kVA (commercial buildings and small equipment)

• Medium power: 500-2500kVA (data centers, medium-sized factories)

• High power: 2.5MVA+ (substation, heavy industry), maximum capacity 25MVA

③Insulation grade

• Class A (105°C): General Environment

• Class B (130°C): Slightly higher temperature resistance requirements

• Class F (155°C): Industrial Harsh Environments (Mainstream Choice)

• Class H (180°C): High temperature (e.g. smelting, steel mill)

• Rated R (220°C): Extreme environment applications

 

We offer a full range of insulation grades and cooling solutions that support customization.

①Efficiency performance

• No-load efficiency: up to 98%-99%

• Peak efficiency point of load: 60%-70% load

• Loss control: Reduce no-load and load losses through material and design optimization

Comply with global energy efficiency standards

②International standard: IEC 60076-20

• European Union: Ecodesign Regulation Tier 1 (2015) and Tier 2 (2021)

• North America: DOE 2016 in the United States, CSA C802.2 in Canada

• China: GB 20052-2020 (Level 1 Energy Efficiency Maximum)

• India: BEE Star Certification (1 to 5 Stars)

• ANZ: MEPS Energy Efficiency Specification

③Energy efficient design and technology

• Core material: high magnetic conductivity silicon steel or amorphous alloy, no-load loss reduced by 15%-30%

• Winding Optimization: Low-resistance copper windings or optimized aluminum winding designs to reduce load losses

• Insulation system: H/R grade high-temperature resistant material to improve thermal efficiency and life

• Intelligent cooling: intelligent temperature control and forced air cooling system dynamically adjust energy consumption

④Compliance benefits

• Economic benefits: 10%-30% reduction in energy costs over the life cycle

• Environmental Benefits: Reducing greenhouse gas emissions and supporting carbon neutrality

• Policy dividends: Meet DOE/EU Tier 2 and other standards, and enjoy tax rebates and subsidies

⑤The design, manufacture and inspection of dry-type transformers and all their parts and accessories produced by our company comply with the latest standards below.

• Basic general: IEC 60076-1 / GB/T 1094.1-2013, GB/T 1094.11-2022

• Energy efficiency and environmental protection: GB 20052-2020, T/CEEIA 258-2016

• Insulation withstand voltage: IEC 60076-3 / GB/T 1094.3-2017, GB/T 26218.1(2)-2010

• Test and testing: DL/T 596-1996, GB/T 50150-2016, IEC 60270 / GB/T 7354-2003

• Short circuit resistance: IEC 60076-5 / GB/T 1094.5-2008

• Temperature rise cooling: IEC 60076-2/GB/T 1094.2-2013, JB/T 8971-2013

• Acoustic performance: GB/T 1094.10-2022

• Protective structure: GB/T 4208-2008, JB/T 9639-1999

• Operation and maintenance: DL/T 572-1995

• High voltage test: GB/T 16927.1-2011 / GB/T 16927.2-2013

 

• Special applications: GB/T 10228-2023, GB/T 1094.12-2013

①Natural cooling (AN)

• Features: Fanless, silent design (<55dB)

• Applicable: Below 2500kVA, silent places such as commercial buildings

• Advantages: Zero additional energy consumption, maintenance-free and low cost

②Forced Air Cooling (AF)

• Features: Fan heat dissipation, support overload operation

• Applicable: above 1000kVA, high temperature and high load scenarios such as industrial plants

• Advantages: Increase capacity by 25-50%, adapt to harsh environments

③Hybrid Cooling (AN/AF)

• Features: Intelligent temperature control automatic switching

• Applicable: Data centers and other situations where the load fluctuates

• Advantages: Energy saving of 30-50%, both silent and efficient

Selection suggestions:

• Commercial premises: Natural cooling (AN)

• Industrial Scenario: Forced Air Cooling (AF)

• Fluctuating Load: Hybrid Cooling (AN/AF)

Customization options such as IP54 dustproof fans and intelligent temperature control are available.

Support full parameter customization (voltage 0.4-500kV, frequency 50/60Hz, protection level up to IP68, special environment adaptation)

①Electrical parameter customization: voltage 0.4-35kV input, 0.23-13.8kV output; capacity 10kVA~25MVA (expandable to 50MVA).

②Material selection: copper winding (efficiency 98.5%+) or aluminum winding (cost reduction of 30%); Oriented silicon steel or amorphous alloy core

③Cooling system: AN/AF/AN+AF intelligent switching; Heat pipe assists heat dissipation (temperature rise and fall 15K).

④Protection design: IP23 to IP66; Galvanized steel or 316 stainless steel (salt spray test > 1000h).

⑤Special environmental adaptation: high-altitude capacity correction; Explosion-proof certification (ATEX Zone 1/2).

⑥Intelligent functions: PT100 temperature measurement + IoT monitoring (4G/fiber); Dynamic volume adjustment technology

⑦Installation adaptation: floor-mounted, wall-mounted (≤500kVA), rail type; Narrow body structure (width compression 20%)

⑧Industry special customization: wind power special (anti-vibration, anti-tilt); Mining transformer (reinforced enclosure + 150% overload capacity).

⑨Global certification support: UL+cUL (North America), CE+TUV (EU), CQC+Energy Efficiency Label (China).

⑩Customized Processes: Requirements analysis→ scheme design→ prototype testing→ mass production

⑪Value-added customized cases: data center efficient silence solution, Antarctic research station extreme cold solution, chemical plant explosion-proof solution

 

Note: The non-standard customization cycle is 30%-50% longer, and there may be additional costs for extreme environment design.

Ⅲ.Installation and application

①environmental conditions

• Temperature: Standard ambient ≤ 40°C, overtemperature needs to be reduced (1% reduction for every 1°C increase)

• Humidity: Relative humidity < 95% (no condensation), IP55 shell is required for humid environments

• Pollution level: Coastal areas need Level IV protection design

②Space requirements

• Natural cooling (AN): 600mm ≥ all sides, 800mm ≥ top

• Forced air cooling (AF): 300mm ≥ on the inlet side and 500mm ≥ on the outlet side, reserving space for maintenance

③Foundation vs. fixation

• Foundation load-bearing: ≥1.5 times the weight of the transformer (including accessories)

• Mounting method: Floor-mounted (M16 anchor bolts), wall-mounted (load-bearing bracket≥ 200% safe load)

• Seismic fortification: Shock absorbers are installed

④Electrical safety

• Safety distance: 125mm between phases ≥of 10kV system, 100mm ≥ to ground (35kV requires ≥300mm)

• Grounding resistance: ≤4Ω (independent grounding), multiple units need to ≤ 1Ω

• Cable bending: Cross-linked cable ≥ 15 times the diameter

⑤Protective measures

• Enclosure protection: IP54/IP65 outdoor, IP20 indoor

• Fire protection requirements: F1 flame retardant (flame spread ≤ 100mm), refractory materials (≥2h)

⑥Special environment

• Explosion-proof area: Zone 1 requires ATEX certification (flameproof enclosure Ex d)

• High altitude: 1% capacity reduction for every 100m of elevation at > 1000m

 

It is recommended to have professional engineers guide the installation on site.

①Altitude adaptability

• Standard range: ≤1000m

• High altitude scheme (1000-5000m): 1% capacity reduction for every 100m of elevation, strengthening insulation, and upgrading forced air cooling

Example: A 2000kVA transformer has an usable capacity of 1500kVA at 3500m

②Temperature adaptability

• Conventional range: -25°C~+40°C (natural cooling)

• Low temperature scheme (-50°C): pre-heating device (PTC heater) + H-class insulation

• High temperature solution (+60°C): 1% volume reduction per °C when exceeding 40°C, using hybrid cooling (AN/AF automatic switching)

③Special environment configuration

High altitude type (4000m+): Pressurized air duct + anti-corona treatment

Extreme cold type (-50°C): low-temperature lubricating oil + stainless steel fasteners

Desert type (+60°C): sunscreen coating (reflectivity ≥80%) + IP54 + sand and dust resistant seal

④Typical application scenarios

• Plateau substation (3000m, -30~+35°C): 15% capacity reduction + H-class insulation + AF cooling, 25 years of life

• Polar research station (-50~+20°C): pre-heating system + fully enclosed IP55, life of 20 years

• Middle East Oilfield (-10~+55°C): Mixed cooling + sunscreen + corrosion-resistant plating, 18 years of life

Support customized solutions according to specific altitude and temperature.

①Noise source and range

• Core magnetostriction: 45-60dB

• Cooling system: natural cooling 40-55dB, forced air cooling 55-70dB

• Load impact: 30% load drop by 5dB, 100% load increase by 3-5dB

②Noise reduction technology and effect

• Core optimization (stepped lamination + high magnetic conductivity silicon steel): 5-8dB reduction, cost +8-12%

• Cooling system noise reduction (low-noise fan + variable speed control): 10-15dB reduction, cost +5-10%

• Vibration isolation installation (rubber mat + spring bracket): 3-5dB reduction, cost +3-5%

• Sound insulation cover (double-layer steel plate + sound-absorbing cotton): 15-25dB reduction, cost +15-25%

③Scene noise limit

• Residential area at night: ≤45dB (AN cooling + vibration isolation required)

• Commercial Daytime: ≤60dB (AF Cooling + Basic Vibration Isolation Allowed)

• Industrial area: ≤75dB (can be directly installed with AF cooling)

④Testing and customization

• Test standard: Background noise is 10dB lower than the sound source, measurement distance 1m (ANSI) or 0.3m (IEC)

• Ultra-quiet solution: ≤ 48dB (2000kVA) in AN mode, equipped with step laminated iron core + silicone rubber shock absorber

Note: The actual noise needs to consider on-site factors, and it is recommended to simulate the sound field.

Ⅳ. Operation and maintenance and assurance

No! Routine maintenance once every 1-2 years is sufficient, mainly for surface dust removal, insulation resistance measurement, and grounding connection check; Forced air-cooled models have their lower fan status checked annually.

Compared with oil-immersed transformers, the dry structure is maintenance-free, saving the troubles of oil change and oil level checking, and the operation and maintenance cost is much lower.

①Life expectancy

• Standard condition: 20-30 years (regular load, indoor environment, basic maintenance).

• Ideal conditions: more than 40 years (optimized load, strict maintenance, class H insulation).

• Harsh environment: < 15 years (high temperature and high humidity/no protection).

②Life factors and maintenance points

• Material selection

Adopt H-grade insulation to extend the life by 5-10 years

Amorphous alloy/high magnetic conductivity silicon steel core can extend the life of 10-15 years

• Operational control

Optimal 80% load rate

For every 10°C increase in ambient temperature, life is reduced by 50%

Harmonic THD>5% will shorten the life by 20%-40%

• Environmental requirements

Indoor: Humidity < 70% + regular dusting

Outdoor: IP55/IP65 protection required

• Maintenance measures

Real-time monitoring of hot spot temperature (H-level ≤ 180°C)

Annual inspection: winding resistance, partial discharge

Three-year test: short-circuit impedance

Continuous monitoring of harmonic THD (target<5%)

③Life extension program

• Customized solution: H-grade insulation + copper winding (promised 35 years of life, annual inspection required)

• Intelligent monitoring: Install IoT remote monitoring system

• Maintenance plan: Establish a preventive maintenance system and record operating data

By optimizing material selection, operational control, and maintenance strategies, dry-type transformer lifespan can be significantly extended. It is recommended to choose the appropriate configuration and maintenance scenario according to the specific application environment.

Strong environmental adaptability! For high temperatures in the Middle East, H-class insulation (withstand 180°C) + forced air cooling scheme is available;

In the face of high humidity in Southeast Asia, it adopts moisture-proof epoxy resin + IP54/IP65 protection (dustproof and waterproof), -25°C~+50°C wide temperature range design, covering extreme environments such as deserts and rainforests.

Triple transportation protection!

①Packaged in a fully enclosed wooden case (in line with international shipping standards), filled with cushioning material;

②additional reinforcement of key components (windings, cores);

 

③Provide sea/air reinforcement solutions, with detailed installation and commissioning guides, and can remotely guide acceptance after arrival.

The basic warranty is 24 months, which can be extended to 5 years

Supplement: Warranty covers manufacturing defects with free remote technical support

Worldwide quick response! 7×24 hours Multilingual remote technical support (English, Spanish, Arabic, etc.); Overseas core regions (Europe, America, the Middle East, Southeast Asia) promise 72-120 hours of on-site service; Configure full-time overseas service representatives for full-cycle follow-up, 10-year spare parts supply (price ≤110% of the original price), and a team of certified engineers to quickly repair faults.

Our dry-type transformer products meet the world’s mainstream certification requirements and pass rigorous extreme conditions to provide customized solutions for special application environments.

①Certification system

Quality Management System: ISO 9001, ISO 14001, ISO 45001

International electrotechnical standards: IEC 60076-11, IEC 60076-16, IEC 60529

②Regional Market Certification:

• NA: UL 1561, UL 1446, CSA C22.2 No.47

• EU: RoHS, REACH, EU Ecodesign

• US: DOE 2016, ANSI/IEEE C57.12.01

• UK: BS EN 60076-11

Special application certifications: DNV GL/ABS (Marine/Offshore Platforms), IEC 60332-3/IEC 61034 (Fire Safety).

③Validation test

The product has been tested under a number of extreme conditions to ensure reliability:

• High altitude test: IEC 60076-3 (power frequency withstand voltage test, +20% voltage).

• Low temperature start test: GB/T 2423.1 (-50°C cold start, 2 hours).

• High temperature operation test: GB/T 2423.2 (+60°C continuous full load thermal stability test).

④Selection suggestions

• Base Market: ISO 9001 + IEC 60076-11 + Regional Safety Certifications (UL/CSA/CQC).

• EU market: RoHS/REACH/EU Ecodesign added

• Special environments: Optional IP protection, wind power or marine certification

 

The company’s products have passed international mainstream certifications, supporting global market compliance access, and can provide customized solutions for specific application needs.

Full cooperation!

We can assist in contacting international testing institutions such as SGS and Intertek to provide factory test reports and certification documents.

 

For overseas special certifications (such as SASO in the Middle East and CSA in North America), the technical team assists in the preparation of materials and on-site testing throughout the process to ensure the implementation of project compliance.

Ⅴ. Frequently Asked Questions

After receiving the complete technical parameters, within 24 hours for standard products and 48 hours for customized products

Key parameters such as rated capacity, voltage level, and insulation level need to be provided

15 working days for standard products, 25-40 working days for customized products

Expedited service can be reduced to 10 working days (20% expedited fee)

Sea freight about $800-$3000/container (40HQ), land freight $0.5-$1.2/km

 

Provide EXW/FOB/CIF and other trade terms, including professional export packaging

We offer flexible payment options, the common ones are:

T/T: 30% deposit, 70% paid before shipment.

L/C: Accept L/C at sight.

For long-term cooperation, we can provide more favorable terms.

①61 years of manufacturing experience (established in 1963), fully automatic production line (±0.1mm accuracy), ISO 9001/14001 dual certification, 48-hour global emergency service

②Spare sleeves, special kits, and multilingual manuals are included with the goods

③Free installation guidance videos, lifetime cost optimization consultation, trade-in discounts for old equipment, and exclusive energy efficiency audit services for strategic customers

①Regular consultation: response time within 2 hours, operation guidance, parameter query, support 400 call/WhatsApp

②Emergency fault handling: response time within 30 minutes (7×24 hours), remote diagnosis + on-site engineer dispatch (72 hours worldwide arrival).

③Preventive maintenance: appointment arrangement, annual inspection + oil sample testing (oil immersion type), customer portal independent appointment

Note: Export products meet IEC standards, and additional UL/CE/PES and other certifications can be provided (cycle increase by 2-3 weeks). Customized products require a 30% advance payment, and the 3D model is provided before production.

Why Choose us ？

Built to last, engineered to perform.

Kete Transformer is a key national-level manufacturer specializing in transformers, recognized as a “Contract-Honoring and Promise-Keeping” enterprise, a high-tech enterprise, and a national-level enterprise technology center. It is recommended in the national directory for rural and urban power grid construction and renovation, as well as a recommended supplier of major electromechanical equipment for hydropower projects. Its products have been awarded the title of “National Quality Inspection Qualified Product – Quality Trustworthy Product” and “Nationally Recognized Product for Mechanical Industry Users.

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Our Project

Our products not only dominate the domestic market but are also exported to more than 30 countries and regions, including Russia, Southeast Asia, Africa, and the Americas, serving industries such as power, municipal engineering, metallurgy, and petrochemicals.

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