10KV Fully Sealed Three-phase Oil-immersed Power Distribution Transformer

10kv Oil immersed Transformer Types

For HENAN GNEE ELECTRIC CO., LTD., a 10kv transformer can be a three-phase oil immersed transformer, or a column mounted three-phase oil immersed transformer. These types of transformers have the same principle, but their structures are different, and different types of transformers have different applications. HENAN GNEE ELECTRIC CO., LTD. provides you with the most ideal solution.

• 10kV three-phase oil immersed transformer (rated voltage 6kV-35kV)
• Install a three-phase oil immersed transformer (rated voltage 2.4kv-34.5kv) on an 10kV column

With advanced core and winding designs, these transformers deliver low energy loss, excellent cooling, and long service life.The corrugated tank design compensates for oil volume changes caused by temperature fluctuations, improving operational stability.The transformers are sealed to prevent oxygen and moisture ingress, ensuring optimal insulation and oil longevity.Safety features, including pressure release and gas relay options, enhance reliability for critical installations.

 

10kv Oil immersed Transformer Technical Specifications

---

- Input voltage: 10kV

- Output voltage: 0.4kV 0.415 kv 0.420kv 0.430kv 0.440kv
- Capacity: 30-2500 kva
- Frequency: 50/60 HZ
- Remark: voltage, capacity, frequency, connection group and loss can be customized according to customer requirements

S11 Capacity	Rated voltage&Off-load tapping				Vector GroupSymbol		NO-load loss(W)	Load loss(W)	NO-load current(%)	Short circuit impedance(%)
	H.V(kv)	High pressure Tap range(%)		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
63 kva							150	1090/1040	1.2	4
80 kva							180	1310/1250	1.2	4
100 kva							200	1580/1500	1.1	4
125 kva							240	1890/1800	1.1	4
160 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
630 kva							810	6200	0.6	4.5
800 kva							980	7500	0.6	4.5
1000 kva							1150	10300	0.6	4.5
1250 kva							1360	12000	0.5	4.5
1600 kva							1640	14500	0.5	4.5
2000 kva							1940	18300	0.4	5
2500 kva							2290	21200	0.4	5

 

10kV Dual-Winding On-Load (No Excitation Voltage Regulation) Fully Sealed Oil-Immersed Distribution Transformer

Capacity: 30~2000
Main Technical Parameters: Rated voltage 10kV, rated capacity ≤ 2000kVA, types 9, 10, and 11, dual-winding on-load (no excitation voltage regulation) fully sealed oil-immersed distribution transformer.
Main Applications: Power plants, substations, industrial and mining enterprises, user distribution stations, and other 10kV distribution systems.

 

Our company produces oil-immersed power transformers for 35kV and below, which have been developed based on the absorption of advanced domestic technology and tailored for the urban and rural power grid transformation in China. The performance indicators of these products exceed the requirements of GB/T6451-1999 "Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers," fully comply with the manufacturing standards of GB1094.1.2-1996, GB1094.3.5-2003 "Power Transformers," and the IEC-76 standards recommended by the International Electrotechnical Commission. These products feature low loss, low noise, and no core-lifting design, resulting in significant improvements in safety, reliability, and economy.

 

10kV Dual-Winding On-Load (No Excitation Voltage Regulation) Fully Sealed Oil-Immersed Power Transformer

Capacity: 800~2500
Main Technical Parameters: Rated voltage 10kV, rated capacity ≤ 2500kVA, 9 type, 10 type, 11 type, dual-winding on-load (no excitation voltage regulation) fully sealed oil-immersed power transformer.
Main Application Fields: Power plants, power stations, industrial and mining enterprises, user distribution stations, and other 10kV power systems.

 

Our company's oil-immersed power transformers for 35kV and below are developed based on the absorption of advanced domestic technologies and are specially designed for the urban and rural power grid renovation in China. The product performance exceeds the standards of GB/T6451-1999 Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers, fully complies with GB1094.1.2-1996, GB1094.3.5-2003 Power Transformers manufacturing standards, and the International Electrotechnical Commission (IEC) recommendation IEC-76. This product features low loss, low noise, and a core-lifting-free design, significantly enhancing safety, reliability, and economy.

 

The S11/S13/S20/S22 Series 10KV Fully Sealed Oil-Immersed Transformers are designed for AC systems operating at 50Hz/60Hz with rated working voltages of up to 20kV. These electrical transformers are ideal for power distribution in sectors like petroleum, metallurgy, chemical, textile, and light industries. Their robust design makes them suitable for dusty environments and demanding power substations.

 

• High-Efficiency Core: The transformer core is made of high-permeability, grain-oriented cold-rolled silicon steel sheets. Featuring a new structure with fully mitered joints and stepped circular cross-sections, the core minimizes energy loss and noise.

 

• Reliable Windings: The windings are designed with corrugated oil ducts and non-impregnated processes, secured with compression bands. High-voltage windings come with taps to adjust the voltage as required, with tap changers conveniently located on the tank lid for easy operation after power disconnection.

 

• Safety Protection Devices: Models ranging from 30 to 2000kVA are equipped with pressure relief valves and optional gas relays with alarm and tripping terminals to enhance operational safety.

 

• Advanced Oil Cooling System: The transformer features a corrugated wall tank with integrated cooling and "breathing" functions, eliminating the need for an oil conservator. The vacuum oil-filling process ensures no moisture or air contamination, enhancing the longevity of the AC transformer and reducing maintenance requirements.

10kv Oil immersed Transformer Standar & Certifaication

---

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 10kV 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 10kv transformer allows short-term overload to 150% of rated capacity for no more than 2 hours, but requires monitoring of oil temperature (≤ 95 ℃).

Against the backdrop of global electricity demand growth, 10kV 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 East Asia, Central Asia, Southeast Asia, South Asia, etc

 

10kv Oil immersed Transformer Case show

50-2500kVA/20(10)kV Low-Loss Oil Immersed Transformer(hermetically Sealed Oil Filled Transformer)

S11

● High voltage side voltage: 10kV, 20kV

● Low voltage Side voltage: 0.4kV

● Tapping Range: ±2×2.5%

● Transformer Vector Group: Yyn0 or Dyn11

● Tap Changer: NLTC or OLTC

● Certification: ISO9001, IEC60076, etc.

Note: More parameters can be customized according to customer requirements.

 

This S11-20(10)kV dual voltage oil immersed transformer is an upgraded version of the classic S9 series. Its biggest feature is that it can flexibly switch voltage (10kV or 20kV). This is particularly suitable for the needs of power grid upgrades. It can withstand more short-circuit current than the old S9 (capacity increased by 30%) and has lower noise during operation (reduced by about 5 decibels). It also adopts a fully sealed design that does not leak oil and is extremely energy-saving (20% energy-saving than S9).

 

S11-50~2500kVA/20(10)kV Whole-sealed Type Distribution Power Transformer Technical parameters

Rated Capacity (kVA)	Voltage			Marks	No-Load Loss (W)	On-Load Loss (W)	Short cirait-z (%)	No-Load Cur (%)	Weight(kg)			Size(mm)	Distance (mm)
	V (kV)	Chng (%)	V (kV)						Wain w.t	Oil w.t	Ttl w.t	L·W·H
50	20 10	±2×2.5	0.4	Dyn11 Or Yyn0	130	870	4	2	280	125	560	850×600×1260	400×400
80					180	1250		1.8	350	140	680	1030×680×1320	400×450
100					200	1500		1.6	470	155	800	1060×680×1370	400×450
125					240	1800		1.5	500	175	870	1110×700×1380	450×500
160					290	2200		1.4	520	190	980	1080×700×1430	550×550
200					330	2600		1.3	670	220	1200	1150×740×1500	550×550
250					400	3050		1.2	770	240	1310	1270×740×1510	550×550
315					480	3650		1.1	800	250	1400	1240×780×1550	550×550
400					570	4300	4.5	1	970	280	1600	1300×910×1580	660×660
500					680	5150		1	1100	315	1850	1400×870×1600	660×660
630					810	6200		0.9	1330	355	2200	1410×870×1700	660×660
800					980	7500		0.8	1590	430	2550	1480×920×1780	820×820
1000					1150	10300		0.7	1700	475	2800	1630×1090×1800	820×820
1250					1360	12000		0.6	1980	525	3200	1700×1130×1840	820×820
1600					1640	14500		0.6	2280	585	3800	1840×1250×1890	820×820
2000					2020	17820		0.5	2460	720	4600	1910×1330×1930	1000×1000
2500					2380	20700		0.5	2900	800	5200	1980×1380×1980	1070×1070

 

Note:

1. The diagonal load loss values ​​in the table below apply to products in the Dyn11 connection group.

2. If you need to know the technical parameters, dimensions and weight data of 10kV large-capacity distribution transformers, please contact us.

3. We can provide transformers with various voltage levels, short-circuit impedances and coupling methods according to user needs.

4. The weight and size data in the table are for reference only.

 

Application Scope

1. Normal use environment: altitude not exceeding 1000m; temperature range: -25℃-+40℃

2. Special environment: Altitude over 1000m; Temperature range: -45℃-+40℃

3. Relative humidity: ≤90% (+25℃)

4. Installation location: No corrosive gas, no obvious stains.

5. This product is suitable for industrial and agricultural lighting and power transmission.

 

10kv Oil immersed Transformer FAQ

---

What is an 10kV 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 10kV/400V). It is widely used in industrial, commercial, and power grid distribution.

 

What are the typical application scenarios?

*Voltage conversion of urban distribution network (10kV → 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?

The common capacity ranges from 25kVA to 10MVA, with the 100kVA to 2000kVA models of 10kV/400V being the most widely used, depending on the load requirements.

 

What is the difference in maintenance cycle between 10kV 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 three-phase oil immersed transformer and dry-type transformer?

-10kV oil immersed transformers are suitable for outdoor, high-capacity, and high load scenarios, with low cost but requiring regular maintenance;

-10kV 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.

 

 

What are the reasons for the abnormal temperature rise during operation?

-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 ?

*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 ?

-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.