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6-35kV Oil-Immersed Transformer

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Oil-lmmersed Power Transformer

ur 6-35kV oil-immersed power transformer series is designed for reliable, efficient power distribution in utility, industrial, and renewable energy applications. Covering a wide voltage range from 6kV up to 35kV, these transformers are fully customizable to meet your specific project requirements – whether you need a standard distribution unit or a special impedance/rectifier design.

Email：info@byttransformers.com

Product Pictures

6-35kV Oil-immersed Power Transformer
Overview
Our 6-35kV oil-immersed power transformer series is designed for reliable, efficient power distribution in utility, industrial, and renewable energy applications. Covering a wide voltage range from 6kV up to 35kV, these transformers are fully customizable to meet your specific project requirements – whether you need a standard distribution unit or a special impedance/rectifier design.

Key Features
Wide voltage coverage – Available in voltage classes: 6kV, 10kV, 11kV, 13.2kV, 13.8kV, 15kV, 20kV, 22kV, 24kV, 30kV, 33kV, and 35kV.

Customizable capacity – From 30kVA up to 20,000kVA (20MVA).

Loss levels – Standard, medium, low, and ultra‑low losses (meeting or exceeding IEC 60076 and EU Eco Design Tier 2 requirements). Ultra‑low loss units can adopt amorphous alloy cores.

Tap changers – Off‑circuit (NLTC) or on‑load (OLTC), providing precise voltage regulation.

Cooling methods – ONAN (natural) or ONAF (forced air), adaptable to site conditions.

Robust construction – Conservator or hermetically sealed tanks with fin‑type radiators, suitable for outdoor installation in harsh environments (ambient temperature from -40°C to +55°C, altitude up to 4000m).

Standards compliance – Designed and tested according to IEC 60076, with optional compliance to GB, NBR, or other national standards.

Quality Assurance
Every transformer undergoes routine tests in our own laboratory. We also offer witness tests and can arrange third‑party inspection at accredited laboratories upon request. Our factory holds ISO 9001, ISO 14001, and CE certifications.

Typical Applications
Power distribution – Substations, rural grids, industrial parks, commercial complexes (with transformer installed outdoors or in dedicated fire‑proof transformer rooms).

Renewable energy – Solar and wind power plants requiring medium‑voltage step‑up (e.g., 0.4/6‑35kV).

Industrial – Mines, cement plants, oil & gas facilities, and other heavy industries where oil‑immersed transformers are permitted.

Infrastructure – Railways, ports, pumping stations, and irrigation projects.

⚠️ Important note
Oil‑immersed transformers contain mineral oil. For indoor installations in high‑rise buildings, subways, airports, or other densely populated spaces, please refer to our dry‑type transformer series .

Why Choose KAIBEITE?
15+ years of manufacturing experience.

Full customization – Voltage, capacity, loss level, winding material, accessories.

Global track record – Exported to more than 20 countries including Ethiopia, Tanzania, Russia, Brazil, and the Philippines.

Fast delivery – Standard lead time 15‑30 working days after order confirmation.

Responsive support – Technical assistance, installation guidance, and warranty service.

Technical Parameters (example)
Parameter   Value Range
Rated power   30 – 2500 kVA (distribution); up to 20000 kVA (OLTC)
HV voltage   6 – 35 kV
LV voltage   0.2 – 1.1 kV (customizable)
Vector group   Dyn11, Yyn0, YNd11, etc.
Tapping range   ±2×2.5% (NLTC) or ±8×1.25% (OLTC)
Insulation level   HV: 45/60/70/85/95 kV (lightning impulse 105/125/170/200 kV)
No‑load loss   IEC standard or better
Load loss   IEC standard or better

Product Parameter

30-2500KVA 6-11KV Oil-Immersed Transformer
Rated Capacity (kVA)	Voltage Combination			Vector Group	No-Load Loss(w)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
Rated Capacity (kVA)	High Voltage（kV)	Tapping Range	Low Voltage (kV)	Vector Group	No-Load Loss(w)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
30	6-11	±5% ±2×2.5%	0.4	Dyn/Ynd Yzn/Yyn	100	630	2.0	4
50					130	910	2.0
63					150	1090	1.9
80					180	1310	1.5
100					200	1580	1.5
125					240	1890	1.3
160					280	2310	1.3
200					340	2730	1.1
250					400	3200	1.1
315					480	3830	1.0
400					570	4520	1.0
500					680	5410	1.0
630					810	6200	0.9	4.5
800					980	7500	0.85
1000					1150	10300	0.85
1250					1360	12000	0.85
1600					1640	14500	0.85
2000					1940	19500	0.7	5
2500					2290	21200	0.7	5

30-2500KVA 20KV Oil-immersed transformer
Rated Capacity (kVA)	Voltage Combination			Vector Group	No-Load Loss(w)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
Rated Capacity (kVA)	High Voltage（kV)	Tapping Range	Low Voltage (kV)	Vector Group	No-Load Loss(w)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
30	20-24	±5% ±2×2.5%	0.4	Dyn/Ynd Yzn/Yyn	90	690	2.1	5.5
50					130	1010	2
63					150	1200	1.9
80					180	1440	1.8
100					200	1730	1.6
125					240	2080	1.5
160					290	2540	1.4
200					340	3000	1.3
250					400	3520	1.2
315					480	4210	1.1
400					570	4970	1
500					680	5940	1
630					810	6820	0.9	6
800					980	8250	0.8
1000					1150	11330	0.7
1250					1380	13200	0.7
1600					1660	15950	0.6
2000					1950	19140	0.6
2500					2340	22200	0.5

50-2500KVA 33-38.5KV Oil-Immersed Transformer
Rated Capacity (kVA)	Voltage Combination			Vector Group	No-Load Loss(w)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
Rated Capacity (kVA)	High Voltage（kV)	Tapping Range	Low Voltage (kV)	Vector Group	No-Load Loss(w)	Load Loss	No-Load Current (%)	Short Circuit Impedance (%)
50	30-38.5	±5% ±2×2.5%	0.4	Dyn/Ynd Yzn/Yyn	170	1200	2.1	6.5
100					230	2010	2.0
125					270	2370	1.5
160					290	2820	1.4
200					340	3320	1.3
250					400	3950	1.2
315					480	4750	1.1
400					580	5740	1.0
500					680	6910	1.0
630					830	7860	0.9
800					980	9400	0.8
1000					1150	11500	0.7
1250					1400	13900	0.6
1600					1690	16600	0.6
2000					1990	19700	0.6
2500					2360	23200	0.6

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Payment & Delvery

FAQ

Q1.Do you have MOQ?

Depends on different ideas, Can be negotiated.The larger the quantity is, the competitive the unit price will be.

Q2.Should the customer pay the delivery fee,How much is it?

For the delivery fee, many samples are be requested to be sent,so we must get delivery fee. If you tell me to use the appointed Express, you will give me your express account or you will pay according to the Express.

If you do not request, I will choose a cheap one in China.

Q3.How about the after sale service?

1)We will always keep the quality the same as the buyer's samples and if there is something with the quality, we will make compensation for our customers. 2)We will suggest our packing and take charge in our packing, we will keep the goods safe in the delivery. 3)We will trace the goods from the production to selling, we will solve the problems in the selling for our customers.

Q4.When can I get a price？

We usually quote within 24 hours after we get your inquiry.

Q5: Are you a trade company or manufacturer?

We are a professional manufacturer with our own factory.

Key words:

Oil Immersed Transformer

6kV

10KV

11KV

22KV

3000kVA/33/400V

35KV

On-Load Tap Changer（OLTC）oil-immersed transformer

Rectifier and Furnace Transformers

On-Load Tap Changer（OLTC）oil-immersed transformer

Rectifier and Furnace Transformers

Product Classification

Oil-lmmersed Power Transformer

Dry-Type Power Transformer

High And Low Voltage Switchgears

Other Products

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