35kV Three Phase Oil Immersed Distribution Transformer

Application: High Voltage Transmission and Low Voltage Power Distribution
Rated Voltage: 35kV
Frequency: 50Hz / 60Hz
Cooling Type: Oil-Immersed, ONAN
Type: Three-Phase

Application

35kV Three-Phase Oil-Immersed Power Distribution Transformer

Product Overview

Our 35kV Three-Phase Oil-Immersed Power Distribution Transformers are specially designed for use in 35kV power distribution grids, supporting AC 50Hz or 60Hz three-phase systems. These transformers play a key role in efficient high-voltage transmission and low-voltage power supply.

Featuring high efficiency and low loss, this series of transformers helps customers significantly reduce power consumption and operating costs while delivering excellent social and environmental benefits. The product is widely used in:

Power Plants
Substations
Industrial and Mining Enterprises
Ports and Airports
Urban & Rural Power Grids

Equipped with an On-Load Tap Changer (OLTC), the transformer allows for manual or automatic voltage adjustment without shutdown, helping to stabilize voltage across the power grid and enhance power quality in load centers.

Standards

The product is designed and tested according to international standards:

IEC 60076-1:2011 — General
IEC 60076-2:2011 — Temperature rise for liquid-immersed transformers
IEC 60076-3:2013 + AMD1:2018 — Insulation levels, dielectric tests, external clearances
IEC 60076-5:2006 — Ability to withstand short circuit
IEC 60076-10:2016 — Determination of sound levels

Specifications

Operating Conditions

Ambient Temperature: -25°C to +40°C
- Monthly average temperature: ≤ +30°C
- Annual average temperature: ≤ +20°C
Altitude: ≤ 1000m
Power Supply Waveform: Similar to sine wave
Voltage Symmetry: Three-phase voltage approximately symmetrical
Harmonic Content: Total harmonic distortion of load current ≤ 5% of rated current
Installation Site: Indoor or Outdoor

Product Features

> Core

Made of high magnetic conductivity, grain-oriented, cold-rolled silicon steel sheet
Low no-load loss
Optimized core design for improved performance

> Windings

Three-phase concentric coil winding with corrugated oil ducts
No paint dipping process; tightly wound with banding for high mechanical strength
Balanced ampere-turn distribution and superior short-circuit resistance

> Mechanical Design

Enhanced positioning structure to prevent displacement during transportation
All fasteners equipped with lock nuts to ensure long-term stability
Fully sealed structure with vacuum oil filling process, eliminating internal moisture and preventing oil aging

> Oil Tank

Corrugated oil tank with simple processing, high strength, and leak-proof design
Improved oil circulation enhances heat dissipation performance
Compact, aesthetically pleasing, space-saving, maintenance-free solution

> Safety Features

All transformers are equipped with pressure relief valves
Optional gas relay with alarm and trip functions available as per customer requirements
Designed for safe and reliable long-term operation

Parameter

Technical Specification

1.35kV Technical parameters of non-excitation voltage regulating transformer

Rated Capacity (kVA)	High voltage (kV)	Tapping range	Low voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)
50	35 38.5	±2×2.5% ±5%	0.4	Dyn11 Yyn0	6.5	160	1200/1140	1.3
100						230	2010/1910	1.1
125						270	2370/2260	1.1
160						280	2820/2680	1.0
200						310	3320/3160	1.0
250						400	3950/3760	0.95
315						480	4750/4530	0.95
400						580	5740/5470	0.85
500						680	6910/6580	0.85
630						830	7860	0.65
800						980	9400	0.65
1000						1150	11500	0.65
1250						1400	13900	0.6
1600						1690	16600	0.6
2000						1990	19700	0.55
2500						2360	23200	0.55

2.35kV Technical parameters of non-excitation voltage regulating transformer

Rated Capacity (kVA)	High voltage (kV)	Tapping range	Low voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)
630	35	±2×2.5% ±5%	3.15 6.3 10.5	Yd11	6.5	830	7860	0.65
800						980	9400	0.65
1000						1150	11500	0.65
1250						1400	13900	0.55
1600						1690	16600	0.45
2000						2170	18300	0.45
2500						2560	19600	0.45
3150	35~38.5	±2×2.5% ±5%	3.15 6.3 10.5		7.0	3040	23000	0.45
4000						3610	27300	0.45
5000						4320	31300	0.45
6300					8.0	5240	35000	0.45
8000	35~38.5	±2×2.5%	3.15 3.3 6.3 6.6 10.5	YNd11		7200	38100	0.35
10000						8700	45300	0.35
12500						10000	53800	0.3
16000						12100	65800	0.3
20000						14400	79500	0.3
25000					10.0	17000	94000	0.25
31500					10.0	20200	112000	0.25

3.35kV Technical parameters of on load tap changer

Rated Capacity (kVA)	High voltage (kV)	Tapping range	Low voltage (kV)	Vector Group	Impedance Voltage (%)	No-load Loss (W)	Load Loss (W)	No-Ioad current (%)
2000	35	±3×2.5%	6.3 10.5	Yd11	6.5	2300	19200	0.5
2500	35		6.3 10.5		6.5	2720	20600	0.5
3150	35~38.5		6.3 10.5		7.0	3230	24700	0.5
4000						3870	29100	0.5
5000						4640	34200	0.5
6300					8.0	5630	36700	0.5
8000	35~38.5		6.3 6.6 10.5	YNd11		7870	40600	0.4
10000						9280	48000	0.4
12500						1090	56800	0.35
16000						1310	70300	0.35
20000						1550	82100	0.35
25000					10.0	1830	97800	0.3
31500					10.0	2180	116000	0.3

Benefits

High efficiency and energy savings
Low operational and maintenance costs
Compact design, space-saving
Long service life with minimal maintenance
International standard compliance
Flexible customization options available

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Product Category

hot-sale product

Application: Power Distribution
Country of Origin: China
Certifications: ISO9001, CB, CE, KEMA

Professional oil immersed distribution transformer manufacturer
Transformer rated voltage: 6.3kV,10kV,11kV,13.2kV,13.8kV,15kV, 20kV, 22kV, 33kV, 35kV

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