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Fengguang Transformer

Oil-Immersed Transformer

35kV On-Load Tap-Changing Transformers

Voltage regulation under load for 35 kV industrial and utility networks.

23

Models

GB/IEC

Standards

50+

Countries

Quick answer. Voltage regulation under load for 35 kV industrial and utility networks. Fengguang supplies 23 published models and variants in this family, with project-specific windings, cooling, protection and finish confirmed on the approved datasheet.

23 models

Available models

10 kV Standard Prefabricated Substation — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
10 kV

10 kV Standard Prefabricated Substation

The 10kV State Grid Standard Prefabricated Substation (Metallic Type) is designed in strict compliance with State Grid standards…

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10 kV State Grid Standard Prefabricated Substation — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
10 kV

10 kV State Grid Standard Prefabricated Substation

This prefabricated substation meets the requirements of specifications such as Standardized Design and Customization Scheme for 10…

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Compact Assembled Box Electrical Substation — Fengguang Transformer 35kV On-Load Tap-Changing Transformer

Compact Assembled Box Electrical Substation

Innovative Product Integrating Advantages of American and European Box-Type Substations

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YB Series Pre-Assembled Substation(European Box Variable) — Fengguang Transformer 35kV On-Load Tap-Changing Transformer

YB Series Pre-Assembled Substation(European Box Variable)

The high-voltage/low-voltage prefabricated substation can quickly respond to power distribution needs in multiple scenarios such a…

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1000 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
1,000 kVA 35 kV

1000 kVA 35 kV Oil-Immersed power Transformer

The core of the industry's pain points lies in the poor adaptability of medium and high voltage Power Distribution Equipment , the…

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1000 kVA 35 kV Oil-Immersed Transformer Low Loss — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
1,000 kVA 35 kV

1000 kVA 35 kV Oil-Immersed Transformer Low Loss

Low-Loss 35KV 1000KVA Oil-immersed Transformer for Stable Power Supply in Industrial Power Distribution

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1600 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
1,600 kVA 35 kV

1600 kVA 35 kV Oil-Immersed power Transformer

The industry's pain points mainly lie in the insufficient stability of high- Power Distribution Equipment , the difficulty in expa…

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1600 kVA 35 kV Oil-Immersed Transformer High Efficiency — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
1,600 kVA 35 kV

1600 kVA 35 kV Oil-Immersed Transformer High Efficiency

High-Efficiency 1600KVA 35KV Oil-immersed Transformer Adapted to Multiple Power Transmission Scenarios

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2000 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
2,000 kVA 35 kV

2000 kVA 35 kV Oil-Immersed power Transformer

The industry's pain points lie in the difficulties of integrating ultra-large-capacity Power Distribution Equipment at the grid le…

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2000 kVA 35 kV Oil-Immersed Transformer Pure Copper — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
2,000 kVA 35 kV

2000 kVA 35 kV Oil-Immersed Transformer Pure Copper

35KV 2000KVA All-Copper Oil-immersed Transformer : Stable Power Supply for Multiple Power Engineering Scenarios

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3150 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
3,150 kVA 35 kV

3150 kVA 35 kV Oil-Immersed power Transformer

The industry's pain points lie in the insufficient stability of ultra-high- Power Distribution Equipment , the high difficulty of…

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3150 kVA 35 kV Oil-Immersed Transformer High Performance — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
3,150 kVA 35 kV

3150 kVA 35 kV Oil-Immersed Transformer High Performance

High-performance 3150KVA 35KV Oil-immersed Transformer provides stable power supply suitable for various power engineering scenari…

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4000 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
4,000 kVA 35 kV

4000 kVA 35 kV Oil-Immersed power Transformer

The industry pain points are that large-capacity Power Distribution Equipment is prone to overload, has poor grid compatibility an…

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4000 kVA 35 kV Oil-Immersed Transformer High Efficiency — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
4,000 kVA 35 kV

4000 kVA 35 kV Oil-Immersed Transformer High Efficiency

4000KVA 35KV High Efficiency Oil-immersed Transformer : Energy-Saving Power Supply Equipment for Industrial Power Grids

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5000 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
5,000 kVA 35 kV

5000 kVA 35 kV Oil-Immersed power Transformer

The industry's pain points lie in the insufficient stability, weak shock resistance, and high difficulty in grid connection of lar…

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5000 kVA 35 kV Oil-Immersed Transformer Pure Copper — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
5,000 kVA 35 kV

5000 kVA 35 kV Oil-Immersed Transformer Pure Copper

35KV 5000KVA Pure Copper Winding Oil Immersed Transformer : Adaptable to Multiple Power Supply Scenarios in the Power Grid

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8000 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
8,000 kVA 35 kV

8000 kVA 35 kV Oil-Immersed power Transformer

The industry's pain points lie in the fact that large-capacity Power Distribution Equipment is prone to overload, poor heat dissip…

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8000 kVA 35 kV Oil-Immersed Transformer Low Loss — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
8,000 kVA 35 kV

8000 kVA 35 kV Oil-Immersed Transformer Low Loss

8000KVA 35KV Low Loss Oil Immersed Transformer - Industrial Power Voltage Stabilization and Transmission Equipment Currently, powe…

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10000 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
10,000 kVA 35 kV

10000 kVA 35 kV Oil-Immersed power Transformer

The industry pain points lie in the fact that ultra-large-capacity Power Distribution Equipment is prone to overload, has unbalanc…

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10000 kVA 35 kV Oil-Immersed Transformer High Performance — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
10,000 kVA 35 kV

10000 kVA 35 kV Oil-Immersed Transformer High Performance

High-Performance 10000KVA 35KV Oil-immersed Transformer : Stably Adaptable to Large-Scale Power Transmission and Distribution Proj…

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20000 kVA 35 kV Oil-Immersed Transformer No Excitation — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
20,000 kVA 35 kV

20000 kVA 35 kV Oil-Immersed Transformer No Excitation

20000KVA 35KV Oil-immersed Transformer for Industrial Power Grid Stabilization and Distribution

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31500 kVA 35 kV Oil-Immersed power Transformer — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
31,500 kVA 35 kV

31500 kVA 35 kV Oil-Immersed power Transformer

The industry's pain points lie in the insufficient stability of ultra-high voltage super-large capacity Power Distribution Equipme…

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31500 kVA 35 kV Oil-Immersed Transformer Low Loss — Fengguang Transformer 35kV On-Load Tap-Changing Transformer
31,500 kVA 35 kV

31500 kVA 35 kV Oil-Immersed Transformer Low Loss

31500KVA 35KV Low Loss Oil Immersed Transformer : Energy-Saving Power Supply Equipment for Industrial Power Grids Currently, the h…

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Selection notes

How to read this family

On-load tap-changing (OLTC) transformers regulate the secondary voltage while the load is energised. They are used where the incoming voltage varies, where the load is cyclic, or where a fixed tap cannot keep the downstream voltage inside limits.

Fengguang builds 35 kV OLTC transformers from 1,000 to 31,500 kVA for industrial main substations, utility distribution and renewable-energy step-up. The design combines a high-voltage winding with controlled impulse distribution, a robust clamping structure for short-circuit duty, and a tap changer selected for the required tap range and operating frequency.

OLTC selection is a system decision. The tap range, step voltage, number of operations and maintenance access must be agreed with the protection and operations teams. For remote sites, a maintenance-free or vacuum OLTC option may be preferable, and the cooling design must allow for the additional losses at the extreme taps.

Buyer questions

Questions to settle before the datasheet

What is an on-load tap-changing transformer?
It changes tap position while the transformer is energised and supplying load. This keeps the secondary voltage stable when the primary voltage or the load changes, without a shutdown.
How many tap positions are typical?
A common distribution OLTC has ±8 steps of 1.25 % or ±10 steps, but the range is project-specific. The correct range comes from the measured supply variation and the allowed secondary voltage band.
Does an OLTC require more maintenance?
Yes. The tap changer has moving contacts and its own insulating oil or vacuum chamber. Maintenance intervals depend on the number of operations and the manufacturer's instructions; the site access and spares plan should reflect that.
Can the transformer be paralleled with an existing unit?
Yes, if the ratio, impedance, tap range and vector group are compatible. A parallel-operation study should be completed before the datasheet is approved.