I. Product Overview

The 35kV Oil‑immersed Transformer Is A Medium‑high Voltage Oil‑immersed Power Transformer (Maximum System Voltage Um=40.5kV). It Is Designed And Manufactured In Accordance With GB1094, GB/T6451, IEC60076 And Other Standards. Adopting Transformer Oil As Insulation And Cooling Medium, It Is Widely Used In Power Distribution And Medium‑small Power Transformation Scenarios To Realize Voltage Step‑up/step‑down And Electric Energy Distribution. The Product Is Mainly Three‑phase Two‑winding Type, While Three‑winding Models Are Available Upon Request. It Is Divided Into Two Regulation Types: Off‑circuit Tap Changing And On‑load Tap Changing.

II. Basic Structural Composition

Active Part: Core Made Of High‑magnetism Cold‑rolled Grain‑oriented Silicon Steel Sheets With Full‑mitred Joints; Oxygen‑free Copper Windings With Optimized Insulation Structure, Reliable Short‑circuit Resistance And Fastened & Formed Leads.

Tank And Cooling System: Steel‑plate Welded Tank. Corrugated Fully‑sealed Tanks Are Commonly Adopted For Medium And Small Capacities. Mainstream Cooling Modes: ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced).

Insulating Medium: Mineral Insulating Oil. Environment‑friendly Degradable Ester Insulating Oil Is Optional For Insulation, Heat Conduction And Arc Extinction.

Auxiliary Fittings: High‑voltage And Low‑voltage Bushings, Tap‑changers, Oil Conservators (Or Corrugated Fully‑sealed Structure Without Oil Conservator), Gas Relay, Pressure Relief Valve, Oil Level Indicator, Temperature Controller, Cooling Fans (For Air‑cooled Type). On‑line Monitoring Devices Are Optional.

III. Main Product Features

High Efficiency And Energy Saving: Mainstream Low‑loss Energy‑efficiency Series Including S22, S20, S18. Optimized Core And Winding Design Reduces No‑load Loss And Load Loss For Low Operating Energy Consumption.

Stable And Reliable Operation: Adopts Vacuum Drying And Vacuum Oil‑filling Processes With Excellent Insulation Performance And Low Partial Discharge Level, Suitable For Long‑term Continuous Operation.

Fully‑sealed Anti‑leakage: Corrugated Tank Fully‑sealed Structure Isolated From Air And Moisture To Slow Down Oil Aging And Greatly Reduce Routine Maintenance.

Low Noise: Vibration‑damping Core And Noise‑reducing Tank Design Meet Noise Limit Requirements For Factory Zones And Residential Surroundings.

Compact Structure And Convenient Installation: Smaller Size Compared With High‑voltage Grade Transformers With Simple Foundation Construction, Suitable For Outdoor Pole‑mounted, Box‑transformer Built‑in And Indoor Layout.

Optional Intelligent Functions: Equippable With Oil Temperature Monitoring, Winding Temperature Measurement, Oil Level Alarm And Other Devices For Connection To Distribution Automation System.

IV. Typical Application Scenarios

‑ 35kV Public Substations In Counties And Towns, Urban‑rural Distribution Network Renovation Projects ‑ Medium‑small Photovoltaic And Wind Power Step‑up Collection Stations ‑ Self‑supplied Power Distribution Systems For Mines, Chemical Plants, Building‑material Factories And Manufacturing Plants ‑ Power Supply For Rail Transit, Water Conservancy Pump Stations, Industrial Parks And Large‑scale Commercial Complexes ‑ Built‑in Main Transformer For 35kV Box‑type Substations

Common Connection Group: YNd11; Voltage Regulation: Mostly Off‑circuit Tap Changing, On‑load Tap Changing Is Optional For Critical Loads.