I. Product Overview

The On‑load Tap‑changing Rectifier Transformer Is A Special‑purpose Transformer Dedicated For Rectifier Loads. It Can Realize Voltage Regulation Under Load Without Power‑off, And Is Designed And Manufactured In Accordance With Relevant Standards Such As GB1094 And JB/T8636. Matched With Rectifiers On The Output Side, It Converts Alternating Current Into Direct Current. It Is Widely Used In Industrial Fields Requiring Stable DC Power Supply, And Can Be Designed As Oil‑immersed Or Dry‑type Structure According To Working Conditions.

II. Structural Composition

The Complete Unit Mainly Consists Of Core, Grid‑side Windings, Multiple Valve‑side Windings, On‑load Tap‑changer, Oil Tank (For Oil‑immersed Type), Cooling System, High‑low Voltage Bushings And Supporting Protection & Monitoring Components. The Core Adopts High‑magnetism Cold‑rolled Grain‑oriented Silicon Steel Sheets. Multiple Independent Windings Are Usually Designed On The Valve Side To Meet Wiring Requirements Of Rectifier Circuits (6‑pulse, 12‑pulse, 24‑pulse) And Suppress Harmonics.

III. Voltage Regulation Features

Equipped With On‑load Tap‑changer, The Output Voltage Can Be Adjusted Without Power Cut‑off During Load Operation With Fast Response To Adapt To Wide‑range Load Fluctuations. The Number Of Tap Steps And Voltage Regulation Range Can Be Customized According To Process Requirements To Ensure Stable DC Voltage After Rectification And Meet Continuous Production Requirements, Which Is Different From Conventional Off‑circuit Tap‑changing Transformers.

IV. Cooling Modes

Mainstream Cooling Modes For Oil‑immersed Type Are ONAN, ONAF And OFAF. For Large‑capacity Products, Forced‑oil‑circulation Air Cooling Is Adopted. Dry‑type Rectifier Transformers Can Adopt AN And AF Air‑cooling Modes. For Large‑capacity And High‑heat‑generation Working Conditions, Forced‑circulation Cooling Is Preferred To Control Temperature Rise And Ensure Long‑term Full‑load Operation Of Equipment.

V. Harmonic And Insulation Design

The Magnetic Circuit Is Optimized Aiming At Harmonics And DC Magnetic Bias Caused By Rectifier Loads To Reduce Harmonic Losses. Vacuum Drying And Vacuum Oil‑filling Processes Are Adopted For Oil‑immersed Type. The Electric‑field Distribution Between Windings Is Optimized With Strict Control Over Partial Discharge. The Valve‑side Windings Bear Relatively High Voltage Pulsation, So The Insulation Structure Is Specially Reinforced To Withstand Over‑voltage Impacts Under Rectifier Working Conditions.

VI. Short‑circuit Resistance And Mechanical Performance

Transposed Conductors Are Adopted For Windings, While End‑part Insulation And Supports Are Reinforced And Fastened. The Overall Structure Is Verified By Short‑circuit Force Simulation. Rectifier Equipment Is Prone To Impact Loads And Short‑circuit Faults. Featuring High Mechanical Strength, The Product Can Resist Valve‑side Short‑circuit And Surge Current Impacts, And Its Anti‑seismic Performance Meets Requirements For Long‑distance Transportation And On‑site Operation.

VII. Energy Consumption And Noise Reduction Optimization

Optimized Core And Winding Structure Reduces Basic Losses And Additional Harmonic Losses To Improve Operating Economy. Noise Reduction Measures Including Vibration‑damped Core And Sound‑insulated Oil Tank Are Adopted To Lower Operating Noise And Meet Environmental Protection Limits Of Factory Zones. Low‑loss Materials Are Optional Upon User Requirements For Energy‑saving Renovation Projects.

VIII. Protection And Intelligent Monitoring

Standard Protections Include Gas Relay Protection, Pressure Relief, Oil Temperature / Winding Temperature Measurement And Oil Level Monitoring. Optional On‑line Monitoring Devices Cover Oil Chromatography, Partial Discharge And On‑load Tap‑changer. It Real‑time Monitors Tap‑changer Operations And Contact Wear, And Can Be Connected To Automatic Control System For Condition‑based Maintenance.

IX. Typical Application Scenarios

It Is Widely Applied In Industries Including Electrolytic Aluminum, Chlor‑alkali Chemical Industry, Non‑ferrous Metal Smelting, DC Motor Speed Regulation, Electroplating, Sewage Treatment, High‑power Variable‑frequency Drive, Energy Storage Power Conversion And Rail Transit Traction Power Supply. As The Core Supporting Equipment For Rectifier Power Supply, It Provides Controllable AC Input Power For Rectifiers.