ZSG/ZHS Series Special Rectifier Transformer
Scope of Application
Aluminum Smelting
Rectifier transformers are indispensable in the aluminum smelting industry. They step down high-voltage AC power and supply the necessary low-voltage DC power to aluminum reduction cells. This DC power drives the electrolytic process that converts alumina into molten aluminum.
Cathodic Protection
Rectifier transformers used in cathodic protection systems help prevent corrosion in buried or submerged metal structures, such as pipelines, storage tanks, and offshore structures. By supplying a controlled DC voltage to the structure, they induce a protective electrochemical reaction that slows or prevents the corrosion process.
Electrochemical Processes
Rectifier transformers are utilized in various electrochemical processes that require the generation or control of DC voltage. These include electroplating, electrolysis, water electrolysis, and other electrochemical manufacturing processes. They provide the necessary DC voltage and current for these applications.
High-Voltage Direct Current (HVDC) Systems
Rectifier transformers play a critical role in HVDC systems, which are used to transmit large amounts of power over long distances. They convert AC voltage from the grid into high-voltage DC power for transmission via HVDC lines. This enables efficient long-distance power transmission, often facilitating connections between different power grids or linking offshore wind farms to the mainland.
Product Description
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1 - Specialized Harmonic Mitigation: Customized phase-shifting vector groups target the 5th, 7th, and 11th harmonics generated by rectifier equipment; this suppresses harmonics at the source and boosts the power factor, eliminating the need for passive filters.
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2 - Short-Circuit Protection for Thyristors: High-impedance windings constrain short-circuit currents to safe levels, preventing the instantaneous high currents from damaging the thyristor components within the rectifier cabinet.
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3 - Resilient Against Harmonic-Induced Heating: Class H insulation withstands the additional temperature rise caused by harmonic circulating currents, ensuring the coils do not burn out even under continuous overload.
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4 - Flexible Structural Options: Choose epoxy-cast dry-type units for high-standard sites or fully sealed oil-immersed units for harsh environments—the same electrical specifications are available in either enclosure type.
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5 - Voltage Regulation Adapts to Operating Conditions: Multi-tap voltage regulation allows the output to adjust dynamically with changes in the production line's DC load, ensuring voltage stability.
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6 - Automatic High-Temperature Alarms: Built-in temperature sensors trigger remote alarms upon overheating, eliminating the need for constant manual monitoring.
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Main parameters
Voltage and Capacity Range: Input: 10kV/20kV/35kV; Capacity: 300–16000kVA; DC output customized upon request.
Rectification Configuration: Standard 6-pulse; customizable 12-pulse or 24-pulse phase-shifting rectifier units.
Cooling Method: Oil-immersed: ONAN (self-cooled) or ONAF (forced-air cooled); Dry-type: AN (natural air cooling) or AF (forced air cooling).
Winding Connection Group: Customizable (e.g., Dd0, Dy11, or special phase-shifting configurations) to meet harmonic mitigation requirements.
Execution standards
Technical advantages
Hanzhong XinSanhuan rectifier transformers are purpose-built for high-power rectification applications—such as metallurgy, chemical processing, electrolysis/electroplating, and variable-frequency drives—delivering three core benefits: harmonic mitigation, short-circuit resilience, and thermal durability. They neutralize characteristic harmonics (5th, 7th, and 11th orders) at the source via customized phase-shifting vector groups, significantly reducing harmonic distortion and boosting the power factor while eliminating the need for external filtering equipment. A high-impedance winding design limits short-circuit currents to levels safe for thyristors and other rectifier components, preventing costly equipment burnout during sudden faults. An H-class heat-resistant insulation system easily handles the additional temperature rise caused by harmonic circulating currents, ensuring operation without derating or winding failure even under overload conditions. Available in both epoxy-cast dry-type and fully sealed oil-immersed configurations, these transformers adapt to diverse installation environments; multi-tap voltage regulation flexibly accommodates DC load fluctuations, while built-in temperature sensors enable remote over-temperature alarms, meeting the rigorous reliability demands of continuous production. In short: they ensure stable rectifier operation, cause no grid disturbances, and minimize maintenance concerns.