Brief Overview
Our high-efficiency 330kV three-phase double-winding oil immersed transformer adopts off-circuit unexcited tap changing for voltage adjustment, specially developed for regional HV substations, large-scale grid interconnection projects, thermal power plants and hydropower stations.
Optimized magnetic circuit and premium core & winding structure cut core and copper losses sharply to reach over 99.2% full-load efficiency. The off-circuit voltage regulation design realizes accurate voltage matching under changing load, while oil immersed structure guarantees reliable insulation and heat dissipation for long-term continuous running in national backbone power grids.
Key Features
Off-circuit unexcited tap changer design enables precise voltage regulation without live operation, adaptable to fluctuating grid loads
Low-loss laminated core plus high-purity copper winding, full-load operational efficiency over 99.2%, greatly lowering long-term power consumption loss
Full oil immersed structure with qualified mineral insulating oil, outstanding dielectric property and steady thermal performance for 330kV high voltage working condition
Heavy-duty anti-corrosion steel tank, stably operated in coastal humid, extreme temperature and heavily polluted industrial areas
Specially customized 330kV high voltage bushing with reliable insulation; built-in pressure relief equipment to protect unit against sudden circuit faults
Standard ONAN natural cooling, optional ONAF/OFAF forced cooling for peak-load working scenarios
Reserved SCADA compatible monitoring ports to realize real-time running data collection and remote equipment management
Running noise controlled below 65dB(A)@1m, satisfies environmental protection standards for suburban and urban substation layout
Eco-friendly recyclable raw materials, conforming to international environmental protection specifications
Detailed Description
This 330kV double winding high voltage transformer is core equipment for national high-voltage transmission backbone grid. Different from on-load tap transformers, it applies unexcited off-circuit tap regulation: voltage adjustment needs power cut, featuring simpler structure, lower failure rate and more cost-effective investment for stable base-load power stations and main substations.
Hermetically sealed oil immersed construction isolates internal core and windings from external moisture and dust, extending service cycle and reducing routine maintenance frequency. Compact overall layout saves substation floor space and facilitates upgrading and reconstruction of existing power station equipment.
It bears strong anti-short-circuit and anti-overvoltage capability, effectively resisting grid surge voltage and harmonic interference during grid operation. Widely used for boosting generator outgoing voltage in thermal & hydropower plants for long-distance power delivery, as well as linking different regional power grids to realize cross-area power mutual supply.
Application Scenarios
Regional 330kV high voltage main substations for urban & provincial power grid construction
Cross-region large power grid interconnection projects between adjacent power supply areas
Large-scale conventional thermal power plants for generator terminal voltage boosting
Centralized hydropower station outgoing transmission matching project
Key national power transmission backbone infrastructure construction
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