HV Oil-immersed Power Transformers-60kV 63kV 66kV 69kV

Yes, regular testing and replacement based on oil quality are required. An oil quality test (including dielectric loss, breakdown voltage, water content and other indicators) is usually conducted every 3–5 years. If the oil quality deteriorates or is severely contaminated, filtration, purification or full replacement must be carried out in a timely manner to ensure the insulation and heat dissipation performance meet the standards.

Q:What is the overload capacity of a HV oil-immersed transformers?

A:Under normal circumstances, it can withstand 1.1 times the rated load for long-term operation, and can bear 1.25–1.5 times the overload load for a short period (within 2 hours). The specific overload capacity shall be determined according to the transformer model, cooling method and ambient temperature. It is recommended to refer to the product technical parameter table.

Q:What are the advantages of HV oil-immersed transformers compared with dry-type transformers?

A:In high-voltage scenarios, oil-immersed transformers have higher heat dissipation efficiency and stronger overload capacity. Moreover, the arc-extinguishing characteristics of insulating oil can reduce the risk of internal faults, and the service life is longer (usually 5–10 years longer than dry-type transformers). They are more suitable for outdoor, heavy-load and high-voltage large-capacity scenarios.

Q:What optimizations has Vziman applied to the coils of HV oil-immersed power transformers?

A:Vziman adopts optimally designed coil winding structures developed through years of R&D. The conductor size is engineered to withstand allowable currents, temperature rises, and electromagnetic forces from external short circuits. Primary and secondary coils are concentrically arranged around the core, with insulation classification and mechanical strength fully considered.

Q:What materials and processes are used for the core of Vziman HV oil-immersed transformers?

A:The core is made of high-permeability magnetic silicon steel with no secular variations. Precision cutting minimizes no-load current and loss, reducing operational vibration and noise. Leg-yoke junctions undergo 45℃ precision processing (utilizing rolling directionality) and 800℃ annealing to eliminate magnetic properties.

Q:How is the tank of Vziman HV oil-immersed transformers designed for durability?

A:Constructed from cold-rolled steel, the tank resists internal pressure. It is engineered with enhanced mechanical strength to prevent deformation from external impacts during transportation or other scenarios.