Transformer testers are not composed of a single material, but rather a combination of various high-performance materials based on their internal structure and functional requirements. The choice of materials for their core components directly affects testing accuracy, safety, and durability.
Core Material: The core of high-voltage test transformers typically uses silicon steel sheets due to their high permeability and low iron loss, which effectively reduces energy loss, ensures magnetic field stability, and avoids fluctuations in test data. High-quality cold-rolled silicon steel sheets are the mainstream choice, while some high-performance equipment may use amorphous alloys to further reduce losses.
Winding Material: The winding material may be copper or aluminum. Some testers may use aluminum windings to control costs, but copper windings have superior conductivity and lower resistance losses. This can be determined through non-destructive testing using a dedicated transformer material analyzer (such as FLDCZ-X, ZX-BC188A, etc.). High-end instruments tend to use high-purity copper windings to ensure long-term stability.
Housing Materials: The housing is primarily used for protection and electromagnetic shielding. Common materials include:
Steel Plate Coating: High mechanical strength, corrosion resistant, suitable for both indoor and outdoor environments.
Stainless Steel: Highly corrosion resistant, suitable for humid or corrosive environments.
Aluminum Alloy: Lightweight and provides good heat dissipation, commonly used in portable devices. Protection ratings are typically between IP20 and IP33, ensuring dust and water resistance.
Insulation and Heat Dissipation Materials: High-performance insulating materials such as transformer oil or epoxy resin are used internally for electrical isolation and heat dissipation. Transformer oil must have a high breakdown voltage and a low dielectric loss factor to ensure safe operation.
