2024.7.10
Articles
The safe distance for high-frequency transformers refers to the design distance between internal and external structures. It includes electrical clearances, creepage distances, and insulation penetration distances to ensure proper insulation and isolation, thereby avoiding safety risks such as electric shock, discharge, or breakdown.
Common IEC (International Electrotechnical Commission) standards establish safety distance requirements between primary circuits to secondary circuits, primary circuits to the core, and secondary circuits to the core in high-frequency transformers. When designing and manufacturing high-frequency transformers, it's necessary to refer to applicable safety standards and specifications to determine appropriate safety distance requirements. These requirements may involve electrical clearances, creepage distances, and the selection of insulation materials.
• Electrical Clearance :
Electrical clearance refers to the shortest distance between two conductors. It directly measures the physical distance between two conductors and is typically used to ensure that no discharge or breakdown occurs between the conductors under a given voltage. Electrical clearance is usually achieved through air or other insulation mediums.
• Creepage Distance :
Creepage distance refers to the shortest distance measured along the surface of insulation between two adjacent conductors. It represents the actual distance along a curved, curved, or straight path on the insulation surface.
Due to polarization of the insulation material surrounding the conductors, it prevents electrical arcing, breakdown, and other electrical faults. It is designed to prevent current from creeping on the insulation surface. The size of creepage distance depends on the characteristics of the insulation material and the requirements of safety standards and specifications.
• Insulation Penetration Distance :
The insulation penetration distance refers to the distance at which insulation material extends between two conductor components. It provides additional insulation protection to prevent electrical faults and discharges. For working voltages not exceeding 50V, the requirements for insulation penetration distance depend on the type of insulation.
There are no specific thickness requirements for primary insulation.
For additional insulation, as well as reinforced insulation that needs to withstand mechanical stress, the minimum thickness should be more than 0.4 mm.
Transformer Safety Clearance Diagram