High-performance EI28 Low-frequency Transformer Unit

The "standard configuration" of professional maintenance vehicles       The nominal inductance between pins 1 and 5 is 25mH±15%, measured under a standard test condition of 1kHz and 1V. The product uses vacuum impregnation and meets Class B insulation requirements. The winding-to-core insulation is tested at AC1500V, 5mA for 3 seconds. 1. Inductance performance The inductance is measured between pins 1 and 5 and specified as 25mH±15%. The standard test condition is 1kHz and 1V, using a 3259 comprehensive tester or an equivalent instrument. 2. Dielectric strength The winding-to-core insulation is tested at AC1500V with a test current of 5mA for 3 seconds. 3. Vacuum impregnation The product uses vacuum impregnation to support coil fixation and insulation-structure stability. Final process acceptance shall follow the mutually confirmed product specification. 4. Insulation class The product is specified as Class B insulation. For equipment with specific temperature, insulation-system or sa…