Grade Categories and Insulation Thickness

The document categorizes insulation thicknesses in micrometers (μm) into four grades labeled A to D. Each grade corresponds to a specific range of insulation thickness values:

• Grade A: >150 μm to >16000 μm to >20000 μm
• Grade B: 120-150 μm to >13000 μm to >18000 μm
• Grade C: 90-120 μm to >11000 μm to >15000 μm
• Grade D: 60-90 μm to >8000 μm to >13000 μm

BDV and PDIV Voltage Ratings

For each grade, two voltage ratings are specified:

• BDV (Breakdown Voltage): Given in volts (V), indicating the maximum voltage the insulation can withstand before failure.
• PDIV (Partial Discharge Inception Voltage): Given in volts peak (Vp), indicating the voltage at which partial discharges begin within the insulation.

Thickness and Voltage Relationship

The document provides ranges for thickness and corresponding voltage ratings, suggesting a direct relationship between insulation thickness and voltage withstand capability. Thicker insulation corresponds to higher BDV and PDIV values.

Recommended Ratios and Application Areas

• Ratio of Width to Thickness: For long side thicknesses, the recommended ratio is between 1:1 and 1:4.
• Thickness Ranges: For short side thicknesses, the recommended range is 0.7 to 3.6 (units not explicitly stated but likely mm or μm).
• Radius (Corner) Range: Specified as less than 0.6 (range 0.2 to 0.4), likely referring to the radius of curvature at corners to avoid stress concentration.

Application Areas and Technology

The document mentions new energy vehicles, drive motors, industrial motors, aerospace, wind power, and rail transit as application areas, indicating the relevance of these insulation specifications in high-performance electrical and electromechanical systems.

Summary

This technical document outlines insulation thickness grades with corresponding electrical voltage ratings, emphasizing the importance of thickness in achieving desired breakdown and partial discharge voltages. It also provides design recommendations for dimensional ratios and corner radii to optimize insulation performance. The specified parameters are critical for applications in advanced motor and energy systems.