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ASTM D149 Dielectric Strength Formula:
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ASTM D149 is the standard test method for dielectric breakdown voltage and dielectric strength of solid electrical insulating materials at commercial power frequencies. Dielectric strength is the maximum electric field that a material can withstand without breaking down.
The calculator uses the ASTM D149 formula:
Where:
Explanation: The dielectric strength represents the electric field intensity at which dielectric breakdown occurs, measured in volts per millimeter (V/mm).
Details: Dielectric strength testing is crucial for evaluating the electrical insulation properties of materials, ensuring safety and reliability in electrical applications, and compliance with industry standards.
Tips: Enter the breakdown voltage in volts and material thickness in millimeters. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is a typical dielectric strength value?
A: Typical values range from 10-100 V/mm for many insulating materials, with high-performance materials reaching 1000+ V/mm.
Q2: Why is thickness important in dielectric strength calculation?
A: Thickness directly affects the electric field intensity. Thinner materials generally show higher dielectric strength values due to reduced probability of defects.
Q3: What factors affect dielectric strength measurements?
A: Temperature, humidity, electrode configuration, voltage application rate, and material homogeneity can all affect test results.
Q4: How does ASTM D149 differ from other dielectric test methods?
A: ASTM D149 is specifically designed for power frequency testing (50/60 Hz) and provides standardized procedures for consistent results across different laboratories.
Q5: Can this calculator be used for all insulating materials?
A: Yes, the formula applies to all solid insulating materials, though specific test conditions and electrode configurations may vary based on material type.