1, Definition of dielectric strength and breakdown voltage
Dielectric strength refers to the maximum electric field strength that the tested material can withstand between two materials that are electrically isolated under the action of an electric field. That is to say, under this electric field strength, the material will not exhibit any damage or breakdown phenomenon. Generally speaking, the unit of dielectric strength is V/mm.
The breakdown voltage refers to the voltage at which a material experiences breakdown when the electric field strength reaches a certain value. The breakdown here refers to the sudden increase in current, causing irreparable damage to the material. The breakdown voltage is an important indicator for measuring the durability of electrical insulation materials, and is usually measured using three methods: DC breakdown, AC breakdown, and shock wave breakdown.
2, The difference between dielectric strength and breakdown voltage
From the definition and measurement methods, the difference between dielectric strength and breakdown voltage can be summarized as the following three points:
1. Different physical meanings: Dielectric strength emphasizes the electric field strength that electrical materials can withstand, that is, the insulation performance of the dielectric; The breakdown voltage refers to the voltage value at which electrical materials experience breakdown under a certain electric field strength.
2. Different measurement methods: The measurement of dielectric strength needs to be obtained by causing dielectric breakdown under different electric field strengths; The breakdown voltage is obtained by measuring the maximum voltage that different dielectrics can withstand under the same electric field strength.
3. Different units: The unit of dielectric strength is V/mm, while the unit of breakdown voltage is V.
In summary, dielectric strength and breakdown voltage are both important indicators for testing the electrical properties of electrical materials, but their physical meanings and measurement methods are different, and they need to be selected according to specific testing requirements. In practical applications, we can appropriately combine the test results of both to verify the integrity and reliability of electrical materials.