jännitekestävyyttä

Jännitekestävyyttä, known in English as dielectric strength, refers to the maximum electric field strength that a material can withstand without breaking down electrically. This breakdown is characterized by the material losing its insulating properties and becoming conductive, often leading to a current flow. The unit of electrical field strength is typically volts per meter (V/m) or kilovolts per millimeter (kV/mm).

Different materials possess varying levels of jännitekestävyyttä. For instance, insulators like ceramics, glass, and certain plastics have high dielectric strengths, making them suitable for applications where electrical insulation is critical, such as in power lines, electrical components, and high-voltage equipment. Conversely, materials with low jännitekestävyyttä are more prone to electrical breakdown.

The jännitekestävyyttä of a material is influenced by several factors, including temperature, humidity, the presence of impurities, and the duration of voltage application. It is a crucial parameter in the design and safety considerations of electrical systems. Testing of jännitekestävyyttä is performed to ensure that materials meet the required insulation standards for their intended use. This property is fundamental in preventing electrical faults, short circuits, and ensuring the reliable operation of electrical devices.