Dielectric breakdown voltage

The dielectric breakdown voltage of a dielectric material, which is sometimes shortened to breakdown voltage, is the maximum value of the potential difference that the material can sustain without losing its insulating properties and before sparking appears (i.e., dielectric failure). It is commonly symbolized by and expressed in volts (V). However, the breakdown voltage is a quantity that depends on the thickness of the insulator and hence is not an intrinsic property that describes the material. Therefore, it is preferable to use the dielectric field strength. 

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ASTM D149, Test Methodsfor Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies, Vol. 8.01, ASTM, Philadelphia, Pa., 1987. 

The dielectric breakdown voltage or dielectric strength of polymers may be determined by ASTM-D149. The dielectric breakdown voltage is the maximum applied voltage that a polymer can withstand for 1 min divided by the thickness of the polymer. 

ASTM D149, 97 (2004). Standard test method for dielectric breakdown voltage and dielectric strength of electrical insulating materials at commercial power frequencies. 

Polymeric materials usually have low dielectric breakdown voltages. Fortunately, the electrical insulation property of PDMS is sufficient (R > 1015 O/cm) [159]. Moreover, the use of a lower electric field ( 1100 V/cm) helps alleviate this... 

According to the data obtained by Domkin the value of dielectric breakdown voltage Ebr is primarily determined by the dielectric strength of the gas in the cells and is independent of the foam density at least up to 7 = 600 kg/m (Fig. 20). 

Figure IV gives the general properties of the new water based resin ED24574. The key properties to note are the electric properties. Specifically, the dielectric breakdown voltage is a safe margin above the minimum requirements. The remainder of the electrical properties are also well above the requirements.

Several tests are essential for the evaluation of plastics in electrical applications. These tests include dielectric constant (permittivity ASTM-D150-74), which is the ratio of the capacitance of the polymer compared to air, dielectric strength, and dielectric breakdown voltage (ASTM-D149-75). Dielectric breakdown voltage is... 

Electrical Communications Low dielectric constant High volume/surface resistivity High dielectric breakdown voltage Flame resistance, thermal stability Wire and cable insulation, connectors... 

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