How to distinguish insulation board insulation is good or bad?

insulation transformer pressboard, also known as epoxy resin insulation board, he is a relatively common insulating rubber products, it has a good insulation properties, how to identify the insulation board insulation performance?
1, breakdown voltage: breakdown voltage level is usually used to determine the insulation properties of rubber insulation products, an important standard, is an indispensable technical parameters. Each designer in the design of the time to pay attention to the breakdown of the voltage problem, this is not only the impact of insulation performance, but also insulation board product safety and the use of an important standard of stability.
2, the dielectric constant The dielectric constant of the word is more professional, it is a measure of the conductivity of a parameter, the greater the dielectric constant of the same conditions under the conditions of the current will be more, the corresponding insulation of this material The worse the performance. Therefore, in order to ensure that the insulation plate can have good insulation, to maintain its dielectric constant to a certain extent is very important.
3, resistance: This is used to determine the insulating plate electrical insulating board performance of one of the main indicators, insulation board insulation performance also need to identify it through. For the insulation product volume is strictly defined, according to the different needs of use, have different volume standards. In general, the larger the volume resistance, the greater the resistance of the surface.