According to the resistance formula of R= P *L/S (equivalent resistivity; P material equivalent length; L materials S materials equivalent sectional area) shows that by changing the P, L and S value can change the size of the insulation resistance.
We all know that air is a most common, reliable and inexpensive electrical insulating medium, insulation resistance and air gap is proportional to the size of it, but in a limited space of high voltage equipment, only the air gap is unable to meet the requirements of insulation resistance (because the equivalent length of air (L) is not enough, lead to R small).
While the high resistivity (P) of solid insulating materials, will be able to meet the requirements of high voltage equipment insulation resistance of limited space, but with different air insulation, solid insulation material is an unrecoverable insulating medium, the unfavorable factors in the electric field strength, heat and wet formed solid insulating material resistivity (P) to decrease the value of insulation resistance decreases called insulation aging. For example, a long time will cause a decline in insulation performance. How to meet the requirements of electrical insulation, the equipment and personnel will not be damaged.
EN 60664-1 (or GB/T16935) with the standard concept of insulation insulation coordination equipment within low-voltage systems, insulation coordination system refers to the electrical equipment is selected according to its use and the environmental conditions of the insulation, the clearance and creepage distance and solid insulation, is referred to as the insulation of electrical equipment.
It is known from EN 60664-1 (or GB/T16935) low voltage system that the insulation fit design can meet the requirements of the product can be verified by insulation resistance and electrical strength test. These two tests are carried out under high voltage (insulation: 500V DC, voltage: 2100V DC), the decision criteria are insulation impedance (R) and leakage current (I), which is based on the principle of Ohm's law U=I*R.
The difference between the two tests is that the insulation resistance measured by the insulation resistance test is the equivalent resistance value formed by the interconnection network between the two test points and the surrounding areas. However, the insulation resistance test cannot detect the following conditions:
(1) the insulation strength of insulation material is too weak;
(2) pinhole on insulator;
(3) the distance between parts is not enough;
(4) the insulator is crushed and broken;
The above conditions can only be detected by the electrical strength.
In the automotive industry standard EN 1987-3, ISO 6469-3, GB/T18384 also clearly require the product to meet the insulation resistance and electrical strength test requirements. each battery outgo our factory before delivery will be undertaken with proper isolation measures, including lithium ion battery shipping,using solar panels without batteries,lithium polymer battery charging,lithium ion battery voltage,lithium ion battery market,lithium ion battery capacity,lithium power,connect solar panel to battery,solar panel connection with battery,best deep cycle battery for solar power