How to choose a megger insulation resistance tester

When purchasing a water cooling meter (insulation resistance tester for water cooled generators), there are two main points to note: First, the method of cooling the generator must be cooled by water rather than air. . This instrument is only suitable for water cooling type generator; second, select the voltage level and range. There are three main types of water jerk meters (insulation resistance testers for water-cooled generators) in the market based on voltage level: 2500V/10G, 5000V/20G and 2500 V/5000 V/20 G. They vary depending on the voltage level. and generator capacity. Make your selection. Third: Second, choose instruments that can automatically compensate and eliminate the impact of water polarization potential on measurement results. Automatically measure R15, R60 and R600 and calculateAutomatically set the absorption rate and polarization index. The test voltage is negative high voltage 2500V, and the charging capacity of 5000V is strong. When the resistance (water resistance) between the winding and the water collection pipe is as low as 70kΩ, the test voltage drops <10%. The measuring range is 0-20GΩ, and the range is automatically switched. It can automatically compensate and eliminate the influence of water polarization potential on test results. When the resistance between the water collection pipe and the machine base is as low as 3kΩ, the measurement accuracy can still be guaranteed.