Insulation resistance is the most basic insulation indicator for electrical equipment and electrical lines. For the handover test of low-voltage electrical installations, the insulation resistance of motors, distribution equipment, and distribution lines at room temperature should not be less than 0.5MΩ (for equipment and lines in operation, the insulation resistance should not be less than 1MΩ/kV).
Correct measurement method of insulation resistance. Modern life is changing with each passing day, and people cannot do without electricity for a moment. In the process of using electricity, there are electrical safety issues. In electrical equipment, such as motors, cables, household appliances, etc.
Extended information
Influencing factors
Environmental temperature and humidity
Generally, the insulation resistance value of materials decreases with the increase of environmental temperature and humidity. Relatively speaking, surface resistance (resistivity) is more sensitive to environmental humidity, while volume resistance (resistivity) is more sensitive to temperature.
As humidity increases, surface leakage increases, and the conductor conduction current also increases. As temperature rises, the movement speed of carriers accelerates, and the absorption current and conduction current of dielectric materials will increase accordingly. According to relevant data reports, the resistance value of general media at 70°C is only 10% of that at 20°C. Therefore, when measuring insulation resistance, it is necessary to specify the temperature and humidity at which the sample and the environment reach equilibrium.
