isolasjonstester

Isolasjonstester, also known as insulation testers or megohmmeters, are specialized electrical instruments used to measure electrical resistance, specifically the resistance of an electrical insulator. They are designed to apply a high voltage, typically 50V, 100V, 250V, 500V, or 1000V, to the insulation being tested and measure the resulting current flow. A higher resistance indicates good insulation, while a low resistance suggests a potential fault or degradation of the insulating material.

These testers are crucial for ensuring electrical safety and the reliability of electrical equipment. By performing insulation resistance tests, electricians and technicians can detect problems such as moisture ingress, contamination, physical damage, or aging insulation that could lead to short circuits, electric shocks, or equipment failure. The tests are commonly performed on motors, transformers, cables, switchgear, and other electrical systems.

When conducting an insulation resistance test, the tester is connected between a live conductor and a grounded object or between two conductors. The applied high voltage forces any leakage current to flow through the insulation. The instrument then calculates and displays the insulation resistance, often in megaohms (MΩ) or gigaohms (GΩ). Different standards and regulations specify minimum acceptable insulation resistance values for various types of equipment and applications. Regular testing and adherence to these standards are essential for maintaining safe and efficient electrical installations.