isolatsioonitestijaga

An isolatsioonitestija, also known as an insulation tester or megohmmeter, is an electrical instrument used to measure electrical resistance, specifically very high resistance values. Its primary purpose is to test the integrity of electrical insulation. This is crucial for ensuring the safety and reliability of electrical equipment and systems. High resistance indicates good insulation, while low resistance suggests a potential breakdown or defect in the insulation.

Isolatsioonitestijad work by applying a high-voltage DC potential to the insulation being tested and then measuring the resulting current. The tester then calculates the resistance using Ohm's Law (R = V/I). The high voltage is used to overcome the inherent high resistance of good insulation and to reveal any weaknesses that might not be apparent at lower voltages. Different models offer various test voltages, typically ranging from 50 volts to 5 kilovolts or higher, depending on the application.

Common applications for isolatsioonitestijad include testing the insulation of electric motors, generators, transformers, cables, switches, and other electrical components. Regular insulation testing helps to detect potential problems like moisture ingress, contamination, physical damage, or aging insulation before they lead to short circuits, equipment failure, or dangerous electrical hazards. The results of these tests are often compared to manufacturer specifications or industry standards to determine the condition of the insulation.