The purpose of insulation resistance testing is to evaluate the insulation performance of equipment or materials, ensuring that they can safely and effectively isolate current, prevent faults such as leakage and short circuits in electrical equipment and circuits, and ensure the normal operation of electrical systems and personal safety.

Specifically, the main purposes of insulation resistance testing include:

1. Safety assessment: Insulation resistance is an important indicator of electrical safety. By testing the insulation resistance, it is possible to determine whether the insulation performance of equipment or materials is good, whether there are safety hazards such as leakage and breakdown, and take corresponding measures for repair or replacement to ensure the safe operation of electrical equipment and circuits.

2. Performance evaluation: Insulation resistance also reflects the electrical performance of equipment or materials. By testing insulation resistance, one can understand whether the electrical performance of equipment or materials meets the requirements and whether they can meet specific working environments and requirements. This helps in selecting appropriate equipment or materials and ensuring their optimal performance in practical applications.

3. Preventive maintenance: Insulation resistance testing can be part of preventive maintenance. Regularly conducting insulation resistance tests on electrical equipment and circuits can promptly identify potential insulation issues, take measures to repair them in advance, and avoid electrical failures and accidents caused by insulation failure.

4. Fault diagnosis: When electrical equipment and circuits malfunction, insulation resistance testing can help diagnose the cause of the fault. By testing the insulation resistance of different parts, the fault point can be located, providing important basis for fault repair.

In short, insulation resistance testing is an indispensable task in electrical safety, equipment maintenance, and fault diagnosis. It helps to evaluate the insulation performance of equipment or materials, ensure the safe operation of electrical systems, and improve the reliability and service life of equipment.