From handheld testers to high voltage diagnostic units, our insulation testing range covers every application. We help you identify deterioration early, preventing costly downtime and ensuring your electrical infrastructure operates at peak performance.
Our equipment exceeds the strictest global protection standards. By identifying dangerous faults before they escalate, we help you maintain a secure environment for your operators and safeguard your critical electrical network from catastrophic failure.
Engineered for durability, our testers deliver precise results regardless of harsh conditions or electrical noise. You can trust our instruments to provide the repeatable accuracy needed for long-term tracking of insulation integrity across your fleet.
Move beyond simple pass/fail results. Our advanced diagnostics reveal the true condition of your insulation, allowing you to predict potential issues, prioritise maintenance schedules, and manage the lifecycle of your assets with total confidence.
Insulation resistance testing checks the condition of electrical insulation within assets such as transformers, motors, cables, switchgear, and generators. By applying a controlled DC voltage, the test identifies deterioration caused by moisture, contamination, thermal aging, or mechanical damage. This helps maintenance teams detect early signs of degradation and prevent unexpected failures or costly downtime.
The right insulation tester depends on the voltage level you need to apply and whether you require diagnostic data for trending. If your work involves large, high-value assets or tests performed in EHV yards, the S1 series is typically the most suitable choice.
Insulation is affected by its environment and operating conditions. Temperature, moisture, contamination, vibration, and general aging all contribute to changes in insulation resistance. Over time, these factors can reduce resistance and indicate weakening insulation. Conducting insulation tests regularly and comparing results over time allows maintenance teams to identify developing issues early and plan corrective action before failures occur.
The Polarisation Index (PI) compares insulation resistance measured at 1 minute and 10 minutes of test duration. A rising resistance value over time indicates healthy insulation, while a low or unstable PI can indicate moisture, contamination, or insulation breakdown. Megger’s PI Predictor™ feature helps technicians estimate the final PI value early in the test, saving time during routine or outage-critical testing.
From compact handheld testers to advanced 15 kV systems, Megger offers insulation testing solutions for every environment and asset type. Compare features, explore specifications, and find the right model for your needs.
Take a deeper dive into electrical insulation testing solutions through our comprehensive guides.
