How often should you do insulation tests?

That depends upon the size, complexity, and criticality of your equipment. Even identical units can differ in the required check periods; experience is your best guide. In general, however, working apparatus – such as motors and generators – are more likely to develop insulation weaknesses than wiring, insulators, and the like. A test schedule for working equipment should be established, varying from every 6 to 12 months, depending on the size of the equipment and the severity of the surrounding atmospheric conditions. For wiring and the like, tests once a year are generally sufficient unless the installation conditions are unusually severe.

Does the CAT rating matter for an insulation test, as it's designed to be used only for dead circuit testing?

The answer, at least in part, is in the question! An insulation resistance tester is designed to be used only on dead circuits, but that’s no guarantee that it won’t ever be accidentally connected to a live circuit. And if it is, an appropriate CAT rating is essential, especially as the environments in which HV insulation testers are most frequently used often have high supply transients. We recommend a CAT IV 600 V rating, and it’s imperative to be sure that this rating applies to all of the instrument’s terminals, including the guard terminal.

Why choose an insulation test that offers a high output current as a preference to one with a lower output current?

There are several reasons to select a test set with a high output current. Possibly the most important is that a high output current means that the item under test will be charged more quickly, which means that the test can be completed in a shorter time and also that there’s less risk that the readings will be taken before the test voltage has had time to stabilise properly. And, if you’re using the instrument’s guard terminal, don’t forget that a lot of output current may well be diverted via the surface leakage of the item under test. Unless the instrument has a high output current capability, this could mean that the output voltage will collapse, and the test results will not be valid.

Which DC insulation tester do I need?

First, decide on the type of testing you need to perform. If it’s routine go/no-go testing and you don’t need data storage, an Essential instrument (MIT515) will likely be a cost-effective choice. Consider an Advanced instrument (MIT525, MIT1025, MIT1525) for more versatility and/or internal data storage. And if working in extremely electrically noisy environments or need high charge/burn currents, an Expert instrument (S1-568, S1-1068, S1-1568) will be right. Having decided on Essential, Advanced or Expert, choose the instrument that will deliver the maximum test voltage needed.

Soluzioni di test di isolamento elettrico

Sicurezza senza compromessi:

Progettati per resistere agli ambienti e alle condizioni più difficili, i nostri tester di resistenza di isolamento sono progettati per garantire la protezione degli utenti e delle apparecchiature.

Precisione dove conta:

Misurare con precisione. Ottenere risultati affidabili. Ripetere. I tester di isolamento Megger mantengono la precisione fino ai valori di resistenza elevati richiesti da molte applicazioni.

Affidabilità su cui poter contare:

Le nostre soluzioni di test di isolamento elettrico soddisfano le normative e i requisiti e superano le tue aspettative. Sempre pronto a testare, potrai beneficiare di una maggiore durata dei prodotti, con conseguente miglioramento del ROI del tuo programma di gestione delle risorse. Ma, soprattutto, sai che i nostri prodotti funzionano quando e dove ne hai bisogno.

Un partner di fiducia:

L'analisi dei trend è efficace solo quando i test vengono eseguiti correttamente e i dati sono accurati. Gli strumenti di Megger offrono la precisione necessaria per prevedere e gestire il degrado delle risorse. Sfrutta i nostri oltre 130 anni di competenze e conoscenze, acquisite lavorando in tutti i comparti

del settore dell'energia elettrica in tutto il mondo: questo ti aiuterà a condurre i test e ad analizzare i risultati nel modo corretto.