Tester della resistenza dell'isolamento da 5 kV BM5200
Le modalità di isolamento (InS), indice di polarizzazione (PI) e test temporizzato variabile (t) sono disponibili in qualsiasi gamma di test IR
Include indicatore di avviso di alta tensione, visualizzazione della tensione esterna dopo test IR, scarica automatica dei carichi reattivi e cavi per test
Consente di ottenere risultati accurati durante l'esecuzione di test su elementi con dispersione superficiale significativa
Cinque intervalli di test a 250 V, 500 V, 1000 V, 2500 V e 5000 V che coprono un intervallo di misurazione da 100 kΩ a 1000 GΩ
Informazioni sul prodotto
Il tester della resistenza dell'isolamento da 5 kV BM5200 è stato progettato per il test di resistenza dell'isolamento ad alta tensione nella manutenzione e interventi sui cavi, macchinari per impianti rotanti, trasformatori, quadri elettrici e applicazioni industriali.
Il modello BM5200 consente di eseguire test dell'isolamento CC a 250 V, 500 V, 1000 V, 2500 V e 5000 V. L'intervallo di misurazione della resistenza d'isolamento è compreso tra 100 kΩ e 1000 GΩ. Inoltre, fornisce una scarica automatica per i circuiti capacitivi sottoposti a test e visualizza la tensione di decadimento.
Lo strumento non solo è alimentato a batteria, ma è dotato anche di uno schermo che utilizza l'arco digitale e analogico. Inoltre, utilizza un terminale di protezione per aumentare la precisione dei risultati riducendo al minimo gli effetti della dispersione superficiale che possono causare errori di misurazione.
Specifiche tecniche
- Memorizzazione dei dati e comunicazione
- Nessuna
- Tensione in uscita massima (CC)
- 5 kV
- Lettura massima della resistenza
- 1TΩ
- Fonte di alimentazione
- Batteria
Ulteriori letture e webinar
Prodotti correlati
Risoluzione dei problemi
This symbol indicates that the instrument has experienced an overcurrent causing the fuse to blow. The fuse is in the battery compartment; you can replace it with the spare fuse.
A broken standoff between the display and control board will cause zero voltage output on all ranges. Such a break is usually caused by rough handling. You will need to send the instrument for repair in such a case.
Interpretazione dei risultati del test
Insulation resistance readings should be considered relative. They can be quite different for one motor or machine tested three days in a row, yet it does not mean bad insulation. What matters is the trend in readings over a longer period, showing lessening resistance and warning of coming problems. Periodic testing is, therefore, your best approach to preventive maintenance of electrical equipment, using record cards or software to trend the results over time.
Whether you test monthly, twice a year, or annually depends upon the equipment's type, location, and importance. For example, a small pump motor or a short control cable may be vital to a process in your plant. Experience is the best teacher in setting up the scheduled periods for your equipment.
We recommend making these periodic tests in the same way each time. That is, with the same test connections and test voltage applied for the same length of time. Additionally, we recommend performing tests at about the same temperature or correcting them to the same reference temperature. A record of the relative humidity near the equipment during the test is also helpful in evaluating the reading and trend.
In summary, here are some general observations about how you can interpret periodic insulation resistance tests and what you should do with the result:
| Condition | What to do |
|---|---|
| Fair to high values and well maintained | No cause for concern |
| Fair to high values but showing a constant tendency towards lower values | Locate and remedy the cause and check the downward trend |
| Low but well-maintained values | Condition is probably acceptable, but you should investigate the cause of low values |
| So low as to be unsafe | Clean, dry out, or otherwise recondition the insulation to acceptable values before placing equipment back in service (test wet equipment after drying out) |
| Fair or high values, previously well-maintained but showing a sudden decrease | Make tests at frequent intervals until you locate and remedy the cause of low values; or until the values have become steady at a lower level but safe for operation |
The resistance of insulating materials decreases markedly with an increase in temperature. However, we’ve seen that tests by the time-resistance and step-voltage methods are relatively independent of temperature effects, giving relative values.
To make reliable comparisons between readings, you should correct the measurements to a base temperature, such as 20 °C, or take all your readings at approximately the same temperature.
A good rule of thumb is: For every 10 °C increase in temperature, halve the resistance; or, for every 10 °C decrease, double the resistance.
Each type of insulating material will have a distinct degree of resistance change with temperature. Factors have been developed, however, to simplify the correction of resistance values. Please refer to the document linked below to find such factors for rotating equipment, transformers, and cable (Section: Effect of Temperature on Insulation Resistance).