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How to fix inaccurate current readings

2016-11-15View Original

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What are the reasons for inaccurate current readings at the motor operation site and how to resolve them?
Reply #22016-11-15
Generally, inaccurate current readings are caused by a large distance between the transformer and the ammeter. Solutions: 1. Replace both the original /5 ammeter and transformer with /1 ammeters and transformers; this method can ensure accurate current readings, as the distance is theoretically increased by 25 times; 2. Replace the transformer with one that has a higher output capacity; for example, if it was originally 10 VA, it can now be changed to 20 VA or even more. This method allows the current value to be displayed accurately, with the theoretical increase being twice as much ; 3. Thicken the wire; for example, change it from 1.5 to 2.5. This method allows the current distance to be displayed correctly, with an increase of 1.67 times in theory ; 4. Add a current transmitter on the transformer side to output a 4-20mA signal, and replace the ammeter with one that accepts 4-20mA input; this method theoretically works fine over distances of several kilometers or even more.

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