Have you notice distorted values display on PM meters?

[Emilie_Ernwein]

Schneider electric PMxxxx and their efficient running rely largely on the connected Current Transformers, their installation and their calibration.

CTs are sensors sending electrical signal to the PMxxxx which then perform the calculation of your power quality and the subsequent value display.

Consequently, whether your CTs are not properly connected or calibrated, harmonics may be polluted, and value distortion could then be observed on your PMxxxx display.

But how can we prevent these disfunctions?

First of all, the CTs should be chosen according to wires and PMxxxx specification:

• PM input current
• PM accuracy class
• Cable size and load
• Voltage connection
• Space between current transformers

Also note that common failure causes through the installation could be:

• CTs connection to the PMxxxx
• PMxxxx calibration
• Degradation of the CTs*

Our range of Current Transformers:

Schneider Electric offers a large range of Current Transformers fully compatible with Schneider Electrics and Third-Party measurement devices. Our range is divided in two collection:

• Solid core current transformers, perfect for new installation
• Split core current transformers, perfect for retrofit

Discover more about our CTs and their features

Solid core CTs                             Split core CTs

*With time, CTs can deteriorate and engender accuracy variability. All CTs are not equal in durability