ION9000 Power Factor difference

[mauricio_rojas_]

Hello everybody

Im looking for some guidance about an ION9000. The client has installed the meter in a LV system (3-Wire Grounded Wye) with a common current transformer with a sentronpac 3200. 

 1. For power Factor, there are a big difference about the total factor (0.96 for ION9000 and 0.75 for sentronpac). We put a portatil meter (Fluke 435) and the Fluke reads also 0.75.  Is there any problem for the Total Power Factor in ION9000?  About the Current readings, the two meters have the same values.

2. About the ION9000 installation manual, we see that for 3-Wire Grounded Wye, there is only a MV graphic like below:

In order to correct the problem. How do we have to wire the meter  and its possible to fix the error in the total power factor reading?

Thanks in advance

[Charles_Murison]

Hello @mauricio_rojas_ ,

Looking at the data provided I am surprised to see the total PF so different from the individual phases. Where are you reading these numbers, software, web pages front panel? What are the readings for kw and kVA per phase and total? What is the kVA calculation method?

Regards,

Charles

[DanL · Accepted solution]

Issue 1: The LV system is described as a 3-wire grounded WYE. Let's assume that PTs are not used and the voltage wired to the meter is <690VLL. The best correct wiring and VOLTS mode to use would be the direct connect 4W-WYE where the meter's VN measuring terminal is connected to the common ground point of the power system.

Issue 2: The "Total Power Factor" on all ION meters is the ratio of the "Total kW" and the "Total kVA". Most likely they have the default configured "kVA Tot Method" = "Vector sum". The other device is likely implementing the equivalent of "Scalar Sum".

A large discrepancy is typical with non-linear loads or distorted signals.
IONReference\PowerMeterModule