Ion 9000 is showing double the amount of VARs compared to other metering in the substation.

[sesa4025_bridge]

We have looked at the phasor diagram and can see what the meter is seeing.  Everything appears to be in phase.  The issue is that the Ion 9000 is showing double the amount of VARs compared to other metering in the substation.  I know this has been an issue before, I had found a thread online discussing this very issue where they had to add a “triangulation module” to change the way the meter calculated the data.  Are you familiar with that at all?  It appears we are experiencing that same problem, and I am assuming it has to do with the CT circuits being wired in a delta configuration.

 I have an ION 9000 power quality meter at my company’s Park Substation location. We have noticed that the meter is reading VARS and Watts incorrectly compared to our Bitronics meters. We think the magnitude of the voltage
and current being read by the meter is correct, as the total VA match the Bitronics. For example, right now it is reading Vll avg of 12, 646 V, an I average of 478 A, a Vln average of 7,305 V, 6,734 kW, 8,134 kVARs, and 10,341 kVA. Our Bitronics are currently
reading 9.9 MW, 3.7 MVARs, and an I average of 485 A (These were all instantaneous values that are bouncing around a bit as I read them). We think the problem may be that the CTs for the meter are wired in delta, and we have not found an option in the configuration
to specify this. Since the CTs are wired in delta to get the current magnitude of 478 A we set the CT’s primary value to 692.82 which is 1200 / √3. The PTs are in wye, and there is a setting in the configuration to specify this. It appears if we could offset
each phase’s current by +30 degrees it would fix our problem. Is there a way to do this? Or, is there another solution to our problem?

[Charles_Murison · Accepted solution]

Hello @sesa4025_bridge 

Do you have a  wiring diagram of how the meter is connected to the system? 

I will start by saying I am a bit confused. The screenshot is from a meter that is not ION9000 based on the serial number. The values for voltage and current do not match your description.

When ION meters are showing kW that does not meet expectations when voltage and current magnitudes are at expected values, the most common issue is incorrect wiring. 

Also I am confused what you mean with changing the CT primary value. The setting on the meter should be matching the physical CT.

Regards,

Charles