ION9000 sag/swell module data

[Stuart_Cheng]

Hi All,

I am using ION9000 to capture voltage sag/swell. I configured the threshold to +/- 10% and linked the data to IEC61850 module for communication.

• I noticed something unusual: during a voltage sag, the DistVmin was recorded at only 90.61%, which is within the acceptable limit and should not have triggered the capture (please note that the value shown below is raw data minus 100% for easier understanding by the end-user). However, I also checked the ION9000 webpage and found that the voltage depth is 90%. I am curious about why the data is inconsistent?

• Another question from the same customer site, wondering why the DistVMax 89.83% was smaller than DistVMin 90.59, which also seems unusual according to the definition since DistVmin represents the minimum magnitude during the disturbance.

Appreciate it if anyone can provide any insight. Thanks

[Charles_Murison]

Hello @Stuart_Cheng ,

Are you able to connect to the meter with ION Setup?  Are you able to download the Sag/swell logs?
The web page will do some queries to the logs and some calculations, it is possible that the calculations are rounding or some other consideration.

With regards to the IEC61850, would need to understand what you have setup. If you are linking the outputs of the Sag/swell module directly to input of IEC61850 module and then taking a reading from those values, you might be showing the deltas between sag events and not the actual measured amount for the sag. 

Regards,

Charles

[Stuart_Cheng]

Hi @Charles_Murison 

Thanks for the reply. Do you mean the sag/swell data recorded in the data recorder? I will request my customer to provide it for analysis

Regarding communication, I connect the output register of the sag/swell module directly to the input of IEC61850 module without any further calculations. However, I am not entirely clear about the "deltas between sag events" you mentioned. Why using the IEC61850 module to collect data from the sag/swell module does not reflect the actual measured values? Does this mean that the data may vary depending on the communication protocols used, for example, ION versus IEC61850?

Also wondering if you have any idea about my second question. The DistVMax value is 89.83%, which is lower than the DistVMin value of 90.59%. This seems unusual based on definitions. DistVMin represents the minimum magnitude during the disturbance and should in theory be smaller than DistVMax?

Appreciate it if you could help elaborate more on these questions. Thank you

[Charles_Murison]

Hello @Stuart_Cheng ,

Yes the data recorder you are showing is exactly the data I am hoping to get. Hopefully with that data I can understand what is happening with DistVMax and DistVMin. The values in your screenshot from IEC61850 are negative values, I missed the statement that values were (reading - 100). The Sag/Swell module cannot give negative values so I had assumed that values were a delta between the current and previous reading. 

The data does not change depending on the protocol used to read the data (possibly some rounding/truncating occasionally).

Regards,

Charles

[Stuart_Cheng]

Hi @Charles_Murison 

I have attached the raw data for your reference. Upon comparison, I've noted that DistV2Max is the only value that differs (10.16 vs. 9.39). Interestingly, 9.39 corresponds exactly to the DistV2Max from the last disturbance on October 31, 2024. I am thinking whether it could be related to the deadband setting of the IEC61850 module, which may have caused the DistV2Max value to retain the previous reading?

From ION Setup

From Customer’s SCADA

 

If the issue is related to the deadband, what adjustments do you suggest? Can I directly change the value in the CID file to modify the deadband? Thank you.

[Charles_Murison · Accepted solution]

Hello @Stuart_Cheng ,

If you are using a dead band setting in IEC61850, then that could explain the behavior observed. Glad to see that the meter is reporting the sag data correctly in the logged data. Chances are you will want to have the IEC61850 report on any value change since the inputs are only updated at the end o each event.

Regards,

Charles

[Stuart_Cheng]

Thanks @Charles_Murison!