Custom calculations with ION7650

[Sven_Ortmann]

Hi,

a customer wants a few custom calculations logged in SQL database:

1) is the Urms automatically calculated in ION7650? if yes, were do i finde the value.

if not how can i calculate it?

Is this the right formular?

2) were do i find Plt (Power-line flicker) and Pst this should be stored every 2 hours. (12 Pst values)

thx for help

[sesa256952]

You will likely need to do a bit of programming.

For programming ION meters I like to use designer in PME. It is also mandatory to have an ION reference on hand (unless you have an incredible memory)

To accomplish what you wish to do, at a minimum, you would need an arithmetic module and a data recorder module.

The arithmetic module allows you to perform the calculations and the data recorder module allows you to store and log the results.

I know it's not everything but I suspect you can work out the rest..

.

[jimbradley]

Hi Sven,

Could you define the what the labels are in your equation. 

It "looks" like the "power triangle" equation for Active (real) Energy ie kW = Sqrt(kVA ^2 - kVAR^2). 

Plt and Pst are recorded IF you have the PQ framework in the 7650.  The data is stored when the Flicker module finishes a Pst (10 minutes) or Plt (120 minutes) calculation. 

These are measurements/labels recorded.

Source - FLK1 Phase 1 Pst (V1-Flck Pst)

Source - FLK1 Phase 2 Pst (V2-Flck Pst)

Source - FLK1 Phase 3 Pst (V3-Flck Pst)

Source - FLK1 Phase 1 Plt (V1-Flck Plt)

Source - FLK1 Phase 2 Plt (V2-Flck Plt)

Source - FLK1 Phase 3 Plt (V3-Flck Plt)

Note that the Plt values are analysed in the meter into "bins" with the Signal Limit Evaluation modules which are also recorded and the bin statistical values are used in the standard PME reports.

Jim

[Sven_Ortmann]

Hi Jim,

i don't know exactly because the customer only says he wants a calculation of U rms and I rms.

I found the formula on the internet. I dont know if its the right one for the calculation. 

thank you

[dborle]

Hi Sven,

After the ION7550/7650 user guide the calculated voltage is the RMS voltage:

Best Regards

Daniel

[Sven_Ortmann]

Hi Daniel,

do you know how these values are exactly named in the ION Device?

And are they stored with Data Recorder?

The customer wants AVG/MIN/MAX in 10 Min Interval stored.

thank you

[dborle]

Sven,

Those values are logged on the device per default:

I had a look on a device in our office and there is a 15 min interval defined. I guess that this is the default interval. In this case you will have to change the logging interval to 10 min.

One remark: The RMS values are logged as mean values, what means, that this is something like a demand value (integration over a certain period -> 15 minutes; should also be changed if you like to log on 10 min interval)

[Sven_Ortmann]

Hi Daniel,

yes this should all be changed to 10 min interval. Were do i find the Timer or Periodic 15 min trigger for

This should all be stored in SQL Databse:

15 Min interval:

P,Q,S, PF, cosPhi

10 Min interval:

1) U rms, Irms AVG/MAX/MIN

2) THD U, THD I, Unbalance AVG/MIN/MAX

3) Flicker: Pst in 10Min and Plt in 2h interval

4) Harmonics until 50th, voltage and power

5) Frequency: AVG/MAX/MIN

Other changes and triggers:

- Deviation of voltage +-10%, Stop at +-8%

- Change of U +-5%

- deviation of sinus pretime 1sec + posttime 3 sec

[dborle]

Hi Sven,

I will send you the answer over Email - it's easier.

Daniel

[Aminadra]

Hello Sven

Check this link. In it you will have the default logged values, also there is a section for the RMS values

http://www.powerlogic.com/literature/7550-7650_User_Guide_70002-0248-07.pdf

[Sven_Ortmann]

Hi Amine,

there is only V1-3 RMS but no I RMS?

and this is stored every 3sec?

[dborle]

Hi Amine,

Yes, you are correct, but there are only RMS values for voltage in 40-30 and not for I.

[sesa56307_bridg]

The section of the user guide that Amine shows here describes the 4-30 data logs that are in the meter's default configuration.  There are three different data logs for 3 second values, 10 minute values, and 2 hour values.  Each of those three logs contains most of the 4-30 parameters listed in the right column (voltage disturbances and flicker are actually stored in other logs).  So there should be 10-minute values for V1-3 RMS in the 10-minute log (where the values correspond with the 4-30 definition for 10-minute aggregation intervals, which does use an RMS algorithm).

Regarding the question about 10-minute values for I1-3 RMS, the meter does calculate these values, but they are not included in the default log.  In the ION framework, you can find the 10-minute values for current as output registers on the Power Quality Aggregator module.  They are not logged because (as Daniel noted) there is no normative definition for these parameters in the currently published edition of 4-30 (though an upcoming edition of 4-30 is expected to add this).  If you want to log these 10-minute current values (so they are accessible in the SQL database), you should be able to customize your ION framework to add this functionality in a new log.  Or alternatively, you could use the data from the Hist Mean Log mentioned in an earlier comment (which just provides an arithmetic average of the one-second RMS values), and adjust the framework to use a 10 minute interval instead of the default 15 minute interval.

Best regards,

David Tuckey

Firmware Architect

[Sven_Ortmann]

thank you all for the help and answers

i have another question:

is it possible to enable a potential-free contact with ION7650 if one of these Events is outside the tolerance:

- Deviation of voltage +-10%, Stop at +-8%

- Change of U +-5%

- deviation of sinus pretime 1sec + posttime 3 sec

[Aminadra · Accepted solution]

Hello Sven

Yes, you can assign a setpoint module and link the module to the digital output of the ION meter

[Hal_Etheridge]

For more complex logical conditions it is also possible to chain multiple setpoint modules together in an arbitrary order using And/Or modules.  The configuration could be multiple setpoint modules (all monitoring a single condition) with their status outputs connected to a single And/Or module (that evaluates the combined status of the alarms) that and is input to another setpoint that that generates the final overall alarm status that you then monitor in the SW (or link to a digitial output, etc).  Obviously you probably would want to change the event priority of the initial input setpoint modules to be zero or other low number to avoid generating alarms when they trigger (unless you are interested in when the preconditions trigger as well as the final output).

Remember that ION is like a big box of lego - lots of little pieces that can be assembled in whatever order you want to solve the big problem.  There are nearly always multiple ways to solve a problem so the above solution is just one of the possibilities.