GE SR750/760 Relay Tutorials - Part 4: Add XRIO Parameters And Link Them To Other Parameters In The Test Object

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Welcome to the fourth part of GE SR750/760 Relay Tutorial series. In this tutorial, I will show you how to create Real, Enumeration, Boolean and Integer parameters and link them to other parameters.

If you haven't seen the previous tutorials, click the link below:
Part 3: Setup Omicron Control Center (OCC) for Testing
GE SR750/760 Relay Tutorials

Now, open the test document that created from the previous tutorial (Part 3).


Add new blocks and parameters

Open the Test Object in the test document, expand the relay parameters node and right click on to system setup then click Add Block and rename it to Sensing the same in the EnerVista 750/760 Setup.


Now, add four parameters for current sensing. One string data type and three real data type. Rename those as per the image below.


Right click on to current sensing parameter or double click on it to open the Parameter Details dialog box to change the name, ID, formula and other settings. See the parameter details in the table below.


Once the current sensing parameters completed, try to do the remaining parameters in the sensing node. See the following parameters in the table below. If the parameters is not in the table like description, foreign ID or etc. leave it blank or by default. I will show you that in the other part of this tutorial series.


GE SR750/760 > Relay Parameters > System Setup > Sensing
Parameter Value
Current Sensing
ID TITLE1
Name Current Sensing
Data Type String
Formula " "
Phase CT Primary
ID PHASE_CT_PRIMARY
Name Phase CT Primary
Value 1000
Reference value 1000
Data Type Real
Min Value 1
Max Value 50000
Unit A
Digits after decimal 0
Ground CT Primary
ID GROUND_CT_PRIMARY
Name Ground CT Primary
Value 500
Reference value 500
Data Type Real
Min Value 1
Max Value 50000
Unit A
Digits after decimal 0
Sensitive Ground CT Primary
ID SGROUND_CT_PRIMARY
Name Sensitive Ground CT Primary
Value 200
Reference value 200
Data Type Real
Min Value 1
Max Value 50000
Unit A
Digits after decimal 0
Bus VT Sensing
ID TITLE2
Name Bus VT Sensing
Data Type String
Formula " "
Bus VT Connection Type
ID BUS_VT_CONNECTION_TYPE
Name Bus VT Connection Type
Data Type Enumeration
Enumeration Values
ID Name
NONE None
WYE Wye
DELTA Delta
Value Wye
Bus Nominal VT Secondary Voltage
ID BUS_NOMINAL_VT_SECONDARY_VOLTAGE
Name Bus Nominal VT Secondary Voltage
Value 63.51
Reference Value 63.51
Data Type Real
Min Value 50.0
Max Value 240.0
Unit V
Digits after decimal 1
Bus VT Ratio
ID BUS_VT_RATIO
Name Bus VT Ratio
Value 100.0 : 1
Reference Value 100.0 : 1
Data Type String
Line VT Sensing
ID TITLE3
Name Line VT Sensing
Data Type String
Formula " "
Line VT Connection
ID LINE_VT_CONNECTION
Name Line VT Connection
Data Type Enumeration
Enumeration Values
ID Name
VAN Van
VBN Vbn
VCN Vcn
VAB Vab
VCB Vcb
Value An
Line Nominal VT Secondary Voltage
ID LINE_NOMINAL_VT_SECONDARY_VOLTAGE
Name Line Nominal VT Secondary Voltage
Value 110.0
Reference Value 110.0
Data Type Real
Min Value 50.0
Max Value 240.0
Unit V
Digits after decimal 1
Line VT Ratio
ID LINE_VT_RATIO
Name Line VT Ratio
Value 57.7 : 1
Reference Value 57.7 : 1
Data Type String
Power System
ID TITLE4
Name Power System
Data Type String
Formula " "
Nominal Frequency
ID NOMINAL_FREQUENCY
Name Nominal Frequency
Data Type Real
Value 50
Reference value 50
Data Type Real
Min Value 25
Max Value 60
Unit Hz
Digits after decimal 0
Phase Sequence
ID PHASE_SEQUENCE
Name Phase Sequence
Data Type Enumeration
Enumeration Values
ID Name
ABC ABC
ACB ACB
Value ABC
Cost of energy
ID COST_OF_ENERGRY
Name Cost of energy
Data Type Real
Value 5.0
Reference value 5.0
Data Type Real
Min Value 1.0
Max Value 25.0
Unit cents/kWh
Digits after decimal 1

Once completed it should be like in the image below.


Add new Block under GE SR750/760 node and set the following parameters:


GE SR750/760 > XRIO
XRIO
ID XRIO
Name XRIO
Enabled No

This should be look like in the image below.


Now, add new block under the new XRIO node and set the following parameters and this time we leave the enabled by default which is Yes. Because the XRIO node is already set to No or disabled. This mean XRIO node will not be displayed when we set the test object view to basic. You will notice that the XRIO node has a red X mark icon meaning this node and it's items will not shown in basic view mode.

GE SR750/760 > XRIO > Power System
Power System
ID POWER_SYSTEM
Name Power System

Add the following parameters in the table below at the Power System node.

GE SR750/760 > XRIO > Power System
Parameter Value
Phase CT Primary
ID PHASE_CT_PRIMARY
Name Phase CT Primary
Unit A
Phase CT Secondary
ID PHASE_CT_SECONDARY
Name Phase CT Secondary
Unit A
Ground CT Primary
ID GROUND_CT_PRIMARY
Name Ground CT Primary
Unit A
Ground CT Secondary
ID GROUND_CT_SECONDARY
Name Ground CT Secondary
Unit A
Sensitive Ground CT Primary
ID SG_CT_PRIMARY
Name Sensitive Ground CT Primary
Unit A
Sensitive Ground CT Secondary
ID SG_CT_SECONDARY
Name Sensitive Ground CT Secondary
Unit A
Bus VT Primary
ID BUS_VT_PRIMARY
Name Bus VT Primary
Unit V
Bus VT Ratio
ID BUS_VT_RATIO
Name Bus VT Ratio
Bus VT Secondary
ID BUS_VT_SECONDARY
Name Bus VT Secondary
Unit V
Line VT Primary
ID LINE_VT_PRIMARY
Name Line VT Primary
Unit V
Line VT Ratio
ID LINE_VT_RATIO
Name Line VT Ratio
Line VT Secondary
ID LINE_VT_SECONDARY
Name Line VT Secondary
Unit V
Frequency Nominal
ID FREQUENCY_NOMINAL
Name Frequency Nominal
Unit Hz

Once the Power System node and it's parameters created, it should be like in the image below.


Linking parameter to other parameters

I'm going to link first the Phase CT Primary at XRIO>Power System to Phase CT Primary value at Relay Parameters>System Setup>Sensing. Select Phase CT Primary parameter at XRIO>Power System node and click on to cell formula and right click inside of that cell then select Add Reference or hit Ctrl + I in the keyboard.


After right clicking or hitting Ctrl + I, the Insert Formula Reference dialog box will popup. In the dialog box, locate the Phase CT Primary parameter from Relay Parameter > System Setup > Sensing and select it.


The reference ID will display in the Ref ID textbox and it's value which is PHASE_CT_PRIMARY and 1000 A. Click OK to apply the selected parameter.


Do the same way for Ground CT Primary, Sensitive CT Primary, Bus VT Secondary, Line VT Secondary and Frequency Nominal. Once completed, that should look like in the image below.


The rest of the parameters are requiring formula so I'm going to use script to write some formula like calculating the ratio of VT and also, I'm going to use condition formula at Bus VT Secondary because the VT connection type is not compensated. I'm going to multiply it by square root of 3 when Wye connected or 1 when Delta connected.

BUS_NOMINAL_VT_SECONDARY_VOLTAGE * iif(BUS_VT_CONNECTION_TYPE=WYE, Sqrt(3),1)
To do that, right click on to Bus VT Secondary parameter under XRIO > Power System then select Details to display Parameter Details. In the formula textbox, BUS_NOMINAL_VT_SECONDARY_VOLTAGE is already in there. Add * iif( then right click on inside of the formula textbox then locate Bus VT Connection Type under the Relay Parameters > System Setup > Sensing then click OK.


Then add = sign then right click on inside the textbox again then locate Wye under Relay Parameters> System Setup > Sensing > Bus VT Connection Type then click OK.


After that, add comma sign (,) then add sqrt(3) then comma sign (,) the 1 and add ) at the end of the formula. That should look like in the image below.


Make a formula in the script function editor

Now, let's write formula that calculate the ratio  of the given VT Ratio. In the test object, click on to Script Functions node then copy the script below and paste it to the script function editor.

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Function GetVTRatio(Ratio As String) As Double
    Dim rs As String() = Ratio.Split(":")
    If Ubound(rs) = 1 Then
        Return Val(rs(Lbound(rs)).Trim)
    ElseIf Ubound(rs) = 2 Then
        Dim u As Double = val(rs(Lbound(rs)).Trim)
        Dim l As Double = val(rs(Ubound(rs)).Trim)
        Return u / l
    Else
        Return Val(Ratio.Trim)
    End If
End Function


Then click Compile button to check if there's no errors and warnings in the script.


Let's use the GetVTRatio formula in the parameter formula. Select XRIO > Power System > Bus VT Ratio parameter and double click on to little black arrow to display it's parameter details. In the formula textbox, type GetVTRatio( and right click on it then locate the Bus VT Ratio parameter under Relay Parameters > System Setup > Sensing then click OK to add the selected parameter then type ) at the end. That should be look like the image below.


Then, click OK button. Bus VT Ratio must have a new value which is 100. Do the same way to Line VT Ratio and that must have a new value of 57.7.


We now have VT Ratio and VT Secondary. It's time to get the VT Primary using the formula below



Now, double click on to Bus VT Primary under the XRIO > Power System node to display the parameter details dialog box and right click on the formula textbox then locate the VT Secondary under the XRIO > Power System node than click OK


Then, type * (asterisk sign) then right click again on the formula textbox then select the Bus VT Ratio under the XRIO > Power System node then click OK and then click OK to close the parameter details dialog box. Make sure the cursor position is at the end of the formula before do the right click.


We have now Bus VT Primary value which is 11000.25 and we must use round off formula to make it 11000.00


That's it for now. In the next part I will show you how to link those parameters in the Device RIO function and also I will show you how to make this template flexible for the testing.


Summary

In this tutorial, we've learned the following

  • Adding of  XRIO block
  • Adding of XRIO parameters with different data type
  • Linking parameter to other parameters
  • Making formula in the script function editor
  • Using formula in the parameter formula textbox

See you next time.





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