GE SR750/760 Relay Tutorials - Part 7: Linking Phase Overcurrent Protection Element Parameters To Overcurrent RIO Function

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In this tutorial, shown linking of the Phase Overcurrent Protection Element parameters created in the previous tutorial into Overcurrent RIO function, defining overcurrent element characteristic, writing formula to use in the overcurrent element characteristic and using this template during the testing of the GE SR750/760 relay.


Welcome to the seventh part of GE SR750/760 Relay Tutorial series. If you haven't seen the previous tutorials, click the link below:

Part 6: Creating Phase Overcurrent Protection Element Blocks and Parameters
GE SR750/760 Relay Tutorials

Open the test document that we used in the previous tutorial (Part 6).

Once the test document is loaded, open the  test object. Make sure that the advanced view mode is selected to enable to link the parameters.

In the RIO block, open the Overcurrent block by double clicking on it then go to Elements tab. By default, there is one active element in the list. Click the button at the characteristic group to change the curve type. If there are multiple element in the list, select the element before clicking the button to change the selected curve.


There are predefined curve characteristics on the left side, select the IEC / BS142 NI curve under Predefined » Inverse folder then click select button below. Click OK button to apply and close the changes.


Now, the curve has changed and automatically added its parameters, the phase time overcurrent parameters created in the previous tutorial will be linked here. Before that, there couples of changes has to be made before linking those parameters.


Change the Time Overcurrent Element2 block. Maybe its different in your computer, it might be Time Overcurrent Element or Time Overcurrent Element3. Right click on it then select Details and set the following details

RIO » Overcurrent » Overcurrent Elements
Time Overcurrent Element2
ID PTOC
Name PTOC

Then enter and link the following formulas

RIO » Overcurrent » Overcurrent Elements » PTOC
Parameter Name Formula
Name NAME
NAME GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Name
Active FUNCTION_ENABLED
FUNCTION_ENABLED GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Function Enabled
Use Range Limits False
Use Reset Characteristic IS_LINEAR
IS_LINEAR GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Is Linear?
Use Blinder False
Reset Characteristic Type iif(IS_LINEAR, RCTINVERSETIME, RCTDEFINITETIME)
IS_LINEAR GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Is Linear?
RCTINVERSETIME RIO » Overcurrent » Overcurrent Elements » PTOC » Reset Characteristic Type » RCTINVERSETIME
RCTDEFINITETIME RIO » Overcurrent » Overcurrent Elements » PTOC » Reset Characteristic Type » RCTDEFINITETIME
Supervised Current IL
IL RIO » Overcurrent » Overcurrent Elements » PTOC » Supervised Current » IL
Directional Mode iif(DIRECTION = "FORWARD", FORWARD, iif(DIRECTION = "REVERSE", REVERSE, NONDIRECTIONAL))
DIRECTION RIO » Overcurrent » Overcurrent Elements » PTOC » Directional Mode
FORWARD RIO » Overcurrent » Overcurrent Elements » PTOC » Directional Mode » FORWARD
REVERSE RIO » Overcurrent » Overcurrent Elements » PTOC » Directional Mode » REVERSE
NONDIRECTIONAL RIO » Overcurrent » Overcurrent Elements » PTOC » Directional Mode » NONDIRECTIONAL
"FORWARD" "REVERSE" Manually type


In the RIO » Overcurrent » Overcurrent Elements » PTOC » Pick-up Current block, link the Ipickup,nom

RIO » Overcurrent » Overcurrent Elements » PTOC » Pick-up Current
Parameter Name Formula
Ipickup,nom PICKUP
PICKUP GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Pickup

In the RIO » Overcurrent » Overcurrent Elements » PTOC » Pick-up Current block, link the Nom. Time Multiplier

RIO » Overcurrent » Overcurrent Elements » PTOC » Time Multiplier/Trip Time
Parameter Name Formula
Nom. Time Multiplier MULTIPLIER
MULTIPLIER GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Multiplier

Go to Script Function block and insert the formula below.

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Public Function GetIDMTcoefficientValue(ByVal CurveName As String, ByVal Coefficient As String) As Double
    Dim A, B, C, D, E, F As Double
    A = 0 : B = 0 : C = 0 : D = 0 : E = 0 : F = 0
    Select Case CurveName
        Case "EXTREMELY_INVERSE" : A = 0.04 : B = 0.23 : C = 0.5 : D = 3.01 : E = 0.72 : F = 0
        Case "VERY_INVERSE" : A = 0.06 : B = 0.8 : C = 0.34 : D = -0.28 : E = 4.05 : F = 0
        Case "NORMALLY_INVERSE" : A = 0.03 : B = 2.26 : C = 0.3 : D = -4.19 : E = 9.13 : F = 0
        Case "MODERATELY_INVERSE" : A = 0.17 : B = 0.68 : C = 0.8 : D = -0.08 : E = 0.13 : F = 0
        Case "IEC_CURVE_A" : A = 0.14 : B = 0 : C = 0.02 : D = 1 : E = 0 : F = 0
        Case "IEC_CURVE_B" : A = 13.5 : B = 0 : C = 1 : D = 1 : E = 0 : F = 0
        Case "IEC_CURVE_C" : A = 80 : B = 0 : C = 2 : D = 1 : E = 0 : F = 0
        Case "IAC_EXTREMELY_INVERSE" : A = 0 : B = 0.64 : C = 0.62 : D = 1.79 : E = 0.25 : F = 0
        Case "IAC_VERY_INVERSE" : A = 0.09 : B = 0.8 : C = 0.1 : D = -1.29 : E = 7.96 : F = 0
        Case "IAC_INVERSE" : A = 0.21 : B = 0.86 : C = 0.8 : D = -0.42 : E = 0.19 : F = 0
        Case "IAC_SHORT_INVERSE" : A = 0.04 : B = 0.06 : C = 0.62 : D = 0 : E = 0.02 : F = 0
        Case "IEC_SHORT_INVERSE" : A = 0.05 : B = 0 : C = 0.04 : D = 1 : E = 0 : F = 0
    End Select
    Select Case Coefficient
        Case "A" : Return A
        Case "B" : Return B
        Case "C" : Return C
        Case "D" : Return D
        Case "E" : Return E
        Case "F" : Return F
        Case Else : Return 1
    End Select
End Function


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Public Function GetIDMTName(ByVal CurveName As String) As String
    Select Case CurveName
        Case "EXTREMELY_INVERSE" : Return "Extremly Inverse"
        Case "VERY_INVERSE" : Return "Very Inverse"
        Case "NORMALLY_INVERSE" : Return "Normally Inverse"
        Case "MODERATELY_INVERSE" : Return "Moderately Inverse"
        Case "IEC_CURVE_A" : Return "IEC Curve A"
        Case "IEC_CURVE_B" : Return "IEC Curve B"
        Case "IEC_CURVE_C" : Return "IEC Curve C"
        Case "IAC_EXTREMELY_INVERSE" : Return "IAC Extremely Inverse"
        Case "IAC_VERY_INVERSE" : Return "IAC Very Inverse"
        Case "IAC_INVERSE" : Return "IAC Inverse"
        Case "FLEXCURVE_A" : Return "FlexCurve A"
        Case "FLEXCURVE_B" : Return "FlexCurve B"
        Case "IAC_SHORT_INVERSE" : Return "IAC Short Inverse"
        Case "IEC_SHORT_INVERSE" : Return "IEC Short Inverse"
        Case Else : Return "IEC Curve A"
    End Select
End Function

Now go to RIO » Ovecurrent » Overcurrent Element » PTOC » Operating Curves » Inverse Parameter Curve block then enter and link the following formula below

RIO » Overcurrent » Overcurrent Elements » PTOC » Operating Curves Inverse » Parameter Curve
Parameter Name Formula
Active FUNCTION_ENABLED
FUNCTION_ENABLED GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Function Enabled
Name GetIDMTName(CURVE)
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve
A GetIDMTcoefficientValue(CURVE, "A")
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve
B GetIDMTcoefficientValue(CURVE, "B")
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve
C GetIDMTcoefficientValue(CURVE, "C")
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve
D GetIDMTcoefficientValue(CURVE, "D")
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve
E GetIDMTcoefficientValue(CURVE, "E")
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve
F GetIDMTcoefficientValue(CURVE, "F")
CURVE GE SR750/760 » XRIO » Phase Current » Phase Time Overcurrent » Phase Time Overcurrent Active » Curve

In the next tutorial, were going to test the GE 760 relay using this template for overcurrent element.

See you next time.

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