Megger MRCT - Figure 73: VT Ratio Test Screen

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8. After the MRCT has been placed into the voltage transformer mode, select the “Ratio Test”

button .

Figure 73: VT Ratio Test Screen

9. If the VT has two taps then the test can be ran by selecting the blue play button. Otherwise

hit the Select Number of Tap functions button to select the appropriate number of taps

10. After selecting the appropriate number of taps use the Winding Selector to select the

appropriate winding to be tested

11. After selecting the appropriate winding, select the play button and a connection diagram will

appear showing how to correctly connect the MRCT to the VT

Main Page

Description3
Table of Contents6
List of Figures8
STVI Introduction10
Smart Touch View Interface10
Figure 1: Smart Touch View Interface10
Terminology11
Figure 2: STVI Rear-View11
Acronyms12
Power over Ethernet Input Power12
MRCT with Integrated Display13
Figure 3: MRCT with Integrated Display13
Setup14
Unpack System14
Initial Start up14
Communication Ports14
Ethernet Port14
Figure 4: STVI Port on MRCT14
USB 2.0 Interface15
Smart Touch View Interface15
Figure 5: Introduction Screen15
Figure 6: Boot up Home Screen CT Only16
Figure 7: Boot up Home Screen for CT and VT17
STVI Menu Items19
Device Connections19
Device Settings19
Figure 8: Device Settings20
Nameplate Information22
Figure 9: Name Plate Data22
Home Screen24
Figure 10: Home Screen for CT Testing Only24
Figure 11: Home Screen for CT and VT Testing24
CT Testing25
Run All Tests25
Figure 12: Run All Test Screen25
Manual Test26
Figure 13 Manual Test Screen26
Demagnetization30
Figure 14: Demagnetization Connection Diagram31
Figure 15: Demagnetization Process31
Self Test32
Relay32
Saturation33
Figure 16: Saturation Test Screen33
Ratio34
Figure 17: Ratio Test Screen35
Winding Resistance36
Figure 18: Winding Resistance Test Screen36
Insulation Test37
Figure 19: Insulation Resistance Test Screen38
Burden39
Figure 20: Burden Test Screen39
View CT Report40
Figure 21: Customer Information40
Figure 22: Sample Test Report41
Delete CT Data42
Report Configuration43
Figure 23: Sample Mutlitap CT Test Report43
Figure 24: Ratio and Phase Error Tables44
Excitation Curve Data45
Figure 25: Report Configuration45
Figure 26: View Saturation Data46
VT Testing Functions47
Figure 27: Excitation Curve Data47
Ratio48
Figure 28: VT Testing Mode48
Figure 29: VT Ratio Test Screen48
Winding Resistance49
Figure 30: VT Winding Resistance Test Screen50
Functions Available for All Configuration51
File Operations51
Figure 31: File Operation Tool Bar51
Figure 32: File Manager Screen52
Service Data53
Preventive Maintenance53
Examine the Unit Every Six Months for54
Upgrading STVI Software54
Service and Repair Instructions55
Basic Troubleshooting55
Power Input56
Ethernet Cable56
Ratio Errors56
Preparation for Reshipment57
Step by Step Testing a CT with MRCT57
Test Plan Creation and Testing of CT57
Figure 33: Run All Tests - Configuration59
Figure 34: Run All Tests - Multi Tap60
Figure 35: Connection Diagram 5 Tap Concurrent60
Figure 36: Saturation Testing Screen - Concurrent61
CT Saturation Test62
Method 1 - Concurrent62
Figure 37: Testing Report - Concurrent62
Figure 38: Saturation Test Screen - Concurrent63
Figure 39: Saturation Connection Diagram - Concurrent64
Figure 40: Saturation Testing Screen - Concurrent65
Figure 41: Saturation Results Screen - Concurrent65
Method 2 - Non Concurrent or Testing a Single Tap66
Figure 42: Saturation Test Screen - Non Concurrent67
Figure 43: Saturation Connection Diagram - Non Concurrent68
CT Ratio Test69
Method 1 - Concurrent69
Figure 44: Saturation Test Screen Non Concurrent69
Figure 45: CT Ratio Test Screen - Concurrent71
Figure 46: CT Ratio Connection Diagram - Concurrent71
Figure 47: CT Ratio Test Abort72
Figure 48: CT Ratio Test Results - Concurrent73
Method 2 - Non Concurrent or Testing a Single Tap74
Figure 49: CT Ratio Test Screen - Non Concurrent75
Figure 50: CT Ratio Test Connection Diagram - Non Concurrent76
Figure 51: CT Ratio Testing Screen - Non Concurrent77
CT Winding Resistance Test78
Method 1 - Concurrent78
Figure 52: CT Ratio Test Results - Non Concurrent78
Figure 53: CT Winding Test Screen - Concurrent80
Figure 54: CT Winding Connection Diagram - Concurrent80
Figure 55: CT Winding Test ABORT81
Method 2 - Non Concurrent or Testing a Single Tap82
Figure 56: CT Winding Results - Concurrent82
Figure 57: CT Winding Test Screen - Non Concurrent83
Figure 58: CT Winding Resistance Connection Diagram Non Concurrent84
Figure 59: CT Winding Test Screen -Abort85
Figure 60: CT Winding Results - Non Concurrent85
CT Insulation Test86
Figure 61: CT Insulation Test Screen87
Figure 62: CT Insulation Test Connection Diagram87
Figure 63: CT Insulation Testing Screen88
CT Burden Test89
Figure 64: CT Insulation Test Results89
Figure 65: CT Burden Test Screen90
Figure 66: CT Burden Test Connection Diagram91
Figure 67: CT Burden Test Abort92
Figure 68: CT Burden Test Results Screen92
Manual Test of CT93
Figure 69: CT Manual Test Screen94
Figure 70: CT Manual Test Connection Diagram95
CT Demagnetization96
Figure 71: CT Demagnetization Connection Diagram97
Figure 72: CT Demagnetizing Screen97
Step by Step Testing a VT with MRCT98
Voltage Transformer Ratio and Phase98
Figure 73: VT Ratio Test Screen99
Figure 74: VT Ratio Test Connection Diagram100
Figure 75: VT Ratio Testing Screen101
Figure 76: VT Ratio Test Results101
Testing Voltage Transformer Secondary Winding Resistance102
Figure 77: VT Winding Test Screen103
Figure 78: VT Winding Resistance Connection Diagram103
Figure 79: VT Winding Test Screen -Abort104
Self Test105
Figure 80: VT Winding Results105
Figure 81: Self Diagnostic Connection Diagram106
Figure 82: Self Diagnostic Test Screen107
Figure 83: Testing Bushing CT Installed in a Power Transformer- a109
Figure 84: Testing Bushing CT Installed in a Power Transformer- B111

Megger MRCT - Figure 73: VT Ratio Test Screen

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