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Summary of Contents for Megger MRCT
- Page 1 MEGGER RELAY AND CURRENT TRANSFORMER TEST INSTRUMENT MRCT USER MANUAL February 26, 2016 Part#82950R5...
- Page 2 Megger. Megger, the Megger logo are trademarks of Megger. All other trademarks are the property of their respective owners.
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Page 3: Description
SAFETY PRECAUTIONS WARNING: VOLTAGES GENERATED BY THIS INSTRUMENT CAN BE HAZARDOUS This instrument has been designed for operator safety; however, no design can completely protect against incorrect use. Electrical circuits are dangerous and can be lethal when lack of caution and poor safety practices are used. There are several standard safety precautions that should be taken by the operator. - Page 4 The purpose of this equipment is limited to use as described in this instruction manual. Should a situation arise that is not covered in the general or specific safety precaution please contact Megger regional representative or Megger, Dallas Texas.
- Page 5 WEEE The crossed out wheeled bin placed on Megger products is a reminder not to dispose of the product at the end of its life with general waste. Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No...
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Page 6: Table Of Contents
Smart Touch View Interface ......................10 Terminology ............................11 1.2.1 Acronyms ........................12 Power Over Ethernet Input Power ....................12 MRCT with Integrated Display ................13 Setup ........................14 Unpack System ............................14 3.1.1 Initial Start Up ......................14 Communication Ports ........................14 3.2.1... - Page 7 CT Insulation Test: ..........................86 CT Burden Test ............................ 89 Manual Test of CT ..........................93 CT Demagnetization .......................... 96 10.0 Step by Step Testing a VT with MRCT ..............98 10.1 Voltage Transformer Ratio and Phase ..................98 10.2 Testing Voltage Transformer Secondary Winding Resistance ........
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Page 8: List Of Figures
List of Figures Figure 1: Smart Touch View Interface ..................10 Figure 2: STVI Rear-View....................... 11 Figure 3: MRCT with Integrated Display ................. 13 Figure 4: STVI port on MRCT....................14 Figure 5: Introduction Screen ....................15 Figure 6: Boot Up Home Screen CT only ................. 16 Figure 7: Boot Up Home Screen for CT and VT .............. - Page 9 Figure 44: Saturation Test Screen Non Concurrent ..............69 Figure 45: CT Ratio Test Screen - Concurrent ................ 71 Figure 46: CT Ratio Connection Diagram - Concurrent ............71 Figure 47: CT Ratio Test Abort....................72 Figure 48: CT Ratio Test Results - Concurrent ............... 73 CT Ratio Test Screen –...
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Page 10: Stvi Introduction
This manual contains the information that you will need in order to set up and use your STVI with the MRCT Test Systems. How the unit operates, some of the different types of testing you can do, and how to save and view your test results with the Smart Touch View Interface software is described. -
Page 11: Terminology
TFT LCD Color Display – this 8.5 inch touch panel display provides high resolution, and features Wide Viewing Angle Technology with high luminance for reading in direct sunlight 2. Control Knob – this knob will adjust values once the box location of the value to be changed is selected. -
Page 12: Acronyms
Unit Under Test Power Over Ethernet Input Power The STVI gets Power Over Ethernet (PoE) of 48 Volts DC at 0.5 A from the MRCT. CAUTION: NOTE: The PoE power supply DC voltage is ON when the power supply is connected to a power source. -
Page 13: Mrct With Integrated Display
MRCT with Integrated Display The MRCT can also be ordered with an integrated display instead of using the STVI to control the unit. The MRCT will have an 8.5 inch TFT LCD Color Display – this touch panel display provides high resolution, and features Wide Viewing Angle Technology with high luminance for reading in direct sunlight. -
Page 14: Setup
3.2.1 Ethernet Port There is one Ethernet port on the STVI for connecting to the MRCT units. On the MRCT the port is labeled STVI. For the MRCT it connects to the PoE power supply unit, and the PoE unit is connected to... -
Page 15: Usb 2.0 Interface
There are two USB 2.0 Interface ports on the STVI unit. These ports are used for upgrading firmware to the MRCT unit, or upgrading the STVI software using a USB Memory Stick. They may also be used in conjunction with a USB mouse for ease of manual control, even a USB wireless mouse maybe used with the STVI. -
Page 16: Figure 6: Boot Up Home Screen Ct Only
The user should select the connection icon in the top left conner to connect to the MRCT. The user will then be brought to the “Home Screen”. If the MRCT has an integrated display, after powering up the MRCT, the user will be brought to the “Homes Screen” automatically. Depending upon how the MRCT was configured the user will see the “Home Screen”... -
Page 17: Figure 7: Boot Up Home Screen For Ct And Vt
Figure 7: Boot Up Home Screen for CT and VT From either of the Home screens the user can navigate to the desired test screen. All individual test screens and settings for the unit can also be accessed from this screen. By pressing the navigation buttons on this screen, one can select the desired operation. - Page 18 Demagnetization “Self Diagnostic” Relay Saturation Test Ratio Test Winding Resistance Test Insulation Test Burden Test User Help The following are additional user selectable operations if the unit has been configured for VT/CVT testing . VT Testing Mode VT Ratio Test...
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Page 19: Stvi Menu Items
Refer to each menu item below for detailed description 3.3.1 STVI Menu Items 3.3.1.1 Device Connections Selection of Device Connection button will initialize the connection of a PC to the MRCT 3.3.1.2 Device Settings Selection of Device Settings, brings the user the following screen. -
Page 20: Figure 8: Device Settings
Primary Current ( 101:5) or displayed on Secondary Current ( 100:4.99) Set Date Time Change the time and date stored in the MRCT. This option is only Available on MRCT with integrated display Show Connection Diagrams: Allows user to turn off the functionality showing connection Diagrams before each test. - Page 21 AC Saturation or DC Saturation Toggles between the 2 different saturation techniques used by the MRCT. In AC Saturation mode the MRCT will utilize up to 2000 V AC to saturate the CT. In DC saturation mode the MRCT will utilize DC voltage to saturate CT’s up to 30 kV and then convert testing results into AC equiveleant.
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Page 22: Nameplate Information
settings include: Number Format, Adjust Screen Brightness, Set Date & Time, and Logging. If the application is running on a standard PC or laptop then these settings are adjusted within the PC’s operating system such as Windows. 3.3.1.3 Nameplate Information Selection of Name Plate Information, brings the user to the following screen Figure 9:... - Page 23 30V. So in order to gather enough data points to calculate the knee point, if the type of CT is set to “Metering” the MRCT will increment the voltage during the excitation by ½ V increments. Conversely a relaying/protection class CT will saturate at much higher voltage levels.
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Page 24: Home Screen
Selection of Home Button, the user will be brought to the home screen from which the user can navigate to any test. If the MRCT was configured for CT testing only then the following screen will be the “Home Screen”... -
Page 25: Ct Testing
4.0 CT Testing 4.1 Run All Tests Selection of Run All Tests button will bring the user to the Test Configuration screen Figure 122: Run All Test Screen The user can easily configure a test plan for a current transformer by checking the box adjacent to the desired test of the desired tap. -
Page 26: Manual Test
Used to toggle between Concurrent Testing of all taps and testing tap individually. Button used to toggle insulation test between 1KV and 500V Manual Test Selection of the Manual Test Button, will bring the user to the following Manual Test Screen. - Page 27 Then selecting the ON button on the touch screen the MRCT will first display a connection diagram. Once the user verifies the connection, by selecting the blue play button the MRCT will output the specified current level Ratio Testing; To manually test the ratio of a CT the user is required to first select which individual tap...
- Page 28 Once the user has verified proper connections, the test is continued by selecting the blue play button on the connection diagram. After the MRCT has begun to inject voltage, the voltage and current readings will be displayed along with the calculated ratio. In order to ensure accurate results on the ratio, the voltage should be ramped to a level of at least 10% of the value of the knee point of the CT.
- Page 29 Hitting the select tap button will activate the tap selection dialog After selection of the desired individual tap selection, the user may adjust the voltage increment selecting the Ramp adjustment button This will activate the ramp parameter dialog allowing the user may select the amount of increment the voltgae is either decreased ir increased by turning the knob on the STVI or the up/down arrow keys on a laptop After the desired tap selection is made and any adjustments made to the ramp parameter, the user...
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Page 30: Demagnetization
Once the user has generated at least two data points, the MRCT will begin to graph the saturation curve. The user can then continue to ramp the voltage while taking data points until the CT reaches saturation. -
Page 31: Figure 14: Demagnetization Connection Diagram
Figure 1414: Demagnetization Connection Diagram After confirming the connections are correct, continue with demagnetizing the CT by selecting the green CHECK. The red X will cancel the operation. After selecting to continue the operation, the user will be advised that the CT is being demagnetized Figure 1515: Demagnetization Process Upon completion, the user will be returned to the Main Test Configure Screen and notified the demagnetization process is complete. -
Page 32: Self Test
“Self Diagnostic” navigation button from the home screen will display a connection diagram After the user has ensured the MRCT is connected properly as in the diagram, the self test is begun by selecting the blue play button While the user can completely test a current transformer from the Run All Tests screen, individual tests amy be accessed from the correlating buttons in the drop down list. -
Page 33: Saturation
Saturation Selection of Saturation Test button from the test configuration screen will bring the user to the following Saturation Test screen Figure 16: Saturation Test Screen Within this screen the user can select between Concurrent and Non concurrent Testing When Concurrent Mode of testing is selected, the user is required to select how many taps is desired to test simultaneously However if the Non Concurrent Mode of testing is selected, the user is required to select which individual tap is desired... -
Page 34: Ratio
Hitting the select tap button will activate the tap selection dialog After either selecting the number of taps or the individual tap selection, the saturation test is begun by selecting the blue play button. 4.7 Ratio Selection of Ratio Test button from the test configuration screen will bring the user to the following Ratio Test screen... -
Page 35: Figure 17: Ratio Test Screen
Figure 17: Ratio Test Screen Within this screen the user can select between Concurrent and Non concurrent Testing When Concurrent Mode of testing is selected, the user is required to select how many taps is desired to test simultaneously However if the Non Concurrent Mode of testing is selected, the user is required to select which individual tap is desired Hitting the select tap button will activate the tap selection dialog... -
Page 36: Winding Resistance
After either selecting the number of taps or the individual tap selection, the ratio test is begun by selecting the blue play button. Winding Resistance Selection of Winding Resistance Test button from the test configuration screen will bring the user to the following Winding Resistance Test screen. Figure 188: Winding Resistance Test Screen Within this screen the user can select between Concurrent and Non concurrent Testing... -
Page 37: Insulation Test
When Concurrent Mode of testing is selected, the user is required to select how many taps is desired to test simultaneously However if the Non Concurrent Mode of testing is selected, the user is required to select which individual tap is desired Hitting the select tap button will activate the tap selection dialog After either selecting the number of taps or the individual tap selection, the Winding Resistance test is begun by selecting the blue play button. -
Page 38: Figure 19: Insulation Resistance Test Screen
Figure 199: Insulation Resistance Test Screen Within the Insulation test screen, the user may select the desired test level of either 500V or 1 KV by using the Voltage selection button Each test may be set to a different test voltage. The user can also set the same test voltage to all tests by selecting the all Ranges Button And then selecting the desired voltage... -
Page 39: Burden
After selecting the desired test voltage, the user may select which test is desired by checking the correlating check box. Then after selecting both the desired test voltage and the desired test, the insulation testing is begun by selecting the blue play button. 4.10 Burden Selection of... -
Page 40: View Ct Report
After either selecting the appropriate test current, the burden test is begun by selecting the blue play button. 4.11 View CT Report If a test has been run and data is present the View Test Report button will be available. Selection of this button will generate a report of all test data for the active CTs. -
Page 41: Figure 22: Sample Test Report
Figure 22: Sample Test Report... -
Page 42: Delete Ct Data
4.12 Delete CT Data If a test has been ran and data is present; the Delete Test Data button will be available. Selection of this button activates the following dialog This will allow the user three options of deleting data ... -
Page 43: Report Configuration
Figure 23: Sample Mutlitap CT Test Report The MRCT will provide a concise one page report that will include all testing results including the data from the following tests: excitation; ratio; phase deviation; polarity; winding resistance; and insulation resistance. The MRCT report can also be configured to provide additional data including the ratio and... -
Page 44: Figure 24: Ratio And Phase Error Tables
Figure 24: Ratio and Phase Error Tables Ratio & Phase Error Button If the user has entered the following CT Name Plate information: CT Type either Metering or Relaying Accuracy Class Burden and/or VA Ratio And the user has rand the following tests: ... -
Page 45: Excitation Curve Data
Figure 25: Report Configuration Here the user can configure the report to contain the ratio and phase error tables and graphs for any combination of taps or all the taps. If the CT is an ANSI metering class CT, then the accuracy parallelograms will also be available. -
Page 46: Figure 26: View Saturation Data
Figure 26: View Saturation Data Within the test screen, if the test has completed and data is available, the user can access this data by selecting the “ View Data” button. Selection of the view data button will launch a data viewer that will allow the user to view, or copy the data for inclusion into a separate file that can be included with the standard CT Test Report. -
Page 47: Vt Testing Functions
Within the “Home Screen “ selecting the the VT TEST button will cause the button to turn bright yellow. This will inform the user that the MRCT is now in VT Testing mode. From here the user will have access... -
Page 48: Ratio
Figure 28: VT Testing Mode Ratio Selection of Ratio Test button from the home screen will bring the user to the following Ratio Test screen Figure 29: VT Ratio Test Screen... -
Page 49: Winding Resistance
If the user selects more than two taps then the user is also required to select which tap is desired to test Since the connections are different that when testing CT, the MRCT is only capable of test ing VTs one tap at a time. -
Page 50: Figure 30: Vt Winding Resistance Test Screen
Figure 30: VT Winding Resistance Test Screen Within this screen the user can select the number of taps of the VT. The default number of taps is two. If the user selects more than two taps then the user is also required to select which tap is desired to test If the user selects more than two taps then the user is also required to select which tap is desired to test... -
Page 51: Functions Available For All Configuration
Since the connections are different that when testing CT, the MRCT is only capable of test ing VT one tap at a time. After either selecting the number of taps or the individual tap selection, the secondary winding resistance test is begun by selecting the blue play button. -
Page 52: Figure 32: File Manager Screen
Figure 32: File Manager Screen File manager screen is used to view and access the stored test results. All stored test results are displayed in alphabetical order along with date and time stampings. Function buttons are used to recall, delete or transfer the test results. The function buttons are used to manage files as below: Used to open file highlighted in the internal storage list Used to save file named in edit box to system memory... -
Page 53: Service Data
The warranty is in lieu of all other warranties, either expressed or implied on the part of Megger and in no event shall Megger be liable for the consequential damages due to the breach thereof. -
Page 54: Examine The Unit Every Six Months For
Upgrade via Compact Disk Where internet access may not be available or blocked on your computer, Megger can provide a CD with the latest version of software on it. Contact your local Megger representative to order a copy of the firmware. -
Page 55: Service And Repair Instructions
The troubleshooting information relies on the technician to have a good understanding of the operation of the unit. The technician should contact the factory should they have any questions regarding the operation of the unit. Provide the Megger the serial number of the STVI when making inquiries. -
Page 56: Power Input
Erratic operation, no display, or a dim display. High voltage: Circuit breaker operation on MRCT unit, power supply failure. a. For MRCT, the internal power supply needs to be repaired or replaced, contact the factory for further instructions. 7.2.1.2 Ethernet Cable... -
Page 57: Preparation For Reshipment
MRCT for the dissipation of induced voltage in high voltage yards. This allows the MRCT to test in environments that other instruments cannot. However, care must be taken when connecting the primary test leads on large transformers to ensure that a ground loop is not being created. - Page 58 CT (H1 on the test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test.
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Page 59: Figure 33: Run All Tests - Configuration
Figure 33: Run All Tests - Configuration Select the individual taps for saturation testing by placing a check in the corresponding box. Or select all taps by selecting the button. This will place a check corresponding to all taps. Select the individual taps for ratio testing by placing a check in the corresponding box. -
Page 60: Figure 34: Run All Tests - Multi Tap
Run All Tests - Multi Tap It can also be ran at this time by selecting the Blue Play button A connection diagram will appear showing how to properly connect the MRCT to the CT Figure 35: Connection Diagram 5 Tap Concurrent... -
Page 61: Figure 36: Saturation Testing Screen - Concurrent
Test can also be stopped under emergency condition by hitting the “Emergency Push to Stop” button on the front panel of MRCT. Unit will shut off the output voltage After releasing the Emergency Stop Button, the test will need to be restarted... -
Page 62: Ct Saturation Test
Figure 37: Testing Report - Concurrent CT Saturation Test 9.2.1 Method 1 – Concurrent Refer to the safety instructions first before use of the equipment. 1. Verify the Power ON/OFF switch is OFF. Power the test set from a suitable source of power (95- 265 V50/60 Hz). -
Page 63: Figure 38: Saturation Test Screen - Concurrent
CT (H1 on the test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. -
Page 64: Figure 39: Saturation Connection Diagram - Concurrent
X Voltage (V): The MRCT displays the real time voltage readings of the secondary X winding while the test is in progress. X Current (A): The MRCT the real time current readings for the secondary X winding while the test is in progress. -
Page 65: Figure 40: Saturation Testing Screen - Concurrent
16. Test can also be stopped under emergency condition by hitting the “Emergency Push to Stop” button on the front panel of MRCT. Unit will shut off the output voltage 17. After releasing the Emergency Stop Button, the test will need to be restarted 18. -
Page 66: Method 2 - Non Concurrent Or Testing A Single Tap
CT (H1 on the test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. -
Page 67: Figure 42: Saturation Test Screen - Non Concurrent
10. Select the tap configuration before hitting the PLAY button. If PLAY button is pressed before selecting the tap, following message will appear: After selecting the appropriate tap, select the play button and a connection diagram will appear showing how to correctly connect the MRCT to the CT... -
Page 68: Figure 43: Saturation Connection Diagram - Non Concurrent
Check all connections to ensure correctness Hit Blue Play button to begin test. The saturation will begin. X Voltage (V): The MRCT displays the real time voltage readings of the secondary X winding while the test is in progress. -
Page 69: Ct Ratio Test
15. The test can also be stopped under emergency condition by hitting the “Emergency Push to Stop” button on the front panel of MRCT. Unit will shut off the output voltage 16. After releasing the Emergency Stop Button, the test will need to be restarted 17. - Page 70 CT (H1 on the test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test.
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Page 71: Figure 45: Ct Ratio Test Screen - Concurrent
Figure 45: CT Ratio Test Screen - Concurrent 11 Select the play button and a connection diagram will appear showing the proper connections for the MRCT to the CT Figure 46: CT Ratio Connection Diagram - Concurrent Check all connections to ensure correctness... -
Page 72: Figure 47: Ct Ratio Test Abort
X Current (A): The MRCT the real time current readings for the secondary X winding while the test is in progress. H Voltage (V): The MRCT the real time voltage readings of the primary H winding while the test is in progress. -
Page 73: Figure 48: Ct Ratio Test Results - Concurrent
Figure 48: CT Ratio Test Results - Concurrent Polarity: Unit automatically determines the polarity connections and displays the result as either polarity Correct or Incorrect. The phase angle deviation between the secondary and primary voltage is also displayed along with polarity. The ratio is defined as the number of turns in the secondary as compared to the number of turns in the primary. -
Page 74: Method 2 - Non Concurrent Or Testing A Single Tap
CT (H1 on the test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. -
Page 75: Figure 49: Ct Ratio Test Screen - Non Concurrent
10. Select the tap configuration before hitting the PLAY button. If PLAY button is pressed before selecting the tap, following message will appear: After selecting the appropriate tap, select the play button and a connection diagram will appear showing how to correctly connect the MRCT to the CT... -
Page 76: Figure 50: Ct Ratio Test Connection Diagram - Non Concurrent
Enter a voltage 1V and 300V that is less than the knee point of the CT Hit Blue Play button to begin test The Ratio test will begin. X Voltage (V): The MRCT displays the real time voltage readings of the secondary X winding while the test is in progress. -
Page 77: Figure 51: Ct Ratio Testing Screen - Non Concurrent
X Current (A): The MRCT the real time current readings for the secondary X winding while the test is in progress. H Voltage (V): The MRCT the real time voltage readings of the primary H winding while the test is in progress. -
Page 78: Ct Winding Resistance Test
Figure 52: CT Ratio Test Results – Non Concurrent Polarity: Unit automatically determines the polarity connections and displays the result as either polarity Correct or Incorrect. The phase angle deviation between the secondary and primary voltage is also displayed along with polarity. The ratio is defined as the number of turns in the secondary as compared to the number of turns in the primary. - Page 79 X1(CT), X2( test set ) to X2 ( CT ), and Xn (test set ) to X3 ( CT) WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test.
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Page 80: Figure 53: Ct Winding Test Screen - Concurrent
Figure 53: CT Winding Test Screen – Concurrent Select the play button and a connection diagram will appear showing the proper connections for the MRCT to the CT Figure 54: CT Winding Connection Diagram – Concurrent Check all connections to ensure correctness... -
Page 81: Figure 55: Ct Winding Test Abort
Voltage (V): The MRCT displays the real time voltage readings of the secondary winding while the test is in progress. Current (A): The MRCT the real time current readings for the secondary winding while the test is in progress. -
Page 82: Method 2 - Non Concurrent Or Testing A Single Tap
Figure 56: CT Winding Results - Concurrent Winding resistance test is used to determine if the dc resistance of the CT secondary winding is within specification or not. A DC current is applied and voltage is measured to determine the winding resistance for the selected tap. -
Page 83: Figure 57: Ct Winding Test Screen - Non Concurrent
Observe the polarity marks on the CT (X1 on test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. Turn Power ON/OFF switch to ON. -
Page 84: Figure 58: Ct Winding Resistance Connection Diagram Non Concurrent
while the test is in progress. X Current (A): The MRCT the real time DC current readings for the secondary X winding while the test is in progress. 13. At any point of time Test can be terminated by hitting the ABORT button at the top... -
Page 85: Figure 59: Ct Winding Test Screen -Abort
Test can also be stopped under emergency condition by hitting the “Emergency Push to Stop” button on the front panel of MRCT. Unit will shut off the output voltage 15. After releasing the Emergency Stop Button, the test will need to be restarted. -
Page 86: Ct Insulation Test
Outer Winding. Observe the polarity marks on the CT (X1 on test set is polarity terminal). WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. Turn Power ON/OFF switch to ON. -
Page 87: Figure 61: Ct Insulation Test Screen
Primary to Ground c) Secondary to Ground Select the play button and a connection diagram will appear showing how to correctly connect the MRCT to the CT Figure 62: CT Insulation Test Connection Diagram Check all connections to ensure correctness... -
Page 88: Figure 63: Ct Insulation Testing Screen
Test can also be stopped under emergency condition by hitting the “Emergency Push to Stop” button on the front panel of MRCT. Unit will shut off the output voltage 24. After releasing the Emergency Stop Button, the test will need to be restarted the test begun again. -
Page 89: Ct Burden Test
Connect the test set primary binding posts H1 and H2 to either side of the CT burden. and H2. WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. -
Page 90: Figure 65: Ct Burden Test Screen
1 Amp or 5 Amp based upon secondary current rating of the CT under test Figure 65: CT Burden Test Screen Select the play button and a connection diagram will appear showing how to correctly connect the MRCT to the CT... -
Page 91: Figure 66: Ct Burden Test Connection Diagram
Hit Blue Play button to begin test. The Burden test will begin. Voltage (V): The MRCT displays the real time voltage readings of the burden while the test is in progress. Current (A): The MRCT the real time current readings for the burden while the test is in progress. -
Page 92: Figure 67: Ct Burden Test Abort
13. Test can also be stopped under emergency condition by hitting the “Emergency Push to Stop” button on the front panel of MRCT. Unit will shut off the output voltage 14. After releasing the Emergency Stop Button, the test will need to be restarted. -
Page 93: Manual Test Of Ct
Connect the test set primary binding posts H1 and H2 to either side of the CT burden. and H2. WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. -
Page 94: Figure 69: Ct Manual Test Screen
Figure 69: CT Manual Test Screen 8. In the Manual Test screen, by selecting the Ramp adjustment button , the user may select the amount of increment the voltgae is either decreased ir increased by turning the knob on the STVI. After making this selection, select the appropriate tap to be tested, 10. -
Page 95: Figure 70: Ct Manual Test Connection Diagram
Figure 70: CT Manual Test Connection Diagram 11. Ensure the MRCT is properly connected. 12. Begin the test by selecting the Blue play button. 13. The MRCT will display: Secondary (X) Voltage: The applied secondary test voltage is displayed on the screen in digital readout form. -
Page 96: Ct Demagnetization
TOUCH connector clips or test leads while the MRCT is performing a test. Turn Power ON/OFF switch to ON. After the boot up, in the Home Screen select the “Demagnetization” button A connection diagram will appear showing how to properly connect the MRCT to the CT... -
Page 97: Figure 71: Ct Demagnetization Connection Diagram
Figure 71: CT Demagnetization Connection Diagram 9. Confirming all the connections are correct, 10. Continue with demagnetizing the CT by selecting the Blue Play button CHECK. The red X will cancel the operation. 11. After selecting to continue the operation, the user will be advised that the CT is being demagnetized Figure 72: CT Demagnetizing Screen... -
Page 98: Step By Step Testing A Vt With Mrct
TOUCH connector clips or test leads while the MRCT is performing a test. Turn Power ON/OFF switch to ON. After the boot up, in the Home Screen first put the MRCT into voltage transformer mode by selecting the VT button. -
Page 99: Figure 73: Vt Ratio Test Screen
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. -
Page 100: Figure 74: Vt Ratio Test Connection Diagram
Hit Blue Play button to begin test The Ratio test will begin. Voltage (V): The MRCT displays the real time voltage readings of the primary while the test is in progress. Current (A): The MRCT the real time current readings for the primary while the test is in... -
Page 101: Figure 75: Vt Ratio Testing Screen
X Voltage (V): The MRCT the real time voltage readings of the secondary while the test is in progress. 18. At any point of time Test can be terminated by hitting the ABORT button at the top of the screen. -
Page 102: Testing Voltage Transformer Secondary Winding Resistance
TOUCH connector clips or test leads while the MRCT is performing a test. Turn Power ON/OFF switch to ON. 27. After boot up, in the Home Screen put the MRCT in voltage transformer testing mode by selecting the VT button. -
Page 103: Figure 77: Vt Winding Test Screen
30. After selecting the appropriate number of taps use the Winding Selector to select the appropriate winding to be tested 31. 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 Figure 78: VT Winding Resistance Connection Diagram... -
Page 104: Figure 79: Vt Winding Test Screen -Abort
while the test is in progress. X Current (A): The MRCT the real time DC current readings for the secondary X winding while the test is in progress. 35. At any point of time Test can be terminated by hitting the ABORT button at the top of the screen... -
Page 105: Self Test
Ground each terminal to be tested with a safety ground stick, before making connections. WARNING The MRCT produces high voltages and currents during the performance of tests. DO NOT TOUCH connector clips or test leads while the MRCT is performing a test. -
Page 106: Figure 81: Self Diagnostic Connection Diagram
Turn Power ON/OFF switch to ON. After the boot up, in the Home Screen select the “Self Diagnostic” button The following connection diagram will appear. Ensure the MRCT is connected properly Figure 81: Self Diagnostic Connection Diagram 6. During the Self Test, Secondary Current, Secondary Voltage and Primary Voltage will be displayed... -
Page 107: Figure 82: Self Diagnostic Test Screen
Figure 82: Self Diagnostic Test Screen 7. After the unit has checked the voltage and current generators and meters are working properly, the user will be advised the unit has passed or failed the test... - Page 108 Appendix Bushing CT’s can be tested in a de- energized circuit breaker which has been totally isolated from the power system. CT secondary leads will normally terminate in the control cabinet. Refer to the chart for connections.
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Page 109: Figure 83: Testing Bushing Ct Installed In A Power Transformer- A
Figure 83: Testing bushing CT installed in a Power Transformer- A Tests Set Connections CT Locations X1 X2 Jumpers H1 Bushing Secondary of H1 H1 Bushing H2 Bushing H2 - H3 CT located in X1 - X2 - X3 control cabinet H2 Bushing Secondary of H2 H2 Bushing... - Page 110 Bushing CT’s can be tested in a de- energized circuit breaker which has been totally isolated from the power system. CT secondary leads will normally terminate in the control cabinet. Refer to the chart on for connections.
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Page 111: Figure 84: Testing Bushing Ct Installed In A Power Transformer- B
Figure 84: Testing bushing CT installed in a Power Transformer- B Tests Set Connections CT Locations X1 X2 Jumpers X1 Bushing Secondary of X1 X1 Bushing Neutral Bushing H1 - H2 - H3 CT located in control cabinet X2 Bushing Secondary of X2 X2 Bushing Neutral Bushing...
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