Megger TTR320 Series Instruction Manual
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Megger TTR320 Series Instruction Manual

Three-phase turn ratio test set
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AVTMTTR320-EN
Rev A
October 2008
Instruction Manual
for
®
Three-Phase TTR
Transformer Turn Ratio Test Set
TTR320 series
Catalog Numbers. TTR320, TTR320-47
HIGH-VOLTAGE EQUIPMENT
Read this entire manual before operating.
M
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403-2329
U.S.A.
610-676-8500
www.megger.com

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  • Page 1 AVTMTTR320-EN Rev A October 2008 Instruction Manual ® Three-Phase TTR Transformer Turn Ratio Test Set TTR320 series Catalog Numbers. TTR320, TTR320-47 HIGH-VOLTAGE EQUIPMENT Read this entire manual before operating. Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403-2329 U.S.A.
  • Page 3 ® Three-Phase TTR Transformer Turn Ratio Test Set TTR320 series...
  • Page 4 Specifications are subject to change without notice. WARRANTY Products supplied by Megger are warranted against defects in material and workmanship for a period of one year following shipment. Our liability is specifically limited to replacing or repairing, at our option, defective equipment.

  • Page 5: Table Of Contents

    Table of Contents 1. Getting to know the TTR320 ..........................1 Product Overview ..............................1 User Interface Panel.............................4 Communications ports ............................5 HOME Action Icons............................5 Utility Icons................................6 2. Safety ..................................7 Safety is the responsibility of the user .......................7 Input Power precautions .............................8 3. PREPARING FOR TEST ..........................9 Site Preparation..............................9 Making Circuit Connections ..........................9 4.
  • Page 6 List of Figures TTR320 Transformer Turn Ratio test set......................iii Figure 1-1. Top Panel Controls ..........................3 Figure 1-2. User Interface Panel..........................4 Figure 1-3. Communications ports ........................5 Figure 1-4. HOME Action Icons..........................5 Figure 1-5. Utility Icons............................6 Figure 4-1. Setup for Testing Single-Phase Transformer................12 Figure 4-2.

  • Page 7: Ttr320 Transformer Turn Ratio Test Set

    Prior to operation, check for loosened hardware or damage incurred during transit. If these conditions are found, a safety hazard is likely, DO NOT attempt to operate equipment. Please contact Megger as soon as possible. TTR320 Transformer Turn Ratio test set...
  • Page 8 AVTMTTR320-EN Rev A Oct 2008...

  • Page 9: Getting To Know The Ttr320

    Getting to know the TTR320 Product Overview The Three-Phase TTR® Test Set is fully automatic, self-checking, menu-driven unit. The test set measures the turn ratio, phase shift, and excitation current of power, distribution, and instrument transformers. A “-47” suffix added to the catalog number denotes a 230-V input power supply, rather than the standard 120-V supply.
  • Page 10 Checking reverse polarity at start of each test. Via ethernet port, an external PC or laptop can be connected to operate the TTR (in remote control mode) or to transfer test results and to provide full transformer test report. Quick test mode provides the fastest testing of a transformer. Three excitation test voltages: 80 V, 40 V, and 8 V.

  • Page 11: Figure 1-1. Top Panel Controls

    Getting to Know the TTR320 Top Panel Controls Figure 1-1. Top Panel Controls 1. Power input receptacle, ON/OFF switch, and fuse holder. ON/OFF power switch and input power receptacle provides power to the test set. 2. Emergency OFF switch. This red push button interrupts testing. When pressed, the switch is locked in off position.

  • Page 12: User Interface Panel

    User Interface Panel Test Button: Initiates and Terminates Testing Navigation Keys: Use Arrow keys to highlight a desired Selection. Use Enter button (in center) to Activate the Selection. Home Key: Toggles HOME Action Icons Zone Key: Allows User to select Active area of the screen. Keypad: Key board for entering notes and data.

  • Page 13: Communications Ports

    Select to RECALL test Select to SAVE Test. Print Icon. Prints the Selected Test data. Printer driver is factory installed. Please contact Megger for specific printer model availability. Select to enter PREFERENCES screen Figure 1-4. HOME Action Icons AVTMTTR320-EN Rev A Oct 2008...

  • Page 14: Utility Icons

    Utility Icons Delete Icon. Deletes the Selected File or Report. Print Icon. Prints the Selected Report. Printer must be standard USB supporting HP PCL protocol. USB Out Icon. Select to Transfer Files or Reports from external USB Memory Stick to the TTR. USB In Icon.

  • Page 15: Safety

    Instruction Manual and attend the equipment while the equipment is in use. In the event of equipment malfunction, the unit should immediately be de- energized and returned to Megger for repair. The Safety precautions herein are not intended to replace your Company’s Safety Procedures. Refer to IEEE 510 - 1983, IEEE Recommended Practices for Safety in High-Voltage and High- Power Testing, for additional information.

  • Page 16: Input Power Precautions

    made and the last removed. Any interruption of the grounding connection can create an electrical shock hazard. Personnel using heart pacemakers should obtain expert advice on the possible risks before operating this equipment or being close to the equipment during operation. Input Power precautions This instrument operates from a single-phase, sine wave, power source.

  • Page 17: Preparing For Test

    Making Circuit Connections Connections should be made in the order as listed below. 1. Ground. Use the Megger supplied Safety Ground Cable 15 ft (4.6 m) to connect the TTR320 Wing Nut Ground Terminal directly to Local Station Earth ground. Ensure the Transformer chassis also has impedance continuity to Local Station Earth ground potential.
  • Page 18 4. Connect the Ethernet cable (optional). If the user chooses to operate the TTR320 in a remote-control mode, using PowerDB PC software, then connect the Ethernet cable between the TTR320 and the PC at this time. 5. Connect the Load-Tap-Changer cable (optional). If the user chooses to operate the “Test button”...

  • Page 19: Connecting To The Transformer

    Connecting to the Transformer The setup and connection instructions included in Section 4 herein, pertaining to ratio, polarity, and phase relation, assume that the transformer under test, connections, and terminal markings comply with the requirements of ANSI C57.12.70-1990 American National Standards Terminal Markings and Connections for Distribution and Power Transformers.

  • Page 20: Figure 4-1. Setup For Testing Single-Phase Transformer

    2. Connect the H and X test cables to the respective H and X receptacles of the TTR320. Make sure that the connectors are securely fastened (using clockwise rotation) to the receptacles. 3. Connect the heavy-duty clamps marked H1 and H2 of the test lead to the corresponding (high-voltage winding) terminals of the transformer under test.

  • Page 21: Figure 4-3. Setup For Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator

    Connecting to the Transformer higher numbered terminal of the high-voltage winding. Similarly, X1 and X2 should be connected to the low-voltage winding. Test lead markings for the ANSI, CEI/IEC, and Australian standards are as shown in Table 4-1. Table 4-1. Test Lead Markings for Single-Phase Transformers Test Lead Marking Transformer Heavy-Duty...

  • Page 22: Three-Phase, Two-Winding Transformers

    Figure 4-4. Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator Three-Phase, Two-Winding Transformers Perform the following setup procedure for three-phase, two-winding transformers: 1. With the ON/OFF Switch in the OFF position, make the circuit connections as described in Section 3.2. 2.

  • Page 23: Three-Phase, Three-Winding Transformers

    Connecting to the Transformer 5. On/OFF Switch. It is only after all of the above connections are safely made and all safety precautions of sections 2 and 3 are satisfied, should the On/OFF switch be turned to the ON position. Table 4-2.

  • Page 24: Current Transformers (Cts)

    and Y3) of the transformer under test. Refer to Table 4-2 for test lead markings. With delta connected windings, X0 is not used. With wye connected windings, a neutral connection for X0 is normally available. 5. On/OFF Switch. It is only after all of the above connections are safely made and all safety precautions of sections 2 and 3 are satisfied, should the On/OFF switch be turned to the ON position.

  • Page 25: Figure 4-5. Setup For Testing Unmounted Current Transformer

    Connecting to the Transformer 3. As shown in Figure 4-5, connect the heavy-duty clamps marked H1 and H2 of the test lead to the respective X1 and X2 terminals of the CT. Note that the H and X leads are connected in reverse as compared to the Single and Three phase Transformer testing described in the previous sections.

  • Page 26: Figure 4-6. Setup For Testing Taps On Multiple Tap Ct

    Figure 4-6 shows the setup for testing the taps on a multiple-tap CT. Figure 4-6. Setup for Testing Taps on Multiple Tap CT Bushing Current Transformer (BCT) Mounted on Single-Phase, Two-Winding Transformer A turn-ratio test can be performed on a BCT after it has been mounted on a circuit breaker or power transformer entrance bushing.

  • Page 27: Bcts Mounted On Three-Phase Transformers

    Connecting to the Transformer Check to make sure that the BCT is mounted with proper polarity with respect to power transformer entrance bushing and that connection polarities are correct. Figure 4-7. Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer BCTs Mounted on Three-Phase Transformers A turn-ratio test can be performed on all three BCTs using a single setup.

  • Page 28: Figure 4-8. Setup For Testing Bct Mounted On Delta Winding -Three-Phase Power Transformer

    connection polarities are correct. Make connections as shown in figure 4-8 for delta winding configurations and figure 4-9 for wye winding configurations. Figure 4-8. Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power Transformer AVTMTTR320-EN Rev A Oct 2008...

  • Page 29: Figure 4-9. Setup For Testing Bct Mounted On Wye Winding Of A Three-Phase Transformer

    Connecting to the Transformer Figure 4-9. Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer AVTMTTR320-EN Rev A Oct 2008...

  • Page 30: T-Type Transformers

    T-Type Transformers T-type transformers represent a special type of thee-phase transformer. This transformer may be tested as a single phase transformer. In this case, the jumpers indicated in Table 4-3 should be applied to the appropriate terminals of the T- type transformers.

  • Page 31: Operation

    Operation Power up Proceed only after reading and fully reading and understanding Sections 2, 3, and 4 herein, with particular attention on the Safety related precautions. Once all Safety precautions are taken, and all circuit connections are made, then the user may safely turn the ON/OFF switch to the ON position and operate the test instrument as described herein.

  • Page 32: Figure 5-1 Cleared Test Screen

    Action Icons: Select NEW TEST to clear Test screen Figure 5-1 Cleared Test screen AVTMTTR320-EN Rev A Oct 2008...

  • Page 33: Figure 5-2 File Manager -Recall Test

    Operation Select Recall to open test from memory (either internal or USB memory) Use Zone Key to move cursor to various zones on display Figure 5-2 File Manager -Recall Test Select SAVE to save test to memory AVTMTTR320-EN Rev A Oct 2008...

  • Page 34: Figure 5-3. File Manager -Save Test Screen

    Figure 5-3. File Manager –SAVE Test screen Select to define Tap Structure Figure 5-4 Tap Structure - Define AVTMTTR320-EN Rev A Oct 2008...

  • Page 35: Figure 5-5 Global Settings - Preferences Screen

    Operation Select PREFERENCES to set global parameters Figure 5-5 Global Settings – Preferences screen Owner: User specified field Serial Number of Test Instrument Language: Indicates displayed language Save File Prefix: All Saved files will begin with this prefix % Error Limit: User set % error limit (Ratio) Test voltage: Default test signal voltage level...

  • Page 36: Remote Control Operation For Ltc Testing

    TTR, allowing you to stay close to an LTC, change taps, and initiate the test routine. Connect the hand-held control unit, Megger p/n 30915-220, to the Remote Trigger Receptacle port of the TTR. The remote control unit pushbutton lamp will illuminate.

  • Page 37: Upon Completion Of Test - Powering Down

    Operation PHASE A (or B, or C) TURNS RATIO TOO HIGH This message shows that a transformer under test turn ratio is higher than 10,000 (if 80 V or 40 V is used) or is higher than 4,000 (if 8 V is used). The message may be caused by poor connection of one of the test leads, as well.
  • Page 38 AVTMTTR320-EN Rev A Oct 2008...

  • Page 39: Service

    Service Maintenance Maintenance should be performed only by qualified persons familiar with the hazards involved with high-voltage test equipment. Read and understand Sections 2, 3, 4, and 5 before performing any service. The TTR320 requires only periodic inspection. Periodically, inspect all hardware items, including the cable assemblies, to ensure all is in good condition.

  • Page 40: Calibration

    To check the 3-phase TTR calibration at a customer site or in the field, the Megger Calibration Standard Cat.No550055 or equivalent standard should be used. To perform a quick simplified calibration check, the Megger Calibration Standard CatNo550555 may be used. The last standard has eleven switchable turns ratio settings which cover the turns ratio range from 1:1 to 2000:1.
  • Page 41 Service To perform a 3-phase TTR functional test proceed as follows: 1. Turn TTR test set power off. 2. Connect H1 lead to X1 lead, H2 lead to X2 lead, H3 lead to X3 lead, and H0 lead to X0 lead. Make sure the leads are properly connected and that H/X pairs are not electrically in contact with each other.

  • Page 42: Troubleshooting

    Troubleshooting The Troubleshooting Guide, Table 6-1, is arranged to help you evaluate the reasons for TTR test set malfunction. The table lists possible test set malfunctions which may be encountered during operation and lists possible causes. Electronic circuit repairs should not be attempted in the field. Refer to Repair section.

  • Page 43: Repairs

    In the event Service is required, contact your Megger representative for a product Return Authorization (RA) number and shipping instructions. Ship the product prepaid and insured and marked for the attention of the Megger Repair Department.
  • Page 44 AVTMTTR320-EN Rev A Oct 2008...

  • Page 45: Replacement Parts List And Optional Accessories

    Replacement Parts List and Optional Accessories Table 7-1. Replacement Parts List Item Cat. No. Three-phase Transformer Turns Ratio Test Set 120 V ac ±10%, single phase, 50 ±2 Hz or 60 ±2 Hz, 100 VA TTR320 230 V ac ±10%, single phase, 50 ±2 Hz or 60 ±2 Hz, 100 VA TTR320-47 Included Accessories Canvas carrying bag for test leads...
  • Page 46 3-ø shielded test lead set, X and H winding, 50 ft (15 m) 37094 1-ø shielded test lead set, X and H winding, 30 ft (9.1 m) 37095 3-ø lead set adapter to allow use of Megger TTR C/N 550503 lead set (30915-xxx) 37087 Software...

  • Page 47: Specifications

    Specifications Electrical Input Power Cat. No. TTR320: 120 V ac ±10%, single phase, sine, 50 ±2 Hz or 60 ±2 Hz, 100 VA, IEC 1010-1 installation category II Cat. No. TTR320-47: 230 V ac ±10%, single phase, sine, 50 ±2 Hz or 60 ±2 Hz, 100 VA, IEC 1010-1 installation category II Protective Devices Fuses (2)*:...
  • Page 48 Test Frequency Same as line frequency. Loading of Test Transformer Less than 0.2 VA Measuring Ranges 80 V ac: 0.8 to 45,000, 5 digit resolution Turn ratio: 40 V ac: 0.8 to 25,000, 5 digit resolution 8V ac: 0.8 to 8,000, 5 digit resolution Excitation Current: 0 to 500 mA, 3 digit resolution Phase Angle...

  • Page 49: Environmental Conditions

    Service Measurement Method In accordance with ANSI/IEEE C57.12.90 Transformer Winding Phase Relationship ANSI C57.12.70-1990 CEI/IEC 76-1:1993 and Publication 616:1978 AS-2374, Part 4-1997 (Australian Standard) Measuring Time 10 to 20 seconds depending on mode of operation and type of transformer Display 5.7 inch, full VGA color display Memory Storage Internal and USB memory device: Over 1000 test results (depending on size)
  • Page 50 AVTMTTR320-EN Rev A Oct 2008...

  • Page 51: Addendum A Ttr 300 Series Powerdb Lite User Manual

    Introduction PowerDB Lite is a free, but limited capability, version of the PowerDB software tool that is designed specifically to control and/or extract data from Megger instruments. The primary difference between PowerDB Lite and PowerDB is that PowerDB is designed to work with all manufacturers’ equipment and has field and office synchronization capabilities.
  • Page 52 Deficiency Summaries Allows All Of Your Field Test Data To Be Integrated With CMMS Systems Such As Maximo or SAP Imports >From Many Other Industry Standard Software Applications Controls and Imports Data From Many non-Megger Instruments AVTMTTR300 Rev A Oct 2008...
  • Page 53 TTR Series PowerDB Lite User Manual Software Installation To install PowerDB Lite, load the PowerDB Lite CD into your CD-ROM drive and follow the on-screen instructions. 1. Accept the terms of the License agreement. 2. Choose the destination location for the PowerDB Lite files. AVTMTTR320-EN Rev A Oct 2008...
  • Page 54 3. Select Default Settings. 4. InstallShield Wizard will complete the installation of PowerDB Lite. Click Finish to close the installation program. AVTMTTR300 Rev A Oct 2008...
  • Page 55 TTR Series PowerDB Lite User Manual Using PowerDB Lite 1. Home Select your Instrument from the Instrument Setup screen. a. You can always view the Instrument Setup screen from the Tools menu or F3. b. Select the appropriate row in the Description column. Then click the “...”...
  • Page 56 Verify that the baud rate is set to 9600, Parity is set to none, Byte Size is set to 8, and Stop Bits is set to 1. d. Only check ‘Use Ethernet’ if connected to the TTR320. If you leave the IP address blank PowerDB Lite will discover the unit.
  • Page 57 TTR Series PowerDB Lite User Manual 3. Enter Test Data a. Header and nameplate information can be manually typed into a form. b. Click the Initialize Instrument button to initialize the test set. c. Form fields with automation will now be colored cyan. Right-clicking these fields will start the test.
  • Page 58 d. To change the settings of the TTR place the mouse on the form and right-click. Then select “TTR Settings”. e. This dialog box allows you to change the TTR settings. The settings that can be changed are as follows: 1.
  • Page 59 TTR Series PowerDB Lite User Manual 5. Comments and Deficiencies When imported into the full version of PowerDB, the comments and deficiencies on each form are used to generate summary reports. These summary reports repeat the notations and lists the page number where reported. This allows the user to scroll to a particular page to view a reported anomaly.
  • Page 60 7. Opening an Existing File a. Select the File> Open menu item. b. Browse to the file you would like to open. c. Press the Open dialog button. d. If the file contains multiple test dates, select the date that you would like to open for editing or select New to append a new set of results to the file.
  • Page 61 TTR Series PowerDB Lite User Manual 8. Loading Data Files When testing with the TTR 320 or TTR 320 you may load files saved on the instrument’s USB drive. Refer to Step 7 for instructions on selecting and opening files. 9.
  • Page 62 10. How to change Languages a. Select the Tools>Options menu item. b. Select the appropriate language in the dropdown menu. 11. How to change units of measurement a. Select the Tools> Options menu item. b. Select the units in the drop down Default Units under Measurements AVTMTTR300 Rev A Oct 2008...
  • Page 63 TTR Series PowerDB Lite User Manual 12. Additional Notes a. Additional forms can be filled out by repeating steps 2, 3 and 6. b. Forms can be printed with the File>Print menu item, or type CTRL+P, or press the Print toolbar button. c.
  • Page 64 Specific Form Help Instructions Operating Instructions for the Multiple Quick Test Form a. Type in the asset ID and then press the Enter key. b. Use the left and right arrow keys to select the high-side winding configuration. c. Press the Enter or Tab key. d.
  • Page 65 TTR Series PowerDB Lite User Manual Operating Instructions for the Simple 3PH TTR Form This form can be used for testing a two or three winding transformer with multiple taps on one or more of the windings. If you are testing a three winding transformer please check the “Has Tertiary” checkbox.
  • Page 66 AVTMTTR300 Rev A Oct 2008...
  • Page 67 TTR Series PowerDB Lite User Manual Operating Instructions for the 3PH TTR with TAP Changer Form The procedure for this form is the same as the Simple TTR form. The only difference is that it allows the user to enter additional nameplate information. AVTMTTR320-EN Rev A Oct 2008...
  • Page 68 AVTMTTR300 Rev A Oct 2008...

This manual is also suitable for:

Ttr320Ttr320-47

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