Megger TTR300 Instruction Manual
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Megger TTR300 Instruction Manual

Megger TTR300 Instruction Manual

Transformer ratio test set
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TTR300_330A-UG-EN-V01
March 2018
Instruction Manual
for
Transformer
Ratio Test Set
TTR300
TTR330A
Catalog Number TTR300
Catalog Number TTR330A
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 TTR300_330A-UG-EN-V01 March 2018 Instruction Manual Transformer Ratio Test Set TTR300 TTR330A Catalog Number TTR300 Catalog Number TTR330A Read this entire manual before operating. Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403-2329 U.S.A. 610-676-8500 www.megger.com...
  • Page 3 Transformer Ratio Test Set TTR300/TTR330A...
  • 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

    5 GENERAL TESTING PROCEDURES ....................17   Site Preparation ............................... 17   Making Circuit Connections .......................... 17   Operating the TTR300/330A ........................19   6 THREE-PHASE Transformer RATIO TESTING ................... 21   Procedure ................................. 21   Test Form Controls - General ........................23  ...
  • Page 6   Bushing Current Transformer (BCT) Mounted on Three-Phase Transformers ........40   8 SAVE/RETRIEVE RESULTS ........................43   9 TTR300 – Self check ............................47   Reason for possible Inaccuracy in 1:1 Self Test: ..................47   Troubleshooting ............................... 48  ...
  • Page 7 List of Figures TTR300 Transformer Test Set ..........................v   TTR330A Transformer Test Set..........................v   Figure 1-1: TTR300 Front Panel ........................2     Figure 1-2: TTR330A Front Panel ........................2     Figure 1-3: TTR330A Industrial Controller with Display ................4  ...
  • Page 8 TTR300_330A-UG-EN-V01 March 2018...

  • Page 9: Upon Receipt Of Product

    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. TTR300 Transformer Test Set TTR330A Transformer Test Set...
  • Page 10 TTR300_330A-UG-EN-V01 March 2018...

  • Page 11: Product Overview 300/330A

    PRODUCT OVERVIEW TTR300/330A 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 50Hz input power supply, rather than the standard 60Hz supply.

  • Page 12: Top Panel Controls

    Top Panel Controls Figure 1-1: TTR300 Front Panel Figure 1-2: TTR330A Front Panel TTR300_330A-UG-EN-V01 March 2018...
  • Page 13 TTR3XX unit. Serial Connection (TTR300 only): This connection allows PC control of TTR300 using PowerDB Lite or PowerDB PRO software. Earth/Ground Lug This connection is used to connect a transformer under test to earth ground for safety.

  • Page 14: Ttr330A Top Panel Facilities

    The optional industrial 12 inch controller is: 1. Industrial 305 mm (12 inch) Touch Display: Used in place of a PC. Designed to run PowerDB Lite with focus on selected Megger instrument control related to transformer testing. When turned on, defaults to TTR transformer forms.
  • Page 15 Product Overview TTR300/330A 4. Rear USB Port Hub: Used for external Megger instrument control such as Delta4000, S1/MIT Insulation test set, MLR10. 5. Rear Ethernet Port: Used for external Megger instrument control – specifically the Delta4000, MTO250 and MTO3XX .
  • Page 16 TTR300_330A-UG-EN-V01 March 2018...

  • Page 17: Safety

    1983, IEEE Recommended Practices for Safety in High-Voltage and High-Power Testing, for additional information. General Safety Precautions The TTR300/330A and the Unit Under Test (UUT) should both be considered as sources of instantaneously lethal levels of electrical energy. Observe the following safety precautions: ...

  • Page 18: Input Power Precautions

    The voltage to ground from the live pole of the power source must be within the following rated operating voltage: Cat. No TTR300 108-132V/ 207-253V*, 60 Hz, ±2 Hz, 100VA Cat. No. TTR330A 108-132V/ 207-253V* 60 Hz, ±2 Hz, 100VA *- When a “-47”...

  • Page 19: Specifications

    SPECIFICATIONS Electrical Input Power Cat. No. TTR300 & 120/230 V, ±10%, 60 Hz, ±2 Hz, 100 VA TTR330A: IEC 1010-1 installation category II Cat. No. TTR300-47 & 120/230 V, ±10%, 50 Hz, ±2 Hz, 100 VA TTR330A-47: IEC 1010-1 installation category II...

  • Page 20: Test Frequency

    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 Turns 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 Deviation:...

  • Page 21: Measurement Method

    AS-2374, Part 4-2003 (Australian Standard) Measuring Time 8 to 50 seconds depending on mode of operation and type of transformer Display TTR300: Via external PC (user supplied) TTR330A: Size: 12 inch (305mm), Brightness: 1600 NIT, Operating Temp Range: -10C to +50C operation, Type: 4 wire resistive (touch)

  • Page 22: Physical Data

    Physical Data Dimensions: Instrument: 8.5 H x 21.5 W x 13 D in. (216H x 546.1 W x 330.2D mm) Case: 25H x 19W x 26D in. (635H x 483W x 660 D mm) Weight: Instrument with 28 lbs. (12.7 kg) standard provided accessories: 50 lbs.

  • Page 23: Software Installation

    PowerDB Lite Setup & Installation (PC Control only) PowerDB Lite software is included at no extra charge software tool that is designed specifically to control and/or extract data from the TTR300/330A. PowerDB Lite will present your test data into a professional looking data form that can be sent to a printer or .pdf file.

  • Page 24: Software Installation (Pc Portion Only)

    /PowerDBLite and download latest PowerDB Lite version available. NOTE: For TTR330A, software version is available, on request, from Megger Valley Forge Support Team. It will load onto the TTR330A via the USB memory port on the controller portion. The model is contained within the software and not obvious until PowerDB Lite software is loaded.
  • Page 25 Software Installation 3. Select Default Settings (Language and Units of Measure). 4. Install Shield Wizard will complete the installation of PowerDB Lite. Click Finish to close the installation program. 5. Installation of Optional Drivers. This may be requested at the end of installation, and if the TTR3XX is the only product to be used, no additional drivers should be required.
  • Page 26 TTR300_330A-UG-EN-V01 March 2018...

  • Page 27: General Testing Procedures

    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 TTR ground terminal directly to local station earth ground. Ensure that the transformer chassis also has a low impedance connection to local station earth ground potential.
  • Page 28 TTR300 RS232 connector on front panel to the PC /RS232 port. A standard RJ45 Ethernet cable will work for the TTR330A and a RS232 cable (provided) for the TTR300. Connect the PC output to the TTR300/330A at this time.

  • Page 29: Operating The Ttr300/330A

    General Testing Procedures Operating the TTR300/330A When testing high-voltage transformers, caution must be used at all times and all safety precautions followed. Read, understand, and employ all safety precautions and circuit connections described above and in Section 2 Safety. WARNING Ensure that the transformer to be tested is completely de-energized.
  • Page 30 TTR300_330A-UG-EN-V01 March 2018...

  • Page 31: Three-Phase Transformer Ratio Testing

    PROCEDURE: 1. TTR300/330A Start the PowerDB program. For detailed information on PowerDB, please refer to the PowerDB user manual and additionally the Help Screen for the software. The Help screen and PowerDB manuals will stay more up to date than this manual.

  • Page 32: Figure 6-2: Ttr300/330A Using Pc Software

    See Figures 6-1 & 6-2, above. Figure 6-3 Form Selection Table 3. TTR300/330A - Select the form desired for use. This manual employs form 3Ø Turns Ratio & Winding Resistance. 4. The form will be displayed and the user will be ready to start setting up the test process.

  • Page 33: Test Form Controls - General

    Three-Phase Transformer Ratio Testing Test Form Controls - General Once a form is opened, all forms have a set of standard controls which are available across the top of the form as shown below. This allows common functions such as saving, deleting, opening results, together with functions as described below.

  • Page 34: Figure 6-5: Nameplate Minimum Input

    2. Enter the transformer nameplate information. The required fields are highlighted below. Figure 6-5: Nameplate MINIMUM Input Figure 6-6: Nameplate Input Vector Selection: Once form setting (above) selects proper standard, one depresses the vector and a 'pop up' Vector Selector will appear, or 'right click' to select primary and secondary vector until it matches Transformer Nameplate.

  • Page 35: Transformer Test Conditions

    Three-Phase Transformer Ratio Testing vii. First/Last Tap Voltage: Required for calculation of expected voltages (and ratio) for each tap position as well as % Ratio Error Calculations. If tap voltages are unique (not evenly divided), this feature cannot be used, and user must enable “override calc voltages”...

  • Page 36: Figure 6-9: Settings Screen - Form Test Sections For Form Display

    Select Green Highlight from settings. Select Test Voltage. Auto voltage is default. Manual change available for 80/40/8 volts. Ratio Display: Defaults to TTR (most commonly used) and can be changed to “Transformer Nameplate Ratio”. Phase Display: Select in degrees or centiradians % Error: Sets maximum error (in %) versus nameplate ratio Override Calc Voltages: Enables operator to input unique nameplate tap voltages.

  • Page 37: Ratio Testing Methods

    Three-Phase Transformer Ratio Testing Ratio Testing Methods # Test: Depress to begin testing of individual row. This action will activate Test Dialog (Ratio Test) below ii. Tap Values: Are filled when Transformer Nameplate above is completed. Test Setup: Reflects input from Transformer Nameplate (5.) above and tap under test.
  • Page 38 TTR300_330A-UG-EN-V01 March 2018...

  • Page 39: Ratio Transformer Testing Applications

    RATIO TRANSFORMER TESTING APPLICATIONS The setup and connection instructions included in Section 7, herein, pertaining to ratio, polarity, phase relation and winding resistance, assume that the transformer under test, connections, and terminal markings comply with the requirements of ANSI C57.12.70-2011 American National Standards Terminal Markings and Connections for Distribution and Power Transformers or IEC 60076-1 Test Procedures for Power Transformers.

  • Page 40: Single-Phase, Two-Winding Transformers -Including Typical Pole Type Transformers With Dual Secondary's

    Single-Phase, Two-Winding Transformers –including Typical Pole Type transformers with Dual Secondary’s Perform the following setup procedure for single-phase, two-winding transformers. 1. Connect the heavy-duty clamps marked H1(1U) and H2(1V) & X1(2U) & X2 (2V) of the test lead to the corresponding (high-voltage and low-voltage windings) terminals of the transformer under test.

  • Page 41: Figure 7-2 Setup For Testing Single-Phase Autotransformer

    Ratio Transformer Testing Applications Figure 7-2 Setup for Testing Single-Phase Autotransformer (Vector Diagram 1P0) To test windings other than H1(1U) – H2 (1V) and X1(2U) – X2 (2V), ensure that the heavy-duty clamp marked H1(U1) is connected to the lower numbered terminal and H2(V1) to the higher numbered terminal of the high-voltage winding.

  • Page 42: Figure 7-3 Setup For Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator

    Figure 7-3 Setup for Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator (Vector Diagram VREG) Figure 7-4 Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator (Vector Diagram VREG) TTR300_330A-UG-EN-V01 March 2018...

  • Page 43: Figure 7-5 Connections To A Pole Type Transformer With 2 Secondary Windings

    Ratio Transformer Testing Applications Figure 7-5 Showing connections to a Pole Type Transformer with 2 secondary windings. To test with PowerDB requires choice of 1P0, with 2 taps, changing leads between tests. TTR300_330A-UG-EN-V01 March 2018...

  • Page 44: Three-Phase, Two-Winding Transformers

    Three-Phase, Two-Winding Transformers Perform the following setup procedure for three-phase, two-winding transformers. 1. Connect the clamps marked H0(1N), H1(1U), H2(1V), and H3(1W) of the test lead to the corresponding (HV winding) terminals of the transformer under test. Refer to Table 7-2 for Test Lead Markings. With delta connected windings, H0(1N) is not used.

  • Page 45: Figure 7-6 Typical Connection To A 2 Winding Ynyn Or Zigzag-8 Terminal Transformer

    Ratio Transformer Testing Applications NOTE: According to Australian standard, wye and delta transformer winding connections have a numerical suffix of 1 and 2. The zigzag transformers have a numerical suffix of 4. See Table A-3. Figure 7-6 Shows a Typical Connection to a 2 Winding YNyn or ZigZag –...

  • Page 46: Three-Phase, Three-Winding Transformers

    Three-Phase, Three-Winding Transformers This type of transformers has primary, secondary, and tertiary windings. Primary and secondary windings are tested as a regular three-phase, two-winding transformer. To test the tertiary winding, we connect to the primary and tertiary winding, and ignore the secondary winding during test procedure: 1.

  • Page 47: Current Transformers (Cts)

    Ratio Transformer Testing Applications Current Transformers (CTs) Connections to CTs are made backwards compared to power or potential transformers. The H(1) terminals on the test set must be connected to the X(2) terminals on the CT; and the X(2) terminals on the test set must be connected to the H terminals on the CT.

  • Page 48: Figure 7-8 Setup For Testing Unmounted Current Transformer

    3. As shown in Figure 7-8, connect the clamps marked X1(2U) and X2(2V) of the test lead to the respective H1(1U) and H2(1V) terminals of the CT. Ensure correct polarity. NOTE: 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 49: Bushing Current Transformer (Bct) Mounted On Single-Phase, Two-Winding Transformer

    Ratio Transformer Testing Applications Bushing Current Transformer (BCT) Mounted on Single-Phase, Two-Winding Transformer A turn-ratio and winding resistance test can be performed on a BCT after it has been mounted on a circuit breaker or power transformer entrance bushing. The test can be performed without removal of the BCT from the equipment.

  • Page 50: Bushing Current Transformer (Bct) Mounted On Three-Phase Transformers

    Bushing Current Transformer (BCT) Mounted on Three-Phase Transformers A turn-ratio test can be performed on all three BCTs using a single setup. Figure 7-11 shows the proper test connections when the BCTs are mounted on a typical delta winding and Figure 7-12 shows how when mounted on a typical wye winding.

  • Page 51: Figure 7-11 Setup For Testing Bct Mounted On Delta Winding On A Three-Phase Power Transformer

    Ratio Transformer Testing Applications Figure 7-11 Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power Transformer (Shorting only required during Ratio Test) – Use diagram YNyn0 TTR300_330A-UG-EN-V01 March 2018...

  • Page 52: Figure 7-12 Setup For Testing Bct Mounted On Wye Winding Of A Three-Phase Transformer

    Figure 7-12 Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer (Shorting only required during ratio test) –Vector diagram YNyn0 TTR300_330A-UG-EN-V01 March 2018...

  • Page 53: Save/Retrieve Results

    SAVE/RETRIEVE RESULTS While testing, it is critical that results are saved as testing is performed. In order to enable this ability, PowerDB automatically requests a file name each and every time a test result is obtained UNTIL such time as a file name is entered for the result.
  • Page 54 In order to rename a test file (result) user has the option to save result under a different name, as a template or as a PDF (original test file remains unchanged). Results can be also printed by depressing print icon. Retrieving Results/Test Files There are 2 ways to retrieve results and or test files.
  • Page 55 Save/Retrieve Results Once TTR instrument is selected, user can open saved result to view results and/or to retest/append results, or use present form as a template (once settings are entered into form). TTR300_330A-UG-EN-V01 March 2018...
  • Page 56 TTR300_330A-UG-EN-V01 March 2018...

  • Page 57: Ttr300 - Self Check

    TTR3XX – SELF CHECK A customer may want to make sure that the test set is functioning properly before testing a transformer. This test is conducted using an accessory (Cat No. 2005-249) provided with the TTR unit. The 1:1 turns ratio and phase deviation can be validated as an approximate accuracy and functional CHECK.

  • Page 58: Troubleshooting

    transformer turns ratio test. Due to the intrinsic and inevitable impedance mismatching, the 3-phase TTR functional test readings may be from 0.9980 to 1.0020. The TTR functional test readings do not represent its calibration. It simply shows that the TTR test set circuitry functions properly. To check the 3- phase TTR calibration, a customer should use certified Calibration Standards.
  • Page 59 TTR300 – Self Check MALFUNCTION POSSIBLE CAUSE  Defective test leads (open circuit, poor RATIO and/or Iexc (mA) readings erratic. connection).  Severe abnormal transient in service power.  Problem in test specimen (poor connection).  Problem in measuring circuit.
  • Page 60 TTR300_330A-UG-EN-V01 March 2018...

  • Page 61: Ordering Information / Spare Parts

    USB Memory stick contains: PDF manual, PowerDB Lite software 1010-941 and related documents OPTIONAL ACCESSORIES Universal lead sets, compatible with Megger TTR3XX Series products (up to 10 A DC max) 3-phase, 4-wire shielded test leads (H&X), complete with color coded universal Kelvin clamps 2008-30-KIT 3-Ø...
  • Page 62 3-ø Universal, 30 m (100 ft), H 2008-113-100 3-ø Universal, 30 m (100 ft), X 2008-114-100 Transit case for instrument leads and accessories TTR300/330A 2005-340 Remote tap controller, manual operation, model RTC-1, complete 1007-502 with quick guide, and red/black/white (total 3) alligator clips...

  • Page 63: Service

    SERVICE Maintenance Maintenance should be performed only by qualified persons familiar with the hazards involved with high-voltage test equipment. Read and understand Section 2, Safety, before performing any service. Routine maintenance is required for the TTR test set. The appearance of the TTR test set can be maintained by occasionally cleaning the case, panel and cable assemblies.

  • Page 64: Calibration

    To replace fuse(s), proceed as follows: 1. Disconnect the power cord from the TTR test set. 2. Using a small flathead screwdriver, carefully remove the fuse holder of the input power module installed on the right side of the TTR test set front panel.

  • Page 65: Repairs

    In the event that 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 66 TTR300_330A-UG-EN-V01 March 2018...

This manual is also suitable for:

Ttr330a

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