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MEWOI -UCT-C User Manual

Transformer turn ratio tester
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Transformer Turn Ratio Tester
MEWOI-UCT-C
User Manual
www.mewoi.com

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Summary of Contents for MEWOI MEWOI-UCT-C

  • Page 1 Transformer Turn Ratio Tester MEWOI-UCT-C User Manual www.mewoi.com...

  • Page 3: Table Of Contents

    CONTENT Warning ....................1 I . Brief Introduction ................3 II. Main Features .................. 3 III. Technical Specification .............. 4 Structure ..................5 Operating Interface and Operating Method ......7 Power On/Off ..................7 3. Single-phase transformer or PT transformer measurement ..9 4.

  • Page 4: Warning

    Warning Thanks for your purchase of Transformer Turn Ratio Tester MEWOI-UCT-C of our company. In order to make better use of this product, please make sure to: ——Read this manual in detail and the operator must totally understand this manual and be in proficient in operation of this meter before making test on spot.

  • Page 6: Brief Introduction

    It needs necessary conversion, and the test results only reflect one-phase ratio. MEWOI-UCT-C Transformer Turn Ratio Tester overcomes the shortcomings of the traditional bridge test, completes the three-phase ratio test at one time, has fast test speed and high accuracy, and greatly improves the test efficiency.

  • Page 7: Technical Specification

    10,Both AC and DC power supply methods are available, can be used with or without city power. 11, Small size and light weight. III. Technical Specification 0.9~10000 Measure Range 0.1%± 2 words (below 500); Accuracy 0.2%± 2 words (500~2000); 0.3%± 2 words (2000~4000); 0.5% ±...

  • Page 8: Structure

    IV. Structure 1. Instrument switch: Select the power supply mode of the instrument and start it. －：Selection of AC power supply mode and start-up ○：Instrument shutdown; ＝：Selection of DC power supply mode and start-up. 2. AC～220V:Power Socket; please connect AC power supply AC 220V + 10%, 50HZ.
  • Page 9 transformer. 5. Display: 240×128 dot matrix LCD with led backlight, display operation menu and test results. 6. Battery power indicator: When choosing DC mode of operation, display the remaining power of instrument battery. 7. Buttons: F1,F2 Function Key: Indicate different functions according to interface prompt during instrument operation Reset Button: Press this button to reset the whole machine and return to its original state.

  • Page 10: Operating Interface And Operating Method

    and the instrument. 10. Charging port: When the instrument shows that the battery power is low (not less than 10%) or when the instrument is not used for a long time, the battery of the instrument should be charged through the charging interface. 11.
  • Page 11 AC or DC power supply mode can be selected to supply power to the instrument, AC power supply mode: set the instrument switch to the "-" position (AC position), and the instrument is turned on. DC power supply mode: set the instrument switch to the "=" position (DC position), and turn on the instrument.

  • Page 12: Single-Phase Transformer Or Pt Transformer Measurement

    ← or → By pressing the button, the cursor can move in circles between the parameters, and it can move the cursor to the parameters that need to be changed. ↑ or ↓ Press the button, Can change the current parameters ,can change the high-voltage mode.
  • Page 13 Press the OK button to modify the parameters, the high voltage mode selects “Single”, other modifications based on actual values. After parameter modification is completed, press the Return button to exit the modification interface. After confirming the connection is correct, press the F1 button to test and show the "Testing"...

  • Page 14: Measurement Of Three-Phase Transformer

    Press F1 button to "retest" and F2 button to "Save" ,press Print button to print test results. 4. Measurement of three-phase transformer High voltage end: The yellow, green and red clamps correspond to the A, B,C phase of the transformer high voltage end respectively.

  • Page 15: Nameplate Guess Instructions

    correct, press the F1 button to test and show "testing…" and the test results displayed later, as shown in the following figure: Press F1 button to "retest" and F2 button to "store" ,press Print button to print test results. 5. Nameplate Guess Instructions If the nameplate parameters of three-phase transformer are not clear, the instrument can accurately measure the ratio and group number of transformer, but cannot accurately...

  • Page 16: Store And Access Data

    Note: At this time, only the variable ratio and group number are accurate. Because other parameters are not clear and accurate values cannot be set, the turn ratio, error, tap value and connection mode displayed are not accurate data and cannot be used as reference.

  • Page 17: Time Setting

    instrument, press the F2 button in the initial interface, the screen will display as shown below: Press UP or Down to turn the page, press Print button to print the current data, press F1 key to delete the current record, press F2 button to delete all records. 7.

  • Page 18: Operation Examples

    UP or Down key to modify the number, press the OK button to exit after the modification, and return to the initial interface. VI. Operation Examples The three-phase transformer brand data is as follows: Wiring according to the three-phase transformer wiring method (Please refer to the measurement of V.4 three-phase transformer).
  • Page 19 2,Rated transformation ratio: (according to the middle position of the high voltage end: 2 tap) The high voltage end voltage value is 10000, the low voltage end voltage is 400, and the rated transformation ratio calculated 10000/400=25.Input rated ratio 25; 3, Total number of taps: The switch position shows three high voltage values of 10500,1000,9500, so there are 3 taps 4, Tap spacing: (10500-10000) / 10000 = 5%.

  • Page 20: Instrument Self-Checking

    You can press F1 to retest, press F2 to store the data, press Print to print data, Reset returns to the main menu. VII. Instrument Self-Checking If the user suspects that the instrument is malfunctioning or that the test results are inaccurate, the instrument can be self-checked with the standard short wiring equipped with the instrument.

  • Page 21: Battery Charging Instructions

    The A/B/C three-phase data to the ratio is 1.0000±2‰, indicating that the instrument is in a normal state and can be used continuously. VIII. Battery Charging Instructions When the instrument is not used for a long time or the DC power supply is used for a period of time, it will cause insufficient power, so it is necessary to recharge the instrument battery.

  • Page 22: Accessories

    IX. Accessories Ratio Tester Test Line 1set Three Cores Power Cord Standard Short 3pcs Wiring(Self-checking) Grounding Wire Fuse 2pcs Printer Paper 2Rolls Charger User Manual X. Matters Needing Attention 1, For transformers with 19 gears of on-load tap-changer, 9, 10 and 11 taps are the same value.
  • Page 23 esting pecialist...

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