Category: Transformer Turns Ratio Testers

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Transformer Turns Ratio Testers

Transformer Turns Ratio Testers measure transformation ratio, phase error & magnetizing current of transformers for single/three-phase, power/distribution.

Turns Ratio Tester | TRT Advanced Series
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Turns Ratio Tester - Overview

TRT advanced series are true three-phase, fully automatic test devices specially designed for turns ratio, phase shift, and excitation current measurements of power, distribution, and instrument transformers. It determines the transformer turns ratio by applying voltages across high-voltage windings, accurately measuring voltages across the unloaded transformer windings, and then displaying the ratio of these voltages. The test set can be used to test single-phase and three-phase transformers, both with and without taps in accordance with the requirements of the IEC 60076-1 standard. It has a very high ability to cancel electrostatic and electromagnetic interference in HV electric fields.

Turns Ratio Tester - Features
- Automatic vector group detection
- Built-in tap changer control unit
- Interchangeable test leads with Three-phase Winding Ohmmeters & Tap Changer Analysers TWA Series
- Single-phase test voltages up to 500 V AC
- True three-phase test voltages up to 3x290√3V AC
- Up to 5 kV AC with additional CVT20 for testing capacitive voltage transformers
- The best turns ratio accuracy of 0.03% • Large 10.1” or 7” graphical touch screen display
https://www.youtube.com/watch?v=V8ktNqs6SPE

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Three-Phase Transformer Turns Ratio Tester | TRT Std Series
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Three-Phase Transformer Turns Ratio Tester - Overview

The TRT Standard series offers advanced instrumentation which includes LCD displays. Each model measures transformer excitation current and phase shift and performs automatic vector group detection and magnetic balance on three-phase transformers and three-phase autotransformers. They have built-in true three-phase power sources which equip test transformers with special configurations, such as phase-shifting, rectifiers, arc-furnace, traction transformers, etc. The instruments can output test voltages from 1 V AC to 250 V AC, depending on the chosen model. A high test voltage of 250 V AC provides more accurate turns ratio testing compared to other turns ratio testers on the market, with an extremely low test voltage of 1 V AC enables turns ratio verification of current transformers. Applications include: turns ratio measurement, turns ratio deviation calculation, excitation current measurement, phase angle measurement, automatic vector group detection, verification of demagnetisation process and magnetic balance testing.

TRT03 Models (TRT03A, TRT03B, TRT03C) – single-phase voltage up to 100 V
TRT33 Models (TRT33A, TRT33B, TRT33C) – single and true three-phase voltage up to 100 V
TRT63 Models (TRT63A, TRT63B, TRT63C) – single and true three-phase voltage up to 250 V

Three-Phase Transformer Turns Ratio Tester - Features
- True Three-Phase Test Voltage TRT (except TRT03)
- Highest accuracy for turns ratio, excitation current, and phase angle
- High measurement resolution
- Interchangeable cables with TWA
- Automatic Vector Group Detection
- Built-in Tap Changer Control Unit
- DV-TR software is included
- Magnetic Balance Test
- Memory store 200 test records. Each consists of 50 test readings
- USB Flash Drive
- Optional Built-in Printer
https://www.youtube.com/watch?v=aUJ0BNudhI4&t=17s

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4
Winding Resistance and Turns Ratio Meter | MRC7300A
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Winding Resistance & Turns Ratio Meter - Overview

This instrument can precisely and safely determine winding resistances, transformation ratios, and phase angles of distribution transformers up to 100MVA and more. Further, it is possible to automatically move the tap charger of the H.V. winding to the next tap and perform cool-down measurements in temperature rise tests to calculate the resistance in the case of a load disconnection. The Winding Resistance & Turns Ratio Meter MRC7300A can be used by transformer manufacturers, electricity supply companies, and repair companies which carry out on-site measurements under unfavourable conditions. Resistance values ranging from 50 µΩ to 500 µΩ can easily be measured and logged with the internal measuring current of a maximum of 15 A up to a power of Approx. 100 MVA and more. To allow a comparison of the measured values to previous measurements, a conversion of the temperature of the test object is provided to compare measurements of a detached transformer carried out in winter and measurements carried out in other seasons. The measuring range is between 0.9:1 and 2500:1 in the case of the transformation ratio; the resolution of the angle measurement is 0.1 degrees. The logging of all measured values is performed by a separate printer, computer, or via the internal memory. The magnetic loading of the transformer is performed quickly to a relatively high rating voltage (50V). The unloading of the core is very safe, as the energy is dissipated in the MRC7300A by a ballast resistor and varistors except for a negligible rest.

Winding Resistance and Turns Ratio Meter- Features
- Automatic measurement without any manual interaction
- Resistance measurement with high accuracy and up to 15 A current
- Ratio measurement including phase angle and magnetizing current
- Dual measuring method for faster measurements
- Automatic vector group detection
- Tap changer control measures all transformers tap automatically
- Heat-up measurement including an algorithm for resistance at t=0
- Temperature measurement and compensation to 20 °C for Cu or AI
- USB port to get full external control over the instrument
- Thermo printer
Datasheet

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Battery Operated Transformer Ratio Meter | PWR1-3B
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Battery Operated Transformer Ratio Meter - Overview

The Battery-Operated Transformer Ratio Meter PWR1-3B is a battery-powered instrument that can also be driven by normal line voltage. It is designed to measure transformation ratio, phase error, and magnetizing current of power and distribution transformers for all three-phases simultaneously. Voltage and current transformers are single-phase, power transformers normally are three-phase. Due to the bad quality of industrial lines (phase jitter and shifting, voltage differences between the three phases) all measurements normally are done in single-phase, even on three-phase ratiometers. The design of the PWR1-3B contains an internal sinus power oscillator which delivers the necessary exciting voltage with very low distortion and stable voltage not found in industrial lines. This allows for very stable and precise single and three-phase measurements. The Battery-Operated Transformer Ratio Meter uses a large LCD display with a backlight to present the values of ratio and phase difference of “H.V. Winding” to “L.V. Winding”, and the excitation voltage and the magnetizing current of the high voltage winding. Additionally, the instrument performs self-calibration and has different warning messages before each measurement in case of reversed connections and other failures.

Battery Operated Transformer Ratio Meter - Features
- Ratio range from 8 to 2,500
- Fully automated measurement
- Measuring voltage 10 V / 100 V selectable
- The display shows:
  - Ratio
  - Phase-angle
  - Excitation voltage
  - Magnetizing current
- Easy to read large LC display for all three-phases with backlight
- Built-in printer (optional)
- A robust mobile case for field use
Datasheet

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Three-Phase Transformer Turns Ratio Tester | PWR3A
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Three-Phase Transformer Turns Ratio Tester - Overview

The great advantage of the Three-Phase Transformer Tester PWR3A is its simple set-up. You simply type in the vector group with the keys to set up, connect the transformer to the device, and release the measurement. All three phases are measured consecutively. All connecting and short-circuited procedures at the primary and secondary voltage sides are performed automatically before each measurement. It is also possible to measure just one phase. An adjustable set value allows an error or deviation of the measured transformation ratio to be displayed. Automatic control of the tap changer is provided. All phases and taps are measured consecutively, and the results are stored inside the instrument and transferred to a PC. The transformer-specific data can be easily programmed via a connected PC but it is also possible via the internal keyboard. The PWR3A is connected to the H.V. and L.V. sides via four connections each. It also powers the test object at a selected voltage, supplied by an internal isolating transformer. An external excitation using different voltages and frequencies is also possible.

Three-Phase Transformer Turns Ratio Tester - Features

• Ratio range from 0.75 to 20,000 (higher ratios with CVT-Ext.)
• Fully automated measurement
• Features market unique Vector Group Detection
• Measuring voltage from 8 V to 230 V
• Measuring voltage up to 5 kV by CVT-Extension: PWR3A-CVT
• Using 3-phase voltage for phase angles other than 0°/180°
• Easy to handle tap changer automatic
• Internal memory stores all dates (Reading with PWR3A-XFER)
• LC display (256 x 128 pixel) with backlight
• Easy input of vector group and measuring conditions
• USB/RS232C port to get full instrument control
• Centronics printer port or built in printer (optional)
• Robust mobile case for field use
• Factory Certificate

Datasheet

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Handheld Turns Ratio Tester | TRT-H
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Handheld Turns Ratio Tester - Overview

The TRT-H is a battery operated, handheld, fully automatic test set designed for turns ratio, excitation current and phase shift measurements of transformers. The transformer turns ratio is determined by applying AC voltage across high-voltage winding, accurately measuring AC voltage across the corresponding unloaded transformer winding, and then displaying the ratio of these voltages. The user can enter a transformer’s nameplate voltages, so that the turns ratio deviation can be calculated. This feature eliminates any error otherwise caused by an operator’s manual calculation. It compares measured turns ratio with the nameplate ratio and prints out the % of error for each test. Applications include: Turns ratio measurement of distribution transformers; Turns ratio verification of instrument transformers; Turns ratio deviation calculation; Excitation current measurement of distribution and instrument transformers; Phase angle measurement of distribution and instrument transformers; and Polarity check of instrument transformers.

Handheld Turns Ratio Tester - Features
- Unique handheld instrument
- Extremely lightweight – only 1.4 kg / 3.1 lbs
- Measures 3 transformer parameters:
  - Turns ratio
  - Excitation current
  - Phase angle
- Single-phase test voltage up to 40 V AC
- Turns ratio accuracy up to ±0.1%
- Battery-powered
- Tests single-phase and three-phase transformers
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Handheld Turns Ratio and Winding Resistance Meter | TWR-H Series
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Handheld Turns Ratio and Winding Resistance Meter - Overview

This handheld, battery-operated, fully automatic test set is designed for turns ratio, phase shift, excitation current of transformers, and winding resistance measurement of transformers and other inductive objects. It can also perform demagnetisation of transformers, motors, and generators. The device generates true DC ripple-free currents. Both the injection of the current and the discharge of energy from transformer magnetic circuit are automatically regulated.

Handheld Turns Ratio and Winding Resistance Meter - Features
- Unique handheld instrument on the market
- Performs 3 different tests: Turns ratio, Winding resistance, Demagnetisation
- Single-phase test voltage up to 40 V AC
- Two DC current sources: Test current up to 2 A DC for transformer HV side, Test current up to 10 A DC for transformer LV side
- Extremely lightweight – only 1.4 kg / 3.1 lbs
- Battery-powered
- Tests single-phase and three-phase transformers
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