3-Phase Automatic Transformer Turns Ratio Tester
3-Phase Automatic Transformer Turns Ratio Tester

Automatic, 3-Phase Transformer Ratio Finder

Capacitor Voltage Transformer (CVT) Turns Ratio Tester Capacitor Voltage Transformer (CVT) Turns Ratio Tester
3-Phase Automatic Turns Ratio Tester with three selectable test voltages ATRT-03 S2

$9,929.15

Manufacturer: Vanguard Instrument

Model: TRF-100

P/N: 9117-UC

Supplied with:Base unit with PC software, single and 3-phase cable set, cable carrying bag, and shipping case.

SKU: AMA-5127-10
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Description

Automatic, 3-Phase Transformer Ratio Finder

Automatic, 3-Phase Transformer Ratio Finder

3-Phase Automatic Transformer Turns Ratio Tester with three selectable test voltages (4VAC, 40VAC, 100VAC.) USB PC interface

Description of Automatic, 3-Phase Transformer Ratio Finder

The TRF-100 is Vanguard’s third generation, microprocessor-based, automatic, three phase, transformer turns-ratio tester. This lightweight, portable unit is designed for testing transformers at utility power substations.
The TRF-100 determines the transformer turns-ratio using the IEEE C57.12.90 measurement method. The transformer turns-ratio (ranging from 0.8 to 50,000) is determined by precisely measuring the voltages across the unloaded transformer windings. To ensure accuracy, the TRF-100’s measuring circuitry self-calibrates before each measurement. It requires neither adjustment nor temperature compensation. The TRF-100’s turns-ratio measurement accuracy is 0.1% or better.

  • Ratio Range: 0.8 – 50,000 to 1
  • Capable of detecting 130 different 3-phase transformer types defined by ANSI, IEC, and Australian standards
  • 3 test voltages: 4Vac, 40Vac, and 100Vac
  • Phase angle and excitation current measurement
  • USB PC interfaces
  • 4.5-inch wide thermal printer (optional)

Product Overview

The TRF-100 can perform a specific test for each trans­former type (such as single phase, delta to Y, Y to delta, delta to delta, or Y to Y) without the need to switch test hookup cables. Also, the unit’s automatic transformer phase detection feature can detect different transformer vector diagrams. The TRF-100 can automatically detect and test 67 transformer types defined by ANSI, CEI/IEC and Australian standards.

To prevent an accidental wrong test-lead hook-up (e.g., when the operator reverses H and X leads), the TRF-100 outputs a low-level test voltage to verify the hook-up condition before applying the full test voltage to the transformer.

In addition to measuring a transformer’s turns-ratio, the TRF-100 can also measure a transformer’s excitation current (in milli-amperes) and its winding phase angle.

Three test voltages (4 Vac, 40 Vac, 100 Vac) allow the TRF-100 to test CT’s and PT’s, as well as power trans­formers.

The TRF-100 can also calculate the turns-ratio percent­age error if the transformer’s nameplate voltages are provided. The baseline turns-ratio is calculated using the nameplate voltages, and the test results are com­pared to the baseline turns-ratio. The percentage er­ror is then calculated from the difference between the baseline and test turns-ratios.

User Interface

The TRF-100 features a back-lit LCD screen (20 characters by 4 lines) that is viewable in both bright sunlight and low-light levels. The test re­sults screen displays the transformer turns-ra­tio, excitation current, and turns-ratio accuracy. The unit is controlled via a rugged “QWERTY”-style membrane keypad.

Computer Interface

The TRF-100 can be computer-controlled via the USB interface using the supplied Vanguard TTRA S2 turns ratio analysis PC software. The TTRA S2 software can be used to run a test and to store test results on a PC. Test results can also be exported to Excel, PDF, and XML formats for further analysis.

Transformer Load Tap Changer Control

Voltage regulator or LTC tap positions can be changed remotely using the optional Tap-Chang­er Remote Control Box. This option eliminates the need to manually raise or lower tap positions from the transformer control panel.

Internal Test Record Storage

Up to 1,000 test records can be stored in the TRF-100’s Flash EEPROM memory. Each test record may contain up to 99 turns-ratio, excitation current, phase angle, and nameplate voltage readings. Test records can be re­called locally or transferred to a PC via the USB interface.Transformer Test Plans

The TRF-100 can store up to 128 transformer test-plans in its Flash EEPROM. A test plan is comprised of the transformer nameplate voltages for each tap setting. The calculated turns-ratio based on the nameplate voltages is compared with the measured turns-ratio to derive the percentage error and Pass/Fail results. By us­ing a test plan, a transformer can be quickly tested and turns-ratio Pass/Fail reports can be reviewed. Test plans can be created with the included PC software and can be transferred to the ATRT-03 via the USB interface.

Built-in Thermal Printer Option

The TRF-100 can be outfitted with an optional built-in 4.5” wide thermal printer that can be used to print test results

SPECIFICATIONS

TYPE Portable, lightweight, automatic 3-phase transformer turns-ratio meter
PHYSICAL SPECIFICATIONS Dimensions: 17”W x 7”H x 13”D (43.2 cm x 17.8 cm x 33.0 cm)
Weight: 14 lbs (6.4 kg)
INPUT POWER 100 – 120 Vac or 200 – 240 Vac (selectable), 50/60 Hz, 3 Amps
MEASUREMENT METHOD ANSI/IEEE C57.12.90
TURNS-RATIO MEASURING RANGE 0.8 – 50,000 to 1
 TYPICAL TURNS-RATIO ACCURACY 4 Vac: 0.8 – 1,000 (±0.08%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.25%)
40 Vac: 0.8 – 1,000 (±0.05%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.25%), 15,001 – 20,000 (±0.4%), 20,001 – 50,000 (±0.5%)
100 Vac: 0.8 – 1,000 (±0.05%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.25%), 15,001 – 20,000 (±0.4%), 20,001 – 50,000 (±0.5%)
TEST VOLTAGES 4 Vac @ 1.0A, 40 Vac @ 0.6A, 100 Vac @ 0.1A
CURRENT READING RANGE 0 – 2 Amperes; accuracy: ±1mA, ±2% of reading (±1 digit)
PHASE-ANGLE MEASUREMENT 0 – 360 degrees; Accuracy: ±0.2 degree ( ±1 digit)
DISPLAY back-lit LCD screen (20 characters by 4 lines)
viewable in bright sunlight and low-light levels
PRINTER Optional built-in 4.5-inch wide thermal printer
COMPUTER INTERFACE USB PC interface
INTERNAL TEST RECORD STORAGE stores 1,000 complete transformer test records, each including nameplate voltage, turns-ratios, excitation current, and winding phase angle
INTERNAL TEST PLAN STORAGE stores up to 128 transformer test plans
PC SOFTWARE Windows®-based transformer turns-ratio analysis software is included with purchase
SAFETY designed to meet IEC 61010 (1995), UL 61010A-1, and CSA-C22.2 standards
TEMPERATURE Operating: -10˚ to 50˚ C (15˚ to +122˚ F)
Storage: -30˚ C to 70˚ C (-22˚ to +158˚ F)
HUMIDITY 90% RH @ 40°C (104°F) non-condensing
ALTITUDE 2,000 m (6,562 ft) to full safety specifications
CABLES 15 ft (4.6m) single phase cable set, 15 ft (4.6m) 3-phase cable set, 25 ft (7.6m) extension cable set, USB cable, power & ground cables, cable bag
OPTIONS shipping case, transformer load tap-changer remote control device, 30′ (9.14 m) single and 3-phase H and X leads
WARRANTY One year on parts and labor
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).
Last updated on April 14, 2016

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