Three-Phase Automatic Transformer Ratio Finder with four selectable test voltages
Three-Phase Automatic Transformer Ratio Finder with four selectable test voltages

TRF-250

3-Phase Automatic Turns Ratio Tester with three selectable test voltages ATRT-03 S2
Three-Phase Automatic Turns Ratio Finder with internal rechargeable battery, four selectable test voltages TRF-250A

$14,106.11

Manufacturer: Vanguard Instrument

Model: TRF-250

P/N: 9105-UC

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

SKU: AMA-5127-12
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Description

TRF-250

TRF-250

Three-Phase Automatic Transformer Ratio Finder with four selectable test voltages (4VAC, 40VAC, 100VAC, 250 VAC) and built-in LTC controller

Description of TRF-250

The TRF-250 is Vanguard’s fourth generation transformer turns ratio tester. This latest design provides a higher turns-ratio test voltage of 250Vac, provides a wireless Bluetooth PC interface, and features a 44-key “QWERTY”-style membrane keyboard. All these features greatly improve the accuracy of the turns ratio readings, ease of operation, and reliability.

The TRF-250 determines the turns ratio of the transformer under test using the IEEE C57.12.90 measurement method. The turns-ratio range is from 0.8 to 50,000 to 1. Transformer turns ratio, excitation current, and winding polarity are displayed on the built-in 128 x 64 pixels graphic LCD screen.

The TRF-250 can be used as a standalone unit or can be computer-controlled.

  • Ratio Range: 0.8 – 50,000 to 1
  • Capable of detecting 130 different 3-phase transformer types defined by ANSI, IEC, and Australian standards
  • 4 test voltages: 4Vac, 40Vac, 100Vac, and 250Vac
  • Phase angle and excitation current measurement
  • Bluetooth and USB PC interfaces
  • 4.5-inch wide thermal printer (optional)

User Interface

The TRF-250 features a back-lit LCD screen (128 x 64 pixels) that is viewable in both bright sun­light and low-light levels. The test results screen displays the transformer turns-ratio, excitation current, phase angle, and percentage error. The unit is controlled via a rugged, 44-key, “QWERTY”-style membrane keypad.

Computer Interface

In computer-controlled mode, the unit can be con­trolled via the Bluetooth or USB interface using the supplied PC software (Transformer Turns-Ratio Analyzer application provided with each unit). This Windows®-based application can be used to run tests and to store test results on a PC. Test results can also be exported to Excel, PDF, and XML for­mats for further analysis.

USB Flash Drive Interface

A built-in USB Flash drive interface provides a convenient method for transferring test plans and test records to or from a USB Flash drive. The user can store up to 999 transformer test plans and test records on a USB Flash drive, and the supplied PC software can be used to view the test records.

Internal Test Record Storage

Up to 112 test records can be stored in the TRF-250’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 available interfaces (Bluetooth, USB port, USB Flash drive port).

Transformer Test Plans

The TRF-250 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 PC software and can be transferred to the TRF-250 via the available interfaces (Bluetooth, USB port, USB Flash drive port).

Auto-Detect Transformer Configuration

The TRF-250 can automatically detect 130 specific vector groups for different transformer types defined by ANSI, CEI/IEC, and Australian standards.

Transformer Test Voltages

To prevent an accidental wrong test-lead hook-up (e.g., when the operator reverses H and X leads), the TRF-250 outputs a low-level test voltage to verify the hook-up condition before applying the full test voltage to the transformer. Four test voltages (4 Vac, 40 Vac, 100 Vac, 250 Vac) allow the TRF-250 to test CT’s and PT’s, as well as power transformers.

Load Tap Changer Control

Voltage regulator or LTC tap positions can be changed remotely using the unit’s built-in transformer load tap changer. This feature eliminates the need to manu­ally raise or lower tap positions from the transformer control panel.

Optional Built-in Thermal Printer

The TRF-250 offers 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 18”W x 5”H x 12”D (45.7 cm x 12.7 cm x 30.5 cm ); Weight: 20 lbs (9.1 kg)
OPERATING VOLTAGE 100 – 240 Vac, 50/60 Hz
MEASUREMENT METHOD ANSI/IEEE C57.12.90
TURNS-RATIO MEASURING RANGE 0.8 – 50,000 to 1
TURNS-RATIO ACCURACY 0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.25%, 4,000 – 14,999: ±1%, 15,000 – 50,000: ±2% @ 4 Vac
0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%, 4,000 – 14,999: ±1%, 15,000 – 50,000: ±1.5% @ 40 Vac
0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%. 4,000 – 14,999: ±1%, 15,000 – 50,000: ±1.5% @ 100 Vac
0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.15%. 4,000 – 14,999: ±0.8%, 15,000 – 50,000: ±1.2% @ 250 Vac
TEST VOLTAGES 4 Vac @ 1 Amp, 40 Vac @ 200 mA, 100 Vac @ 100 mA, 250 Vac @ 50 mA
EXCITATION CURRENT READING RANGE 0 – 2 Amperes; Accuracy: ±0.1 mA, ±2% of reading (±1 mA)
PHASE-ANGLE MEASUREMENT 0 – 360 degrees; Accuracy: ±0.2 degree ( ±1 digit)
DISPLAY Back-lit LCD screen (128 x 64 pixels) viewable in bright sunlight and low-light levels
PRINTER Optional built-in 4.5-inch wide thermal printer
COMPUTER INTERFACES Bluetooth, USB port
EXTERNAL DATA STORAGE One USB Flash drive interface port; Up to 999 transformer test records can be stored on a USB Flash drive (not included)
INTERNAL TEST RECORD STORAGE Can store 112 transformer test records internally. Each record holds the test record header and up to 99 readings.
INTERNAL TEST PLAN STORAGE Can store 128 transformer test plans internally. Test plans can be transferred to the unit from the PC via Bluetooth/USB port or via the USB Flash drive interface
PC SOFTWARE Windows®-based Transformer Turns Ratio Analyzer application is included with purchase price
LOAD TAP CHANGER CONTACT 240 Vac, 2 Amps
SAFETY Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 standards
ENVIRONMENT Operating: -10˚ to 50˚ C (15˚ to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚ to +158˚ F)
CABLES One 15-foot (4.57m) single-phase set, one 15-foot (4.57m) 3-phase set, one 25-foot (7.62m) extension set, one safety ground, one USB, cable bag
OPTIONS Transportation case
WARRANTY One year on parts and labor
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).
Last updated on February 16, 2009

 

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