Vanguard Instruments TRF-250 Manuale utente

TRF-250

THREE-PHASE TRANSFORMER TURNS-RATIO METER

USER’S MANUAL

Vanguard Instruments Company

1520 S. Hellman Ave.

Ontario, California 91761, USA

TEL: (909) 923-9390

FAX: (909) 923-9391

July 2018

Revision 1

TRF-250 USER’S MANUAL REV 1

SAFETY SUMMARY

FOLLOW EXACT OPERATING PROCEDURES

Any deviation from procedures described in this User’s Manual may create one or more safety hazards, damage

the TRF-250, damage the test transformer, or cause errors in the test results. Vanguard Instruments Company, Inc.

assumes no liability for unsafe or improper use of the TRF-250. The following safety precautions must be observed

during all phases of test setup, test hookups, testing, and test lead disconnection.

SAFETY WARNINGS AND CAUTIONS

The TRF-250 shall be used only by trained operators. All transformers under test shall be off-line and fully

isolated. Always ground the TRF-250 to a substation ground before connecting the test cables to a transformer. Do

not perform test procedures or service unless another person is also present who is capable of rendering aid and

resuscitation.

SERVICE AND REPAIR

• Do not install substitute parts or perform any unauthorized modification to any TRF-250 test unit.

• Repairs must be performed only by Vanguard Instruments Company factory personnel or by an authorized

repair service provider. Unauthorized modifications can cause safety hazards and will void the manufacturer’s

warranty.

EQUIPMENT RATINGS

IP Rating: The enclosure for TRF-250 has an IP rating of 32.

Pollution Degree: The TRF-250 has a pollution rating of 2.

Operating Voltage: The TRF-250 is rated for use with an operating voltage of 120V or 240V, auto-ranging ±10% of

selected voltage.

Power Cord: The TRF-250 is supplied with a 16 AWG, 16A power cord with a NEMA 5-15P plug. Replacement cable

shall have the same or better rating and is available through the manufacturer.

VENTILATION REQUIREMENTS

The TRF-250 must be operated with the enclosure lid open.

SAFETY SYMBOLS

Indicates that caution should be exercised

Indicates location of chassis ground terminal

CLEANING

To clean the TRF-250:

• Disconnect all cables and turn the unit off.

• Use a soft, lint-free cloth to wipe all surfaces clean.

• Avoid getting moisture in openings and connectors.

• Don't use any cleaning products or compressed air.

REV 1 TRF-250 USER’S MANUAL

TABLE OF CONTENTS

CONVENTIONS USED IN THIS DOCUMENT ..................................................................................... 1

1.0 INTRODUCTION .................................................................................................................... 2

1.1 General Description and Features ................................................................................... 2

1.2 TRF-250 Technical Specifications ..................................................................................... 4

1.3 Controls and Indicators .................................................................................................... 5

2.0 PRE-TEST SETUP ................................................................................................................... 7

2.1 Operating Voltages .......................................................................................................... 7

2.2 LCD Screen Contrast Control ............................................................................................ 7

2.3 Printer Paper Control ....................................................................................................... 7

2.4 Printer Paper .................................................................................................................... 7

2.5 Replacing the Load Tap Changer Controller Fuses .......................................................... 8

3.0 OPERATING PROCEDURES ................................................................................................... 9

3.1 Connection Diagrams ....................................................................................................... 9

3.1.1. Typical Connections to a Load Tap Changer (LTC) ........................................................... 9

3.1.2. Typical Connections to a Delta-Wye Transformer ......................................................... 10

3.2 Setting the Test Voltage ................................................................................................. 18

3.3 Setting the Date and Time ............................................................................................. 20

3.4 Setting the User Interface Language ............................................................................. 22

3.5 Clearing the List of Trusted Bluetooth Devices .............................................................. 24

3.6 Performing Tests ............................................................................................................ 26

3.6.1. Entering Test Record Header Information ............................................................. 26

3.6.2. Testing a Single Phase Transformer ....................................................................... 29

3.6.3. Testing a Dyn1 (12,000 V/208 V) Transformer ....................................................... 38

3.6.4. Testing a Three Phase Transformer Using Auto Detect Mode .............................. 48

3.7 Working With Test Records ........................................................................................... 55

3.7.1. Saving Test Results to a Test Record ...................................................................... 55

3.7.2. Restoring a Test Record From Flash EEPROM ........................................................ 57

3.7.3. Restoring a Test Record From a USB Flash Drive ................................................... 62

3.7.4. Copying Test Records to a USB Flash Drive ............................................................ 66

3.7.5. Printing or Displaying a Test Record ...................................................................... 69

3.7.6. Printing a Test Record Directory ............................................................................ 71

3.7.7. Erasing Test Records from the Flash EEPROM ....................................................... 74

3.7.8. Erasing Test Records from a USB Flash Drive ......................................................... 78

3.8 Working With Test Plans ................................................................................................ 81

3.8.1. Performing a Test Using a Transformer Test Plan .................................................. 81

3.8.2. Unloading a Test Plan From the Working Memory ................................................ 88

3.8.3. Printing a Test Plan Directory ................................................................................. 89

3.8.4. Printing a Test Plan ................................................................................................. 91

3.8.5. Saving a Test Plan ................................................................................................... 94

3.8.6. Copying a Test Plan to a USB Flash Drive ............................................................... 96

3.8.7. Erasing Test Plans ................................................................................................... 98

TRF-250 USER’S MANUAL REV 1

iii

4.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING ............................................... 102

4.1 Performing an H and X Cable Diagnostic Test ............................................................. 102

4.2 Performing a Verification Test ..................................................................................... 104

APPENDIX A – TRANSFORMER VECTOR GROUP CODES ............................................................. 106

APPENDIX B – Common ANSI Transformer Descriptions ........................................................... 107

APPENDIX C – CEI/IEC 60076-1 Transformer Descriptions ......................................................... 115

APPENDIX D – Australian Std.2374 Transformer Descriptions ................................................... 122

REV 1 TRF-250 USER’S MANUAL

LIST OF TABLES

Table 1. TRF-250 Technical Specifications ...................................................................................... 4

Table 2. Functional Descriptions of TRF-250 Controls and Indicators ............................................ 6

Table 3. Descriptions of Single Phase Test Results Elements (Column Format) .......................... 35

Table 4. Descriptions of Single Phase Test Results Elements (Detailed Format) ......................... 37

Table 5. Descriptions of Dyn1 Test Results Elements (Column Format) ...................................... 45

Table 6. Descriptions of Dyn1 Test Results Elements (Detailed Format) ..................................... 47

LIST OF FIGURES

Figure 1. TRF-250 Controls and Indicators ...................................................................................... 5

Figure 2. Typical Connections to a Load Tap Changer (LTC) ........................................................... 9

Figure 3. Typical H & X Cable Connections to a Delta-Wye Transformer ..................................... 10

Figure 4. Typical Connections to a Single Phase Transformer ...................................................... 11

Figure 5. Typical Connections to a Single Phase Auto Transformer ............................................. 11

Figure 6. Typical Connections to a Type A Voltage Regulator ...................................................... 12

Figure 7. Typical Connections to a Type B Voltage Regulator ...................................................... 12

Figure 8. Typical Connections to a Donut Type (un-mounted) Current Transformer (CT) ........... 13

Figure 9. Typical Connections to a Multi-Tap Current Transformer ............................................. 14

Figure 10. Typical Connections to a Bushing Mount CT on a Single Phase Transformer ............. 15

Figure 11. Typical Connections to Bushing Mount CT's on Delta Transformer ............................ 16

Figure 12. Typical Connections to Bushing Mount CT's on Wye Transformer ............................. 17

Figure 13. Single Phase Test Results Printout - Column Format .................................................. 35

Figure 14. Single Phase Test Results Printout - Detailed Format ................................................. 36

Figure 15. Dyn1 Test Results Printout - Column Format .............................................................. 44

Figure 16. Dyn1 Test Results Printout - Detailed Format ............................................................. 46

Figure 17. Typical USB Flash Drive (Thumb Drive) Test Record Directory Printout ..................... 73

Figure 18. Typical Internal Flash EEPROM Test Record Directory Printout .................................. 73

Figure 19. Test Plan Test Results Printout .................................................................................... 87

Figure 20. Sample Printout of a Test Plan from a USB Flash Drive ............................................... 92

Figure 21. Sample Printout of a Test Plan from Internal Memory ............................................... 93

TRF-250 USER’S MANUAL REV 1

CONVENTIONS USED IN THIS DOCUMENT

This document uses the following conventions:

•

A key, switch, or knob on the TRF-250 is indicated as

[KEY], [SWITCH], [KNOB]

•

Menu names are referenced as “MENU NAME”

• TRF-250 LCD screen output is shown as:

• When instructions are provided, the menu item that should be selected is printed in bold as

shown below (option 3 should be selected):

• Warning messages are indicated as:

WARNING

Warning message

• Important notes are indicated as:

NOTE

Note details

1. OPTION 1

2. OPTION 2

3. OPTION 3

4. OPTION 4

5. OPTION 5

1. OPTION 1

2. OPTION 2

3. OPTION 3

4. OPTION 4

5. OPTION 5

REV 1 TRF-250 USER’S MANUAL

1.0 INTRODUCTION

1.1 General Description and Features

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.

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.

Transformer 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.

Built-in Thermal Printer

The TRF-250 features a built-in 4.5-inch wide thermal printer that can be used to print test

results.

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.

TRF-250 USER’S MANUAL REV 1

Bluetooth PC Interface

The TRF-250 offers an industry-first Bluetooth wireless interface that can be used to remotely

control the unit.

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).

The 250V Test Voltage Advantage

The 250V test voltage provided by the TRF-250 provides more accurate test results when

measuring the transformer turns ratios of very large transformers with a built-in LTC. The three

figures below show the turns ratio test results and corresponding percentage error of a

600MVA transformer with an LTC in the Lowest position using 40V, 100V, and 250V test

voltages. At the 250V test voltage, the percentage error is less than 0.5% as specified in IEC

60076-1 and IEEE C57.12.00-2006-1 standards.

Test results using 40V test voltage Test results using 100V test voltage Test results using 250V test voltage

%Error > 0.5% %Error > 0.5%

%Error < 0.5%

REV 1 TRF-250 USER’S MANUAL

1.2 TRF-250 Technical Specifications

Table 1. TRF-250 Technical 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% @ 4Vac

0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%. 4,000 – 14,999: ±1%,

15,000 – 50,000: ±1.5% @ 40Vac

0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.20%. 4,000 – 14,999: ±1%,

15,000 – 50,000: ±1.5% @ 100Vac

0.8 – 1,999: ±0.1%, 2,000 – 3,999: ±0.15%. 4,000 – 14,999: ±0.8%,

15,000 – 50,000: ±1.2% @ 250Vac

TEST VOLTAGES 4 Vac @ 1 Amp, 40 Vac @ 200 mA, 100 Vac @ 100 mA, 250 Vac @ 50

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 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)

HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing

ALTITUDE (MAX) 2000m (6562 ft) to fully safety specifications

CABLES One 15-foot single-phase set, one 15-foot 3-phase set, one 25-foot

extension set, one safety ground, one USB, cable bag

WARRANTY One year on parts and labor

NOTE

The above specifications are valid at nominal operating voltage and at a

temperature of 25°C (77°F). Specifications may change without prior notice.

TRF-250 USER’S MANUAL REV 1

1.3 Controls and Indicators

The TRF-250 controls and indicators are shown in Figure 1. A leader line with an index number

points to each control and indicator, which is cross-referenced to a functional description in the

corresponding table. The purpose of the controls and indicators may seem obvious, but users

should familiarize themselves with them before using the TRF-250. Accidental misuse of the

controls will usually cause no serious harm. Users should also familiarize themselves with the

safety summary information found on the front page of this User’s Manual.

Figure 1. TRF-250 Controls and Indicators

Indice

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