ATRT-03, ATRT-03A, and ATRT-03B THREE-PHASE TRANSFORMER TURNS-RATIO METERS USER’S MANUAL Vanguard Instruments Company, Inc. 1520 S. Hellman Ave.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 SAFETY SUMMARY This manual applies to the ATRT-03, ATRT-03A, and ATRT-03B current transformer turns-ratio meters. The operating procedures are virtually the same for all three models, and any differences are clearly described where applicable.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B 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 Technical Specifications ..............................
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 APPENDIX A – TRANSFORMER VECTOR GROUP CODES ............................................................... 84 APPENDIX B – Common ANSI Transformer Descriptions ............................................................. 85 APPENDIX C – CEI/IEC 60076-1 Transformer Descriptions ........................................................... 93 APPENDIX D – Australian Std.2374 Transformer Descriptions ...................................................
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL LIST OF TABLES Table 1. ATRT-03 Technical Specifications ...................................................................................... 4 Table 2. ATRT-03A Technical Specifications ................................................................................... 5 Table 3. ATRT-03B Technical Specifications.................................................................................... 6 Table 4.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: • The general term “ATRT” is used in this manual to refer to any of the ATRT-03 models (ATRT-03, ATRT-03A, and ATRT-03B). • A key, switch, or knob on the ATRT is indicated as [KEY], [SWITCH], [KNOB]. • Menu names are referenced as “MENU NAME” • ATRT LCD screen output is shown as: 1.OPTION 2.OPTION 3.OPTION 4.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 1.0 INTRODUCTION 1.1 General Description and Features The ATRT-03 line is Vanguard’s second generation family of microprocessor-based, automatic, three phase, transformer turns-ratio testers. The ATRT-03 line consists of the following three models: • The ATRT-03 is a line-powered, 120/240 Vac (selectable), 50/60 Hz turns-ratio tester featuring a built-in thermal printer.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Transformer Test Plans The ATRT-03 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 turnsratio based on the nameplate voltages is compared with the measured turns-ratio. By recalling a test plan, a transformer can be quickly tested and turns-ratio Pass/Fail reports can be reviewed.
REV 7 1.2 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Technical Specifications 1.2.1. ATRT-03 Technical Specifications Table 1. ATRT-03 Technical Specifications TYPE Portable, lightweight, automatic, three-phase transformer turns-ratio meter PHYSICAL SPECIFICATIONS 17”W x 7”H x 13”D (43.2cm x 17.8 cm x 33.0 cm); Weight: 14 lbs (6.4 kg) INPUT POWER 3 amps, 110 – 120 Vac or 220 – 240 Vac (selectable), 50/60 Hz MEASUREMENT METHOD ANSI/IEEE C57.12.90 RATIO-MEASURING RANGE 0.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 1.2.2. ATRT-03A Technical Specifications Table 2. ATRT-03A Technical Specifications TYPE Portable, lightweight, automatic, battery-powered three-phase transformer turns-ratio meter PHYSICAL SPECIFICATIONS 19”W x 7”H x 15”D (48.2cm x 17.8 cm x 38.1 cm); Weight: 25 lbs (11.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 1.2.3. ATRT-03B Technical Specifications Table 3. ATRT-03B Technical Specifications TYPE Portable, lightweight, automatic, three-phase transformer turns-ratio meter PHYSICAL SPECIFICATIONS 17”W x 7”H x 13”D (43.2cm x 17.8 cm x 33.0 cm); Weight: 13 lbs (5.9 kg) INPUT POWER 3 amps, 110 – 120 Vac or 220 – 240 Vac (selectable), 50/60 Hz MEASUREMENT METHOD ANSI/IEEE C57.12.90 RATIO-MEASURING RANGE 0.8 – 15,000 (5-digit resolution) TURNS-RATIO ACCURACY 0.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 1.3 REV 7 Controls and Indicators The ATRT-03, ATRT-03A, and ATRT-03B controls and indicators are shown in Figure 1, Figure 2, and Figure 3, respectively. 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 ATRT.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Table 4. Functional Descriptions of ATRT-03 Controls and Indicators Item Number Panel Markings Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and low-light levels. 1 2 H H voltage connector. 3 X X voltage connector. 4 5 4.5-inch wide thermal printer. 120/240 Vac, 1A, 50/60Hz Fuse: 250Vac, 2A Fast-Blow 6 7 RS-232C 8 TEST IN PROGRESS 10 Input power connector and fused power switch with third-wire safety ground.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Figure 2.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Table 5. Functional Descriptions of ATRT-03A Controls and Indicators Item Number Panel Markings Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and low-light levels. 1 2 H H voltage connector. 3 X X voltage connector. 4 4.5-inch wide thermal printer. 5 POWER 6 120/240 Vac, 1A, 50/60Hz Fuse: 250Vac, 2A Fast-Blow 7 GROUND Ground stud for connecting to sub-station ground.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Figure 3.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Table 6. Functional Descriptions of ATRT-03B Controls and Indicators Item Number Panel Markings Back-lit LCD screen (20 characters by 4 lines), viewable in bright sunlight and low-light levels. 1 2 H H voltage connector. 3 X X voltage connector. 4 120/240 Vac, 1A, 50/60Hz Fuse: 250Vac, 2A Fast-Blow 5 RS-232C 7 TEST IN PROGRESS 9 Input power connector and fused power switch with third-wire safety ground.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 2.0 PRE-TEST SETUP 2.1 ATRT-03 and ATRT-03B Operating Voltages REV 7 The ATRT-03 and ATRT-03B’s voltage is preset at the factory and is selectable between 110-120 Vac, 50/60 Hz or 220-240 Vac, 50/60 Hz. The voltage is set by placing jumpers on the reference transformer as listed in Table 7 and illustrated in Figure 4. Table 7.
REV 7 2.4 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Printer Paper Control (ATRT-03 and ATRT-03A Only) To advance the thermal printer paper, press and release the [PAPER ∧ Contrast] key. To retract the thermal printer paper, press and release the [PAPER ∨ Contrast] key. 2.5 Printer Paper (ATRT-03 and ATRT-03A Only) The ATRT-03 and ATRT-03A’s built-in thermal printers use 4.5-inch wide thermal paper for printing test results.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.0 REV 7 OPERATING PROCEDURES The ATRT-03 should always be grounded with the provided ground cable before connecting H and X cables. The transformer bushings should also be grounded before connecting test leads to the transformer. This will prevent inducing any voltages into the ATRT-03. All transformer bus connections must be removed, and the transformer must be isolated before performing any tests.
REV 7 3.1.2. ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Typical Connections to a Delta-Wye Transformer Figure 6.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.1.3. REV 7 Typical Connections to a Single Phase Transformer Figure 7. Typical Connections to a Single Phase Transformer Figure 8.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.1.4. Typical Connections to a Voltage Regulator Figure 9. Typical Connections to a Type A Voltage Regulator Figure 10.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.1.5. Typical Connections to a Donut Type (un-mounted) Current Transformer Figure 11. Typical Connections to a Donut Type (un-mounted) Current Transformer (CT) The H and X test leads are reversed for the CT ratio test connections shown above.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.1.6. Typical Connections to a Multi-Tap Current Transformer Figure 12.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.1.7. Typical Connections to a Bushing Mount CT on a Single Phase Transformer Figure 13.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.1.8. Typical Connections to Bushing Mount CT’s on Delta Transformer Figure 14. Typical Connections to Bushing Mount CT's on Delta Transformer The CT turns-ratio is obtained by performing a Ynd11 test.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.1.9. Typical Connections to Bushing Mount CT’s on Wye Transformer Figure 15. Typical Connections to Bushing Mount CT's on Wye Transformer The CT turns-ratio is obtained by performing a Ynyn0 test.
REV 7 3.2 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Setting the Test Voltage The ATRT-03 offers three test voltages, 8 Vac, 40 Vac, and 100 Vac. The unit always defaults to 40 Vac at power-on. The 8 Vac test voltage is for testing transformers which require low test voltages, such as metering Current Transformers (CT’s). For metering CT’s, higher voltages may drive the CT’s into saturation, thus giving invalid results. The 40 Vac test voltage is recommended for testing power transformers.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 e. The voltage will be set and the following confirmation message will be displayed: TEST VOLTAGE SET TO: 40 VOLTS RMS Press any key to return to the “START-UP” menu.
REV 7 3.3 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Setting the Date and Time To set the date and time: a. Start from the “START-UP” menu: 1.TEST XFMR 08/16/10 2.SETUP 08:14:58 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.RESTORE RECORD 4.NEXT PAGE Press the [4] key (NEXT PAGE). c. The following screen will be displayed: 1.COMPUTER CONTROL 2.SET TIME 3.SET TEST VOLTAGE 4.TEST PLANS Press the [2] key (SET TIME).
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.4 REV 7 Enabling the Computer Interface The ATRT-03 can be connected to a computer via the RS-232C interface port. In order to remotely control the unit using the provided Transformer Turns Ratio Analysis (TTRA) software, the unit must be placed in Computer Control mode. Follow the steps below to place the unit in Computer Control mode: a. Start from the “START-UP” menu: 1.TEST XFMR 08/16/10 2.SETUP 08:14:58 3.CALCULATOR 4.DIAG 5.
REV 7 3.5 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Using the Turns Ratio Calculator The ATRT-03 features a turns ratio calculator that can be used to calculate the turns ratio for various transformer types. The user only needs to provide the H and X name plate voltage values. Follow the steps below to use the turns ratio calculator. a. Start from the “START-UP” menu: 1.TEST XFMR 08/16/10 2.SETUP 08:14:58 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [3] key (CALCULATOR). b.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Press any key to return to the “START-UP” menu.
REV 7 3.6 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Performing Tests 3.6.1. Entering Test Record Header Information You can enter the test record header information before performing tests. The record header includes identifying information such as the company, station, circuit, manufacturer, etc. Once the header information has been set, it will apply to all subsequent test records. To enter the header information: a. Start from the “START-UP” menu: 1.TEST XFMR 08/16/10 2.SETUP 08:14:58 3.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 d. The following screen will be displayed: STATION: _ UP/DOWN TO POSITION “ENTER” TO ACCEPT Type the station name using the alpha-numeric keypad and then press the [ENTER] key. e. The following screen will be displayed: CIRCUIT: _ UP/DOWN TO POSITION “ENTER” TO ACCEPT Type the circuit information using the alpha-numeric keypad and then press the [ENTER] key. f.
REV 7 i. ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL The following screen will be displayed: KVA RATING: _ UP/DOWN TO POSITION “ENTER” TO ACCEPT Type the transformer’s KVA rating using the alpha-numeric keypad and then press the [ENTER] key. j. The following screen will be displayed: OPERATOR: _ UP/DOWN TO POSITION “ENTER” TO ACCEPT Type the operator’s name using the alpha-numeric keypad and then press the [ENTER] key.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.6.2. Testing a Single Phase Transformer Follow the steps below to test a single phase transformer: a. Start from the “START-UP” menu: 1.TEST XFMR 08/16/10 2.SETUP 08:14:58 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [1] key (TEST XFMR). b. The following screen will be displayed: XFMR CONFIGURATION: 1.SNG PHS 2.dT-Y 3.Y-dT 4.dT-dT 5.Y-Y 6.SP TEST Press the [1] key (SNG PHS). c. The following screen will be displayed: XFMR NAME PLATE VLTG 1.YES 2.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Type the H winding name plate voltage value using the numeric keypad. The screen will be updated as shown below: ENTER H WINDING NAME-PLATE VOLTAGE: 2,400 V Press the [ENTER] key. The following screen will be displayed: ENTER X WINDING NAME-PLATE VOLTAGE: V Type the X winding name plate voltage value using the numeric keypad. The screen will be updated as shown below: ENTER X WINDING NAME-PLATE VOLTAGE: 240 V Press the [ENTER] key. Continue to step d. 2.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 The test results will be displayed on the LCD screen when testing has finished: RATIO +10.009 mA % DIFF 0005 0.09 The polarity is displayed as either a plus sign (+) for “in-phase” or a minus sign (-) for “out-of-phase”. The value listed under “% DIFF” is the percentage error. The percentage error (% DIFF) is calculated as the absolute value of: [(Calculated Ratio – Measured Ratio) / Calculated Ratio)] x 100 NOTE Press any key to continue.
REV 7 i. ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL The following screen will be displayed: TEST SAVED Press any key to continue. NOTE The above screen will be displayed if there is currently no data in the unit’s memory buffer. If a test was previously performed or a test record was restored from Flash EEPROM or from a Flash drive, the following screen will be displayed instead: PREVIOUS DATA IN BUF 08/17/10 10:56:05 1.APPEND PREV. DATA 2.CLEAR PREV. DATA Press the [1] key (APPEND PREV.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 k. The following screen will be displayed: SAVE THIS RECORD? 1.YES 2.NO Press the [1] key (YES) to save the test record to the unit’s Flash EEPROM. l. The following screen will be displayed momentarily: SAVING RECORD... PLEASE WAIT... The following confirmation screen will then be displayed: RECORD NUMBER 1 HAS BEEN SAVED! The unit will automatically assign the record number and will not over-write existing test records.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Figure 16. Single Phase Test Results Printout - Column Format (ATRT-03 and ATRT-03A only) Table 8. Descriptions of Single Phase Test Results Elements (Column Format) Item Number 38 Description 1 Test record date and time. 2 Test record header information (see section 3.6.1). 3 Test voltage. 4 Type of transformer under test. 5 H tap voltage. 6 X tap voltage. 7 Calculated ratio.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Figure 17. Single Phase Test Results Printout - Detailed Format (ATRT-03 and ATRT-03A only) Table 9. Descriptions of Single Phase Test Results Elements (Detailed Format) Item Number Description 1 Test record date and time. 2 Test record header information (see section 3.6.1). 3 Test voltage. 4 Type of transformer under test. 5 H tap voltage. 6 X tap voltage. 7 Calculated ratio. 8 Measured ratio.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.6.3. Performing a Three-Phase Test (Y-dT Example) Follow the steps below to perform a three-phase test. The following example is for testing a YdT type transformer: a. Start from the “START-UP” menu: 1.TEST XFMR 08/16/10 2.SETUP 08:14:58 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [1] key (TEST XFMR). b. The following screen will be displayed: XFMR CONFIGURATION: 1.SNG PHS 2.dT-Y 3.Y-dT 4.dT-dT 5.Y-Y 6.SP TEST Press the [2] key (dT-Y). c.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 1. YES Press the [1] key (YES) if you would like to enter the transformer name plate voltage values. The following screen will be displayed: ENTER H WINDING NAME-PLATE VOLTAGE: V Type the H winding name plate voltage value using the numeric keypad. The screen will be updated as shown below: ENTER H WINDING NAME-PLATE VOLTAGE: 1,734 V Press the [ENTER] key.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Y to DELTA XFORMER PLEASE WAIT... The screen will be updated with the Phase A test results as shown: RATIO mA +10.021 0011 % DIFF 0.10 PLEASE WAIT... Testing will continue, and the screen will be updated with the Phase B test results as shown: RATIO mA % DIFF +10.021 0011 0.10 +10.005 0010 0.06 PLEASE WAIT... Finally, the screen will be updated with the Phase C test results as shown: RATIO mA +10.021 0011 +10.005 0010 +10.021 0012 % DIFF 0.10 0.06 0.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 h. The following screen will be displayed: PRINT FORMAT? 1.COLUMN 2.DETAILED Press the [1] key (COLUMN) to print a columnar report (see Figure 18) or press the [2] key (DETAILED) to print a detailed report (see Figure 19). i. The following screen will be displayed: KEEP THIS READING? 1.YES 2.NO Press the [1] key (YES) to save the reading. j. The following screen will be displayed: TEST SAVED Press any key to continue. k.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL The following confirmation screen will then be displayed: RECORD NUMBER 4 HAS BEEN SAVED! Press any key to return to the “START-UP” menu. Figure 18. Y to Delta Test Results Printout - Column Format (ATRT-03 and ATRT-03A only) Table 10. Descriptions of Y to Delta Test Results Elements (Column Format) Item Number 44 Description 1 Test record date and time. 2 Test record header information (see section 3.6.1). 3 Test voltage.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Figure 19.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Table 11. Descriptions of Y to Delta Test Results Elements (Detailed Format) Item Number 46 Description 1 Test record date and time. 2 Test record header information (see section 3.6.1). 3 Test voltage. 4 Type of transformer under test. 5 Test H1-H0 and X1-X2 section heading. 6 H1-H0 tap voltage. 7 X1-X2 tap voltage. 8 H1-H0, X1-X2 calculated ratio. 9 H1-H0, X1-X2 measured ratio.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.6.4. Performing a Special Transformer Test The ATRT-03 can test 67 transformer types defined by ANSI, CEI/IEC and Australian standards. Follow the steps below to perform a test on one of these transformer types (See Appendix B, C, and D for a list of supported transformer types and their corresponding special test numbers): a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 2. SCROLL TO SELECT Press the [2] key (SCROLL TO SELECT) to scroll through the list of supported transformer types. The following screen will be displayed: SPECIAL TEST LISTING “UP” TO SCROLL FWD “DWN” TO SCROLL RVS Press the [PAPER ∧ Contrast] or [PAPER ∨ Contrast] key to scroll through the list of special transformer types. Press the [ENTER] key when you have found the transformer type that you would like to test. Continue to step d. d.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Press the [ENTER] key. The following screen will be displayed: ENTER X WINDING NAME-PLATE VOLTAGE: V Type the X winding name plate voltage value using the numeric keypad. The screen will be updated as shown below: ENTER X WINDING NAME-PLATE VOLTAGE: 100 V Press the [ENTER] key. Continue to step e. 2. NO Press the [2] key (NO) if you do not want to enter the transformer name plate voltage values. Continue to step e. e.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL g. The Phase A test will be performed and the results will be displayed on the screen temporarily as shown: Dy11 XFMR +10.021 0011 PLEASE WAIT... The following screen will then be displayed: JUMPER H1-H2 “ENTER” to CONTINUE Follow the instructions displayed on the LCD screen and then press the [ENTER] key. h. The Phase B and C tests will be performed and all results will be displayed on the screen temporarily as shown: RATIO +100.04 +100.06 +100.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 k. The following screen will be displayed: KEEP THIS READING? 1.YES 2.NO Press the [1] key (YES) to save the reading. l. The following screen will be displayed: TEST SAVED Press any key to continue. m. The following screen will be displayed: RUN ANOTHER TEST? 1.YES 2.NO Press the [2] key (NO). n. The following screen will be displayed: SAVE THIS RECORD? 1.YES 2.NO Press the [1] key (YES). o.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Figure 20.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.6.5. Performing a Quick Test The quick test mode can be used to initiate a transformer ratio test by pressing only two keys. Follow the steps below to perform a quick test: a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [5] key (QUICK TST). b. The following screen will be displayed: SINGLE PHASE XFORMER 1.START TEST 2.CHANGE XFMR 1.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL c. The following screen will be displayed: XFMR NAME PLATE VLTG 1.YES 2.NO 1. YES Press the [1] key (YES) if you would like to enter the transformer name plate voltage values. The following screen will be displayed: ENTER H WINDING NAME-PLATE VOLTAGE: V Type the H winding name plate voltage value using the numeric keypad. The screen will be updated as shown below: ENTER H WINDING NAME-PLATE VOLTAGE: 2,400 V Press the [ENTER] key.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 d. The following screen will be displayed (screen will vary depending on the transformer type selected): Y to DELTA XFORMER 1.START TEST 2.CHANGE XFORMER Press the [1] key (START TEST). e. The ATRT-03 will perform the selected test and display the test results on the LCD screen as shown below: RATIO +10.009 mA % DIFF 0005 0.09 Single Phase Test Results Example RATIO mA +10.022 0013 +10.008 0012 +10.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.6.6. Testing a Three Phase Transformer Using Auto Detect Mode The ATRT-03 provides a convenient Auto Detect mode that can automatically detect 130 specific vector groups for different transformer types defined by ANSI, CEI/IEC, and Australian standards. The transformer configurations supported are listed in Appendix B, C, and D. The ATRT-03 can detect the vector diagrams for Delta-Delta, Wye-Wye, Delta-Wye, and Wye-Delta transformer types.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 e. The following screen will be displayed while the unit determines the transformer configuration: Y-dT AUTO DETECT TESTING YNd1 PHS 1 The ATRT-03 will start testing the transformer configurations starting with YNd1. If the transformer is not a type YNd1, it will continue to test for the next type (YNd3, YNd5, etc.) until the transformer type has been determined.
REV 7 i. ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL The following screen will be displayed: KEEP THIS READING? 1.YES 2.NO Press the [1] key (YES) to save the reading. j. The following screen will be displayed: TEST SAVED Press any key to continue. k. The following screen will be displayed: RUN ANOTHER TEST? 1.YES 2.NO Press the [2] key (NO). l. The following screen will be displayed: SAVE THIS RECORD? 1.YES 2.NO Press the [1] key (YES). m.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.7 REV 7 Working With Test Records 3.7.1. Restoring a Test Record From Flash EEPROM Use the steps below to restore a test record from the ATRT-03’s Flash EEPROM to the working memory: a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.RESTORE RECORD 4.NEXT PAGE Press the [3] key (RESTORE RECORD). c.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Type the record number using the alpha-numeric keypad and then press the [ENTER] key. 1.2. The following screen will be displayed: RECORD RESTORED! Press any key to continue. If using an ATRT-03 or ATRT-03A, continue to step 1.3. If using an ATRT-03B, continue to step 1.4. 1.3. The following screen will be displayed: REVIEW RECORD 1.SCROLL TEST RECORD 2.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 1.4. REV 7 The basic information about the restored test record will be displayed as shown: RECORD ID INFO: SIEMENS Press the [PAPER ∨ Contrast] key. The test record details will be displayed as shown: Y to DELTA XFORMER 1 TAPS 08/25/10 07:32:21 TEST VTG = 40 Press the [PAPER ∨ Contrast] key again to view the test data: 1 RATIO mA +10.021 0010 +10.002 0010 +10.022 0011 % DIFF Press the [STOP] key to return to the “START-UP” menu.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.7.2. Reviewing a Test Record You can print (ATRT-03 and ATRT-03A only) or display (all models) a test record at the time that it is restored, or you can restore it to the working memory and review it later. To print or display the current test record in the working memory: a. Perform a test or restore a test record to the working memory (see section 3.4) and then start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 d. The basic information about the restored test record will be displayed as shown below: RECORD ID INFO: SIEMENS Press the [PAPER ∨ Contrast] key. The test record details will be displayed as shown below: Y to DELTA XFORMER 1 TAPS 08/25/10 07:32:21 TEST VTG = 40 Press the [PAPER ∨ Contrast] key again to view the test data: 1 RATIO mA +10.021 0010 +10.002 0010 +10.022 0011 % DIFF Press the [STOP] key to return to the “START-UP” menu.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.7.3. Printing or Viewing the Test Record Directory Follow the steps below to print a directory of the test records stored in the unit’s Flash EEPROM (ATRT-03 and ATRT-03A only) or view the directory on the LCD screen (ATRT-03B): a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.RESTORE RECORD 4.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 e. The following screen will be displayed: RECORDS DIRECTORY “UP” TO SCROLL FWD “DWN” TO SCROLL RVS Press either the [PAPER ∧ Contrast] key or the [PAPER ∨ Contrast] key to scroll through the test record directory. The test record header information will be displayed as shown below: #1 08/26/10 07:58 SGL PHASE TAPS:1 Press the [STOP] key when you are down browsing through the test record directory. You will be returned to the “START-UP” menu.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Figure 21.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.7.4. REV 7 Erasing Test Records from the Flash EEPROM Follow the steps below to erase test records from the Flash EEPROM: a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.RESTORE RECORD 4.NEXT PAGE Press the [3] key (RESTORE RECORD). c. The following screen will be displayed: 1.RESTORE RECORD 2.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Type the record number that you would like to erase using the alpha-numeric keypad and then press the [ENTER] key. If you do not know the test record number, you can first print or view a test record directory using the instructions in section 3.7.3 and Error! Reference source not found., respectively. The following screen will be displayed while the record is being erased: ERASING RECORD NUMBER: 1 PLEASE WAIT...
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.8 REV 7 Working With Test Plans The ATRT-03 comes with the Vanguard Transformer Turns Ratio Analyzer software (TTRA) that can be used to create transformer test plans on a PC (see the TTRA software manual for details). Test plans can then be transferred to the ATRT-03 and used to quickly perform tests. 3.8.1. Performing a Test Using a Transformer Test Plan Follow the steps below to perform a test using a test plan: a. Start from the “START-UP” menu: 1.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL e. The following screen will be displayed: LOAD TEST PLAN 1.ENTER PLAN NUMBER 2.SCROLL TO SELECT 1. ENTER PLAN NUMBER Press the [1] key (ENTER PLAN NUMBER) if you know the test plan number that you would like to use. The following screen will be displayed: LOAD TEST PLAN NUMBER: Type the test plan number to load from the unit’s Flash EEPROM and then press the [ENTER] key. The test plan will be loaded and you will be returned to the “START-UP” menu.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 f. Start from the “START-UP” menu again to run a test using the loaded test plan from the previous steps: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [1] key (TEST XFMR). g. The following screen will be displayed (test details will differ depending on the test type defined in the test plan): #1 Y-DELTA TAPS:20 TEST PLAN LOADED 1.CONTINUE 2.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL For each phase (A, B, and C) a “P” or “F” will be displayed to indicate Pass or Fail, respectively. NOTE Press any key to continue. If using an ATRT-03 or ATRT-03A, continue to step k. If using an ATRT-03B, continue to step m. k. The following screen will be displayed: PRINT TEST RESULTS? 1.YES 2.NO Press the [1] key (YES) to print the test results. l. The following screen will be displayed: PRINT FORMAT? 1.COLUMN 2.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 o. If the test plan included multiple tests, the start-up screen for the next test will be displayed as shown: TAP NUMBER 2 H VTG: 1500 X VTG: 150 “START” to RUN TEST Repeat steps i through n for this test. p. The following screen will be displayed after the last defined test in the test plan has been performed: END OF TEST PLAN Press any key to continue. q. The following screen will be displayed: SAVE THIS RECORD? 1.YES 2.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Figure 22.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 3.8.2. Unloading a Test Plan From the Working Memory Follow the steps below to unload a test plan from the working memory: a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.RESTORE RECORD 4.NEXT Press the [4] key (NEXT). c. The following screen will be displayed: 1.COMPUTER CONTROL 2.SET TIME 3.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.8.3. Printing or Viewing the Test Plan Directory Follow the steps below to print a directory of the test plans stored in the unit’s Flash EEPROM (ATRT-03 and ATRT-03A only) or to view the test plan directory on the LCD screen (ATRT-03B): a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Press either the [PAPER ∧ Contrast] or [PAPER ∨ Contrast] key to scroll forward or reverse through the test plan directory. The test plan header will be displayed: 1 Y-DELTA TAPS:20 Siemens Press the [STOP] key when you are done browsing the test plan directory. You will be returned to the “START-UP” menu.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 3.8.4. Printing a Test Plan (ATRT-03 and ATRT-03A Only) Follow the steps below to print a test plan from the internal Flash EEPROM (ATRT-03 and ATRT03A only): a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [2] key (SETUP). b. The following screen will be displayed: 1.ENTER XFMR ID 2.REVIEW RECORD 3.RESTORE RECORD 4.NEXT PAGE Press the [4] key (NEXT PAGE). c.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 e. The following screen will be displayed: PRINT TEST PLAN 1.ENTER PLAN NUMBER 2.SCROLL TO SELECT 1. ENTER PLAN NUMBER Press the [1] key (ENTER PLAN NUMBER) if you know the test plan number that you would like to print. The following screen will be displayed: PRINT TEST PLAN NUMBER: Type the test plan number using the alpha-numeric keypad and then press the [ENTER] key.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Figure 23.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL 4.0 DIAGNOSTICS, VERIFICATION, AND TROUBLESHOOTING 4.1 Performing an H and X Cable Diagnostic Test REV 7 Use the steps below to perform a diagnostic test on the H and X cables: a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [4] key (DIAG). b. The following screen will be displayed: 1.CABLE TEST 2.VERIFICATION TEST 3.AUTO-DETECT XFMR Press the [1] key (CABLE TEST). c.
REV 7 4.2 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL Performing a Verification Test Use the steps below to perform a verification test on the ATRT-03’s electronics: a. Start from the “START-UP” menu: 1.TEST XFMR 08/23/10 2.SETUP 08:25:15 3.CALCULATOR 4.DIAG 5.QUICK TST Press the [4] key (DIAG). b. The following screen will be displayed: 1.CABLE TEST 2.VERIFICATION TEST 3.AUTO-DETECT XFMR Press the [2] key (VERIFICATION TEST). c.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 Y TO Y TEST The screen will then be updated with the test results for each phase: RATIO +1.0000 +1.0000 +1.0000 mA % DIFF 0001 0001 0001 The ratio reading should be 1.0000 ±0.1% for all tests. NOTE Press any key to return to the “START-UP” menu.
REV 7 ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL APPENDIX A – TRANSFORMER VECTOR GROUP CODES Utility power transformers manufactured in accordance with IEC specifications have a Rating Plate attached in a visible location. This plate contains a list of the transformer's configuration and operating specifications. One such rating is the winding configuration and phasedisplacement code. This code follows a convention that comprises letter and number sets that denote three-phase winding configurations (i.
ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 APPENDIX B – Common ANSI Transformer Descriptions 85
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ATRT-03, ATRT-03A, AND ATRT-03B USER’S MANUAL REV 7 APPENDIX C – CEI/IEC 60076-1 Transformer Descriptions 93
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1520 S. Hellman Ave • Ontario, CA 91761 • USA Phone: 909-923-9390 • Fax: 909-923-9391 www.vanguard-instruments.com Copyright © 2010 by Vanguard Instruments Company, Inc. ATRT-03/03A/03B User’s Manual • Revision 7.
