Vanguard Instruments LTCA-10 User Manual
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Vanguard Instruments LTCA-10 User Manual

Load tap changer analyzer
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LOAD TAP CHANGER ANALYZER
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761
TEL: (909) 923-9390
FAX: (909) 923-9391
USER'S MANUAL
for the
LTCA-10™
LTCA-40™
March 2009
Rev. 2.1

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  • Page 1 USER’S MANUAL for the LTCA-10™ LTCA-40™ LOAD TAP CHANGER ANALYZER Vanguard Instruments Company, Inc. 1520 S. Hellman Ave. Ontario, California 91761 TEL: (909) 923-9390 March 2009 FAX: (909) 923-9391 Rev. 2.1...
  • Page 2 Any deviation from the procedures described in this User’s Manual may create one or more safety hazards, may damage the LTCA-10/40, 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 LTCA-10/40.

  • Page 3: Table Of Contents

    TECHNICAL SPECIFICATIONS ..................8 LTCA-10 Technical Specifications .................. 8 LTCA-40 Technical Specifications .................. 9 CONTROLS AND INDICATORS..................10 LTCA-10 Controls and Indicators .................. 10 LTCA-40 Controls and Indicators .................. 12 PRE-TEST SETUP ......................14 Operating Voltages ......................14 LTCA-10/40 LCD Contrast Control ................14 LTCA-10/40 Printer Paper Control ................
  • Page 4 Figure 1.0 LTCA-10 Controls and Indicators ................10 Figure 2.0 LTCA-40 Controls and Indicators ................12 Figure 3.0 Typical LTCA-10 Connection Diagram (Dynamic Resistance Test) ......15 Figure 4.0 Typical LTCA-40 Connection Diagram (Dynamic Resistance Test) ......16 Figure 5.0 Typical LTCA-40 Connection Diagram (2 Windings) ..........17 Figure 6.0 Typical LTCA-40 Connection Diagram (3 Windings) ..........

  • Page 5: Conventions Used In This Document

    CONVENTIONS USED IN THIS DOCUMENT This document uses the following conventions: [KEY] • A key or switch on the LTCA-10/40 is indicated as • Menu options are referenced as (MENU OPTION) • Screen and menu names are referenced as “SCREEN/MENU NAME”...

  • Page 6: Introduction

    LCD screen. A special current source allows the LTCA-10 to output 1, 5 and 10 Amperes of test current. The LTCA-40 can output 1, 5, 10 or 40 Amperes of test current. For added safety, the current source...

  • Page 7: Furnished Accessories

    Furnished Accessories The LTCA-10/40 is furnished with eight 50-foot test cables with “quick disconnect” type test plugs on the unit end and battery-type clamps at the test load end. One power cord, one ground cable, one current sense cable, one LTC operation cable and a cable-carrying bag is also included.

  • Page 8: Technical Specifications

    LTCA-10/LTCA-40 USER’S MANUAL TECHNICAL SPECIFICATIONS LTCA-10 Technical Specifications Table 1.0 LTCA-10 Specifications TYPE Load tap changer analyzer PHYSICAL SPECIFICATIONS 21”W x 9” H x 17”D (53 cm x 24 cm x 43 cm); Weight: 33 lbs (15.4 kg) OPERATING VOLTAGE 100 –...

  • Page 9: Ltca-40 Technical Specifications

    LTCA-10/LTCA-40 USER’S MANUAL LTCA-40 Technical Specifications Table 2.0 LTCA-40 Specifications TYPE Load tap changer analyzer PHYSICAL SPECIFICATIONS 25”W x 8.5”H x 20”D (63.5 cm x 21.6 cm x 50 cm); Weight: 46 lbs (20 kg) OPERATING VOLTAGE 100 – 240 Vac, 50/60 Hz RESISTANCE READING 1 micro-ohm –...

  • Page 10: Controls And Indicators

    CONTROLS AND INDICATORS LTCA-10 Controls and Indicators The LTCA-10’s controls and indicators are shown in Figure 1.0 below. A leader line with an index number points to each control and indicator, which is cross-referenced to a functional description in Table 3.0. The table describes the function of each item on the control-panel. The purpose of the controls and indicators may seem obvious, but users should become familiar with them before using the LTCA-10/40.

  • Page 11: Table 3.0 Functional Descriptions Of Ltca-10 Controls And Indicators

    LTCA-10/LTCA-40 USER’S MANUAL Table 3.0 Functional Descriptions of LTCA-10 Controls and Indicators Item Panel Markings Functional Description Number AC Current Clamp-on AC current probe connector USB Interface Port Flash Drive USB Flash Drive Interface Port None Air Vents 120-240 7.5A, 50-60...

  • Page 12: Ltca-40 Controls And Indicators

    LTCA-10/40. Accidental misuse of the controls will usually cause no serious harm. Users should also be familiar with the safety summary found on the front page of this User’s Manual.

  • Page 13: Table 4.0 Functional Descriptions Of Ltca-40 Controls And Indicators

    LTCA-10/LTCA-40 USER’S MANUAL Table 4.0 Functional Descriptions of LTCA-40 Controls and Indicators Item Panel Markings Functional Description Number AC Current Clamp-on AC current probe connector USB Interface port The air intake cooling fans maintain the internal temperature. There are output...

  • Page 14: Pre-Test Setup

    LTCA-10/40 Printer Paper The LTCA-10/40’s built-in thermal printer uses 4.5-inch wide thermal paper for printing test results. To maintain the highest print quality and to avoid paper jams, the use of thermal paper supplied by Vanguard Instruments Company is highly recommended. Additional paper can be ordered from the following sources: Vanguard Instruments Co, Inc.

  • Page 15: Operating Procedures

    LTCA-10/LTCA-40 USER’S MANUAL OPERATING PROCEDURES The LTCA-10/40 is simple to operate and only requires the selection of choices from display menus and responding to displayed prompts. However, first-time operators should review the following operating procedures to become familiar with all LTCA-10/40 operations and the logical branching for various test options.

  • Page 16: Ltca-40 Cable Connections

    LTCA-10/LTCA-40 USER’S MANUAL LTCA-40 Cable Connections Typical connection diagrams of the LTCA-40 are shown in Figure 4.0, 5.0, and 6.0. Do not touch or disconnect any test lead that is connected to a transformer terminal while high current is being conducted during a test. Failure to heed this...

  • Page 17: Figure 5.0 Typical Ltca-40 Connection Diagram (2 Windings)

    LTCA-10/LTCA-40 USER’S MANUAL Figure 5.0 Typical LTCA-40 Connection Diagram (2 Windings)

  • Page 18: Figure 6.0 Typical Ltca-40 Connection Diagram (3 Windings)

    LTCA-10/LTCA-40 USER’S MANUAL Figure 6.0 Typical LTCA-40 Connection Diagram (3 Windings)

  • Page 19: General Procedures

    LTCA-10/LTCA-40 USER’S MANUAL General Procedures a. Ground the LTCA-10/40 to substation ground (Item 6 in Figure 1.0, Item 5 in figure 2.0). Always connect the LTCA-10/40 to the substation ground before connecting test leads to any transformer bushing. Failure to follow this procedure may damage the LTCA-10/40.

  • Page 20: Performing A Resistance Test

    LTCA-10/LTCA-40 USER’S MANUAL Performing a Resistance Test a. Start from the “START-UP” menu: 1. TEST XFMR 03/04/09 2. SETUP 09:28:03 3. USER DIAG Press the key (TEST XFMR) to start a test. b. The following menu will be displayed: 1. RESISTANCE TEST 2.
  • Page 21 LTCA-10/LTCA-40 USER’S MANUAL a. Press the key to select copper as the winding material. Continue to step f. b. Press the key to select aluminum as the winding material. Continue to step f. c. Press the key to manually enter the Tk value. The following screen will be displayed: 230.0°C...
  • Page 22 LTCA-10/LTCA-40 USER’S MANUAL The LTCA-10/40 will calculate the equivalent resistance value at this new temperature. NOTE h. The following “WARNING” screen will be displayed: *********WARNING********* DANGEROUS FLASH-OVER WILL OCCUR IF CABLES ARE DISCONNECTED! ************************* This warning reminds the operator that the next sequence of test steps will run current through the test load.
  • Page 23 R1 = 7.272 mΩ R2 = 358μΩ * XFMR ENERGIZED! * The LTCA-10/40 will continue the test and update the resistance values on the LCD [ENTER] screen. While the test is in progress, the key can be pressed to save the current reading on the LCD to the LTCA-10/40’s internal working memory.
  • Page 24 (YES) to print the test results on the built-in thermal printer. The last test results displayed on the LCD screen will be printed. Typical LTCA-10/40 test reports are shown in Figure 7.0, Figure 8.0, and Figure 9.0. Continue to step 2.
  • Page 25 LTCA-10/LTCA-40 USER’S MANUAL only save the current test results and discard any previous data from the working memory. [ENTER] In either case, press the key and continue to step n. 2. NO If you do not wish to save the reading, press the key (NO) and continue to step n.
  • Page 26 LTCA-10/LTCA-40 USER’S MANUAL p. The following message will be displayed: RECORD NUMBER 01 HAS BEEN SAVED! The record number is automatically assigned and incremented by the LTCA- 10/40. NOTE [ENTER] Press the key to return to the “START-UP” menu.

  • Page 27: Resistance Test Result Printouts

    LTCA-10/LTCA-40 USER’S MANUAL 5.4.1. Resistance Test Result Printouts Figure 7.0 Typical Triple Reading Test Report Printout Figure 8.0 Typical Dual Reading Test Report Printout...

  • Page 28: Figure 9.0 Typical Single Reading Test Report Printout

    LTCA-10/LTCA-40 USER’S MANUAL Figure 9.0 Typical Single Reading Test Report Printout...

  • Page 29: Performing A Special Resistance Test

    The “ENTER SPECIAL TEST TIME MINUTES” screen will be displayed: ENTER SPECIAL TEST TIME MINUTES (1-45): Enter the test time (between 1-45 minutes) using the keypad on the LTCA-10/40 and then [ENTER] press the key. Ten (10) minutes is used for the test time in this example.
  • Page 30 LTCA-10/LTCA-40 USER’S MANUAL 1. YES If you wish to convert readings to standard temperature, press the key (YES). The “WINDING MATERIAL” menu will be displayed: WINDING MATERIAL 1. COPPER, Tk=234.5 2. ALUMINUM, Tk=225.0 3. MANUALLY ENTER Tk a. Press the key to select copper as the winding material.
  • Page 31 Use the keys to adjust the [ENTER] Reference Temperature. Press the key to confirm the temperature selection. The LTCA-10/40 will calculate the equivalent resistance value at this new temperature. NOTE i. The following “WARNING” screen will be displayed: *********WARNING********* DANGEROUS FLASH-OVER...
  • Page 32 6.1 for instructions on how to select this option. NOTE k. The LTCA-10/40 determines when the resistance reading is stable and shows the resistance value on the LCD as follows (the first line shows the remaining test time): REMAINING TIME=10:00 = 1.09 AMPS...
  • Page 33 LTCA-10/LTCA-40 USER’S MANUAL The test record must be saved to Flash EEPROM so that it can be recalled and printed at a later time. NOTE 1. YES If you wish to save the record, press the key (YES) and continue to step m.

  • Page 34: Special Resistance Test Result Printout

    LTCA-10/LTCA-40 USER’S MANUAL 5.5.1. Special Resistance Test Result Printout Figure 10.0 Typical Single Reading Test Report Printout...

  • Page 35: Performing A Dynamic Ltc Test

    Select the shot time by pressing the corresponding key on the LTCA-10/40’s keypad , or d. The “SELECT TEST CURRENT” menu will be displayed as shown below. The LTCA- 10 offers a selection of 5 or 10 Amps while the LTCA-10 offers a selection of 10 or 40 AMPS. SELECT TEST CURRENT: SELECT TEST CURRENT: 1.
  • Page 36 The LTCA-10/40 determines when the resistance reading is stable and displays the “READY TO CAPTURE DATA” screen: READY TO CAPTURE DATA PRESS “ENTER”...
  • Page 37 LTCA-10/LTCA-40 USER’S MANUAL [LTC RAISE] If the LTC cable is connected, then pressing the key when cycling from [LTC LOWER] lower to higher taps or pressing the key when cycling from higher to lower taps will start capturing data. The following screen will be displayed indicating that the test is in progress:...
  • Page 38 LTCA-10/LTCA-40 USER’S MANUAL 1. YES An expansion plot graphs the resistance waveform in more detail by allowing the selection of a timeframe to be plotted using an appropriate resistance scale. Press key (YES) to print an expansion plot. The following menu will be displayed: 1.
  • Page 39 LTCA-10/LTCA-40 USER’S MANUAL The test record must be saved to Flash EEPROM so that it can be recalled and printed at a later time. NOTE 1. YES If you wish to save the record, press the key (YES) and continue to step k.

  • Page 40: Dynamic Ltc Test Result Printouts

    LTCA-10/LTCA-40 USER’S MANUAL 5.6.1. Dynamic LTC Test Result Printouts Figure 11.0 Sample Normal Dynamic LTC Test Plot...

  • Page 41: Figure 12.0 Sample Dynamic Ltc Test Expansion Plot

    LTCA-10/LTCA-40 USER’S MANUAL Figure 12.0 Sample Dynamic LTC Test Expansion Plot...

  • Page 42: Diagnostic Mode

    In diagnostic mode, the LTCA-10/40 can run a resistance test, display the sense voltages, and test current on the LTCA. This feature can be used to verify the LTCA-10/40’s voltage and current readings against an external meter. Use the steps below to initiate a diagnostic test.
  • Page 43 LTCA-10/LTCA-40 USER’S MANUAL e. The V1, V2, and V3 test currents will be displayed as shown below: V1 = 07.53mV V2 = 08.23mV V3 = 09.12mV = 01.091A [STOP] Press the key to end the diagnostic test and return to the “START-UP” menu.

  • Page 44: Setup Menu

    LTCA-10/LTCA-40 USER’S MANUAL Setup Menu The setup menu is used to configure the LTCA-10/40 and to also recall and print stored test records. This section outlines the procedures for accessing and using the Setup Menu options. 5.8.1. Entering the Transformer ID Transformer information can be entered using the steps outlined below.
  • Page 45 LTCA-10/LTCA-40 USER’S MANUAL Enter the station name by using the LTCA-10/40’s alpha-numeric keypad, and then press [ENTER] key. e. The “CIRCUIT” screen will be displayed: CIRCUIT: ↑/↓ TO POSITION “ENTER TO ACCEPT” Enter the circuit name by using the LTCA-10/40’s alpha-numeric keypad, and then press [ENTER] key.
  • Page 46 The “OPERATOR” screen will be displayed: OPERATOR: ↑/↓ TO POSITION “ENTER TO ACCEPT” Enter the name of the operator by using the LTCA-10/40’s alpha-numeric keypad, and [ENTER] then press the key. You will be returned to the “START-UP” menu.

  • Page 47: Restoring A Test Record

    LTCA-10/LTCA-40 USER’S MANUAL 5.8.2. Restoring a Test Record Use the following steps to restore a test record from the LTCA-10/40’s Flash EEPROM to the unit’s working memory. a. Start from the “START-UP” menu: 1. TEST XFMR 03/04/09 2. SETUP 09:28:03 3.
  • Page 48 LTCA-10/LTCA-40 USER’S MANUAL 2. SCROLL TO SELECT Press the key if you want to scroll through the LTCA-10/40’s record directory to find the record number. The “RECORDS DIRECTORY” screen will be displayed: RECORDS DIRECTORY “UP” TO SCROLL FWD “DWN” TO SCROLL RVS [PAPER ∧...

  • Page 49: Figure 13.0 Typical Test Record Printout

    LTCA-10/LTCA-40 USER’S MANUAL Figure 13.0 Typical Test Record Printout...

  • Page 50: Printing The Test-Record Directory

    LTCA-10/LTCA-40 USER’S MANUAL 5.8.3. Printing the Test-Record Directory A directory of all the test records stored in the LTCA-10/40’s Flash EEPROM can be printed on the thermal printer using the steps below. a. Start from the “START-UP” menu: 1. TEST XFMR 03/04/09 2.

  • Page 51: Figure 14.0 Typical Record Directory Printout

    LTCA-10/LTCA-40 USER’S MANUAL Figure 14.0 Typical Record Directory Printout...

  • Page 52: Erasing A Test Record

    LTCA-10/LTCA-40 USER’S MANUAL 5.8.4. Erasing a Test Record Follow the steps below to erase a single test record or the entire directory of test records from the LTCA-10/40’s Flash EEPROM. a. Start from the “START-UP” menu: 1. TEST XFMR 03/04/09 2.
  • Page 53 2. ERASE ALL RECORDS Press the key (ERASE ALL RECORDS) to erase all records stored in the LTCA-10/40’s memory. The following confirmation screen will be displayed: ERASE ALL RECORDS! ARE YOU SURE? “ENTER” TO CONTINUE...

  • Page 54: Enabling The Computer Interface

    EEPROM to a PC via the RS-232C or USB port. To use this mode, first run the provided PC software and then connect the PC to the RS-232C or USB port on the LTCA-10/40. The software will automatically make the connection to the LTCA-10/40.

  • Page 55: Setting The Date And Time

    LTCA-10/LTCA-40 USER’S MANUAL 5.8.6. Setting the Date and Time a. Start from the “START-UP” menu: 1. TEST XFMR 03/04/09 2. SETUP 09:28:03 3. USER DIAG Press the key (SETUP). b. The following menu will be displayed: 1. ENTER XFMR ID 2.

  • Page 56: Setting The Test Value Display Font

    LTCA-10/LTCA-40 USER’S MANUAL 5.8.7. Setting the Test Value Display Font The font used to display test values on the screen can be made bold for better visibility. This only affects the test values displayed during testing and does not affect any other text such as menu items.

  • Page 57: Ltca-10/40 Special Features

    The LTCA-10/40 has a built-in 3 minute minimum delay between the start of the test and when the resistance value is displayed on the LCD. This feature eliminates the possibility of early erroneous readings.
  • Page 58 LTCA-10/LTCA-40 USER’S MANUAL 1520 S. Hellman Ave • Ontario, CA 91761 • USA Phone: 909-923-9390 • Fax: 909-923-9391 www.vanguard-instruments.com LTCA-10/40™ User’s Manual • Version 2.1 • March 17, 2009 Copyright © 2009 by Vanguard Instruments Company, Inc.

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