Vanguard Instruments CVT-765 User Manual Download

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CVT-765

Capacitor Voltage Transformer Ratio Tester

USER’S MANUAL

Vanguard Instruments Company, Inc.

1520 S. Hellman Ave.
Ontario, California 91761, USA

TEL: (909) 923-9390
FAX: (909) 923-9391

May 2011

Revision 1

Summary of Contents for CVT-765

Page 1: ...CVT 765 Capacitor Voltage Transformer Ratio Tester USER S MANUAL Vanguard Instruments Company Inc 1520 S Hellman Ave Ontario California 91761 USA TEL 909 923 9390 FAX 909 923 9391 May 2011 Revision 1 ...

Page 2: ... to a transformer Do not perform test procedures or service unless another person is also present who is capable of rendering aid and resuscitation DO NOT MODIFY TEST EQUIPMENT To avoid the risk of introducing additional or unknown hazards do not install substitute parts or perform any unauthorized modification to any CVT 765 test unit To ensure that all designed safety features are maintained it ...

Page 3: ...ion 11 3 5 2 Performing a Transformer Test 15 3 6 Working With Test Records 20 3 6 1 Viewing the Contents of the Working Memory 20 3 6 2 Saving Test Results to a Test Record 21 3 6 3 Restoring a Test Record From Flash EEPROM 24 3 6 4 Restoring a Test Record From a USB Flash Drive 28 3 6 5 Copying Test Records to a USB Flash Drive 31 3 6 6 Viewing the Test Record Directory 34 3 6 7 Erasing Test Rec...

Page 4: ...MENU NAME CVT 765 LCD screen output is shown as When instructions are provided the menu item that should be selected is outlined with a rectangle 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 O...

Page 5: ...age error by comparing the test results with the nameplate voltage values This convenient feature eliminates any user calculation errors when testing transformers User Interface The CVT 765 features a back lit LCD screen 128 x 64 pixels that is viewable in bright sunlight and low light conditions A rugged 16 key membrane keypad is used to enter test information and to operate the unit Test Record ...

Page 6: ...ble in direct sunlight and low light levels COMPUTER INTERFACE RS 232C PC SOFTWARE Windows XP Vista 7 Transformer Analysis Software included with purchase INTERNAL TEST RECORD STORAGE 128 test records Each record contains 33 readings EXTERNAL TEST RECORD STORAGE Up to 999 test records on external USB Flash drive SAFETY Designed to meet IEC 61010A 1 and CAN CSA C22 2 No 1010 1 92 Standards ENVIRONM...

Page 7: ...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 CVT 765 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 CVT 765 Cont...

Page 8: ... x 64 pixels viewable in direct light and low light conditions 6 VOLTAGE SELECTOR Voltage selection switch 7 120 240 Vac 4A 50 60 Hz Fuse 250Vac 5A Fast Blow Input power connector and fused power switch with third wire safety ground 8 Rugged alpha numeric keypad 9 7500VAC PRESENT 7500VAC hazard warning LED This LED will be lit when a test is being performed to remind the user that 7500VAC is prese...

Page 9: ...election switch on the front panel see Figure 1 2 2 LCD Screen Contrast Control To increase the LCD screen contrast press and hold the Contrast key for two seconds Release the button when the desired contrast level has been reached To decrease the LCD screen contrast press and hold the Contrast key for two seconds Release the button when the desired contrast level has been reached ...

Page 10: ...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 CVT 765 All transformer bus connections must be removed and the transformer must be isolated before performing any tests 3 1 Connection Diagram Figure 2 Typical CVT 765 Cable Connections ...

Page 11: ...be displayed Enter the date using the alpha numeric keypad d The following screen will be displayed Enter the current time using the alpha numeric keypad When the complete time has been entered you will be immediately returned to the START UP menu ENTER TIME HH MM SS ENTER DATE MM DD YY 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set language 1 TEST TRANSFORMER 2...

Page 12: ...E c The following screen will be displayed Select the preferred interface language by pressing the corresponding key on the keypad 1 2 or 3 The interface language will be set and a confirmation screen will be displayed as shown below Press any key to return to the START UP menu ENGLISH SET 1 ENGLISH 2 TURKISH 3 SPANISH 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 ...

Page 13: ...50 60 HZ c The following screen will be displayed Select the preferred frequency by pressing the corresponding key on the keypad 1 or 2 The frequency will be set and a confirmation screen will be displayed as shown below Press any key to return to the START UP menu 60 hz set 1 60 Hz 2 50 hz 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set language 1 TEST TRANSFORM...

Page 14: ...ey RECORD ID c The following screen will be displayed Type the company name using the alpha numeric keypad When pressing a key the corresponding number on the key will be displayed first Pressing the key again will display the first letter on the key Pressing the key again will display the second letter on the key For example to type the letter A you must press the 2 key twice To erase the charact...

Page 15: ...ric keypad and then press the ENTER key e The following screen will be displayed Type the circuit information using the alpha numeric keypad and then press the ENTER key f The following screen will be displayed Type the manufacturer name using the alpha numeric keypad and then press the ENTER key MANUFACTURER _ TO POSITION ENTER TO ACCEPT CIRCUIT _ TO POSITION ENTER TO ACCEPT STATION _ TO POSITION...

Page 16: ...lowing screen will be displayed Type the transformer s serial number using the alpha numeric keypad and then press the ENTER key i The following screen will be displayed Type the transformer s KVA rating using the alpha numeric keypad and then press the ENTER key KVA RATING _ TO POSITION ENTER TO ACCEPT SERIAL NUMBER _ TO POSITION ENTER TO ACCEPT MODEL _ TO POSITION ENTER TO ACCEPT ...

Page 17: ...ollowing screen will be displayed Type the operator s name using the alpha numeric keypad and then press the ENTER key All header information will be saved and you will be returned to the START UP menu OPERATOR _ TO POSITION ENTER TO ACCEPT ...

Page 18: ...pad c The following screen will be displayed NOTE If you had entered name plate voltages for a previous test the following screen will be displayed instead of the above screen Press the 3 key if you would like to use the name plate voltage values from the previous test performed Continue to step c TEST WINDING 1 X1 X3 2 X2 X3 3 Y1 Y3 4 Y2 Y3 5 Z1 Z3 6 Z2 Z3 NAME PLATE VOLTAGE 1 YES 2 NO 3 USE PREV...

Page 19: ...ed as shown below Press the ENTER key The screen will be updated as shown below Type the X winding name plate voltage value using the numeric keypad The screen will be updated as shown below Press the ENTER key Continue to step c 2 NO Press the 2 key NO if you do not want to enter the transformer name plate voltage values Continue to step c NAME PLATE VOLTAGE H X 2 400 240 NAME PLATE VOLTAGE H X 2...

Page 20: ...yed on the LCD screen when testing has finished You can now release the ARM switch 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 NOTE The percentage error DIFF is calculated as the absolute value of Calculated Ratio Measured Ratio Calculated Ratio x 100 Press any key to continue RATIO DIFF 10 004 0 ...

Page 21: ...ecord was restored from Flash EEPROM or from a Flash drive the following screen will be displayed instead Press the 1 key APPEND PREV DATA to append the data in the unit s working memory to the current test results or press the 2 key CLEAR PREV DATA to clear any previous data from the unit s memory buffer and only save the current test results The following screen will then be displayed Press any ...

Page 22: ...EEPROM j The following screen will be displayed momentarily The following confirmation screen will then be displayed NOTE The unit will automatically assign the record number and will not over write existing test records Press any key to return to the START UP menu RECORD NUMBER 1 HAS BEEN SAVED SAVING RECORD PLEASE WAIT SAVE THIS RECORD 1 YES 2 NO RUN ANOTHER TEST 1 YES 2 NO 3 REPEAT PREV TEST ...

Page 23: ...ey SETUP b The following screen will be displayed Press the 3 key DISPLAY RECORD c The basic test record information will be displayed as shown d Press the Contrast key The test record details will be displayed as shown below Press the STOP key to return to the START UP menu 1 SINGLE PHASE 7440 volts RATIO DIFF 10 004 0 04 SINGLE PHASE Num Tests 1 04 15 11 09 52 50 1 RECORD ID 2 SET 50 60 HZ 3 DIS...

Page 24: ...not been turned off Follow the steps below to save the test results from the working memory to a test record the following procedure can also be used to re save a restored test record to a new memory location or to a USB Flash Drive a Perform a test or restore a test record to the working memory see section 3 6 3 and 3 6 4 and then start from the START UP menu Press the 2 key SETUP b The following...

Page 25: ...e to step e d The following screen will be displayed 1 SAVE INTERNALLY Press the 1 key SAVE INTERNALLY to save the test record to the unit s Flash EEPROM Continue to step e 2 SAVE TO THUMB DRIVE Press the 2 key SAVE TO THUMB DRIVE to save the test record to the connected USB Flash drive The following screen will be displayed Press any key to return to the START UP menu REC_001 SAVED TO THUMB DRIVE...

Page 26: ...CVT 765 USER S MANUAL REV 1 23 e The following screen will be displayed Press any key to return to the START UP menu RECORD NUMBER 5 HAS BEEN SAVED ...

Page 27: ...l be displayed Press the 4 key SAVE RESTORE RECORD c The following screen will be displayed NOTE Option 5 COPY TO THUMB DRIVE will be listed only if a USB Flash drive is connected to the CVT 765 Press the 1 key RESTORE RECORD 1 RESTORE RECORD 2 SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD 5 COPY to THUMB DRIVE 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set lang...

Page 28: ...reen will be displayed Continue with the steps below 1 ENTER RECORD NUMBER Press the 1 key ENTER RECORD NUMBER if you know the record number that you would like to restore 1 1 The following screen will be displayed Type the record number using the alpha numeric keypad and then press the ENTER key RESTORE RECORD NUMBER RESTORE RECORD 1 ENTER RECORD NUMBER 2 SCROLL TO SELECT 1 INTERNAL STORAGE 2 THU...

Page 29: ...yed as shown Press the STOP key to return to the START UP menu The restored test record will remain loaded in the working memory 2 SCROLL TO SELECT Press the 2 key SCROLL TO SELECT to scroll through a directory of the stored test records 2 1 The following screen will be displayed RECORDS DIRECTORY UP TO SCROLL FWD DWN TO SCROLL RVS 1 SINGLE PHASE 7440 volts RATIO DIFF 10 004 0 04 SINGLE PHASE Num ...

Page 30: ... to display the next or previous test record respectively The basic test record information will be displayed as shown When you have located the test record that you would like to restored press the ENTER key Continue to step 1 2 on page 26 1 04 15 11 09 52 SINGLE PHASE 1 TESTS ...

Page 31: ...s USB Flash drive port USB MEM port Then start from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 4 key SAVE RESTORE RECORD c The following screen will be displayed Press the 1 key RESTORE RECORD 1 RESTORE RECORD 2 SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD 5 COPY TO THUMB DRIVE 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET ...

Page 32: ...d and then press the ENTER key f The test record will be restored to the unit s working memory and the following screen will be displayed Press the 1 key YES to display the restored test record g The basic information about the restored test record will be displayed as shown below SINGLE PHASE Num Tests 1 04 15 11 09 52 50 REC_000 restored DISPLAY RECORD 1 YES 2 NO RESTORE THUMB DRIVE REC_ 1 INTER...

Page 33: ...the Contrast key The test record details will be displayed as shown below Press the STOP key to return to the START UP menu The restored test record will remain loaded in the working memory 1 SINGLE PHASE 7440 volts RATIO DIFF 10 004 0 04 ...

Page 34: ...EM port and then start from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 4 key SAVE RESTORE RECORD c The following screen will be displayed Press the 5 key COPY TO THUMB DRIVE 1 RESTORE RECORD 2 SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD 5 COPY TO THUMB DRIVE 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set language...

Page 35: ...ord will be copied to the USB Flash drive and the following screen will be displayed Press any key to return to the START UP menu 2 COPY ALL RECORDS Press the 2 key COPY ALL RECORDS to copy all test records from the CVT 765 s Flash EEPROM to the connected USB Flash drive All test records will be copied from the unit to the connected USB Flash drive The following screen will be displayed when the p...

Page 36: ...CVT 765 USER S MANUAL REV 1 33 Press any key to return to the START UP menu ALL RECORDS HAVE BEEN TRANSFERRED TO THUMB DRIVE ...

Page 37: ...en will be displayed Press the 4 key SAVE RESTORE RECORD c The following screen will be displayed NOTE Option 5 COPY TO THUMB DRIVE is listed only if a USB Flash drive is connected to the unit Press the 3 key RECORD DIRECTORY 1 RESTORE RECORD 2 SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD 5 COPY TO THUMB DRIVE 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set lang...

Page 38: ...gh the test record directory The test record header will be displayed as shown You can continue to scroll through the record directory by pressing the Contrast and Contrast keys Press the STOP key to return to the START UP menu SINGLE PHASE Num Tests 1 04 15 11 09 52 50 RECORDS DIRECTORY UP TO SCROLL FWD DWN TO SCROLL RVS ...

Page 39: ... key SETUP b The following screen will be displayed Press the 4 key SAVE RESTORE RECORD c The following screen will be displayed Press the 4 key ERASE RECORD 1 RESTORE RECORD 2 SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD 5 COPY TO THUMB DRIVE 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set language 1 TEST TRANSFORMER 2 SETUP TIME 15 16 17 DATE 05 17 11 ...

Page 40: ...isplayed Continue with the steps below 1 ERASE SINGLE REC Press the 1 key ERASE SINGLE REC to erase a single test record from the unit s internal Flash EEPROM The following screen will be displayed NOTE You can cancel the process and return to the START UP menu by pressing the STOP key ERASE RECORD NUMBER ERASE RECORD 1 ERASE SINGLE REC 2 ERASE ALL RECORDS STOP TO EXIT 1 ERASE INTERNAL REC 2 ERASE...

Page 41: ... been completely erased Press any key to continue You will be returned to the beginning of step d 2 ERASE ALL RECORDS Press the 2 key ERASE ALL RECORDS to erase all the test records from the unit s internal Flash EEPROM The following warning screen will be displayed You can press the STOP key to cancel the process and return to the START UP menu Press the ENTER key to proceed with deleting all the...

Page 42: ... 765 USER S MANUAL REV 1 39 The following screen will be displayed when all test records have been completely erased Press any key to return to the START UP menu RECORDS ERASED ERASing recordS PLEASE WAIT ...

Page 43: ...tart from the START UP menu Press the 2 key SETUP b The following screen will be displayed Press the 4 key SAVE RESTORE RECORD c The following screen will be displayed Press the 4 key ERASE RECORD 1 RESTORE RECORD 2 SAVE RECORD 3 RECORD DIRECTORY 4 ERASE RECORD 5 COPY TO THUMB DRIVE 1 RECORD ID 2 SET 50 60 HZ 3 DISPLAY RECORD 4 SAVE RESTORE RECORD 5 SET TIME 6 set language 1 TEST TRANSFORMER 2 SET...

Page 44: ...splayed Type the record number that you would like to erase using the alpha numeric keypad and then press the ENTER key The test record will be erased from the USB Flash drive and the following screen will be displayed Press any key to continue You will be returned to the beginning of step e Press the STOP key to return to the START UP menu THUMB DRIVE RE000 ERASED ERASE THUMB DRIVE REC_ ERASE REC...

Page 45: ... key if you do not want to erase all the test records You will be returned to the START UP menu Press the ENTER key to proceed with deleting all the test records from the connected USB Flash drive The following screen will be displayed when all the records have been erased Press any key to return to the START UP menu all thumb drive records erased ERASE ALL THUMB DRIVE RECORDS ARE YOU SURE ENTER T...

Page 46: ...20 S Hellman Ave Ontario CA 91761 USA Phone 909 923 9390 Fax 909 923 9391 www vanguard instruments com Copyright 2011 by Vanguard Instruments Company Inc CVT 765 User s Manual Revision 1 0 May 19 2011 TA ...

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