Vanguard LTCA-10_40 User Manual
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LTCA-10/LTCA-40 USER’S MANUAL
3
TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT .......................................................................... 5
1.0
INTRODUCTION ............................................................................................................... 6
1.1
General Description .......................................................................................................... 6
1.2
Functional Description ..................................................................................................... 6
1.3
Furnished Accessories ...................................................................................................... 7
2.0
TECHNICAL SPECIFICATIONS ...................................................................................... 8
2.1
LTCA-10 Technical Specifications .................................................................................. 8
2.2
LTCA-40 Technical Specifications .................................................................................. 9
3.0
CONTROLS AND INDICATORS.................................................................................... 10
3.1
LTCA-10 Controls and Indicators .................................................................................. 10
3.2
LTCA-40 Controls and Indicators .................................................................................. 12
4.0
PRE-TEST SETUP ............................................................................................................ 14
4.1
Operating Voltages ......................................................................................................... 14
4.2
LTCA-10/40 LCD Contrast Control .............................................................................. 14
4.3
LTCA-10/40 Printer Paper Control ................................................................................ 14
4.4
LTCA-10/40 Printer Paper ............................................................................................. 14
5.0
OPERATING PROCEDURES .......................................................................................... 15
5.1
Typical Connections to a Load Tap Changer (LTC) ...................................................... 15
5.2
LTCA-10 Cable Connections ......................................................................................... 15
5.3
LTCA-40 Cable Connections ......................................................................................... 16
5.4
General Procedures ........................................................................................................ 19
5.5
Performing a Resistance Test ......................................................................................... 20
5.5.1.
Resistance Test Result Printouts ............................................................................. 27
5.6
Performing a Special Resistance Test ............................................................................ 29
5.6.1.
Special Resistance Test Result Printout .................................................................. 34
5.7
Performing a Dynamic LTC Test ................................................................................... 35
5.7.1.
Dynamic LTC Test Result Printouts ....................................................................... 40
5.8
Diagnostic Mode ............................................................................................................ 42
5.9
Setup Menu .................................................................................................................... 44
5.9.1.
Entering the Transformer ID ................................................................................... 44
5.9.2.
Restoring a Test Record .......................................................................................... 47
5.9.3.
Printing the Test-Record Directory ......................................................................... 50
5.9.4.
Erasing a Test Record ............................................................................................. 52
5.9.5.
Enabling the Computer Interface ............................................................................ 54
5.9.6.
Setting the Date and Time ....................................................................................... 55
5.9.7.
Setting the Test Value Display Font ....................................................................... 56
6.0
LTCA-10/40 SPECIAL FEATURES ................................................................................ 57
6.1
Bypassing the Resistance Value Display Delay ............................................................. 57
6.2
Converting Resistance Measurements ........................................................................... 57