Vanguard Instruments EZCT Manual

OPERATING PROCEDURES
for the
EZCT and EZCT-10
Digital Current Transformer Tester
Vanguard Instruments Co., Inc.
1520 S. Hellman Ave.
Ontario, California 91761
TEL: [phone] July 2005
FAX: [phone] REV. 2

Operating Procedures EZCT and EZCT-10
SAFETY SUMMARY
This manual applies to Model EZCT  and EZCT-10  . The operating procedures are
virtually the same for all models, any differences in operation are clearly described in the step-
by-step procedures.
Follow Exact Operating Procedures
Any deviation from the procedures described in this operator’s manual may create one or more
safety hazards, damage the EZCT, or cause errors in the test results; Vanguard Instruments Co.,
Inc. assumes no liability for unsafe or improper use of the EZCT.
The following safety precautions must be observed during all phases of test set-up, test hookups,
testing, and test-lead disconnects.
SAFETY WARNINGS AND CAUTIONS
This device shall be used only by trained operators.
All Current Transformers under test shall be off line and fully isolated.
Always ground the EZCTand EZCT-10to a substation ground
before connecting the test cables to a transformer.
Precaution with High Test Voltage
Because the EZCT can produce a voltage up to 1,200Vac, this high voltage can cause severe
injury, death, and/or equipment damage. The device shall be used only by trained operators.
Do Not Test Current Transformers in Circuit
Never attempt to test any Current Transformer still connected to a circuit. All Current
Transformer terminals shall be isolated before conducting any test with the EZCT.
Do Not Modify Test Equipment
Because of the risk of introducing unknown hazards, do not install substitute parts or perform
any unauthorized modification to any Model EZCT Test unit. To ensure that all designed safety
features are maintained, it is recommended that repairs be performed only by Vanguard
Instruments Co. factory personnel or by an authorized repair service. Unauthorized
modifications can cause serious safety hazards and will nullify the manufacturer's warranty.

Operating Procedures EZCT and EZCT-10
1
TABLE OF CONTENTS
Safety Summary
1.0 INTRODUCTION.................................................................................................................... 3
1.1 Applicability.......................................................................................................................... 3
1.2.General Description .............................................................................................................. 3
1.3 Functional Description.......................................................................................................... 3
1.4 Furnished Test Accessories................................................................................................... 4
2.0 EZCTand EZCT-10Specifications................................................................................... 5
3.0 CONTROLS AND INDICATORS.......................................................................................... 7
3.1 EZCT Controls & Indicators................................................................................................. 7
3.2 EZCT-10 Controls & Indicators ........................................................................................... 9
4.0 PRETEST SETUP ................................................................................................................. 11
4.1 Operating Voltages ............................................................................................................. 11
4.2 EZCT LCD Contrast Control.............................................................................................. 11
4.3 EZCT Printer Control ......................................................................................................... 11
4.4 RS-232C Computer-Interface port...................................................................................... 11
4.5 EZCT Printer Paper............................................................................................................. 11
5.0 EZCT CABLE CONNECTIONS .......................................................................................... 12
6.0 OPERATING PROCEDURES.............................................................................................. 15
6.1 Run Test Procedure............................................................................................................. 15
6.1.1 Run Excitation and Ratio test .......................................................................................... 15
6.1.2 Run Ratio Only Test ........................................................................................................ 21
6.2 EZCT Test Record ID......................................................................................................... 24
6.2.1 Enter Test Record ID Procedure...................................................................................... 24
6.2.2 EZCT Test (Shot) Record ID Directory........................................................................... 26
6.2.3 Load Test Record ID Procedure....................................................................................... 28
6.3 Restore Record Procedure................................................................................................... 29
6.4 Print Record Procedure....................................................................................................... 30
6.5 Print Test Record Directory Procedure.............................................................................. 33
6.6 Erase Test Record Procedure.............................................................................................. 35
6.7 Computer Interface Procedure ............................................................................................ 36
6.8 Set EZCT Real Time Clock Procedures ............................................................................. 37
6.9 Set Knee Point Marker........................................................................................................ 38
6.10 Print (Z) Impedance In The Tabulated Results................................................................. 39
6.11 Diagnostic......................................................................................................................... 41
Appendix A EZCTTroubleshooting Guide

Operating Procedures EZCT and EZCT-10
2
LIST OF TABLES
Table 1 EZCTSpecifications...................................................................................................... 5
Table 2 EZCT-10Specifications ................................................................................................ 6
Table 3 EZCTControls and Indicators ...................................................................................... 8
Table 4 EZCTControls and Indicators .................................................................................... 10
Table 5 Run Excitation and Ratio Test........................................................................................ 15
Table 5 Run Excitation and Ratio Test (continued)..................................................................... 16
Table 5 Run Excitation and Ratio Test (continued)..................................................................... 17
Table 6 Run Ratio Only Test ....................................................................................................... 21
Table 6 Run Ratio Only Test (continued).................................................................................... 22
Table 7 Enter Test Record ID Procedure..................................................................................... 24
Table 7 Enter Test Record ID Procedure (continued).................................................................. 25
Table 8 Print Test Record ID Directory Procedure...................................................................... 26
Table 9 Load Test Record ID Directory Procedure ..................................................................... 28
Table 10 Review Record Procedure............................................................................................. 29
Table 10 Review Record Procedure (continued)......................................................................... 30
Table 11 Print Record Procedures ............................................................................................... 30
Table 12 Print Test Record Directory.......................................................................................... 33
Table 13 Erase Test Record Procedure........................................................................................ 35
Table 14 Computer Interface Procedures..................................................................................... 36
Table 15 Set Clock Procedures.................................................................................................... 37
Table 16 Set Knee Point Marker Procedures............................................................................... 38
Table 17 Print Impedance Procedures.......................................................................................... 39
Table 18 EZCT Diagnostic Procedures ....................................................................................... 41
LIST OF FIGURES
Figure 1 EZCTControl Panel (Controls and Indicators) ........................................................... 7
Figure 2 EZCT-10Control Panel (Controls and Indicators)...................................................... 9
Figure 3 Typical EZCT Cable Connection .................................................................................. 12
Figure 4 Connection to CTs on Wye Transformer....................................................................... 13
Figure 5 Connection to CTs on a Delta Transformer................................................................... 13
Figure 6 Typical EZCT Connection to Multiple CTs.................................................................. 14
Figure 7 Typical EZCTTabulated Report Printout.................................................................. 19
Figure 8 Typical EZCTExcitation Graph................................................................................. 20
Figure 9 Ratio Only Test Report Printout.................................................................................... 23
Figure 10 Test Record ID Directory Printout............................................................................... 27
Figure 11 Typical EZCT “Abbreviated” Tabulated Results Print Out........................................ 31
Figure 12 Typical Graphic Results Print Out With Multiple Excitation Curves......................... 32
Figure 13 Typical Test Record Directory Printout....................................................................... 34
Figure 14 Tabulated Report with Impedance Print Out............................................................... 40

Operating Procedures EZCT and EZCT-10
3
1.0 INTRODUCTION
1.1 Applicability
This manual applies to the Model EZCT™ and Model EZCT-10™ (hereafter, EZCT), made by
Vanguard Instruments Company, Inc.
1.2.General Description
The EZCT is a microprocessor based current transformer (CT) test set. This rugged yet portable
test set measures CT excitation voltage and current, turns ratio, and winding polarity on single or
multi-ratio current transformers.
The EZCT provides a variable AC test voltage up to 1,200Vac for the CT excitation test. Test
voltage and excitation current readings are displayed on the LCD and recorded during a test.
Once the test is completed, users can print the CT excitation curves and test data and/or save the
test results in FLASH EEPROM.
The CT turns ratio is determined by dividing the measured excitation voltage applied to the CT
secondary winding by the induced voltage measured on the CT primary winding.
The EZCT has a 16-key pushbutton pad for entering test parameters and control functions. Test
voltage is raised or lowered by a Voltage Control knob. A 4-line by 20-character LCD readout is
used for displaying control-option menus and test data. The EZCT has a built-in thermal printer,
for printing test data on 4.5-inch-wide thermal sensitive paper.
The EZCT can be used in the stand-alone-mode or in the computer-control mode. In stand-alone
mode, all tests are conducted from the EZCT front panel. Operation only requires connecting the
test leads to the current transformer primary and secondary windings and following the test
sequence displayed on the LCD. Knee point voltages (IEEE 45, IEEE 30, ANSI 10/50) are
calculated automatically by the EZCT. Current transformer excitation curves, knee point
voltages, and turns ratio can be printed on the thermal printer.
Up to 10 tests can be stored in one record. A test contains excitation curve data (typically, 32 data
points per curve), knee point voltages, and turns ratio reading. Up to 128 records can be stored in
FLASH EEPROM memory. Operators can recall the stored test records at a later time for review
and printing.
The Computer Interface mode allows the user to run excitation and ratio tests from the PC or to
retrieve test records stored in the EZCT to the PC’s memory.
A RS232 serial cable, and a Windows-Based PC Current Transformer Analysis Software (on
CD) is supplied with each EZCT.
This manual will focus on the stand-alone mode for the EZCT.
1.3 Functional Description
The EZCT performs the current transformer excitation test following the ANSI/IEEE C57.13.1-
1981 (IEEE Guide for Testing of Relaying Field Current Transformers). To find the current
transformer excitation curve, the EZCT applies an AC test voltage to the secondary winding of
the current transformer. The test voltage is first raised until the current transformer achieves
saturation. The test voltage is then slowly lowered to zero volts. Test voltage and current
readings are recorded until the test voltage reaches zero volts.
Knee point voltages (IEEE-30, IEEE-45, ANSI-10/50) are calculated automatically by the EZCT.

Operating Procedures EZCT and EZCT-10
4
The current transformer turns ratio is measured using the voltage method (ANSI/IEEE
C57.12.90). The transformer turns ratio percentage error can also be calculated if required. The
EZCT can measure turns ratios from 0.8 to 5,000.00 to one.
Three test voltage ranges (50Vac, 200Vac, 1,200Vac) are available for the excitation test.
Both the EZCT and EZCT-10 have the same functional features. The only difference is that the
EZCT-10 has more output current on the 50Vac and the 200Vac test voltages.
The EZCT test voltage and current output ranges are: 50Vac @ 2A, 200Vac @ 2A, 1200Vac @
1.2A
The EZCT-10 test voltage and current output ranges are: 50Vac @ 10A, 200Vac @ 10A,
1200Vac @ 1.2A
WARNING
Never change the test voltage range during a test. Failure to observe this warning may damage
the EZCT.
1.4 Furnished Test Accessories
The EZCT is supplied with a power cord, a roll of 4.5-inch-wide thermal printer paper, one 35-
foot H test cable, one 20 foot X cable, one ground cable, a duffel bag and a shipping case.

Operating Procedures EZCT and EZCT-10
5
2.0 EZCTAND EZCT-10SPECIFICATIONS
Table 1 EZCTSpecifications
MODEL................................................... EZCT
TYPE ...................................................... Special-purpose test equipment, Current Transformer tester
POWER .................................................. 85 to 132Vac or 200-240Vac (factory preset), 50/60 Hz
SIZE (inches).......................................... 16.8 wide by 12.6 high by 10.6 deep
WEIGHT ................................................. Less than 35 lbs
TEST VOLTAGE .................................... 0 to 50Vac @ 2A max.
0 to 200Vac @ 2A max.
0 to 1,200Vac @ 1.2 max (5 min on, 10 min off)
VOLTAGE READING RANGE............... 0 TO 1,250Vac, Accuracy: 1.0% of reading, 0.5 volt
CURRENT READING RANGE............... 0 to 2 A, Accuracy: 1% of reading, 0.02A
TURN RATIO RANGE............................ 0.8 to 99; Accuracy: 0.5%
100 to 999; Accuracy: 1.0%
1000 to 5000; Accuracy: 2.0%
PHASE ANGLE MEASUREMENT......... 0 to 360 degrees, Accuracy: 1.0 degree
DISPLAY ................................................ Backlit LCD, 4 lines by 20 characters
CONTROLS............................................ Keypad: 10 alpha-numeric keys and 6 function keys
PRINTER................................................ Thermal printer (prints on 4.5-inch-wide thermal paper)
COMPUTER INTERFACE...................... RS-232C; 19,200 Baud
PC SOFTWARE ..................................... Windows XP-based CT Analysis Program with each unit
TEST STORAGE.................................... 128 records (of 10 curves)
ENVIRONMENT ..................................... Operating: 0C to 55C; Storage: -40C to 65C
FURNISHED........................................... One power cord, One 35-ft H test cable, One 20-ft X test
Cable, One ground cable, One cable bag, One carrying case
EXPENDABLES..................................... Paper, thermally sensitive, 4.5-inch wide roll
(VIC part # TP-4)
WARRANTY........................................... One-year warranty on parts and labor; post warranty service
contracts available
NOTE:
▪THE ABOVE SPECIFICATIONS ARE VALID AT NOMINAL OPERATING VOLTAGE AND AT A TEMPERATURE OF 25  C (77  F)
▪EZCT  SPECIFICATIONS MAY BE UPGRADED AND CHANGED WITHOUT PRIOR NOTICE.

Operating Procedures EZCT and EZCT-10
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Table 2 EZCT-10Specifications
MODEL................................................... EZCT-10
TYPE ...................................................... Special-purpose test equipment, Current Transformer
tester
POWER .................................................. 85 to 132Vac or 200-240Vac (factory preset), 50/60 Hz
SIZE (inches).......................................... 16.8 wide by 12.6 high by 10.6 deep
WEIGHT ................................................. Less than 35 lbs
TEST VOLTAGE .................................... 0 to 50Vac @ 10A max.
0 to 200Vac @ 10A max.
0 to 1,200Vac @ 1.2A max (5 min on, 10 min off)
VOLTAGE READING RANGE............... 0 TO 1,250Vac, Accuracy: 1.0% of reading, 0.5 volt
CURRENT READING RANGE............... 0 to 2 A, Accuracy: 1.0% of reading, 0.02A
TURN RATIO RANGE............................ 0.8 to 99; Accuracy: 0.5%
100 to 999; Accuracy: 1.0%
1000 to 5000; Accuracy: 2.0%
PHASE ANGLE MEASUREMENT......... 0 to 360 degrees, Accuracy: 1.0 degree
DISPLAY ................................................ Back-lit LCD, 4 lines by 20 characters
CONTROLS............................................ Keypad: 10 alpha-numeric keys and 6 function keys
PRINTER................................................ Thermal printer (prints on 4.5-inch-wide thermal paper)
COMPUTER INTERFACE...................... RS-232C; 19,200 Baud
PC SOFTWARE ..................................... Windows XP-based CT Analysis Program with each unit
TEST STORAGE.................................... 128 records (of 10 curves)
ENVIRONMENT ..................................... Operating: 0C to 55C; Storage: -40C to 65C
FURNISHED........................................... One power cord, One 35-ft H test cable, One 20-ft X test
Cable, One ground cable, One cable bag, One carrying case.
EXPENDABLES..................................... Paper, thermally sensitive, 4.5-inch wide roll
(VIC part # TP-4)
WARRANTY........................................... One-year warranty on parts and labor; post warranty service
contracts available
NOTE:
▪THE ABOVE SPECIFICATIONS ARE VALID AT NOMINAL OPERATING VOLTAGE AND AT A TEMPERATURE OF 25  C (77  F)
▪EZCT-10  SPECIFICATIONS MAY BE UPGRADED AND CHANGED WITHOUT PRIOR NOTICE.

Operating Procedures EZCT and EZCT-10
7
3.0 CONTROLS AND INDICATORS
3.1 EZCT Controls & Indicators
(See Figure 1 and refer to Table 3.0).
The EZCT controls and indicators are shown in a panel illustration (see Figure 1). Pointing
leader lines reference each item in the figure with an index number. Each index number is cross-
referenced to a functional description in Table 3.0, which describes the purpose of each item on
the control panel. Although the purpose of these controls and the display may seem obvious,
users should become familiar with them before attempting to use the EZCT. Accidental misuse
of the controls will usually cause no serious loss of data or equipment damage. First-time users
should review and become familiar with the Safety Summary located in the front section of this
manual.
Figure 1 EZCTControl Panel (Controls and Indicators)

Operating Procedures EZCT and EZCT-10
8
Table 3 EZCTControls and Indicators
Fig. 1
Index PANEL MARKING FUNCTIONAL DESCRIPTION
1X1 X2 Current transformer excitation voltage. Each set
of connectors contains a test voltage output
connector and sense lead connector.
2(no marking) H cable shield connector (1).
3H1 H2 Current transformer primary input connectors (2).
450V
200V
1200V
Test voltage range selector switch.
5HIGH VOLTAGE
PRESENT Warning indicator; red LED; Lights when test
voltage is present at the test terminals (X1 & X2).
6120/240 Vac, 8A, 50-60Hz
I/O Input power connector with third wire safety
ground and 20A built-in circuit breaker.
7(no marking) AC receptacle.
8GROUND Ground Stud
9RS-232C Connector, 9-pin; Serial interface-port connector
(female DB type) to allow the EZCTto be
controlled by an IBM-compatible PC.
PIN SIGNAL
2 Tx
3 Rx
5 Signal Gnd
10 VOLTAGE
CONTROL Test voltage control knob
11 (no marking) Operating key-pad controls; 10 alpha-numeric
keys and 6 function keys (i.e., START, STOP,
CLEAR, ENTER, & CONTRAST/PAPER
positioning &).
12 (no marking) Display, back-lighted liquid crystal (LCD); 4-line
by 20-character; sunlight readable; displays test
menus (operator options), status, and test results
13 (no marking) Built-in thermal printer; prints test result data on
4.5-inch-wide thermal paper.

Operating Procedures EZCT and EZCT-10
9
3.2 EZCT-10 Controls & Indicators
(See Figure 2 and refer to Table 4.0).
The EZCT-10 controls and indicators are shown in a panel illustration (see Figure 2). Pointing
leader lines reference each item in the figure with an index number. Each index number is cross-
referenced to a functional description in Table 4.0, which describes the purpose of each item on
the control panel. Although the purpose of these controls and the display may seem obvious,
users should become familiar with them before attempting to use the EZCT-10. Accidental
misuse of the controls will usually cause no serious loss of data or equipment damage. First-time
users should review and become familiar with the Safety Summary located in the front section of
this manual.
Figure 2 EZCT-10Control Panel (Controls and Indicators)

Operating Procedures EZCT and EZCT-10
10
Table 4 EZCTControls and Indicators
Fig. 2
Index PANEL MARKING FUNCTIONAL DESCRIPTION
1X1 X2 Current transformer excitation voltage. Each set
of connectors contains a test voltage output
connector and sense lead connector.
2(no marking) H cable shield connector (1).
3H1 H2 Current transformer primary input connectors (2).
450V
200V
1200V
Test voltage range selector switch.
5HIGH VOLTAGE
PRESENT Warning indicator; red LED; Lights when test
voltage is present at the test terminals (X1 & X2).
6120/240 Vac, 8A, 50-60Hz
I/O Input power connector with third wire safety
ground and 20A built-in circuit breaker.
7(no marking) AC receptacle.
8GROUND Ground Stud
9RS-232C Connector, 9-pin; Serial interface-port connector
(female DB type) to allow the EZCTto be
controlled by an IBM-compatible PC.
PIN SIGNAL
2 Tx
3 Rx
5 Signal Gnd
10 VOLTAGE
CONTROL Test voltage control knob
11 (no marking) Operating key-pad controls; 10 alpha-numeric
keys and 6 function keys (i.e., START, STOP,
CLEAR, ENTER, & CONTRAST/PAPER
positioning &).
12 (no marking) Display, back-lighted liquid crystal (LCD); 4-line
by 20-character; sunlight readable; displays test
menus (operator options), status, and test results
13 (no marking) Built-in thermal printer; prints test result data on
4.5-inch-wide thermal paper.

Operating Procedures EZCT and EZCT-10
11
4.0 PRETEST SETUP
4.1 Operating Voltages
The EZCToperating voltages are pre-set for 90-130Vac, 50/60Hz or 210-240Vac, 50/60Hz. at
the factory.
4.2 EZCT LCD Contrast Control
The EZCT uses a 4 lines by 16 characters back-lighted LCD. To Darken the LCD display, press
and hold the “Paper  Contrast” switch for two seconds and the LCD will begin to darken. To
lighten the LCD display, press and hold the “Paper  Contrast” switch for two seconds and the
LCD will begin to lighten.
4.3 EZCT Printer Control
To advance printer paper, press “Paper  Contrast” switch once. Paper will advance from printer.
Press “Paper  Contrast” switch once, paper will move backward into printer.
4.4 RS-232C Computer-Interface port
An IBM PC software package supplied with each EZCT allows the user to retrieve test records
stored in the EZCT memory or control the EZCT from the PC.
4.5 EZCT Printer Paper
The EZCTprinter uses 4.5-inch wide thermal paper for printing test results. We recommend
that to maintain the highest quality printing and to avoid paper jamming, use paper supplied by
our factory. Paper can be ordered from two sources, as follows:
Vanguard Instruments Co, Inc.
1520 S. Hellman Ave
Ontario, CA 91761
Tel: [phone]
Fax: [phone]
Part Number: TP-4 Paper
Or
BG Instrument Co.
12607 E. Trent Avenue
Spokane, WA 99216
Tel: [phone]
Fax: [phone]
Part Number: TP-4 paper

Operating Procedures EZCT and EZCT-10
12
5.0 EZCT CABLE CONNECTIONS
Always connect the EZCT to the substation ground before connecting any test cables.
The EZCT is supplied with a 20-foot X test cable and a 35-foot H cable. Only the X cable
connection is required to run the current transformer excitation test. The H and X cable
connection is required to run the transformer ratio test. A typical connection is shown in figure 3.
Figure 3 Typical EZCT Cable Connection

Operating Procedures EZCT and EZCT-10
13
Figure 4 Connection to CTs on Wye Transformer
Figure 5 Connection to CTs on a Delta Transformer

Operating Procedures EZCT and EZCT-10
14
Figure 6 Typical EZCT Connection to Multiple CTs

Operating Procedures EZCT and EZCT-10
15
6.0 OPERATING PROCEDURES
(Refer to tables 5 through 18) WARNING
Do not change the voltage selector switch during a test. Failure to observe this may result in
the EZCT tripping the circuit breaker.
6.1 Run Test Procedure
The following test procedure describes the steps required for a CT Excitation and Turns Ratio
Test or a Turns Ratio Test only.
6.1.1 Run Excitation and Ratio test
When a user runs an excitation test, the EZCT applies an AC voltage to the CT secondary
winding. The user raises this AC voltage until the CT windings reach the saturation point. The
user then slowly lowers the test voltage back to zero volts. The voltage and current readings will
be recorded to plot the excitation curve. A typical excitation test contains a maximum of 32 data
points. There may be less than 32 data points depending on how quickly the voltage is lowered to
zero or because of the CT excitation curve characteristics.
The Knee point voltages (using IEEE 45, IEEE 30, ANSI 10/50 standards) are calculated and
printed on the tabulated report.
The CT turns ratio is measured using the voltage method. An AC voltage is applied to the CT
secondary winding. The induced voltage on the CT primary winding is then measured. The CT
turns ratio is the voltage ratio measured between the secondary and the primary windings.
The following procedure describes the steps to run a CT excitation and ratio test.
NOTE
The red HIGH VOLTAGE PRESENT indicator is on when a test voltage is present at the X
terminals.
Table 5 Run Excitation and Ratio Test
STEP ACTION DISPLAY
5-1 None. EZCT Main menu.
5-2 Begin RUN TEST procedure: Press key # 1
(RUN TEST) on MAIN MENU. The “Test
Selection” menu appears.
5-3 Select Excitation & Ratio test by pressing
key # 1. The “SET VOLTAGE RANGE”
menu appears. SET VTG RNG SELECTOR
“START” TO BEGIN
1.EXCITATION & RATIO
2.RATIO ONLY
1.RUN TEST 07/06/06
2.SETUP 16:22:01
3.DIAGNOSTIC

Operating Procedures EZCT™ and EZCT-10
16
Table 5 Run Excitation and Ratio Test (continued)
STEP ACTION DISPLAY
5-4 Select a test voltage range (50V, 200V,
1200V) with the test voltage range selector
switch. Press the “START” key to begin
the excitation test.
5-5 Turn the voltage knob until the test current
displayed is about 2.0A.
Press “ENTER” to confirm that the CT has
been saturated.
5-6 Slowly turn the voltage knob to zero.
5-7 When the excitation voltage reaches zero,
the “RUN RATIO TEST” menu will
appear.
5-8 Run the transformer ratio test by pressing key
#1 (YES).
5-9 To have the EZCT calculate the percentage
error, enter the transformer nameplate ratio
by pressing key #1 (YES).
5-10 Enter the transformer nameplate ratio.
NOTE
Enter the “high side” number then press the
“ENTER” key to enter the “low side”
number. Press the “ENTER” key again to
confirm.
XFMR NAME PLATE RAT.
1.YES
2.NO
ENTER PLATE RATIO
0 :
ENTER PLATE RATIO
2200 : 5.0
RUN RATIO TEST?
1.YES
2.NO
SET EXCITATION POINT
“ENTER” TO CONTINUE
I = 2.1005 AMPS
V = 360.0 VAC
S-L-O-W-L-Y
LOWER CURRENT NOW…
I = 0.020 AMPS
V = 0.3 VAC
TURN VTG UP UNTIL CT
SATURATES (2.0A MAX)