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TM
EZCT
Current-Transformer Testing Made Easy
The EZCT is a microprocessor-based, current-transformer test set. This rugged
and portable test set can perform the current transformer (CT) excitation, CT
current-ratio, and winding polarity tests. Current transformers can be tested in
their field-mounted configuration, eliminating the need to remove bushings or
current transformers from the host equipment.
Excitation Test
The CT excitation test is performed using the ANSI/IEEE C57.13.1, IEC 60044-1 test
method. The EZCT applies an AC variable test voltage (up to 1,200 Vac) to the CT’s
secondary windings. The EZCT records and displays the test voltage and excitation
current applied to the current transformer during the excitation test. Once tests are
completed, up to 10 excitation curves and knee-point voltages of the tests can be
plotted on the built-in thermal printer. IEEE-30, IEEE-45, ANSI/IEC 60044-1
(10/50) knee point voltages are also calculated and printed on the test report.
CT Ratio and Polarity Tests
The EZCT determines the CT current-ratio using the ANSI/IEEE C57.12.90 measurement method. A test voltage is applied on the CT’s X terminals and the induced
voltage is measured across the CT’s H1 and H2 terminals. The current-ratio is displayed on the screen and stored in memory. The current-ratio measuring range is
from 0.8 to 5,000. Winding polarity is displayed as a “+” sign (in-phase) or “-”
sign (out-of-phase) and is annotated with the phase angle in degrees.
Simplif y
User Interface
The EZCT features a back-lit LCD screen (4 lines by 20 characters) that is viewable in both bright sunlight and low-light levels. A rugged, alpha-numeric,
membrane keypad is used to enter test information and to control the unit’s
functions. The test voltage range (50V at 2A, 200V at 2A, 1,200V at 1.5A) is
selected with a switch on the control panel. A voltage control knob is used to
control the variable test voltage output.
Thermal Printer
A built-in 4.5-inch wide thermal printer can print the current transformer test
report and plot the excitation curves.
Internal Test Record Storage Capacity
The EZCT can store up to 128
current-transformer test records
in Flash EEPROM. Each test
record may contain up to 10
excitation curves, polarity, and
current-ratio test data sets.
Test records can be recalled
and printed on the built-in
thermal printer.
Computer Interface
The EZCT can be used as a
stand-alone unit or can be
computer-controlled via the
built-in RS-232C or USB interfaces. Windows
based Current Transformer
Analysis software is provided
with each EZCT. This software
can be used to retrieve test
records from the EZCT and
can also be used to run CT
tests from the PC. Tabulated
test records can be exported in
Microsoft
Ordering Information EZCT
EZCT
EZCTTMShipping Case Part No: EZCT Case
4.5-inch Printer Paper Part No: Paper TP4
®
XP/Vista-
®
Excel format.
TM
TM
, Cable, Software Part No: EZCT
Current-Transformer Test Set
Current-Transformer Test Set
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the Tedious Procedure of Current-TransformerTesting
TM
with Vanguard’s EZCT
Current Transformer Test Set
▼
PC Printer Output
▼
Thermal Printer Output
onnector for
C
X Terminals
Connector for
Terminals
H
4.5-inch Wide
Thermal Printer
Test Voltage
Presence Indicator
ugged 16-Key
R
Membrane Keypad
Test Voltage
elector
S
Back-lit LCD Screen
20 characters by 4 lines)
(
Test Voltage
ontrol Knob
C
RS-232C
I
SB
U
Interface
nterface
SPECIFICATIONS
Portable current-transformer test set
TYPE
PHYSICAL SPECIFICATIONS
INPUT POWER
MEASUREMENT METHOD
OUTPUT TEST VOLTAGES
VOLTAGE READING RANGE
CURRENT READING RANGE
CURRENT-RATIO RANGE
PHASE ANGLE MEASUREMENT
DISPLAY
PRINTER
COMPUTER INTERFACES
PC SOFTWARE
INTERNAL TEST RECORD STORAGE
INTERNAL TEST HEADER STORAGE
SAFETY
ENVIRONMENT
HUMIDITY
ALTITUDE
CABLES
OPTIONS
WARRANTY
Note: The above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice.
16.8”W x 12.6”H x 12”D (42.7 cm x 32 cm x 26.9 cm); Weight: 55 lbs (25 Kg)
100 – 120 Vac or 200 – 240 Vac (factory pre-set), 50/60 Hz
ANSI/IEEE C57.12.90, IEC 60044-1 and ANSI/IEEE C57.13.1
0 – 50 Vac @ 2A max; 0 – 200 Vac @ 2A max; 0 – 1200 Vac @ 1.5A max (5 min on, 10 min off)
0 – 1,250 Vac; Accuracy: ±1.0% of reading, ±0.5 volt
0 – 10A; Accuracy: ±1.0% of reading, ±0.01A
0.8 – 99: ±0.5%, 100 – 999: ±1.0%, 1,000 – 5,000: ±2%
0 – 360 degrees; Accuracy: ±1.0 degree
Back-lit LCD Screen (20 characters by 4 lines); viewable in bright sunlight and low-light levels
Built-in 4.5-inch wide thermal printer
One RS-232C port, One USB port
Windows® XP/Vista-based software is included with purchase price
Stores 128 test records. Each test record may contain up to 10 excitation and ratio data sets
Stores 10 test header records
Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 standards
Operating: -10˚ to 50˚ C (15˚F to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚F to +158˚ F)
90% RH @ 40˚C (104˚F) non-condensing
2,000m (6,562 ft) to full safety specifications
One 20-foot X cable set, One 35-foot H cable set, power cord, One cable carrying duffel bag
Transportation case
One year on parts and labor
Vanguard Instruments Company
Reliability Through Instrumentation
RVFeb10
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Vanguard Instruments Company, Inc.
Vanguard Instruments Co., (VIC), was founded in 1991.
Currently, our 28,000 square-foot facility houses Administration,
Design & Engineering, and Manufacturing operations. From its
inception, VIC’s vision was, and is to develop and manufacture
innovative test equipment for use in testing substation EHV circuit
breakers and other electrical apparatus.
The first VIC product was a computerized circuit-breaker analyzer, which was a resounding success. It became the forerunner of
an entire series of circuit-breaker test equipment. Since its beginning, VIC’s product line has expanded to include microcomputer-based, precision micro-ohmmeters, single and three-phase
transformer winding turns-ratio testers, winding-resistance
meters, transformer tap-changing controllers, megaohm resistance meters, and a variety of other electrical utility maintenance support products.
VIC’s performance-oriented products are well suited for the utility industry. They are rugged, reliable, accurate, user friendly, and
most are computer controlled. Computer control, with innovative
programming, provides many automated testing functions. VIC’s
instruments eliminate tedious and time-consuming operations,
while providing fast, complex, test-result calculations. Errors are
reduced and the need to memorize long sequences of procedural steps is eliminated. Every VIC instrument is competitively
priced and is covered by a liberal warranty.
Vanguard products are available from:
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave. • Ontario, California 91761 USA • P 909-923-9390 • F 909-923-9391
www.vanguard-instruments.com
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