Simplify
User Interface
The EZCT-10 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, and a voltage control
knob is used to control the variable test voltage output. The test voltage range (50V at
10A, 200V at 10A, 1,200V at 1.5A) is selected with a switch on the control panel.
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
EZCT-10 TM
The EZCT-10 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
Current-Transformer Testing Made Easy data sets. Test records can be
recalled and printed on the
The EZCT-10 is a microprocessor-based, current-transformer test set. This built-in thermal printer.
rugged and portable test set can perform the current transformer (CT) excita-
tion, CT current-ratio, and winding polarity tests. Current transformers can be Computer Interface
tested in their field-mounted configuration, eliminating the need to remove The EZCT-10 can be used as a
bushings or current transformers from the host equipment. stand-alone unit or can be
computer-controlled via the
The EZCT-10 uses a heavy-duty transformer to perform the CT excitation test. It is built-in RS-232C or USB inter-
capable of outputting 50 Vac at 10A and 200 Vac at 10A. faces. Windows ® XP/Vista-
based Current Transformer
Excitation Test
Analysis software is provided
The CT excitation test is performed using the ANSI/IEEE C57.13.1, IEC 60044-1 test
with each EZCT-10. This soft-
method. The EZCT-10 applies an AC variable test voltage (up to 1,200 Vac) to the
ware can be used to retrieve
CT’s secondary windings. The EZCT-10 records and displays the test voltage and
test records from the EZCT-10
excitation current applied to the current transformer during the excitation test.
and can also be used to run CT
Once tests are completed, up to 10 excitation curves and knee-point voltages of the
tests from the PC. Tabulated
tests can be plotted on the built-in thermal printer. IEEE-30, IEEE-45, ANSI/IEC
test records can be exported
60044-1 (10/50) knee point voltages are also calculated and printed on the test
in Microsoft® Excel format.
report.
CT Ratio and Polarity Tests
The EZCT-10 determines the CT current-ratio using the ANSI/IEEE C57.12.90 meas-
urement method. A test voltage is applied on the CT’s X terminals and the induced Ordering Information EZCT-10TM Current-Transformer Test Set
voltage is measured across the CT’s H1 and H2 terminals. The current-ratio is dis- EZCT-10TM, Cable, Software Part No: EZCT-10
played on the screen and stored in memory. The current-ratio measuring range is EZCT-10TM Shipping Case Part No: EZCT-10 Case
from 0.8 to 5,000. Winding polarity is displayed as a “+” sign (in-phase) or “-” 4.5-inch Printer Paper Part No: Paper TP4
sign (out-of-phase) and is annotated with the phase angle in degrees.
Current-Transformer Test Set
the Tedious Procedure of Current-Transformer Testing
with Vanguard’s EZCT-10TM Current Transformer Test Set
Connector for Connector for Test Voltage Test Voltage Test Voltage RS-232C
▼ PC Printer Output X Terminals H Terminals Presence Indicator Selector Control Knob Interface
▼
Thermal Printer Output
4.5-inch Wide Rugged 16-Key Back-lit LCD Screen USB
Thermal Printer Membrane Keypad (20 characters by 4 lines) Interface
SPECIFICATIONS
TYPE Portable current-transformer test set
PHYSICAL SPECIFICATIONS 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)
INPUT POWER 100 – 120 Vac or 200 - 240 Vac (factory pre-set), 50/60 Hz
MEASUREMENT METHOD ANSI/IEEE C57.12.90, IEC 60044-1 and ANSI/IEEE C57.13.1
OUTPUT TEST VOLTAGES 0 – 50 Vac @ 10A max; 0 – 200 Vac @ 10A max; 0 – 1200 Vac @ 1.5A max (5 min on, 10 min off)
VOLTAGE READING RANGE 0 – 1,250 Vac; Accuracy: ±1.0% of reading, ±0.5 volt
CURRENT READING RANGE 0 – 10A; Accuracy: ±1.0% of reading, ±0.02A
CURRENT-RATIO RANGE 0.8 – 99: ±0.5%, 100 – 999: ±1.0%, 1,000 – 5,000: ±2%
PHASE ANGLE MEASUREMENT 0 – 360 degrees; Accuracy: ±1.0 degree
DISPLAY Back-lit LCD Screen (20 characters by 4 lines); viewable in bright sunlight and low-light levels
PRINTER Built-in 4.5-inch wide thermal printer
COMPUTER INTERFACES One RS-232C port, One USB port
PC SOFTWARE Windows® XP/Vista-based software is included with purchase price
INTERNAL TEST RECORD STORAGE Stores 128 test records. Each test record may contain up to 10 excitation and ratio data sets
INTERNAL TEST HEADER STORAGE Stores 10 test header records
SAFETY Designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 standards
ENVIRONMENT Operating: -10˚ to 50˚ C (15˚F to +122˚ F); Storage: -30˚ C to 70˚ C (-22˚F to +158˚ F)
HUMIDITY 90% RH @ 40˚C (104˚F) non-condensing
ALTITUDE 2,000m (6,562 ft) to full safety specifications
CABLES One 20-foot X cable set, One 35-foot H cable set, power cord, One cable carrying duffel bag
OPTIONS Transportation case
WARRANTY One year on parts and labor
Note: The above specifications are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifications are subject to change without notice.
Vanguard Instruments Company
Reliability Through Instrumentation
RVFeb10
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 analyz-
er, which was a resounding success. It became the forerunner of
an entire series of circuit-breaker test equipment. Since its begin-
ning, VIC’s product line has expanded to include microcomput-
er-based, precision micro-ohmmeters, single and three-phase
transformer winding turns-ratio testers, winding-resistance
meters, transformer tap-changing controllers, megaohm resist-
ance meters, and a variety of other electrical utility mainte-
nance support products.
VIC’s performance-oriented products are well suited for the util-
ity 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 procedur-
al 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
