2293
Winding resistance meter with one-time-connection system
The Tettex 2293 is the result of extensive research and
years of experience testing transformers. It incorporates
a fast and highly advanced procedure to measure
winding resistance. A simple one-time-connection
system together with the simultaneous winding
magnetization method drastically reduces measuring
time.
The simultaneous winding magnetization (SWM)
method guarantees fast and reliable measurements
even on large power transformers with delta windings
on the low voltage side, where stable measurements
can be seldom reached using traditional winding
resistance measurement instruments.
In addition, the new demagnetization function
eliminates the magnetic remanence in the core after the
application of a DC voltage. This feature can be used
before performing other tests such as frequency
response analysis (FRA), transformer turns ratio
measurement (TTR) or recovery voltage measurement
(RVM) which are adversely affected by remanence
effects.
The transformer is discharged by a state-of-the-art
discharge circuit in a fraction of the time taken by other
instruments. The discharging function and the
“Caution” indicator continue to operate even when line
power is lost.
FEATURES AND BENEFITS
Resistance measurement made easy – simple one-time-
connection system: Once connected will test all phases
and windings
Large 7” touch screen interface with full graphical test
visualization
Unique simultaneous winding magnetization method
(SWM), equivalent to traditional equipment with up to
100 A test current
Tap changer control signal
Heat run function and 6 temperature measurement
channels with automatic resistance value correction
Data transfer over USB memory-stick or direct to PC
APPLICATIONS
Resistance measurement and demagnetization function for
all types of highly inductive test objects.
Power transformers
Distribution transformers
Generators and motors
Instrument transformers
The 2293 is a valuable tool for factory test, acceptance test
and regular maintenance.
A test solution optimized for easy and fast
winding resistance measurement on power and
distribution transformers as well as motors and
generators.
a brand of
Haefely has a policy of continuous product improvement. Therefore we reserve the right t o change design and specification without notice. LL_2293_0311_SG - 1/4
Haefely is a subsidiary
of Hubbell Incorporated.
COMPLETE AUTOMATIC TEST PROCEDURE
The 2293 performs resistance measurements on all
windings without any reconnection. The test procedure is
simple and efficient. One end of the measurement cable set
is connected to each bushing of the transformer using the
special Kelvin clamp, while the other end is connected to
the 2293.
Once the cable set is connected to the test object, the
instrument will automatically measure selected resistances
of both windings and all phases. In addition, the motorized
tap changer can be controlled to perform fully automated
measurements on all taps. A complete transformer can be
tested by a single person in a fraction of the time compared
to traditional instruments.
GRAPHICAL INTERFACE
The 7” touch screen full graphical interface guides the
operator through the test procedure.
Select the test object by touching the appropriate icon and
press start – The unit then visualizes each test cycle and
displays the results graphically or in list format.
DEMAGNETIZATION FUNCTION
Applying a DC current to an inductive test object, like a
power transformer, magnetizes the core. The resulting
magnetic remanence will have an adverse effect on other
measurements.
The 2293 includes a fully automatic demagnetization
feature which eliminates the magnetic remanence. Select
the test object by touching the appropriate icon and press
start – The unit visualizes the whole demagnetization cycle
and performs the correct core demagnetization.
HEAT RUN TEST
The 2293, which can measure HV and LV side resistances
simultaneously and accurately, is the perfect tool for
resistance measurements during a heat run test.
The instrument provides efficient and accurate acquisition
of the required data points to allow drawing
the necessary cooling curve.
Results are available as CSV and can be easily exported.
DATA HANDLING AND TEST REPORTS
The 2293 allows easy data handling. Results can be saved
on a USB memory stick or transferred to any computer. In
addition the instrument can be connected via Ethernet to a
LAN. It also includes a thermal printer for immediate report
Select
Start
a brand of
Haefely has a policy of continuous product improvement. Therefore we reserve the right t o change design and specification without notice. LL_2293_0311_SG - 2/4
Results
printing.
Results can also be saved in the instrument’s memory
while continuing testing, to be downloaded later after
having returned to the office.
Haefely is a subsidiary
of Hubbell Incorporated.
TECHNICAL SPECIFICATIONS
Resistance Measurement
Max. Measuring Current 32 A (user selectable)
Max. Charging Voltage 100 V
Range 0.1 μΩ … 300 kΩ
Resistance Accuracy
(1)
0.1 μΩ ... 300 μΩ 0.1% ± 0.5 μΩ
300.1 μΩ … 30 kΩ 0.1%
30.01 kΩ … 300 kΩ 1%
Mains Power Supply
Voltage 90 VAC … 264 VAC
Maximum Power 1 kW
Frequency 47 Hz … 63 Hz
Environmental
Operating temperature -10°C … +60°C
Storage temperature -20°C ... +70°C
Humidity 5% … 90% r.h. non-condensing
Mechanical
Dimensions (W x D x H) 521 mm x 425 mm x 216 mm
(2)
Weight
(2)
17.8 kg
Measuring cables not included
(1)
at temperature 0 … 50°C at highest available current
Functions
- 8 measuring channels (2 x 3 phases and 2 x 1 neutral)
- 6 temperature channels with automatic resistance correction
- Advanced 7” graphical touch screen interface
- High efficient DC supply with SWM (simultaneous winding magnetization)
- SWM mode and Classic mode (for traditional resistance measurement method)
- Turbo discharge circuit
- Automated demagnetizing function with flux indicator
- Automatic heat run function
- Tap changer control signal to automate test procedures on transformers with motorized tap changer
- Internal memory >10'000 measurements
- USB and LAN connections. Data can be saved on a memory stick or directly transferred to PC
- Charges any inductive load and works with any resistive or inductive test object
- Heavy duty protection circuit
- Safety circuit ensures discharge even when line power is lost
- Caution indicator
- Built-in printer
SCOPE OF SUPPLY
Measuring unit, cable set (10 m), carrying bag, test certificate, user manual
Options
2293/TEMP1 Temperature probe for liquids
2293/TEMP2 Magnetic temperature probe for metallic test objects
2293/TAP Tap changer connection cable
2293/10 10 m extension cables
a brand of
Haefely has a policy of continuous product improvement. Therefore we reserve the right t o change design and specification without notice. LL_2293_0311_SG - 3/4
Haefely is a subsidiary
of Hubbell Incorporated.
Tettex Instruments offers a complete portfolio for transformer testing
Transformer Turns Ratio Meter
Onsite testing of turns and
voltage ratio, phase displacement
and excitation current. Automatic
winding connection identification
and vector group detection.
Remotely controllable via USB.
Mobile system for nondestructive diagnosis of the state
of paper-oil insulation (effect of
moisture content and aging)
using the recovery voltage
method.
Fully automated digital liquid
electrical test set designed to
reliably and accurately test the
dielectric strength of insulation
liquids.
TTR 2795 / TTR 2796
with 100/250 V test voltage
RVM 5462
Recovery Voltage Meter
OC60E
Oil Cell Tester
FRA 5310
Frequency Response Analyser
Detection of winding movements
and mechanical failures of
transformers. Active probing
assures reliable and repetitive
measurement results. Advanced
analysis and touch screen
operation.
MIDAS 2880
Mobile Insulation Diagnosis
& Analysing System
The ideal tool for periodic
maintenance and inspection of
high voltage insulation losses,
dissipation factor (tan δ), power
factor and capacitance of power
transformers, bushings, motors,
generators etc.
www.tettex.com
Europe, Asia, South & Central
America, Australia
Haefely Test AG
Lehenmattstrasse 353
4052 Basel
Switzerland
+ 41 61 373 4111
+ 41 61 373 4912
| sales@tettex.com
Haefely Test AG – Beijing Office
No. 67, Chaoyang Road, Chaoyang District
| sales@haefely.com.cn
China
8-1-602, Fortune Street
Beijing, 100025
P. R. China
+ 86 10 8578 8099
+ 86 10 8578 9908
North America
Hipotronics Inc.
1650 Route 22
PO Box 414
Brewster, NY 10509
USA
+ 1 845 279 3644
+ 1 845 279 2467
| sales@hipotronics.com
a brand of
Haefely has a policy of continuous product improvement. Therefore we reserve the right t o change design and specification without notice. LL_2293_0311_SG - 4/4
Haefely is a subsidiary
of Hubbell Incorporated.
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