Atec 2293 User Manual

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.