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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 is a subsidiary of Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice. |
LL_2293_0311_SG - 1/4 |
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
printing.
Select
Start
Results can also be saved in the instrument’s memory while continuing testing, to be downloaded later after having returned to the office.
Results
a brand of
Haefely is a subsidiary of Hubbell Incorporated.
Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice. |
LL_2293_0311_SG - 2/4 |
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