Power transformer winding deformation tester operation use
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Power Transformer Winding Deformation Tester (Frequency Response Method) is used to test power transformers with voltage levels of 6KV and above and other special-purpose transformers. The power transformers are inevitably subjected to various faults and short circuit currents during operation or transportation. Impact, under the action of the powerful electrodynamic force generated by the short-circuit current, the transformer winding may lose stability, resulting in permanent distortion such as local distortion, bulging or shifting, which will seriously affect the safe operation of the transformer. According to the national power industry standard DL/T911-2004, the frequency response analysis method is used to measure the winding deformation of a transformer by detecting the amplitude-frequency response characteristics of each winding of the transformer, and comparing the detection results in a longitudinal or horizontal manner, according to the change of the amplitude-frequency response characteristics. To determine the possible deformation of the transformer windings.
The transformer winding deformation tester (frequency response method) is composed of a measurement part and analysis software part. The measurement part is a black box consisting of signal generation and signal measurement. The analysis part is completed by a laptop computer, and the measurement part is connected to the laptop computer via USB or network.
First, the power transformer winding deformation tester safe working guidelines
Before using the transformer winding test equipment, please read this chapter carefully. So that you know important safety points and warnings.
Please use this tester following the instructions in this manual, otherwise the protection provided by the tester may be damaged.
In this manual:
[Warning] refers to a situation or operation that poses a danger to users or collecting instruments.
[Caution] refers to the condition or operation that may cause damage to the tester or the transformer being tested.
[Note] refers to situations or operations that may cause errors in the test results.
To avoid personal injury and to avoid damage to the tester or the transformer being tested, follow these guidelines:
[Warning] The transformer core must be reliably grounded to the housing. The tester enclosure and the measured impedance enclosure must be reliably grounded to the transformer enclosure.
[Warning] Do not start the winding deformation test before the tester's "grounding" is connected properly.
[Caution] Before the test, fully discharge the line of the tested transformer.
[Caution] Before use, please check the appearance of the tester and check if the position of the power switch is in the “OFF” position and whether each terminal is normal.
[Note] The winding deformation test shall be performed on the premise of solving all the leads of the transformer (including overhead lines, closed buses and cables), and keep these leads away from the transformer casing as far as possible (the surrounding grounding body and metal suspension must leave the transformer Over 20cm), especially the transformer connected to the enclosed busbar.
[Caution] The position of the tap changer must be correctly recorded during the test. The tap-changer of the transformer to be tested should be placed on the first tap as much as possible, especially for the on-load tap-changer, in order to obtain a more comprehensive winding information. For no-load regulator transformers, ensure that each measurement is at the same tap position for comparison.
[Caution] It should be ensured that the clamps measuring impedance are in close contact with the bushing clamps. If there is conductive paste or rust on the bushing clamp, it must be wiped clean with an abrasive cloth or a dry cotton cloth.
Second, power transformer winding deformation tester main technical features:
The test can be performed without hanging the transformer or disassembling the transformer.
Use the most popular swept frequency method to measure.
This instrument can measure transformers above 6kV.
Using a split-type structure, the USB connection between the test host and the host computer is used for plug and play.
Field wiring is simple and easy to use.
Wide dynamic range of measurement: -100dB to 20dB.
The analysis software is powerful and the software and hardware indicators meet the national standard DL/T911-2004.
Transformer winding deformation tester (frequency response method) of the main technical indicators:
Test host and PC interface: USB.
Source: The instrument comes with a channel signal output as a frequency sweep excitation signal; the signal output is a standard sine wave, the signal output amplitude can be adjusted by software, the maximum amplitude of ± 10V, the signal output impedance of 50Ω.
Two acquisition channels, one to acquire the excitation signal and one to collect the response signal, are used to calculate the transfer function.
Acquisition channel quantization accuracy: 14 bits.
Maximum storage capacity per channel: 64K samples.
Maximum sampling rate per channel: 25Msps.
Acquisition channel input impedance: 1MΩ.
Sweep frequency measurement range: 500Hz-2000kHz.
Scanning method: Linear sweeping frequency measurement method is used.
Scanning Frequency Accuracy: The accuracy of the frequency of the signal output sine signal is not more than 0.01%.
Sweep frequency measurement points: fixed mode or user-defined.
Meet the national power industry standards: DL/T911-2004.
The main features of the test analysis software:
Using windows platform, compatible with Window 2000/Window XP.
Two curves can be loaded at the same time, the relevant parameters of each curve are automatically calculated, the deformation of the winding is automatically diagnosed, and the diagnosis conclusions are given.
The software management function is powerful, fully consider the need of on-the-spot use, save the environmental condition parameter automatically, in order to provide the basis for the transformer winding deformation diagnosis. The measurement data is automatically saved and has a color printing function, which facilitates the user to output the test report.
The user-friendly features of the software are obvious, and the various conditions for measurement are mostly options. There is no need to make many inputs at the site, and the use of personnel is more convenient.
The software has a high degree of intelligence. After the input and output signals are connected, only one key press is required to complete all measurement tasks.
The software interface is simple and intuitive.
Third, power transformer winding deformation tester preparation
Note: The basic operation involving the computer and the Windows operating system in the operating instructions is not in this manual. Please refer to the relevant computer books.
Note: The basic operation of the Windows operating system in the user's manual is based on the Windows XP operating system. The difference between the operation of Windows 2000 and the operation of Windows XP is not in this manual. Please refer to the relevant computer books.
Fourth, the use of power transformer winding deformation tester
Acquisition instrument USB driver installation
Driver installation
After the hardware circuit is connected to the computer, if it is connected for the first time, the computer will prompt to find a new device, insert the driver CD into the computer, and install the driver. When the hardware circuit is connected with the computer, there is no program on the card at this time. Its default ID number is: VID: 0x04B4; PID: 0x8613. The computer uses this ID number to find the wdgtldr.sys file. The wdgtldr.sys file contains the microcontroller program. It passes the MCU program to the MCU on the acquisition card in some way and allows the program to run. After that, the microcontroller has a new ID number. Through this ID number, the computer finds the ezusb.sys file. The ezusb.sys file is provided by Cypress. It provides support for USB data transfer. In the application software, it passes through it. Data transmission and control. Due to the online loading technology used in the system design, 2 new hardware will be found and you can follow the prompts.
Connect the data cable. If the communication is normal, the communication (V2) and mode (V3) indicators on the acquisition card will light up. And you can see the hardware device in the hardware resources of the computer, as shown in the following figure:
Copy the WDGTLDR.sys and ezusb.sys files manually to the winnt\sySGem32\drivers directory, connect the USB capture card, and follow the prompts to install the driver.
Control registration
1, positioning and installation methods;
2, system installation method
Acquisition procedure
Or run the setup file
If you reinstall the system, please contact the manufacturer to modify the configuration file, otherwise it will affect the machine accuracy.
You must carefully read the relevant provisions of Part 2 of the Code of Safe Conduct.
Test wiring
The front and rear panels of the transformer winding deformation tester (frequency response method) are shown in Figure 4.1.
Figure 4.1 Transformer winding deformation tester (frequency response method) front and rear panel
The external wiring diagram for transformer winding deformation test is shown in Figure 4.2. The "signal" and "input" terminals of the transformer winding deformation tester (frequency response method) input the sweep frequency voltage signal to the end of the "tested transformer" winding through the "input measurement impedance" and the voltage signal at the head end of the "tested transformer" winding. The "output" side of the tester entered via "Output Measurement Impedance". The "ground" of the transformer and the shell of the transformer under test are grounded together with the core. The laptop computer is connected to the "communication" port of the tester through the USB communication cable or the network, so that the acquisition instrument can be controlled.
Figure 4.2 External Wiring Diagram of Transformer Winding Deformation Test
Winding wiring
The sweep signal of the winding deformation frequency response test is recommended to be injected from the end of the winding, the output of the first end, and the untested winding is left unconnected. According to the different wiring groups of the transformer, the wiring of the winding deformation test is also different.
4.1.1 YN Wiring
The input impedance of the sweep signal is connected to the neutral point O, and the output impedance of the sweep signal is connected to A, B, and C, respectively. This measurement method can absorb the interference signal received on the non-measurement phase by the low impedance on the signal generator. As shown in Figure 4.1.1.
4.1.2 Y connection
Since the neutral point is not drawn, it should be wired as follows, as shown in Figure 4.1.2.
The input impedance is connected to A, and the output impedance is connected to B test.
The input impedance is connected to B, and the output impedance is connected to the C test.
The input impedance is connected to C, and the output impedance is connected to A test.
The wiring of the inner connection Δ wiring winding is shown in Figure 4.1.3.
The input impedance is connected to c and the output impedance is connected to phase a, which represents phase a.
The input impedance is connected to a and the output impedance is connected to phase b, which represents b phase.
The input impedance is connected to b, and the output impedance is connected to c-phase, which represents c-phase.
Since the two windings of the inner connection Δ wiring that are not measured are connected in series in parallel after being connected in series, it is theoretically influential to the test process. If the attenuation exceeds 10 dB, then the effect of non-measurement coils can be considered negligible.
4.1.4 External Connection Δ Connection
If the winding is disconnected, the measured wiring is shown in Figure 4.1.4. If you do not solve the connection, you can think of the internal connection Δ wiring. The wiring is shown in Figure 4.5.
The input impedance is connected to x and the output impedance is connected to phase a, which represents phase a.
The input impedance is connected to y, and the output impedance is connected to phase b, which represents b phase.
The input impedance is connected to z, and the output impedance is connected to c-phase, which represents c-phase.
4.1.5 Transformers with Balanced Windings
For transformers with balanced windings, the ground must be uncoupled during testing. As shown in Figure 4.1.5.
KD-3006 power transformer winding deformation tester
Test Considerations
The instrument must be powered up after the wiring is fully connected.
The ground wire of the instrument must be connected to the core and shell of the transformer being tested.
Fifth, power transformer winding deformation tester application software interface
With the significant increase in CPU processing speed and memory read/write speed, in order to make full use of computer resources and reduce costs, consider real-time data collection through software data extraction, coordinate lookup table mapping, control display, and multi-threading technologies. display.
The user program mainly completes the acquisition of parameter settings and the real-time display of acquired data. You can observe the response channel output signal collected in time domain coordinates, and save the collected data in binary format on the computer hard disk. By analyzing the data of the collected amplitude-frequency files, two sets of amplitude-frequency curves can be drawn at the same time, and the correlation coefficients of the two curves can be calculated in real time, the deformation of the windings can be automatically diagnosed, and the diagnosis conclusions can be given.
Detailed function:
DDS parameter settings
Enter the corresponding value, such as peak-to-peak voltage, the system default value is 20V, if you modify this value may reduce the dynamic range. It is generally the default value.
The starting frequency is a minimum of 0.5 KHz and the termination frequency is a maximum of 2 MHz. (Please select 1-1000KHZ for analysis of correlation coefficient)
Stepping frequency is automatically generated.
Click "Set" button after completion
Acquisition parameter settings
Click "Write Path" to enter the winding name file. When the sweep is over, this file is the amplitude-frequency curve of this winding. When the "trigger count" is over 1000, you can click "Stop acquisition" and the 1000-point amplitude-frequency curve has been completed.
As the second curve is the same as above (Note: Replace the file name).
data analysis
Transferred, one frequency file, two frequency file, three frequency file. Click Start to analyze and generate three TXT files with the same name as the file name. And show the amplitude frequency curve. (must be the same band curve to show normal)
R12 is the correlation coefficient between the first and second curves.
R13 is the correlation coefficient between the first and third curves.
R23 is the correlation coefficient of the second and third curves.
The two curves for the analysis of the correlation coefficient must be in the 1-1000 KHz frequency band.
The winding deformation degree is as follows
Six, equipment maintenance
This section provides basic maintenance information. Try not to disassemble, modify, and repair the transformer winding deformation tester (frequency response method) as far as possible.
6.1 Basic Maintenance
Periodically wipe the surface of the tester and its accessories with a clean cloth.
The tester should be placed in a clean, low humidity location and prevent dirty dust from entering the tester.
This manual is for reference only, subject to change without notice
respected user:
Thank you for your attention to our products. In addition to this product introduction, the company also has insulation ladders, high-voltage insulation mats, cable fault testers, high-voltage measuring instruments, pressure test equipment for insulated boots gloves, power safety equipment cabinets, etc. If you are interested in our products, welcome to inquire. Thank you!

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