Transformer winding deformation tester is used to test power transformers with voltage levels of 6KV and above and other special-purpose transformers. Power transformers are inevitably subjected to various fault short-circuit currents or physical impact during operation or transportation. Under strong electromotive force, the transformer windings may lose stability and cause 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.
Transformer winding deformation test system's main technical features:
• Tests can be performed without the transformer hanging or disassembling.
• Use the most popular swept frequency method for measurement.
• This instrument can measure transformers above 6kV.
· With a split architecture, USB, wired or wireless network connections are used between the test host and the host computer for plug and play.
·The field wiring is simple and easy to use.
Wide measurement dynamic range: -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, wired network or wireless network.
·Signal 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 the software, the maximum amplitude of ±12V, the signal output impedance is 50Ω, the input impedance is low resistance 50Ω, input Impedance high resistance 1MΩ optional.
• Two acquisition channels, one to acquire the excitation signal and one to collect the response signal, used to calculate the transfer function.
• The excitation channel measurement is a fixed range: ±12V; the response channel has multiple ranges and the range is automatically adjusted during the measurement. The maximum input signal is ±25V.
Accuracy of acquisition channels: 12 bits.
The maximum static error of the acquisition channel: 0.5%.
· Maximum storage capacity per channel: 64K samples.
The highest sampling rate per channel: 20Msps.
· Acquisition channel input impedance: 1MΩ.
Sweep frequency measurement range: 10Hz-10MHz.
Scanning method: sweeping measurement with linear or logarithmic distribution.
Scan frequency accuracy: The frequency source output sine signal frequency accuracy is not more than 0.01%.
· Frequency sweep frequency measurement: Fixed mode or user-defined.
· Meet the national power industry standard: DL/T911-2004.
The main features of the test analysis software:
·Using windows platform, compatible with Window 2000/Windows XP/Vista/Win7.
· Use access database to save test data, the management of test data is simple and convenient.
· It can load 6 curves at the same time, the relevant parameters of each curve are automatically calculated, and the deformation of the winding is diagnosed automatically, and the diagnosis conclusion is given.
The software management function is powerful, fully considers the need of the scene use, preserves 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 a lot of input on 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.
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