Internal structure fault detection of power transformers essential tools
Transformer winding deformation test instrument Based on the measurement of the characteristic parameters of transformer internal winding, the internal fault frequency response analysis (FRA) method which is being developed in developed countries is adopted to make an accurate judgment of transformer internal fault.
After the design and manufacture of transformer is completed, the line coil and internal structure are determined. Therefore, for a multi-winding transformer line coil, if the voltage grade is the same and the winding method is the same, the corresponding parameters (Ci, Li) of each line coil should be determined. Therefore, the frequency domain characteristic response of each line coil is determined accordingly, and the frequency spectrum of the corresponding three-phase line coil is comparable to some extent.
The distribution parameters of transformer windings will change when short-circuit between turns and phases occurs in the test process, or collision occurs in the transportation process, resulting in the relative displacement of the line coil, and the deformation of the line coil caused by electromagnetic tension in the short-circuit and fault state during the operation process. Then it influences and changes the original frequency domain characteristics of the transformer, that is, amplitude change of frequency response and resonance frequency offset. The transformer winding test instrument developed according to the response analysis method is such a novel non-destructive testing equipment for transformer internal faults. It is suitable for the internal structure fault detection of 63kV ~ 500kV power transformer.
product names：Electric power transformer winding deformation test instrument、Transformer winding deformation detector、Transformer winding deformation meter、Transformer winding deformation analyzer
|Linear sweep distribution||Sweep measuring range||(1kHz)～(2MHz)|
|Sectional sweep measurement distribution||Sweep measuring range||(0.5kHz)～(1MHz)|
|Range of amplitude||(-100dB)～(+20dB)|
|Accuracy of amplitude measurement||±1dB|
|scanning frequency accuracy||0.01%|
|signal input impedance||1MΩ|
|signal output impedance||50Ω|
|In phase test repetition rate||99.5%|
|Measuring instrument size (length × width × height)||300×340×120mm3|
|Instrument aluminum alloy packing box size(length x width x height)||310×400×330mm3|
|The overall weight||10kg|
1.The appearance of the product shall be subject to the actual product，Technical parameters with model if there are any changes，without notice.In case of misappropriation or copying, legal liability will be investigated.
1、Transformer winding deformation test instrument acquisition and control adopt high speed and high integration microprocessor.
2、USB interface for laptop with instrument communication
3、No line bluetooth interface between laptop and instrument
4、The hardware movement adopts DDS special digital high-speed frequency sweeping technology (USA). Through the test, the faults of winding distortion, bulge, shift, tilt, short-circuit deformation between turns and pick up short-circuit between phases can be accurately diagnosed
5、High-resolution dB value measurement, dual-channel 16-bit A/D
6、 The signal output amplitude can be adjusted by software to a maximum peak of 10V
7、The computer generates an electronic document of the results(Word)
8、Select precise and highly stable components, repeat the test on the same phase, and measure the repetition rate above 99.5%
9、Finished circuit board, surface is specially treated, resistant to water and harmful gas pollution
10、The Transformer winding deformation test instrument produced by our company has the functions of linear sweep frequency measurement and piecewise sweep frequency measurement, and is compatible with the measuring modes of the current two domestic technical schools
11、The amplitude-frequency characteristic conforms to the national technical index of amplitude-frequency characteristic test instrument. The abscissa (frequency) has two kinds of line-like indexing and logarithmic indexing, so the printed song line can be either line-like or logarithmic indexing line, which can be selected by the user according to the actual situation
Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T28001-2011 occupational health and safety management system requirements.