Internal structure fault detection of power transformers essential tools
Reference standard: DL/T 911-2016
Note:
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According to the measurement of the characteristic parameters of the internal winding of the transformer, the instrument adopts the internal fault frequency response analysis (FRA) method that is being developed in developed countries in the world to make an accurate judgment of the internal fault of the transformer.
After the transformer is designed and manufactured, its coil and internal structure are determined, so for a multi-winding transformer coil, if the voltage level is the same, the winding method is the same, then the corresponding parameters of each coil (Ci, Li) should be determined. Therefore, the frequency domain characteristic response of each coil is also determined, and the frequency spectrum of the corresponding three-phase coils has a certain comparability.
Transformer in the test process between turns, interphase short circuit, or collision in the transport process, resulting in the relative displacement of the coil, as well as in the operation process in the short circuit and fault state due to electromagnetic tension coil deformation, will make the distribution parameters of the transformer winding change. Then it affects and changes the original frequency domain characteristics of the transformer, that is, the amplitude change of the frequency response and the shift of the resonant frequency point. The transformer winding tester developed according to the response analysis method is such a novel nondestructive testing equipment for transformer internal faults. It is suitable for the internal structure fault detection of 63kV ~ 500kV power transformers.
product names：Electric power transformer winding deformation test instrument、Transformer winding deformation detector、Transformer winding deformation meter、Transformer winding deformation analyzer
| Linear sweep frequency measurement range | (1kHz)～(1MHz) |
| Segment sweep frequency measurement range | (0.5kHz)～(1kHz) |
| (0.5kHz)～(10kHz) | |
| (10kHz)～(100kHz) | |
| (100kHz)～(500kHz) | |
| (500kHz)～(1000kHz) | |
| Range of amplitude | (-100dB)～(+20dB) |
| Accuracy of amplitude measurement | +20dB～-60dB;±1dB |
| -60dB～-100dB;±2dB | |
| Sweep accuray | 0.01% |
| signal input impedance | 1MΩ |
| signal output impedance | 50Ω |
| In phase test repetition rate | 99.5% |
| Measuring instrument size (L × W × H) | 300×340×120mm3 |
| Instrument aluminum alloy packing box size (L × W × H) | 310×400×330mm3 |
| 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.
2. For more information about Wuhan UHV, please enter product center . Service email：info@hvtest.cc
1、The hardware movement adopts DDS special digital high-speed frequency sweep technology to accurately diagnose winding twisting, bulging, displacement, tilt, turn short circuit deformation and interphase contact short circuit.
2、The acquisition control adopts highly integrated microprocessor, selects precision and high-stability components, high-speed dual-channel 16-bit A/D sampling (the field test changes the tap-changer, and the waveform curve has significant changes), and repeats the test for the same phase, and the measurement repetition rate is above 99.5%.
3、The instrument has the function of linear sweep frequency measurement and segmented sweep frequency measurement, which is compatible with the measurement mode of two domestic technical schools.
4、In the test process, only the connecting bus of the transformer needs to be removed, and all tests are completed without the need to lift and disassemble the transformer.
5、When measuring the transformer, the wiring personnel can arrange the signal input and output leads at will, which has no effect on the measurement results, and the wiring personnel can stay above the transformer tank, without having to come down to reduce the labor intensity.
6、The amplitude-frequency characteristic conforms to the technical index of the national amplitude-frequency characteristic tester. The horizontal coordinate (frequency) has two kinds of linear indexing and logarithmic indexing, so the printed curve can be a linear indexing curve or a logarithmic indexing curve, and users can choose according to actual needs.
7、The instrument is highly intelligent, the signal output amplitude is automatically adjusted by the software, the maximum peak value is ±10V, and the sampling frequency is automatically adjusted.
8、The instrument has a variety of frequency linear sweep measurement system measurement functions, linear sweep measurement scanning frequency up to 1MHz, frequency scanning interval can be divided into 0.25kHz, 0.5kHz and 1kHz, to provide more analysis of transformer deformation.
9、Provides comparative analysis of historical curves, can load multiple historical curve observation at the same time, can select any curve for horizontal and vertical analysis. Equipped with expert intelligent analysis and diagnosis system, it can automatically diagnose the state of the transformer winding, load 6 curves at the same time, and calculate the relevant parameters of each curve automatically, automatically diagnose the deformation of the winding, and give the diagnostic reference conclusion.
10、The software management function is powerful, fully considers the needs of field use, automatically saves the environmental conditions parameters, in order to provide a basis for transformer winding deformation diagnosis. The measurement data is automatically analyzed and saved, and the electronic document (Word) is generated and saved, and the color printing function is convenient for users to produce test reports.
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/T45001-2020 occupational health and safety management system requirements.
email： info@hvtest.cc
Skype： Tina Qiao
+8615172408058
