Why is it necessary to do a transformer winding deformation test?
As a key equipment in the power system, the stable operation of transformers is crucial to the safety of the power grid. However, transformers may cause deformation of the windings for various reasons during testing, transportation, and operation, which in turn affects their performance. In this paper, we will analyze the causes and effects of transformer winding deformation, and discuss effective detection techniques.
1. The causes of transformer winding deformation
(1) Short-circuit fault current impact During the operation of power transformers, short-circuit faults produce a huge impact current that will produce a strong electromotive force on the windings, resulting in winding heating, and mechanical strength decline, which triggers deformation. According to statistics, short-circuit fault current impact is the main external factor causing transformer winding deformation.
(2) Accidental impact during transportation and installation Transformer in long-distance transportation, installation, or overhaul process, may be subjected to accidental impact, bumps, and vibration, these factors may lead to deformation of the winding.
(3) Defective protection system The dead zone or malfunction of the protection system will cause the transformer to withstand a longer period of stable short-circuit current during a short-circuit fault, which will lead to deformation of the windings.
2. The impact of transformer winding deformation
Winding deformation, the transformer may be immediately damaged, may also be able to run for some time. However, conventional electrical tests are difficult to find winding deformation, which poses a serious threat to the safe operation of the grid. The specific effects are as follows:
(1) Deterioration of insulation performance Winding deformation may lead to changes in insulation distance or insulation paper damage, so that the transformer under over-voltage or long-term operating voltage breakdown occurs, and ultimately lead to damage.
(2) Mechanical performance degradation After the winding deformation, when it suffers another short circuit accident, the transformer may be damaged because it can not withstand the impact force.
3. The transformer winding deformation detection technology
In order to ensure the safe operation of the transformer, timely detection of winding deformation is essential. At present, the main detection methods are as follows:
1. Low voltage impulse analysis method
2. Frequency response analysis method
3. Impedance analysis method
4. Water wave analysis method
5. Ultrasonic analysis method
The industry generally believes that the frequency response method and short circuit impedance method is a more effective way to detect transformer winding deformation. By measuring the consistency of the frequency response characteristics of each winding of the transformer, combined with the structure of the equipment, operation and other test items for a comprehensive, historical, comprehensive analysis and comparison, you can accurately determine the degree of deformation of the winding.
Equipment Recommendations
RDRB-V Sweep Frequency Response Analyzer Features：
1. Precision Detection Without Dismantling:
Directly identify winding issues such as distortion, expansion, or displacement in transformers of 6kV and above by analyzing the amplitude-frequency response characteristics of the windings, without the need to open the transformer.
2. Rapid Measurement Completion:
Each winding measurement takes only 2 minutes, ensuring high efficiency.
3. High Frequency Accuracy:
The equipment offers a frequency accuracy of over 0.001%, which is at the leading edge in the industry.
4. Stable Frequency Synthesis Technology:
Utilizing digital frequency synthesis ensures the accuracy of measurements.
5. Safe Testing:
The testing system is equipped with 5000V voltage isolation, ensuring the safety of operations.
6. Powerful Analysis Tools:
The software is comprehensive, adhering to national DL/T911-2016/IEC60076-18 standards, with reliable performance.
7. Simplified Operation Process:
The intelligent software allows for all measurements to be completed with a single click after parameter setup, making the operation straightforward.
8. Clear User Interface:
The interface is designed to be simple and intuitive, making data analysis, saving, report exporting, and printing effortlessly manageable.
Click RDRB-V for detailed product parameters.
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