How to evaluate the seismic performance of oil-immersed transformers?
Time：2024-12-30 Auther：ZTelec-www.ztelectransformer.com
As an important equipment in the power system, the operating stability and safety of oil-immersed transformers are of vital importance. In areas where earthquakes occur frequently, the seismic performance of transformers is directly related to their performance in earthquakes and whether they can continue to provide a stable power supply to the power system. Therefore, it is particularly important to evaluate the seismic performance of oil-immersed transformers.
Methods and standards for evaluating seismic performance
1. Static analysis
Static analysis is the basis for evaluating the seismic performance of oil-immersed transformers. By analyzing the stress conditions of the transformer under daily working conditions, we can understand the stress distribution and deformation of its structure under static load. This helps to discover potential structural weaknesses and provide a basis for subsequent seismic design.
2. Dynamic analysis
Dynamic analysis is a key step in evaluating the response and performance of oil-immersed transformers under earthquakes. This usually includes analysis of seismic wave propagation, transformer dynamic response, and structural damage. Through dynamic analysis, we can understand the changes in parameters such as displacement, acceleration, and stress of the transformer during an earthquake, thereby evaluating its seismic performance.
3. Earthquake resistance test
An earthquake resistance test is a direct method to verify the earthquake resistance of oil-immersed transformers. By simulating the vibration and impact under the action of earthquakes, the structural response and damage of the transformer can be observed. Earthquake resistance tests usually include shaking table tests and impact tests. These tests can provide data on the actual performance of transformers in earthquakes and provide valuable references for earthquake resistance design.
4. Evaluation standards and specifications
When evaluating the earthquake resistance of oil-immersed transformers, relevant standards and specifications need to be followed. These standards and specifications usually include the basic principles of transformer earthquake resistance design, calculation methods, test requirements, and safety assessment. In addition, the earthquake resistance design specifications of various countries also provide specific requirements for the earthquake resistance of electrical equipment.
How to improve the seismic performance of oil-immersed transformers?
Use rubber shock absorbers: Rubber shock absorbers can effectively absorb and attenuate vibrations, reduce the mechanical vibrations generated by transformers during operation, and thus reduce the risk of equipment damage. Rubber shock absorbers use their excellent elasticity and durability to consume vibration energy through elastic deformation and internal friction of rubber, converting mechanical energy into heat energy, thereby achieving a buffering and shock-absorbing effect.
Install a spring shock absorber: The spring shock absorber converts vibration energy into elastic potential energy by utilizing the characteristics of elastic elements, thereby reducing the transmission of vibration to the transformer body. This shock-absorbing effect can significantly reduce mechanical failures and extend equipment service life. Spring shock absorbers have strong adaptability and can work stably in various climates and geographical environments. The installation process is relatively simple, saving time and labor costs.
Optimize transformer design: Consider the need for earthquake resistance in transformer design, and adopt a multi-layer cylindrical high-voltage winding structure to ensure balanced ampere-turn distribution, small magnetic leakage, high mechanical strength, and strong short-circuit resistance. The core and winding are fastened to withstand transportation shock. In addition, the oil tank adopts a corrugated sheet design with a breathing function to compensate for the change in oil volume caused by temperature changes.
Regular maintenance and inspection: Regularly maintain and inspect the transformer to ensure that the anti-loosening measures of all fastening parts (such as height of the device, low-voltage leads, etc.) are effective, and any looseness or damage that may exist is handled in a timely manner to ensure the stable operation of the transformer.
