During the operation of the power system, the phenomenon of series resonance has always been a key concern for engineering technicians. As a special type of electrical resonance, series resonance not only affects the stable operation of the system, but also may cause equipment damage and even trigger safety accidents. In recent years, the insulating base, as a new solution, has shown remarkable effects in suppressing series resonance, providing new technical guarantees for the safe operation of the power system.
I. Basic Principles and Hazards of Series Resonance
When the inductive reactance and capacitive reactance in the power system reach equilibrium at a specific frequency, a series resonance phenomenon occurs. This resonance causes abnormal voltage increase, posing a serious threat to electrical equipment. Series resonance is particularly common in equipment such as transformers and capacitor banks. When resonance occurs, the system voltage may rise to several times the rated value, sufficient to break through the insulation layer and cause equipment damage. Moreover, resonance also generates excessive current, accelerating equipment aging and shortening its service life.
II. Working Principle of the Insulating Base
The insulating base suppresses resonance by altering the equivalent parameters of the system. The key lies in adjusting the equivalent capacitance and inductance of the system to shift the resonant frequency away from the operating frequency range. Specifically, the insulating base employs specially designed insulating materials and structures to effectively modify the ground capacitance of the equipment. Although this change is minor, it is sufficient to disrupt the resonant conditions and achieve the purpose of suppressing resonance. Compared with traditional de-resonation measures, the insulating base has significant advantages such as simple installation, no need for additional power supply, and low maintenance costs.
III. Technical Features of the Insulating Base
1. Material properties: Utilizes high-performance polymer composite materials, featuring excellent dielectric properties and mechanical strength. 2. Structural design: Multi-layer composite structure to ensure stable electrical performance. 3. Temperature adaptability: Wide operating temperature range, capable of stable operation in a temperature range of -40°C to +85°C. 4. Weather resistance: Resistant to ultraviolet rays, moisture, and corrosion, suitable for long-term outdoor use. 5. Installation convenience: Standardized design, can be directly replaced with the original base, without the need for equipment modification.
IV. Analysis of Practical Application Cases
During the renovation project of a 500kV substation, the technicians discovered that there was a significant series resonance problem with the capacitor bank. By installing specially designed insulating bases, they successfully adjusted the resonance frequency from the original 315Hz to 450Hz, which was far away from the system’s operating frequency. After the renovation, measurements showed that the resonant voltage decreased from the original 2.8 times the rated value to 1.2 times, achieving a remarkable effect. Similar successful cases have been demonstrated in multiple power grid projects, fully proving the practical value of the insulating bases.
V. Key Design Points of the Insulating Base
1. Parameter matching: The design must be customized according to the electrical parameters of the specific equipment.
2. Safety margin: There should be sufficient safety margin to ensure reliable operation under various working conditions.
3. Mechanical strength: It must meet the requirements of equipment weight and seismic resistance.
4. Insulation performance: It should be higher than the insulation level of the equipment itself.
5. Thermal stability: Ensure that the performance does not deteriorate during long-term operation.
VI. Future Development Trends
With the advancement of smart grid construction, insulation base technology is also constantly evolving. The new generation of products now integrate sensors and communication modules, enabling real-time monitoring of resonance status and automatic parameter adjustment. Moreover, the application of nanomaterials is expected to further enhance the performance of insulation bases. It is anticipated that smart insulation bases will become the mainstream product in the market within the next five years.
VII. Economic Benefit Analysis
From the perspective of the total life cycle cost, the insulated base has significant advantages. Although the single purchase cost is slightly higher than that of the traditional solution, its maintenance-free feature and long service life can significantly reduce operation and maintenance costs. According to statistics, substations using insulated bases can save maintenance costs by an average of 15% – 20% per year, and the investment recovery period is usually between 2 and 3 years.
VIII. Installation and Maintenance Precautions
Before installation, detailed parameter calculations and simulation verification must be carried out.
2. During the installation process, ensure that the contact surfaces are clean to avoid the influence of dirt on the insulation performance.
3. Regularly inspect the appearance condition. If cracks or deformations are found, replace the part immediately.
4. Increase the frequency of inspections during extreme weather conditions.
5. Establish a complete equipment file to record the changes in operating parameters.
The insulating base, as an effective means to suppress series resonance, has been widely applied in the power system. Its unique working principle and remarkable technical advantages provide a reliable solution to the resonance problems that have long plagued the power industry. With the continuous advancement of technology, the insulating base will surely play a greater role in ensuring the safe operation of the power grid.
Post time: Jan-05-2026