Method for reducing transient impact load of switch operating mechanism insulating pull rod

Abstract

The invention discloses a method for reducing a transient impact load of a switch operating mechanism insulating pull rod and belongs to the field of high-voltage switch and digital simulation study. The method comprises a first step of establishing a transient dynamics finite element model according to a geometric model of a switch, implementing dynamic calculation of the high-voltage switch separating brake process, and extracting a transient impact load peak of the insulating pull rod; a second step of parameterizing a contact surface shape; a third step of performing design of experiment (DOE) calculation and sensitivity analysis; and a fourth step of utilizing an optimization algorithm to search an optimal reference point and producing an optimal spline. According to the method, impact stress generated on the insulating pull rod during switch motion can be effectively reduced, and switch reliability is improved.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of high-voltage switch and digital simulation research, in particular to a method for reducing the transient impact load of an insulating pull rod of a high-speed switch operating mechanism. [0003] 【Background technique】 [0004] With the development of the power system, the power system has higher and higher requirements for power switches. The electromagnetic repulsion operating mechanism based on the principle of eddy current repulsion has become a research hotspot because of its outstanding advantages in rapidity and reliability. The repulsion operating mechanism has the advantages of simple structure, extremely fast action speed and high reliability, so it has been paid attention to and studied by scholars at home and abroad. [0005] The electromagnetic repulsion mechanism is connected with the vacuum interrupter to form a high-speed vacuum switch. When the vacuum switch is opened, the peak value of t...

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Problems solved by technology

[0005] The electromagnetic repulsion mechanism is connected with the vacuum interrupter to form a high-speed vacuum switch. When the vacuum switch is opened, the peak value of the repulsion force generated by the electromagnetic repulsion mechanism can reach tens or even hundreds of kN, so that the insulating pull rod that acts as a transmission will suffer a huge pulse. The repulsive force is repeatedly impacted, and it is easy to break, which leads to a sharp decrease in the reliability of the vacuum switch

After analysis, it is found that the transmission of force is completed through the contact spring assembly of the vacuum switch, and the contact and collision of the two parts in the contact spring assembly during the transmission process will cause repeated impact loads to act on the insulating pull rod, resulting in damage to the Stress impact on insulating tie rods

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