干式空心并联电抗器是电力系统中一种重要的无功补偿装置，其运行的稳定性直

Dry-type air-core shunt reactor is an important reactive power compensation device in the power system, and the stability of its operation is directly related to the quality of the power transmission in the power system. The electromotive force generated during the operation of the reactor may cause the cracking of the encapsulation insulation, which in turn causes damage to the reactor. There are two main reasons for the insulation cracking: excessive electromotive force generated by the leakage flux causes strength damage; leakage; The magnetic flux generates alternating electric power and causes fatigue damage. In the engineering, only the tensile strength limit of the insulating material is specified, and the fatigue damage research is not enough. This paper verifies through Maxwell simulation that during normal operation, even if the electromotive force generated by magnetic flux leakage meets the material's tensile strength requirements, the strain margin for fatigue failure is not satisfied. Therefore, magnetic flux leakage shielding should be done. <br>This article intends to damage the body due to the stress change caused by the leakage of the air-core reactor. According to the electrodynamic formula, the electromotive force is proportional to the magnetic induction intensity. Knowing the situation, the magnetic flux leakage value is obtained through the magnetic field simulation, and the electromotive force value is finally calculated, which proves that the electromotive force is within its acceptable range and has sufficient margin when the phase spacing of the dry-type air-core reactor is 1.7D. However, the fatigue stress is generally 2% of the tensile strength. Although it meets the requirements, the margin is small, and fatigue failure occurs after the wire passes 10^6 cycles. Therefore, fatigue failure accidents are prone to occur after long-term operation. <br>On the basis of the existing magnetic field shielding theory, this paper proposes a new magnetic leakage shielding method, which starts with reducing the magnetic leakage to simulate and analyze the air-core reactor, and compares the parameters of the inner shield plate to obtain the optimized parameters, and finally reduces The magnetic flux leakage reduces the fatigue stress and increases the safety of the reactor. <br>Under the premise that the magnetic leakage of the reactor itself is reduced, the shielding method is applied to the three-phase reactor group to reduce the magnetic leakage that becomes larger due to the superposition effect; from another perspective, discuss the reduction of the electric power value under the condition of the same Type air-core reactors are spaced apart, thereby reducing the footprint of the entire device, and providing another placement plan when the installation site is insufficient. And on this basis, the magnetic field distribution after changing the installation method and installation height of the reactor is discussed, and it is confirmed that the shielding plate has an effect on the reactor group of different installation methods, and the magnetic leakage of the prop height close to the ground will be reduced if the height of the pillar is appropriately increased. Finally, the eddy current effects of air-core reactors are discussed, and the shielding plate is applied to eddy current shielding to reduce the adverse effects of eddy current loss.

Dry hollow and co-linked resistor is an important reactive compensation device in power system, and the stability of its operation is directly related to the quality of power transmission in power system. The electrical power generated during the operation of the resistor may cause the cracking of the enveloped insulation, which in turn causes the damage of the insulation, and there are two main reasons for the cracking of the insulation: the power generated by the leakage flux is too large to cause the intensity damage; The engineering only specifies the limit of the pull strength of the insulation material, and the study of fatigue damage is not enough. In this paper, Maxwell simulation verified that in the normal operation process, even if the electrical power generated by the leakage magnetic meets the material's pull strength requirements, the strain capacity of fatigue damage is not satisfied, therefore, the leakage magnetic shielding should be done well.<br>In this paper, it is proposed to cause damage to the body caused by the stress change caused by the leakage of the hollow resistor, according to the electrodynamic formula, the electric power ratio is equal to the magnetic induction strength, the current is set to the maximum overcurrent that the resistor can withstand, that is, the rated current 1.35 times, the size is known, the magnetic field simulation obtains the leakage magnetic value, and finally calculates the electrodynamic value, confirms that the distance between the dry hollow electron resistors is 1.7D and has sufficient capacity. However, fatigue stress is generally 2% of the pull strength, although the requirements are met but the balance is very small, and after the wire after 10 to 6 cycles will appear fatigue damage, therefore, after long-term operation is prone to fatigue damage accidents.<br>Based on the existing theory of magnetic field shielding, this paper proposes a new method of leakage magnetic shielding, which starts with the simulation analysis of hollow resistors by reducing leakage magnets, and obtains the optimal parameters by comparing the parameters of the internal shield plate, and finally reduces the fatigue stress of leakage, which increases the safety of the resistor.<br>Under the premise of the reduced leakage of the resistor itself, the shielding method is applied to the three-phase resistor group to reduce the leakage magnetization which becomes larger due to the superimposing effect, and from another angle, the distance between the near-dry hollow resistors is discussed under the constant power value, thus reducing the footprint of the whole device and providing another placement scheme when the installation site is insufficient. On this basis, the magnetic field distribution after changing the installation mode of the resistor and installing the height is discussed, and it is proved that the shield plate has effect on the resistor group of different installation modes, and the leakage of magnetism which raises the height of the pillar appropriately close to the ground will be reduced. Finally, the effects of the hollow resistor vortex are discussed, and the shielding plate is applied to the vortex shield to reduce the adverse effects of vortex loss.

Dry type air core shunt reactor is an important reactive power compensation device in power system. Its stability is directly related to the quality of power transmission in power system. The electric power generated during the operation of reactor may cause the cracking of encapsulated insulation, and then cause the damage of reactor. There are two main reasons for the insulation cracking: the excessive electric power generated by leakage flux causes strength damage; the alternating electric power generated by leakage flux causes fatigue damage. The limit of tensile strength of insulating material is only specified in engineering, and the research on fatigue failure is not enough. In this paper, Maxwell simulation is used to verify that in the normal operation process, even if the electric force generated by magnetic flux leakage meets the requirements of material tensile strength, the strain allowance of fatigue failure is not satisfied. Therefore, magnetic flux leakage shielding should be done well.<br>According to the electrodynamic formula, the electrodynamic force is proportional to the magnetic induction intensity. The current is set to the maximum over-current that the reactor can bear, i.e. 1.35 times of the rated current. When the size is known, the magnetic flux leakage value is obtained by magnetic field simulation. Finally, the electrodynamic force value is calculated, which proves that the dry-type air core reactor is reliable When the phase to phase distance is 1.7d, the electrodynamic force is within its bearing range and has enough margin. However, the fatigue stress is generally 2% of the tensile strength. Although it meets the requirements, the allowance is very small, and the conductor will appear fatigue failure after 10 ^ 6 cycles. Therefore, the fatigue failure accident is easy to occur after long-term operation.<br>Based on the existing magnetic field shielding theory, a new magnetic flux leakage shielding method is proposed in this paper. Starting from the reduction of magnetic flux leakage, the air core reactor is simulated and analyzed. The optimized parameters are obtained by comparing the parameters of the inner shielding plate. Finally, the magnetic flux leakage is reduced to reduce the fatigue stress and increase the safety of the reactor.<br>On the premise of reducing the magnetic flux leakage of the reactor itself, the shielding method is applied to the three-phase reactor group to reduce the magnetic flux leakage caused by the superposition effect; from another point of view, the paper discusses how to reduce the phase to phase distance of the dry-type air core reactor under the condition of constant electric power value, so as to reduce the floor area of the whole device, and provide another placement scheme when the installation site is insufficient. On this basis, the magnetic field distribution after changing the reactor installation mode and installation height is discussed. It is confirmed that the shielding plate has effect on reactor groups with different installation modes, and the magnetic flux leakage near the ground will be reduced if the column height is properly raised. Finally, the eddy current effect of air core reactor is discussed, and the shielding plate is applied to reduce the adverse effect of eddy current loss.<br>