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

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，其运行的稳定性直接关系着电力系统中输送电能的质量。电抗器运行过程中产生的电动力可能会造成包封绝缘的开裂，进而引起电抗器的损坏，而造成绝缘开裂的原因主要有两个：漏磁通产生的电动力过大引起强度破坏；漏磁通产生交变电动力导致疲劳破坏。工程上只规定了绝缘材料抗拉强度限值，对疲劳破坏研究不够。本文通过Maxwell仿真验证了正常运行过程中，即使漏磁产生的电动力满足材料抗拉强度要求，疲劳破坏的应变余量并不满足，因此，应做好漏磁屏蔽工作。<br>本文拟就空心电抗器产生漏磁引起应力变化对本体造成损害，根据电动力公式可知电动力正比于磁感应强度，将电流设置为电抗器所能承受的最大过电流即额定电流1.35倍，尺寸已知的情况下，经磁场仿真得到漏磁值，最终计算得出电动力值，证实在干式空心电抗器相间距为1.7D情况下电动力在其能承受范围内并且有足够余量。但是疲劳应力一般为抗拉强度的2%，虽满足要求但是余量很小，且在导线经过10^6次循环周期后会出现疲劳破坏，因此，长期运行后很容易发生疲劳破坏事故。<br>在已有磁场屏蔽理论基础上，本文提出一种新的漏磁屏蔽方法，从减小漏磁入手对空心电抗器进行仿真分析，通过对内屏蔽板各项参数对比得到最优化参数，最终降低漏磁使得其疲劳应力降低，增加电抗器安全性。<br>在电抗器自身漏磁减小的前提下，将屏蔽方法应用到三相电抗器组中，降低因叠加效应变大的漏磁；从另一个角度出发讨论电动力值不变情况下缩近干式空心电抗器相间距，进而减小整个装置的占地面积，为安装场地不足时提供另一种安置方案。并且在此基础上讨论改变电抗器安装方式、安装高度后磁场分布情况，证实屏蔽板对不同安装方式的电抗器组均有效果，且适当升高支柱高度靠近地面的漏磁会有所减少。最后对空心电抗器涡流影响进行了讨论，将屏蔽板应用到涡流屏蔽中减小涡流损耗带来的不良影响。

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，其运行的稳定性直接关系着电力系统中输送电能的质量。 电抗器运行过程中产生的电动力可能会造成包封绝缘的开裂，进而引起电抗器的损坏，而造成绝缘开裂的原因主要有两个：漏磁通产生的电动力过大引起强度破坏；漏磁通产生交变电动力导致疲劳破坏。 工程上只规定了绝缘材料抗拉强度限值，对疲劳破坏研究不够。 本文通过Maxwell仿真验证了正常运行过程中，即使漏磁产生的电动力满足材料抗拉强度要求，疲劳破坏的应变余量并不满足，因此，应做好漏磁屏蔽工作。<br>本文拟就空心电抗器产生漏磁引起应力变化对本体造成损害，根据电动力公式可知电动力正比于磁感应强度，将电流设置为电抗器所能承受的最大过电流即额定电流1.35倍，尺寸已知的情况下，经磁场仿真得到漏磁值，最终计算得出电动力值，证实在干式空心电抗器相间距为1.7D情况下电动力在其能承受范围内并且有足够余量。 但是疲劳应力一般为抗拉强度的2%，虽满足要求但是余量很小，且在导线经过10^6次循环周期后会出现疲劳破坏，因此，长期运行后很容易发生疲劳破坏事故。<br>在已有磁场屏蔽理论基础上，本文提出一种新的漏磁屏蔽方法，从减小漏磁入手对空心电抗器进行仿真分析，通过对内屏蔽板各项参数对比得到最优化参数，最终降低漏磁使得其疲劳应力降低，增加电抗器安全性。<br>在电抗器自身漏磁减小的前提下，将屏蔽方法应用到三相电抗器组中，降低因叠加效应变大的漏磁；从另一个角度出发讨论电动力值不变情况下缩近干式空心电抗器相间距，进而减小整个装置的占地面积，为安装场地不足时提供另一种安置方案。 并且在此基础上讨论改变电抗器安装方式、安装高度后磁场分布情况，证实屏蔽板对不同安装方式的电抗器组均有效果，且适当升高支柱高度靠近地面的漏磁会有所减少。 最后对空心电抗器涡流影响进行了讨论，将屏蔽板应用到涡流屏蔽中减小涡流损耗带来的不良影响。

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>