地震作用下附建式变电站电气设备动力响应

Dynamic response of electrical equipment in co-construction substation under earthquakes

附建式变电站通常会对电气设备采取隔振措施以减小设备振动及噪声通过结构传播扰民。然而,目前常用的隔振装置系统的自振频率通常位于2~10 Hz之间,与地震动卓越频率相近。因此,这类隔振装置在地震发生时,往往无法发挥隔震效果,反而可能会放大地震的作用,导致采用了隔振措施的电气设备更容易受到损坏。通过有限元模拟的方法,旨在研究不同周期类型的地震动激励下,采用常规隔振方案的电气设备的动力响应。结果表明,采用普通隔振装置后,电气设备所受的竖向地震作用响应相较楼板处有不同程度的放大。这一发现对电气设备的抗震设计提出了重要的警示,需要更加谨慎地考虑隔振装置的选用,以确保设备在地震发生时能够有效地减小振动,降低损坏风险。

Co-construction substations usually adopt vibration isolation measures for electrical equipments to reduce the disturbance caused by equipment vibration and noise through the structure.However,the natural vibration frequency of the vibration isolation system commonly used today is usually between 2~10 Hz,which is close to the excellent frequency of ground motion.Therefore,this type of vibration isolation device in the event of an earthquake,often can not play the effect of isolation,but may amplify the role of the earthquake that the electrical equipments using vibration isolation measures are more vulnerable to damage.In this regard,the finite element simulation method is used to study the dynamic response of electrical equipments using conventional vibration isolation scheme under different period types of ground motion excitation.The preliminary results show that the vertical seismic response of the electrical equipment is amplified in different degrees compared with that of the floor.This finding raises an important warning for the seismic design of electrical equipment,and the selection of vibration isolation devices needs to be considered more carefully to ensure that the equipment can effectively reduce vibration and reduce the risk of damage in the event of an earthquake.