Research on Seismic Performance of Current Transformer and Isolation Test
Porcelain column electrical equipment is the most common type of outdoor high-voltage electrical equipment found in substations.However,porcelain-pillar electrical equipment exhibits poor earthquake resistance,which has been a significant factor in the failure of power system functions during past earthquakes.This paper presents findings from a shaking table test conducted on a 110 kV current transformer,comparing the original equipment with one equipped with sliding self-resetting isolation bearings.The study measures acceleration,displacement,and strain responses at key locations of the device under varying seismic intensities and waveforms to analyze the seismic performance and vibration isolation effectiveness of the isolation bearings.The test results indicate that when the peak acceleration reaches 0.4 g,the maximum stress at the base of the current transformer porcelain is 22.4 MPa.The acceleration amplification coefficient for the current transformer ranges between 3 and 8.Notably,the implementation of the sliding self-resetting isolation bearing significantly alters the natural vibration frequency of the current transformer.The acceleration response at the top of the porcelain column is reduced by over 80％,and the strain response at the base of the porcelain casing also experiences a notable decrease.These findings demonstrate that the sliding self-resetting isolation bearing provides an effective isolation mechanism,significantly enhancing the seismic performance of porcelain column electrical equipment.
万方数据
维普
