Seismic Responses and Isolation Analysis of the Neutral Point Protection Device in Offshore Substations

LIAO Wang; JIANG Juan; CHEN Li

doi:10.13296/j.1001-1609.hva.2026.06.021

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Seismic Responses and Isolation Analysis of the Neutral Point Protection Device in Offshore Substations

Research & Analysis | 更新时间：2026-06-10

- Seismic Responses and Isolation Analysis of the Neutral Point Protection Device in Offshore Substations
- High Voltage Apparatus Vol. 62, Issue 6, Pages: 172-178(2026)
- 作者机构：
  
  上海勘测设计研究院有限公司，上海 200335
  大连理工大学水利工程博士后流动站，辽宁大连 116024
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.06.021
  CLC：
- Received：12 December 2025，
  
  Revised：2026-02-29，
  
  Published：16 June 2026
- 稿件说明：
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LIAO Wang, JIANG Juan, CHEN Li. Seismic Responses and Isolation Analysis of the Neutral Point Protection Device in Offshore Substations[J]. High Voltage Apparatus, 2026, 62(6): 172-178.
DOI：

LIAO Wang, JIANG Juan, CHEN Li. Seismic Responses and Isolation Analysis of the Neutral Point Protection Device in Offshore Substations[J]. High Voltage Apparatus, 2026, 62(6): 172-178. DOI： 10.13296/j.1001-1609.hva.2026.06.021.

摘要

风电场海上升压站等海洋平台结构上部组块中设有地震易损性高的支柱类电气设备。为探究此类设备的抗震性能，以国内某海上升压站220 kV主变压器中性点保护装置为对象建立有限元模型，采用时程分析法对其进行地震响应分析。结果显示，上部设备瓷套管根部应力虽符合规范要求，但由于设备安装架钢板刚度较低，导致在地震中隔离开关与安装架钢板的连接处局部应力过大，存在破坏的风险，进而间接造成设备损坏。采用隔震支座对原设备进行底部隔震控制后，可明显减小设备关键位置的应力与加速度响应以及设备安装架的峰值应力，可满足抗震设计要求。

Abstract

Pillar-type electrical equipment with high seismic vulnerability is installed in the upper modules of offshore platform structures such as offshore stations in wind farms.To investigate the seismic performance of such equipment

a finite element model is set up for the neutral point protection device of the 220 kV main transformer in a real offshore substation in China. The seismic responses analysis of the equipment is performed by the time-history analysis method. The results show that although the stress at the root of the porcelain bushing complies with the specification requirement

yet the low rigidity of the steel plate of the equipment mounting frame leads to excessive local stress at the connection between the disconnector and the steel plate in seismic condition

exists the damage risk and causes indirectly the damage of equipment. After applying base isolation control using isolation bearings to the original equipment

the stress and acceleration responses at critical locations of the equipment

as well as the peak stress of the equipment mounting frame

can be significantly reduced

thereby meeting the seismic design requirements.

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references

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