Research on Insulation Characteristics of Disconnector Module in Solid Insulated Switchgear Cabinet

HUANG Zeping; CHEN Li'an; WANG Hongyan; XIANG Xin; ZHENG Wenfu; JIANG Yongxin

doi:10.13296/j.1001-1609.hva.2025.12.006

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Research on Insulation Characteristics of Disconnector Module in Solid Insulated Switchgear Cabinet

Research & Analysis | 更新时间：2025-12-09

- Research on Insulation Characteristics of Disconnector Module in Solid Insulated Switchgear Cabinet
- High Voltage Apparatus Vol. 61, Issue 12, Pages: 42-49(2025)
- 作者机构：
  
  厦门理工学院电气工程与自动化学院，福建厦门 361024
  厦门市高端电力装备及智能控制重点实验室，福建厦门 361024
  爱启（厦门）电气技术有限公司，福建厦门 361006
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2025.12.006
  CLC：
- Received：17 June 2025，
  
  Revised：2025-09-18，
  
  Published：16 December 2025
- 稿件说明：
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HUANG Zeping, CHEN Li'an, WANG Hongyan, et al. Research on Insulation Characteristics of Disconnector Module in Solid Insulated Switchgear Cabinet[J]. High Voltage Apparatus, 2025, 61(12): 42-49.
DOI：

HUANG Zeping, CHEN Li'an, WANG Hongyan, et al. Research on Insulation Characteristics of Disconnector Module in Solid Insulated Switchgear Cabinet[J]. High Voltage Apparatus, 2025, 61(12): 42-49. DOI： 10.13296/j.1001-1609.hva.2025.12.006.

摘要

在固体绝缘开关柜的研发过程中，高绝缘水平的优化设计是其安全可靠运行的保障。文中设计了一种适用于固体绝缘开关柜的隔离开关模块，并通过试验验证了其在75 kV（合闸）、85 kV（断口）雷电冲击电压下的绝缘性能，满足国家标准要求；但当雷电冲击电压等级提高到西班牙、澳大利亚等地区标准要求的95 kV时，型腔内接地端部处发生沿面放电。采用有限元软件对其进行电场仿真与分析，由仿真结果得知型腔内接地端部空气场强发生畸变，原因在于屏蔽罩与环氧内层的绝缘距离不足，造成气固交界面的空气场强超过临界值，引发沿面放电。在明确了问题所在之后，通过分析不同屏蔽罩半径、不同环氧层内径对型腔内空气场强的影响规律，提出增加屏蔽罩半径或减小环氧层内径两种方案以降低气固交界面电场强度，并通过仿真验证。仿真结果表明：在两种优化方案下，隔离开关模块接地端部空气场强分布更加均匀，峰值明显降低且均小于临界击穿场强，符合西班牙、澳大利亚等地区的绝缘要求。

Abstract

The optimized design of high insulation level in the development of solid insulated switchgear cabinet is the assurance of its safe and reliable operation. In this paper a disconnector module suitable for solid insulated switchgear cabinet is designed

and its insulation performance at 75 kV（closing）and 85 kV (across open contacts) lightning impulse voltage is verified through tests

which meets the requirements of China national standards. However

when the lightning impulse voltage level is increased to 95 kV as required by such countries and regions as Span and Austrila

the surface discharge occurs at the grounding end of the cavity. Its electric field is simulated and analyzed by finite element software

and the simulation results reveal that the air field strength at the ground end of the cavity is distorted. The reason is that the insulation distance between the shield and the epoxy inner layer is insufficient

causing air field strength at the gas-solid interface to exceed the critical value and resulting in surface discharge. After the confirmation of the reason of the problem adn also analysis of the influence of different shield radius and different inner diamater of epoxy layer on the air field strength in the cavity

such two schemes as increase of shield radius or decrease of inner diameter of the epoxy layer are proposed so to decrease the electric field strength of the gas-solid interface

and are verified by simulation. The simulation results show that the air field strength at the grounding end of the disconnector module is significantly even under the two optimization schemes

the peak is obviously reduced and is less than the critical breakdown field strength

which meets the insulation requirements in such countries and regions as Spain and Australia.

关键词

Keywords

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