Experimental Study on the Temperature and Humidity Distribution Patterns Inside the DC Wall Bushing

LIANG Jizhong; LI Yanpeng; ZHANG Yu; XU Limeng; LI Junhao

doi:10.13296/j.1001-1609.hva.2026.10.014

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Experimental Study on the Temperature and Humidity Distribution Patterns Inside the DC Wall Bushing

Research & Analysis | 更新时间：2026-10-14

- Experimental Study on the Temperature and Humidity Distribution Patterns Inside the DC Wall Bushing
- High Voltage Apparatus Vol. 62, Issue 10, Pages: 117-122(2026)
- 作者机构：
  
  国网山西省电力公司电力科学研究院，太原 030001
  西安交通大学电气学院，西安 710049
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.10.014
  CLC：
- Received：05 May 2026，
  
  Revised：2026-08-03，
  
  Published：16 October 2026
- 稿件说明：
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LIANG Jizhong, LI Yanpeng, ZHANG Yu, et al. Experimental Study on the Temperature and Humidity Distribution Patterns Inside the DC Wall Bushing[J]. High Voltage Apparatus, 2026, 62(10): 117-122.
DOI：

LIANG Jizhong, LI Yanpeng, ZHANG Yu, et al. Experimental Study on the Temperature and Humidity Distribution Patterns Inside the DC Wall Bushing[J]. High Voltage Apparatus, 2026, 62(10): 117-122. DOI： 10.13296/j.1001-1609.hva.2026.10.014.

摘要

直流穿墙套管是连接换流站与阀厅的关键设备，其户内侧和户外侧处于完全不同的运行环境中，户内侧位于室内保持恒温；户外侧位于自然环境中，冬季环境温度最低可达-30℃，昼夜温差达30℃，而室内外温差最大可至60℃。文中针对这种大温差条件搭建模拟直流穿墙套管运行的实验平台，测量大温差条件下穿墙套管内部温湿度分布。实验结果表明：套管内部温度分布呈现上高下低的趋势，运行过程中套管内部户外侧靠近中下部的点温度最低，相对湿度最高且随着温度的降低而持续升高。套管内部湿度分布与温度呈相反的趋势，降温30 h后相对湿度最高可达66.39%，易产生凝露，降低套管内部绝缘可靠性进而发生闪络故障，影响直流穿墙套管的稳定运行。套管中心导杆不同负载条件下，内部温度分布对湿度的直接影响较小，温度通过影响电容心子内部水分的吸附与释放间接影响湿度的分布。

Abstract

The DC wall bushing is a key device connecting the converter station and the valve hall. Its indoor and outdoor sides are in completely different operating environments. The indoor side is located indoors to maintain a constant temperature.While

the outdoor side is located in a natural environment

the ambient temperature in winter can be as low as-30℃

the temperature difference between day and night can reach 30℃

and the maximum temperature difference between indoor and outdoor can reach 60℃. To address this large temperature difefrence condition

an experimental platform simulating the operation of the DC wall bushing is established to measure the internal temperature and humidity distribution inside the bushing under such conditiosn. The experimental results show that the temperature distribution inside the bushing shows a trend of high at the top and low at the bottom. During operation

the temperature of the point near the middle and lower part of the outdoor side of the bushing is the lowest

and the relative humidity is the highest and continues to increase with the decrease of temperature. The humidity distribution inside the bushing shows an opposite trend to the temperature. The relative humidity can reach up to 66.39%after cooling for 30 h

which is prone to condensation

reduction of insulation reliability inside the bushing and occurrence of flashover failure

affecting the stable operation of the DC bushing. Under different load conditions of the central conductor of the wall bushing

the internal temperature distribution has little direct impact on the humidity. The temperature indirectly affects the humidity distribution by affecting the adsorption and release of moisture inside the capacitor core.

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references

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