| Failure Analysis of NBR Sealing Ring for Transformer |
| Received:April 15, 2022 Revised:April 19, 2022 |
| DOI：10.12136/j.issn.1000-890X.2023.06.0451 |
| Key Words: NBR；sealing ring；transformer；failure analysis |
| Author Name | Affiliation | E-mail | | YANG Xiaozhi* | State Grid Anhui Electric Power Research Institute | zjhf0522@163.com | | YE Fei | State Grid Anhui Electric Power Co.，Ltd | | | DING Guocheng | State Grid Anhui Electric Power Research Institute | | | LUO Xingzhi | State Grid Anhui Electric Power Co.，Ltd | | | GONG Yangfei | State Grid Anhui Procurement Company | | | FANG Zhenbang | State Grid Anhui Electric Power Research Institute | |
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| Abstract: |
| The failure analysis of the nitrile rubber（NBR） sealing ring of the fire extinguishing valve
body of a power station transformer for oil discharge and nitrogen injection was carried out. The results
showed that in this study，a large number of special-shaped fillers were used in the compounds for the
rubber sealing rings which failed due to cracks，their dispersion was not uniform，and there were large
gaps between the filler and the rubber matrix and obvious phase separation phenomenon，which caused the
cracks in the rubber sealing ring under stress. The corresponding solutions were then put forward，including
material reasonable selection of the rubber sealing ring and strict control production quality according to the
requirements of specific equipment and service environment，assurance of quality the rubber sealing ring in
the equipment installation stage，and installation and replacement of the rubber sealing ring strictly according
to reqirement. |
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