Abstract

The long-term safe and stable operation of oil-impregnated paper (OIP) bushings is of great significance to the operation of power systems. With the growth of OIP bushing, its internal insulation will gradually decay. Aramid insulation paper has excellent thermal aging characteristics and its insulation performance can be improved by using nano-modification technology. In this paper, the nano-SiO2 particles were used as the modified additives, and the modified aramid insulation paper was prepared through four steps: ultrasonic stirring, fiber dissociation, paper sample copying and superheated calendering. The microscopic physical morphology and chemical components of the insulation specimens before and after modification were analyzed by atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), and an OIP bushing model based on the modified aramid insulation paper was constructed and its electric field distribution was analyzed. The simulation results show that the use of SiO2-modified aramid insulation paper can improve the electric field distribution of OIP bushings and increase the operating life of power transformers.

Highlights

  • As an important part of power transformers, oil-impregnated paper (OIP) bushings assume the important roles of leading out the high and low voltage leads of power transformers, fixing the internal lead structure, and achieving insulation between the leads and the transformer tank [1]

  • OIP bushings for power transformers usually adopt a structure of multi-layer metal laminations, while the oil-impregnated paper insulation is widely used inside power transformers due to its high thermal stability

  • X-ray photoelectron spectroscopy (XPS) tests were performed on aramid insulation paper samples treated with nanoXPS were tests were performed on aramid insulation samples treated with nanoXPS tests performed on aramid insulation paperpaper samples treated with nanomodification technology, and the results are shown in

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Summary

Introduction

As an important part of power transformers, oil-impregnated paper (OIP) bushings assume the important roles of leading out the high and low voltage leads of power transformers, fixing the internal lead structure, and achieving insulation between the leads and the transformer tank [1]. In the field of using nanoparticles to improve the electrical properties of traditional insulating paper, scholars have tried to modify insulating paper by adding nano-SiO2 , nano-Al2 O3 , nano-TiO2 , nano-MgO, and nano-ZnO particles, and the performance of these nanoparticles can be different. The nano-SiO2 particles can reduce the dielectric constant of insulating paper, and at a content of 5%, the dielectric constant is 34% lower than that before modification [12]; the thermal conductivity of insulating paper increases with the addition of nano-Al2 O3 compared with the previous one [13,14]; the addition of nano-TiO2 increases the frequency breakdown voltage of insulating paper [15]; nano-MgO modified insulating paper has better anti-aging performance [19]; nano-ZnO has better suppressive effect on space charge of insulating paper [19]. An OIP bushing model was developed in Comsol to analyze the effect of modified aramid insulating paper on the actual electric field distribution of power transformers

Material Preparation
TestInMethods
Physical
Modified
Sample
Test Results
Dielectric Constant Test Results
Finite
Finite Element Simulation Theory
Parameters and of Finite
Simulation
11. Voltage
The of aramid insulation can be effectively stripped by nano-2
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