摘要:
采集实际寿命周期中矿山电力变压器及普通电力变压器的围屏纸板制作绝缘试品，利用黏度测试仪、扫描电镜测试手段，并根据电力标准，对比分析了矿山电力变压器与普通电力变压器绝缘纸的聚合度、表面形貌等微观结构及局部放电、电气强度等电气性能，探讨了老化过程中微观结构变化对电气性能的影响。分析结果表明：老化过程中绝缘缺陷在绝缘纸中逐渐形成并扩大，相较普通电力变压器绝缘纸，矿山电力变压器绝缘纸的表面形貌变化更加明显，形成的缺陷也更加显著；在老化过程中，普通电力变压器和矿山电力变压器绝缘纸的聚合度均呈现逐渐下降趋势，但矿山电力变压器绝缘纸聚合度的下降速度更快；矿区运行环境是造成矿山电力变压器绝缘纸较普通电力变压器老化严重的主要原因。在运行过程中，矿山电力变压器绝缘纸较普通电力变压器将产生更大的放电量及更多的放电次数，放电相位也更宽；在老化过程中，普通电力变压器和矿山电力变压器绝缘纸的电气强度均呈现逐渐下降趋势，但矿山电力变压器绝缘纸的电气强度低于普通电力变压器；矿山电力变压器绝缘纸微观结构缺陷是导致其电气性能变化更加显著的直接原因。在电力设备状态监测维修过程中，对矿山电力变压器绝缘状态的监测建议从严执行电力标准，电气特征参数更适合用于矿山电力变压器绝缘状态监测及故障诊断。
Abstract:
Collect screen paperboard of mine power transformer and ordinary power transformer in practical lifetime cycle to make insulation test samples, and according to the standard of power, use test means such as viscosity tester, scanning electron microscopy to compare and analyze microstructures of insulation paper such as polymerization degree, surface morphology of mine power transformer and ordinary power transformer, as well as electrical properties such as partial discharge and electrical strength; at the same time, effect of microstructure changes on electrical performances during aging was discussed. The analysis results show that the insulation defects gradually form and expand in the insulation paper during the aging process; compared with the insulation paper of ordinary power transformers, the surface morphology changes of the insulation paper of mine power transformers are more obvious, and the formed defects are more significant.In the aging process, the polymerization degree of insulation paper of ordinary power transformer and mine power transformer presents a gradual decline trend, but the decline speed of polymerization degree of mine power transformer insulation paper is faster.The operating environment of mining area is the main reason that the aging of insulation paper of mine power transformer is more serious than that of ordinary power transformer.In the process of operation, the insulation paper of mine power transformer will produce more discharge quantity, more discharge times and wider discharge phase than ordinary power transformer.In the aging process, the electrical strength of insulation paper of both ordinary power transformer and mine power transformer decreases gradually, but the electrical strength of insulation paper of mine power transformer is lower than that of ordinary power transformer.The microstructural defects of insulation paper of mine power transformers are the direct causes of the more significant changes in their electrical properties.In the process of state monitoring and maintenance of power equipment, it is suggested that the insulation state monitoring of mine power transformers should be carried out strictly according to the power standards,electrical property parameters are more suitable for insulation status monitoring and fault diagnosis of mine power transformer.
百度学术
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