变压器储存、运输状态下绝缘可靠性关键技术研究

发布时间：2018-12-11 05:52

【摘要】：随着特高压输电工程的大规模建设,大型电力变压器类设备的运输及存储问题日益突出。变压器在工厂生产完毕后,由于运输重量等原因,一般会选择充气运输,尤其是特高压变压器,器身在充气状态下储运时间相对较长,绝缘性能易受充入气体的露点、环境温度、环境湿度等因素的影响,在实际工程建设中曾经出现过充气储运的特高压变压器器身受潮的情况。对于部分出口变压器,由于运输路途较远,运输过程中难免出现突发情况,各变压器企业基本是采取现场补救措施,补救后变压器也可以满足现场交接试验和长期安全运行的要求,因此变压器存储、运输标准值的安全余量较大,存在优化和改进的空间。长期以来,国内外变压器制造企业,均是严格执行此运输标准和要求,未对此标准和要求的相关数值进行实验和验证分析。运输冲击是变压器在运输过程中经常遇到的问题。大的冲击加速度会造成变压器内部绝缘材料、线圈、铁心等部件的移位和松动。目前,3g冲击加速度是大型变压器运输冲击控制的考核标准,但是此数据的有效性无法得到准确的验证,对不同加速度下器身所受冲击需要进一步深入验证研究。随着变压器电压等级和容量的不断增加,其运输重量越来越大,冲击加速度对变压器运输的影响更加明显。加速度仿真和陆运实验,首先根据变压器结构,利用仿真技术确定不同加速度条件下的位移和应变严重区域。利用变压器实物,在相关区域安装传感器,利用运输车辆和路障,实现变压器陆运实验,确定了不同加速度条件下相关位置的位移和形变情况,最终得出变压器可承受的最大加速度值。本研究通过研究储运过程中环境温、湿度对充入气体的影响,充入气体露点对产品绝缘性能的影响等,最终确定充入气体压力、露点的临界值,为变压器的存储、运输提供依据。通过研究运输加速度对器身绝缘性能的影响,确定变压器可承受的运输加速度的最大值,用于限制运输车间的行驶,保证运输可靠。本成果在特高压及常规输电工程建设中具有十分良好的工程应用前景,对保障储运质量、降低储运风险具有较大作用,具有较大的社会、经济效益。
[Abstract]:With the large-scale construction of UHV transmission projects, the transportation and storage problems of large power transformers are becoming increasingly prominent. After the production of the transformer in the factory, due to the transportation weight and other reasons, it is generally chosen to inflate transportation, especially the UHV transformer. The storage and transportation time of the transformer is relatively long in the inflatable state, and the insulation performance is easy to be filled with the dew point of the gas. The influence of environmental temperature, environmental humidity and other factors, in the actual engineering construction has occurred in the case of aerated storage and transportation of UHV transformer body dampness. For some export transformers, because the transportation is far away, it is inevitable that unexpected situations will occur in the course of transportation. The transformer enterprises basically take on-site remedial measures. After remediation the transformer can also meet the requirements of site transition test and long-term safe operation. Therefore the storage of transformer the safety margin of transportation standard value is large and there is room for optimization and improvement. For a long time, transformer manufacturers at home and abroad have strictly carried out the transport standards and requirements, and have not carried out experiments and verification analysis on the relevant values of the standards and requirements. Transportation shock is a problem often encountered by transformers in the course of transportation. Large impact acceleration will cause internal insulation materials, coils, iron core and other parts of the displacement and loosening. At present, 3G impact acceleration is the assessment standard of large transformer transportation impact control, but the validity of this data can not be verified accurately. With the increasing of transformer voltage and capacity, the weight of transformer is increasing, and the impact of impact acceleration on transformer transportation is more obvious. In acceleration simulation and ground transportation experiment, firstly, according to transformer structure, the displacement and strain serious area under different acceleration conditions are determined by simulation technology. Using transformer physical object, installing sensor in relevant area, utilizing transportation vehicle and roadblock, realizing transformer ground transportation experiment, the displacement and deformation of relevant position under different acceleration conditions are determined. Finally, the maximum acceleration value of transformer can be obtained. By studying the influence of environment temperature and humidity on the filling gas and the effect of the gas dew point on the insulation performance of the product during the storage and transportation process, the critical value of the filling gas pressure and dew point is determined, which is the storage of the transformer. Provide the basis for transportation. By studying the influence of the transportation acceleration on the insulation performance of the transformer, the maximum value of the transportable acceleration of the transformer is determined, which can be used to limit the running of the transporter and ensure the reliability of the transportation. This result has a very good prospect of engineering application in the construction of UHV and conventional transmission projects. It plays a great role in ensuring the quality of storage and transportation and reducing the risk of storage and transportation. It has great social and economic benefits.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM41

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