【作者】 傅强；

【导师】 吕泉；

【作者基本信息】 大连理工大学 ， 电气工程（专业学位）， 2020， 硕士

【摘要】 变压器是电力系统重要的组成单元,承担输配电重要任务。变压器故障停运会导致大面积用户停电,造成巨大的经济损失。传统的计划检修方式需要在停运变压器的情况下进行,并且存在检修不及时或者过度检修的问题。本课题设计了一种多信息融合的变压器状态检修系统。该系统基于在线监测技术,综合变压器运行状态监测、变压器工作环境监测以及变压器历史运行负荷监测等各种信息实现对变压器的故障预测,进而合理安排检修计划,避免变压器故障停运。论文分析了目前变压器检修存在的主要问题,研究了在线监测系统基本结构,在需求分析的基础上完成多信息融合的变压器状态检修系统总体设计。将系统分为数据采集单元、数据传输单元和上层监控系统单元三部分。数据采集单元实现对变压器各种运行参数的测量,分别使用电能质量检测模块实现对变压器历史运行负荷以及电能质量信息的实时监测;使用AS3935雷电传感器实现对雷电信息的检测;使用气象传感器实现对变压器运行气象信息监控;采用TNC型直流偏磁传感器实现对铁芯接地电流的采集;选用全球定位系统(GPS)和北斗双模模块实现控制单元的授时与定位功能,保证系统时钟与电力系统时钟一致。数据传输单元实现现场与监控主站的数据传输。选用基于ZigBee的无线传感器,避免了布线工作;设计基于UART转4G透传模块和基于以太网转4G透传模块两种不同的4G无线通信方案。上层监控主站完成数据的计算、分析和处理。通过对系统实现功能的要求以及对不同类型处理器的对比分析,选定基于ARM-based Cortex-M7的STM32F746BE处理器作为核心控制器。最后完成了硬件电路PCB设计、硬件焊接、控制器程序烧写、各通信接口测试。将本文所设计多信息融合的变压器状态检修系统应用于某10kV/380V变压器进行了测试,结果表明:各系统功能基本实现,性能满足设计使用要求。更多还原

【Abstract】 Transformer is an important component unit of power system and undertakes important tasks of transmission and distribution.If the transformer breaks down,it will lead to a large area of power outage,and cause huge economic loss.Traditional scheduled maintenance needs to be carried out when the transformer is out of service.This thesis designs a multi-information fusion system for transformer state maintenance.The system is based on online monitoring technology.It integrates all kinds of information such as transformer operation state monitoring,transformer working environment monitoring and transformer historical operation load monitoring.Then it arrange the maintenance plan to avoid the transformer fault shutdown.This thesis analyzes the main problems of transformer maintenance.It studies the basic structure of on-line monitoring system.On the basis of requirement analysis,it completes the overall design of transformer condition based maintenance system based on multi information fusion.The system is divided into three parts: data acquisition unit,data transmission unit and upper monitoring system unit.The data acquisition unit can measure various operation parameters of transformer.It uses the power quality detection module to realize the real-time monitoring of transformer’s historical operation load and power quality information.It uses AS3935 lightning sensor to detect the lightning information.It uses weather sensors to monitor the weather information of transformer operation.It uses TNC DC magnetic bias sensor to collect the core grounding current.It uses global positioning system(GPS)and Beidou dual-mode module to realize the timing and positioning functions of the control unit to ensure that the system clock is consistent with the power system clock.The data transmission unit realizes the data transmission between the field and the monitoring master station.It selects wireless sensor based on Zigbee to avoid wiring work;designs two different 4G wireless communication schemes based on UART to 4G transparent transmission module and Ethernet to 4G transparent transmission module.The upper monitoring master station completes the data calculation,analysis and processing.It selects STM32F746 BE processor based on ARM-based Cortex-M7 as the core controller.Finally,it completes the hardware circuit PCB design,hardware welding,controller program writing,communication interface testing.The transformer condition based maintenance system designed in this thesis is applied to a 10kV/380 V transformer for testing.The results show that the system functions are basically realized and the performance meets the design.更多还原