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1、河南科技大学本科毕业设计（论文）I变压器智能保护电量计量模块的软硬件设计摘 要在电力供配电系统中，配电变压器是将电压直接分配给低压用户的电力设备，数量多且应用普遍。实时地监测配电变压器运行中的各种参数，及时地发现配电变压器运行中出现的异常情况并加以控制和解决，对于电网稳定、优化运行具有十分重要的意义。工作电流、工作电压和变压器油温是决定中小型变压器是否安全运行的三个主要参数，因此，这三个参数的实时监控对保证变压器的安全运行具有很大的作用。电量计量模块就是用来实时检测变压器工况的电压、电流、功率等电量数据，通过一定的控制策略对变压器的过流、超压和欠压的故障状态进行及时处理。本设计中根据变压器智能
2、保护系统保护的组成结构与工作原理，分析了变压器保护的设计目标、功能需求以及性能需求。硬件部分选取 AT89S51 单片机作为系统主控机，采用高精度三相电能专用计量芯片 ATT7026 实时监测电流和电压值，电流、电压检测电路由电流互感器和电压互感器组成。在软件设计中采用可读性和可移植性都较好的 KEILC 语言进行编程，以此实现对单片机及其外围设备的控制，使软件开发的效率和灵活性大大提高。关键词：电力变压器，过流过压保护，单片机，电量检测河南科技大学本科毕业设计（论文）IITHE SOFTWARE AND HARDWARE DESIGN OF POWER MEASUREMENT MODULE
3、IN TRANSFORMERS INTELLIGENCE PROTECTION SYSTEMABSTRACTIn the electric power supply and distribution system, distribution transformer is the power system directly assigning to a users low voltage power,having large quantity and using widely.Real-time monitoring the various parameters of the distribut
4、ion transformer operation, the timely discovery which appears in the operation of the distribution transformer and controlling the abnormal situation of the solution for optimal operation of the power grid stability, has the very vital significance.Working current, working voltage and transformer oi
5、l temperature is three main parameters which decides small and medium sized transformer safely to operate,so real-time monitoring of the three parameters can guarantee the safe operation of the transformer. This module about the electricity metering and power transformer protection, is used for real
6、-time detection of transformer condition of electricity data such as voltage, current, power,and process over-current, over-voltage and under-voltage fault state in a timely manner through some control strategy for transformer.According to intelligent protection system，protection struction and worki
7、ng principle, the design of the transformer analyses the design goals of the transformer protection, functional and performance requirements.The hardware part which selects AT89S51 as the main control machine system uses high-precision three-phase electric energy metering chip ATT7026 real-time moni
8、toring of current and voltage.Current and voltage detection circuit is composed of current transformer and voltage transformer. In the software design it adopts the good readability and portability programming language of KEILC in order to realize the control of the micro-controller and its peripher
9、al 河南科技大学本科毕业设计（论文）IIIequipment, which greatly increases the software development efficiency and flexibility.KEY WORDS：power transformer,over-current and over-voltage protection, single chip microcomputer,power detection河南科技大学本科毕业设计（论文）IV目 录前 言.1第 1 章 变压器智能保护系统.31.1 系统工作原理.31.2 AT89S51 单片机简介.51.2.1
10、特性简介 .51.2.2 管脚定义 .61.3 小节.9第 2 章 电量计量模块硬件设计.102.1 电量计量芯片 ATT7026 介绍.102.1.1 功能简介 .102.1.2 芯片引脚定义 .112.1.3 内部框图介绍 .132.1.4 应用示意图 .142.1.5 系统复位 .152.1.6 相关数值的测量 .162.1.7 接口模块 .192.2 互感器电路设计.202.2.1 电压互感器 .202.2.2 电流互感器 .212.3 复位电路.222.4 +5V 电压设计.232.5 小结.24第 3 章 电量计量软件模块的设计.263.1 软件校表设计.263.1.1 寄存器定义 .263.1.2 参数计算 .
