基于线路电阻计算的配电线路运行状态监测方法

Distribution Line Condition Monitoring Method Based on Calculation of Line Resistance With the Real-time Measurement Data

配电线路的正常运行是保证电力系统可靠运行的关键,确定一种经济、有效的配电线路运行状态监测方法,对电力系统的经济性和安全性有着积极重要的意义。目前,主要采用在线监测装置来实现对配电线路和变电设备的运行状态监测,但是其安装和维护费用高,缺乏经济性。在分析现有量测配置的基础上,提出利用实际量测数据来反算线路电阻,并通过分析实时计算得到电阻参数的变化,来实现对线路运行状态的实时监测。与以往的方法相比,该方法可提高用电信息采集系统的利用率,不需额外的设备投资,有经济性和可靠性。实例结果表明,通过分析线路电阻计算值的变化情况可了解线路的运行状态,验证该线路电阻状态监测方法的有效性。

To develop an economic and effective online distribution line condition monitoring method is significant for the economy and security of power system as the normal running of distribution line is critical to ensure the reliability of power system. And at present, the monitoring of operating status of distribution line and transformation equipment can be achieved by using online monitoring devices. However, its installation and maintenance cost a lot, it is poor in economy. A new method, in which line resistance is selected as a reference quantity, is proposed. The monitoring of distribution line running status can be realized by analyzing the line resistance value that calculated from real-time measurement data. The method improves the utilization of information system and requires no additional equipment investment. And the example verifies the validity of the method; it is possible to learn about the operational status in real time through analyzing the changes in line resistance.