On-Line Monitoring System of Surge Arrester Realizing Synchronous Sampling in rs485 Communication

Abstract

The invention provides an online monitoring system for lightning arresters that realizes synchronous sampling in RS485 communication, including a host and multiple slaves. The slaves are used to monitor electrical signals on multiple lightning arresters respectively. Carry out analysis and calculation to obtain the relevant parameters of the arrester. The host computer and each slave computer are connected through the RS485 interface. The synchronous signal line between the machines is used for the master to control the sampling time of each slave to realize synchronous sampling, and the configuration of the communication baud rate when used as the RS485 communication connection line is opposite to the synchronous sampling when used as the RS485 synchronous signal line Controls have no effect. The system provided by the present invention not only realizes the communication between the master and the slave, but also realizes the synchronous sampling between the master and the slave by setting one RS485, and the synchronization accuracy is high.

Description

technical field [0001] The invention relates to the technical field of communication applications, and more specifically, relates to an on-line monitoring system for lightning arresters based on RS485 communication to realize synchronous sampling. Background technique [0002] The lightning arrester online monitoring system consists of a host and multiple slaves. Multiple arresters share a voltage signal. Usually, the host monitors the voltage signal on the arrester, and the monitor acts as a slave to simultaneously detect the current signals of multiple arresters. The small deviation of the phase between the voltage signal and the current signal and between multiple current signals has a great influence on the calculation results of multiple main parameters, and has a great influence on the judgment of the performance of the arrester, so the voltage signal The monitoring of multiple current signals should be strictly synchronized, that is, the simultaneous sampling of all ...

AI Technical Summary

Problems solved by technology

[0004] Such two RS485 signal lines increase the cable cost and labor cost

And when the communication command is used to control the synchronous sampling, the sampling is started after the sampling command is analyzed and processed, and the command analysis process will cause the time deviation of the synchronous sampling to be too large due to the different hardware and software running parts of each slave.

In addition, the two RS485 signal lines mean that the MCU in the master and the slave must have two UART interfaces, the selection range of the MCU becomes smaller, and the cost increases

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