Electric energy meter RS485 communication failure detecting and self-healing device and method

Abstract

The invention discloses an electric energy meter RS485 communication failure detecting and self-healing device and method. The device includes a master RS485 communication circuit, a cascaded RS485 communication circuit and a plurality of slave RS485 communication circuits; the communication input end of the master RS485 communication circuit is connected with an RS485 bus; the signal output end of the master RS485 communication circuit is connected with the signal input end of a master RS485 communication-used MUX electronic switch; the signal input end of the cascaded RS485 communication circuit is connected with the RS485 bus; the signal output end of the cascaded RS485 communication circuit is connected with the signal input end of the master RS485 communication-used MUX electronic switch; the signal input ends of the slave RS485 communication circuits are connected with correspondingly RS485 buses; and the signal output ends of the slave RS485 communication circuits are respectively connected with corresponding slave RS485 communication-used MUX electronic switches. With the electric energy meter RS485 communication failure detecting and self-healing device of the invention adopted, fault self diagnosis, fault location, self isolation and self recovery can be performed on communication links in the RS485 in an intelligent electric energy meter.

Description

technical field [0001] The invention relates to a self-healing device and method for RS485 communication failure detection of an electric energy meter. Background technique [0002] Since 2009, with the large-scale development of my country's smart grid construction work, the smart energy meter used to realize the two-way interactive power consumption mode in the smart grid power service link has begun to be installed on a large scale. In order to realize the two-way interactive power consumption mode reliably and in real time, the communication mode and communication reliability of the smart energy meter have become a bottleneck that seriously restricts the realization of full-coverage two-way interactive power consumption. The existing communication methods of the smart energy meter include: infrared communication, PLC Carrier communication, small wireless communication, RS485 communication. Infrared communication has become an auxiliary communication function because it ...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a self-healing device and method for RS485 communication failure detection and self-healing of electric energy meters in view of the defects existing in the prior art, which solves the problem that has plagued the smart electric energy meter industry for many years. Normal and on-site operation of the system due to a failure of the RS485 communication of a certain electric energy meter, which leads to the paralysis of the communication of the entire system, and it is difficult to troubleshoot the fault on site, and it is impossible to locate the fault type. It is necessary to troubleshoot every node on the RS485 bus to eliminate the fault

The present invention also solves a practical problem in the on-site use of the smart energy meter industry. Due to the single-bus mode, there is a problem that insufficient driving capability affects communication reliability.

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