An electric meter abnormity switching apparatus

Abstract

The embodiment of the invention provides an electric meter abnormity switching apparatus comprising a signal acquiring and comparing unit, a PLC control unit, and a relay control unit. The signal acquiring and comparing unit is connected with an operating table, is used for acquiring the voltage and the loop resistance of the operating table, and respectively compares the voltage and the loop resistance with a set voltage threshold value and a set resistance threshold value in order to generate a level signal, wherein, a high level is outputted if the voltage is over the voltage threshold value or the voltage threshold value is over the set resistance threshold value, otherwise, a low level is outputted. The PLC control unit is connected with the signal acquiring and comparing unit and outputs a PCL control instruction to the relay control unit according to the level signal outputted by the signal acquiring and comparing unit. According to the PCL control instruction, the relay control unit controls the disconnection and the connection of the relay. The electric meter abnormity switching apparatus may automatically or manually cut off the operating table when the operating table breaks down or is required to be powered off in order to ensure uninterrupted power supply of field real devices, thereby enabling real field load operation and important significance to fault hidden trouble discovery of electric meters.

Description

technical field [0001] The invention relates to the field of electric energy meters, in particular to a device for switching abnormality of the electric energy meter hanging meter, specifically a device for automatically or manually disconnecting the running table when the electric energy meter hanging meter is abnormal, so as not to affect the normal use of the load equipment. Electric switching device. Background technique [0002] The reading of the ammeter hanging meter is often the reading of the false load, the load is relatively stable, and the writing table is self-contained. Because the load is relatively stable, it is difficult to trigger the potential failure of the electric meter. For this reason, the actual load is also connected to the writing table. In this way, the digital ammeter is under the action of actual disturbance stress. However, the actual load cannot be switched on or off at will, nor can it affect the voltage amplitude, which puts forward a requi...

AI Technical Summary

Problems solved by technology

[0005] However, although the existing "actual load" movement scheme uses "real load" as the interference source, the simulation of on-site equipment is limited, and some of them are running at no load, so it can only simulate part of the on-site interference stress. The hidden danger of failure may not be stimulated, which is also the defect of simulated load

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