A detection method for an external load switch of an electric energy meter

Abstract

The invention relates to a method for detecting the external load switch of an electric energy meter. The method comprises the steps that: (1), the control line and the feedback line of the external load switch are correspondingly connected to a tripping control terminal and a feedback terminal of the electric energy meter; (2), the tripping control terminal outputs a control signal; and the output end of the external load switch correspondingly outputs feedback voltage; (3), the feedback voltage outputs the corresponding feedback level through a feedback signal detection circuit; (4), a feedback signal is detected according to the feedback level; and furthermore, the feedback voltage is judged according to the feedback signal, so that the state of the external load switch is detected; (5), when both the actual state of the external load switch detected by the power and the actual state of the external load switch detected by the feedback voltage are disconnection states, the actual state of the external load switch is the disconnection state; and otherwise, the external load switch is closed; and (6), if the command signal of the external load switch is not the same as the actualstate, abnormal processing on the external load switch is carried out. The accuracy rate of the detection method is relatively high; and the detection method is relatively reasonable and reliable.

Description

technical field [0001] The invention relates to the field of electric energy meters, in particular to a detection method for an external load switch of the electric energy meter. Background technique [0002] The smart energy meter has the functions of remote meter reading, power failure recovery and so on. At present, in China, the smart energy meter is usually used to pull the closing contact to trigger the external load switch, so as to quickly and reliably cut off and connect the user's load current, and implement power failure and recovery. [0003] When the power supply company intends to cut off the power of a certain user due to arrears or other reasons, it can issue an order to switch on the smart energy meter through the marketing business system, power consumption information collection system, or on-site handheld; After the power transmission conditions are met, the power supply company can issue a switch-on command to the smart energy meter through the marketin...

AI Technical Summary

Problems solved by technology

However, there is a problem of misjudgment in this method: 1. After the power supply company sends the switch-on order, the actual smart energy meter fails to switch on, but the user does not use electricity during the detection, which leads to a misjudgment that the switch-on is successful; Closing command, the actual smart energy meter was successfully closed, but the user did not use power during the detection, resulting in a misjudgment that it was not successfully closed

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