Wiring Correctness and Error Detector of Electric Energy Metering Device in Unconnected State

Abstract

The invention relates to a wiring right and wrong detector for an electric energy metering device in the power-off state. The wiring right and wrong detector comprises a power circuit, a pulse generating circuit, an encoding and decoding circuit and an alarm circuit. The pulse generating circuit is used for transmitting a generated pulse control signal and a generated synchronous detection pulse signal to the encoding and decoding circuit and the alarm circuit respectively. The encoding and decoding circuit is used for sequentially outputting detection signals to the wiring detection input end of the electric energy metering device when the pulse control signal is triggered. The alarm circuit is used for correspondingly collecting signals of the wiring detection input end and the wiring detection output end of the electric energy metering device and conducting comparison when the synchronous detection pulse signal is triggered, judging whether the signals of the wiring detection input end and the wiring detection output end of the electric energy metering device are the same or not, giving an alarm, outputting an alarm signal to the encoding and decoding circuit and controlling the working state of the encoding and decoding circuit. According to the wiring right and wrong detector for the electric energy metering device in the power-off state, wiring of the electric energy metering device in the power-off mode or without loads can be detected.

Description

technical field [0001] The invention relates to the technical field of electric detection, in particular to a correct and incorrect connection detector for an electric energy metering device in a non-energized state. Background technique [0002] The correct wiring of the electric energy metering device is a necessary condition to ensure the accuracy of electric energy metering. With the continuous updating of new meters and new measuring methods, electricity stealing methods are also developing towards a more concealed and more technological trend. Therefore, it is particularly important to ensure the accuracy of electric energy metering and devices. At the same time, due to the replacement of old and new installers, newcomers often cause wiring errors due to poor technology or carelessness. However, there are many types of wrong wiring of electric energy meters. For example, there are 287 kinds of common wrong wirings of three-phase three-components, and 575 kinds of comm...

AI Technical Summary

Problems solved by technology

[0005] ① Use instruments and meters: volt-ampere phase meter, field calibrator of electric energy meter or some smart electric energy meter calibrator and electric energy measurement fault error detector, etc.; the premise of using this method is that the site has been powered and has a certain load, The technical requirements for installers are relatively high, so most installers do not use instruments to measure

For a very small number of installers, they may use a meter to measure whether there is voltage and current, but they will not judge whether there are problems such as reverse polarity and phase sequence mismatch.

[0006] ② Use the light to connect the wires: use the light to connect the wires, you can determine the continuity of the wires, but you can’t judge the polarity, and it is time-consuming and laborious, and requires a high technical level of personnel;

Second: troublesome and time-consuming

Third: The detection is not comprehensive, such as the polarity of the transformer cannot be determined, and the incoming and outgoing lines of the current loop cannot be distinguished, etc.

Fourth: The result is accurate only through the instrument test, but the premise of the instrument test is that it has been powered on and has a load, otherwise, it cannot be measured accurately

Therefore, it is not possible to use the meter to perform wiring inspection without power on and without load

Fifth: Since there is a strong current on the wiring detection terminal of the electric energy metering device, the danger is increased and it is easy to cause personal safety.

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