Acquisition and control module for multi-user prepaid watt-hour meter and method

Abstract

The invention relates to an acquisition and control module for a multi-user prepaid watt-hour meter, which comprises a circuit board, a magnetic latching relay, a current transformer, metering chips,a memory chip, a first socket and a second socket, wherein the magnetic latching relay is provided with a first connection bar and a second connection bar; the first connection bar is provided with afirst needle-shaped raised pin; the second connection bar is provided with a second needle-shaped raised pin; a connection soft wire passes through the current transformer to be welded with the secondconnection bar; the current transformer is clamped in a hole in the circuit board; and the magnetic latching relay is welded with the circuit board through the first needle-shaped raised pin and thesecond needle-shaped raised pin. One-path three-phase or three-path single-phase electric parameter measurement and prepaid power cut and transmission functions can be realized; acquisition of each path of current and voltage signals is processed by an independent metering chip, and in comparison with a single metering chip scheme, real-time and real electrical parameters are measured, and the measurement accuracy is higher and more reliable.

Description

technical field [0001] The invention relates to the technical field of electric power meters, in particular to a collection control module and method for a multi-user prepaid electric energy meter. Background technique [0002] At present, most centralized multi-user electric energy meters adopt a centralized measurement scheme of a metering chip. See patents 201320720089.X and 201520072912.X, both of which use logic chips (electronic switches) to switch multiple user current signals, then output them in a single channel, and transmit them to the metering chip design schemes, relying on software optimization to ensure metering accuracy. Instruments using this scheme have the following drawbacks: [0003] 1. From the perspective of measurement accuracy, the meter is not the real electricity consumption data for measurement. When the electronic switch is switched to the current user, the current data of other users cannot be collected and is in an unknown state. The current ...

AI Technical Summary

Problems solved by technology

When the electronic switch is switched to the current user, the current data of other users cannot be collected and is in an unknown state. The current data during this period can only be optimized and processed according to the data measured last time. If the current data changes during this period, the instrument will Undetectable, resulting in inaccurate measurement

[0004] 2. From a structural point of view, the layout is complicated, the production efficiency is not high, and the labor cost is increased at the same time

The single metering chip solution will inevitably lead to the separate design of the current signal acquisition board and the metering chip circuit board, and the interconnection and installation will increase the difficulty of structural design

[0005] 3. In terms of reliability, the current sampling needs to be collected to the circuit board equipped with the metering chip through a lot of long leads or through the pin socket of the circuit board. The long leads, the large number, and the connection between the circuit boards will increase the unreliability of the instrument. sex factor

[0006] 4. From the perspective of after-sales maintenance, the maintainability is poor

The single metering chip solution only detects the bus voltage, but cannot monitor the voltage of each user branch, and the owner cannot intuitively know the current power consumption status of each branch

If a user is in arrears, the current magnetic latching relay should be in the off state, but because the magnetic latching relay is faulty, the contacts are stuck, and the power cannot be cut off. The user can continue to use electricity normally, and the owner cannot be informed in time, which is economical. interests cannot be guaranteed

If in this case, the owner thinks that the power has been cut off, and it will be life-threatening to carry out maintenance operations.

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