CN108226848B - An error correction system and method for an electric energy meter - Google Patents

Abstract

The invention discloses an electric energy meter error correction system and method. The system comprises a plurality of bypass devices and a signal generating device, wherein the number of the bypass devices is equal to that of the electric energy meters, and the bypass devices are connected in parallel to two sides of a control switch of the electric energy meters and used for bypassing the control switch and receiving power carrier signals; the signal generating device is arranged at a knife switch of a residential user and used for sending out a specific power carrier signal. The control switch of the electric energy meter is bypassed by the bypass device, so that the normal power supply of a resident user is not influenced during error correction; the bypass device is arranged at the control switch of each electric energy meter, the side wiring of an electric meter box is not required to be changed, and only the signal generating devices are arranged at each household user side one by one, so that the association matching between the electric energy meters and users can be completed, the error correction efficiency is high, and the workload is small.

Description

An error correction system and method for an electric energy meter

technical field

The invention belongs to the field of electric power systems, and in particular relates to an electric energy meter error correction system and method.

Background technique

At present, when the power supply company installs electric energy meters for residential users in a concentrated batch, because there is still a certain distance between the low-voltage electric meter box and each household user, most of the distribution lines are embedded in the building walls and cannot be observed. The possibility that the account number is incorrectly associated with its actual billing account number. Once such a problem occurs, it is easy to cause disputes between power users and power supply companies, and affect the good image of the power supply company's power supply services. In order to avoid this kind of error, the power supply company usually needs to check and confirm the household number and user number of its electric energy meter before the user officially uses electricity.

Power line carrier communication is mainly a communication method that realizes communication by using power line as the medium of communication. Existing problems such as line and power meter matching are all completed by receiving specific signals, that is, a signal transmitter is installed on one side to be detected, and a signal receiver is installed on the other side, and the signal is transmitted through the power line. If the signal receiver receives a specific signal from the signal transmitter, the two parts are properly matched. However, the premise of using this method is that the control switches of all electric energy meters in the electric meter box must be disconnected, that is, the detection must be carried out in a way that all users are powered off, and it is not suitable for power supply occasions that have been operating in an incorrectly associated state for a long time. Moreover, the existing detection methods often require multiple wirings, measurements, and comparisons between the meter box and the user side to achieve final matching, resulting in low error correction efficiency and huge workload.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an electric energy meter error correction system and method, so as to improve the intelligent level and efficiency of electric energy meter installation error correction.

The technical solution for realizing the purpose of the present invention is: an error correction system for an electric energy meter, comprising several bypass devices and a signal generating device, wherein the number of bypass devices is equal to the number of electric energy meters, and two control switches connected in parallel with the electric energy meter are provided. The side is used to bypass the control switch and receive the power carrier signal; the signal generating device is installed at the knife switch of the residential user to send out a specific power carrier signal.

An error correction method for an electric energy meter, comprising the following steps:

Step 1. Connect a bypass device in parallel on both sides of each electric energy meter control switch, disconnect all control switches, close the access switches of all bypass devices, and connect the bypass device in series to the user power supply circuit;

Step 2. Install a signal generating device on the primary side of a user's knife gate, or install a signal generating device on the secondary side of the knife gate, and close the corresponding knife gate;

Step 3, make the signal generating device transmit the power carrier signal, monitor the reception situation of the bypass devices on both sides of each control switch, and obtain the matching relationship between the user and the electric energy meter;

Step 4. Repeat steps 2-3 until the installation and error correction of all user energy meters are completed.

Compared with the prior art, the present invention has the following significant advantages: 1) the present invention bypasses the control switch of the electric energy meter through the bypass device, and does not affect the normal power supply of residential users during error correction; 2) the present invention is used in each A bypass device is installed at the control switch of the electric energy meter, and there is no need to change the wiring on the side of the electric meter box. It is only necessary to install the signal generating device on the side of each household user one by one to complete the correlation between the electric energy meter and the user, with high error correction efficiency and workload. Small.

Description of drawings

Fig. 1 is the overall structure diagram of the system of the present invention.

FIG. 2 is a flow chart of the specific implementation of the system of the present invention.

Detailed ways

The solution of the present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the electric energy meter error correction system includes n bypass devices and a signal generation device, wherein the bypass devices are connected in parallel with the Both sides of the control switch K _i are used for bypassing the control switch K _i and receiving the power carrier signal. The signal generating device is installed at the knife switch D _j of the residential user j (j=1,2,...,n) to send out specific power carrier signal.

The structure of each device will be described in detail below.

The bypass device consists of an isolation transformer, a central processing unit (CPU), a power carrier communication (PLC) module, a human-machine interface (HMI), a relay, a power module and an access switch _Zk . The switch _ZK of the bypass device can be used. Manually disconnecting through the man-machine interface, the received power carrier signal can also be displayed by the HMI. When the control switch K _i is bypassed and the switch Z _K is closed, the isolation transformer circuit of the device 1 is connected in series with the user power supply circuit. The power carrier signal from the user side cannot be transmitted to the primary side (1, 2 side) due to the blocking effect of the transformer, and can only be observed on the secondary side (1, 2 side).

The signal generating device includes a second central processing unit, a second power carrier communication module, a second man-machine interface and a second power supply module. Before sending a letter, the wiring method shown in Figure 1 usually requires closing the user's home switch D _j so that the signal can be transmitted from the user side to the meter box through the distribution line, or the signal generating device is installed at the switch D _j Therefore, the signal output can be completed without closing the switch D _j ; the specific power carrier signal sent in FIG. 2 contains the user number information, and the device 1 can parse the received power carrier signal.

After installing n bypass devices on both sides of K _i , the n energy meter channels are powered by the isolation transformer branch. At this time, on the user side, since only one signal generating device is installed at a time, when the signal generating device is operated to make it When sending a letter, due to the blocking effect of the transformer, only the corresponding branch of the electric energy meter will receive the power carrier signal, and the matching relationship between the electric energy meter and the user can be obtained through the analysis of the bypass device.

The energy meter error correction method, the specific implementation process is shown in Figure 2, including the following steps:

Step 1. A bypass device is connected in parallel on both sides of each electric energy meter control switch K _i (i=1,2,...,n), all control switches K _i are disconnected, and all access switches Z _k of the bypass devices are closed, Connect the bypass device into the user power supply circuit in series;

Step 2. Install a signal generating device on the primary side of the knife gate D _j of a user j (j=1,2,...,n), or install a signal generating device on the secondary side of the knife gate D _j , and close the corresponding knife gate D _j ;

Step 3, make the signal generating device transmit the power carrier signal, monitor the reception situation of the bypass devices on both sides of each control switch K _i , and obtain the matching relationship between the user and the electric energy meter;

Step 4. Install the signal generating device on other user lines one by one, and carry out signal transmission, reception and matching, until the installation and error correction of all user electric energy meters are completed.

Example 2

Embodiment 2 On the basis of Embodiment 1, the modules of the bypass device and the signal generating device are limited. The isolation transformer adopts a double-winding transformer with a transformation ratio of 1:1; the central processing unit adopts the STM32F103RBT6 microcontroller; the power carrier communication module adopts the KQ-130485F 485 to power line carrier module, which is connected with the CPU by 485 bus; The interactive interface adopts Weilun TK6051iP touch screen; the relay adopts JQX-62F 2Z DC12V high-power relay; the power module is powered by 12V battery, and the DC-DC module obtains 5V, 3.3V and other working voltages.

Claims (9)

1. The electric energy meter error correction method is characterized in that an electric energy meter error correction system comprises a plurality of bypass devices and a signal generation device, wherein the number of the bypass devices is equal to that of the electric energy meters, and the bypass devices are connected in parallel to two sides of a control switch of the electric energy meters and used for bypassing the control switch and receiving power carrier signals; the signal generating device is arranged at a knife switch of a resident user and used for sending out a power carrier signal;

the error correction method of the electric energy meter comprises the following steps:

step 1, respectively connecting a bypass device in parallel on two sides of each electric energy meter control switch, disconnecting all the control switches, closing access switches of all the bypass devices, and connecting the bypass devices in a user power supply loop in series;

step 2, installing a signal generating device on the primary side of a certain user disconnecting link, or installing a signal generating device on the secondary side of the disconnecting link, and closing the corresponding disconnecting link;

step 3, enabling the signal generating device to transmit power carrier signals, monitoring the receiving conditions of the bypass devices on the two sides of each control switch, and obtaining the matching relation between the user and the electric energy meter;

and 4, repeating the steps 2-3 until the installation and error correction of all the user electric energy meters are completed.

2. The error correction method for the electric energy meter according to claim 1, wherein the bypass device comprises an isolation transformer, a central processing unit, a power carrier communication module, a man-machine interface, a relay and power supply module and an access switch.

3. The electric energy meter error correction method according to claim 1, wherein the signal generation device comprises a central processing unit, a power carrier communication module, a human-computer interaction interface and a power supply module.

4. The electric energy meter error correction method according to claim 2, wherein the isolation transformer adopts a transformer ratio of 1: 1 double winding transformer.

5. The error correction method for the electric energy meter according to claim 2, characterized in that the relay adopts a JQX-62F2ZDC12V type high-power relay.

6. The electric energy meter error correction method according to claim 2 or 3, characterized in that the central processing unit adopts a microcontroller of STM32F103RBT6 type.

7. The electric energy meter error correction method according to claim 2 or 3, characterized in that the electric power carrier communication module adopts a KQ-130485F 485 power line carrier module, and is connected with the CPU in a 485 bus manner.

8. The error correction method for the electric energy meter according to claim 2 or 3, characterized in that the man-machine interaction interface adopts a Willon TK6051iP type touch screen.

9. The error correction method for the electric energy meter according to claim 1, wherein the power carrier signal transmitted by the signal generating device in step 3 includes user number information.

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