A live meter changing simulation device based on a smart meter

Abstract

The application relates to the field of simulation training of the electric power industry, in particular to a live meter changing simulation device based on a smart meter, which comprises an acquisition circuit, a control circuit, an upper computer, an electric energy meter, a switching circuit, a virtual load power supply, a voltage loss instrument and a junction box, wherein the virtual load power supply is connected with the junction box, the junction box is connected with the voltage loss instrument, the electric energy meter is connected with a primary circuit of the switching circuit, the switching circuit has two working states, the primary circuit of the switching circuit is connected with the junction box or the acquisition circuit, the control circuit is connected with a secondary circuit of the switching circuit, and the control circuit is used for controlling the switching circuit to switch the working state, wherein the upper computer is communicatively connected with the acquisition circuit, the control circuit, the electric energy meter, the virtual load power supply and the voltage loss instrument. The application can switch the state and is communicatively connected with a PC computer, a PLC, the electric energy meter, the virtual load power supply and the voltage loss instrument, so that all operation processes can be automatically recorded in the process of live meter changing.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of simulation training in the power industry, in particular to a live meter replacement simulation device based on a smart meter. BACKGROUND

[0002] A smart meter is an advanced metering device based on modern communication technology, computer technology and measurement technology, which collects, analyzes and manages electric energy information data. The basic principle of a smart meter is to rely on an A / D sampling device or a metering chip to collect user current and voltage in real time, analyze and process the data through a processor to calculate forward and reverse, peak and valley or four-quadrant electric energy, and further output the electric quantity and other content through communication and display.

[0003] An electric energy meter needs to be replaced when it enters a replacement cycle, the configuration does not meet the requirements, the outgoing metering accuracy or function fails. In order to not affect the normal production and life of users, the electric energy meter is replaced live. However, in actual application, the live replacement of the electric energy meter itself has certain risks, which requires related personnel to have high live meter replacement skill level.

[0004] An electric energy meter is connected to a power source through a terminal box, and the meter replacement is completed by switching the terminal box, short-circuiting the current and disconnecting the voltage. However, in this case, when the disconnection sequence is incorrect or the terminal box short-circuiting is incorrect, the operation process cannot be automatically recorded, and the operator cannot be automatically judged whether the operation is standardized. Therefore, a simulation system capable of automatically recording the operation process is needed. SUMMARY

[0005] The present application adds a PLC switching device to automatically complete the switching of normal loops and signal loops, and a voltage loss instrument is further added in the normal loop to collect loop data and determine the loop state. The specific technical scheme is as follows:

[0006] A live meter replacement simulation device based on a smart meter includes an acquisition circuit, a control circuit, an upper computer, an electric energy meter, a switching loop, a virtual load power supply, a voltage loss instrument and a terminal box. The virtual load power supply is connected to the terminal box, the terminal box is connected to the voltage loss instrument, the electric energy meter is connected to the primary loop of the switching loop, the switching loop has two working states, the primary loop of the switching loop is connected to the terminal box or the acquisition circuit, the control circuit is connected to the secondary loop of the switching loop to control the switching of the switching loop, and the upper computer is connected to the acquisition circuit, the control circuit, the electric energy meter, the virtual load power supply and the voltage loss instrument.

[0007] Further, the upper computer is a PC computer.

[0008] Further, the acquisition circuit and the control circuit are composed of PLC, wherein the connection mode of the primary circuit of the switching circuit and the acquisition circuit is that the current loop from the electric energy meter is directly connected to the input signal of the PLC, and the voltage loop from the electric energy meter is connected to the PLC analog quantity after being converted into 0-5V voltage signal through resistance voltage division; the connection mode of the secondary circuit of the control circuit and the switching circuit is that the output relay of the PLC is connected to the secondary circuit of the switching circuit.

[0009] Further, the opening and closing position sensor is installed on the terminal box, and the signal of the opening and closing position sensor is connected to the acquisition circuit.

[0010] Further, the opening and closing position sensor is a magnetic control switch.

[0011] Further, the switching circuit is a switching relay.

[0012] Further, the communication connection between the host computer and the acquisition circuit, the control circuit, the electric energy meter, the virtual load power supply and the voltage loss instrument is 485 communication connection.

[0013] The present application has the following advantages:

[0014] The present application can switch the state and communicate with the PLC, the electric energy meter, the virtual load power supply and the voltage loss instrument through the PC computer, so that all the operation processes can be automatically recorded during the live meter replacement. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The present application is a module block diagram.

[0016] Figure 2 The present application is a wiring diagram. DETAILED DESCRIPTION

[0017] The present system comprises a signal acquisition circuit, a control circuit, a host computer, an electric energy meter, a switching circuit, a virtual load power supply, a voltage loss instrument and a terminal box.

[0018] The acquisition circuit is used for acquiring signals, and the control circuit is used for controlling the switching state of the switching circuit; in the present embodiment, the acquisition circuit and the control circuit are composed of PLC.

[0019] In the present embodiment, the host computer is a PC computer.

[0020] Figure 2For the wiring diagram of the present application, the voltage loss instrument is used to simulate the load in the field operation, the virtual load power supply supplies power for the voltage loss instrument through the junction box, and the voltage loss instrument is externally connected with an auxiliary power supply, and the communication can still be normally operated when the three-phase voltage is lost. The electric energy meter is connected with the junction box, and is used to simulate the electric meter in the field operation. The connection between the electric energy meter, the junction box, the virtual load power supply and the voltage loss instrument is consistent with that in the normal operation in the field, and at this time, the normal loop state is formed.

[0021] The switching loop is added between the electric energy meter and the junction box, the connection between the electric energy meter and the junction box can be disconnected through the switching loop, the electric energy meter is connected with the PLC, the signal of the electric energy meter is collected by the PLC, and at this time, the collection loop state is formed. The switching loop is specifically a switching relay, and the switching relay is controlled by the output relay of the PLC. The connection between the electric energy meter and the PLC is that the current loop connection is directly collected by the PLC input signal, and the voltage loop needs to pass through resistance voltage division and be converted into a 0-5V voltage signal which is collected by the PLC analog quantity.

[0022] The magnetic control switch is also mounted on the junction box, the signal of the magnetic control switch is connected to the PLC, and the opening and closing signals of the junction box can be transmitted to the PLC.

[0023] The PC computer is connected with the PLC, the electric energy meter, the virtual load power supply and the voltage loss instrument in 485 communication.

[0024] As shown in Figure 1 the module block diagram of the present application, the switching loop is formed between the electric energy meter and the junction box, the command is sent to the PLC by the PC computer, the PLC controls the switching operation of the switching loop, the switching between the normal loop and the collection loop is completed, when the normal loop is switched, the voltage loss instrument is connected in series to the loop, and the voltage is connected in parallel to the loop, the real-time collection of the loop voltage and current data is realized, the data is transmitted to the PC computer through 485, and the PC computer judges whether the connection is correct according to the voltage and current data. For example, when the UA voltage is 0, it is obvious that the voltage line is connected in error. When the collection loop is switched, the current loop connection of the electric energy meter is directly collected by the PLC input signal, the voltage loop needs to pass through resistance voltage division and be converted into a 0-5V voltage signal which is collected by the PLC analog quantity, and finally, the signal collected by the PLC is sent into the PC computer.

[0025] System control process:

[0026] S1: The examinee opens the junction box, at this time, the opening signal of the junction box is transmitted into the computer through the magnetic control switch and the PLC in turn, and the formal examination process is started.

[0027] S2: In the process of connection, the examinee firstly shorts the current connection piece, and shorts the connection piece in the order of ABC.

[0028] Then disconnect the voltage connection piece, also in accordance with the ABC sequence disconnect the connection piece.

[0029] In this operation process, whether the order is correct, there is no other error, through the electric energy meter, pressure loss instrument, virtual load power supply to the PC computer signal to judge.

[0030] For example: when the electric energy meter A phase voltage loss, voltage loss instrument acquisition voltage normal, virtual load power normal output, then it shows that the A phase voltage connection piece is disconnected; if the electric energy meter A phase voltage loss, voltage loss instrument A phase voltage loss, virtual load power loop short circuit fault and closed output, then it shows that the voltage short circuit fault occurs. PC computer continuously cycle collection electric energy meter and voltage loss instrument data, when the operation error is judged, the software in the PC computer will be recorded.

[0031] S3: the examinee covers the terminal box, at this time the terminal box off signal through the magnetic control switch, PLC into the computer.

[0032] S4: the examinee opens the electric energy meter tail cover, at this time the electric energy meter sends signal to the PC computer, the PC computer sends instruction to the PLC, the PLC controls the switching circuit to switch the circuit, so that the electric energy meter is disconnected with the terminal box, but connected with the PLC, that is, switched to the acquisition circuit.

[0033] S5: after opening the electric energy meter tail cover, the wire is removed, the specific processing method is voltage line first, then current line, first in line, then out of line, first phase line and then zero line.

[0034] In the process of removing the wire, the PLC sends the PLC open signal and PLC analog quantity information to the PC computer, and the electric energy meter also sends the current and voltage information to the PC computer. By comprehensively judging these information, the specific wire removal information is obtained, which is used to judge whether the wire removal order of the examinee is correct.

[0035] For example: the electric energy meter acquires A phase current signal disappearance, and the voltage loss instrument A phase current is normal, which indicates that the current short circuit A item is correct. If the electric energy meter acquires A phase current signal disappearance, and the voltage loss instrument A phase current disappears, the virtual load occurs alarm, the current is open circuit, and the power is automatically closed. Then it shows that an error occurs, and the software in the PC computer will be recorded.

[0036] S6: install new electric meter, and connect the tail in the opposite order when removing the wire. The judgment process is the same as above.

[0037] S7: cover the tail cover of the new electric meter, and the electric energy meter switches back to the terminal box.

[0038] S8: open the terminal box again, restore the connection of the terminal box, and the judgment process is the same as above.

[0039] S9: close the terminal box, the examination is over, and the scoring begins.

Claims

1. A live meter change simulation device based on a smart meter, characterized by The utility model relates to a kind of test equipment for electrician, including acquisition circuit, control circuit, host computer, electric energy meter, switching circuit, virtual load power supply, voltage loss instrument, terminal box, wherein virtual load power supply is connected with terminal box, terminal box is connected with voltage loss instrument, electric energy meter is connected with primary circuit of switching circuit, switching circuit has two working states, and its primary circuit is connected with terminal box or acquisition circuit respectively, control circuit is connected with secondary circuit of switching circuit, for controlling switching circuit switching working state, wherein host computer is connected with acquisition circuit, control circuit, electric energy meter, virtual load power supply, voltage loss instrument for communication; The acquisition circuit is composed of PLC, wherein the connection mode of the primary circuit of the switching circuit and the acquisition circuit is that the current loop from the electric energy meter is directly connected to the PLC input signal, and the voltage loop from the electric energy meter is connected to the PLC analog quantity after being converted into 0-5V voltage signal through resistance voltage division; When the switching circuit is connected with the terminal box, whether the examinee's disconnection and connection operation on the terminal box is correct is judged by the signals sent by the electric energy meter, the voltage loss instrument and the virtual load power supply to the host computer. When the switching circuit is connected with the acquisition circuit, the PLC input signal and the PLC analog quantity information are sent to the host computer by the acquisition circuit, and the current and voltage information are also sent to the host computer by the electric energy meter, so as to judge whether the examinee's disconnection and connection operation on the electric energy meter is correct.

2. The live meter change simulation device based on smart meter according to claim 1, characterized in that The host computer is a PC computer.

3. The smart meter based live meter change simulation apparatus as claimed in claim 1, wherein, The control circuit is composed of PLC, and the connection mode of the control circuit and the secondary circuit of the switching circuit is that the output relay of the PLC is connected with the secondary circuit of the switching circuit.

4. The smart meter based live meter change simulation apparatus as claimed in claim 1, wherein An opening and closing position sensor is installed on the terminal box, and the signal of the opening and closing position sensor is connected to the acquisition circuit.

5. The smart meter based live meter change simulation apparatus as claimed in claim 4, wherein The opening and closing position sensor is a magnetic control switch.

6. The smart meter based live meter change simulation apparatus as claimed in claim 1, wherein The switching circuit is a switching relay.

7. The smart meter based live meter change simulation apparatus as claimed in claim 1, wherein The communication connection between the host computer and the acquisition circuit, the control circuit, the electric energy meter, the virtual load power supply and the voltage loss instrument is 485 communication connection.

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