CN103323637A - Low-voltage intelligent electric meter electricity-stealing checking device - Google Patents

Abstract

The invention discloses a low-voltage smart meter electricity stealing device, which includes an electric test pen, a first clamp ammeter and a second clamp ammeter, and the output terminals of the test pen, the first clamp ammeter and the second clamp ammeter are respectively Connect electricity stealing analyzer by wire; Described electricity stealing analyzer includes single-chip microcomputer, power module, alarm circuit and display unit, the output end of described power module is connected with single-chip microcomputer, alarm circuit and display unit respectively, and the input end of single-chip microcomputer is respectively connected with The output terminals of the electroscope, the first clamp ammeter and the second clamp ammeter are connected, and the output terminals of the single-chip microcomputer are respectively connected with the alarm circuit and the display unit. The invention is simple in structure, low in cost, and high in safety and reliability. It is applied in the low-voltage power grid to check whether the user using the smart meter has electricity theft, and can accurately judge whether the electricity theft is happening, so as to stop it in time. Reduced losses in the power supply sector.

Description

Low-voltage smart meter check electricity theft device

technical field

The invention relates to the technical field of power systems, in particular to a device for checking electricity stealing behaviors in low-voltage users.

Background technique

With the increasing development of the smart grid, the demand for matching intelligent user terminals is also increasing. The smart meter is a new type of electric energy meter and the smart terminal of the smart grid. It is mainly used in the low-voltage power grid. In addition to the metering function of the basic electricity consumption of the traditional meter, it also has the function of prepayment, which does not require manual meter reading, avoiding the inconvenience caused by manual meter reading to users, and at the same time solving the problem of difficulty in charging. On this basis, in order to adapt to the smart grid, the smart meter also has a hardware clock and a complete communication interface, the reliability and security are greatly improved, and it meets the requirements of energy conservation and environmental protection.

However, in order to seek illegal benefits, individual electricity users have repeatedly banned electricity theft. The early anti-stealing technology mainly sealed the fastening screws used to fasten the live wire and the neutral wire on the metering device. It is easy to be affected by natural factors such as the environment and climate, and naturally fall off, causing misjudgment of electricity stealing behavior, causing misunderstanding between power supply companies and users, and is no longer used at present, which provides a basis for stealing electricity for users . At present, the most used and most dangerous methods of stealing electricity are direct wiring in front of the smart meter, connecting the zero line and live wire at the outlet of the smart meter, modifying the internal circuit of the smart meter or cutting off the external circuit of the meter. , the purpose of which is to prevent the current from passing through the smart meter to achieve the purpose of stealing electricity and bring greater losses to the power supply department.

Contents of the invention

The technical problem to be solved by the present invention is to provide a smart meter electricity stealing device capable of accurately judging electricity theft, effectively preventing illegal electricity theft and reducing losses for power supply departments.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows.

The low-voltage smart meter electricity stealing device includes an electric test pen for identifying whether the live wire connection of the smart meter is correct, and a first clamp ammeter and a second clamp for measuring the current value of the live wire and the neutral wire current at the outlet end of the smart meter respectively. Shaped ammeter, the output ends of described electroscope pen, the first clamp ammeter and the second clamp ammeter are respectively connected to electricity stealing analyzer by wire; Described electricity stealing analyzer includes single-chip microcomputer, power supply module and alarm that are arranged in the insulating shell circuit, the outer end surface of the insulating casing is provided with a display unit for displaying electricity theft, the output terminals of the power module are respectively connected to the single-chip microcomputer, the alarm circuit and the display unit, and the input terminals of the single-chip microcomputer are respectively connected to the electroscope, the first clamp The ammeter is connected to the output end of the second clamp ammeter, and the output end of the single chip microcomputer is respectively connected to the alarm circuit and the display unit.

The specific structure of the display unit is as follows: the display unit includes a first digital tube for displaying the current value of the live line, a second digital tube for displaying the current value of the neutral line, and a second digital tube for displaying the intelligent The live wire indicator light of the live wire connection status at the outlet end of the electric meter, the first nixie tube, the second nixie tube and the live wire indicator light are respectively connected to the output end of the single-chip microcomputer.

The improvement of the display unit is: the display unit also includes a display screen arranged on the outer end surface of the insulating shell for displaying the stealing state, and the input end of the display screen is connected to the output end of the single-chip microcomputer.

The improvement of the electricity stealing analyzer is that: the electricity stealing analyzer also includes an interface unit for data transmission with the smart meter through 485 communication, and the output end of the interface unit is connected to the input end of the single-chip microcomputer.

The specific structure of the alarm circuit is as follows: the alarm circuit includes an alarm indicator light and a buzzer arranged on the outer end surface of the insulating shell, and the input terminals of the alarm indicator light and the buzzer are respectively connected to the output terminals of the single-chip microcomputer.

Owing to adopting above-mentioned technical scheme, the technological progress that the present invention obtains is as follows.

The invention is simple in structure, low in cost, and high in safety and reliability. It is applied in the low-voltage power grid to check whether the user using the smart meter has electricity theft, and can accurately judge whether the electricity theft is happening, so as to stop it in time. Reduced losses in the power supply sector.

Description of drawings

Fig. 1 is a structural block diagram of the present invention;

Fig. 2 is a front view of the insulating case of the present invention.

Among them: 1. The first clamp ammeter, 2. The second clamp ammeter, 3. Electroscope pen, 4. Electricity stealing analyzer, 41. Single-chip microcomputer, 42. Power module, 43. Alarm circuit, 431. Alarm indicator light, 432. Buzzer, 44. Display unit, 441. First digital tube, 442. Second digital tube, 443. FireWire indicator light, 444. Display screen, 45. Interface unit, 5. Switch.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

A low-voltage smart meter electricity stealing device, its structure is shown in Figure 1, including a first clamp ammeter 1, a second clamp ammeter 2, a test pen 3 and a steal electricity analyzer 4. Among them: the electric test pen 3 is used to identify whether the live wire connection of the smart meter is correct, the first clamp ammeter 1 is used to measure the current value flowing through the live wire at the outlet terminal of the smart meter, and the second clamp ammeter 2 is used to measure the current value flowing through the outlet terminal of the smart meter. The current value of the zero line; the output ends of the first clamp ammeter 1, the second clamp ammeter 2, and the electroscope pen 3 are respectively connected to the input end of the electricity stealing analyzer 4, and the electricity stealing analyzer collects The information of the smart meter is used to check whether there is electricity stealing behavior.

Electricity stealing analyzer 4 comprises single-chip microcomputer 41, power module 42, alarm circuit 43, display unit 44 and interface unit 45, wherein single-chip microcomputer 41, power module 42, alarm circuit 43 and interface unit 45 are all arranged in the insulating shell, and display unit 44 Then it is arranged on the outer end face of the insulating shell.

The output terminals of the power supply module 42 are respectively connected with the single chip microcomputer 41, the alarm circuit 43 and the display unit 44 to provide them with working power.

The single-chip microcomputer 41 is mainly used for judging and analyzing whether the stealing behavior occurs according to the collected information, and the input terminals of the single-chip microcomputer are respectively connected with the output terminals of the electroscope 3, the first clamp-on ammeter 1, the second clamp-on ammeter 2 and the interface unit 45 , the output end of the single chip microcomputer 41 is connected with the alarm circuit 43 and the display unit 44 respectively.

The display unit 44 is used to display the status of the stealing behavior after the detection and analysis of the single-chip microcomputer. The input terminals of a digital tube 441, a second digital tube 442, a live wire indicator light 443 and a display screen 444 are respectively connected with the output terminals of the single-chip microcomputer 41; the front view of the insulating shell is shown in FIG. 2 . The first digital tube 441 is used to display the actual current value of the live wire, the second digital tube 442 is used to display the actual current value of the neutral wire, the live wire indicator light 443 is used to display whether the connection status of the live wire at the outgoing terminal of the smart meter is correct, and the display screen 444 is used to show if electricity theft is taking place.

The alarm circuit 43 is used to send an alarm message when the single-chip microcomputer analyzes that the stealing behavior is taking place, and reminds the operator to stop it in time, mainly including an alarm indicator light 431 and a buzzer 432 arranged on the outer end surface of the insulating shell, and the alarm indicator light 431 The input ends of the buzzer 432 are respectively connected with the output ends of the single-chip microcomputer 41, and are used for sending an alarm signal under the control of the single-chip microcomputer.

The interface unit 45 is used for data transmission with the smart meter through the 485 communication mode, and transmits the current value in the smart meter to the single-chip microcomputer for operation by the single-chip microcomputer. The output end of the interface unit 45 is connected to the input end of the single-chip microcomputer 41 .

The present invention is mainly applied to checking whether smart meter users have electricity stealing behavior in the 220V low-voltage power grid, and its usage method is as follows.

First, touch the electroscope pen to the first terminal and the second terminal of the smart meter to check whether the connection status of the live wire is correct. If the indicator light of the live wire is on, it indicates that the connection is correct; if the indicator light of the live wire is off, it means that the live wire and The zero line is reversed, and the microcontroller preliminarily judges that the electricity stealing behavior may be taking place.

Then, according to the detection results of the above steps, the first clamp ammeter and the second clamp ammeter are respectively clamped on the live wire and the neutral wire to read the live wire current value and the neutral wire current value; the first clamp ammeter and the neutral wire current value The current value measured by the second clamp ammeter is transmitted to the single-chip microcomputer through the wire, and the single-chip microcomputer displays through the first digital tube and the second digital tube after processing, and judges whether the current value of the live line and the current value of the neutral line are the same.

When the difference between the current value of the live wire and the current value of the neutral wire is large, it can indicate that the user is borrowing other neutral wires to steal electricity. At this time, the single-chip microcomputer transmits the alarm command to the alarm circuit, the alarm indicator light flickers, and the buzzer sends out an alarm; at the same time, the single-chip microcomputer transmits the analysis and judgment results to the display screen for visual display.

When the current value of the live line is equal to the current value of the neutral line, but different from the current value displayed by the smart meter, it can indicate that the user has modified the internal circuit of the smart meter to steal electricity. As above, the single-chip microcomputer sends an alarm command to the alarm circuit.

Claims (5)

1. the low-voltage intelligent ammeter is looked into electricity filching device, it is characterized in that: comprise that the output terminal of described electroscope (3), first clamp on amperemeter (1) and second clamp on amperemeter (2) is connected stealing analyser (4) by lead respectively for differentiating whether correct electroscope (3) and be respectively applied to measure first clamp on amperemeter (1) and second clamp on amperemeter (2) that the intelligent electric meter leading-out terminal flows through live wire current value and neutral line current value of intelligent electric meter live wire wiring; Described stealing analyser (4) comprises the single-chip microcomputer (41) that is arranged in the insulation crust, power module (42) and warning circuit (43), the outer face of insulation crust is provided with for the display unit (44) that shows electricity filching behavior, the output terminal of described power module (42) respectively with single-chip microcomputer (41), warning circuit (43) and display unit (44) connect, the input end of single-chip microcomputer (41) respectively with electroscope (3), first clamp on amperemeter (1) is connected with the output terminal of second clamp on amperemeter (2), and the output terminal of single-chip microcomputer (41) is connected with display unit (44) with warning circuit (43) respectively.

2. low-voltage intelligent ammeter according to claim 1 is looked into electricity filching device, it is characterized in that: described display unit (44) comprises and is arranged on the insulation crust outer face first charactron (441) that is used for showing the live wire current value, is used for showing second charactron (442) of neutral line current value and the live wire pilot lamp (443) that is used for showing intelligent electric meter leading-out terminal live wire wiring state that described first charactron (441), second charactron (442) and live wire pilot lamp (443) are connected with the output terminal of single-chip microcomputer (41) respectively.

3. low-voltage intelligent ammeter according to claim 2 is looked into electricity filching device, it is characterized in that: described display unit (44) comprises also and is arranged on the insulation crust outer face display screen (444) that is used for showing the stealing state that the input end of described display screen (444) connects the output terminal of single-chip microcomputer (41).

4. low-voltage intelligent ammeter according to claim 1 is looked into electricity filching device, it is characterized in that: described stealing analyser (4) comprises also with intelligent electric meter and carries out the interface unit (45) of data transmission by 485 communication modes that the output terminal of interface unit (45) connects the input end of single-chip microcomputer (41).

5. low-voltage intelligent ammeter according to claim 1 is looked into electricity filching device, it is characterized in that: described warning circuit (43) comprises alarm lamp (431) and the hummer (432) that is arranged on the insulation crust outer face, and the input end of described alarm lamp (431) and hummer (432) is connected with the output terminal of single-chip microcomputer (41) respectively.

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