Electric meter fast thief
There is no limit to creativity, and the instrument is invented. Today, I will introduce a patent for the invention of a national invention - a rapid watch thief. The patent was applied for by the State Grid Hebei Electric Power Company 邯郸 Power Supply Branch and was authorized to be announced on April 12, 2017.
Description
The invention relates to an electric meter inspecting and stealing instrument, in particular to an electric meter fast stealing device, which is suitable for measuring electric parameters of an electric energy meter on the spot, thereby judging whether the electric energy meter is normal, with or without electricity stealing behavior.
Background of the invention
At present, the existing electric energy meter on-site scrambling equipment mostly adopts a structure in which the main unit and the clamp meter are separated, and the clamp meter and the main unit must be connected by a long line. Therefore, the wiring of the structure is complicated and the signal is easy to collect. It is disturbed, the operation is complicated, the measurement data is inaccurate, and it is inconvenient to use. In addition, although there is now a power meter inspector that integrates the clamp meter and the host, the circuit structure is complicated, the internal data calculation process is very complicated, and the calculation speed is slow; therefore, it is troublesome to maintain, and Easy to quickly steal electricity.
Summary of the invention
The object of the present invention is to design an electric meter fast hacking instrument which integrates a clamp meter and a host computer. The hacker is a miniature hand-held electric measuring instrument suitable for the field, which is convenient to carry and easy to wire, and is not easy to receive when collecting signals. The interference, the measurement data is accurate, the operation is simple, and the circuit structure is simple, the calculation process of the internal data of the circuit is simple, the calculation speed is fast, and the electric energy meter can be quickly judged whether the electric energy meter is normal, and there is no stealing behavior, and the use is simpler.
The picture shows the overall frame of the working circuit board
The object of the present invention can be achieved by the following technical solutions: the automatic fast-tracking device of the electric meter includes a main body casing, a clamp meter and a working circuit board, and the main body casing is provided with a liquid crystal screen observation window, and the pliers The watch is composed of a clamp head housing and an iron core, and the working circuit board is installed in the main body casing, wherein the working circuit board comprises a main control CPU, a front end signal conditioning circuit, a keyboard circuit, and a voice circuit. , power circuit and LCD liquid crystal interface circuit, the main control CPU has microcontroller U5, external clock circuit, pull-down resistor R17, CPU power-on reset circuit, CPU power supply VCC decoupling capacitor, polar capacitor E5, AD interface analog power supply Filter circuit and 0 ohm resistor R21, wherein the model of the microcontroller U5 is STM32F100CBT6, the external clock circuit has 8M crystal oscillator Y1 and capacitors C7 and C8, the CPU power-on reset circuit has resistor R18 and capacitor C9, CPU power supply VCC retreat The coupling capacitor has capacitors C10, C11 and C12. The AD interface analog power supply filter circuit has an inductor L2, a capacitor C13 and a polar capacitor E6. The front-end signal conditioning circuit has a four-channel high-precision operational amplifier. Pressure followers U2A, U2C and U2D, AC current sampling input terminal P1, AC voltage input terminal P2, resistors R1, R3 to R10 and R12, capacitors C1 to C3, and clamp diodes D1 and D3 to D5, four-channel high precision The model of the operational amplifier is SGM8554, the models of the clamp diodes D1 and D3~D5 are all IN4148; the keyboard circuit has the control buttons KEY1 and KEY2 and the resistors R11 and R13; the voice circuit has the audio power amplifier chip U3 and the polar capacitor E3. And E4, capacitors C4 and C5, resistors R14 and R15 and speaker SP1, the model of the audio power amplifier chip U3 is SGM4890YMS; the power circuit has a battery BT1, a switching voltage regulator U1, a polar capacitor E1 and E2, a diode D2 Inductor L1, resistor R2 and DIP switch S 1 , whose switching voltage regulator U 1 is LM 2 5 9 6 S - 3 .3 , diode D 2 is STPS2L25U, and inductor L1 is DO3316P-104. The DIP switch type S1 is SW DIP-6; the LCD liquid crystal interface circuit has LCD driver U4, resistor R16, capacitor C6 and 4-digit 7-segment digital LCD screen DS1, and its LCD driver U4 is HT1621B, 4 digit 7 Segment digital LCD screen DS1 model is GDC8 310.
The internal operation process of the tracer measuring the incoming line current Ia or the zero line outgoing current Ib is: inputting the live line incoming current analog signal or the zero line outgoing current analog signal in the tracer, after the internal working circuit board of the tracer After the front-end signal conditioning circuit is conditioned, it is directly input into the microcontroller U5 of the main control CPU1, and after the internal AD conversion of the microcontroller U5, the instantaneous current sampling value of the live line or the neutral line is obtained, and the live line is entered or The instantaneous current sampling value of the neutral line output is calculated by the microcontroller U5 to obtain the current effective value of the hot line incoming line or the neutral line outgoing line, that is, the live line incoming line current Ia or the zero line outgoing line current Ib is measured; the live line incoming current Ia and the neutral line are measured. After the outgoing current Ib is measured, the sniffer is judged according to the following judgment basis, and the voice circuit gives a corresponding vocal voice prompt according to the judgment result; the judgment basis is: when Ia / Ib -1 > 15% When the prompt “Zero line may be disconnectedâ€, when Ia / Ib -1 < 15%, it prompts “There is outside line accessâ€, and the above two cases indicate that the status of the energy meter is abnormal and there may be power stealing behavior.
In the power supply circuit of the present invention, the battery BT1 is a 9V alkaline battery. The dial switch S1 is a dial dial switch. Between the LCD liquid crystal interface circuit of the present invention and the main control CPU, the first to fourth pins of the LCD driver U4 are respectively connected to the fourth, third, second and 46th pins of the microcontroller U5 through the SPI communication interface. .
The invention has the advantages that the sniffer is a miniature hand-held electric measuring instrument suitable for the field, and is convenient to carry; adopts a design of a combination of a clamp meter and a host, and is controlled by a 32-bit Cortex-M3 core microcontroller, and the circuit The utility model has the advantages of simple structure, no power failure during use, no change of the circuit connection of the metering electric energy meter, as long as the clamp meter is respectively inserted into the live line and the neutral line of the electric energy meter, the live line current and the neutral line of the electric energy meter line can be measured. The outgoing current, and then through the fast calculation of the master CPU of the thief, quickly determine whether the energy meter is normal, with or without tampering behavior, and simultaneously emits a beautiful voice prompt, easy wiring, simple operation, simple calculation process of internal data of the circuit The calculation speed is fast, more humanized, and it is easier to use; the clamp meter wiring is short, which can avoid interference when collecting signals, and the measurement data is more accurate.
Description
The invention relates to an electric meter inspecting and stealing instrument, in particular to an electric meter fast stealing device, which is suitable for measuring electric parameters of an electric energy meter on the spot, thereby judging whether the electric energy meter is normal, with or without electricity stealing behavior.
Background of the invention
At present, the existing electric energy meter on-site scrambling equipment mostly adopts a structure in which the main unit and the clamp meter are separated, and the clamp meter and the main unit must be connected by a long line. Therefore, the wiring of the structure is complicated and the signal is easy to collect. It is disturbed, the operation is complicated, the measurement data is inaccurate, and it is inconvenient to use. In addition, although there is now a power meter inspector that integrates the clamp meter and the host, the circuit structure is complicated, the internal data calculation process is very complicated, and the calculation speed is slow; therefore, it is troublesome to maintain, and Easy to quickly steal electricity.
Summary of the invention
The object of the present invention is to design an electric meter fast hacking instrument which integrates a clamp meter and a host computer. The hacker is a miniature hand-held electric measuring instrument suitable for the field, which is convenient to carry and easy to wire, and is not easy to receive when collecting signals. The interference, the measurement data is accurate, the operation is simple, and the circuit structure is simple, the calculation process of the internal data of the circuit is simple, the calculation speed is fast, and the electric energy meter can be quickly judged whether the electric energy meter is normal, and there is no stealing behavior, and the use is simpler.
The picture shows the overall frame of the working circuit board
The object of the present invention can be achieved by the following technical solutions: the automatic fast-tracking device of the electric meter includes a main body casing, a clamp meter and a working circuit board, and the main body casing is provided with a liquid crystal screen observation window, and the pliers The watch is composed of a clamp head housing and an iron core, and the working circuit board is installed in the main body casing, wherein the working circuit board comprises a main control CPU, a front end signal conditioning circuit, a keyboard circuit, and a voice circuit. , power circuit and LCD liquid crystal interface circuit, the main control CPU has microcontroller U5, external clock circuit, pull-down resistor R17, CPU power-on reset circuit, CPU power supply VCC decoupling capacitor, polar capacitor E5, AD interface analog power supply Filter circuit and 0 ohm resistor R21, wherein the model of the microcontroller U5 is STM32F100CBT6, the external clock circuit has 8M crystal oscillator Y1 and capacitors C7 and C8, the CPU power-on reset circuit has resistor R18 and capacitor C9, CPU power supply VCC retreat The coupling capacitor has capacitors C10, C11 and C12. The AD interface analog power supply filter circuit has an inductor L2, a capacitor C13 and a polar capacitor E6. The front-end signal conditioning circuit has a four-channel high-precision operational amplifier. Pressure followers U2A, U2C and U2D, AC current sampling input terminal P1, AC voltage input terminal P2, resistors R1, R3 to R10 and R12, capacitors C1 to C3, and clamp diodes D1 and D3 to D5, four-channel high precision The model of the operational amplifier is SGM8554, the models of the clamp diodes D1 and D3~D5 are all IN4148; the keyboard circuit has the control buttons KEY1 and KEY2 and the resistors R11 and R13; the voice circuit has the audio power amplifier chip U3 and the polar capacitor E3. And E4, capacitors C4 and C5, resistors R14 and R15 and speaker SP1, the model of the audio power amplifier chip U3 is SGM4890YMS; the power circuit has a battery BT1, a switching voltage regulator U1, a polar capacitor E1 and E2, a diode D2 Inductor L1, resistor R2 and DIP switch S 1 , whose switching voltage regulator U 1 is LM 2 5 9 6 S - 3 .3 , diode D 2 is STPS2L25U, and inductor L1 is DO3316P-104. The DIP switch type S1 is SW DIP-6; the LCD liquid crystal interface circuit has LCD driver U4, resistor R16, capacitor C6 and 4-digit 7-segment digital LCD screen DS1, and its LCD driver U4 is HT1621B, 4 digit 7 Segment digital LCD screen DS1 model is GDC8 310.
The internal operation process of the tracer measuring the incoming line current Ia or the zero line outgoing current Ib is: inputting the live line incoming current analog signal or the zero line outgoing current analog signal in the tracer, after the internal working circuit board of the tracer After the front-end signal conditioning circuit is conditioned, it is directly input into the microcontroller U5 of the main control CPU1, and after the internal AD conversion of the microcontroller U5, the instantaneous current sampling value of the live line or the neutral line is obtained, and the live line is entered or The instantaneous current sampling value of the neutral line output is calculated by the microcontroller U5 to obtain the current effective value of the hot line incoming line or the neutral line outgoing line, that is, the live line incoming line current Ia or the zero line outgoing line current Ib is measured; the live line incoming current Ia and the neutral line are measured. After the outgoing current Ib is measured, the sniffer is judged according to the following judgment basis, and the voice circuit gives a corresponding vocal voice prompt according to the judgment result; the judgment basis is: when Ia / Ib -1 > 15% When the prompt “Zero line may be disconnectedâ€, when Ia / Ib -1 < 15%, it prompts “There is outside line accessâ€, and the above two cases indicate that the status of the energy meter is abnormal and there may be power stealing behavior.
In the power supply circuit of the present invention, the battery BT1 is a 9V alkaline battery. The dial switch S1 is a dial dial switch. Between the LCD liquid crystal interface circuit of the present invention and the main control CPU, the first to fourth pins of the LCD driver U4 are respectively connected to the fourth, third, second and 46th pins of the microcontroller U5 through the SPI communication interface. .
The invention has the advantages that the sniffer is a miniature hand-held electric measuring instrument suitable for the field, and is convenient to carry; adopts a design of a combination of a clamp meter and a host, and is controlled by a 32-bit Cortex-M3 core microcontroller, and the circuit The utility model has the advantages of simple structure, no power failure during use, no change of the circuit connection of the metering electric energy meter, as long as the clamp meter is respectively inserted into the live line and the neutral line of the electric energy meter, the live line current and the neutral line of the electric energy meter line can be measured. The outgoing current, and then through the fast calculation of the master CPU of the thief, quickly determine whether the energy meter is normal, with or without tampering behavior, and simultaneously emits a beautiful voice prompt, easy wiring, simple operation, simple calculation process of internal data of the circuit The calculation speed is fast, more humanized, and it is easier to use; the clamp meter wiring is short, which can avoid interference when collecting signals, and the measurement data is more accurate.
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