CN219348990U - Electric energy meter load high resistance and electricity stealing detection circuit based on metering chip - Google Patents
Electric energy meter load high resistance and electricity stealing detection circuit based on metering chip Download PDFInfo
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- CN219348990U CN219348990U CN202222995269.0U CN202222995269U CN219348990U CN 219348990 U CN219348990 U CN 219348990U CN 202222995269 U CN202222995269 U CN 202222995269U CN 219348990 U CN219348990 U CN 219348990U
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Abstract
The utility model discloses a metering chip-based electric energy meter load high-resistance and electricity stealing detection circuit, which can effectively detect the state of an electric energy meter power supply control switch SCS1 and the voltage at the output end of the electric energy meter power supply control switch and the load impedance state of a load end when the electric energy meter power supply control switch SCS1 is in a switching-off state, and a user judges whether electricity stealing occurs or not by detecting the state of the power supply control switch; the safety closing of a user can be ensured by detecting the high-resistance state of the load; the intelligent ammeter can effectively avoid contradiction such as electricity disputes, and is greatly beneficial to popularization, application and maintenance of the intelligent ammeter.
Description
Technical Field
The utility model relates to the field of electric energy meters of intelligent power grids, in particular to an application for detecting high resistance of a load and detecting electricity theft under the condition that a power supply control switch of the electric energy meter is pulled.
Background
Along with the development of scientific technology, the functions of intelligent electric energy meters which are important components of intelligent power grids are more and more increased along with the improvement of industrial production and living standard of people, and various anti-electricity-theft functions are respectively developed by each electric energy meter factory, but most of the current anti-electricity-theft technologies are mainly realized by detecting auxiliary circuit current, and the conditions of electricity utilization disputes and the like caused by judgment errors exist.
Meanwhile, when the electric energy meter is in overload switching-off, the power supply office needs to restore power supply to the user side through remote switching-on; the user side can operate the electric equipment under the consciousness of no electricity, potential safety hazards exist, and in order to solve the problem, the method of disconnecting the main switch through the user side to enable the electric energy meter to detect high resistance and then automatically closing the electric energy meter is specially designed, so that safe power restoration is realized, and the method is the practical meaning of load high resistance detection.
Disclosure of Invention
The utility model aims to solve the problems of potential safety hazard and electricity larceny prevention when a power supply bureau recovers power supply after overload brake release of an electric energy meter, and designs a method for detecting high load resistance and electricity larceny prevention of the electric energy meter through an ultrahigh-precision single-phase multifunctional metering chip, which can effectively detect the voltage of an output terminal of the electric energy meter and the load impedance state of a load end when a power supply control switch in the electric energy meter is in a brake release state.
The technical scheme of the utility model is as follows:
the utility model provides an electric energy meter load high resistance and electricity stealing detection circuit based on a high-precision single-phase multifunctional metering chip, which comprises a three-phase detection circuit, wherein each phase comprises the following components: a half-wave rectifying circuit, a resistor voltage dividing circuit and a corresponding phase metering chip,
the voltage input end of the power supply control switch is connected with the half-wave rectification circuit, the resistor voltage division circuit is connected with the half-wave rectification circuit, and the resistor voltage division circuit is connected with the signal output end to output signals to the corresponding phase metering chip.
Further, the third wiring terminal, the sixth wiring terminal and the ninth wiring terminal of the electric energy meter are connected with the inlet wires of the air switches SCS2, SCS4 and SCS6 in the user side distribution box;
an air switch SCS2 in the distribution box at the user side is connected with one end of an electric load R4 and one end of an electric load C2 at the user side in series, and the other ends of the loads R4 and C2 are connected with a tenth wiring terminal of the electric energy meter;
an air switch SCS4 in the distribution box at the user side is connected with one end of an electric load R8 and one end of an electric load C4 at the user side in series, and the other ends of the loads R8 and C4 are connected with a tenth wiring terminal of the electric energy meter;
the outlet of the air switch SCS6 in the distribution box at the user side is connected with one end of the electric loads R12 and C6 at the user side in series, and the other ends of the loads R12 and C6 are connected with a tenth connecting terminal of the electric energy meter.
Further, the phase a detection circuit includes resistors R1, R2, R3, a capacitor C1, diodes D1, D2, and a power control switch SCS1, where the power control switch SCS1 is built into the electric energy meter:
the tenth wiring terminal of the electric energy meter is connected with the positive electrode of the diode D1 through the resistor R1, and is simultaneously connected with the third wiring terminal of the electric energy meter, and the negative electrode of the diode D1 is connected with one end of the resistor R2; the other end of the resistor R2 is connected with one end of the resistor R3 and is simultaneously connected with the ADC end of the A-phase metering chip; the other end of the resistor R3 is grounded; the two ends of the resistor R3 are connected with a capacitor C1 in parallel and used for filtering; the diode D2 is connected in parallel with the two ends of the resistor R3 and used for voltage stabilization protection;
B. the phase C detection circuit is consistent with the phase A.
Further, the capacitors C2, C4 and C6 are all parasitic capacitors of the cable.
Further, the resistors R1 and R2 are M omega-level resistors, and the resistor R3 is a k omega-level resistor.
Further, the resistors R1, R2, R3 are respectively formed by connecting a plurality of resistors in series.
Further, the rated operating voltage of the electric energy meter is 230V.
The utility model has the beneficial effects that:
the detection circuit provided by the utility model can identify the state of the power control switch and whether the circuit is in a high-resistance state according to the actual detected size and the numerical value in the normal state.
In the detection circuit, taking the A phase as an example, the operation of switching off the master switch SCS2 in the distribution box by the user side is matched, so that the A phase metering chip of the electric energy meter detects high resistance of a load, then the power supply control switch of the electric energy meter is automatically switched on, and at the moment, the user side can control the master switch SCS2 in the distribution box to be switched on in a safe state, thereby realizing safe recovery of power supply.
The detection circuit provided by the utility model can not only effectively detect the actual state of the relay, but also judge whether the circuit is in a high-resistance state and confirm whether a user steals electricity or not, thereby effectively avoiding contradictions such as electricity disputes and the like and being greatly beneficial to popularization and maintenance of the intelligent ammeter.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.
FIG. 1 is an internal wiring diagram of an electric energy meter according to the present utility model.
Fig. 2 is a block diagram of a detection circuit of an electric energy meter according to the present utility model.
Fig. 3 is a schematic diagram of a phase a power control switch state and high resistance detection according to the present utility model.
Fig. 4 is a schematic diagram of the state of the B-phase power control switch and the high resistance detection according to the present utility model.
Fig. 5 is a schematic diagram of the utility model for controlling the switch state and high resistance detection of the C-phase power supply.
Fig. 6 is a simulation diagram of the present utility model in the case of closing a power control switch.
FIG. 7 is a simulation diagram of the power control switch of the present utility model in the case of switching off.
FIG. 8 is a flowchart of the high resistance test procedure of the present utility model.
Detailed Description
Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein.
As shown in fig. 1-5, the utility model provides an electric energy meter load high resistance and electricity stealing detection circuit based on a metering chip:
for phase a in a three-phase power meter circuit, as shown in fig. 3, the detection circuit includes: resistors R1, R2, R3, diodes D1, D2, capacitor C1 and power control switch SCS1.
The first connection terminal 1 is a voltage input end, and a voltage signal is transmitted to the second connection terminal 2 through a power control switch SCS1 or a resistor R3 and a resistor R2; the second connection terminal 2 is connected to the tenth connection terminal 10 through a resistor R1; the ADC of the metering chip obtains a direct current signal after half-wave rectification of a diode D1, and then the direct current signal is reduced to a proper voltage value through the partial pressure of a resistor R2 and a resistor R3; a capacitor C1 for filtering; and the diode D2 is used for voltage stabilizing protection.
For phase B in a three-phase power meter circuit, as shown in fig. 4, the detection circuit includes: resistors R5, R6, R7, diodes D3, D4, capacitor C3 and power control switch SCS3.
The fourth connection terminal 4 is a voltage input terminal, and a voltage signal thereof is transmitted to the sixth connection terminal 6 through the power control switch SCS3 or the resistor R7, the resistor R6; the sixth connection terminal 6 is connected to the tenth connection terminal 10 through a resistor R5; the ADC of the metering chip obtains a direct current signal after half-wave rectification of a diode D3, and then the direct current signal is reduced to a proper voltage value through the partial pressure of a resistor R6 and a resistor R7; a capacitor C3 for filtering; and the diode D4 is used for voltage stabilizing protection.
For the C phase in the three-phase electric energy meter circuit, as shown in fig. 5, the detection circuit includes: resistors R9, R10, R11, diodes D5, D6, capacitor C5 and power control switch SCS5.
The seventh connection terminal 7 is a voltage input terminal, and a voltage signal thereof is transmitted to the ninth connection terminal 9 through the power control switch SCS5 or the resistor R10, the resistor R11; the ninth connection terminal 9 is connected to a tenth connection terminal 10 through a resistor R9; the ADC of the metering chip obtains a direct current signal after half-wave rectification of a diode D5, and then the direct current signal is reduced to a proper voltage value through the partial pressure of a resistor R10 and a resistor R11; a capacitor C5 for filtering; and the diode D6 is used for voltage stabilizing protection.
Wherein, the resistors R1-R3, R5-R7 and R9-R11 are all high-precision resistors with +/-1 percent.
The specific implementation method comprises the following steps:
1. the method for detecting the load high resistance of the electric energy meter comprises the following steps:
Wherein: un is the rated operating voltage of the electric energy meter.
The resistors R1 and R2 are M omega-level high-precision and precise, the resistor R3 is k omega-number-level high-precision and precise, and the resistors can be formed by connecting a plurality of high-precision precise resistors in series.
The resistor R4 is a load resistance value which is k omega order, and takes a value according to specific conditions during calculation.
step 3, the metering chip detects the signal output end U/U in real time ADC Voltage value U/U ADC The voltage value is smaller than the high resistance threshold U ADC0 Setting the high-resistance flag bit at 1; when the high-resistance flag bit is 1, the metering chip further judges the state of the power control switch SCS1, and when the power control switch SCS1 is closed, the metering chip judges the state to be a non-high-resistance state; when the power supply control switch SCS1 is turned off, it is determined to be in a high-resistance state.
And (3) judging the load high resistance of the B phase and the C phase of the three-phase electric energy meter by adopting the step (3).
When the metering chip judges that the loads of the three-phase electric energy meter are all high-resistance, the internal power supply control switch of the electric energy meter is automatically switched on, and at the moment, a user can control the air switches SCS2, SCS4 and SCS6 in the distribution box under a safe state.
2. Detecting whether the user side steals electricity or not, comprising the following steps:
wherein U is ADC The real-time voltage value of the signal output end is obtained;
wherein U is Electric network Setting a judgment threshold delta for actually measuring the voltage value of the output terminal of the electric energy meter 0 ；
Step 3, if delta is greater than delta 0 And if the power is stolen, alarming to a power supply company, otherwise, not processing.
With reference to fig. 6 and 7, the utility model uses Multisim tool to perform simulation verification, and when the meter power control switch SCS1 is switched on and the air switch SCS2 is switched off, U is as follows ADC The detected voltage is 0V; when the meter power supply control switch SCS1 is switched off and the air switch SCS2 is switched on, U ADC The detected voltage was 0.268V. U obtained by simulation ADC And a high resistance threshold U ADC0 The comparison is performed, and a high resistance flag is performed. Then, the state of the meter power control switch SCS1 is judged, and the high resistance state and the non-high resistance state are judged.
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (7)
1. The utility model provides an electric energy meter load high resistance and steal electric detection circuitry based on measurement chip which characterized in that includes three-phase detection circuitry, each phase includes: a half-wave rectifying circuit, a resistor voltage dividing circuit and a corresponding phase metering chip,
the voltage input end of the power supply control switch is connected with the half-wave rectification circuit, the resistor voltage division circuit is connected with the half-wave rectification circuit, and the resistor voltage division circuit is connected with the signal output end to output signals to the corresponding phase metering chip.
2. The metering chip-based electric energy meter load high resistance and electricity theft detection circuit according to claim 1, wherein,
the third wiring terminal, the sixth wiring terminal and the ninth wiring terminal of the electric energy meter are connected with inlet wires of air switches SCS2, SCS4 and SCS6 in the user side distribution box;
an air switch SCS2 in the distribution box at the user side is connected with one end of an electric load R4 and one end of an electric load C2 at the user side in series, and the other ends of the loads R4 and C2 are connected with a tenth wiring terminal of the electric energy meter;
an air switch SCS4 in the distribution box at the user side is connected with one end of an electric load R8 and one end of an electric load C4 at the user side in series, and the other ends of the loads R8 and C4 are connected with a tenth wiring terminal of the electric energy meter;
the outlet of the air switch SCS6 in the distribution box at the user side is connected with one end of the electric loads R12 and C6 at the user side in series, and the other ends of the loads R12 and C6 are connected with a tenth connecting terminal of the electric energy meter.
3. The metering chip-based power meter load high resistance and power theft detection circuit according to claim 2, wherein the a-phase detection circuit comprises resistors R1, R2, R3, a capacitor C1, diodes D1, D2 and a power control switch SCS1, wherein the power control switch SCS1 is built into the power meter:
the tenth wiring terminal of the electric energy meter is connected with the positive electrode of the diode D1 through the resistor R1, and is simultaneously connected with the third wiring terminal of the electric energy meter, and the negative electrode of the diode D1 is connected with one end of the resistor R2; the other end of the resistor R2 is connected with one end of the resistor R3 and is simultaneously connected with the ADC end of the A-phase metering chip; the other end of the resistor R3 is grounded; the two ends of the resistor R3 are connected with a capacitor C1 in parallel and used for filtering; the diode D2 is connected in parallel with the two ends of the resistor R3 and used for voltage stabilization protection;
B. the phase C detection circuit is consistent with the phase A.
4. The metering chip-based electric energy meter load high resistance and electricity theft detection circuit according to claim 2, wherein the capacitors C2, C4 and C6 are all cable parasitic capacitors.
5. The metering chip-based electric energy meter load high resistance and electricity theft detection circuit according to claim 2, wherein the resistors R1 and R2 are M omega-level resistors, and the resistor R3 is a k omega-level resistor.
6. The metering chip-based electric energy meter load high resistance and electricity theft detection circuit according to claim 2, wherein the resistors R1, R2 and R3 are respectively formed by connecting a plurality of resistors in series.
7. The metering chip-based electric energy meter load high resistance and electricity theft detection circuit according to claim 1, wherein the rated operating voltage of the electric energy meter is 230V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222995269.0U CN219348990U (en) | 2022-11-10 | 2022-11-10 | Electric energy meter load high resistance and electricity stealing detection circuit based on metering chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222995269.0U CN219348990U (en) | 2022-11-10 | 2022-11-10 | Electric energy meter load high resistance and electricity stealing detection circuit based on metering chip |
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| Publication Number | Publication Date |
|---|---|
| CN219348990U true CN219348990U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222995269.0U Active CN219348990U (en) | 2022-11-10 | 2022-11-10 | Electric energy meter load high resistance and electricity stealing detection circuit based on metering chip |
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| CN (1) | CN219348990U (en) |
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- 2022-11-10 CN CN202222995269.0U patent/CN219348990U/en active Active
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