CN201449417U - Electronic type electrical energy meter for metering full current - Google Patents
Electronic type electrical energy meter for metering full current Download PDFInfo
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- CN201449417U CN201449417U CN2009200393185U CN200920039318U CN201449417U CN 201449417 U CN201449417 U CN 201449417U CN 2009200393185 U CN2009200393185 U CN 2009200393185U CN 200920039318 U CN200920039318 U CN 200920039318U CN 201449417 U CN201449417 U CN 201449417U
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Abstract
The utility model relates to an electronic type electrical energy meter for metering full current and a metering method thereof. The electrical energy meter has the characteristics as follows: a sampling device of a current resistor and a sampling device of a current mutual inductor are connected in series at the same side of the load of a current loop of the electronic type electrical energy meter or at the same side of the load of a loop of an electricity meter; the characteristics of the sampling device of the current resistor, such as good linearity and reaction to all passed currents, are utilized fully to make up for the defect that the traditional current mutual inductor does not have reaction to direct current component; in addition, the phenomenon that the traditional three-phase and three-wire electrical energy meter omits metering a large quantity of electrical energy under the conditions of external adding direct current and alternating current magnetic field can be avoided. Aiming at various types of electrical energy meters for metering full current, the utility model provides corresponding methods and steps for comparing, judging and treating electrical energy metering data, the metering methods not only do not violate the metering principle of the existing electrical energy meter, but also fully play the unique roles of the electronic type electrical energy meter for metering full current, thus making up for and perfecting the electrical energy metering of the direct current component and even harmonic component of the current flowing through each loop of the electrical energy meter, and being capable of effectively restraining technology electricity stealing.
Description
Technical field
The utility model relates to a kind of electric power meter, electric instrument such as especially a kind of single, three-phase electric energy meter that can comprehensively measure all active energies and reactive energy and three-phase multifunctional electrical energy meter, three-phase load controller, three-phase distribution transforming measuring instrument.
Background technology
At present, electric instrument majorities such as domestic three phases electronic energy meter and three-phase electronic multifunctional electric energy meter are to adopt the sampling device of current transformer (CT) as tested electric current, the current transformer sampling device has the high characteristics of sampling precision, but, still there is following the defective that is difficult to remedy in the current transformer sampling device, (1) according to Faraday's electromagnetic induction law, the current transformer sampling device is the DC component that can't detect the measurement loop of flowing through, thereby can leak meter by DC component produced in the electric current power consumption, in the actual power utilization environment of China, the kind of the electrical appliance of employing half-wave rectification is very many, as: common controllable silicon light modulation desk lamp in the daily life, hair dryer, electric cooker, the chamber type electric resistance furnace of using always in the commercial production, equipment such as heating furnace all adopt the half-wave rectification mode to carry out the control of electric current and power.Also clearly be defined in the existing at home and abroad product standard under even-order harmonic (DC component) state and must not leak the meter electric energy, stipulate as the 8.2.3 bar among standard GB/T17215.321-2008 (being equal to IEC 62053.21-2003): promptly be judged to be defective above 3%, and the existing three-phase through type electric energy meter error maximum of current transformer sampling device manufacturing of utilizing can reach about 50%, leak the meter electric energy and far surpass set quota, the through type three-phase four-wire system electric energy meter that causes existing enterprise to produce is in large quantities of defective states.(2) the current transformer sampling device adopts be on the metal iron core coiling once with the structure of secondary coil, when external dc and AC magnetic field, the magnetization that the metal iron core is subjected to externally-applied magnetic field can produce saturation magnetic field and reduce the generation of induced signal, leak a large amount of electric energy of meter, the lawless person uses the method always, and three-phase three-wire system high pressure measurement electric energy meter and three-phase four-wire system mutual inductance type metering electric energy meter are implemented the stealing electric energy and be difficult to discovery.
The utility model content
The utility model purpose is to the unmeasurable defective of the DC component of the measurement loop of flowing through at existing current transformer sampling electric energy meter, auxilliary current sense resistor sampling device and corresponding ic for energy metering, to remedy the deficiency that conventional current mutual inductor sampling device can not respond DC component, simultaneously the sampled signal that is collected on two kinds of sampling devices is compared, judge, quantifying is handled and is judged output, realize the error judgment of two kinds of current sampling signals and detection certainly, reach the purpose of under even-order harmonic DC component state, not leaking the meter electric energy, simultaneously, error ratio by two current sampling devices, realize that self check has improved the reliability of electric energy metrical, and effectively prevent various stealings.
For achieving the above object, the utility model provides technical scheme, the circuital electronic electric energy meter of described metering, its composition includes, electric energy meter housing, terminal, current transformer sampling device, current sense resistor sampling device, ic for energy metering, electric energy measurement data treatment circuit, electric energy metrical display circuit is characterized in that: described current sense resistor sampling device and current transformer sampling device are serially connected with the load the same side of current return or the load the same side in ammeter loop.
In the utility model overall technological scheme, at the three-phase and four-line electric energy meter, the A that described current sense resistor sampling device and current transformer sampling device are serially connected with three-phase electric energy meter is loop, B phase loop, C phase loop load the same side separately mutually.
In above-mentioned three-phase and four-line electric energy meter technical scheme, A phase current in loop resistor sampled signal summation current transformer sampled signal is imported A single-phase electric energy metering circuit simultaneously, B phase current in loop resistor sampled signal summation current transformer sampled signal is imported B single-phase electric energy metering circuit simultaneously, C phase current in loop resistor sampled signal summation current transformer sampled signal is imported C single-phase electric energy metering circuit simultaneously, A single-phase electric energy metering circuit, B single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit is sent into single-chip microcomputer and is handled. and the metering method characteristics of this three-phase and four-line electric energy meter are, at three-phase and four-line electric energy meter each phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in this each loop of flowing through simultaneously, current transformer sampled signal that each phase loop sampling obtains and current sense resistor sampled signal input to respectively in each single-phase metering circuit and compare, select current transformer sampled signal or the current sense resistor sampled signal that current value is bigger in each phase loop and carry out data quantifying processing, quantifying data after again each single-phase metering circuit being handled are sent into single-chip microcomputer, and each phase loop continuous data of three-phase and four-line electric energy meter outputs to the electric energy metrical display circuit after the overlap-add procedure in single-chip microcomputer. and this three-phase and four-line electric energy meter can detect and measure flow through in the threephase load loop DC component or the formed power consumption of even-order harmonic component of electric current.
In above-mentioned three-phase and four-line electric energy meter technical scheme, A phase current in loop resistor sampled signal input A single-phase electric energy metering circuit, B phase current in loop resistor sampled signal input B single-phase electric energy metering circuit, C phase current in loop resistor sampled signal input C single-phase electric energy metering circuit, and A phase loop, B phase loop and C current in loop mutual inductor sampled signal mutually import same three phase metering circuit, A phase ic for energy metering simultaneously, B phase ic for energy metering, the continuous data signal of C phase ic for energy metering and three-phase electric energy metering circuit is all sent into single-chip microcomputer and is handled.The metering method characteristics of this three-phase and four-line electric energy meter are, at three-phase and four-line electric energy meter each phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, and each phase current in loop resistor sampled signal inputed to respectively in each single-phase metering circuit, and each phase current in loop mutual inductor sampled signal is input in the same three phase metering circuit, in this three phase metering circuit, each phase current mutual inductor sampled signal carries out outputing in the single-chip microcomputer after the overlap-add procedure, synchronous therewith, the quantifying data of each single-phase metering circuit also output to single-chip microcomputer, single-chip microcomputer will superpose from the continuous data of each single-phase metering circuit and compare with continuous data from the three phase metering circuit, get bigger continuous data between the two and output to the electric energy metrical display circuit.This three-phase and four-line electric energy meter can detect and measure flow through in the threephase load loop DC component or the formed power consumption of even-order harmonic component of electric current.
In the utility model overall technological scheme, at the three-phase and four-line electric energy meter, the A that described current sense resistor sampling device and current transformer sampling device are serially connected with the three-phase and four-line electric energy meter is loop, B phase loop, C phase loop load the same side separately mutually, and described current sense resistor sampling device and current transformer sampling device also are serially connected with this three-phase and four-line electric energy meter N mutually in the loop.
In above-mentioned three-phase and four-line electric energy meter technical scheme, A phase current in loop resistor sampled signal summation current transformer sampled signal is imported A single-phase electric energy metering circuit simultaneously, B phase current in loop resistor sampled signal summation current transformer sampled signal is imported B single-phase electric energy metering circuit simultaneously, C phase current in loop resistor sampled signal summation current transformer sampled signal is imported C single-phase electric energy metering circuit simultaneously, N phase current in loop resistor sampled signal summation current transformer sampled signal is imported N single-phase electric energy metering circuit simultaneously, A single-phase electric energy metering circuit, B single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit and the single-phase metering circuit of N is sent into single-chip microcomputer and is handled. and the metering method characteristics of this three-phase and four-line electric energy meter are, in each phase load the same side of three-phase and four-line electric energy meter and zero line, all be connected in series current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in this each loop of flowing through simultaneously, compare in the single-phase metering circuit that current transformer sampled signal that each loop sampling obtains and current sense resistor sampled signal input to each phase line respectively and the single-phase metering circuit of zero line, select current transformer sampled signal or the current sense resistor sampled signal that current value is bigger in each phase loop and the zero line and carry out data quantifying processing, again each single-phase metering circuit quantifying data are sent into single-chip microcomputer and carry out overlap-add procedure, output to the electric energy metrical display circuit again, when the three-phase circuit load balance, in the zero line the sampling current signal can not appear, and when the three-phase circuit load imbalance, in the zero line then the sampling current signal can appear, the zero line metering circuit of this moment is selected bigger current transformer sampled signal of marking current value or current sense resistor sampled signal, and bigger sampled signal carried out also outputing to single-chip microcomputer simultaneously after quantifying is handled, at this moment, single-chip microcomputer can carry out the continuous data of three-phase and four-line electric energy meter phase line loop and zero line to output to the electric energy meter display circuit after the overlap-add procedure. power consumption when this three-phase and four-line electric energy meter can detect and measure three-phase electricity consumption non-equilibrium state.
In above-mentioned three-phase and four-line electric energy meter technical scheme, A phase current in loop resistor sampled signal input A single-phase electric energy metering circuit, B phase current in loop resistor sampled signal input B single-phase electric energy metering circuit, C phase current in loop resistor sampled signal input C single-phase electric energy metering circuit, the single-phase metering circuit of N phase current in loop resistor sampled signal input N, and A phase loop, B phase loop, C phase loop and N current in loop mutual inductor sampled signal mutually import same three phase metering circuit, A single-phase electric energy metering circuit simultaneously, B single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit and three-phase electric energy metering circuit is all sent into single-chip microcomputer and is handled.The metering method characteristics of this three-phase and four-line electric energy meter are, in each phase load the same side of three-phase and four-line electric energy meter and zero line, all be connected in series current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in this each loop of flowing through simultaneously, compare in the single-phase metering circuit that current transformer sampled signal that each loop sampling obtains and current sense resistor sampled signal input to each phase line respectively and the single-phase metering circuit of zero line, select current transformer sampled signal or the current sense resistor sampled signal that current value is bigger in each phase loop and the zero line and carry out data quantifying processing, again each single-phase metering circuit quantifying data are sent into single-chip microcomputer and carry out overlap-add procedure, output to the electric energy meter display circuit again, when the three-phase circuit load balance, in the zero line the sampling current signal can not appear, and when the three-phase circuit load imbalance, in the zero line then the sampling current signal can appear, the zero line metering circuit of this moment is selected bigger current transformer sampled signal of marking current value or current sense resistor sampled signal, and bigger sampled signal carried out also outputing to single-chip microcomputer simultaneously after quantifying is handled, at this moment, single-chip microcomputer can carry out the continuous data of three-phase and four-line electric energy meter phase line loop and zero line to output to the electric energy metrical display circuit after the overlap-add procedure.Power consumption when this three-phase and four-line electric energy meter can detect and measure three-phase electricity consumption non-equilibrium state.
In the utility model overall technological scheme, at three-phase three-wire electric energy meter, the A that described current sense resistor sampling device and current transformer sampling device are serially connected with three-phase electric energy meter is loop and C phase loop load the same side separately mutually.
In above-mentioned three-phase three-wire electric energy meter technical scheme, A phase current in loop resistor sampled signal summation current transformer sampled signal is imported A single-phase electric energy metering circuit simultaneously, C phase current in loop resistor sampled signal summation current transformer sampled signal is imported C single-phase electric energy metering circuit simultaneously, A single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit is sent into single-chip microcomputer and is handled, B phase loop current is also directly sent into single-chip microcomputer. and the metering method characteristics of this three-phase three-wire electric energy meter are, at three-phase three-wire electric energy meter A phase and C phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in this each loop of flowing through simultaneously, A mutually and C the current transformer sampled signal of loop sampling acquisition and current sense resistor sampled signal input to respectively in single-phase metering circuit of A and the single-phase metering circuit of C and compare mutually, select A mutually and C mutually in the loop bigger current transformer sampled signal or the current sense resistor sampled signal of current value carry out data quantifying processing, again the quantifying data after single-phase metering circuit of A and the single-phase metering circuit processing of C are sent into single-chip microcomputer, and the B phase current is directly sent into single-chip microcomputer, three-phase three-wire electric energy meter A phase loop and the C continuous data in loop mutually superpose in single-chip microcomputer and output to the electric energy metrical display circuit after (algebraic sum) handled, and the B phase current is not used in metering, whether three line currents that only are used to judge electric energy meter balance, can point out the state of electric leakage or some stealing. this three-phase three-wire electric energy meter can effectively be avoided external dc and alternating magnetic field, three-phase three-wire electric energy meter leaks the phenomenon of a large amount of electric energy of meter, and three-phase three-wire system high pressure measurement electric energy meter technology electricity filching behavior is in time found and effectively containment.
In above-mentioned three-phase three-wire electric energy meter technical scheme, A phase current in loop resistor sampled signal input A single-phase electric energy metering circuit, C phase current in loop resistor sampled signal input C single-phase electric energy metering circuit, and A phase loop and C mutually current in loop mutual inductor sampled signal import same three phase metering circuit simultaneously, the continuous data signal of A phase ic for energy metering, C phase ic for energy metering and three-phase electric energy metering circuit is all sent into single-chip microcomputer and is handled, and B phase loop also is directly connected in single-chip microcomputer.The metering method characteristics of this three-phase three-wire electric energy meter are, at three-phase three-wire electric energy meter A phase and C phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, and A phase current in loop resistor sampled signal inputed in the single-phase metering circuit of A, C phase current in loop resistor sampled signal is inputed in the single-phase metering circuit of C, and with A mutually with C mutually current in loop mutual inductor sampled signal be input in the same three phase metering circuit, in this three phase metering circuit, A phase and C phase current mutual inductor sampled signal carry out outputing in the single-chip microcomputer after the overlap-add procedure, synchronous therewith, the quantifying data of single-phase metering circuit of A and the single-phase metering circuit of C also output to single-chip microcomputer, B phase loop current is also directly sent into single-chip microcomputer, single-chip microcomputer will compare from the continuous data of the single-phase metering circuit of A and continuous data from the three phase metering circuit, get bigger continuous data between the two and output to the electric energy metrical display circuit, B phase loop current is not used in metering, and the electric current that is used to judge three lines balance whether can be pointed out the state of electric leakage or some stealing.This three-phase three-wire electric energy meter can effectively be avoided external dc and alternating magnetic field, and three-phase three-wire electric energy meter leaks the phenomenon of a large amount of electric energy of meter, and three-phase three-wire system high pressure measurement electric energy meter technology electricity filching behavior is in time found and effectively containment.
In the utility model overall technological scheme, at single-phase electric energy meter, described current sense resistor sampling device and current transformer sampling device are serially connected with single-phase electric energy meter L mutually in the loop, L phase current in loop resistor sampled signal summation current transformer sampled signal is imported the single-phase electric energy metering circuit simultaneously, and the metering signal of this single-phase electric energy metering circuit is directly sent into the metering display circuit.These single-phase electric energy meter metering method characteristics are, at single-phase electric energy meter live wire load the same side serial connection current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in the live wire loop of flowing through simultaneously, current transformer sampled signal that the sampling of live wire loop obtains and current sense resistor sampled signal input in the same single-phase metering circuit and compare, and select bigger current transformer sampled signal of current value or current sense resistor sampled signal and carry out directly outputing to the single-phase electric energy meter display circuit after the data quantifying is handled.This single-phase electric energy meter can detect and measure flow through in the L phase loop DC component or the formed power consumption of even-order harmonic component of electric current.
In the utility model overall technological scheme, at single-phase anti-electricity-theft electric energy meter, described current sense resistor sampling device and current transformer sampling device are serially connected with single-phase electric energy meter L mutually in loop and the N phase loop, L phase current in loop resistor sampled signal summation current transformer sampled signal is imported L single-phase electric energy metering circuit simultaneously, N phase current in loop resistor sampled signal summation current transformer sampled signal is imported N single-phase electric energy metering circuit simultaneously, and the metering signal of L single-phase electric energy metering circuit and N single-phase electric energy metering circuit is sent into single-chip microcomputer and handled.These single-phase anti-electricity-theft electric energy meter metering method characteristics are, in single-phase electric energy meter live wire load the same side and ground wire, all be connected in series current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in the live wire loop of flowing through simultaneously, current transformer sampled signal and current sense resistor sampled signal that the sampling of live wire loop obtains input in the live wire metering circuit, current transformer sampled signal and current sense resistor sampled signal that the earth loop sampling obtains input in the ground wire metering circuit, live wire metering circuit and ground wire metering circuit be current input signal value more separately respectively, select bigger current transformer sampled signal of current value or current sense resistor sampled signal and carry out being sent to single-chip microcomputer after the data quantifying is handled, single-chip microcomputer carries out the continuous data of live wire metering circuit and the continuous data of ground wire metering circuit to output to the electric energy meter display circuit again after the overlap-add procedure.This single-phase anti-electricity-theft electric energy meter can detect and measure actual power consumption under the live wire ground wire reversal connection stealing state.
In above-mentioned all three-phase electric energy meters and single-phase electric energy meter technical scheme, described current sense resistor sampling device is copper-manganese resistance or constantan resistance.
The utility model has the advantages that, made full use of current sense resistor sampling device good linearity, to all electric currents of flowing through all to some extent the reaction characteristics, itself and current transformer sampling device be serially connected with the same side of loop load mutually, place, effectively remedied the conventional current mutual inductor flowing through its responseless defective of DC component.Technical solutions of the utility model are applied in traditional three-phase and four-line electric energy meter, handle respectively by mutual inductor sampled signal and resistor sampled signal each phase loop, gather judgement, the adjustment of data can effectively overcome the leakage metering phenomenon of existing three-phase and four-line electric energy meter to DC component.Technical solutions of the utility model are applied in traditional three-phase three-wire electric energy meter, can avoid traditional three-phase three-wire electric energy meter under external dc and AC magnetic field situation, to leak the phenomenon of a large amount of electric energy of meter, thereby effectively contain the technology stealing.The utility model is at metering total current electronic electric energy meter unique texture, given metering method, without prejudice to existing electric energy meter measurement principle, give full play to the original effect of metering total current electronic electric energy meter that the utility model provides simultaneously, thereby remedy and perfect, and effectively be contained in technology stealing on all kinds of single, the three-phase electric energy meters the DC component of each loop current of electric energy meter of flowing through and the electric energy metrical of even-order harmonic component.
Description of drawings
Fig. 1 is that the utility model can measure one of total current three-phase electric energy meter circuit structure form synoptic diagram.
Fig. 2 is two synoptic diagram that the utility model can measure total current three-phase electric energy meter circuit structure form.
Fig. 3 is three synoptic diagram that the utility model can measure total current three-phase electric energy meter circuit structure form.
Fig. 4 is four synoptic diagram that the utility model can measure total current three-phase electric energy meter circuit structure form.
Fig. 5 is five synoptic diagram that the utility model can measure total current three-phase electric energy meter circuit structure form.
Fig. 6 is six synoptic diagram that the utility model can measure total current three-phase electric energy meter circuit structure form.
Fig. 7 is that the utility model can measure one of total current single-phase electric energy meter circuit structure form synoptic diagram.
Fig. 8 is two synoptic diagram that the utility model can measure total current single-phase electric energy meter circuit structure form.
In the above accompanying drawing, the 101st, single-chip microcomputer, the 102nd, the single-phase computation chip of A, the 103rd, the single-phase computation chip of B, the 104th, the single-phase computation chip of C, the 105th, A phase current resistance and electric current mutual inductance sampling device, the 106th, B phase current resistance and electric current mutual inductance sampling device, the 107th, C phase current resistance and electric current mutual inductance sampling device, the 108th, threephase load, the 201st, single-chip microcomputer, the 202nd, the three phase metering chip, the 203rd, the single-phase computation chip of A, the 204th, the single-phase computation chip of B, the 205th, the single-phase computation chip of C, the 206th, A phase current resistance and electric current mutual inductance sampling device, the 207th, B phase current resistance and electric current mutual inductance sampling device, the 208th, C phase current resistance and electric current mutual inductance sampling device, the 209th, threephase load, the 301st, single-chip microcomputer, the 302nd, the single-phase computation chip of A, the 303rd, the single-phase computation chip of B, the 304th, the single-phase computation chip of C, the 305th, the single-phase computation chip of N, the 306th, A phase current resistance and electric current mutual inductance sampling device, the 307th, B phase current resistance and electric current mutual inductance sampling device, the 308th, C phase current resistance and electric current mutual inductance sampling device, the 309th, N phase current resistance and electric current mutual inductance sampling device, the 310th, threephase load, the 401st, single-chip microcomputer, the 402nd, the three phase metering chip, the 403rd, the single-phase computation chip of A, the 404th, the single-phase computation chip of B, the 405th, the single-phase computation chip of C, the 406th, the single-phase computation chip of N, the 407th, A phase current resistance and electric current mutual inductance sampling device, the 408th, B phase current resistance and electric current mutual inductance sampling device, the 409th, C phase current resistance and electric current mutual inductance sampling device, the 410th, N phase current resistance and electric current mutual inductance sampling device, the 411st, threephase load, the 501st, single-chip microcomputer, the 502nd, the single-phase computation chip of A, the 503rd, the single-phase computation chip of C, the 504th, A phase current resistance and electric current mutual inductance sampling device, the 505th, C phase current resistance and electric current mutual inductance sampling device, the 506th, load, the 601st, single-chip microcomputer, the 502nd, three phase metering chip, the single-phase computation chip of 603A, the 604th, the single-phase computation chip of C, the 605th, A phase current resistance and electric current mutual inductance sampling device, the 606th, C phase current resistance and electric current mutual inductance sampling device, the 607th, load, the 701st, single-chip microcomputer, the 702nd, the single-phase computation chip of L, the 703rd, L phase current resistance and electric current mutual inductance sampling device, the 801st, single-chip microcomputer, the 802nd, the single-phase computation chip of L, the 803rd, the single-phase computation chip of N, the 804th, L phase current resistance and electric current mutual inductance sampling device, the 805th, N phase current resistance and electric current mutual inductance sampling device.
Specific embodiment
Below in conjunction with accompanying drawing, introduce specific embodiment of the utility model.
Embodiment one: present embodiment is the three-phase and four-line electric energy meter, and its circuit is formed structure as shown in Figure 1.Wherein, single-phase computation chip is selected AD7761 for use, and single-chip microcomputer is selected PIC16F630 for use.
In present embodiment one, when this three-phase and four-line electric energy meter dispatches from the factory debugging, each phase current resistor sampled signal is arranged to negative error, like this, under the power consumption situation that does not all have DC component in the three-phase loop load, what three-phase electric energy meter showed is the electric energy measurement data of current transformer sampled signal after metering circuit is handled, when in a phase loop load or heterogeneous loop load are arranged in the three-phase loop load, having the load of DC component power consumption, the current sense resistor sampled signal then significant change can occur, the current transformer sampled signal carries out the comparison of current value size in current sense resistor sampled signal and the same loop in computation chip this moment, select the marking current value bigger send into single-chip microcomputer, single-chip microcomputer is exported to the electric energy metrical display circuit after each computation chip data is carried out overlap-add procedure again.At this moment, it is the whole electric currents of this three-phase electric energy meter of flowing through that electric energy metrical shows, the power consumption variable of (i.e. all electric currents under idol, odd harmonic state).
Embodiment two: present embodiment still is the three-phase and four-line electric energy meter, and its circuit is formed structure as shown in Figure 2.Wherein, single-phase computation chip is selected AD7761 for use, and the three phase metering chip is selected AD7752 for use, and single-chip microcomputer is selected PIC16F630 for use.
In the present embodiment two, three-phase and four-line electric energy meter each phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, each phase current in loop resistor sampled signal inputs to respectively in each single-phase metering circuit, and each phase current in loop mutual inductor sampled signal is input in the same three phase metering circuit, in this three phase metering circuit, each phase current mutual inductor sampled signal carries out outputing in the single-chip microcomputer after the overlap-add procedure, synchronous therewith, the quantifying data of each single-phase metering circuit also output to single-chip microcomputer, single-chip microcomputer will superpose from the continuous data of each single-phase metering circuit and compare with continuous data from the three phase metering circuit, get bigger continuous data between the two and output to the electric energy metrical display circuit.
Embodiment three: present embodiment is the three-phase and four-line electric energy meter, and its circuit is formed structure as shown in Figure 3.Wherein, single-phase computation chip is selected AD7761 for use, and single-chip microcomputer is selected PIC16F630 for use.
In the present embodiment three, all be connected in series current transformer sampling device and current sense resistor sampling device in each phase load the same side of three-phase and four-line electric energy meter and the zero line, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in this each loop of flowing through simultaneously, compare in the single-phase metering circuit that current transformer sampled signal that each loop sampling obtains and current sense resistor sampled signal input to each phase line respectively and the single-phase metering circuit of zero line, when product export is debugged, in advance each phase current resistor sampled signal is arranged to negative error, like this, under the power consumption situation that does not all have DC component in the three-phase loop load, what three-phase electric energy meter showed is the electric energy measurement data of current transformer sampled signal after metering circuit is handled, when in a phase loop load or heterogeneous loop load are arranged in the three-phase loop load, having the load of DC component power consumption, the current sense resistor sampled signal then significant change can occur, the current transformer sampled signal carries out the comparison of current value size in current sense resistor sampled signal and the same loop in computation chip this moment, select current transformer sampled signal or the current sense resistor sampled signal that current value is bigger in each phase loop and the zero line and carry out data quantifying processing, again each single-phase metering circuit quantifying data are sent into single-chip microcomputer and carry out overlap-add procedure, output to the electric energy meter display circuit again, when the three-phase circuit load balance, in the zero line the sampling current signal can not appear, and when the three-phase circuit load imbalance, in the zero line then the sampling current signal can appear, the zero line metering circuit of this moment is selected bigger current transformer sampled signal of marking current value or current sense resistor sampled signal, and bigger sampled signal carried out also outputing to single-chip microcomputer simultaneously after quantifying is handled, at this moment, single-chip microcomputer can carry out the continuous data of three-phase epiphase line loop and zero line to output to the electric energy meter display circuit after the overlap-add procedure.
Embodiment four: present embodiment still is the three-phase and four-line electric energy meter, and its circuit is formed structure as shown in Figure 4.Wherein, single-phase computation chip is selected AD7761 for use, and the three phase metering chip is selected AD7752 for use, and single-chip microcomputer is selected PIC 16F630 for use.
In the present embodiment four, in each phase load the same side of three-phase and four-line electric energy meter and zero line, all be connected in series current transformer sampling device and current sense resistor sampling device, and the current sense resistor sampled signal in each phase loop and the zero line inputed to respectively in each single-phase metering circuit and the zero line metering circuit, and the current transformer sampled signal in each phase loop and the zero line is input in the same three phase metering circuit, in this three phase metering circuit, current transformer sampled signal in each phase line and the zero line carries out outputing in the single-chip microcomputer after the overlap-add procedure, synchronous therewith, the quantifying data of each single-phase metering circuit and zero line metering circuit also output to single-chip microcomputer, single-chip microcomputer will superpose from the continuous data of each single-phase metering circuit and zero line metering circuit and compare with continuous data from the three phase metering circuit, get bigger continuous data between the two and output to the electric energy metrical display circuit.
Embodiment five: present embodiment is a three-phase three-wire electric energy meter, and its circuit is formed structure as shown in Figure 5, and wherein, single-phase computation chip is selected AD7761 for use, and single-chip microcomputer is selected PIC16F630 for use.
In the present embodiment five, three-phase three-wire electric energy meter A phase and C phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in this each loop of flowing through simultaneously, A mutually and C the current transformer sampled signal of loop sampling acquisition and current sense resistor sampled signal input to respectively in single-phase metering circuit of A and the single-phase metering circuit of C and compare mutually, select A mutually and C mutually in the loop bigger current transformer sampled signal or the current sense resistor sampled signal of current value carry out data quantifying processing, again the quantifying data after single-phase metering circuit of A and the single-phase metering circuit processing of C are sent into single-chip microcomputer, and the B phase current is directly sent into single-chip microcomputer, three-phase three-wire electric energy meter A phase loop and the C continuous data in loop mutually superpose in single-chip microcomputer and output to the electric energy metrical display circuit after (algebraic sum) handled, and the B phase current is not used in metering, whether three line currents that only are used to judge electric energy meter balance, can point out the state of electric leakage or some stealing.This three-phase three-wire electric energy meter can effectively be avoided external dc and alternating magnetic field, and three-phase three-wire electric energy meter leaks the phenomenon of a large amount of electric energy of meter, and three-phase three-wire system high pressure measurement electric energy meter technology electricity filching behavior is in time found and effectively containment.
Embodiment six: present embodiment is a three-phase three-wire electric energy meter, and its circuit is formed structure as shown in Figure 6, and wherein, single-phase computation chip is selected AD7761 for use, and the three phase metering chip is selected AD7752 for use, and single-chip microcomputer is selected PIC16F630 for use.
In the present embodiment six, three-phase three-wire electric energy meter A phase and C phase load the same side serial connection current transformer sampling device and current sense resistor sampling device, and A phase current in loop resistor sampled signal inputed in the single-phase metering circuit of A, C phase current in loop resistor sampled signal is inputed in the single-phase metering circuit of C, and with A mutually with C mutually current in loop mutual inductor sampled signal be input in the same three phase metering circuit, in this three phase metering circuit, A phase and C phase current mutual inductor sampled signal carry out outputing in the single-chip microcomputer after the overlap-add procedure, synchronous therewith, the quantifying data of single-phase metering circuit of A and the single-phase metering circuit of C also output to single-chip microcomputer, B phase loop current is also directly sent into single-chip microcomputer, single-chip microcomputer will compare from the continuous data of the single-phase metering circuit of A and continuous data from the three phase metering circuit, get bigger continuous data between the two and output to the electric energy metrical display circuit, B phase loop current is not used in metering, and the electric current that is used to judge three lines balance whether can be pointed out the state of electric leakage or some stealing.This three-phase three-wire electric energy meter can effectively be avoided external dc and alternating magnetic field, and three-phase three-wire electric energy meter leaks the phenomenon of a large amount of electric energy of meter, and three-phase three-wire system high pressure measurement electric energy meter technology electricity filching behavior is in time found and effectively containment.
Embodiment seven: present embodiment is single-phase common electric energy meter, and its circuit is formed structure as shown in Figure 7.Wherein, single-phase computation chip is selected AD7761 for use.
In the present embodiment seven, at single-phase electric energy meter live wire load the same side serial connection current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in the live wire loop of flowing through simultaneously, current transformer sampled signal that the sampling of live wire loop obtains and current sense resistor sampled signal input in the same single-phase metering circuit and compare, when this single-phase electric energy meter dispatches from the factory debugging, the current sense resistor sampled signal is arranged to negative error, like this, under the power consumption situation that does not have DC component in the load circuit, what single-phase electric energy meter showed is the electric energy measurement data of current transformer sampled signal after metering circuit is handled, when having the load of DC component power consumption in the load circuit, the current sense resistor sampled signal then significant change can occur, current sense resistor sampled signal and current transformer sampled signal carry out the comparison of current value size in computation chip this moment, and select the bigger current transformer sampled signal of current value or current sense resistor sampled signal and carry out directly outputing to after the data quantifying is handled single-phase electric energy metering display circuit.
Embodiment eight: present embodiment is single-phase anti-electricity-theft electric energy meter, and its circuit is formed structure as shown in Figure 8.Wherein, single-phase computation chip is selected AD7761 for use, and single-chip microcomputer is selected PIC16F630 for use.
In the present embodiment eight, in single-phase electric energy meter live wire load the same side and ground wire, all be connected in series current transformer sampling device and current sense resistor sampling device, current transformer sampling device and current sense resistor sampling device are taken a sample to the electric current in the live wire loop of flowing through simultaneously, current transformer sampled signal and current sense resistor sampled signal that the sampling of live wire loop obtains input in the live wire metering circuit, current transformer sampled signal and current sense resistor sampled signal that the earth loop sampling obtains input in the ground wire metering circuit, when this single-phase anti-electricity-theft electric energy meter dispatches from the factory debugging, the current sense resistor sampled signal is arranged to negative error, like this, under the power consumption situation that does not have DC component in live wire load circuit and the earth loop, what this single-phase anti-electricity-theft electric energy meter showed is the electric energy measurement data of current transformer sampled signal after metering circuit is handled, when the live wire load circuit and (or) when having the load of DC component power consumption in the ground wire load circuit, the current sense resistor sampled signal then significant change can occur, current sense resistor sampled signal and current transformer sampled signal carry out the comparison of current value size in live wire computation chip and ground wire computation chip this moment, select bigger current transformer sampled signal of current value or current sense resistor sampled signal and carry out being sent to single-chip microcomputer after the data quantifying is handled, single-chip microcomputer carries out the continuous data of live wire metering circuit and the continuous data of ground wire metering circuit to output to the electric energy metrical display circuit again after the overlap-add procedure.
Claims (13)
1. one kind is measured circuital electronic electric energy meter, its composition includes, electric energy meter housing, terminal, current transformer sampling device, current sense resistor sampling device, ic for energy metering, electric energy measurement data treatment circuit, electric energy metrical display circuit is characterized in that: described current sense resistor sampling device and current transformer sampling device are serially connected with the load the same side of current return or the load the same side in ammeter loop.
2. the circuital electronic electric energy meter of a kind of metering according to claim 1 is characterized in that: the A that described current sense resistor sampling device and current transformer sampling device are serially connected with three-phase electric energy meter is loop, B phase loop, C phase loop load the same side separately mutually.
3. the circuital electronic electric energy meter of a kind of metering according to claim 2, it is characterized in that: A phase current in loop resistor sampled signal summation current transformer sampled signal is imported A single-phase electric energy metering circuit simultaneously, B phase current in loop resistor sampled signal summation current transformer sampled signal is imported B single-phase electric energy metering circuit simultaneously, C phase current in loop resistor sampled signal summation current transformer sampled signal is imported C single-phase electric energy metering circuit, A single-phase electric energy metering circuit simultaneously, B single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit is sent into single-chip microcomputer and is handled.
4. the circuital electronic electric energy meter of a kind of metering according to claim 2, it is characterized in that: A phase current in loop resistor sampled signal input A single-phase electric energy metering circuit, B phase current in loop resistor sampled signal input B single-phase electric energy metering circuit, C phase current in loop resistor sampled signal input C single-phase electric energy metering circuit, and A phase loop, B phase loop and C current in loop mutual inductor sampled signal mutually import same three phase metering circuit, A phase ic for energy metering simultaneously, B phase ic for energy metering, the continuous data signal of C phase ic for energy metering and three-phase electric energy metering circuit is all sent into single-chip microcomputer and is handled.
5. the circuital electronic electric energy meter of a kind of metering according to claim 1, it is characterized in that: the A that described current sense resistor sampling device and current transformer sampling device are serially connected with three-phase electric energy meter is loop, B phase loop, C phase loop load the same side separately mutually, and described current sense resistor sampling device and current transformer sampling device also are serially connected with this three-phase electric energy meter N mutually in the loop.
6. the circuital electronic electric energy meter of a kind of metering according to claim 5, it is characterized in that: A phase current in loop resistor sampled signal summation current transformer sampled signal is imported A single-phase electric energy metering circuit simultaneously, B phase current in loop resistor sampled signal summation current transformer sampled signal is imported B single-phase electric energy metering circuit simultaneously, C phase current in loop resistor sampled signal summation current transformer sampled signal is imported C single-phase electric energy metering circuit simultaneously, N phase current in loop resistor sampled signal summation current transformer sampled signal is imported N single-phase electric energy metering circuit, A single-phase electric energy metering circuit simultaneously, B single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit and the single-phase metering circuit of N is sent into single-chip microcomputer and is handled.
7. the circuital electronic electric energy meter of a kind of metering according to claim 5, it is characterized in that: A phase current in loop resistor sampled signal input A single-phase electric energy metering circuit, B phase current in loop resistor sampled signal input B single-phase electric energy metering circuit, C phase current in loop resistor sampled signal input C single-phase electric energy metering circuit, the single-phase metering circuit of N phase current in loop resistor sampled signal input N, and A phase loop, B phase loop, C phase loop and N current in loop mutual inductor sampled signal mutually import same three phase metering circuit, A single-phase electric energy metering circuit simultaneously, B single-phase electric energy metering circuit, the continuous data signal of C single-phase electric energy metering circuit and three-phase electric energy metering circuit is all sent into single-chip microcomputer and is handled.
8. the circuital electronic electric energy meter of a kind of metering according to claim 1 is characterized in that: the A that described current sense resistor sampling device and current transformer sampling device are serially connected with three-phase electric energy meter is loop and C phase loop load the same side separately mutually.
9. the circuital electronic electric energy meter of a kind of metering according to claim 8, it is characterized in that: A phase current in loop resistor sampled signal summation current transformer sampled signal is imported A single-phase electric energy metering circuit simultaneously, C phase current in loop resistor sampled signal summation current transformer sampled signal is imported C single-phase electric energy metering circuit simultaneously, the continuous data signal of A single-phase electric energy metering circuit, C single-phase electric energy metering circuit is sent into single-chip microcomputer and is handled, and B phase loop is directly connected in single-chip microcomputer.
10. the circuital electronic electric energy meter of a kind of metering according to claim 8, it is characterized in that: A phase current in loop resistor sampled signal input A single-phase electric energy metering circuit, C phase current in loop resistor sampled signal input C single-phase electric energy metering circuit, and A phase loop and C mutually current in loop mutual inductor sampled signal import same three phase metering circuit simultaneously, the continuous data signal of A phase ic for energy metering, C phase ic for energy metering and three-phase electric energy metering circuit is all sent into single-chip microcomputer and is handled, and B phase loop also is directly connected in single-chip microcomputer.
11. the circuital electronic electric energy meter of a kind of metering according to claim 1, it is characterized in that: described current sense resistor sampling device and electric current mutual inductance sampling device are serially connected with single-phase electric energy meter L mutually in the loop, L phase current in loop resistor sampled signal summation current transformer sampled signal is imported the single-phase electric energy metering circuit simultaneously, and the metering signal of this single-phase electric energy metering circuit is sent into single-chip microcomputer and handled.
12. the circuital electronic electric energy meter of a kind of metering according to claim 1, it is characterized in that: described current sense resistor sampling device and current transformer sampling device are serially connected with single-phase electric energy meter L mutually in loop and the N phase loop, L phase current in loop resistor sampled signal summation current transformer sampled signal is imported L single-phase electric energy metering circuit simultaneously, N phase current in loop resistor sampled signal summation current transformer sampled signal is imported N single-phase electric energy metering circuit simultaneously, and the metering signal of L single-phase electric energy metering circuit and N single-phase electric energy metering circuit is sent into single-chip microcomputer and handled.
13. according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or the 11 or 12 circuital electronic electric energy meters of described a kind of metering, it is characterized in that: described current sense resistor sampling device is copper-manganese resistance or constantan resistance.
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| CN2009200393185U CN201449417U (en) | 2009-05-06 | 2009-05-06 | Electronic type electrical energy meter for metering full current |
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| CN2009200393185U CN201449417U (en) | 2009-05-06 | 2009-05-06 | Electronic type electrical energy meter for metering full current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425740A (en) * | 2017-09-22 | 2017-12-01 | 武汉盛帆电子股份有限公司 | A kind of high pressure apparent source and high pressure gauge |
| CN110646684A (en) * | 2018-06-27 | 2020-01-03 | 北京北方华创微电子装备有限公司 | Heater fault detection device and method, heating system and semiconductor processing equipment |
-
2009
- 2009-05-06 CN CN2009200393185U patent/CN201449417U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425740A (en) * | 2017-09-22 | 2017-12-01 | 武汉盛帆电子股份有限公司 | A kind of high pressure apparent source and high pressure gauge |
| CN110646684A (en) * | 2018-06-27 | 2020-01-03 | 北京北方华创微电子装备有限公司 | Heater fault detection device and method, heating system and semiconductor processing equipment |
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