CN201122172Y - Electric energy meter capable of measuring electric energy measurement error - Google Patents
Electric energy meter capable of measuring electric energy measurement error Download PDFInfo
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- CN201122172Y CN201122172Y CNU2008200703488U CN200820070348U CN201122172Y CN 201122172 Y CN201122172 Y CN 201122172Y CN U2008200703488 U CNU2008200703488 U CN U2008200703488U CN 200820070348 U CN200820070348 U CN 200820070348U CN 201122172 Y CN201122172 Y CN 201122172Y
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Abstract
The utility model discloses an electric energy meter which can measure the measurement error of the electric energy. The electric energy meter comprises a shell, IP1, IN1, IP2, IN2, IP3, IN3, IN3 and IP4, IN4 in the shell are input ends of four current; VP1, VN1, VP2, VN2 and VP3, VN3 are the input ends of three voltage. The electric energy meter also comprises a current ADC unit and a voltage ADC unit, power factor phase measurement circuit unit, a power and electric energy measurement circuit unit, a frequency measurement circuit unit, a virtual value measurement circuit unit, a CPU, a watch rate recorder pulse generator, an electric energy and frequency transducer, a display, a communication interface, a CF1 and CF2, a LF1 and a LF2, and a LF3 and a LF4. The electric energy meter reduces the electric energy measurement error because of the self errors of a current transformator, a voltage transformator and the electric energy meter under the conditions that the accuracy levels of the current transformator and the voltage transformator as well as the electric energy meter are not improved, at the same time, improves the confidence coefficient of the electric energy measurement value, and lowers the uncertainty of the measurement result.
Description
Technical field
The utility model relates to a kind of Electric Measurement Technology field, particularly a kind of can metering current mulual inductor, the electric energy meter of voltage transformer (VT), electric energy meter error.
At present, electric energy meter mainly is metering electric flux (active energy, reactive energy, apparent electric energy, fundamental energy, harmonic electric energy, a first-harmonic active energy, fundamental wave reactive power electric energy, harmonic wave active energy, harmonic wave reactive energy, time-sharing measurement electric energy etc.), no matter which type of principle electric energy meter adopts, such as, induction electric energy meter, or electronic electric energy meter; No matter what access way electric energy meter is, such as, directly access type, through the mutual inductor access type, or through omnipotent mutual inductor access type; No matter the environment for use of electric energy meter has any difference, such as indoor type, or outdoor type; No matter which type of function electric energy meter has, no matter also be domestic production, or external import, all be to be used for measuring electric energy.
Because many power consumer power consumptions are bigger, for the user of electric current, current transformer must be installed above 100A, for the user of working voltage above 660V, also must the installation voltage transformer (VT).
As all gauging instruments, itself also has error in dipping current transformer, voltage transformer (VT) and electric energy meter, and therefore, the power consumption that actual power consumption and electric energy meter show is different, Here it is electric energy metering error.
Summary of the invention
The objective of the invention is to reduce this electric energy metering error, just reduce the power consumption difference that actual power consumption and electric energy meter show as far as possible.Thereby provide a kind of electric energy meter that can measure electric energy metering error.
The purpose of this utility model can realize by following measure:
The utility model comprises housing, IP in the housing
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4Be the input end of four electric currents, VP
1, VN
1, VP
2, VN
2And VP
3, VN
3It is the input end of three voltages, electric current ADC unit and voltage ADC unit, power factor phase measuring circuit unit, power, electric energy measurement circuit unit, the frequency measurement circuit unit, effective value metering circuit unit, CPU, calibration impulse generator, electric energy, frequency converter, display, communication interface, CF1 and CF2; LF1, LF2; LF3, LF4; Wherein, the vector of electric current
Pass through IP
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4The input end input current ADC of four electric currents; The vector of voltage
Pass through VP
1, VN
1, VP
2, VN
2And VP
3, VN
3The input end of three voltages; Input voltage ADC; Reference voltage is input current ADC unit and voltage ADC unit respectively; Electric current ADC unit and voltage ADC unit output to power factor phase measurement unit, power, electric energy measurement unit, frequency measurement unit and effective value respectively and measure measuring unit; Power factor phase measurement unit, power, electric energy measurement unit, frequency measurement unit and effective value measuring unit are connected to CPU, calibration impulse generator and electric energy, frequency converter respectively; CPU connects display, communication interface, calibration impulse generator and electric energy, frequency converter respectively; The calibration impulse generator is connected to CF1 and CF2 interface respectively; Electric energy, frequency converter connect LF1, LF2, LF3 and LF4 interface respectively.
Electric energy meter of the present utility model is a direct access type or through the mutual inductor insertion type or through general-purpose mutual inductor access type electric energy meter.CPU is in the electric energy meter housing or outside the electric energy meter housing.CPU connects communication by the communication interface of digital input and output.
The utility model is owing to adopt the foregoing circuit structure, the beneficial effect that makes it to have is: under the situation that does not improve current transformer, voltage transformer (VT) and electric energy meter class of accuracy, reduced because the electric energy metering error that current transformer, voltage transformer (VT) and the error of electric energy meter own are brought; Improve the degree of confidence of electric energy metrical value simultaneously, reduced the uncertainty of measurement result.This electric energy meter can effectively improve the electric energy metrical precision under the situation of not changing current transformer and voltage transformer (VT).Rationally take into account power supplier and electric consumer both sides' interests.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the 1st embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for;
Fig. 3 is the 2nd embodiment: the circuit theory diagrams that are used for single-phase electric energy meter;
Fig. 4 is the 3rd embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for;
Fig. 5 is the 4th embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for;
Fig. 6 is the 5th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter;
Fig. 7 is the 6th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter;
Fig. 8 is the 7th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter;
Fig. 9 is the 8th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter;
Figure 10 is the 9th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter;
Figure 11 is the 10th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter;
Figure 12 is the 11st embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter;
Figure 13 is the 12nd embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter;
Figure 14 is the 13rd embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter;
Figure 15 is the 14th embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter.
Embodiment
The utility model is done with detailed description below in conjunction with drawings and Examples:
As shown in the figure, the utility model comprises housing, IP in the housing
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4Be the input end of four electric currents, VP
1, VN
1, VP
2, VN
2And VP
3, VN
3It is the input end of three voltages, electric current ADC unit and voltage ADC unit, power factor phase measuring circuit unit, power, electric energy measurement circuit unit, the frequency measurement circuit unit, effective value metering circuit unit, CPU, calibration impulse generator, electric energy, frequency converter, display, communication interface, CF1 and CF2; LF1, LF2; LF3, LF4;
The vector of electric current
Pass through IP
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4The input end input current ADC of four electric currents; The vector of voltage
Pass through VP
1, VN
1, VP
2, VN
2And VP
3, VN
3The input end of three voltages; Input voltage ADC; Reference voltage is input current ADC unit and voltage ADC unit respectively; Electric current ADC unit and voltage ADC unit output to power factor phase measurement unit, power, electric energy measurement unit, frequency measurement unit and effective value respectively and measure measuring unit; Power factor phase measurement unit, power, electric energy measurement unit, frequency measurement unit and effective value measuring unit are connected to CPU, calibration impulse generator and electric energy, frequency converter respectively; CPU connects display, communication interface, calibration impulse generator and electric energy, frequency converter respectively; The calibration impulse generator is connected to CF1 and CF2 interface respectively; Electric energy, frequency converter connect LF1, LF2, LF3 and LF4 interface respectively.
Electric energy meter is a direct access type or through the mutual inductor insertion type or through general-purpose mutual inductor access type electric energy meter.CPU is in the electric energy meter housing or outside the electric energy meter housing.CPU connects communication by the communication interface of digital input and output.
Electric energy meter of the present utility model can be direct access type, through the mutual inductor insertion type or through general-purpose mutual inductor access type.Electric energy meter of the present utility model can be measured active energy, reactive energy, apparent electric energy, fundamental energy, harmonic electric energy, first-harmonic active energy, fundamental wave reactive power electric energy, harmonic wave active energy, harmonic wave reactive energy, time-sharing measurement electric energy.
Specifically: the utility model is with in certified current transformer, voltage transformer (VT) and the electric energy meter error input electric energy meter, the data that electric energy meter is gathered promptly can obtain the electric energy metering error that brings owing to current transformer, voltage transformer (VT) and the error of electric energy meter own according in addition computing of formula (1), (2), (3) and (4).
The calculating of single-phase electric energy Watch Error:
γ
1=γ
W+ ε
c+ ε
p+ 0.0291 (δ
c-δ
p) tg ф (%) (1) three-phase and four-line
The calculating of electric energy meter error:
γ
2＝γ
W+1/3×〔(ε
p1+ε
p2+ε
p3)+(ε
c1+ε
c2+ε
c3)〕+0.0097〔(δ
c1+δ
c2+δ
c3)-(δ
p1+δ
p2+δ
p3)〕tgф(％) (2)
When two voltage transformer (VT) are the V-arrangement connection, the calculating of three-phase three-wire electric energy meter error:
γ
3＝γ
W+1/2×〔(ε
p12+ε
p32)+(ε
c1+ε
c3)〕+0.0084〔(δ
c1+δ
c3)-(δ
p12+δ
p32)〕+0.014549×〔(δ
c1+δ
c3)-(δ
p12+δ
p32)〕tgф+0.28868×〔(ε
p32-ε
p12)+(ε
c3-ε
c1)〕tgф(％) (3)
Three-phase three is write the calculating of electric energy meter error when three voltage transformer (VT) connect for Y shape:
γ
4＝γ
W+1/6〔2(ε
p1+ε
p2+ε
p3〕+3(ε
c1+δ
c3)〕+0.0084(δ
c1-δ
c3)-0.2887(ε
c1-ε
c3)tgф+0.00485〔3(δ
c1+δ
c3)-2(δ
p1+δ
p2+δ
p3)〕tgф(％)
(4)
Formula (1) is to formula (4):
γ
W--the error of-electric energy meter;
γ
1, γ
2, γ
3, γ
4--the casing error of----all kinds of electric power meters;
ε
c--the ratio of-current transformer;
ε
p--the ratio of-voltage transformer (VT);
δ
c--the angular difference of-current transformer;
δ
p--the angular difference of-voltage transformer (VT);
The phasing degree of ф---current return and voltage circuit;
ε
P1--the ratio of-A phase voltage mutual inductor;
ε
P2--the ratio of-B phase voltage mutual inductor;
ε
P3--the ratio of-C phase voltage mutual inductor;
ε
C1--the ratio of-A phase current mutual inductor;
ε
C2--the ratio of-B phase current mutual inductor;
ε
C3--the ratio of-C phase current mutual inductor;
δ
C1--the angular difference of-A phase current mutual inductor;
δ
C2--the angular difference of-B phase current mutual inductor;
δ
C3--the angular difference of-C phase current mutual inductor;
δ
P1--the angular difference of-A phase voltage mutual inductor;
δ
P2--the angular difference of-B phase voltage mutual inductor;
δ
P3--the angular difference of-C phase voltage mutual inductor;
ε
P12The ratio of the voltage transformer (VT) between---be connected to A phase and the B phase;
ε
P32The ratio of the voltage transformer (VT) between---be connected to C phase and the B phase;
δ
P12The angular difference of the voltage transformer (VT) between---be connected to A phase and the B phase;
δ
P32The angular difference of the voltage transformer (VT) between---be connected to C phase and the B phase.
Expect because the electric energy metering error that the error of current transformer own is brought, as long as the error term of voltage transformer (VT) and electric energy meter in formula (1), (2), (3) and (4) is removed, promptly can be calculated the electric energy metering error that the error of current transformer own is brought; Equally, expect because the electric energy metering error that the error of voltage transformer (VT) own is brought, as long as the error term of current transformer and electric energy meter in formula (1), (2), (3) and (4) is removed, promptly can be calculated the electric energy metering error that the error of voltage transformer (VT) own is brought; Expect because the electric energy metering error that the error of electric energy meter own is brought as long as the error term of voltage transformer (VT) and Electricity Federation mutual inductor in formula (1), (2), (3) and (4) is removed, promptly can calculate the electric energy metering error that the error of electric energy meter own is brought.Expect electric energy metrical value more accurately, as long as with the modified value of corresponding error and electric energy meter (originally electric energy meter) measurement the energy value addition, the energy value more accurately of the error acquisition of current transformer, voltage transformer (VT) and electric energy meter that just can be eliminated own.
The utility model principle of work is as follows:
Fig. 1 is circuit theory diagrams of the present invention; Fig. 2 is the 1st embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for, this embodiment are that single-phase electric energy meter is to insert through current transformer and voltage transformer (VT); Fig. 3 is the 2nd embodiment: be used for the circuit theory diagrams of single-phase electric energy meter, this embodiment is that single-phase electric energy meter inserts without voltage transformer (VT) through current transformer; Fig. 4 is the 3rd embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for, this embodiment are that single-phase electric energy meter inserts without current transformer through voltage transformer (VT); Fig. 5 is the 4th embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for.This embodiment is that single-phase electric energy meter is to insert without the voltage transformer (VT) summation current transformer; Fig. 6 is the 5th embodiment: be used for the circuit theory diagrams of three-phase three-wire electric energy meter, this embodiment is that three-phase three-wire electric energy meter is to insert with voltage transformer (VT) (two voltage transformer (VT) are that V-type is connected) through current transformer; Fig. 7 is the 6th embodiment: be used for the circuit theory diagrams of three-phase three-wire electric energy meter, this embodiment is that three-phase three-wire electric energy meter inserts without voltage transformer (VT) through current transformer; Fig. 8 is the 7th embodiment: be used for the circuit theory diagrams of three-phase three-wire electric energy meter, this embodiment is that three-phase three-wire electric energy meter is to insert without current transformer through voltage transformer (VT); Fig. 9 is the 8th embodiment: be used for the circuit theory diagrams of three-phase three-wire electric energy meter, this embodiment is that three-phase three-wire electric energy meter is to insert without the voltage transformer (VT) summation current transformer; Figure 10 is the 9th embodiment: be used for the circuit theory diagrams of three-phase three-wire electric energy meter, this embodiment is that three-phase three-wire electric energy meter inserts with voltage transformer (VT) (three voltage transformer (VT) are connected for the Y type) through current transformer; Figure 11 is the 10th embodiment: be used for the circuit theory diagrams of three-phase three-wire electric energy meter, this embodiment is that three-phase three-wire electric energy meter inserts through voltage transformer (VT) (three voltage transformer (VT) connect for the Y type); Figure 12 is the 11st embodiment: be used for the circuit theory diagrams of three-phase and four-line electric energy meter, this embodiment is that the three-phase and four-line electric energy meter inserts through current transformer and voltage transformer (VT); Figure 13 is the 12nd embodiment: be used for the circuit theory diagrams of three-phase and four-line electric energy meter, this embodiment is that the three-phase and four-line electric energy meter inserts through current transformer; Figure 14 is the 13rd embodiment: be used for the circuit theory diagrams of three-phase and four-line electric energy meter, this embodiment is that the three-phase and four-line electric energy meter is directly to insert; Figure 15 is the 14th embodiment: be used for the circuit theory diagrams of three-phase and four-line electric energy meter, this embodiment is that the three-phase and four-line electric energy meter inserts through voltage transformer (VT).
Fig. 1 is circuit theory diagrams of the present invention.
Among Fig. 1: comprise IP
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4It is the input end of four electric currents; VP
1, VN
1, VP
2, VN
2And VP
3, VN
3It is the input end of three voltages;
Be electric current vector,
It is the vector of voltage; Reference voltage; Electric current ADC voltage ADC; The power factor phase measuring circuit; Power, electric energy measurement circuit; Frequency measurement circuit; The effective value metering circuit; CPU; The calibration impulse generator; Electric energy, frequency converter; Display; Communication interface; CF1 and CF2; LF1, LF2; LF3, LF4.
Mutual relationship and connection are as follows:
1 describe realization principle of the present invention and embodiment in detail in conjunction with the accompanying drawings:
IP
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4Be the input end of four electric currents,
Be the vector of electric current,
Be the secondary current of current transformer input, electrical energy meter electricity flows back to the electric current of this input of route; Can make Current Transformer (or clamp current transformer) input, also can use the shunt input.This all is the ultimate principle that the principles of electric and electronic engineering were described, as long as the mutual inductor or the resistance that use can guarantee that precision is just passable.
VP
1, VN
1, VP
2, VN
2And VP
3, VN
3Be the input end of voltage, it and IP, IN input end are same input ends,
It is the vector of voltage;
Be the secondary voltage of voltage transformer (VT) input, the voltage that the electrical energy meter electricity hydraulic circuit is imported thus; Can import by working voltage mutual inductor (or current mode voltage transformer (VT)), also can use the voltage divider input.As required, such interface can have a plurality of, for example, and single-phase electric energy meter, each one of IP, IN and VP, VN; According to anti-electricity-theft needs, also can be one of two VP of IP, IN, VN; Three-phase three-wire electric energy meter, each two of IP, IN and VP, VN; According to anti-electricity-theft needs, also can be two of three VP of IP, IN, VN; When voltage transformer (VT) Y type connects, also can be three of two VP of IP, IN, VN; The three-phase and four-line electric energy meter, each three of IP, IN and VP, VN; According to anti-electricity-theft needs, also can be three of four VP of IP, IN, VN; Because 26S Proteasome Structure and Function all is the same, so repeated description no longer.
ADC is an analog/digital converter, and electric current ADC is converted to digital quantity with the magnitude of current exactly, and voltage ADC is converted to digital quantity with voltage exactly.In fact, they are the same, because the essence of ADC analog/digital converter is a voltage/digital quantizer, electric current ADC just is to use sampling resistor, allow electric current pass through sampling resistor, measure the pressure drop of sampling resistor, utilize Ohm law that current conversion is voltage exactly, electric current ADC is exactly in fact a voltage ADC, just the sampling method difference of input end.Different amounts is converted to digital quantity, as long as we changed measured according to Ohm law, utilizes ADC that analog quantity is converted to digital quantity.Needs according to measuring can use multi-channel A/D analog/digital converter, also can use multi-disc A/D analog/digital converter, according to different measurement ranges, can use A/D built-in or add amplifier, also can use the external amplifier of A/D.Reference voltage is external reference voltage, if the built-in reference voltage precision of A/D analog/digital converter can satisfy the demand, can no longer external reference voltage.
Electric current, voltage effective value measuring unit are mainly digital signal processing circuit, according to the needs of measuring accuracy and environment for use, can obtain effective value, also can obtain vector
With
Power, electric energy measurement unit are mainly digital multiplication or analog multiplier, and signal processing circuit.Power factor phase measurement unit carries out power factor and Phase Processing to signal.The main survey frequency of frequency measurement unit.Work as current vector
With voltage vector
When multiplying each other, the result is exactly a power.The electric energy measurement unit to time integral, or multiply by the time with power with power, and this can be finished by the electric energy measurement unit in the chip, also can be finished by single-chip microcomputer, or be finished by the Pc machine.Electric energy with the measurement of electric energy measurement unit, information according to the electric energy meter collection, the data that electric energy meter is gathered promptly can obtain the electric energy metering error that brings owing to current transformer, voltage transformer (VT) and the error of electric energy meter own according in addition computing of formula (1), (2), (3) and (4).The modified value of corresponding error and electric energy meter (originally electric energy meter) are measured the energy value addition of institute, the energy value more accurately of the error acquisition of current transformer, voltage transformer (VT) and electric energy meter that just can be eliminated own.
Electric energy-pulse converter is exactly that value with electric energy converts frequency and the proportional pulse of electric energy to, the pulse (the common active energy that does not add correction) that LF1, LF2 output is directly proportional with active energy; The pulse (the common reactive energy that does not add correction) that LF3, LF4 output is directly proportional with reactive energy; , LF1, LF2 also can export the pulse (through the active energy of revising more accurately) that is directly proportional with active energy; The pulse that LF3, LF4 output is directly proportional with reactive energy (through the reactive energy of revising more accurately); Perhaps, LF1, LF2 export the pulse (the common active energy that does not add correction) that is directly proportional with active energy; The pulse that LF3, LF4 output is directly proportional with active energy (through the active energy of revising more accurately); Perhaps, LF1, LF2 export the pulse (the common electric energy that has or not that does not add correction) that is directly proportional with reactive energy; LF3, LF4 output and the pulse that is directly proportional (through the reactive energy of revising more accurately); These can be by software set.The pulse that LF1, LF2 output is directly proportional with active energy; The pulse that LF3, LF4 output is directly proportional with reactive energy; The calibration impulse generator generates calibration pulse CF1 and CF2, specially as the usefulness of calibration.By communication port signal is delivered to CPU, CPU can use single-chip microcomputer, also can use industrial computer; CPU with data processing after, deliver to LED nixie display or LCD liquid crystal display displays, send printer prints.Also can connect machine, or be connected, or send printer prints with data transmission system by communication port and host computer.
These functions can be integrated in one or several chip, perhaps use chip and elements combination with corresponding function to form, and this does not influence enforcement of the present invention.Above-mentioned functions and method are essentially identical in the present invention, no longer repeat among the embodiment afterwards.
Fig. 2 is the 1st embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for.This embodiment is that single-phase electric energy meter is to insert through current transformer and voltage transformer (VT).
Among Fig. 2: A is the phase line (being live wire) of circuit, and N is the zero line of circuit, the elementary L of current transformer CT
1, L
2Be connected with the phase line of circuit, CT level of current transformer is connected with 3 with the terminals 1 of current transformer CT single-phase electric energy meter; The elementary A of voltage transformer pt is connected with phase line, and X is connected with zero line; The terminals 2 of the secondary a single-phase electric energy meter of voltage transformer pt connect, and x is connected with 5 with the terminals 4 of single-phase electric energy meter.Like this, current transformer CT by the terminals 1 and 3 of single-phase electric energy meter, provides the signal of electric current to single-phase electric energy meter, and signal is added to current input terminal IP, IN.Voltage transformer pt by the terminals 2 and 5 of single-phase electric energy meter, provides the signal of voltage to single-phase electric energy meter, and signal is added to voltage input end VP, VN.
Current input terminal IP, IN add to analog/digital converter electric current ADC with current signal, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP, VN add to analog/digital converter voltage ADC with voltage signal, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 3 is the 2nd embodiment: the circuit theory diagrams that are used for single-phase electric energy meter.This embodiment is that single-phase electric energy meter inserts without voltage transformer (VT) through current transformer.
Among Fig. 3: A is the phase line (being live wire) of circuit, and N is the zero line of circuit, the elementary L of current transformer CT
1, L
2Be connected with the phase line of circuit, CT level of current transformer is connected with 3 with the terminals 1 of current transformer CT single-phase electric energy meter; Working voltage mutual inductor PT not, the phase line A of circuit directly is connected with the terminals 2 of single-phase electric energy meter, and the zero line X of circuit is connected with 5 with the terminals 4 of single-phase electric energy meter.Like this, current transformer CT by the terminals 1 and 3 of single-phase electric energy meter, provides the signal of electric current to single-phase electric energy meter, and signal is added to current input terminal IP, IN.The terminals 2 and 5 of voltage by single-phase electric energy meter provide the signal of voltage to single-phase electric energy meter, and signal is added to voltage input end VP, VN.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 4 is the 3rd embodiment: the circuit theory diagrams of the single-phase electric energy meter that is used for.This embodiment is that single-phase electric energy meter inserts without current transformer through voltage transformer (VT).
Among Fig. 4: A is the phase line (being live wire) of circuit, and N is the zero line of circuit, and the phase line A of circuit connects with the current return terminals 1 and 3 of single-phase electric energy meter; The elementary A of voltage transformer pt is connected with phase line, and X is connected with zero line; The terminals 2 of the secondary a single-phase electric energy meter of voltage transformer pt connect, and x is connected with 5 with the terminals 4 of single-phase electric energy meter.Like this, current transformer CT by the terminals 1 and 3 of single-phase electric energy meter, provides the signal of electric current to single-phase electric energy meter, and signal is added to current input terminal IP, IN.Voltage transformer pt by the terminals 2 and 5 of single-phase electric energy meter, provides the signal of voltage to single-phase electric energy meter, and signal is added to voltage input end VP, VN.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 5 is the 4th embodiment:
The circuit theory diagrams of the single-phase electric energy meter that is used for.This embodiment is that single-phase electric energy meter is to insert without the voltage transformer (VT) summation current transformer.
Among Fig. 5: A is the phase line (being live wire) of circuit, and N is the zero line of circuit, and the phase line A of circuit connects with the current return terminals 1 and 3 of single-phase electric energy meter; The phase line A of circuit (being live wire) is connected with the terminals 2 of single-phase electric energy meter, and the zero line N of circuit is connected with 5 with the terminals 4 of single-phase electric energy meter.Like this, the terminals 1 and 3 of circuit by single-phase electric energy meter provide the signal of electric current to single-phase electric energy meter, and signal is added to current input terminal IP, IN.The terminals 2 and 5 of circuit by single-phase electric energy meter provide the signal of voltage to single-phase electric energy meter, and signal is added to voltage input end VP, VN.
Current input terminal IP, IN add to analog/digital converter electric current ADC with current signal, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP, VN add to analog/digital converter voltage ADC with voltage signal, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 6 is the 5th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter.This embodiment is that three-phase three-wire electric energy meter is to insert with voltage transformer (VT) (two voltage transformer (VT) are that V-type is connected) through current transformer.
Among Fig. 6: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the elementary L of current transformer CT
1, L
2Connect with circuit A phase line mutually, CT level of current transformer is connected with 3 with the terminals 1 of three-phase three-wire electric energy meter; Current transformer CT
CElementary L
1, L
2Connect with circuit C phase line mutually, CT level of current transformer is connected with 8 with the terminals 6 of three-phase three-wire electric energy meter; Voltage transformer pt
1Elementary A
1Be connected with the A phase line, X (is A
2) connect with B phase line mutually; Voltage transformer pt
1Secondary a
1Be connected with the terminals 2 of three-phase three-wire electric energy meter, x (is a
2) be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter; Voltage transformer pt
3Elementary A
3Be connected with the C phase line, X (is A
2) connect with B phase line mutually; Voltage transformer pt
3Secondary a
3Be connected with the terminals 7 of three-phase three-wire electric energy meter, x (is a
2) be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter.Like this, current transformer CT by the terminals 1 and 3 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the A of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
1, IN
1Current transformer CT
C, by the terminals 6 and 8 of three-phase three-wire electric energy meter, providing the signal of electric current mutually to the C of three-phase three-wire electric energy meter, signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
12, VN
12 Voltage transformer pt
3, by the terminals 7 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
32, VN
32
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
12, VN
12And VP
32, VN
32Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 7 is the 6th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter.This embodiment is that three-phase three-wire electric energy meter inserts without voltage transformer (VT) through current transformer.
Among Fig. 7: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the elementary L of current transformer CT
1, L
2Connect with circuit A phase line mutually, CT level of current transformer is connected with 3 with the terminals 1 of three-phase three-wire electric energy meter; Current transformer CT
CElementary L
1, L
2Connect with circuit C phase line mutually, CT level of current transformer is connected with 8 with the terminals 6 of three-phase three-wire electric energy meter; The phase line of circuit A phase directly is connected with the terminals 2 of three-phase three-wire electric energy meter, and the phase line of circuit B phase directly is connected with 5 with the terminals 4 of three-phase three-wire electric energy meter; The phase line of circuit C phase directly is connected with the terminals 7 of three-phase three-wire electric energy meter.Like this, current transformer CT by the terminals 1 and 3 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the A of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
1, IN
1Current transformer CT
C, by the terminals 6 and 8 of three-phase three-wire electric energy meter, providing the signal of electric current mutually to the C of three-phase three-wire electric energy meter, signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
12, VN
12 Voltage transformer pt
3, by the terminals 7 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
32, VN
32The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 8 is the 7th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter.This embodiment is that three-phase three-wire electric energy meter is to insert without current transformer through voltage transformer (VT).
Among Fig. 8: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the phase line of current circuit A phase and the terminals 1 of three-phase three-wire electric energy meter and 3 polyphones; The phase line of circuit C phase and the terminals 6 of three-phase three-wire electric energy meter and 8 polyphones; Voltage transformer pt
1Elementary A
1Be connected with the A phase line, X (is A
2) connect with B phase line mutually; Voltage transformer pt
1Secondary a
1Be connected with the terminals 2 of three-phase three-wire electric energy meter, x (is a
2) be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter; Voltage transformer pt
3Elementary A
3Be connected with the C phase line, X (is A
2) connect with B phase line mutually; Voltage transformer pt
3Secondary a
3Be connected with the terminals 7 of three-phase three-wire electric energy meter, x (is a
2) be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter.Like this, the phase line of circuit A phase by the terminals 1 and 3 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the A of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
1, IN
1The phase line of circuit C phase by the terminals 6 and 8 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the C of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
12, VN
12 Voltage transformer pt
3, by the terminals 7 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
32, VN
32
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
12, VN
12And VP
32, VN
32Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Fig. 9 is the 8th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter.This embodiment is that three-phase three-wire electric energy meter is to insert without the voltage transformer (VT) summation current transformer.
Among Fig. 9: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the phase line of current circuit A phase and the terminals 1 of three-phase three-wire electric energy meter and 3 polyphones; The phase line of circuit C phase and the terminals 6 of three-phase three-wire electric energy meter and 8 polyphones; The phase line of circuit A phase is connected with the terminals 2 of three-phase three-wire electric energy meter, and x (is a
2) be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter; Voltage transformer pt
3Elementary A
3Be connected with the C phase line, X (is A
2) connect with B phase line mutually; The phase line of circuit C phase is connected with the terminals 7 of three-phase three-wire electric energy meter, and the terminals 4 of the phase line three-phase three-wire electric energy meter of circuit B phase are connected with 5.Like this, the phase line of circuit A phase by the terminals 1 and 3 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the A of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
1, IN
1The phase line of circuit C phase by the terminals 6 and 8 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the C of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
12, VN
12 Voltage transformer pt
3, by the terminals 7 and 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
32, VN
32
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
12, VN
12And VP
32, VN
32Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Figure 10 is the 9th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter.This embodiment is that three-phase three-wire electric energy meter inserts with voltage transformer (VT) (three voltage transformer (VT) are connected for the Y type) through current transformer.
Among Figure 10: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the elementary L of current transformer CT
1, L
2Connect with circuit A phase line mutually, CT level of current transformer is connected with 3 with the terminals 1 of three-phase three-wire electric energy meter; Current transformer CT
CElementary L
1, L
2Connect current transformer CT with circuit C phase line mutually
CSecondaryly be connected with 8 with the terminals 6 of three-phase three-wire electric energy meter; Voltage transformer pt
1Elementary A
1Be connected with the A phase line; Voltage transformer pt
2Elementary A
2Connect with B phase line mutually; Voltage transformer pt
3Elementary A
3Be connected with the C phase line; The X end of three voltage transformer (VT) connects, and constitutes the artificial neutral point.Voltage transformer pt
1Secondary a
1Be connected voltage transformer pt with the terminals 2 of three-phase three-wire electric energy meter
2Secondary a
2Be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter; Voltage transformer pt
3Secondary a
3Be connected with the terminals 7 of three-phase three-wire electric energy meter, the X end of three voltage transformer (VT) connects, and constitutes the artificial neutral point.Like this, current transformer CT by the terminals 1 and 3 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the A of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
1, IN
1Current transformer CT
C, by the terminals 6 and 8 of three-phase three-wire electric energy meter, providing the signal of electric current mutually to the C of three-phase three-wire electric energy meter, signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter A, signal is added to voltage input end VP
1, VN
1Voltage transformer pt
2, by the terminals 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter B, signal is added to voltage input end VP
2, VN
2Voltage transformer pt
3, by the terminals 7 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
3, VN
3
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
1, VN
1, VP
2, VN
2And VP
3, VN
3Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Figure 11 is the 10th embodiment: the circuit theory diagrams that are used for three-phase three-wire electric energy meter.This embodiment is that three-phase three-wire electric energy meter inserts through voltage transformer (VT) (three voltage transformer (VT) connect for the Y type).
Among Figure 11: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, and the phase line of circuit A phase connects, the phase line of circuit A phase and the terminals 1 of three-phase three-wire electric energy meter and 3 polyphones; The phase line of circuit C phase and the terminals 6 of three-phase three-wire electric energy meter and 8 polyphones; Voltage transformer pt
1Elementary A
1Be connected with the A phase line; Voltage transformer pt
2Elementary A
2Connect with B phase line mutually; Voltage transformer pt
3Elementary A
3Be connected with the C phase line; The X end of three voltage transformer (VT) connects, and constitutes the artificial neutral point.Voltage transformer pt
1Secondary a
1Be connected voltage transformer pt with the terminals 2 of three-phase three-wire electric energy meter
2Secondary a
2Be connected with 5 with the terminals 4 of three-phase three-wire electric energy meter; Voltage transformer pt
3Secondary a
3Be connected with the terminals 7 of three-phase three-wire electric energy meter, the X end of three voltage transformer (VT) connects, and constitutes the artificial neutral point.Like this, current transformer CT by the terminals 1 and 3 of three-phase three-wire electric energy meter, provides the signal of electric current mutually to the A of three-phase three-wire electric energy meter, and signal is added to current input terminal IP
1, IN
1Current transformer CT
C, by the terminals 6 and 8 of three-phase three-wire electric energy meter, providing the signal of electric current mutually to the C of three-phase three-wire electric energy meter, signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter A, signal is added to voltage input end VP
1, VN
1Voltage transformer pt
2, by the terminals 5 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter B, signal is added to voltage input end VP
2, VN
2Voltage transformer pt
3, by the terminals 7 of three-phase three-wire electric energy meter, providing the signal of voltage mutually to three-phase three-wire electric energy meter AC, signal is added to voltage input end VP
3, VN
3
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
1, VN
1,, VP
2, VN
2And VP
3, VN
3Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
。
Figure 12 is the 11st embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter.This embodiment is that the three-phase and four-line electric energy meter inserts through current transformer and voltage transformer (VT).
Among Figure 12: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the elementary L of current transformer CT
1, L
2Connect with circuit A phase line mutually, CT level of current transformer is connected with 3 with the terminals 1 of three-phase and four-line electric energy meter; Current transformer CT
BElementary L
1, L
2Connect current transformer CT with circuit B phase line mutually
BSecondaryly be connected with 6 with the terminals 4 of three-phase and four-line electric energy meter; Current transformer CT
CElementary L
1, L
2Connect current transformer CT with circuit C phase line mutually
CSecondaryly be connected with 9 with the terminals 7 of three-phase and four-line electric energy meter; Voltage transformer pt
1Elementary A
1Be connected with the A phase line; Voltage transformer pt
2Elementary A
2Connect with B phase line mutually; Voltage transformer pt
3Elementary A
3Be connected with the C phase line; The X end of three voltage transformer (VT) connects, and N links to each other with zero-power line.Voltage transformer pt
1Secondary a
1Be connected voltage transformer pt with the terminals 2 of three-phase and four-line electric energy meter
2Secondary a
2Be connected with the terminals 5 of three-phase and four-line electric energy meter; Voltage transformer pt
3Secondary a
3Be connected with the terminals 8 of three-phase and four-line electric energy meter, the X end of three voltage transformer (VT) connects, and N links to each other with zero-power line.Like this, current transformer CT by the terminals 1 and 3 of three-phase and four-line electric energy meter, provides the signal of electric current mutually to the A of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
1, IN
1Current transformer CT
B, by the terminals 4 and 6 of three-phase and four-line electric energy meter, providing the signal of electric current mutually to the B of three-phase and four-line electric energy meter, signal is added to current input terminal IP
2, IN
2Current transformer CT
C, by the terminals 7 and 9 of three-phase and four-line electric energy meter, providing the signal of electric current mutually to the C of three-phase and four-line electric energy meter, signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 of three-phase and four-line electric energy meter, providing the signal of voltage mutually to three-phase and four-line electric energy meter A, signal is added to voltage input end VP
1, VN
1Voltage transformer pt
2, by the terminals 5 of three-phase and four-line electric energy meter, providing the signal of voltage mutually to three-phase and four-line electric energy meter B, signal is added to voltage input end VP
2, VN
2Voltage transformer pt
3, by the terminals 7 of three-phase and four-line electric energy meter, providing the signal of voltage mutually to three-phase and four-line electric energy meter AC, signal is added to voltage input end VP
3, VN
3
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
1, VN
1,, VP
2, VN
2And VP
3, VN
3Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Figure 13 is the 12nd embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter.This embodiment is that the three-phase and four-line electric energy meter inserts through current transformer.
Among Figure 12: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, the elementary L of current transformer CT
1, L
2Connect with circuit A phase line mutually, CT level of current transformer is connected with 3 with the terminals 1 of three-phase and four-line electric energy meter; Current transformer CT
BElementary L
1, L
2Connect current transformer CT with circuit B phase line mutually
BSecondaryly be connected with 6 with the terminals 4 of three-phase and four-line electric energy meter; Current transformer CT
CElementary L
1, L
2Connect current transformer CT with circuit C phase line mutually
CSecondaryly be connected with 9 with the terminals 7 of three-phase and four-line electric energy meter; The phase line of circuit C phase is connected with the C phase line; The phase line of circuit A phase is connected with the terminals 2 of three-phase and four-line electric energy meter; The phase line of circuit B phase is connected with the terminals 5 of three-phase and four-line electric energy meter; The phase line of circuit C phase is connected with the terminals 8 of three-phase and four-line electric energy meter, and zero-power line N is connected with the terminals 11 of three-phase and four-line electric energy meter.Like this, current transformer CT by the terminals 1 and 3 of three-phase and four-line electric energy meter, provides the signal of electric current mutually to the A of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
1, IN
1Current transformer CT
B, by the terminals 4 and 6 of three-phase and four-line electric energy meter, providing the signal of electric current mutually to the B of three-phase and four-line electric energy meter, signal is added to current input terminal IP
2, IN
2Current transformer CT
C, by the terminals 7 and 9 of three-phase and four-line electric energy meter, providing the signal of electric current mutually to the C of three-phase and four-line electric energy meter, signal is added to current input terminal IP
3, IN
3The terminals 2 of A voltage by the three-phase and four-line electric energy meter provide the signal of voltage mutually to three-phase and four-line electric energy meter A, and signal is added to voltage input end VP
1, VN
1The terminals 5 of B phase voltage by the three-phase and four-line electric energy meter provide the signal of voltage mutually to three-phase and four-line electric energy meter B, and signal is added to voltage input end VP
2, VN
2C is the terminals 7 by the three-phase and four-line electric energy meter mutually, provide the signal of voltage mutually to three-phase and four-line electric energy meter AC, and signal is added to voltage input end VP
3, VN
3
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
1, VN
1,, VP
2, VN
2And VP
3, VN
3Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Figure 14 is the 13rd embodiment: the circuit theory diagrams that are used for the three-phase and four-line electric energy meter.This embodiment is that the three-phase and four-line electric energy meter is directly to insert.
Among Figure 14: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, and the phase line of circuit A phase is connected with 3 with the terminals 1 of three-phase and four-line electric energy meter; The phase line of circuit B phase is connected with 6 with the terminals 4 of three-phase and four-line electric energy meter; The phase line of circuit C phase is connected with 9 with the terminals 7 of three-phase and four-line electric energy meter; The phase line of circuit A phase is connected with the terminals 2 of three-phase and four-line electric energy meter; The phase line of circuit B phase is connected with the terminals 5 of three-phase and four-line electric energy meter; The phase line of circuit C phase is connected with the terminals 8 of three-phase and four-line electric energy meter, and zero-power line N is connected with the terminals 11 of three-phase and four-line electric energy meter.Like this, the terminals 1 and 3 of A phase current by the three-phase and four-line electric energy meter provide the signal of electric current mutually to the A of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
1, IN
1The terminals 4 and 6 of B phase current by the three-phase and four-line electric energy meter provide the signal of electric current mutually to the B of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
2, IN
2The terminals 7 and 9 of C phase current by the three-phase and four-line electric energy meter provide the signal of electric current mutually to the C of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
3, IN
3The terminals 2 of A voltage by the three-phase and four-line electric energy meter provide the signal of voltage mutually to three-phase and four-line electric energy meter A, and signal is added to voltage input end VP
1, VN
1The terminals 5 of B phase voltage by the three-phase and four-line electric energy meter provide the signal of voltage mutually to three-phase and four-line electric energy meter B, and signal is added to voltage input end VP
2, VN
2C is the terminals 7 by the three-phase and four-line electric energy meter mutually, provide the signal of voltage mutually to three-phase and four-line electric energy meter AC, and signal is added to voltage input end VP
3, VN
3
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
1, VN
1,, VP
2, VN
2And VP
3, VN
3Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Figure 15: A is the phase line of circuit A phase, and B is the phase line of circuit B phase, and C is the phase line of circuit C phase, and the phase line of circuit A phase is connected with 3 with the terminals 1 of three-phase and four-line electric energy meter; The phase line of circuit B phase is connected with 6 with the terminals 4 of three-phase and four-line electric energy meter; The phase line of circuit C phase is connected with 9 with the terminals 7 of three-phase and four-line electric energy meter; Voltage transformer pt
1Elementary A
1Be connected with the A phase line; Voltage transformer pt
2Elementary A
2Connect with B phase line mutually; Voltage transformer pt
3Elementary A
3Be connected with the C phase line; The X end of three voltage transformer (VT) connects, and N links to each other with zero-power line.Voltage transformer pt
1Secondary a
1Be connected voltage transformer pt with the terminals 2 of three-phase and four-line electric energy meter
2Secondary a
2Be connected with the terminals 5 of three-phase and four-line electric energy meter; Voltage transformer pt
3Secondary a
3Be connected with the terminals 8 of three-phase and four-line electric energy meter, the X end of three voltage transformer (VT) connects, and N links to each other with zero-power line.Like this, the terminals 1 and 3 of A phase current by the three-phase and four-line electric energy meter provide the signal of electric current mutually to the A of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
1, IN
1The terminals 4 and 6 of B phase current by the three-phase and four-line electric energy meter provide the signal of electric current mutually to the B of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
2, IN
2The terminals 7 and 9 of C phase current by the three-phase and four-line electric energy meter provide the signal of electric current mutually to the C of three-phase and four-line electric energy meter, and signal is added to current input terminal IP
3, IN
3Voltage transformer pt
1, by the terminals 2 of three-phase and four-line electric energy meter, providing the signal of voltage mutually to three-phase and four-line electric energy meter A, signal is added to voltage input end VP
1, VN
1Voltage transformer pt
2, by the terminals 5 of three-phase and four-line electric energy meter, providing the signal of voltage mutually to three-phase and four-line electric energy meter B, signal is added to voltage input end VP
2, VN
2Voltage transformer pt
3, by the terminals 7 of three-phase and four-line electric energy meter, providing the signal of voltage mutually to three-phase and four-line electric energy meter AC, signal is added to voltage input end VP
3, VN
3
Current input terminal IP
1, IN
1And IP
3, IN
3Current signal is added to analog/digital converter electric current ADC, and electric current ADC is converted to digital quantity with the magnitude of current exactly; Voltage input end VP
1, VN
1,, VP
2, VN
2And VP
3, VN
3Voltage signal is added to analog/digital converter voltage ADC, and voltage ADC is converted to digital quantity with voltage exactly.The principle of its realization is the same with process with Fig. 1.Here no longer repeat.
Claims (7)
1, a kind of electric energy meter that can measure electric energy metering error, it comprises housing, it is characterized in that: IP in the housing
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4Be the input end of four electric currents, VP
1, VN
1, VP
2, VN
2And VP
3, VN
3It is the input end of three voltages, electric current ADC unit and voltage ADC unit, power factor phase measuring circuit unit, power, electric energy measurement circuit unit, the frequency measurement circuit unit, effective value metering circuit unit, CPU, calibration impulse generator, electric energy, frequency converter, display, communication interface, CF1 and CF2; LF1, LF2; LF3, LF4; Wherein, the vector of electric current
Pass through IP
1, IN
1, IP
2, IN
2, IP
3, IN
3And IP
4, IN
4The input end input current ADC of four electric currents; The vector of voltage
Pass through VP
1, VN
1, VP
2, VN
2And VP
3, VN
3The input end input voltage ADC of three voltages; Reference voltage is input current ADC unit and voltage ADC unit respectively; Electric current ADC unit and voltage ADC unit output to power factor phase measurement unit, power, electric energy measurement unit, frequency measurement unit and effective value respectively and measure measuring unit; Power factor phase measurement unit, power, electric energy measurement unit, frequency measurement unit and effective value measuring unit are connected to CPU, calibration impulse generator and electric energy, frequency converter respectively; CPU connects display, communication interface, calibration impulse generator and electric energy, frequency converter respectively; The calibration impulse generator is connected to CF1 and CF2 interface respectively; Electric energy, frequency converter connect LF1, LF2, LF3 and LF4 interface respectively.
2, the electric energy meter that can measure electric energy metering error according to claim 1 is characterized in that: described electric energy meter is direct access type electric energy meter.
3, the electric energy meter that can measure electric energy metering error according to claim 1 is characterized in that: described electric energy meter or through mutual inductor insertion type electric energy meter.
4, the electric energy meter that can measure electric energy metering error according to claim 1 is characterized in that: described electric energy meter is through general-purpose mutual inductor access type electric energy meter.
5, according to claim 1 or 2 or the 3 or 4 described electric energy meters that can measure electric energy metering error, it is characterized in that: described CPU is in the electric energy meter housing.
6, according to claim 1 or 2 or the 3 or 4 described electric energy meters that can measure electric energy metering error, it is characterized in that: described CPU is outside the electric energy meter housing.
7, according to claim 1 or 2 or the 3 or 4 described electric energy meters that can measure electric energy metering error, it is characterized in that: described CPU connects communication by the communication interface of digital input and output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200703488U CN201122172Y (en) | 2008-04-30 | 2008-04-30 | Electric energy meter capable of measuring electric energy measurement error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200703488U CN201122172Y (en) | 2008-04-30 | 2008-04-30 | Electric energy meter capable of measuring electric energy measurement error |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122172Y true CN201122172Y (en) | 2008-09-24 |
Family
ID=40009405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200703488U Expired - Fee Related CN201122172Y (en) | 2008-04-30 | 2008-04-30 | Electric energy meter capable of measuring electric energy measurement error |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331570A (en) * | 2011-06-20 | 2012-01-25 | 辽宁省电力有限公司丹东供电公司 | Electric energy meter on-line detection method |
| CN102426346A (en) * | 2011-10-19 | 2012-04-25 | 上海仪器仪表研究所 | Power meter phase detection control system |
| CN102628892A (en) * | 2012-04-12 | 2012-08-08 | 广东电网公司中山供电局 | Method for calculating voltage-loss unusual electrical energy measurement on line and electric energy meter |
| CN102928659A (en) * | 2012-11-06 | 2013-02-13 | 昆山北极光电子科技有限公司 | High-precision power measuring circuit |
| CN103149430A (en) * | 2013-02-06 | 2013-06-12 | 陕西富集电力科技股份有限公司 | Electric energy pulse implementing method of electric energy meter |
| CN109683119A (en) * | 2018-12-19 | 2019-04-26 | 恒大智慧科技有限公司 | Electric energy measuring equipment automatic calibrating method, computer equipment and storage medium |
| CN110308415A (en) * | 2019-07-05 | 2019-10-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | The error compensating method and device of electric energy metered system |
| CN114002643A (en) * | 2021-11-25 | 2022-02-01 | 国网北京市电力公司 | Electric energy meter detection method and device, electronic equipment and computer readable storage medium |
| CN114296023A (en) * | 2021-12-27 | 2022-04-08 | 广西电网有限责任公司 | Low-voltage transformer area metering device operation error diagnosis and analysis method and system |
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2008
- 2008-04-30 CN CNU2008200703488U patent/CN201122172Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331570A (en) * | 2011-06-20 | 2012-01-25 | 辽宁省电力有限公司丹东供电公司 | Electric energy meter on-line detection method |
| CN102426346A (en) * | 2011-10-19 | 2012-04-25 | 上海仪器仪表研究所 | Power meter phase detection control system |
| CN102628892A (en) * | 2012-04-12 | 2012-08-08 | 广东电网公司中山供电局 | Method for calculating voltage-loss unusual electrical energy measurement on line and electric energy meter |
| CN102628892B (en) * | 2012-04-12 | 2014-06-04 | 广东电网公司中山供电局 | Method for calculating voltage-loss unusual electrical energy measurement on line and electric energy meter |
| CN102928659A (en) * | 2012-11-06 | 2013-02-13 | 昆山北极光电子科技有限公司 | High-precision power measuring circuit |
| CN103149430A (en) * | 2013-02-06 | 2013-06-12 | 陕西富集电力科技股份有限公司 | Electric energy pulse implementing method of electric energy meter |
| CN109683119A (en) * | 2018-12-19 | 2019-04-26 | 恒大智慧科技有限公司 | Electric energy measuring equipment automatic calibrating method, computer equipment and storage medium |
| CN109683119B (en) * | 2018-12-19 | 2022-07-19 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Automatic calibration method for electric energy metering equipment, computer equipment and storage medium |
| CN110308415A (en) * | 2019-07-05 | 2019-10-08 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | The error compensating method and device of electric energy metered system |
| CN114002643A (en) * | 2021-11-25 | 2022-02-01 | 国网北京市电力公司 | Electric energy meter detection method and device, electronic equipment and computer readable storage medium |
| CN114296023A (en) * | 2021-12-27 | 2022-04-08 | 广西电网有限责任公司 | Low-voltage transformer area metering device operation error diagnosis and analysis method and system |
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