CN106645930A - Three-phase four-wire electric energy metering device having null line missing detection function - Google Patents
Three-phase four-wire electric energy metering device having null line missing detection function Download PDFInfo
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- CN106645930A CN106645930A CN201611037422.1A CN201611037422A CN106645930A CN 106645930 A CN106645930 A CN 106645930A CN 201611037422 A CN201611037422 A CN 201611037422A CN 106645930 A CN106645930 A CN 106645930A
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- 238000001514 detection method Methods 0.000 title claims abstract description 74
- 230000007935 neutral effect Effects 0.000 claims description 144
- 238000000034 method Methods 0.000 claims description 95
- 230000005611 electricity Effects 0.000 claims description 23
- 230000001939 inductive effect Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000009434 installation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/002—Measuring real component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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Abstract
The invention relates to the technical field of electrical measurement and more particularly to a three-phase four-wire electric energy metering device having a null line missing detection function. The three-phase four-wire electric energy metering device comprises a three-phase four-wire energy metering processing circuit, a null line current sensor, a null line missing signal processing circuit, and a three-phase four-wire power supply circuit. The three-phase four-wire electric energy metering processing circuit samples a three-phase input voltage signal and a three-phase input current signal and calculates a grid parameter. The null line missing signal processing circuit samples the output signal of the null line current sensor and calculates the null line current of the three-phase four-wire power supply circuit. When the null line current of the three-phase four-wire power supply circuit is smaller than a set null line missing current threshold value, the null line missing signal processing circuit outputs a null line missing signal. Compared with the prior art, the three-phase four-wire electric energy metering device eliminates an influence of the installation of an null line current transformer on the measurement accuracy of the grid parameter of the three-phase four-wire energy metering device.
Description
Technical field
The present invention relates to electrotechnical measurement technical field, more particularly to a kind of electricity of the three-phase and four-line with scarce zero line detection function
Can metering device.
Background technology
Three-phase and four-line electric power meter comes what measuring power user used used in existing three phase and four wire circuit system
The three-phase of power consumption, the three-phase voltage input of three-phase and four-line electric power meter and zero line side and three phase and four wire circuit system
Pressure-wire terminal and zero line side are connected, three-phase current input and the measurement three-phase four-wire system of three-phase and four-line electric power meter
When the outfan of the power current transformer of electric power system is connected, three-phase and four-line electric power meter is to three-phase four-wire power supply
System measure and calculate three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power,
The electrical network parameters such as three-phase active energy amount, three-phase reactive energy amount, when zero line and the three-phase four of three-phase and four-line electric power meter
When the zero line of line electric power system disconnects, then the zero line of three-phase and four-line electric power meter can occur dielectric displacement, directly affect three
The certainty of measurement of the electrical network parameter of the line electric power meter of phase four, it is therefore desirable to detect the zero of three-phase and four-line electric power meter
Whether line is connected to the zero line of three phase and four wire circuit system, when the zero line that three-phase and four-line electric power meter occurs and three-phase four
When the zero line of line electric power system disconnects, there is provided lack zero line alarm signal.
Chinese patent CN100588977C provides a kind of three in " the lacking zero detection method and device of a kind of three-phase circuit "
The line intelligent electric energy meter of phase four lacks zero detection circuit and detection method, as shown in figure 1, including optocoupler, neutral line current transformer and
Signal processing circuit, by the art solutions be applied to detect whether three-phase and four-line electric power meter lacks zero line when circuit
Figure using neutral line current transformer as shown in Fig. 2 concatenate the neutral line current into three-phase and four-line electric power meter, signal processing electricity
Road judges whether three-phase and four-line electric power meter there occurs scarce zero line by whether having electric current on detection zero line, in zero line electricity
The primary side of current transformer can produce a less signal voltage make the zero line of three-phase and four-line electric power meter can occur compared with
Little dielectric displacement, impacts to the certainty of measurement of the electrical network parameter of three-phase and four-line electric power meter.
The content of the invention
The invention aims to solve the not enough of above-mentioned technology and provide a kind of with scarce zero line detection function three
The line electric power meter of phase four, according to the three-phase four-wire power with the three-phase and four-line electric power meter for lacking zero line detection function
Whether the size of the neutral line current of circuit lacks zero line judging three-phase and four-line electric power meter, eliminates in prior art and accesses
Neutral line current transformer on caused by the certainty of measurement of the electrical network parameter of three-phase and four-line electric power meter affect.
In order to achieve the above object, the present invention adopts following several technical schemes：
The first technical scheme is：A kind of three-phase and four-line electric power meter with scarce zero line detection function, including：Three-phase four
Line electric energy metrical process circuit, lacks neutral signal process circuit, three-phase four-wire power circuit, neutral line current sensor；
The three-phase voltage signal input and common port of the three-phase and four-line electric energy metrical process circuit is connected to scarce zero line
The three-phase voltage input and zero line input of the three-phase and four-line electric power meter of detection function, the three-phase and four-line electric energy meter
The three-phase current signal input of amount process circuit is connected to the three-phase and four-line electric power meter for lacking zero line detection function
Three-phase current input, the three-phase and four-line electric energy metrical process circuit is to three-phase input voltage signal and three-phase input current
Signal is sampled, calculate three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power, three
The electrical network parameters such as phase active energy amount, three-phase reactive energy amount；
The three-phase voltage input of the three-phase four-wire power circuit is connected to the three-phase and four-line electricity for lacking zero line detection function
The three-phase voltage input of energy metering device, the three-phase four-wire power circuit is to the three-phase and four-line electric energy metrical process circuit
Working power is provided with the scarce neutral signal process circuit；
One end of the input of the neutral line current sensor is connected to the three-phase and four-line electric energy meter for lacking zero line detection function
The zero line input of amount device, the other end of the input of the neutral line current sensor is connected to the three-phase four-wire power electricity
The zero line input on road；
The input of the scarce neutral signal process circuit is connected to the outfan of the neutral line current sensor, the scarce zero line
Signal processing circuit is sampled to the output signal of the neutral line current sensor and is calculated three-phase four-wire power electricity
The neutral line current on road, it is described when the neutral line current of the three-phase four-wire power circuit is less than the scarce neutral line current threshold values for arranging
Scarce neutral signal process circuit output lacks neutral signal.
The neutral line current sensor is resistance；
Because the common port of the three-phase and four-line electric energy metrical process circuit is by with the three-phase and four-line for lacking zero line detection function
The zero line input of electric power meter is connected to the zero line of three phase and four wire circuit system, at the three-phase and four-line electric energy metrical
Reason circuit can accurately measure electrical network parameter, and the input of the neutral line current sensor be connected to lack zero line inspection
The zero line input of the zero line input of the three-phase and four-line electric power meter of brake and the three-phase four-wire power circuit, because
Signal voltage produced by the primary side of this neutral line current sensor for accessing will not be processed the three-phase and four-line electric energy metrical
The certainty of measurement of the electrical network parameter of circuit is impacted.
Second technical scheme be：A kind of three-phase and four-line electric power meter with scarce zero line detection function, including：Three
The line electric energy metrical process circuit of phase four, scarce neutral signal process circuit, three-phase four-wire power circuit, neutral line current sensor, partially
Put load；
The three-phase voltage signal input and common port of the three-phase and four-line electric energy metrical process circuit is connected to scarce zero line
The three-phase voltage input and zero line input of the three-phase and four-line electric power meter of detection function, the three-phase and four-line electric energy meter
The three-phase current signal input of amount process circuit is connected to the three-phase and four-line electric power meter for lacking zero line detection function
Three-phase current input, the three-phase and four-line electric energy metrical process circuit is to three-phase input voltage signal and three-phase input current
Signal is sampled, calculate three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power, three
The electrical network parameters such as phase active energy amount, three-phase reactive energy amount；
The three-phase voltage input of the three-phase four-wire power circuit is connected to the three-phase and four-line electricity for lacking zero line detection function
The three-phase voltage input of energy metering device, the three-phase four-wire power circuit is to the three-phase and four-line electric energy metrical process circuit
Working power is provided with the scarce neutral signal process circuit；
One end of the offset load is connected to the arbitrary phase with the three-phase and four-line electric power meter for lacking zero line detection function
Voltage input end, the other end of the offset load is connected to the zero line input of the three-phase four-wire power circuit；
One end of the input of the neutral line current sensor is connected to the three-phase and four-line electric energy meter for lacking zero line detection function
The zero line input of amount device, the other end of the input of the neutral line current sensor is connected to the three-phase four-wire power electricity
The zero line input on road；
The input of the scarce neutral signal process circuit is connected to the outfan of the neutral line current sensor, the scarce zero line
Signal processing circuit is sampled to the output signal of the neutral line current sensor and is calculated and flow through the neutral line current biography
The electric current of sensor, it is described to lack zero when the electric current of the neutral line current sensor is flow through less than the scarce neutral line current threshold values for arranging
The output of line signal processing circuit lacks neutral signal.
The neutral line current sensor is resistance；
The offset load can be resistive load, or capacitive load, or inductive load；
Increase offset load the reason for be：If the neutral line current of the three-phase four-wire power circuit is too small, it is impossible to meet
The measurement requirement of the scarce neutral signal process circuit, then need that an offset load is connected to scarce zero line detection function
Three-phase and four-line electric power meter three-phase voltage input in any voltage input and the three-phase four-wire power electricity
The zero line input on road, for increasing the electric current for flowing through the neutral line current sensor, is processed with meeting the scarce neutral signal
The measurement requirement of circuit.
The third technical scheme is：A kind of three-phase and four-line electric power meter with scarce zero line detection function, including：Three
The line electric energy metrical process circuit of phase four, lacks neutral signal process circuit, and auxiliary power circuit, neutral line current sensor, biasing is negative
Carry；
The three-phase voltage signal input and common port of the three-phase and four-line electric energy metrical process circuit is connected to scarce zero line
The three-phase voltage input and zero line input of the three-phase and four-line electric power meter of detection function, the three-phase and four-line electric energy meter
The three-phase current signal input of amount process circuit is connected to the three-phase and four-line electric power meter for lacking zero line detection function
Three-phase current input, the three-phase and four-line electric energy metrical process circuit is to three-phase input voltage signal and three-phase input current
Signal is sampled, calculate three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power, three
The electrical network parameters such as phase active energy amount, three-phase reactive energy amount；
The input of the auxiliary power circuit is connected to the three-phase and four-line electric power meter for lacking zero line detection function
Accessory power supply input, the auxiliary power circuit is to the three-phase and four-line electric energy metrical process circuit and the scarce neutral signal
Process circuit provides working power；
One end of the input of the neutral line current sensor is connected with one end of the offset load, and the neutral line current is passed
The other end of the input of sensor is connected to the input of the zero line with the three-phase and four-line electric power meter for lacking zero line detection function
End, the other end of the offset load is connected to the arbitrary phase with the three-phase and four-line electric power meter for lacking zero line detection function
Voltage input end；
The input of the scarce neutral signal process circuit is connected to the outfan of the neutral line current sensor, the scarce zero line
Signal processing circuit is sampled to the output signal of the neutral line current sensor and is calculated and flow through the neutral line current biography
The electric current of sensor, it is described to lack zero when the electric current of the neutral line current sensor is flow through less than the scarce neutral line current threshold values for arranging
The output of line signal processing circuit lacks neutral signal.
The neutral line current sensor is resistance；
The offset load can be resistive load, or capacitive load, or inductive load；
A kind of three-phase and four-line electric power meter with scarce zero line detection function provided by the present invention, with prior art phase
Than because the common port of the three-phase and four-line electric energy metrical process circuit is by with the three-phase and four-line electricity for lacking zero line detection function
The zero line input of energy metering device is connected to the zero line of three phase and four wire circuit system, and the three-phase and four-line electric energy metrical is processed
Circuit can accurately measure electrical network parameter, the signal voltage of the input of the neutral line current sensor will not be to described three
The certainty of measurement of the electrical network parameter of the line electric energy metrical process circuit of phase four is impacted, so as to eliminate prior art in access
Neutral line current transformer caused by the certainty of measurement of the electrical network parameter of three-phase and four-line electric power meter on affecting.
Description of the drawings
Fig. 1 is the theory diagram for lacking zero line detection circuit of Chinese patent CN100588977C；
Fig. 2 is scarce zero of the three-phase and four-line electric power meter designed by the technical scheme using Chinese patent CN100588977C
The theory diagram of line detection circuit；
Fig. 3 is the theory diagram of embodiments of the invention 1；
Fig. 4 is the theory diagram of the scarce neutral signal process circuit of embodiments of the invention 1；
Fig. 5 is the theory diagram of embodiments of the invention 2；
Fig. 6 is the theory diagram of embodiments of the invention 3.
Specific embodiment
The invention will be further described to combine accompanying drawing below by embodiment.
Embodiment 1：
As shown in figure 3, a kind of three-phase and four-line electric power meter with scarce zero line detection function, including：Three-phase and four-line electric energy
Metering process circuit 1, lacks neutral signal process circuit 2, three-phase four-wire power circuit 3, neutral line current sensor 4；
Three-phase voltage signal input ua+, ub+, uc+ and common port Vcom of the three-phase and four-line electric energy metrical process circuit 1
It is connected to three-phase voltage input Ua, Ub, Uc and zero line of the three-phase and four-line electric power meter with zero line detection function is lacked
Input Un, three-phase current signal input ia+, ia-, ib+, ib-, ic of the three-phase and four-line electric energy metrical process circuit 1
+, ic- be connected to lack zero line detection function three-phase and four-line electric power meter three-phase current input Ia+, Ia-, Ib
+, Ib-, Ic+, Ic-, the three-phase and four-line electric energy metrical process circuit 1 believed three-phase input voltage signal and three-phase input current
Number sampled, calculated three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power, three-phase
The electrical network parameters such as active energy amount, three-phase reactive energy amount；
The three-phase voltage input of the three-phase four-wire power circuit 3 is connected to the three-phase and four-line electricity for lacking zero line detection function
Three-phase voltage input Ua, Ub, Uc of energy metering device, the three-phase four-wire power circuit 3 is used for three-phase and four-line electricity
Process circuit 1 can be measured and the scarce neutral signal process circuit 2 provides working power；
One end of the input of the neutral line current sensor 4 is connected to the three-phase and four-line electric energy meter for lacking zero line detection function
The zero line input Un of amount device, the other end of the input of the neutral line current sensor 4 is connected to the three-phase and four-line electricity
The zero line input N of source circuit 3；
The input of the scarce neutral signal process circuit 2 is connected to the outfan of the neutral line current sensor 4, described to lack zero
The output signal of the neutral line current sensor 4 of line signal processing circuit 2 pairs is sampled and is calculated three-phase and four-line electricity
The neutral line current of source circuit 3, when the neutral line current of the three-phase four-wire power circuit 3 is less than the scarce neutral line current threshold values for arranging
When, the scarce output of neutral signal process circuit 2 lacks neutral signal.
Because the common port of the three-phase and four-line electric energy metrical process circuit 1 is by with the three-phase for lacking zero line detection function
The zero line input of four line electric power meters is connected to the zero line of three phase and four wire circuit system, therefore the neutral line current is passed
The signal voltage of the input of sensor 4 will not be to the measurement of the electrical network parameter of the three-phase and four-line electric energy metrical process circuit 1 essence
Degree is impacted.
The simply scarce neutral signal process circuit of as shown in Figure 4 one for the scarce neutral signal process circuit 2, institute
It is sampling resistor R0 to state neutral line current sensor 4, and the two ends of sampling resistor R0 are connected respectively to scarce zero line detection function
The zero line input N of the zero line input Un of three-phase and four-line electric power meter and the three-phase four-wire power circuit 3, sampling electricity
The two ends of resistance R0 are sampled signal outfan, are connected to the computation chip of the three-phase and four-line electric energy metrical process circuit 1
The V0P ends of 0 passage of ATT7022E, the V0N ends of 0 passage of computation chip ATT7022E are connected to the three-phase four by resistance
The common port Vcom of line electric energy metrical process circuit 1, the scarce neutral signal process circuit 2 is by spi bus from computation chip
The neutral line current of the three-phase four-wire power circuit 3 measured by 0 passage is read in ATT7022E, when the three-phase four-wire power
When the neutral line current of circuit 3 is less than the scarce neutral line current threshold values for arranging, the scarce output of neutral signal process circuit 2 lacks zero line letter
Number.
Embodiment 2
As shown in figure 5, a kind of three-phase and four-line electric power meter with scarce zero line detection function, including：Three-phase and four-line electric energy
Metering process circuit 1, lacks neutral signal process circuit 2, three-phase four-wire power circuit 3, neutral line current sensor 4, offset load
5；
Three-phase voltage signal input ua+, ub+, uc+ and common port Vcom of the three-phase and four-line electric energy metrical process circuit 1
It is connected to three-phase voltage input Ua, Ub, Uc and zero line of the three-phase and four-line electric power meter with zero line detection function is lacked
Input Un, three-phase current signal input ia+, ia-, ib+, ib-, ic of the three-phase and four-line electric energy metrical process circuit 1
+, ic- be connected to lack zero line detection function three-phase and four-line electric power meter three-phase current input Ia+, Ia-, Ib
+, Ib-, Ic+, Ic-, the three-phase and four-line electric energy metrical process circuit 1 believed three-phase input voltage signal and three-phase input current
Number sampled, calculated three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power, three-phase
The electrical network parameters such as active energy amount, three-phase reactive energy amount；
The three-phase voltage input of the three-phase four-wire power circuit 3 is connected to the three-phase and four-line electricity for lacking zero line detection function
Three-phase voltage input Ua, Ub, Uc of energy metering device, the three-phase four-wire power circuit 3 is used for three-phase and four-line electricity
Process circuit 1 can be measured and the scarce neutral signal process circuit 2 provides working power；
The two ends of the offset load 5 are connected respectively to the C with the three-phase and four-line electric power meter for lacking zero line detection function
The zero line input N of phase voltage input Uc and the three-phase four-wire power circuit 3.
One end of the input of the neutral line current sensor 4 is connected to the three-phase and four-line electricity for lacking zero line detection function
The zero line input Un of energy metering device, the other end of the input of the neutral line current sensor 4 is connected to the three-phase four
The zero line input N of line power circuit 3；
The input of the scarce neutral signal process circuit 2 is connected to the outfan of the neutral line current sensor 4, described to lack zero
The output signal of the neutral line current sensor 4 of line signal processing circuit 2 pairs is sampled and is calculated and flow through the zero line electricity
The electric current of flow sensor 4, when the electric current of the neutral line current sensor 4 is flow through less than the scarce neutral line current threshold values for arranging, institute
State the scarce output of neutral signal process circuit 2 and lack neutral signal.
Embodiment 3
As shown in fig. 6, a kind of three-phase and four-line electric power meter with scarce zero line detection function, including：Three-phase and four-line electric energy
Metering process circuit 1, lacks neutral signal process circuit 2, auxiliary power circuit 3, neutral line current sensor 4, offset load 5；
Three-phase voltage signal input ua+, ub+, uc+ and common port Vcom of the three-phase and four-line electric energy metrical process circuit 1
It is connected to three-phase voltage input Ua, Ub, Uc and zero line of the three-phase and four-line electric power meter with zero line detection function is lacked
Input Un, three-phase current signal input ia+, ia-, ib+, ib-, ic of the three-phase and four-line electric energy metrical process circuit 1
+, ic- be connected to lack zero line detection function three-phase and four-line electric power meter three-phase current input Ia+, Ia-, Ib
+, Ib-, Ic+, Ic-, the three-phase and four-line electric energy metrical process circuit 1 believed three-phase input voltage signal and three-phase input current
Number sampled, calculated three-phase voltage virtual value, three-phase current virtual value, three phases active power, three phase reactive power, three-phase
The electrical network parameters such as active energy amount, three-phase reactive energy amount；
The input of the auxiliary power circuit 3 is connected to the three-phase and four-line electric power meter for lacking zero line detection function
Accessory power supply input L1 and L2, the three-phase four-wire power circuit 3 is to the three-phase and four-line electric energy metrical process circuit 1 and institute
State scarce neutral signal process circuit 2 and working power is provided；
One end of the input of the neutral line current sensor 4 is connected with one end of the offset load 5, the neutral line current
The zero line that the other end of the input of sensor 4 is connected to the three-phase and four-line electric power meter for lacking zero line detection function is defeated
Enter and hold Un, the other end of the offset load 5 is connected to the C with the three-phase and four-line electric power meter for lacking zero line detection function
Phase voltage input Uc；
The input of the scarce neutral signal process circuit 2 is connected to the outfan of the neutral line current sensor 4, described to lack zero
The output signal of the neutral line current sensor 4 of line signal processing circuit 2 pairs is sampled and is calculated and flow through the zero line electricity
The electric current of flow sensor 4, when the electric current of the neutral line current sensor 4 is flow through less than the scarce neutral line current threshold values for arranging, institute
State the scarce output of neutral signal process circuit 2 and lack neutral signal.
Claims (8)
1. a kind of three-phase and four-line electric power meter with scarce zero line detection function, is characterized in that：Including three-phase and four-line electric energy
Metering process circuit, lacks neutral signal process circuit, three-phase four-wire power circuit, neutral line current sensor；The three-phase and four-line
The three-phase voltage signal input of electric energy metrical process circuit and common port are connected to the three-phase four for lacking zero line detection function
The three-phase voltage input and zero line input of line electric power meter, the three-phase of the three-phase and four-line electric energy metrical process circuit
Current signal input is connected to the three-phase current input with the three-phase and four-line electric power meter for lacking zero line detection function,
The three-phase and four-line electric energy metrical process circuit is sampled and is counted to three-phase input voltage signal and three-phase input current signal
Calculate electrical network parameter；The three-phase voltage input of the three-phase four-wire power circuit is connected to scarce zero line detection function three
The three-phase voltage input of the line electric power meter of phase four, the three-phase four-wire power circuit is to the three-phase and four-line electric energy metrical
Process circuit and the scarce neutral signal process circuit provide working power；One end of the input of the neutral line current sensor
It is connected to the zero line input with the three-phase and four-line electric power meter for lacking zero line detection function, the neutral line current sensor
The other end of input be connected to the zero line input of the three-phase four-wire power circuit；The scarce neutral signal process circuit
Input be connected to the outfan of the neutral line current sensor, the scarce neutral signal process circuit is to the neutral line current
The output signal of sensor is sampled and is calculated the neutral line current of the three-phase four-wire power circuit, when the three-phase and four-line
When the neutral line current of power circuit is less than the scarce neutral line current threshold values for arranging, the scarce neutral signal process circuit output lacks zero line
Signal.
2. a kind of three-phase and four-line electric power meter with scarce zero line detection function according to claim 1, its feature
It is：The neutral line current sensor is resistance.
3. a kind of three-phase and four-line electric power meter with scarce zero line detection function, is characterized in that：Including three-phase and four-line electric energy
Metering process circuit, lacks neutral signal process circuit, three-phase four-wire power circuit, neutral line current sensor, offset load；It is described
The three-phase voltage signal input and common port of three-phase and four-line electric energy metrical process circuit is connected to scarce zero line detection function
Three-phase and four-line electric power meter three-phase voltage input and zero line input, the three-phase and four-line electric energy metrical processes electricity
The three-phase current signal input on road is connected to the three-phase electricity with the three-phase and four-line electric power meter for lacking zero line detection function
Stream input, the three-phase and four-line electric energy metrical process circuit is carried out to three-phase input voltage signal and three-phase input current signal
Sample and calculate electrical network parameter；The three-phase voltage input of the three-phase four-wire power circuit is connected to scarce zero line detection
The three-phase voltage input of the three-phase and four-line electric power meter of function, the three-phase four-wire power circuit is to the three-phase and four-line
Electric energy metrical process circuit and the scarce neutral signal process circuit provide working power；One end of the offset load is connected to
Arbitrary phase voltage input of the three-phase and four-line electric power meter with scarce zero line detection function, the offset load it is another
End is connected to the zero line input of the three-phase four-wire power circuit；One end connection of the input of the neutral line current sensor
To with lack zero line detection function three-phase and four-line electric power meter zero line input, the neutral line current sensor it is defeated
The other end for entering end is connected to the zero line input of the three-phase four-wire power circuit；The scarce neutral signal process circuit it is defeated
Enter the outfan that end is connected to the neutral line current sensor, the scarce neutral signal process circuit is sensed to the neutral line current
The output signal of device is sampled and is calculated the electric current that flows through the neutral line current sensor, is passed when the neutral line current is flow through
When the electric current of sensor is less than the scarce neutral line current threshold values for arranging, the scarce neutral signal process circuit output lacks neutral signal.
4. a kind of three-phase and four-line electric power meter with scarce zero line detection function according to claim 3, its feature
It is：The neutral line current sensor is resistance.
5. a kind of three-phase and four-line electric power meter with scarce zero line detection function according to claim 3, its feature
It is：The offset load is resistive load, or capacitive load, or inductive load.
6. a kind of three-phase and four-line electric power meter with scarce zero line detection function, is characterized in that：Including three-phase and four-line electric energy
Metering process circuit, lacks neutral signal process circuit, auxiliary power circuit, neutral line current sensor, offset load；The three-phase
The three-phase voltage signal input and common port of four line electric energy metrical process circuits is connected to scarce zero line detection function three
The three-phase voltage input and zero line input of the line electric power meter of phase four, the three-phase and four-line electric energy metrical process circuit
The three-phase current that three-phase current signal input is connected to the three-phase and four-line electric power meter for lacking zero line detection function is defeated
Enter end, the three-phase and four-line electric energy metrical process circuit is sampled to three-phase input voltage signal and three-phase input current signal
And calculate electrical network parameter；The input of the auxiliary power circuit is connected to the three-phase and four-line electricity for lacking zero line detection function
The accessory power supply input of energy metering device, the auxiliary power circuit is to the three-phase and four-line electric energy metrical process circuit and institute
State scarce neutral signal process circuit and working power is provided；One end of the input of the neutral line current sensor and the biasing are negative
One end of load is connected, and the other end of the input of the neutral line current sensor is connected to scarce zero line detection function three
The zero line input of the line electric power meter of phase four, the other end of the offset load is connected to scarce zero line detection function
Arbitrary phase voltage input of three-phase and four-line electric power meter；The input of the scarce neutral signal process circuit is connected to institute
State the outfan of neutral line current sensor, output signal of the scarce neutral signal process circuit to the neutral line current sensor
Sampled and calculated the electric current for flowing through the neutral line current sensor, when the electric current for flowing through the neutral line current sensor it is little
When the scarce neutral line current threshold values for arranging, the scarce neutral signal process circuit output lacks neutral signal.
7. a kind of three-phase and four-line electric power meter with scarce zero line detection function according to claim 6, its feature
It is：The neutral line current sensor is resistance.
8. a kind of three-phase and four-line electric power meter with scarce zero line detection function according to claim 6, its feature
It is：The offset load is resistive load, or capacitive load, or inductive load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611037422.1A CN106645930A (en) | 2016-11-23 | 2016-11-23 | Three-phase four-wire electric energy metering device having null line missing detection function |
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| CN201611037422.1A CN106645930A (en) | 2016-11-23 | 2016-11-23 | Three-phase four-wire electric energy metering device having null line missing detection function |
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| CN201611037422.1A Pending CN106645930A (en) | 2016-11-23 | 2016-11-23 | Three-phase four-wire electric energy metering device having null line missing detection function |
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| CN109030935A (en) * | 2018-08-10 | 2018-12-18 | 国网湖南省电力有限公司 | A kind of three-phase and four-line intelligent meter of independent measurement neutral line current |
| CN110988779A (en) * | 2019-11-04 | 2020-04-10 | 广西电网有限责任公司 | Method and system for detecting zero line lacking function of three-phase four-wire electric energy meter |
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