CN102023270A - Intelligent power network parameter sensor - Google Patents
Intelligent power network parameter sensor Download PDFInfo
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- CN102023270A CN102023270A CN 201010552957 CN201010552957A CN102023270A CN 102023270 A CN102023270 A CN 102023270A CN 201010552957 CN201010552957 CN 201010552957 CN 201010552957 A CN201010552957 A CN 201010552957A CN 102023270 A CN102023270 A CN 102023270A
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Abstract
The invention relates to an intelligent power network parameter sensor, which comprises a voltage sensor, a current sensor, an analog-digital converter and a digital signal processor, wherein the voltage sensor and the current sensor are respectively connected with the digital signal processor through the analog-digital converter; and the digital signal processor is provided with a communication interface used for outputting power network parameters. The voltage sensor, the current sensor, the analog-digital converter and the digital signal processor are combined in the intelligent power network parameter sensor, the length of a connecting wire between the current sensor and the analog-digital converter is reduced, the influence of an external electromagnetic field on measurement errors of power network parameters of an intelligent ammeter is reduced, the antijamming capability is high, intelligent power network parameter sensors between intelligent ammeters can be interchanged and the measurement errors of the power network parameters of the intelligent ammeters are not needed to be re-calibrated.
Description
Technical field
The present invention relates to the electrical network parameter sampling field of intelligent electric meter, particularly a kind of electrical network parameter intelligence sensor.
Background technology
Intelligent electric meter comprises voltage sensor, current sensor, analog to digital converter, digital signal processor, data-carrier store, button, display, communicating circuit, power circuit etc.Voltage sensor is used for the voltage of tested voltage circuit is converted into analog voltage signal; Current sensor is used for the electric current of tested current return is converted into analog voltage signal; Analog to digital converter is used for the analog voltage signal of the analog voltage signal of voltage sensor output and current sensor output is converted into digital signal; Digital signal processor is used for the digital signal of analog to digital converter output is handled, calculate and the output electrical network parameter, as voltage, electric current, frequency, active power, reactive power, applied power, active energy, reactive energy etc., and parameters such as electric energy data are stored in data-carrier store, on display, show the parameter of relevant intelligent electric meter by button; Communicating circuit is used for carrying out data communication with external unit; Power circuit is used to provide working power.
Current sensor is installed on the terminal board of intelligent electric meter usually, and the output terminal of current sensor is connected with analog to digital converter input end on the intelligent electric meter circuit board by connecting lead.Owing to need long signal to transmit between the analog to digital converter on current sensor and the circuit board to be connected lead to come transmission of analogue signal, thereby introduce the interference of external electromagnetic field easily, the measuring error of the electrical network parameter of intelligent electric meter is exerted an influence.
In addition, the measuring error of the electrical network parameter of intelligent electric meter is through after calibrating, the voltage sensor of intelligent electric meter and current sensor can not exchange with the voltage sensor and the current sensor of other intelligent electric meter, otherwise need calibrate again the measuring error of the electrical network parameter of intelligent electric meter.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of electrical network parameter intelligence sensor, reduced the influence of measurement error of external electromagnetic field to the electrical network parameter of intelligent electric meter, realized the digitized sampling of voltage and current signal, simultaneously the electrical network parameter intelligence sensor between intelligent electric meter can exchange and not need the measuring error of the electrical network parameter of intelligent electric meter is calibrated again.
The present invention solves the technical scheme that present technical matters adopts: it comprises: a voltage sensor that is used for input voltage is converted into analog voltage signal, a current sensor that is used for input current is converted into analog voltage signal, the analog to digital converter that the analog voltage signal that is used for voltage sensor output is converted into digital voltage signal and the analog voltage signal of current sensor output is converted into the digital current signal, one is used for electrical network parameter was handled and calculated and exported to the digital voltage signal and the digital current signal of analog to digital converter output digital signal processor, through analog to digital converter linking number word signal processor, digital signal processor is provided with the communication interface that is used to export electrical network parameter respectively for voltage sensor and current sensor.Electrical network parameter such as voltage that digital signal processor calculates and exports, electric current, frequency, the phase differential between voltage and electric current, active power, reactive power, applied power, active energy, reactive energy etc.
Preferably, described digital signal processor also is provided with the active energy pulse output end mouth or the reactive energy pulse output end mouth port of the measuring error that is used for the verification electrical network parameter.
Preferably, described voltage sensor is electric resistance partial pressure type voltage sensor or voltage transformer (VT), and described current sensor is shunt or electromagnetic current transducer or coil type current transformer.
Preferably, described current sensor comprises first current sensor and second current sensor that is used for the second road input current is converted into analog voltage signal that are used for first via input current is converted into analog voltage signal, and first current sensor and second current sensor are respectively through analog to digital converter linking number word signal processor.Analog to digital converter is converted into the first via digital current signal and the second way word current signal with the analog voltage signal of first current sensor and the output of second current sensor, digital signal processor compares the size of the first via digital current signal and the second way word current signal, select the first via digital current signal or the second way word current signal to carry out electrical network parameter such as voltage, electric current, frequency, phase differential between voltage and electric current, active power, reactive power, applied power, active energy, calculating such as reactive energy, digital signal processor is exported electrical network parameter by communication interface.
Preferably, described voltage sensor comprises first voltage sensor that is used for A phase input voltage is converted into analog voltage signal, second voltage sensor that is used for B phase input voltage is converted into analog voltage signal with one be used for C mutually input voltage be converted into the tertiary voltage sensor of analog voltage signal, described current sensor comprises first current sensor that is used for A phase input current is converted into analog voltage signal, second current sensor that is used for B phase input current is converted into analog voltage signal with one be used for C mutually input current be converted into the 3rd current sensor of analog voltage signal, described first voltage sensor, second voltage sensor, the tertiary voltage sensor, first current sensor, second current sensor and the 3rd current sensor are respectively through analog to digital converter linking number word signal processor.
Preferably, described voltage sensor comprise first voltage sensor that is used for A phase input voltage is converted into analog voltage signal with one be used for C mutually input voltage be converted into second voltage sensor of analog voltage signal, described current sensor comprise first current sensor that is used for A phase input current is converted into analog voltage signal with one be used for C mutually input current be converted into second current sensor of analog voltage signal, described first voltage sensor, second voltage sensor, first current sensor and second current sensor are respectively through analog to digital converter linking number word signal processor.
Preferably, described electrical network parameter intelligence sensor also comprises a storer that is used for the measuring error calibration data of store electricity network parameters, and storer is connected with digital signal processor.The measuring error calibration data that digital signal processor reads the electrical network parameter in the storer is used for the measuring error of electrical network parameter is revised.
Preferably, described electrical network parameter intelligence sensor also comprises a temperature sensor that is used for the testing environment temperature, and temperature sensor is connected with digital signal processor.The ambient temperature measurement value of digital signal processor reading temperature sensor is used for the measuring error of electrical network parameter is carried out temperature compensation.
Preferably, described electrical network parameter intelligence sensor also comprises a CT short-circuit detecting circuit that is used to detect front end CT wiring state, and the input end of CT short-circuit detecting circuit is connected with input current, and the output terminal of CT short-circuit detecting circuit is connected with digital signal processor.Whether digital signal processor reads the output signal of CT short-circuit detecting circuit and carries out the judgement of CT wiring state, identify CT and be short-circuited, and digital signal processor is by communication interface output electrical network parameter and CT wiring state.
Preferably, described electrical network parameter intelligence sensor comprises that also also comprising one is used to make digital signal processor and external communications equipment to keep the electrical isolation circuit of electrical isolation, and the electrical isolation circuit is connected with digital signal processor.External communications equipment reads the electrical network parameter of electrical network parameter intelligence sensor by the electrical isolation circuit.
The invention has the beneficial effects as follows:
1, by voltage sensor, current sensor, analog to digital converter, bank of digital signal processors being combined in the electrical network parameter intelligence sensor, shortened the length of connecting line between current sensor and the analog to digital converter, reduced the influence of measurement error of external electromagnetic field to the electrical network parameter of intelligent electric meter, digital signal processor is exported electrical network parameter by communication interface, as voltage, electric current, frequency, phase differential, active power, reactive power, applied power, active energy, reactive energies etc. have been realized the digitized sampling of electrical network parameter;
2, still need the signal transmission to be connected lead between the digital signal processor of electrical network parameter intelligence sensor and intelligent electric meter, but since transmission be digital signal, so have the strong characteristics of antijamming capability; In addition, the electrical network parameter intelligence sensor between intelligent electric meter can exchange and need not to recalibrate the measuring error of the electrical network parameter of intelligent electric meter;
3, in the electrical network parameter intelligence sensor behind the combination CT short-circuit detecting circuit, can carry out the CT wiring state and detect;
4, in the electrical network parameter intelligence sensor behind the combination temp sensor, can the measuring error of the electrical network parameter in the operating temperature range be compensated, thereby guarantee the measuring accuracy of the electrical network parameter of electrical network parameter intelligence sensor in operating temperature range;
5, behind the employing electrical isolation circuit, can also make the internal circuit and the external unit communication of electrical network parameter intelligence sensor keep electrical isolation, external communications equipment reads the electrical network parameter of electrical network parameter intelligence sensor by the electrical isolation circuit of electrical network parameter intelligence sensor.
Description of drawings
Fig. 1 is the theory diagram of the embodiment of the invention 1.
Fig. 2 is the theory diagram of the embodiment of the invention 2.
Fig. 3 is the theory diagram of the embodiment of the invention 3.
Fig. 4 is the theory diagram of the embodiment of the invention 4.
Fig. 5 is the theory diagram of the embodiment of the invention 5.
Fig. 6 is the theory diagram of the embodiment of the invention 6.
Fig. 7 is the theory diagram of the embodiment of the invention 7.
Fig. 8 is the theory diagram of the embodiment of the invention 8.
Embodiment
The invention will be further described below in conjunction with embodiment, but protection scope of the present invention is not limited to this.
Embodiment 1
As shown in Figure 1, a kind of electrical network parameter intelligence sensor, comprise a voltage sensor 1 that is used for input voltage is converted into analog voltage signal, a current sensor 2 that is used for input current is converted into analog voltage signal, the analog to digital converter 3 that the analog voltage signal that is used for voltage sensor 1 output is converted into digital voltage signal and the analog voltage signal of current sensor 2 outputs is converted into the digital current signal, one is used for electrical network parameter was handled and calculated and exported to the digital voltage signal and the digital current signal of analog to digital converter 3 output digital signal processor 4, and digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter.
Digital signal processor 4 calculates as voltage, electric current, and frequency, the phase differential between voltage and electric current, active power, reactive power, applied power, active energy, electrical network parameters such as reactive energy, digital signal processor 4 is by communication interface output electrical network parameter.
Embodiment 2
As shown in Figure 2, a kind of electrical network parameter intelligence sensor, comprise that one is used for input voltage is converted into the voltage sensor 1 of analog voltage signal, first current sensor 21 and second current sensor 22 that is used for the second road input current is converted into analog voltage signal that is used for first via input current is converted into analog voltage signal, through analog to digital converter 3 linking number word signal processors 4, digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter respectively for first current sensor 21 and second current sensor 22.
Analog to digital converter 3 is converted into digital voltage signal with the analog voltage signal of voltage sensor 1 output, and the analog voltage signal of first current sensor 21 and 22 outputs of second current sensor is converted into the first via digital current signal and the second way word current signal.Digital signal processor 4 is relatively imported the size of the first via digital current signal and the second way word current signal, select the first via digital current signal or the second way word current signal to carry out electrical network parameter such as voltage, electric current, frequency, phase differential between voltage and electric current, active power, reactive power, applied power, active energy, calculating such as reactive energy, thus prevent the stealing incident, digital signal processor 4 is by communication interface output electrical network parameter, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.
Embodiment 3
As shown in Figure 3, a kind of electrical network parameter intelligence sensor, comprise first a voltage sensor 1A who is used for A phase input voltage is converted into analog voltage signal, a second voltage sensor 1B who is used for B phase input voltage is converted into analog voltage signal, a tertiary voltage sensor 1C who is used for C phase input voltage is converted into analog voltage signal, a first current sensor 2A who is used for A phase input current is converted into analog voltage signal, second current sensor 2B who is used for B phase input current is converted into analog voltage signal with one be used for C mutually input current be converted into the 3rd current sensor 2C of analog voltage signal, the described first voltage sensor 1A, the second voltage sensor 1B, tertiary voltage sensor 1C, the first current sensor 2A, through analog to digital converter 3 linking number word signal processors 4, digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter respectively for the second current sensor 2B and the 3rd current sensor 2C.
Analog to digital converter 3 is converted into A phase digital voltage signal, B phase digital voltage signal, C phase digital voltage signal with the analog voltage signal of voltage sensor 1A, voltage sensor 1B, voltage sensor 1C output, and the analog voltage signal that current sensor 2A, current sensor 2B, current sensor 2C are exported is converted into A phase digital current signal, B phase digital current signal, C phase digital current signal.Digital signal processor 4 calculates also electrical network parameters such as the phase differential between output voltage, electric current, frequency, voltage and electric current, active power, reactive power, applied power, active energy, reactive energy, digital signal processor 4 is by communication interface output electrical network parameter, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.
Embodiment 4
As shown in Figure 4, a kind of electrical network parameter intelligence sensor, comprise first a voltage sensor 1A who is used for A phase input voltage is converted into analog voltage signal, a second voltage sensor 1C who is used for C phase input voltage is converted into analog voltage signal, a first current sensor 2A who is used for A phase input current is converted into analog voltage signal, a second current sensor 2C who is used for C phase input current is converted into analog voltage signal, the described first voltage sensor 1A, the second voltage sensor 1C, through analog to digital converter 3 linking number word signal processors 4, digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter respectively for the first current sensor 2A and the second current sensor 2C.
Analog to digital converter is converted into A phase digital voltage signal, C phase digital voltage signal with the analog voltage signal of the first voltage sensor 1A, second voltage sensor 1C output, and the analog voltage signal that the first current sensor 2A, the second current sensor 2C are exported is converted into A phase digital current signal, C phase digital current signal.Digital signal processor 4 calculates also electrical network parameters such as the phase differential between output voltage, electric current, frequency, voltage and electric current, active power, reactive power, applied power, active energy, reactive energy, digital signal processor 4 is by communication interface output electrical network parameter, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.
Embodiment 5
As shown in Figure 5, a kind of electrical network parameter intelligence sensor, comprise a voltage sensor 1 that is used for input voltage is converted into analog voltage signal, a current sensor 2 that is used for input current is converted into analog voltage signal, the analog to digital converter 3 that the analog voltage signal that is used for voltage sensor 1 output is converted into digital voltage signal and the analog voltage signal of current sensor 2 outputs is converted into the digital current signal, through analog to digital converter 3 linking number word signal processors 4, digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter respectively for voltage sensor 1 and current sensor 2.Digital signal processor 4 is connected with a storer 5 that is used for the measuring error calibration data of store electricity network parameters.
Digital signal processor 4 calculates also electrical network parameters such as the phase differential between output voltage, electric current, frequency, voltage and electric current, active power, reactive power, applied power, active energy, reactive energy, digital signal processor 4 is by communication interface output electrical network parameter, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.The measuring error calibration data that digital signal processor 4 reads the electrical network parameter in the storer 5 is used for the measuring error of electrical network parameter is revised.
Embodiment 6
As shown in Figure 6, a kind of electrical network parameter intelligence sensor, comprise a voltage sensor 1 that is used for input voltage is converted into analog voltage signal, a current sensor 2 that is used for input current is converted into analog voltage signal, the analog to digital converter 3 that the analog voltage signal that is used for voltage sensor 1 output is converted into digital voltage signal and the analog voltage signal of current sensor 2 outputs is converted into the digital current signal, through analog to digital converter 3 linking number word signal processors 4, digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter respectively for voltage sensor 1 and current sensor 2.Digital signal processor 4 is connected with the storer 5 and the temperature sensor 6 that is used for the testing environment temperature that are used for the measuring error calibration data of store electricity network parameters.
Digital signal processor 4 calculates also electrical network parameters such as the phase differential between output voltage, electric current, frequency, voltage and electric current, active power, reactive power, applied power, active energy, reactive energy, digital signal processor 4 is by communication interface output electrical network parameter, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.The measuring error calibration data that digital signal processor 4 reads the electrical network parameter in the storer 5 is used for the measuring error of electrical network parameter is revised.The ambient temperature measurement value of digital signal processor 4 reading temperature sensors 6 is used for the measuring error of electrical network parameter is carried out temperature compensation.
Embodiment 7
As shown in Figure 7, a kind of electrical network parameter intelligence sensor, comprise a voltage sensor 1 that is used for input voltage is converted into analog voltage signal, a current sensor 2 that is used for input current is converted into analog voltage signal, the analog to digital converter 3 that the analog voltage signal that is used for voltage sensor 1 output is converted into digital voltage signal and the analog voltage signal of current sensor 2 outputs is converted into the digital current signal, a CT short-circuit detecting circuit 7 that is used to detect front end CT wiring state, voltage sensor 1 and current sensor 2 are respectively through analog to digital converter 3 linking number word signal processors 4, the input end of CT short-circuit detecting circuit 7 links to each other with input current, the output terminal of CT short-circuit detecting circuit 7 links to each other with digital signal processor 4, and digital signal processor 4 is provided with the communication interface that is used to export electrical network parameter.Digital signal processor 4 also is connected with the storer 5 and the temperature sensor 6 that is used for the testing environment temperature that are used for the measuring error calibration data of store electricity network parameters.
Digital signal processor 4 calculates also electrical network parameters such as the phase differential between output voltage, electric current, frequency, voltage and electric current, active power, reactive power, applied power, active energy, reactive energy, digital signal processor 4 is by communication interface output electrical network parameter and CT wiring state, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.The measuring error calibration data that digital signal processor 4 reads the electrical network parameter in the storer 5 is used for the measuring error of electrical network parameter is revised.The ambient temperature measurement value of digital signal processor 4 reading temperature sensors 6 is used for the measuring error of electrical network parameter is carried out temperature compensation.Digital signal processor 4 reads the output signal of CT short-circuit detecting circuit 7 and carries out the identification of CT wiring state, detects the CT connection circuit whether short circuit has taken place.
Embodiment 8
As shown in Figure 8, a kind of electrical network parameter intelligence sensor comprises a voltage sensor 1 that is used for input voltage is converted into analog voltage signal, a current sensor 2 that is used for input current is converted into analog voltage signal, the analog to digital converter 3 that the analog voltage signal that is used for voltage sensor 1 output is converted into digital voltage signal and the analog voltage signal of current sensor 2 outputs is converted into the digital current signal, one is used for electrical network parameter was handled and calculated and exported to the digital voltage signal and the digital current signal of analog to digital converter 3 output digital signal processor 4, one is used to make digital signal processor 4 and external communications equipment to keep the electrical isolation circuit 8 of electrical isolation.
Digital signal processor 4 calculates also electrical network parameters such as the phase differential between output voltage, electric current, frequency, voltage and electric current, active power, reactive power, applied power, active energy, reactive energy, digital signal processor 4 communication interfaces are communicated by letter with external communications equipment by electrical isolation circuit 8 and are exported electrical network parameter, and digital signal processor 4 output active energy pulse signals and reactive energy pulse signal are used for the measuring error of verification electrical network parameter simultaneously.Electrical isolation circuit 8 makes digital signal processor 4 and external communications equipment keep electrical isolation.
Claims (10)
1. electrical network parameter intelligence sensor, it is characterized in that, it comprises: a voltage sensor that is used for input voltage is converted into analog voltage signal, a current sensor that is used for input current is converted into analog voltage signal, the analog to digital converter that the analog voltage signal that is used for voltage sensor output is converted into digital voltage signal and the analog voltage signal of current sensor output is converted into the digital current signal, one is used for electrical network parameter was handled and calculated and exported to the digital voltage signal and the digital current signal of analog to digital converter output digital signal processor, through analog to digital converter linking number word signal processor, digital signal processor is provided with the communication interface that is used to export electrical network parameter respectively for voltage sensor and current sensor.
2. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: described digital signal processor is provided with the active energy pulse output end mouth or the reactive energy pulse output end mouth of the measuring error that is used for the verification electrical network parameter.
3. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: described voltage sensor is electric resistance partial pressure type voltage sensor or voltage transformer (VT), and described current sensor is shunt or electromagnetic current transducer or coil type current transformer.
4. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: described current sensor comprises first current sensor and second current sensor that is used for the second road input current is converted into analog voltage signal that are used for first via input current is converted into analog voltage signal, and first current sensor and second current sensor are respectively through analog to digital converter linking number word signal processor.
5. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: described voltage sensor comprises first voltage sensor that is used for A phase input voltage is converted into analog voltage signal, second voltage sensor that is used for B phase input voltage is converted into analog voltage signal with one be used for C mutually input voltage be converted into the tertiary voltage sensor of analog voltage signal, described current sensor comprises first current sensor that is used for A phase input current is converted into analog voltage signal, second current sensor that is used for B phase input current is converted into analog voltage signal with one be used for C mutually input current be converted into the 3rd current sensor of analog voltage signal, described first voltage sensor, second voltage sensor, the tertiary voltage sensor, first current sensor, second current sensor and the 3rd current sensor are respectively through analog to digital converter linking number word signal processor.
6. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: described voltage sensor comprise first voltage sensor that is used for A phase input voltage is converted into analog voltage signal with one be used for C mutually input voltage be converted into second voltage sensor of analog voltage signal, described current sensor comprise first current sensor that is used for A phase input current is converted into analog voltage signal with one be used for C mutually input current be converted into second current sensor of analog voltage signal, described first voltage sensor, second voltage sensor, first current sensor and second current sensor are respectively through analog to digital converter linking number word signal processor.
7. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: it also comprises a storer that is used for the measuring error calibration data of store electricity network parameters, and storer is connected with digital signal processor.
8. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: it also comprises a temperature sensor that is used for the testing environment temperature, and temperature sensor is connected with digital signal processor.
9. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: it also comprises a CT short-circuit detecting circuit that is used to detect front end CT wiring state, the input end of CT short-circuit detecting circuit links to each other with input current, and the output terminal of CT short-circuit detecting circuit is connected with digital signal processor.
10. according to the described electrical network parameter intelligence sensor of claim 1, it is characterized in that: it also comprises one and is used to make digital signal processor and external communications equipment to keep the electrical isolation circuit of electrical isolation, and the electrical isolation circuit is connected with digital signal processor.
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| CN102411103A (en) * | 2011-08-03 | 2012-04-11 | 于利红 | Calibration method for dynamic load mode parameter of direct-current electronic load |
| CN103748475A (en) * | 2011-08-31 | 2014-04-23 | 松下电器产业株式会社 | Electricity meter |
| CN106685991A (en) * | 2017-02-10 | 2017-05-17 | 华立科技股份有限公司 | Full life circle traceable electric energy meter based on wireless technology |
| CN107085934A (en) * | 2017-04-10 | 2017-08-22 | 中国电力科学研究院 | A kind of power information collecting device method for testing performance and system |
| CN111650434A (en) * | 2019-12-26 | 2020-09-11 | 北京博纳电气股份有限公司 | Method for single-phase intelligent electric energy meter to measure by adopting PCB type current sensor |
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Application publication date: 20110420 |