CN103293372B - Electrical quantity sensor, electrical quantity sensor set up unit and voltameter examining system - Google Patents

Electrical quantity sensor, electrical quantity sensor set up unit and voltameter examining system Download PDF

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CN103293372B
CN103293372B CN201310052002.0A CN201310052002A CN103293372B CN 103293372 B CN103293372 B CN 103293372B CN 201310052002 A CN201310052002 A CN 201310052002A CN 103293372 B CN103293372 B CN 103293372B
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unit
electrical quantity
quantity sensor
measurement
voltage
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CN103293372A (en
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福迫雄辅
山本幸义
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Omron Corp
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Omron Corp
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
    • 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
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention provides can utilize as far as possible simple structure to improve the measurement precision of electricity voltameter examining system and for the electrical quantity sensor that formed this voltameter examining system and set up unit.Voltameter examining system (100) has: electrical quantity sensor (1), and the electric current flow to the first measurement object position in alternating circuit (5) and the voltage of alternating circuit (5) measure, and calculate the electricity at the first measurement object position; Set up unit (each electrical quantity sensor (2 ~ 4)), can communicate with electrical quantity sensor (1), the electric current of the second measurement object position flowing in alternating circuit is measured.Electrical quantity sensor (1) sends the synchronizing pulse synchronous with the end points during the measurement with the time span preset to setting up unit repeatedly.Set up unit using the reception of synchronizing pulse as triggering, the electric current in the second measurement object position flowing is measured.

Description

Electrical quantity sensor, electrical quantity sensor set up unit and voltameter examining system
Technical field
The present invention relates to electrical quantity sensor, this electrical quantity sensor set up unit and by electrical quantity sensor and set up the voltameter examining system that unit forms.
Background technology
In recent years, for the purpose of energy-conservation grade, propose the scheme of the detailed management to electricity.Such as, when factory, require to monitor multiple device power consumption separately.
Propose for requiring corresponding coulometry device with this.Such as Japanese Unexamined Patent Publication 2004-85413 publication (patent documentation 1) discloses the multicircuit electric exploration device that can measure the power consumption of multiple load equipment.This determinator has the CT(current transformer arranged for each load equipment), the measuring means that arranges corresponding to each CT and a main unit.Multiple measuring means has power system calculation portion and nonvolatile memory separately.The voltage signal that power system calculation portion provides based on the current signal suitable with the electric current detected by CT and distribution feeder, calculates the power consumption of load equipment.Nonvolatile memory stores the rating blocks of CT.Main unit, based on the rating blocks stored in the nonvolatile memory of each measuring means, sets the ratings of this measuring means.
Japanese Unexamined Patent Publication 2005-55404 publication (patent documentation 2) discloses multicircuit kilowatt meter and it sets up unit.The electric current of main part to the voltage of alternating circuit and measurement point of multicircuit kilowatt meter measures, and exports this voltage measured from connector.Set up unit to be connected with the connector of multicircuit kilowatt meter, receive the voltage that multicircuit kilowatt meter measures.Set up the electric current of unit to other measurement points of alternating circuit to measure, and based on the voltage that this measured electric current and main part measure, calculate electricity.
Patent documentation 1: Japanese Unexamined Patent Publication 2004-85413 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2005-55404 publication
In the multicircuit electric exploration device that patent documentation 1 is recorded, need the circuit for each measurement object that measuring means and CT are set.And then measuring means communicates with main unit separately.Therefore, the order wire with the number of measuring means is needed.Thus according to the structure that patent documentation 1 is recorded, then the quantity that there is the key element for forming voltameter examining system becomes how such problem.
In addition, in order to the easy electricity to multiple measurement position monitors, and often by the voltameter concentrated setting that measures the electricity at each measurement position at 1 position.Multiple voltameter is such as arranged on the inside of a switchboard or a distributor cap.But, according to the structure that patent documentation 1 is recorded, then need the order wire with the number of units equal number of measuring means.Therefore, when the multiple measuring means recorded by patent documentation 1 are arranged on the inside of distributor cap, the inside of distributor cap is likely made to become numerous and diverse.
On the other hand, according to the structure that patent documentation 2 is recorded, then can decide the number of units of setting up unit according to the quantity of measurement object-point.Set up unit to be connected with main part by connector, receive the simulating signal representing voltage data from main part.Set up unit to measure electric current, and calculate electricity based on this measured electric current and the voltage data carrying out main body.The value of setting up the electricity that unit calculates sends to main part via above-mentioned connector.Therefore, according to the structure that patent documentation 2 is recorded, then, compared with the structure recorded with patent documentation 1, the quantity of order wire can be reduced.Its result, owing to can simplify the structure of voltameter examining system, so the cost that can realize voltameter examining system declines.
In patent documentation 2, following explanation utilizes simulating signal to transmit the reason of voltage data.In main part, analog/digital conversion is carried out and output digit signals to magnitude of voltage, and when setting up unit and obtaining magnitude of voltage based on digital signal, at main part and set up in unit signal transacting separately and need the time.Therefore, in main part, measure the moment of voltage and setting up bad student's deviation between the moment measuring electric current in unit.Its result, containing error in the value of calculated electricity.
But, when the structure that patent documentation 2 is recorded, along with the number of units of setting up unit increases, and likely make simulating signal significantly worsen relative to original signal.That is, the transmitting range of the simulating signal carrying out main body the longest set up in unit, likely cannot obtain magnitude of voltage accurately.Therefore, likely set up in the value of the electricity calculated in unit containing error at this.
As mentioned above, by electrical quantity sensor and in setting up voltameter examining system that unit forms, require to utilize simple as far as possible structure to improve the measurement precision of electricity.
Summary of the invention
The object of this invention is to provide and simple as far as possible structure can be utilized to improve the electrical quantity sensor of the voltameter examining system of the measurement precision of electricity and to set up unit for forming.
According to a situation of the present invention, electrical quantity sensor has: the first electric current measurement unit, measures the electric current of the first measurement object position flowing in alternating circuit; Voltage measurement unit, measures the voltage at the first measurement object position; First calculating part, the voltage that the electric current measured based on the first electric current measurement unit and voltage measurement unit measure, calculates the electricity at the first measurement object position.First calculating part exports the synchronizing pulse synchronous with the end points during the measurement with the time span preset repeatedly.Electrical quantity sensor also has: the first connecting portion, for making to set up unit and electrical quantity sensor electrical connection, described in set up unit using the reception of synchronizing pulse as triggering, the electric current flowed in the second measurement object position in alternating circuit is measured; First communication control unit.Synchronizing pulse sends from electrical quantity sensor to setting up unit via the first connecting portion by the first communication control unit.
According to this structure, then the reception of setting up the synchronizing pulse that electrical quantity sensor sends by unit measures as triggering electric current.Synchronizing pulse represents the end points during the measurement of electrical quantity sensor.But, electrical quantity sensor and set up unit and can perform measurement during same measurement.Thereby, it is possible to improve the precision of the electricity calculated by electrical quantity sensor and the measurement of setting up unit.
The time span that " time span preset during measurement " sets before referring to during this measurement.Therefore, in one embodiment, the time span during measurement keeps constant, measures voltage and electric current.In other embodiments, the time span during also can changing measurement, while measure voltage and electric current.
" end points during measurement " also can be the initial point during measurement and any one in terminal.When producing continuously during having the measurement of constant time span, the end points during measurement is terminal during certain measurement and is the initial point during its next measurement.When performing measurement off and on, electrical quantity sensor also by the first synchronizing pulse of the initial point represented during measurement and can represent that the second synchronizing pulse of the terminal during this measurement sends to setting up unit.
" repeatedly export " and refer to the repeatedly output that such as periodically output is such.
The electricity at the second measurement object position can calculate by setting up unit, also can be calculated by electrical quantity sensor.
Preferably, set up unit based on setting up electric current that unit measures and being input to the voltage data set up in unit, the electricity at the second measurement object position is calculated.First calculating part generates the digital signal output digit signals that represent the data of voltage measured during measuring.Digital signal from the first calculating part sends to setting up unit via the first connecting portion by the first communication control unit.
According to this structure, then represent that the digital signal of the voltage that electrical quantity sensor measures sends from electrical quantity sensor to setting up unit.Even if set up unit not measure the voltage at measurement object position, also can calculate the electricity at this measurement object position.Therefore, setting up in unit, the distribution for measuring the voltage of alternating circuit can being omitted.
And then, owing to representing that the data of voltage measured are with the form transmission of digital signal, so electrical quantity sensor can be reduced and set up the radical of the signal wire between unit.Therefore, it is possible to realize the cost degradation of voltameter examining system.
And then voltage data is sent to setting up unit by digital signal.Digital signal has to be compared simulating signal and is difficult to worsen such characteristic.Therefore, owing to sending magnitude of voltage accurately to setting up unit, so the computational accuracy at the electricity setting up unit can be improved.
Preferably, digital signal represents the voltage measured as the period 1 during measuring.First calculating part at output digit signals second round, and in second round based on the voltage measured in the period 1 and electric current, calculates the electricity of period 1.Second round be correspond to immediately measurement after the first period during.
According to this structure, then can suppress the increase of the processing load of the first calculating part.Such as, when set up unit electric current measured in the period 1 and the electricity of period 1 calculated, the digital signal requiring electrical quantity sensor just to generate whenever measuring voltage to represent the voltage measured also sends to setting up unit.Therefore the processing load of the first calculating part is likely increased.According to this structure, electrical quantity sensor immediately second round is after the first period exporting the digital signal representing the voltage measured in the period 1.Set up the data of the data that unit is used in the electric current that the period 1 measures and the voltage represented by digital signal, the electricity of period 1 is calculated.Therefore, it is possible to suppress the increase of the processing load of the first calculating part.
Preferably, during during measurement being the multiple cycles comprising AC wave shape.First calculating part generates reference data and differential data, and reference data and differential data are exported as digital signal, described reference data represents the data of the magnitude of voltage that one-period in cycles measures, described differential data be represent that magnitude of voltage that the remaining cycle in cycles measures is corresponding with reference data magnitude of voltage between the data of difference.
According to this structure, can guarantee from electrical quantity sensor to the precision of setting up the voltage data that unit sends and reduce the size of these data.Because the voltage measured by electrical quantity sensor is alternating voltage, so its constant period.Therefore, think that only magnitude of voltage can change in time.According to said structure, then by being generated as differential data by the variable quantity of magnitude of voltage, thus the precision of voltage data can be guaranteed, and reduce the size of these data.
Preferably, the first communication control unit receives the data relevant to setting up electricity that unit calculates via the first connecting portion from setting up unit.
According to this structure, then electrical quantity sensor can not only have the data of the electricity (i.e. the electricity at the first measurement object position) that this electrical quantity sensor calculates, and can have the data of the electricity (i.e. the electricity at the second measurement object position) set up unit and calculate.
Preferably, the first communication control unit receives the data relevant to setting up electric current that unit measures via the first connecting portion from setting up unit.
According to this structure, then electrical quantity sensor can not only calculate the electricity at the first measurement object position, and can calculate the electricity at the second measurement object position.Therefore, electrical quantity sensor can have the data of the first measurement object position and the second measurement object position electricity separately.
Preferably, electrical quantity sensor also has: signal path, is formed between the first calculating part and the first communication control unit; Signal isolation portion, is arranged on signal path.
Preferably, signal isolation portion comprises isolator.
According to this structure, the electrical isolation with high voltage circuit (such as voltage measurement unit or electric current measurement unit) can be guaranteed, and the communication that can realize electrical quantity sensor and set up between unit.
According to another situation of the present invention, electrical quantity sensor set up unit be can carry out communicating with above-mentioned electrical quantity sensor set up unit.Setting up unit to have: the second connecting portion, setting up unit and electrical quantity sensor electrical connection for making; Second communication control part, receives synchronizing pulse via the second connecting portion from electrical quantity sensor; Second electric current measurement unit, using the synchronizing pulse from second communication control part as triggering, measures the electric current in the second measurement object position flowing.
According to this structure, then the reception of setting up the synchronizing pulse that electrical quantity sensor sends by unit measures as triggering electric current.Synchronizing pulse represents the end points during the measurement of electrical quantity sensor.Therefore, electrical quantity sensor and set up unit and can perform measurement during same measurement.Thereby, it is possible to improve the precision of the electricity calculated by electrical quantity sensor and the measurement of setting up unit.
Preferably, second communication control part receives the digital signal representing the voltage that electrical quantity sensor measures from electrical quantity sensor via the second connecting portion.Set up unit and also there is the second calculating part calculated the electricity at the second measurement object position.The electric current that second calculating part measures based on the second electric current measurement unit and the voltage represented by described digital signal calculate electricity.
According to this structure, the voltage at measurement object position is not measured even if set up unit, also can calculate the electricity at this measurement object position.Therefore, without the need to for by the voltage of alternating circuit to set up unit transmit distribution.And then the data of voltage are transmitted as digital signal, therefore, it is possible to suppress the deterioration of voltage data.Therefore, it is possible to improve the precision of setting up the electricity that unit calculates.And then, because voltage data is transmitted with the form of digital signal, so electrical quantity sensor can be reduced and set up the radical of the signal wire between unit.Therefore, it is possible to form the voltameter examining system that can improve the measurement precision of electricity with low cost.
Preferably, digital signal represents at the voltage measured as the period 1 during measurement.The electric current that second calculating part measures in the period 1 based on the second electric current measurement unit and digital signal, the electricity in second round to the period 1 calculates.During being immediately measurement after the first period second round.
According to this structure, then set up the data that unit can receive the voltage that electrical quantity sensor measured on the opportunity identical with opportunity of measurement of the electric current setting up unit.Therefore, it is possible to guarantee to set up the precision of unit to the calculating of electricity.
Preferably, second communication control part sends the data relevant to the electricity that the second calculating part calculates via the second connecting portion to electrical quantity sensor.
According to this structure, then the electric quantity data generated by the calculating of setting up unit is sent by electrical quantity sensor.Thus, in electrical quantity sensor, the data of the electricity (i.e. the electricity at the first measurement object position) calculated by electrical quantity sensor can not only be had, and can have by the data of setting up the electricity (i.e. the electricity at the second measurement object position) that unit calculates.
Preferably, second communication control part sends the data relevant to the electric current that the second electric current measurement unit measures via the second connecting portion to electrical quantity sensor.
According to this structure, then can calculate the data of the electricity at the second measurement object position in electrical quantity sensor.Therefore, in electrical quantity sensor, the data of the electricity at the first measurement object position that electrical quantity sensor calculates can not only be had, and there are the data of electricity at the second measurement object position.
According to another situation of the present invention, voltameter examining system has: electrical quantity sensor, and the electric current flow to the first measurement object position in alternating circuit and the voltage of alternating circuit measure, and calculate the electricity at the first measurement object position; Set up unit, can communicate with electrical quantity sensor, the electric current of the second measurement object position flowing in alternating circuit is measured.Electrical quantity sensor sends the synchronizing pulse synchronous with the end points during the measurement with the time span preset to setting up unit repeatedly.Set up unit using the reception of synchronizing pulse as triggering, the electric current in the second measurement object position flowing is measured.
According to this structure, the reception of setting up the synchronizing pulse that electrical quantity sensor sends by unit measures as triggering electric current.Synchronizing pulse represents the end points during the measurement of electrical quantity sensor.Therefore, electrical quantity sensor and set up unit and can perform measurement during same measurement.Thereby, it is possible to improve the precision of electricity calculated based on electrical quantity sensor and the measurement of setting up unit.
Preferably, electrical quantity sensor generates the digital signal of the data representing the voltage measured during measuring, and sends digital signal to setting up unit.Set up unit based on setting up the electric current that unit measures and the voltage represented by digital signal, the electricity at the second measurement object position is calculated.
According to this structure, the voltage at the second measurement object position is not measured even if set up unit, also can calculate the electricity at this measurement object position.And then, set up unit, so send voltage data to setting up unit while precision can be guaranteed because the data of voltage are sent to as digital signal.Thereby, it is possible to improve the measurement precision at the electricity setting up unit.And then, because voltage data is transmitted with the form of digital signal, so electrical quantity sensor can be reduced and set up the radical of the signal wire between unit.Therefore, it is possible to form the voltameter examining system that can improve the measurement precision of electricity with low cost.
Preferably, set up unit the data relevant to setting up electric current that unit measures are sent to electrical quantity sensor.Electrical quantity sensor, based on setting up electric current that unit measures and the voltage that electrical quantity sensor measures, calculates the electricity at the second measurement object position.
According to this structure, then in electrical quantity sensor, can calculate the data of the electricity at the second measurement object position.Therefore, in electrical quantity sensor, the data of electricity at the first measurement object position calculated by electrical quantity sensor can not only be had, and the data of electricity at the second measurement object position can be had.
According to the present invention, then can form and simple as far as possible structure can be utilized to improve the voltameter examining system of the measurement precision of electricity.
Accompanying drawing explanation
Fig. 1 is the integrally-built skeleton diagram of the voltameter examining system representing the first embodiment of the present invention.
Fig. 2 is the schematic diagram of the setting example representing the voltameter examining system shown in Fig. 1.
Fig. 3 is the functional block diagram of the structure of the major part of the electrical quantity sensor (master unit (masterunit)) representing the first embodiment of the present invention.
Fig. 4 is the functional block diagram setting up the structure of the major part of unit (slave unit (slaveunit)) representing the first embodiment of the present invention.
Fig. 5 is the precedence diagram of measurement process for illustration of the first embodiment of the present invention and computing.
Fig. 6 is for illustration of the beginning of slave unit to the measurement of electric current and the oscillogram of end.
Fig. 7 is the oscillogram for illustration of the data compression undertaken by master unit.
Fig. 8 is the figure of the structure for illustration of the voltage data sent from master unit to slave unit.
Fig. 9 represents the electrical quantity sensor of the first embodiment of the present invention and sets up the figure of structure example of the connecting portion that unit has.
Figure 10 is the figure of the structure example of the bus of the comparative example representing the first embodiment.
Figure 11 is the precedence diagram of measurement process for illustration of embodiments of the present invention 2 and computing.
Wherein, description of reference numerals is as follows:
1 ~ 4, 41, 42 electrical quantity sensors, 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b current transformer, 5 alternating circuits, 5a ~ 5c line of electric force, 6a ~ 6d load device, 7 data processing equipments, 8 distributor caps, 9 guide rails, 10, 40 telecommunication cables, 10a ~ 10c, 40a ~ 40d order wire, 11 voltage measurement unit, 11a bleeder circuit, 11b, 12b, 22bA/D translation circuit, 12, 22 electric current measurement unit, 12a, 22a current/voltage translation circuit, 13, 23 communication control units, 14, 24, 14a, 24a connecting portion, 15, 25 signal paths, 15a, 25a isolator, 18, 28 counting circuits, 19, 29 storage parts, 30 AC wave shape, 100 voltameter examining systems
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described in detail.In addition, identical Reference numeral is marked to part same or equivalent in figure, and does not repeat its explanation.
[embodiment 1]
Fig. 1 is the integrally-built skeleton diagram of the voltameter examining system representing the first embodiment of the present invention.With reference to Fig. 1, voltameter examining system 100 has electrical quantity sensor 1 ~ 4.Electrical quantity sensor 1 corresponds to " electrical quantity sensor " of the present invention.Electrical quantity sensor 2 ~ 4 corresponds respectively to " the setting up unit of electrical quantity sensor " of the present invention.
Alternating circuit 5 comprises line of electric force 5a, 5b, 5c.Alternating circuit 5 provides alternating electromotive force to each load device 6a ~ 6d.Each load device 6a ~ 6d is such as device in factory or equipment.
In FIG, as an example of the distribution system of alternating circuit 5, three-phase 3 line formula is shown.The distribution system of alternating circuit 5 is not limited to three-phase 3 line formula, also can be such as single-phase 2 line formulas, single-phase 3 line formulas or three-phase 4 line formula.
The electric current at the voltage of electrical quantity sensor 1 pair of alternating circuit 5 and the first measurement object position measures.First measurement object position corresponds to the part transmitting alternating electromotive force between alternating circuit 5 and load device 6a.Therefore, the first measurement object position is not limited to 1 point.Specifically, electrical quantity sensor 1 is connected with line of electric force 5a, 5b, 5c, measures the voltage of alternating circuit 5.Further, current transformer 1a, 1b is connected with electrical quantity sensor 1.Current transformer 1a, 1b detect the electric current flowed at line of electric force 5a, 5b respectively.The signal that electrical quantity sensor 1 utilizes current transformer 1a, 1b to export, measures the electric current at the first measurement object position.
Electrical quantity sensor 2 ~ 4 measures the electric current at the second measurement object position respectively.Second measurement object position corresponds in alternating circuit 5 and each part transmitting alternating electromotive force between load device 6b, 6c, 6d.Identical with electrical quantity sensor 1, each electrical quantity sensor 2 ~ 4 is connected with two current transformers (2a, 2b, 3a, 3b, 4a, 4b) respectively.The signal that each electrical quantity sensor 2 ~ 4 utilizes two current transformers be connected with this electrical quantity sensor to export respectively, measures the electric current at the second measurement object position.
Electrical quantity sensor 1 can communicate with between each electrical quantity sensor 2 ~ 4.Electrical quantity sensor 1 exports the synchronizing pulse synchronous with the end points during the measurement with the time span preset repeatedly.Such as, synchronizing pulse exported from electrical quantity sensor 1 repeatedly with the constant time interval.But the time interval of the output of synchronizing pulse is not limited to the interval be fixed, such as, can change with the same step of the frequency of system.Or the time interval of the output of synchronizing pulse also can such as change based on source power supply.The reception of this synchronizing pulse as triggering, measures the electric current in the second measurement object position flowing by each electrical quantity sensor 2 ~ 4.
In this embodiment, electrical quantity sensor 1 also will represent that the digital signal of the voltage that electrical quantity sensor 1 measures sends to each electrical quantity sensor 2 ~ 4.Electrical quantity sensor 1, based on measured voltage and the electric current that measures, calculates the electricity at the first measurement object position.Each electrical quantity sensor 2 ~ 4, based on the data of measured electric current and the voltage data that represented by the digital signal from electrical quantity sensor 1, calculates electricity.
The power consumption of load device is not limited to by calculating the electricity obtained.Such as at load device, there is motor, and when this motor carries out regeneration actions, also can obtain the generating electricity of motor.
In this embodiment, the data by calculating the electricity obtained send as digital signal to electrical quantity sensor 1 by each electrical quantity sensor 2 ~ 4.Therefore, electrical quantity sensor 1 keeps the data of the electricity obtained by each electrical quantity sensor 1 ~ 4.The data of the electricity obtained by each electrical quantity sensor 1 ~ 4 send to data processing equipment 7 by electrical quantity sensor 1.Data processing equipment 7 is realized by the personal computer performing such as regulated procedure.
Electrical quantity sensor 1 via such as not shown communicator and order wire to data processing equipment 7 transfer of data.But electrical quantity sensor 1 can at the recording medium identifying recording layer as storage card.Be inserted in data processing equipment 7 after this recording medium is taken out from electrical quantity sensor 1.Data processing equipment 7 reads the electric quantity data stored in the recording medium.Even if profit is in this way, also can from electrical quantity sensor 1 to data processing equipment 7 transfer of data.
The supply voltage of electrical quantity sensor 1 ~ 4 can separately be provided.Therefore, electrical quantity sensor 1 ~ 4 can be connected with power supply respectively.Or, also can adopt the structure that supply voltage is provided respectively from electrical quantity sensor 1 to electrical quantity sensor 2 ~ 4.
Fig. 2 is the schematic diagram of the setting example representing the voltameter examining system shown in Fig. 1.With reference to Fig. 2, electrical quantity sensor 1 ~ 4 is arranged on the inside of such as distributor cap 8.As shown in Figure 2, guide rail 9(such as DIN guide rail is provided with in the inside of distributor cap 8).Electrical quantity sensor 1 ~ 4 is installed on the rail 9 respectively.Electrical quantity sensor 1 communicates via telecommunication cable 10 with each electrical quantity sensor 2 ~ 4.In one embodiment, the communication mode between electrical quantity sensor is that serial is passed through.
As mentioned above, the calculating of electrical quantity sensor 1 to the electricity of each electrical quantity sensor 2 ~ 4 controls.That is, in voltameter examining system 100, electrical quantity sensor 1 plays function as master unit, and each electrical quantity sensor 2 ~ 4 plays function as slave unit.Structure according to Fig. 1 and Fig. 2, the quantity of slave unit is 3, but is not limited to this.The quantity of slave unit can be increased and decreased according to the quantity at measurement object position.
Fig. 3 is the functional block diagram of the structure of the major part of the electrical quantity sensor (master unit) representing the first embodiment of the present invention.With reference to Fig. 3, electrical quantity sensor 1 comprises voltage measurement unit 11, electric current measurement unit 12, counting circuit 18, communication control unit 13, connecting portion 14, the signal path 15 comprising isolator (isolator) 15a, storage part 19.
Voltage measurement unit 11 comprises bleeder circuit 11a and A/D translation circuit 11b.Electric current measurement unit 12 comprises current transformer 1a, 1b, current/voltage translation circuit 12a and A/D translation circuit 12b.A/D translation circuit 11b, 12b also can be integrated in a circuit.Or A/D translation circuit 11b, 12b and counting circuit 18 also can be integrated in a treating apparatus (such as CPU).In addition, communication control unit 13 also can be realized by such as CPU.
Voltage measurement unit 11 couples of line of electric force 5a, 5b, 5c voltage Va, Vb, Vc separately measure.Bleeder circuit 11a carries out dividing potential drop to input voltage (voltage Va, Vb, Vc), generates the voltage being suitable for the intensity measured.A/D translation circuit 11b performs sampling and A/D conversion to the voltage that bleeder circuit 11a exports.Thus, the numerical data representing voltage Va, Vb, Vc value is separately generated.Voltage measurement unit 11 realizes " the voltage measurement unit " that " electrical quantity sensor " of the present invention has.
Electric current measurement unit 12 couples of line of electric force 5a, 5b electric current I 1 separately, I3 measure.Current transformer 1a exports the electric current I 1a proportional with electric current I 1.Current transformer 1b exports the electric current I 3a proportional with electric current I 3.Electric current I 1a, I3a are transformed to voltage by current/voltage translation circuit 12a, also amplify this voltage.Thus, current/voltage translation circuit 12a generates the voltage being suitable for the intensity measured.A/D translation circuit 12b performs sampling and A/D conversion to the voltage that current/voltage translation circuit 12a exports.Thus, the numerical data representing electric current I 1, I3 value is separately generated.Electric current measurement unit 12 realizes " the first electric current measurement unit " that " electrical quantity sensor " of the present invention has.
Counting circuit 18, based on from the expression electric current I 1 of electric current measurement unit 12, the numerical data of I3 value separately, generates the numerical data of the value representing the electric current I 2 flowed at line of electric force 5c.Due to electric current I 1, I2, I3 add up to 0, so based on electric current I 1, I3 value and the value of electric current I 2 can be calculated.The numerical data of voltage Va, Vb, Vc that counting circuit 18 uses voltage measurement unit 11 to export and the numerical data of electric current I 1 ~ I3, calculate the electricity at the first measurement object position.Counting circuit 18 makes the electric quantity data as result of calculation be stored in storage part 19.Counting circuit 18 realizes " the first calculating part " that " electrical quantity sensor " of the present invention has.
Counting circuit 18 generates the synchronizing pulse on opportunity (timing) of beginning of measurement representing voltage Va, Vb, Vc and electric current I 1, I2, I3.Counting circuit 18 exports this synchronizing pulse.
Counting circuit 18 also uses the numerical data of voltage Va, Vb, Vc to generate digital signal, and exports this digital signal.
Signal path 15 is arranged between counting circuit 18 and communication control unit 13.Isolator 15a is provided with in the way of signal path 15.Isolator 15a makes counting circuit 18 and communication control unit 13 insulate.When the magnitude of voltage of alternating circuit 5 and current value high, voltage measurement unit 11 and electric current measurement unit 12 can become high voltage circuit.Electrical isolation in order to ensure opposing high voltage potentials portion also can carry out the communication of digital signal between electrical quantity sensor 1 and electrical quantity sensor 2, and is provided with the isolator 15a as signal isolation portion.Isolator 15a is such as the digital isolator of capacitor type.But signal isolation portion also can be realized by such as photo-coupler.
Synchronizing pulse and digital signal (voltage data) send to communication control unit 13 via signal path 15 by counting circuit 18.Communication control unit 13 exports from the digital signal of counting circuit 18 and synchronizing pulse to connecting portion 14.When communication control unit 13 receives digital signal (electric quantity data) from slave unit, this digital signal sends to counting circuit 18 via signal path 15 by communication control unit 13.Now, the electric quantity data that slave unit sends by counting circuit 18 is stored in storage part 19.Such as, communication control unit 13 pairs of data transmission and receive based on UART(UniversalAsynchronousReceiverTransmitter: UART Universal Asynchronous Receiver Transmitter) communication.Communication control unit 13 realizes " the first communication control unit " that " electrical quantity sensor " of the present invention has.
Connecting portion 14 is electrically connected with electrical quantity sensor 2 via telecommunication cable 10.Synchronizing pulse and digital signal (voltage data) export from connecting portion 14 to telecommunication cable 10, and are input to the connecting portion 24 of electrical quantity sensor 2 via telecommunication cable 10.On the other hand, the digital signal (electric quantity data) sent from the connecting portion 24 of electrical quantity sensor 2 inputs via the connecting portion 14 of telecommunication cable 10 to electrical quantity sensor 1.Connecting portion 14 is such as made up of bus and bonder terminal.Connecting portion 14 realizes " the first connecting portion " that " electrical quantity sensor " of the present invention has.
Storage part 19 can be written into data, and stores the data write in nonvolatile manner.Known nonvolatile semiconductor memory can be used as storage part 19.
Fig. 4 is the functional block diagram setting up the structure of the major part of unit (slave unit) representing the first embodiment of the present invention.The structure of electrical quantity sensor 2 ~ 4 is mutually the same.Therefore, in the diagram, the structure of electrical quantity sensor 2 is representatively shown.
With reference to Fig. 4, the structure of electrical quantity sensor 2 and the structure difference of electrical quantity sensor 1 are, do not comprise voltage measurement unit, and the structure of other parts are substantially the same with the structure of electrical quantity sensor 1.Specifically, electrical quantity sensor 2 comprises electric current measurement unit 22, counting circuit 28, communication control unit 23, connecting portion 24, the signal path 25 comprising isolator 25a, storage part 29.
Electric current measurement unit 22 comprises current transformer 2a, 2b, current/voltage translation circuit 22a and A/D translation circuit 22b.A/D translation circuit 22b and counting circuit 28 can be integrated in a treating apparatus (such as CPU).In addition, communication control unit 23 also can be realized by such as CPU.
Electric current measurement unit 22 couples of line of electric force 5a, 5b electric current I 4 separately, I6 measure.Current transformer 2a exports the electric current I 4a proportional with electric current I 4.Current transformer 2b exports the electric current I 6a proportional with electric current I 6.Electric current I 4a, I6a are transformed to voltage by current/voltage translation circuit 22a, also amplify this voltage.Thus, current/voltage translation circuit 22a generates the voltage being suitable for the intensity measured.A/D translation circuit 22b performs sampling and A/D conversion to the voltage that current/voltage translation circuit 22a exports.Thus, the numerical data representing electric current I 4, I6 value is separately generated.Electric current measurement unit 22 realizes " the second electric current measurement unit " that " the setting up unit of electrical quantity sensor " of the present invention has.
Counting circuit 28, based on the numerical data representing electric current I 4, I6 value separately, generates the numerical data of the value representing the electric current I 5 flowed at line of electric force 5c.Represent that the generation method of the numerical data of the value of electric current I 5 is identical with the generation method of the numerical data of the value of expression electric current I 2.
Counting circuit 28 receives the digital signal of the value of synchronizing pulse and expression voltage Va, Vb, Vc.The reception of this synchronizing pulse is started sampling and A/D conversion as triggering by A/D translation circuit 22b.The value of voltage Va, Vb, Vc that counting circuit 28 is used the value of electric current I 4 ~ I6 and obtained by received digital signal, calculates the electricity at the second measurement object position.Electric quantity data as result of calculation is stored in storage part 29 by counting circuit 28.Counting circuit 28 realizes " the second calculating part " that " the setting up unit of electrical quantity sensor " of the present invention has.
Signal path 25 is arranged between counting circuit 28 and communication control unit 23.Isolator 25a is provided with in the way of signal path 25.Identical with isolator 15a, isolator 25a is the signal isolation portion that counting circuit 28 and communication control unit 23 are insulated.Isolator 25a is such as the digital isolator of capacitor type.But can rise and replace isolator 25a, such as, be realized by photo-coupler.
Communication control unit 23 receives from electrical quantity sensor 1(master unit via connecting portion 24) synchronizing pulse and digital signal (voltage data).In this case, this synchronizing pulse and digital signal send to counting circuit 28 via signal path 25 by communication control unit 23.On the other hand, the digital signal that expression second measures the electricity at object position exports to communication control unit 23 via signal path 25 by counting circuit 28.In this case, this digital signal exports to connecting portion 24 by communication control unit 23.Transmission and the reception of communication control unit 23 pairs of data communicate based on UART.Communication control unit 23 realizes " the second communication control part " that " the setting up unit of electrical quantity sensor " of the present invention has.
Connecting portion 24 is electrically connected with electrical quantity sensor 1 via telecommunication cable 10.Synchronizing pulse and digital signal (voltage data) input from telecommunication cable 10 to connecting portion 24, then send to communication control unit 23.On the other hand, the digital signal (electric quantity data) that communication control unit 23 sends inputs from connecting portion 24 via the connecting portion 14 of telecommunication cable 10 to electrical quantity sensor 1.Connecting portion 24 is such as made up of bus and bonder terminal.Connecting portion 24 realizes " the second connecting portion " that " the setting up unit of electrical quantity sensor " of the present invention has.
Storage part 29 can be written into data, and stores the data write in nonvolatile manner.Known nonvolatile semiconductor memory can be used as storage part 29.
As shown in Figure 4, owing to not measuring voltage in electrical quantity sensor 2, so eliminate for by electrical quantity sensor 2(slave unit) distribution that is connected with each line of electric force 5a, 5b, 5c.Therefore, according to this embodiment, the quantity of the distribution used in voltameter examining system can be reduced.Particularly, when the quantity of slave unit is many, the effect can saving the radical of distribution becomes remarkable.
As mentioned above, in this embodiment, mutually electric current and voltage are measured to each of three-phase alternating current.But, following, with to the electric current of 1 phase in three-phase and the measurement of voltage for representative is described.The electric current of remaining 2 phases and the measurement of voltage are also undertaken by the method identical with the measuring method of following explanation.
Fig. 5 is the precedence diagram of measurement process for illustration of the first embodiment of the present invention and computing.With reference to Fig. 5, measurement period T0, T1, T2, T3 have the time span preset.In this embodiment, the time span of measurement period T0 ~ T3 is constant.
At moment t1, synchronizing pulse sends to slave unit (electrical quantity sensor 2 representatively) by master unit (electrical quantity sensor 1).Thus, measurement period T0 terminates and measures period T1 to start.Master unit also sends at the voltage data measuring period T0 acquisition to slave unit as digital signal.
At moment t1, master unit starts the measurement to voltage and electric current.Thus, voltage data and the current data of measurement period T1 is obtained.Master unit also based on measuring voltage data and the current data of period T0 acquisition, calculates the electricity of measurement period T0.
Slave unit by receiving synchronizing pulse at moment t1, thus holds the end of measurement period T0 and the beginning of measurement period T1.Slave unit starts the measurement to electric current at moment t1.Thus, slave unit obtains the current data of measurement period T1.
The data of the electricity of (not shown in Figure 5) during measurement before measurement period T0 send as digital signal to master unit by slave unit.And then slave unit, based on the voltage data of the measurement period T0 sent in the current data and master unit that measure period T0 acquisition, calculates the electricity of measurement period T0.
Measurement period T2, T3 perform the process same with the process in measurement period T0, T1.At moment t2, synchronizing pulse sends to slave unit by master unit.Thus, measurement period T1 terminates and measures period T2 to start.Master unit also sends at the voltage data measuring period T1 acquisition to slave unit as digital signal.Measuring period T2, master unit measures voltage and electric current.And then master unit, based on measuring voltage data and the current data of period T1 acquisition, calculates the electricity of measurement period T1.
Measuring in period T2, the data of the electricity of measurement period T0 send as digital signal to master unit by slave unit.And then slave unit measures electric current.And then measuring in period T2, slave unit, based on the voltage data of the measurement period T1 sent in the current data and master unit that measure period T1 acquisition, calculates the electricity of measurement period T1.
At moment t3, synchronizing pulse sends to slave unit by master unit.Thus, measurement period T2 terminates and measures period T3 to start.Master unit also sends at the voltage data measuring period T2 acquisition to slave unit as digital signal.Measuring period T3, master unit measures voltage and electric current.And then master unit, based on measuring voltage data and the current data of period T2 acquisition, calculates the electricity of measurement period T2.
Measuring period T3, the data of the electricity of measurement period T1 send as digital signal to master unit by slave unit.And then slave unit measures electric current.And then measuring in period T3, slave unit, based on the voltage data of the measurement period T2 sent in the current data and master unit that measure period T2 acquisition, calculates the electricity of measurement period T2.
Process shown in Fig. 5 is described as follows.The counting circuit 18 of electrical quantity sensor 1 at output digit signals second round, and based on the voltage measured in the period 1 and electric current, calculates the electricity of period 1.Equally, the counting circuit 28 of electrical quantity sensor 2 is based on the electric current measured in the period 1 by electric current measurement unit 22 and the digital signal from electrical quantity sensor 1, and the electricity in second round to the period 1 calculates." second round " corresponds to immediately preceding during the measurement after " period 1 ".That is, if the period 1 is measurement period T0, then measurement period T1 is corresponded to second round.If the period 1 is measurement period T1, then correspond to measurement period T2 second round.
In order to calculate electricity exactly, desired voltage values obtains on identical opportunity with current value.In order to compare with embodiments of the present invention, assuming that the electricity during certain measurement is calculated during this measurement.In this case, in order to slave unit obtains voltage data and current data on identical opportunity, need in slave unit and master unit, make the opportunity of sampling synchronous.And then the opportunity that the opportunity of master unit acquisition voltage data and slave unit receive this voltage data is necessary consistent.But, because voltage data is sent to slave unit by from master unit, so be later than the opportunity that master unit obtains voltage data the opportunity of slave unit receiver voltage data.
According to present embodiment, then the electricity of period 1 was calculated in second round.Therefore, the voltage data that slave unit can obtain based on the identical opportunity in the period 1 and current data, calculate the electricity of period 1.Thereby, it is possible to guarantee the computational accuracy of electricity.
And then master unit and the electricity of slave unit on identical opportunity (such as measuring period T2) to the same period (such as measuring period T1) at multiple measurement object position calculate.Therefore, when master unit gets electric quantity data from slave unit, the electric quantity data that master unit calculates and the electric quantity data that slave unit calculates easily are associated.Such as, the management of electrical quantity sensor 1 pair of electric quantity data is easily realized.Thereby, it is possible to expect such as to write the process of data to storage part 19 and read the high speed of process of data from storage part 19.
And then the voltage data obtained in the period 1 sends to slave unit in second round by master unit in the lump.Therefore, master unit there is no need just these data to be sent to slave unit whenever obtaining voltage data.Thereby, it is possible to suppress the increase of the processing load of master unit (counting circuit 18).
Fig. 6 is for illustration of the beginning of slave unit to the measurement of electric current and the oscillogram of end.With reference to Fig. 6, during comprising 5 cycles corresponding to AC wave shape during the measurement set by master unit and between validation period.It is start time in order to measure at the chien shih of master unit and slave unit synchronous and setting between validation period.Length between validation period can consider the difference of processing speed (such as clock frequency) such as between master unit and slave unit, the number of units etc. of slave unit suitably sets.
When slave unit receives synchronizing pulse, slave unit carries out the measurement of electric current from the time of reception point of this pulse.The electric current of slave unit to 5 of AC wave shape 30 cycles measures, and then temporarily stops measurement, until receive next synchronous pulse.When next slave unit receives synchronizing pulse, slave unit starts the measurement carrying out electric current again.
Master unit, by sampling and A/D conversion, generates the voltage data in 5 cycles of AC wave shape.As mentioned above, master unit utilizes digital signal to be sent to slave unit by this voltage data.Position (bit) number of A/D conversion is higher, and the precision of data is higher.But the size to the data of slave unit transmission becomes large.
When the size of data becomes large, call duration time is elongated.Time elongated when in communication, likely the process of at least one in such as master unit and slave unit is impacted.On the other hand, by reducing the figure place of sampling frequency or reduction A/D conversion, the size of data can be reduced.But, in this case, the precise decreasing of data.
In order to address these problems, in this embodiment, master unit compresses voltage data, and is sent to slave unit by this packed data.And then master unit performs the compression method being used for the precision guaranteeing magnitude of voltage as far as possible.
Fig. 7 is the oscillogram for illustration of the data compression undertaken by master unit.Fig. 8 is the figure of the structure of the voltage data sent to slave unit for illustration of master unit.In addition, in the figure 7, the voltage waveform of 1 phase is shown.With reference to Fig. 7 and Fig. 8, the number of samples in 1 cycle exchanged is set to n.Magnitude of voltage V 11, V 12... V 1nit is the value representing the magnitude of voltage in period 1 measurement by digital value (A/D value).Such as, magnitude of voltage V 11represent the magnitude of voltage obtained at first sample time of period 1.N is such as 64.
Master unit (counting circuit 18) directly preserves the magnitude of voltage obtained by the measurement of period 1.Magnitude of voltage V 11, V 12... V 1nreference data is set as in process described later.
Master unit (counting circuit 18) generate represent second round ~ magnitude of voltage that measures respectively of the period 5 magnitude of voltage corresponding with reference data between the differential data of difference value.In addition, as shown in Figure 7, period 1 ~ period 5 in any one cycle in, sample time is identical.Such as, difference value Δ V 21the magnitude of voltage and magnitude of voltage V that obtain first of second round sampling moment 11between difference value.Measurement value in the measurement of second round is expressed as differential data Δ V 21, Δ V 22... Δ V 2n.Below, equally, period 3 ~ period 5 in generate differential data respectively.
Because the voltage measured by master unit is alternating voltage, this constant period.Therefore, think that only magnitude of voltage likely changes in time.In this embodiment, using second round ~ period 5 magnitude of voltage separately generates as the difference of the corresponding magnitude of voltage with the period 1.Thereby, it is possible to guarantee second round ~ precision of period 5 magnitude of voltage separately, and make size of data be less than the size of reference data.Such as reference data is the data of 12, and differential data is the data of 8.
According to this embodiment, then the data transmitted between master unit and slave unit are numerical datas.Thereby, it is possible to reduce the quantity of master unit and slave unit signal path separately.This point is described.
Fig. 9 represents the electrical quantity sensor of the first embodiment of the present invention and sets up the figure of structure example of the connecting portion that unit has.With reference to Fig. 9, the structure of connecting portion 14,24 is mutually the same.Connecting portion 14,24 comprises pulse signal terminals P x separately, sends terminal Tx, receiving terminal Rx.Receiving terminal Rx is for the signal terminal from external reception digital signal.Transmission terminal Tx is the terminal for externally sending digital signal.These terminals are connected with not shown bus.
Telecommunication cable 10 comprises order wire 10a, 10b, 10c.Order wire 10a makes the pulse signal terminals P x of connecting portion 14,24 be connected to each other.Order wire 10b makes the transmission terminal Tx of connecting portion 14 be connected with the receiving terminal Rx of connecting portion 24.Order wire 10c makes the receiving terminal Rx of connecting portion 14 be connected with the transmission terminal Tx of connecting portion 24.The synchronizing pulse exported from the pulse signal terminals P x of connecting portion 14 inputs to the pulse signal terminals P x of connecting portion 24 via order wire 10a.The voltage data (digital signal) exported from the transmission terminal Tx of connecting portion 14 inputs to the receiving terminal Rx of connecting portion 24 via order wire 10b.The digital signal, the i.e. electric quantity data that export from the transmission terminal Tx of connecting portion 24 input to the receiving terminal Rx of connecting portion 14 via order wire 10c.
Figure 10 is the figure of the structure example of the bus of the comparative example representing the first embodiment.With reference to Figure 10, electrical quantity sensor 41,42 has connecting portion 14a, 24a respectively.Connecting portion 14a comprises pulse signal terminals P x, sends terminal Tx1, Tx2, receiving terminal Rx.Connecting portion 24a comprises pulse signal terminals P x, sends terminal Tx, receiving terminal Rx1, Rx2.
Transmission terminal Tx1, Tx2 and receiving terminal Rx1, Rx2 are the terminals for transmitting simulating signal.The function of pulse signal terminals P x, transmission terminal Tx and receiving terminal Rx is identical with above-mentioned function.
Telecommunication cable 40 comprises order wire 40a, 40b, 40c, 40d.Order wire 40a makes the pulse signal terminals P x of connecting portion 14a, 24a be connected to each other.Order wire 40b makes the transmission terminal Tx1 of connecting portion 14a be connected with the receiving terminal Rx1 of connecting portion 24a.Order wire 40c makes the transmission terminal Tx2 of connecting portion 14a be connected with the receiving terminal Rx2 of connecting portion 24a.Order wire 40d makes the receiving terminal Rx of connecting portion 14a be connected with the transmission terminal Tx of connecting portion 24a.
Electrical quantity sensor 41 exports the simulating signal of the data representing relevant to the absolute value of voltage respectively from sending terminal Tx1, Tx2 and represents the simulating signal of symbol of this voltage.These signals input respectively to receiving terminal Rx1, the Rx2 of connecting portion 24a via order wire 40b, 40c.On the other hand, electrical quantity sensor 42 exports from sending terminal Tx the digital signal representing electric quantity data.This digital signal inputs to the receiving terminal Rx of connecting portion 14a via order wire 40d.
According to the structure shown in Figure 10, compared with the structure shown in Fig. 9, the radical of required signal wire becomes many.This is because transmit both simulating signal and digital signal.If utilize shown in the contrast of Fig. 9 and Figure 10 such, if utilize this embodiment, then the radical of signal wire can be reduced.Thereby, it is possible to suppress the cost of voltameter examining system.
As mentioned above, according to the first embodiment, the radical of distribution and the order wire measured for voltage can be reduced, and the computational accuracy of electricity can be guaranteed.Therefore, according to the first embodiment, then can form and simple as far as possible structure can be utilized to improve the voltameter examining system of the measurement precision of electricity.
[embodiment 2]
The one-piece construction of the voltameter examining system of embodiment 2 is same with the structure shown in Fig. 1.And then the structure of master unit and slave unit is identical respectively with the structure shown in Fig. 3 and Fig. 4.
In embodiment 2, master unit (electrical quantity sensor 1) receives the data relevant to the electric current measured by each slave unit (each electrical quantity sensor 2 ~ 4) from slave unit.Further, the electric current that master unit measures based on slave unit and the voltage that master unit measures, calculate the electricity at the second measurement object position.
With reference to Fig. 3 and Fig. 4, the master unit of embodiment 2 and the action of slave unit are described.At electrical quantity sensor 2(slave unit) in, counting circuit 28 will represent that the digital signal of the electric current that electric current measurement unit 22 measures exports to communication control unit 23.Communication control unit 23 via connecting portion 24 and telecommunication cable 10 by this digital signal to electrical quantity sensor 1(master unit) send.
In electrical quantity sensor 1, communication control unit 13 receives the digital signal of the data representing relevant to the electric current that electrical quantity sensor 2 measures via connecting portion 14.The voltage that counting circuit 18 measures based on voltage measurement unit 11 and the electric current represented by the digital signal from electrical quantity sensor 2, calculate the electricity at the second measurement object position.
Figure 11 is the precedence diagram of measurement process for illustration of embodiments of the present invention 2 and computing.With reference to Figure 11, same during measurement period T0, T1, the measurement shown in T2, T3 and Fig. 5, there is constant time span.
In embodiment 2, synchronizing pulse only sends to slave unit (electrical quantity sensor 2 representatively) by master unit (electrical quantity sensor 1).The data of electric current send to master unit by slave unit.The voltage that master unit measures based on master unit and the electricity of electric current to the first measurement object position (master side) calculate.And then the voltage that master unit measures based on master unit and the current data that slave unit sends, calculate the electricity of the second measurement object position (slave unit side).At that point, the measurement process of the measurement process of embodiment 2 and computing and embodiment 1 and computing different.
The digital signal of the electric current represented in period 1 measurement sends to electrical quantity sensor 1 in second round by electrical quantity sensor 2.The counting circuit 18 of electrical quantity sensor 1, calculated the electricity of period 1 based on the voltage measured in the period 1 and electric current in second round.Therefore, electrical quantity sensor 1, based on the voltage data obtained the identical opportunity in the period 1 and current data, calculates the electricity of the period 1 of electrical quantity sensor 2." second round " corresponds to immediately preceding during the measurement after " period 1 ".This point is identical with embodiment 1.
As previously discussed, according to the second embodiment, then same with the first embodiment, the radical of distribution and the order wire measured for voltage can be reduced, and the computational accuracy of electricity can be guaranteed.Therefore, according to the second embodiment, then can form and simple as far as possible structure can be utilized to improve the voltameter examining system of the measurement precision of electricity.
In addition, in the respective embodiments described above, during deciding measurement by the time interval of synchronizing pulse.Therefore, the length during measurement is not limited to constant (5 cycles of such as AC wave shape), and the length during measurement can suitably change.Synchronous with the beginning of the measurement of master unit, synchronizing pulse sends to slave unit by master unit.Thus, even if the length variations during measurement, also can be synchronous in the beginning of the chien shih measurement of master unit and slave unit.
In addition, in above-mentioned each embodiment, measurement is performed continuously.Therefore, synchronizing pulse represents the terminal during certain measurement and the initial point during next measurement.But, also can perform measurement off and on.In this case, such as, the second synchronizing pulse of the first synchronizing pulse of the initial point represented during measurement and the terminal represented during this measurement can send to slave unit by master unit.After slave unit receives the second synchronizing pulse, correspond to during between to next first synchronizing pulse of reception during not carrying out measuring.
In addition, in above-mentioned each embodiment, as 1 example of serial communication, show UART communication.But, also can by USB(UniversalSerialBus: USB (universal serial bus)) communication, CAN(ControllerAreaNetwork: controller local area network) serial communication that communicates other modes such is applied to communication between master unit and slave unit.
In addition, in the respective embodiments described above, master unit sends synchronizing pulse every the cycle (such as 5 cycles) of the regulation of AC wave shape.But master unit also can send synchronizing pulse every 1 cycle.The voltage data sent from master unit to slave unit can be compressed by above-mentioned method.Such as, master unit generates reference data and sends to slave unit in the period 1.In the second cycle, master unit generation differential data sends to slave unit.Reference data generated every multiple cycles of regulation.
Should be appreciated that, embodiment of disclosure be all in all respects illustrate instead of restrictive.Scope of the present invention is not by the explanation of above-mentioned embodiment but is illustrated by claims, certainly comprises the meaning that is equal to claim and all changes in scope.

Claims (16)

1. an electrical quantity sensor, is characterized in that,
Have:
First electric current measurement unit, measures the electric current of the first measurement object position flowing in alternating circuit,
Voltage measurement unit, measures the voltage at described first measurement object position,
First calculating part, the voltage that the electric current measured based on described first electric current measurement unit and described voltage measurement unit measure, calculates the electricity at described first measurement object position;
Described first calculating part repeatedly export with the measurement with the time span preset during the synchronizing pulse of initial point synchronised,
Described electrical quantity sensor also has:
First connecting portion, is electrically connected with described electrical quantity sensor for making to set up unit, described in set up unit using the reception of described synchronizing pulse as triggering, to described alternating circuit second measurement object position flowing electric current measure,
First communication control unit, sends described synchronizing pulse from described electrical quantity sensor to described unit of setting up via described first connecting portion.
2. electrical quantity sensor as claimed in claim 1, is characterized in that,
Described set up unit based on described set up electric current that unit measures and be input to described in set up the voltage data of unit, the electricity at described second measurement object position is calculated,
Described first calculating part generates the digital signal of the data for representing the voltage measured during described measurement and exports described digital signal,
Described digital signal from described first calculating part sends to described unit of setting up via described first connecting portion by described first communication control unit.
3. electrical quantity sensor as claimed in claim 2, is characterized in that,
Described digital signal represents at the voltage measured as the period 1 during described measurement,
Described first calculating part exports described digital signal in second round, and in second round based on the voltage measured in the described period 1 and electric current, calculates the electricity of described period 1,
Described second round corresponds to immediately preceding during the described measurement after the described period 1.
4. electrical quantity sensor as claimed in claim 2, is characterized in that,
During being the multiple cycles comprising AC wave shape during described measurement,
Described first calculating part generates reference data and differential data, and described reference data and described differential data are exported as described digital signal, described reference data is the data representing the magnitude of voltage that the one-period in described multiple cycle measures, described differential data be represent that magnitude of voltage that the remaining cycle in described multiple cycle measures is corresponding with described reference data magnitude of voltage between the data of difference.
5. electrical quantity sensor as claimed in claim 2, is characterized in that,
Described first communication control unit receives via described first connecting portion and sets up the relevant data of electricity that unit calculates from described unit of setting up to described.
6. electrical quantity sensor as claimed in claim 1, is characterized in that,
Described first communication control unit receives via described first connecting portion and sets up the relevant data of electric current that unit measures from described unit of setting up to described.
7. the electrical quantity sensor according to any one of claim 1 ~ 6, is characterized in that,
Described electrical quantity sensor also has:
Signal path, is formed between described first calculating part and described first communication control unit;
Signal isolation portion, is arranged on described signal path.
8. electrical quantity sensor as claimed in claim 7, is characterized in that,
Described signal isolation portion comprises isolator.
9. electrical quantity sensor set up a unit, can communicate with electrical quantity sensor according to claim 1, and have:
Second connecting portion, sets up unit and the electrical connection of described electrical quantity sensor described in making;
Second communication control part, receives described synchronizing pulse via described second connecting portion from described electrical quantity sensor;
Second electric current measurement unit, using the described synchronizing pulse from described second communication control part as triggering, measures the electric current in described second measurement object position flowing.
10. electrical quantity sensor as claimed in claim 9 set up unit, it is characterized in that,
Described second communication control part receives digital signal for representing the voltage that described electrical quantity sensor measures via described second connecting portion from described electrical quantity sensor,
Described unit of setting up also has the second calculating part calculated the electricity at described second measurement object position,
The electric current that described second calculating part measures based on described second electric current measurement unit and the voltage represented by described digital signal, calculate electricity.
11. electrical quantity sensors as claimed in claim 10 set up unit, it is characterized in that,
Described digital signal represents at the voltage measured as the period 1 during described measurement,
The electric current that described second calculating part measures in the described period 1 based on described second electric current measurement unit and described digital signal, the electricity in second round to the described period 1 calculates,
Described second round be immediately preceding the described period 1 after described measurement during.
12. electrical quantity sensors as claimed in claim 10 set up unit, it is characterized in that,
The data relevant to the electricity that described second calculating part calculates send to described electrical quantity sensor via described second connecting portion by described second communication control part.
13. electrical quantity sensors as claimed in claim 9 set up unit, it is characterized in that,
The data relevant to the electric current that described second electric current measurement unit measures send to described electrical quantity sensor via described second connecting portion by described second communication control part.
14. 1 kinds of voltameter examining systems, is characterized in that,
Have:
Electrical quantity sensor, the electric current flow to the first measurement object position in alternating circuit and the voltage of described alternating circuit measure, and calculate the electricity at described first measurement object position,
Set up unit, can communicate with described electrical quantity sensor, the electric current of the second measurement object position flowing in described alternating circuit is measured;
Described electrical quantity sensor repeatedly to described set up unit send with the measurement with the time span preset during the synchronizing pulse of initial point synchronised,
Describedly set up unit using the reception of described synchronizing pulse as triggering, the electric current in described second measurement object position flowing is measured.
15. voltameter examining systems as claimed in claim 14, is characterized in that,
Described electrical quantity sensor generates the digital signal of the data for representing the voltage measured during described measurement, and sends digital signal to described unit of setting up,
Described unit of setting up sets up the electric current that unit measures and the voltage represented by described digital signal based on described, calculates the electricity at described second measurement object position.
16. voltameter examining systems as claimed in claim 14, is characterized in that,
Described unit of setting up sends to described data of setting up electric current that unit measures relevant to described electrical quantity sensor,
Described electrical quantity sensor sets up electric current that unit measures and the voltage that described electrical quantity sensor measures based on described, calculates the electricity at described second measurement object position.
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