CN103293372A - Power sensors, additional units of power sensors, and power measurement system - Google Patents
Power sensors, additional units of power sensors, and power measurement system Download PDFInfo
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- CN103293372A CN103293372A CN2013100520020A CN201310052002A CN103293372A CN 103293372 A CN103293372 A CN 103293372A CN 2013100520020 A CN2013100520020 A CN 2013100520020A CN 201310052002 A CN201310052002 A CN 201310052002A CN 103293372 A CN103293372 A CN 103293372A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
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- 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
Abstract
The invention provides a power measurement system capable of increasing measurement precision of the power by using a structure as simple as possible, and power sensors and additional units of the power sensors which are used for constituting the power measurement system. The power measurement system (100) comprises a power sensor (1) for measuring a current flowing in a first measurement objective part of an alternating current circuit (5) and the voltage of the alternating current circuit (5) to calculate the power of the first measurement objective part, and the additional units (power sensors (2-4)) capable of communicating with the power sensor (1) and measuring the current flowing in a second measurement objective part of the alternating current circuit. The power sensor (1) sends synchronization pulse synchronous to the end points of a measuring period with a predetermined time length to the additional units repeatedly. The additional units measure the current flowing in the second measurement objective part by using the reception of the synchronization pulse as a trigger.
Description
Technical field
The present invention relates to electrical quantity sensor, this electrical quantity sensor set up the unit and by electrical quantity sensor and set up the voltameter examining system that the unit constitutes.
Background technology
In recent years, be purpose with energy-conservation grade, the scheme to the detailed management of electric weight has been proposed.For example, under the situation of factory, require a plurality of devices power consumption is separately monitored.
Proposed to be used for to require corresponding coulometry device with this.For example TOHKEMY 2004-85413 communique (patent documentation 1) discloses the multicircuit electric exploration device that can measure the power consumption of a plurality of load equipments.This determinator has the CT(current transformer that arranges at each load equipment), instrumentation unit and a main unit of arranging corresponding to each CT.A plurality of instrumentations unit has electric power calculating part and nonvolatile memory separately.The electric power calculating part comes the power consumption of load equipment is calculated based on the voltage signal that the current signal suitable with the detected electric current of CT and distribution feeder provide.The specified information of nonvolatile memory storage CT.Main unit is set the ratings of this instrumentation unit based on the specified information of storing in the nonvolatile memory of each instrumentation unit.
TOHKEMY 2005-55404 communique (patent documentation 2) disclose the multicircuit kilowatt meter with and set up the unit.The main part of multicircuit kilowatt meter is measured the voltage of alternating circuit and the electric current of instrumentation point, and exports this voltage of measuring from connector.Set up the unit and be connected with the connector of multicircuit kilowatt meter, receive the voltage that the multicircuit kilowatt meter is measured.Set up the unit electric current of other instrumentation points of alternating circuit is measured, and based on the voltage that this electric current of measuring and main part are measured, calculate electric weight.
Patent documentation 1: TOHKEMY 2004-85413 communique
Patent documentation 2: TOHKEMY 2005-55404 communique
In the multicircuit electric exploration device of patent documentation 1 record, instrumentation unit and CT need be set at the circuit of each instrumentation object.And then the instrumentation unit communicates with main unit separately.Therefore, need with the order wire of the number of instrumentation unit.Thereby, if adopt the structure of patent documentation 1 record, then exist the quantity for the key element that constitutes the voltameter examining system to become how such problem.
In addition, for the easy electric weight to a plurality of instrumentations position monitors, and the voltameter that often will carry out instrumentation to the electric weight at each instrumentation position is concentrated and is arranged on 1 position.A plurality of voltameters for example are arranged on the inside of a switchboard or a distributor cap.But, if adopt the structure of patent documentation 1 record, then need to count with the platform of instrumentation unit the order wire of equal number.Therefore, be arranged in a plurality of instrumentations unit with patent documentation 1 record under the situation of inside of distributor cap, might make the inside of distributor cap become numerous and diverse.
On the other hand, if adopt the structure of patent documentation 2 records, then can decide the platform number of setting up the unit according to the quantity of instrumentation object-point.Set up the unit and be connected with main part by connector, receive the simulating signal of expression voltage data from main part.Set up the unit electric current is carried out instrumentation, and calculate electric weight based on this electric current of institute's instrumentation with from the voltage data of main part.The value of setting up the electric weight that the unit calculates sends to main part via above-mentioned connector.Therefore, if adopt the structure of patent documentation 2 records, then compare with the structure of patent documentation 1 record, can reduce the quantity of order wire.Its result owing to can simplify the structure of voltameter examining system, descends so can realize the cost of voltameter examining system.
Following explanation utilizes simulating signal to transmit the reason of voltage data in patent documentation 2.In main part, magnitude of voltage is carried out analog/digital conversion and exports digital signal, and obtain based on digital signal under the situation of magnitude of voltage setting up the unit, at main part and set up unit signal separately and need the time in handling.Therefore, in main part the moment of instrumentation voltage and in setting up the unit bad student's deviation between moment of instrumentation electric current.Its result contains error in the value of the electric weight that calculates.
But, under the situation of the structure that patent documentation 2 is put down in writing, along with the platform number of setting up the unit increases, and simulating signal is significantly worsened with respect to original signal.That is, in the longest the setting up in the unit of transmitting range from the simulating signal of main part, magnitude of voltage accurately might can't be obtained.Therefore, might in setting up the value of the electric weight that calculates in the unit, this contain error.
As mentioned above, by electrical quantity sensor and set up in the voltameter examining system that the unit constitutes, require to utilize simple as far as possible structure to improve the instrumentation precision of electric weight.
Summary of the invention
The purpose of this invention is to provide for the electrical quantity sensor of the voltameter examining system that constitutes the instrumentation precision to utilize simple as far as possible structure to improve electric weight and set up the unit.
According to a situation of the present invention, electrical quantity sensor has: the first electric current instrumentation portion, carry out instrumentation to the electric current that flows at the first instrumentation object position of alternating circuit; Voltage instrumentation portion carries out instrumentation to the voltage at the first instrumentation object position; First calculating part based on the electric current of first institute of the electric current instrumentation portion instrumentation and the voltage of institute of voltage instrumentation portion instrumentation, comes the electric weight at the first instrumentation object position is calculated.First calculating part export repeatedly with the instrumentation with predefined time span during the synchronous synchronizing pulse of end points.Electrical quantity sensor also has: first connecting portion, be used for making and set up the unit and electrical quantity sensor is electrically connected, described set up the unit with the reception of synchronizing pulse as triggering, come the electric current that flows at the second instrumentation object position of alternating circuit is carried out instrumentation; First communication control unit.First communication control unit sends from electrical quantity sensor synchronizing pulse via first connecting portion to setting up the unit.
If adopt this structure, then set up the reception of the synchronizing pulse that electrical quantity sensor is sent the unit and as triggering electric current is carried out instrumentation.Synchronizing pulse represent electrical quantity sensor instrumentation during end points.But, electrical quantity sensor and set up the unit and can during same instrumentation, carry out instrumentation.Thus, can improve by electrical quantity sensor and the precision of setting up the electric weight that the instrumentation of unit calculates.
The time span of setting before " the predefined time span during the instrumentation " refers to during this instrumentation.Therefore, in one embodiment, it is constant that the time span during the instrumentation keeps, and voltage and electric current are carried out instrumentation.In other embodiments, on one side also can change time span during the instrumentation, Yi Bian voltage and electric current are carried out instrumentation.
" end points during the instrumentation " also can be initial point during the instrumentation and any in the terminal point.Have under the situation about producing continuously during the instrumentation of constant time span, the end points during the instrumentation is the terminal point during certain instrumentation and is initial point during its next instrumentation.Under the situation of carrying out instrumentation off and on, electrical quantity sensor also can send first synchronizing pulse of the initial point during the expression instrumentation and second synchronizing pulse of the terminal point during this instrumentation of expression to setting up the unit.
" output repeatedly " refers to for example so repeatedly output of periodic output.
The electric weight at the second instrumentation object position can calculate by setting up the unit, also can calculate by electrical quantity sensor.
Preferably, set up the unit based on the electric current of setting up unit institute instrumentation and be input to the voltage data of setting up in the unit, come the electric weight at the second instrumentation object position is calculated.First calculating part generates the digital signal be illustrated in the data of the voltage of institute's instrumentation during the instrumentation and exports digital signal.First communication control unit will send to setting up the unit via first connecting portion from the digital signal of first calculating part.
If adopt this structure, represent that then the digital signal of the voltage of electrical quantity sensor institute instrumentation sends to setting up the unit from electrical quantity sensor.The voltage at instrumentation object position is not carried out instrumentation even set up the unit, can the electric weight at this instrumentation object position be calculated yet.Therefore, in setting up the unit, can omit for the distribution that the voltage of alternating circuit is carried out instrumentation.
And then, because the data of the voltage of expression institute instrumentation transmit with the form of digital signal, so can reduce electrical quantity sensor and set up the radical of the signal wire between the unit.Therefore, can realize the cost degradation of voltameter examining system.
And then voltage data sends to setting up the unit by digital signal.Digital signal has the simulating signal compared and is difficult to worsen such characteristic.Therefore, owing to send magnitude of voltage accurately to setting up the unit, so can improve the computational accuracy at the electric weight of setting up the unit.
Preferably, digital signal is represented the voltage as the period 1 institute's instrumentation during instrumentation.First calculating part is exported digital signal in second round, and second round based on voltage and electric current at period 1 institute's instrumentation, come the electric weight of period 1 is calculated.Be corresponding to during the instrumentation that is right after after the period 1 second round.
If adopt this structure, then can suppress the increase of the processing load of first calculating part.For example, set up the unit the period 1 electric current is carried out instrumentation and situation that the electric weight of period 1 is calculated under, require electrical quantity sensor when voltage is carried out instrumentation, just generate expression institute instrumentation voltage digital signal and send to setting up the unit.Therefore might increase the processing load of first calculating part.If adopt this structure, electrical quantity sensor is in the digital signal of exporting the voltage that is illustrated in period 1 institute's instrumentation second round that is right after after the period 1.Set up the unit and use the data of the voltage of representing in the data of the electric current of period 1 institute's instrumentation with by digital signal, come the electric weight of period 1 is calculated.Therefore, can suppress the increase of the processing load of first calculating part.
Preferably, during the instrumentation be comprise AC wave shape a plurality of cycles during.First calculating part generates reference data and differential data, and reference data and differential data exported as digital signal, described reference data is illustrated in the data of the magnitude of voltage of first cycle institute's instrumentation in a plurality of cycles, and described differential data is the data that are illustrated in the difference between the corresponding voltage value in the magnitude of voltage of the remaining cycle institute's instrumentation in a plurality of cycles and the reference data.
If adopt this structure, can guarantee from electrical quantity sensor to the precision of setting up the voltage data that the unit sends and reduce the size of these data.Because the voltage by the electrical quantity sensor instrumentation is alternating voltage, so its constant period.Therefore, think that only magnitude of voltage can change in time.If the employing said structure then generates as differential data by the variable quantity with magnitude of voltage, thereby can guarantee the precision of voltage data, and reduce the size of these data.
Preferably, first communication control unit receives the data relevant with setting up the electric weight that calculates the unit via first connecting portion from setting up the unit.
If adopt this structure, then electrical quantity sensor can not only have the data of the electric weight (i.e. the electric weight at the first instrumentation object position) that this electrical quantity sensor calculates, and can have the data of the electric weight (i.e. the electric weight at the second instrumentation object position) of setting up the unit and calculating.
Preferably, first communication control unit receives the data relevant with the electric current of setting up unit institute instrumentation via first connecting portion from setting up the unit.
If adopt this structure, then electrical quantity sensor can not only calculate the electric weight at the first instrumentation object position, and can the electric weight at the second instrumentation object position be calculated.Therefore, electrical quantity sensor can have the data of the first instrumentation object position and the second instrumentation object position electric weight separately.
Preferably, electrical quantity sensor also has: signal path is formed between first calculating part and first communication control unit; Signal isolation portion is arranged on the signal path.
Preferably, signal isolation portion comprises isolator.
If adopt this structure, can guarantee the electrical isolation with high voltage circuit (for example voltage instrumentation portion or electric current instrumentation portion), and can realize electrical quantity sensor and set up communication between the unit.
According to another situation of the present invention, the unit of setting up of electrical quantity sensor is the unit of setting up that can communicate with above-mentioned electrical quantity sensor.Setting up the unit has: second connecting portion, set up unit and electrical quantity sensor electrical connection for making; The second communication control part receives synchronizing pulse via second connecting portion from electrical quantity sensor; The second electric current instrumentation portion will come the electric current that flows at the second instrumentation object position is carried out instrumentation from the synchronizing pulse of second communication control part as triggering.
If adopt this structure, then set up the reception of the synchronizing pulse that electrical quantity sensor is sent the unit and as triggering electric current is carried out instrumentation.Synchronizing pulse represent electrical quantity sensor instrumentation during end points.Therefore, electrical quantity sensor and set up the unit and can during same instrumentation, carry out instrumentation.Thus, can improve by electrical quantity sensor and the precision of setting up the electric weight that the instrumentation of unit calculates.
Preferably, the second communication control part receives the digital signal of the voltage of expression electrical quantity sensor institute instrumentation from electrical quantity sensor via second connecting portion.Set up the unit and also have second calculating part that the electric weight to the second instrumentation object position calculates.Second calculating part comes electric weight is calculated based on the electric current of second institute of the electric current instrumentation portion instrumentation with by the voltage that described digital signal is represented.
If adopt this structure, the voltage at instrumentation object position is not carried out instrumentation even set up the unit, also can the electric weight at this instrumentation object position be calculated.Therefore, need not for the voltage of alternating circuit to setting up the distribution that the unit transmits.And then the data of voltage are transmitted as digital signal, therefore can suppress the deterioration of voltage data.Therefore, can improve the precision of setting up the electric weight that calculates the unit.And then, because voltage data is transmitted with the form of digital signal, so can reduce electrical quantity sensor and set up the radical of the signal wire between the unit.Therefore, can constitute the voltameter examining system that can improve the instrumentation precision of electric weight with low cost.
Preferably, digital signal is illustrated in the voltage as the institute's instrumentation of the period 1 during the instrumentation.Second calculating part is based on electric current and the digital signal of the second electric current instrumentation portion at period 1 institute's instrumentation, and next electric weight to the period 1 calculates in second round.During being the instrumentation that is right after after the period 1 second round.
If adopt this structure, then set up the unit and can receive electrical quantity sensor in the data of voltage of institute's instrumentation on identical with the opportunity of the instrumentation of the electric current of setting up unit opportunity.Therefore, can guarantee to set up the unit to the precision of the calculating of electric weight.
Preferably, the second communication control part sends the relevant data of calculating with second calculating part of electric weight via second connecting portion to electrical quantity sensor.
If adopt this structure, then the electric quantity data that generates by the calculating of setting up the unit is sent to electrical quantity sensor.Thus, in electrical quantity sensor, can not only have the data of the electric weight (i.e. the electric weight at the first instrumentation object position) that is calculated by electrical quantity sensor, and can have by the data of setting up the electric weight (i.e. the electric weight at the second instrumentation object position) that calculates the unit.
Preferably, the second communication control part sends the data relevant with the electric current of second institute of the electric current instrumentation portion instrumentation via second connecting portion to electrical quantity sensor.
If adopt this structure, then in electrical quantity sensor, can calculate the data of the electric weight at the second instrumentation object position.Therefore, in electrical quantity sensor, can not only have the data of the electric weight at the first instrumentation object position that electrical quantity sensor calculates, and have the data of the electric weight at the second instrumentation object position.
According to another situation of the present invention, the voltameter examining system has: electrical quantity sensor, the electric current that flows at the first instrumentation object position of alternating circuit and the voltage of alternating circuit are carried out instrumentation, and the electric weight at the first instrumentation object position is calculated; Set up the unit, can communicate with electrical quantity sensor, the electric current that flows at the second instrumentation object position of alternating circuit is carried out instrumentation.Electrical quantity sensor repeatedly to set up the unit send with the instrumentation with predefined time span during the synchronous synchronizing pulse of end points.Set up the unit with the reception of synchronizing pulse as triggering, come the electric current that flows at the second instrumentation object position is carried out instrumentation.
If adopt this structure, set up the reception of the synchronizing pulse that electrical quantity sensor is sent the unit and as triggering electric current is carried out instrumentation.Synchronizing pulse represent electrical quantity sensor instrumentation during end points.Therefore, electrical quantity sensor and set up the unit and can during same instrumentation, carry out instrumentation.Thus, can improve based on electrical quantity sensor and the precision of setting up the electric weight that the instrumentation of unit calculates.
Preferably, electrical quantity sensor generates the digital signal be illustrated in the data of the voltage of institute's instrumentation during the instrumentation, and sends digital signal to setting up the unit.Set up the unit based on the electric current of setting up unit institute instrumentation with by the voltage that digital signal is represented, come the electric weight at the second instrumentation object position is calculated.
If adopt this structure, the voltage at the second instrumentation object position is not carried out instrumentation even set up the unit, also can the electric weight at this instrumentation object position be calculated.And then, because being sent to as digital signal, the data of voltage set up the unit, send voltage data so can guarantee precision ground to setting up the unit.Thus, can improve instrumentation precision at the electric weight of setting up the unit.And then, because voltage data is transmitted with the form of digital signal, so can reduce electrical quantity sensor and set up the radical of the signal wire between the unit.Therefore, can constitute the voltameter examining system that can improve the instrumentation precision of electric weight with low cost.
Preferably, setting up the unit sends the data relevant with the electric current of setting up unit institute instrumentation to electrical quantity sensor.Electrical quantity sensor comes the electric weight at the second instrumentation object position is calculated based on the voltage of the electric current of setting up unit institute instrumentation and electrical quantity sensor institute instrumentation.
If adopt this structure, then in electrical quantity sensor, can calculate the data of the electric weight at the second instrumentation object position.Therefore, in electrical quantity sensor, can not only have the data of the electric weight at the first instrumentation object position of being calculated by electrical quantity sensor, and can have the data of the electric weight at the second instrumentation object position.
If adopt the present invention, then can constitute and to utilize simple as far as possible structure to improve the voltameter examining system of the instrumentation precision of electric weight.
Description of drawings
Fig. 1 is the integrally-built skeleton diagram of the voltameter examining system of expression first embodiment of the present invention.
Fig. 2 is the synoptic diagram that example is set of expression voltameter examining system shown in Figure 1.
Fig. 3 is the functional block diagram of structure of major part of the electrical quantity sensor (master unit (master unit)) of expression first embodiment of the present invention.
Fig. 4 is the functional block diagram of structure of the major part of setting up unit (slave unit (slave unit)) of expression first embodiment of the present invention.
Fig. 5 is for the instrumentation processing of explanation first embodiment of the present invention and the precedence diagram of computing.
Fig. 6 is for the oscillogram of explanation slave unit to beginning and the end of the instrumentation of electric current.
Fig. 7 is for the oscillogram that the data compression of being undertaken by master unit is described.
Fig. 8 is the figure for explanation structure of the voltage data of transmission from master unit to slave unit.
Fig. 9 is the electrical quantity sensor of expression first embodiment of the present invention and the figure that sets up the structure example of the connecting portion that the unit has.
Figure 10 is the figure of structure example of bus of the comparative example of expression first embodiment.
Figure 11 is for the instrumentation processing of explanation embodiments of the present invention 2 and the precedence diagram of computing.
Wherein, description of reference numerals is as follows:
1～4,41,42 electrical quantity sensors, 1a, 1b, 2a, 2b, 3a, 3b, 4a, the 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 instrumentation portions, the 11a bleeder circuit, 11b, 12b, 22b A/D translation circuit, 12,22 electric current instrumentation portions, 12a, 22a current/voltage translation circuit, 13,23 communication control units, 14,24,14a, the 24a connecting portion, 15,25 signal paths, 15a, the 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 elaborated.In addition, to the identical Reference numeral of part mark identical or suitable among the figure, and do not repeat its explanation.
[embodiment 1]
Fig. 1 is the integrally-built skeleton diagram of the voltameter examining system of expression 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 is corresponding to " electrical quantity sensor " of the present invention.That electrical quantity sensor 2～4 corresponds respectively to is of the present invention " electrical quantity sensor set up unit ".
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 for example is device or the equipment in the factory.
In Fig. 1, the example as the distribution system of alternating circuit 5 shows three-phase 3 line formulas.The distribution system of alternating circuit 5 is not limited to three-phase 3 line formulas, also can be for example single-phase 2 line formulas, single-phase 3 line formulas or three-phase 4 line formulas.
The electric current at the voltage of 1 pair of alternating circuit 5 of electrical quantity sensor and the first instrumentation object position carries out instrumentation.The first instrumentation object position is corresponding to the part of transmitting alternating electromotive force between alternating circuit 5 and load device 6a.Therefore, the first instrumentation object position is not limited to 1 point.Specifically, electrical quantity sensor 1 is connected with line of electric force 5a, 5b, 5c, and the voltage of alternating circuit 5 is carried out instrumentation.And current transformer 1a, 1b are connected with electrical quantity sensor 1. Current transformer 1a, 1b detect the electric current that flows at line of electric force 5a, 5b respectively.The signal that electrical quantity sensor 1 utilizes current transformer 1a, 1b to export carries out instrumentation to the electric current at the first instrumentation object position.
In this embodiment, electrical quantity sensor 1 will represent that also the digital signal of the voltage of 1 instrumentation of electrical quantity sensor sends to each electrical quantity sensor 2～4.Electrical quantity sensor 1 is based on the voltage of institute's instrumentation and the electric current of institute's instrumentation, and the electric weight at the first instrumentation object position is calculated.Each electrical quantity sensor 2～4 calculates electric weight based on the data of the electric current of institute's instrumentation with by the voltage data of representing from the digital signal of electrical quantity sensor 1.
The electric weight of obtaining by calculating is not limited to the power consumption of load device.For example have motor at load device, and this motor is regenerated under the situation of action, also can obtain the generating electric weight of motor.
In this embodiment, the data of the electric weight that will obtain by calculating of each electrical quantity sensor 2～4 send to electrical quantity sensor 1 as digital signal.Therefore, electrical quantity sensor 1 keeps the data of the electric weight obtained by each electrical quantity sensor 1～4.The data of the electric weight that electrical quantity sensor 1 will be obtained by each electrical quantity sensor 1～4 send to data processing equipment 7.Data processing equipment 7 is realized by for example carrying out the personal computer of regulated procedure.
The supply voltage of electrical quantity sensor 1～4 can be provided respectively independently.Therefore, electrical quantity sensor 1～4 can be connected with power supply respectively.Perhaps, also can adopt from electrical quantity sensor 1 to electrical quantity sensor 2～4 structures that supply voltage is provided respectively.
Fig. 2 is the synoptic diagram that example is set of expression voltameter examining system shown in Figure 1.With reference to Fig. 2, electrical quantity sensor 1～4 is arranged on for example inside of distributor cap 8.As shown in Figure 2, be provided with for example DIN guide rail of guide rail 9(in the inside of distributor cap 8).Electrical quantity sensor 1～4 is installed in respectively on the guide rail 9.Electrical quantity sensor 1 and each electrical quantity sensor 2～4 communicate via telecommunication cable 10.In one embodiment, the communication mode between electrical quantity sensor is that serial is current.
As mentioned above, the calculating of the electric weight of 1 pair of each electrical quantity sensor 2～4 of electrical quantity sensor is controlled.That is, in voltameter examining system 100, electrical quantity sensor 1 is as master unit performance function, and each electrical quantity sensor 2～4 is as slave unit performance function.According to Fig. 1 and structure shown in Figure 2, the quantity of slave unit is 3, but is not limited to this.Can increase and decrease the quantity of slave unit according to the quantity at instrumentation object position.
Fig. 3 is the functional block diagram of structure of major part of the electrical quantity sensor (master unit) of expression first embodiment of the present invention.With reference to Fig. 3, electrical quantity sensor 1 comprises voltage instrumentation portion 11, electric current instrumentation portion 12, counting circuit 18, communication control unit 13, connecting portion 14, the signal path 15 that comprises isolator (isolator) 15a, storage part 19.
Electric current instrumentation portion 12 couples of line of electric force 5a, 5b electric current I 1, I3 separately carries out instrumentation.Current transformer 1a output and electric current I 1 proportional electric current I 1a.Current transformer 1b output and electric current I 3 proportional electric current I 3a.Current/voltage translation circuit 12a is transformed to voltage with electric current I 1a, I3a, also this voltage is amplified.Thus, current/voltage translation circuit 12a generates the voltage of the intensity that is suitable for instrumentation.The voltage that the current/voltage translation circuit of A/D translation circuit 12b 12a exports is carried out sampling and A/D conversion.Thus, generate the numerical data of expression electric current I 1, I3 value separately.Electric current instrumentation portion 12 realizes " the first electric current instrumentation portion " that " electrical quantity sensor " of the present invention has.
Counting circuit 18 generates the numerical data of the value that is illustrated in the mobile electric current I 2 of line of electric force 5c based on from the expression electric current I 1 of electric current instrumentation portion 12, the numerical data of I3 value separately.Because electric current I 1, I2, I3 add up to 0, so can calculate the value of electric current I 2 based on the value of electric current I 1, I3.Voltage Va, Vb, the numerical data of Vc and the numerical data of electric current I 1～I3 that counting circuit 18 uses voltage instrumentation portion 11 to export are calculated the electric weight at the first instrumentation object position.Counting circuit 18 is stored in the storage part 19 electric quantity data as result of calculation.Counting circuit 18 is realized " first calculating part " that " electrical quantity sensor " of the present invention has.
The synchronizing pulse on the opportunity (timing) of the beginning of the instrumentation of counting circuit 18 generation expression voltage Va, Vb, Vc and electric current I 1, I2, I3.Counting circuit 18 these synchronizing pulses of output.
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 the communication control unit 13.In the way of signal path 15, be provided with isolator 15a.Isolator 15a makes counting circuit 18 and communication control unit 13 insulation.Under the high situation of the magnitude of voltage of alternating circuit 5 and current value, voltage instrumentation portion 11 and electric current instrumentation portion 12 can become high voltage circuit.Electrical isolation in order to ensure relative high voltage 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 for example is the digital isolator of capacitor type.But signal isolation portion also can realize by for example photo-coupler.
Counting circuit 18 sends via signal path 15 synchronizing pulse and digital signal (voltage data) to communication control unit 13.Communication control unit 13 will be exported to connecting portion 14 from digital signal and the synchronizing pulse of counting circuit 18.Receive at communication control unit 13 under the situation of the digital signal (electric quantity data) from slave unit, communication control unit 13 sends via signal path 15 this digital signal to counting circuit 18.At this moment, counting circuit 18 electric quantity data that slave unit is sent is stored in the storage part 19.For example, the transmission of 13 pairs of data of communication control unit and receiving based on UART(UniversalAsynchronous Receiver Transmitter: UART Universal Asynchronous Receiver Transmitter) communication.Communication control unit 13 is realized " 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) be 10 outputs from connecting portion 14 to telecommunication cable, 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) that sends from the connecting portion 24 of electrical quantity sensor 2 is via connecting portion 14 inputs of telecommunication cable 10 to electrical quantity sensor 1.Connecting portion 14 for example is made of bus and bonder terminal.Connecting portion 14 is realized " first connecting portion " that " electrical quantity sensor " of the present invention has.
Fig. 4 is the functional block diagram of structure of the major part of setting up unit (slave unit) of expression first embodiment of the present invention.The structure of electrical quantity sensor 2～4 is mutually the same.Therefore, in Fig. 4, the structure as the electrical quantity sensor 2 of representative is shown.
With reference to Fig. 4, the structure difference of the structure of electrical quantity sensor 2 and electrical quantity sensor 1 is, do not comprise voltage instrumentation portion, and the structure of other parts is substantially the same with the structure of electrical quantity sensor 1.Specifically, electrical quantity sensor 2 comprises electric current instrumentation portion 22, counting circuit 28, communication control unit 23, connecting portion 24, the signal path 25 that comprises isolator 25a, storage part 29.
Electric current instrumentation portion 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 the treating apparatus (for example CPU).In addition, communication control unit 23 also can be realized by for example CPU.
Electric current instrumentation portion 22 couples of line of electric force 5a, 5b electric current I 4, I6 separately carries out instrumentation.Current transformer 2a output and electric current I 4 proportional electric current I 4a.Current transformer 2b output and electric current I 6 proportional electric current I 6a.Current/voltage translation circuit 22a is transformed to voltage with electric current I 4a, I6a, also this voltage is amplified.Thus, current/voltage translation circuit 22a generates the voltage of the intensity that is suitable for instrumentation.The voltage that the current/voltage translation circuit of A/D translation circuit 22b 22a exports is carried out sampling and A/D conversion.Thus, generate the numerical data of expression electric current I 4, I6 value separately.That electric current instrumentation portion 22 realizes is of the present invention " electrical quantity sensor set up unit " " the second electric current instrumentation portion " that have.
Counting circuit 28 generates the numerical data of the value that is illustrated in the mobile electric current I 5 of line of electric force 5c based on the numerical data of expression electric current I 4, I6 value separately.The generation method of the numerical data of the value of expression 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 synchronizing pulse and represents the digital signal of the value of voltage Va, Vb, Vc.A/D translation circuit 22b begins sampling and A/D conversion with the reception of this synchronizing pulse as triggering.Counting circuit 28 uses the value of electric current I 4～I6 and by voltage Va, the Vb of received digital signal acquisition, the value of Vc, the electric weight at the second instrumentation object position is calculated.Counting circuit 28 will be stored in the storage part 29 as the electric quantity data of result of calculation.That counting circuit 28 is realized is of the present invention " electrical quantity sensor set up unit " " second calculating part " that have.
Signal path 25 is arranged between counting circuit 28 and the communication control unit 23.In the way of signal path 25, be provided with isolator 25a.15a is identical with isolator, and isolator 25a is the signal isolation portion that makes counting circuit 28 and communication control unit 23 insulation.Isolator 25a for example is the digital isolator of capacitor type.Replace isolator 25a but can rise, for example realized by photo-coupler.
Connecting portion 24 is electrically connected with electrical quantity sensor 1 via telecommunication cable 10.Synchronizing pulse and digital signal (voltage data) be 24 inputs from telecommunication cable 10 to connecting portion, send to communication control unit 23 then.On the other hand, the digital signal (electric quantity data) that sends of communication control unit 23 from connecting portion 24 via connecting portion 14 inputs of telecommunication cable 10 to electrical quantity sensor 1.Connecting portion 24 for example is made of bus and bonder terminal.That connecting portion 24 is realized is of the present invention " electrical quantity sensor set up unit " " second connecting portion " that have.
As shown in Figure 4, owing in electrical quantity sensor 2, voltage is not carried out instrumentation, be used for electrical quantity sensor 2(slave unit so omitted) distribution that is connected with each line of electric force 5a, 5b, 5c.Therefore, according to this embodiment, can reduce the quantity of the distribution that in the voltameter examining system, uses.Particularly, under the many situations of the quantity of slave unit, the effect that can save the radical of distribution becomes remarkable.
As mentioned above, in this embodiment, to each phase instrumentation electric current and voltage of three-phase alternating current.But, following, being that representative describes to the electric current of 1 phase in the three-phase and the instrumentation of voltage.The electric current of remaining 2 phases and the instrumentation of voltage are also undertaken by the method identical with the measuring method of following explanation.
Fig. 5 is for the instrumentation processing of explanation first embodiment of the present invention and the precedence diagram of computing.With reference to Fig. 5, T0, T1, T2, T3 have predefined time span during the instrumentation.In this embodiment, the time span of T0～T3 is constant during the instrumentation.
At moment t1, master unit (electrical quantity sensor 1) sends synchronizing pulse to slave unit (as the electrical quantity sensor 2 of representative).Thus, during the instrumentation T0 finish and instrumentation during T1 begin.Master unit also will T0 obtains during instrumentation voltage data send to slave unit as digital signal.
At moment t1, master unit begins the instrumentation to voltage and electric current.Thus, obtain voltage data and the current data of T1 during the instrumentation.Voltage data and current data that master unit also obtains based on T0 during instrumentation are calculated the electric weight of T0 during the instrumentation.
Slave unit is by receiving synchronizing pulse at moment t1, thereby holds the beginning of T1 during the end of T0 during the instrumentation and the instrumentation.Slave unit begins instrumentation to electric current at moment t1.Thus, slave unit obtains the current data of T1 during the instrumentation.
Slave unit with instrumentation during during the instrumentation before the T0 data of the electric weight of (not shown in Fig. 5) send to master unit as digital signal.And then the voltage data of T0 comes the electric weight of T0 during the instrumentation is calculated during the instrumentation that slave unit sends based on the current data of obtaining at T0 during the instrumentation and master unit.
The same processing of processing among T0, the T1 during T2, T3 execution and the instrumentation during the instrumentation.At moment t2, master unit sends synchronizing pulse to slave unit.Thus, during the instrumentation T1 finish and instrumentation during T2 begin.Master unit also will T1 obtains during instrumentation voltage data send to slave unit as digital signal.T2 during instrumentation, master unit carries out instrumentation to voltage and electric current.And then master unit comes the electric weight of T1 during the instrumentation is calculated based on voltage data and current data that T1 during instrumentation obtains.
During instrumentation among the T2, slave unit with instrumentation during the data of electric weight of T0 send to master unit as digital signal.And then slave unit carries out instrumentation to electric current.And then during instrumentation among the T2, the voltage data of T1 comes the electric weight of T1 during the instrumentation is calculated during the instrumentation that slave unit sends based on the current data of obtaining at T1 during the instrumentation and master unit.
At moment t3, master unit sends synchronizing pulse to slave unit.Thus, during the instrumentation T2 finish and instrumentation during T3 begin.Master unit also will T2 obtains during instrumentation voltage data send to slave unit as digital signal.T3 during instrumentation, master unit carries out instrumentation to voltage and electric current.And then master unit comes the electric weight of T2 during the instrumentation is calculated based on voltage data and current data that T2 during instrumentation obtains.
T3 during instrumentation, slave unit with instrumentation during the data of electric weight of T1 send to master unit as digital signal.And then slave unit carries out instrumentation to electric current.And then during instrumentation among the T3, the voltage data of T2 comes the electric weight of T2 during the instrumentation is calculated during the instrumentation that slave unit sends based on the current data of obtaining at T2 during the instrumentation and master unit.
Processing shown in Figure 5 is following to be described.The counting circuit 18 of electrical quantity sensor 1 is exported digital signal in second round, and based on voltage and electric current at the period 1 instrumentation, and the electric weight of period 1 is calculated.Equally, the counting circuit 28 of electrical quantity sensor 2 based on by electric current instrumentation portion 22 at the electric current of period 1 instrumentation with from the digital signal of electrical quantity sensor 1, the electric weight in second round to the period 1 calculates." second round " is corresponding to being right after during " period 1 " instrumentation afterwards.That is, if the period 1 is T0 during the instrumentation, then second round corresponding to instrumentation during T1.If the period 1 is T1 during the instrumentation, then second round corresponding to instrumentation during T2.
In order to calculate electric weight exactly, desired voltage values is obtained on identical opportunity with current value.In order to compare with embodiments of the present invention, suppose that the electric weight during certain instrumentation is calculated during this instrumentation.In this case, for 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 master unit obtains voltage data and slave unit receive opportunity of this voltage data must be consistent.But, owing to voltage data is sent to slave unit from master unit, so slave unit receives be later than the opportunity of voltage data on opportunity that master unit obtains voltage data.
If adopt present embodiment, then the electric weight of period 1 was calculated in second round.Therefore, slave unit can come the electric weight of period 1 is calculated based on voltage data and the current data obtained the identical opportunity in the period 1.Thus, can guarantee the computational accuracy of electric weight.
And then the electric weight to (for example T1 during the instrumentation) during a plurality of instrumentation objects position same calculates on identical opportunity (for example T2 during the instrumentation) for master unit and slave unit.Therefore, when master unit got access to electric quantity data from slave unit, the electric quantity data that master unit calculates was set up related with the electric quantity data that slave unit calculates easily.For example, realize the management of 1 pair of electric quantity data of electrical quantity sensor easily.Thus, can expect for example to write the processing of data and the high speed that reads the processing of data from storage part 19 to storage part 19.
And then master unit will send to slave unit in second round in the lump at the voltage data that the period 1 obtains.Therefore, master unit there is no need just these data to be sent to slave unit when obtaining voltage data.Thus, can suppress the increase of the processing load of master unit (counting circuit 18).
Fig. 6 is for the oscillogram of explanation slave unit to beginning and the end of the instrumentation of electric current.With reference to Fig. 6, comprise during the instrumentation that master unit sets corresponding to during 5 cycles of AC wave shape and between validation period.Be in order to set synchronously the zero hour that between master unit and slave unit, makes instrumentation between validation period.Length between validation period can be considered that for example the platform number poor, slave unit of the processing speed between master unit and slave unit (for example clock frequency) waits suitably and set.
When slave unit received synchronizing pulse, slave unit began to carry out the instrumentation of electric current from the time of reception point of this pulse.Slave unit carries out instrumentation to the electric current in 5 cycles of AC wave shape 30, temporarily stops instrumentation then, till receiving next synchronous pulse.When next slave unit received synchronizing pulse, slave unit began to carry out the instrumentation of electric current again.
Master unit generates the voltage data in 5 cycles of AC wave shape by sampling and A/D conversion.As mentioned above, master unit utilizes digital signal that this voltage data is sent to slave unit.The position of A/D conversion (bit) number is more high, and the precision of data is more high.But the size of the data that send to slave unit becomes big.
When the size of data became big, call duration time was elongated.When call duration time is elongated, might at least one the processing in for example master unit and the slave unit be impacted.On the other hand, by reducing the figure place of sampling frequency or reduction A/D conversion, can reduce the size of data.But, in this case, the precise decreasing of data.
In order to address these problems, in this embodiment, master unit compresses voltage data, and this packed data is sent to slave unit.And then master unit is carried out the compression method that is used for guaranteeing as far as possible the precision of magnitude of voltage.
Fig. 7 is for the oscillogram that the data compression of being undertaken by master unit is described.Fig. 8 is for the figure of explanation master unit to the structure of the voltage data of slave unit transmission.In addition, in Fig. 7, the voltage waveform of 1 phase is shown.With reference to Fig. 7 and Fig. 8, the number of samples in 1 cycle that exchanges is made as n.Magnitude of voltage V
11, V
12... V
1nIt is the value that is illustrated in the magnitude of voltage of period 1 instrumentation with digital value (A/D value).For example, magnitude of voltage V
11Be illustrated in the magnitude of voltage that first sampling of period 1 is obtained opportunity.N for example is 64.
Master unit (counting circuit 18) is directly preserved the magnitude of voltage that the instrumentation by the period 1 obtains.Magnitude of voltage V
11, V
12... V
1nIn processing described later, be set as reference data.
Master unit (counting circuit 18) generate be illustrated in the second round～the period 5 differential data of the difference value between the corresponding voltage value in the magnitude of voltage of instrumentation and the reference data respectively.In addition, as shown in Figure 7, in period 1～period 5 in any cycle, sampling is identical opportunity.For example, difference value Δ V
21Be magnitude of voltage and the magnitude of voltage V that constantly obtains in first sampling of second round
11Between difference value.Instrumentation value representation in the instrumentation of second round is differential data Δ V
21, Δ V
22... Δ V
2nBelow, same, in period 3～period 5, generate differential data respectively.
Because the voltage by the master unit instrumentation is alternating voltage, this constant period.Therefore, think that only magnitude of voltage might change in time.In this embodiment, second round～period 5 magnitude of voltage is separately generated as the difference with the corresponding voltage value of period 1.Thus, can guarantee the precision of second round～period 5 magnitude of voltage separately, and make size of data less than the size of reference data.For example reference data is 12 data, and differential data is 8 data.
If adopt this embodiment, then the data that transmit between master unit and slave unit are numerical datas.Thus, can reduce the quantity of master unit and slave unit signal path separately.This point is described.
Fig. 9 is the electrical quantity sensor of expression first embodiment of the present invention and the figure that sets up the structure example of the connecting portion that the unit has.With reference to Fig. 9, connecting portion 14,24 structure are mutually the same.Connecting portion 14,24 comprises pulse signal terminals P x separately, sends terminal Tx, receives terminal Rx.Receiving terminal Rx is for the signal terminal from outside receiving digital signals.Sending terminal Tx is for the terminal that sends digital signal to the outside.These terminals are connected with not shown bus.
Figure 10 is the figure of structure example of bus of the comparative example of expression 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, reception terminal Rx.Connecting portion 24a comprises pulse signal terminals P x, sends terminal Tx, receives terminal Rx1, Rx2.
Sending terminal Tx1, Tx2 and receiving terminal Rx1, Rx2 is for the terminal that transmits simulating signal.The function of pulse signal terminals P x, transmission terminal Tx and reception terminal Rx is identical with above-mentioned function.
If adopt structure shown in Figure 10, to compare with structure shown in Figure 9, it is many that the radical of required signal wire becomes.This be because transmit simulating signal and digital signal the two.As if such shown in the contrast that utilizes Fig. 9 and Figure 10, if utilize this embodiment, then can reduce the radical of signal wire.The cost that can suppress thus, the voltameter examining system.
As mentioned above, if adopt first embodiment, can reduce for the distribution of voltage instrumentation and the radical of order wire, and can guarantee the computational accuracy of electric weight.Therefore, if adopt first embodiment, then can constitute and to utilize simple as far as possible structure to improve the voltameter examining system of the instrumentation precision of electric weight.
[embodiment 2]
The one-piece construction of the voltameter examining system of embodiment 2 and structure shown in Figure 1 are same.And then the structure of master unit and slave unit and Fig. 3 and structure shown in Figure 4 are identical respectively.
In embodiment 2, master unit (electrical quantity sensor 1) from slave unit receive with by the relevant data of the electric current of each slave unit (each electrical quantity sensor 2～4) instrumentation.And master unit comes the electric weight at the second instrumentation object position is calculated based on the electric current of slave unit institute instrumentation and the voltage of master unit institute instrumentation.
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 electric current of 22 instrumentations of electric current instrumentation portion is to communication control unit 23 output.Communication control unit 23 via connecting portion 24 and telecommunication cable 10 with 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 expression data relevant with the electric current of 2 instrumentations of electrical quantity sensor via connecting portion 14.Counting circuit 18 comes the electric weight at the second instrumentation object position is calculated based on the voltage of 11 instrumentations of voltage instrumentation portion and by the electric current of representing from the digital signal of electrical quantity sensor 2.
Figure 11 is for the instrumentation processing of explanation embodiments of the present invention 2 and the precedence diagram of computing.With reference to Figure 11, same during T0, T1 during the instrumentation, T2, T3 and the instrumentation shown in Figure 5, have constant time span.
In embodiment 2, master unit (electrical quantity sensor 1) only sends synchronizing pulse to slave unit (as the electrical quantity sensor 2 of representative).Slave unit sends the data of electric current to master unit.Master unit comes the electric weight at the first instrumentation object position (master side) is calculated based on voltage and the electric current of master unit institute instrumentation.And then master unit comes the electric weight at the second instrumentation object position (slave unit side) is calculated based on the current data that voltage and the slave unit of master unit institute instrumentation sends.At that point, the instrumentation processing of embodiment 2 and computing are different with instrumentation processing and the computing of embodiment 1.
The digital signal that electrical quantity sensor 2 will be illustrated in the electric current of period 1 instrumentation sent to electrical quantity sensor 1 in second round.The counting circuit 18 of electrical quantity sensor 1 second round based on voltage and electric current at the period 1 instrumentation, come the electric weight of period 1 is calculated.Therefore, voltage data and current data that electrical quantity sensor 1 obtained based on the identical opportunity in the period 1 are come the electric weight of period 1 of electrical quantity sensor 2 is calculated." second round " is corresponding to being right after during " period 1 " instrumentation afterwards.This point is identical with embodiment 1.
As previously discussed, then same with first embodiment if adopt second embodiment, can reduce for the distribution of voltage instrumentation and the radical of order wire, and can guarantee the computational accuracy of electric weight.Therefore, if adopt second embodiment, then can constitute and to utilize simple as far as possible structure to improve the voltameter examining system of the instrumentation precision of electric weight.
In addition, in the respective embodiments described above, decide instrumentation by the time interval of synchronizing pulse during.Therefore, the length during the instrumentation is not limited to constant (for example 5 of AC wave shape cycles), and the length during the instrumentation can suitably change.Synchronous with the beginning of the instrumentation of master unit, master unit sends synchronizing pulse to slave unit.Thus, even the length variations during the instrumentation also can make the beginning of instrumentation synchronous between master unit and slave unit.
In addition, in each above-mentioned embodiment, carry out instrumentation continuously.Therefore, synchronizing pulse is represented terminal point during certain instrumentation and the initial point during the next instrumentation.But, also can carry out instrumentation off and on.In this case, for example, master unit can send first synchronizing pulse of the initial point during the expression instrumentation and second synchronizing pulse of the terminal point during this instrumentation of expression to slave unit.After slave unit receives second synchronizing pulse, during between receiving till next first synchronizing pulse corresponding to do not carry out instrumentation during.
In addition, in each above-mentioned embodiment, as 1 example of serial communication, show UART communication.But also can be with USB(Universal Serial Bus: USB (universal serial bus)) communication, CAN(Controller Area Network: controller local area network) serial communication of such other modes of communication be applied to the communication between master unit and the slave unit.
In addition, in the respective embodiments described above, master unit sends synchronizing pulse every the cycle (for example 5 cycles) of the regulation of AC wave shape.But master unit also can send synchronizing pulse every 1 cycle.The voltage data that sends from master unit to slave unit can be by above-mentioned method compression.For example, master unit generates reference data and sends to slave unit in the period 1.In second round, master unit generates differential data and sends to slave unit.Reference data generates every a plurality of cycles of regulation and gets final product.
Should be appreciated that this disclosed embodiment all is illustration rather than restrictive in all respects.Scope of the present invention is not by the explanation of above-mentioned embodiment but illustrated by claims, comprises the meaning that is equal to claim and all changes in scope certainly.
Claims (16)
1. an electrical quantity sensor is characterized in that,
Have:
The first electric current instrumentation portion carries out instrumentation to the electric current that flows at the first instrumentation object position of alternating circuit,
Voltage instrumentation portion carries out instrumentation to the voltage at the described first instrumentation object position,
First calculating part, the voltage based on the electric current of described first institute of the electric current instrumentation portion instrumentation and institute of described voltage instrumentation portion instrumentation comes the electric weight at the described first instrumentation object position is calculated;
Described first calculating part export repeatedly with the instrumentation with predefined time span during the synchronizing pulse of end points synchronised,
Described electrical quantity sensor also has:
First connecting portion is used for making and sets up the unit and is electrically connected with described electrical quantity sensor, described set up the unit with the reception of described synchronizing pulse as triggering, to carrying out instrumentation at the mobile electric current in the second instrumentation object position of described alternating circuit,
First communication control unit sends from described electrical quantity sensor described synchronizing pulse via described first connecting portion to the described unit of setting up.
2. electrical quantity sensor as claimed in claim 1 is characterized in that,
The described unit of setting up is set up the electric current of unit institute instrumentation and is input to the described voltage data of setting up the unit based on described, comes the electric weight at the described second instrumentation object position is calculated,
Described first calculating part generates the digital signal that is used for being illustrated in the data of the voltage of institute's instrumentation during the described instrumentation and exports described digital signal,
Described first communication control unit will send to the described unit of setting up via described first connecting portion from the described digital signal of described first calculating part.
3. electrical quantity sensor as claimed in claim 2 is characterized in that,
Described digital signal is illustrated in the voltage as the institute's instrumentation of the period 1 during the described instrumentation,
Described first calculating part is exported described digital signal in second round, and second round based on voltage and electric current at described period 1 institute's instrumentation, come the electric weight of described period 1 is calculated,
Described second round corresponding to the described instrumentation that is right after after the described period 1 during.
4. electrical quantity sensor as claimed in claim 2 is characterized in that,
During the described instrumentation be comprise AC wave shape a plurality of cycles during,
Described first calculating part generates reference data and differential data, and described reference data and described differential data exported as described digital signal, described reference data is the data that are illustrated in the magnitude of voltage of first cycle institute's instrumentation in described a plurality of cycle, and described differential data is the data that are illustrated in the difference between the corresponding voltage value in the magnitude of voltage of the remaining cycle institute's instrumentation in described a plurality of cycle and the described reference data.
5. electrical quantity sensor as claimed in claim 2 is characterized in that,
Described first communication control unit receives and the described relevant data of the electric weight that calculates the unit of setting up from the described unit of setting up via described first connecting portion.
6. electrical quantity sensor as claimed in claim 1 is characterized in that,
Described first communication control unit receives the data relevant with the described electric current of setting up unit institute instrumentation via described first connecting portion from the described unit of setting up.
7. as each described electrical quantity sensor in the claim 1～6, it 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 the described signal path.
8. electrical quantity sensor as claimed in claim 7 is characterized in that,
Described signal isolation portion comprises isolator.
An electrical quantity sensor set up the unit, can communicate with the described electrical quantity sensor of claim 1, and have:
Second connecting portion is used for making described set up unit and the electrical connection of described electrical quantity sensor;
The second communication control part receives described synchronizing pulse via described second connecting portion from described electrical quantity sensor;
The second electric current instrumentation portion will come the electric current that flows at the described second instrumentation object position is carried out instrumentation from the described synchronizing pulse of described second communication control part as triggering.
Electrical quantity sensor as claimed in claim 9 set up the unit, it is characterized in that,
Described second communication control part receives the digital signal of the voltage that is used for the described electrical quantity sensor of expression institute instrumentation via described second connecting portion from described electrical quantity sensor,
The described unit of setting up also has second calculating part that the electric weight to the described second instrumentation object position calculates,
Described second calculating part comes electric weight is calculated based on the electric current of described second institute of the electric current instrumentation portion instrumentation and the voltage of being represented by described digital signal.
11. electrical quantity sensor as claimed in claim 10 set up the unit, it is characterized in that,
Described digital signal is illustrated in the voltage as the institute's instrumentation of the period 1 during the described instrumentation,
Described second calculating part is based on electric current and the described digital signal of the described second electric current instrumentation portion at described period 1 institute's instrumentation, and next electric weight to the described period 1 calculates in second round,
During being the described instrumentation that is right after after the described period 1 described second round.
12. electrical quantity sensor as claimed in claim 10 set up the unit, it is characterized in that,
Described second communication control part sends the data relevant with the electric weight that described second calculating part calculates via described second connecting portion to described electrical quantity sensor.
13. electrical quantity sensor as claimed in claim 9 set up the unit, it is characterized in that,
Described second communication control part sends the data relevant with the electric current of described second institute of the electric current instrumentation portion instrumentation via described second connecting portion to described electrical quantity sensor.
14. a voltameter examining system is characterized in that,
Have:
Electrical quantity sensor carries out instrumentation to the electric current mobile at the first instrumentation object position of alternating circuit and the voltage of described alternating circuit, comes the electric weight at the described first instrumentation object position is calculated,
Set up the unit, can communicate with described electrical quantity sensor, the electric current that flows at the second instrumentation object position of described alternating circuit is carried out instrumentation;
Described electrical quantity sensor repeatedly to described set up the unit send with the instrumentation with predefined time span during the synchronizing pulse of end points synchronised,
Described set up the unit with the reception of described synchronizing pulse as triggering, come the electric current that flows at the described second instrumentation object position is carried out instrumentation.
15. voltameter examining system as claimed in claim 14 is characterized in that,
Described electrical quantity sensor generates the digital signal that is used for being illustrated in the data of the voltage of institute's instrumentation during the described instrumentation, and sends digital signal to the described unit of setting up,
The described unit of setting up comes the electric weight at the described second instrumentation object position is calculated based on the described electric current of unit institute instrumentation and the voltage of being represented by described digital signal set up.
16. voltameter examining system as claimed in claim 14 is characterized in that,
The described unit of setting up sends the data relevant with the described electric current of setting up unit institute instrumentation to described electrical quantity sensor,
Described electrical quantity sensor comes the electric weight at the described second instrumentation object position is calculated based on the described electric current of unit institute instrumentation and the voltage of described electrical quantity sensor institute instrumentation set up.
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| JP2012045511A JP6064340B2 (en) | 2012-03-01 | 2012-03-01 | Electric energy sensor and electric energy measuring system |
| JP2012-045511 | 2012-03-01 |
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| CN105319435B (en) * | 2014-06-06 | 2018-04-03 | 三菱电机株式会社 | Multi-loop electric force measuring device |
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| CN112639491A (en) * | 2018-08-14 | 2021-04-09 | 蒂科能源解决方案股份有限公司 | System and method for electric power and/or energy metering on multiple channels |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20130100687A (en) | 2013-09-11 |
| CN103293372B (en) | 2016-01-20 |
| TW201337278A (en) | 2013-09-16 |
| JP2013181813A (en) | 2013-09-12 |
| KR101424955B1 (en) | 2014-08-01 |
| JP6064340B2 (en) | 2017-01-25 |
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