CN108226657A - Judge the method with error correction for electricity load management terminal phase order of 3-phase AC - Google Patents
Judge the method with error correction for electricity load management terminal phase order of 3-phase AC Download PDFInfo
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- CN108226657A CN108226657A CN201611134464.7A CN201611134464A CN108226657A CN 108226657 A CN108226657 A CN 108226657A CN 201611134464 A CN201611134464 A CN 201611134464A CN 108226657 A CN108226657 A CN 108226657A
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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
- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The invention discloses a kind of methods for the judgement of electricity load management terminal phase order of 3-phase AC and error correction, and judging phase order and error correction are carried out to three-phase and four-line alternating current and phase three-wire three alternating current including electricity load management terminal.Main control module is by reading the angle between the phase voltage of each phase and phase current, judge phase sequence whether wrong, and the collected measurement result of plate adopts friendship according to different wrong situation notice computation chips and carries out corresponding error correction, computation chip can calculate active power and reactive power according to the phase voltage data after correction, so as to avoid economic loss caused by when the active power and reactive power that the calculating of phase sequence wrong makes mistake.
Description
Technical field
The present invention relates to the methods judged for electricity load management terminal phase order of 3-phase AC with error correction.
Background technology
Electricity load management terminal is widely used to field of electric power automation, and main function is the three-phase to scene
Alternating current measures.The three-phase alternating current power mode at scene generally has 220V three-phase and four-lines, 100V phase three-wire threes and 57.7V three-phases
Four line three types.In order to measure these three different types of three-phase alternating currents, existing electricity load management terminal is divided into
Universal electricity load management terminal and tailored version electricity load management terminal, universal electricity load management terminal can be simultaneously
Three kinds of different types of three-phase alternating currents are measured, and tailored version electricity load management terminal only measures a type of three-phase alternating current
Electricity, so as to be further divided into 220V three-phase and four-lines, 100V phase three-wire threes and 57.7V three-phase and four-line three types.
Fig. 1 shows the functional block diagram of the electricity load management terminal of existing three-phase and four-line 220V types.As shown in the figure,
The electricity load management terminal mainly includes main control module（CPU）91st, interface module 92, display module 93,94 and of communication module
Exchange acquisition module 95.Wherein, electricity load management terminal is mainly realized by exchanging acquisition module 95 to three-phase alternating current
Measurement function.Exchange acquisition module 95 includes computation chip 951, hands over and adopt plate 952 and Jiao Cai Interface Terminals row 953.Three is intersecting
Interface Terminal row 953 is adopted in the friendship of the voltage and current line access terminal of galvanic electricity, then adopts Interface Terminal row 953 by friendship and adopt plate with friendship
Connecting line between 952 enters friendship and adopts plate 952.Friendship adopts plate 952 to voltage and current processing, is converted into the analog quantity that can be measured
Signal, analog signals are sent to computation chip 951, meanwhile, friendship is adopted plate 952 and is provided measured by itself to computation chip 951
Alternating current type information.Hand over adopt plate 952 include respectively measure A, B, C three-phase bus voltage three voltage collection circuits 9521,
The current collection circuit 9522 of A, B, C three-phase bus electric current and alternating current type decision circuitry 9523 are measured respectively.Metering core
Piece 951 reads the analog signals handed over and adopt plate transmission, and each mutually electricity of three-phase alternating current is calculated according to the corresponding program in chip
The data such as pressure, electric current, active power, reactive power, electricity and phase angle, computation chip 951 can read friendship and adopt the offer of plate 952
Three-phase alternating current type information selects corresponding calculation.Three-phase alternating current type information is by alternating current type decision circuitry
9523 provide, and alternating current type decision circuitry 9523 is notified that the friendship of computation chip 951 adopts the alternating current type that plate currently measures and is
It is any in 220V three-phase and four-lines, 100V phase three-wire threes and 57.7V three-phase and four-lines.For universal management of power load end
End, 100V phase three-wire threes and 57.7V three-phase and four-lines electricity load management terminal for, form substantially also with Fig. 1 substantially
It is identical, it is only different in terms of friendship adopts Interface Terminal row, hands over the internal processes for adopting plate and computation chip.
The voltage and current line of A, B, C three-phase must correspond to the corresponding interface of access terminal during field connection, if scene connects
Voltage and current line access incorrect order occurs during line, active power, reactive power numerical value are different from actual value it will cause measuring, to life
Production, life cause economic loss.Fig. 2 shows ideally（Without capacitive, inductive load, in-phase voltage electric current angle is 0,
Power factor is 1）The phase diagram of three-phase alternating current.Wherein advanced 120 ° of the B phases of A phases, advanced 120 ° of the C phases of B phases.If during field connection
During the problem of phase sequence wrong occurs, for example, three-phase alternating current A phase voltage line access terminal B phases, B phase voltage line access terminal C phases,
C phase voltage line access terminal A phases, then the phase diagram meeting for the three-phase alternating current that terminal measurement obtains is as shown in figure 3, each phase current meeting
120 ° of lagging voltage, then it is different from actual value to measure active power, reactive power numerical value, and production, life can be given to cause economic damage
It loses.
Invention content
The technical problems to be solved by the invention are to provide a kind of for electricity load management terminal three-phase alternating current phase
Sequence judges the method with error correction, and whether each phase phase sequence of three-phase alternating current that can judge to access electricity load management terminal occurs
Mistake, and error correction is carried out to measurement result when incorrect order occurs.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of method judged for electricity load management terminal phase order of 3-phase AC with error correction, feature is, including electricity
Power load management terminal carries out judging phase order and error correction to three-phase and four-line alternating current, and the electricity load management terminal is to three-phase
Four line alternating currents carry out judging phase order and include the following steps with error correction：
The main control module of electricity load management terminal reads angle Φ A between A phase voltages and A phase currents, B phases from computation chip
The angle Φ C between angle Φ B and C phase voltage and C phase currents between voltage and B phase currents judge whether are Φ A, Φ B and Φ C
Meet more than or equal to -50 ° and less than or equal to+50 °；
If Φ A, Φ B and Φ C are satisfied by being more than or equal to -50 ° and less than or equal to+50 °, the master control module judges power load
The phase sequence access of lotus management terminal is correct；
If arbitrary the two in Φ A, Φ B and Φ C is unsatisfactory for being more than or equal to -50 ° and less than or equal to+50 °, the master control mould
Block judges the two-phase phase sequence access mistake of electricity load management terminal, and notifies friendship of the computation chip by electricity load management terminal
The voltage data for adopting the collected two-phase of plate is exchanged；
If Φ A, Φ B and Φ C are unsatisfactory for being more than or equal to -50 ° and less than or equal to+50 °, the master control module judges electric power
The three-phase phase-sequence access mistake of load management terminal, and further judge the three-phase and four-line exchange of access electricity load management terminal
Electricity is positive sequence or backward, if the phase angle difference Φ U of A phase voltages and B phase voltagesABIt is+120 °, then judges that three-phase and four-line is handed over
Galvanic electricity is positive sequence, if the phase angle difference Φ U of A phase voltages and B phase voltagesABIt is -120 °, then judges that three-phase and four-line alternating current is
Backward；
If three-phase and four-line alternating current is positive sequence, and Φ A, Φ B and Φ C are satisfied by being more than or equal to -170 ° and less than or equal to -70 °,
Either three-phase and four-line alternating current is backward, and Φ A, Φ B and Φ C are satisfied by being more than or equal to+70 ° and less than or equal to+170 °, then
The friendship of electricity load management terminal is adopted the collected A phase voltages data of plate as B phase voltages by main control module notice computation chip
Data, B phase voltages data are as C phase voltage data, and C phase voltages data are as A phase voltage data；
If three-phase and four-line alternating current is backward, and Φ A, Φ B and Φ C are satisfied by being more than or equal to -170 ° and less than or equal to -70 °,
Either three-phase and four-line alternating current is positive sequence, and Φ A, Φ B and Φ C are satisfied by being more than or equal to+70 ° and less than or equal to+170 °, then
The friendship of electricity load management terminal is adopted the collected A phase voltages data of plate as C phase voltages by main control module notice computation chip
Data, B phase voltages data are as A phase voltage data, and C phase voltages data are as B phase voltage data.
After adopting the above technical scheme, the present invention has at least the following advantages and feature：
According to embodiments of the present invention judges that the method with error correction can for electricity load management terminal phase order of 3-phase AC
Judge whether each phase phase sequence of three-phase alternating current for accessing electricity load management terminal occurs mistake, and meter is notified when incorrect order occurs
Amount chip adopts friendship the collected measurement result of plate and carries out error correction, and computation chip can be calculated according to the phase voltage data after correction to be had
Work(power and reactive power, so as to avoid because phase sequence wrong calculating make mistake active power and reactive power due to caused by pass through
Ji loss.
Description of the drawings
Fig. 1 shows the functional block diagram of the existing electricity load management terminal for measuring 220V three-phase and four-line alternating currents.
Fig. 2 shows the phase diagrams of ideally three-phase alternating current.
Fig. 3 shows the phase diagram of the three-phase alternating current under phase sequence wrong state.
Fig. 4 show it is according to an embodiment of the invention for electricity load management terminal phase order of 3-phase AC judge with
The method of error correction carries out judging phase order and the flow diagram of error correction to three-phase and four-line alternating current.
Fig. 5 and Fig. 6 respectively illustrates positive sequence three-phase and four-line alternating current and the friendship of backward three-phase and four-line under phase sequence wrong state
The phase diagram of galvanic electricity.
Fig. 7 show it is according to an embodiment of the invention for electricity load management terminal phase order of 3-phase AC judge with
The method of error correction carries out judging phase order and the flow diagram of error correction to phase three-wire three alternating current.
Fig. 8 shows the phase diagram of phase three-wire three alternating current.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Please refer to Fig. 4.It is according to an embodiment of the invention a kind of for electricity load management terminal phase order of 3-phase AC
Judge the method with error correction, judging phase order and error correction are carried out to three-phase and four-line alternating current including electricity load management terminal, it is described
Electricity load management terminal to three-phase and four-line alternating current carry out judging phase order include the following steps with error correction：
Step a, the main control module of electricity load management terminal reads the angle between A phase voltages and A phase currents from computation chip
The angle Φ C between angle Φ B and C phase voltage and C phase currents between Φ A, B phase voltages and B phase currents, judge Φ A, Φ B and
Whether Φ C meet more than or equal to -50 ° and less than or equal to+50 °.
Step b, if Φ A, Φ B and Φ C are satisfied by being more than or equal to -50 ° and less than or equal to+50 °, master control module judges
The phase sequence access of electricity load management terminal is correct.In three-phase and four-line exchanges electrical measurement, because live three-phase alternating current is each
Phase power factor actual requirement is more than 0.7, and power factor is equal to the cosine value at phase angle, if it can be considered that when measuring
Each phase phase sequence is errorless, then the angle between the phase voltage of each phase and phase current should be between -50 ° to+50 °.Three-phase alternating current
Each phase voltage between angle be 120 °, the phase sequence on the basis of the phase sequence of phase current, if voltage phase sequence occur incorrect order, mutually electricity
Press phase current between angle should between -170 ° to -70 ° either+70 ° to+170 °,
If arbitrary the two step c, in Φ A, Φ B and Φ C is unsatisfactory for being more than or equal to -50 ° and less than or equal to+50 °, master control
Module judges the two-phase phase sequence access mistake of electricity load management terminal, and notifies computation chip by electricity load management terminal
The voltage data for adopting the collected two-phase of plate is handed over to be exchanged.For example, if Φ A, Φ B are unsatisfactory for being more than or equal to -50 ° and small
In equal to+50 °, then the phase sequence of the A phases of master control module judges electricity load management terminal and B phases access mistake, is notified that metering
Friendship is adopted the collected A phase voltages data of plate as B phase voltage data by chip, B phase voltages data as A phase voltage data, this
If sample, computation chip can be adopted the collected A phase currents of plate and B phase voltages using friendship as multiplier and go to calculate the active of A phase voltages
Power and reactive power adopt the collected B phase currents of plate and A phase voltages as multiplier using friendship and go to calculate the wattful power of B phase voltages
Rate and reactive power, so as to avoid the problem that the active power brought by phase sequence wrong and wattless power meter calculate mistake.
If step d, Φ A, Φ B and Φ C are unsatisfactory for being more than or equal to -50 ° and less than or equal to+50 °, main control module is sentenced
The three-phase phase-sequence access mistake of disconnected electricity load management terminal, and further judge the three-phase four of access electricity load management terminal
Line alternating current is positive sequence or backward, if the phase angle difference Φ U of A phase voltages and B phase voltagesABIt is+120 °, then judges three-phase
Four line alternating currents are positive sequence, if the phase angle difference Φ U of A phase voltages and B phase voltagesABIt is -120 °, then judges that three-phase and four-line is handed over
Galvanic electricity is backward.That is, it is judged as positive sequence if 120 ° of advanced B phase voltages of A phase voltages, if A phase voltages lag B phase voltages
120 ° are then judged as backward.Fig. 5 and Fig. 6 respectively illustrates positive sequence three-phase and four-line alternating current and backward three under phase sequence wrong state
The phase diagram of four line alternating current of phase.
If step e, three-phase and four-line alternating current is positive sequence, and Φ A, Φ B and Φ C are satisfied by being more than or equal to -170 ° and small
In equal to -70 ° or three-phase and four-line alternating current is backward, and Φ A, Φ B and Φ C are satisfied by being more than or equal to and+70 ° and be less than
Equal to+170 °, then the friendship of electricity load management terminal is adopted the collected A phase voltages data of plate by main control module notice computation chip
As B phase voltage data, for B phase voltages data as C phase voltage data, C phase voltages data are such as A phase voltage data
Words, computation chip can with after correction A phases, the voltage data of B phases and C phases calculate active power and reactive power, so as to avoid
Economic loss caused by due to the active power and reactive power that the calculating of phase sequence wrong makes mistake.
If step f, three-phase and four-line alternating current is backward, and Φ A, Φ B and Φ C are satisfied by being more than or equal to -170 ° and small
In equal to -70 ° or three-phase and four-line alternating current is positive sequence, and Φ A, Φ B and Φ C are satisfied by being more than or equal to and+70 ° and be less than
Equal to+170 °, then the friendship of electricity load management terminal is adopted the collected A phase voltages data of plate by main control module notice computation chip
As C phase voltage data, B phase voltages data are as A phase voltage data, and C phase voltages data are as B phase voltage data.
Please refer to Fig. 7 and Fig. 8.It is according to an embodiment of the invention a kind of for electricity load management terminal three-phase alternating current
Judging phase order and the method for error correction further include electricity load management terminal and judging phase order are carried out to phase three-wire three alternating current with entangling
Mistake, the electricity load management terminal carry out judging phase order to phase three-wire three alternating current and include the following steps with error correction：
Step g, the main control module of electricity load management terminal reads the angle between A phase voltages and A phase currents from computation chip
Angle Φ C between Φ A and C phase voltage and C phase currents, and the difference Δ AC of Φ A and Φ C are calculated, Δ AC=Φ A- Φ C.
Step h, whether master control module judges Δ AC meets -70 °≤Δ AC≤- 50 ° or+50 °≤Δ AC≤+ 70 °.
Step i, if Δ AC meets -70 °≤Δ AC≤- 50 ° or+50 °≤Δ AC≤+ 70 °, master control module judges electricity
The phase sequence access of power load management terminal is correct.In phase three-wire three exchanges electrical measurement, because B phases access public phase N phases, therefore
Actually measured A, C phase voltage line voltage between line voltage and CB between AB, therefore the angle Φ U between A, C phase voltage measuredAC
It is -60 °（Positive sequence）Or+60 °（Backward）.Again because three-phase three-wire system circuit does not have adjustment capability, live three-phase load is put down substantially
Weighing apparatus, therefore the angle Φ I between A, C phase currentACAbout -120 °（Positive sequence）Or+120 °（Backward）.Therefore Φ A- Φ C=Φ UAC–
ΦIAC=+60°（Positive sequence）Or -60 °（Backward）.The Φ U if incorrect order occurs for voltageCA–ΦIAC==+ 180 ° or -180 °.Therefore, exist
In the case of measurement error, calculate Φ A- Φ C, if result between+50 ° to+70 ° or -70 ° to -50 °, phase
Sequence is correct；Otherwise phase sequence mistake.
Step j, if Δ AC is unsatisfactory for -70 °≤Δ AC≤- 50 ° and+50 °≤Δ AC≤+ 70 °, master control module judges
The phase sequence access mistake of electricity load management terminal, and notify computation chip that the friendship of electricity load management terminal is adopted plate and is collected
A phase voltages data exchanged with C phase voltage data, computation chip can using hand over adopt the collected C phase voltages data of plate as A
Phase voltage data adopt the collected A phase voltages data of plate as C phase voltage data, and with the A phases after correction and C phases to hand over
Voltage data calculates active power and reactive power.
In the present embodiment, above-mentioned main control module is the CPU of electricity load management terminal.The present invention can pass through software
Mode is realized.
Claims (3)
- A kind of 1. method judged for electricity load management terminal phase order of 3-phase AC with error correction, which is characterized in that including Electricity load management terminal carries out judging phase order and error correction to three-phase and four-line alternating current, and the electricity load management terminal is to three Four line alternating current of phase carries out judging phase order and includes the following steps with error correction：The main control module of electricity load management terminal reads angle Φ A between A phase voltages and A phase currents, B phases from computation chip The angle Φ C between angle Φ B and C phase voltage and C phase currents between voltage and B phase currents judge whether are Φ A, Φ B and Φ C Meet more than or equal to -50 ° and less than or equal to+50 °；If Φ A, Φ B and Φ C are satisfied by being more than or equal to -50 ° and less than or equal to+50 °, the master control module judges power load The phase sequence access of lotus management terminal is correct；If arbitrary the two in Φ A, Φ B and Φ C is unsatisfactory for being more than or equal to -50 ° and less than or equal to+50 °, the master control mould Block judges the two-phase phase sequence access mistake of electricity load management terminal, and notifies friendship of the computation chip by electricity load management terminal The voltage data for adopting the collected two-phase of plate is exchanged；If Φ A, Φ B and Φ C are unsatisfactory for being more than or equal to -50 ° and less than or equal to+50 °, the master control module judges electric power The three-phase phase-sequence access mistake of load management terminal, and further judge the three-phase and four-line exchange of access electricity load management terminal Electricity is positive sequence or backward, if the phase angle difference Φ U of A phase voltages and B phase voltagesABIt is+120 °, then judges that three-phase and four-line is handed over Galvanic electricity is positive sequence, if the phase angle difference Φ U of A phase voltages and B phase voltagesABIt is -120 °, then judges that three-phase and four-line alternating current is Backward；If three-phase and four-line alternating current is positive sequence, and Φ A, Φ B and Φ C are satisfied by being more than or equal to -170 ° and less than or equal to -70 °, Either three-phase and four-line alternating current is backward, and Φ A, Φ B and Φ C are satisfied by being more than or equal to+70 ° and less than or equal to+170 °, then The friendship of electricity load management terminal is adopted the collected A phase voltages data of plate as B phase voltages by main control module notice computation chip Data, B phase voltages data are as C phase voltage data, and C phase voltages data are as A phase voltage data；If three-phase and four-line alternating current is backward, and Φ A, Φ B and Φ C are satisfied by being more than or equal to -170 ° and less than or equal to -70 °, Either three-phase and four-line alternating current is positive sequence, and Φ A, Φ B and Φ C are satisfied by being more than or equal to+70 ° and less than or equal to+170 °, then The friendship of electricity load management terminal is adopted the collected A phase voltages data of plate as C phase voltages by main control module notice computation chip Data, B phase voltages data are as A phase voltage data, and C phase voltages data are as B phase voltage data.
- 2. the method according to claim 1 judged for electricity load management terminal phase order of 3-phase AC with error correction, It is characterised in that it includes electricity load management terminal carries out judging phase order and error correction, the electric power to phase three-wire three alternating current Load management terminal carries out judging phase order to phase three-wire three alternating current and includes the following steps with error correction：The main control module of electricity load management terminal read from computation chip angle Φ A between A phase voltages and A phase currents and Angle Φ C between C phase voltages and C phase currents, and calculate the difference Δ AC of Φ A and Φ C；Whether the master control module judges Δ AC meets -70 °≤Δ AC≤- 50 ° or+50 °≤Δ AC≤+ 70 °；If Δ AC meets -70 °≤Δ AC≤- 50 ° or+50 °≤Δ AC≤+ 70 °, the master control module judges management of power load The phase sequence access of terminal is correct；If Δ AC is unsatisfactory for -70 °≤Δ AC≤- 50 ° and+50 °≤Δ AC≤+ 70 °, master control module judges electric load pipe The phase sequence access mistake of terminal is managed, and notifies computation chip that the friendship of electricity load management terminal is adopted the collected A phase voltages of plate Data are exchanged with C phase voltage data.
- 3. the side according to claim 1 or 2 judged for electricity load management terminal phase order of 3-phase AC with error correction Method, which is characterized in that the main control module is the CPU of the electricity load management terminal.
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Cited By (5)
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| CN110806556A (en) * | 2019-10-24 | 2020-02-18 | 国网四川省电力公司成都供电公司 | Metering abnormity on-line monitoring method and system and readable storage medium |
| CN111060754A (en) * | 2019-12-31 | 2020-04-24 | 南京新联智慧能源服务有限公司 | Electric energy information acquisition terminal with automatic phase sequence identification function and automatic phase sequence identification method |
| CN111239651A (en) * | 2020-02-28 | 2020-06-05 | 四川万益能源科技有限公司 | Power instrument wiring fault detection method suitable for reactive compensation power distribution room |
| CN111426877A (en) * | 2020-06-11 | 2020-07-17 | 四川明星电力股份有限公司 | Method and system for checking power protection device |
| CN111983335A (en) * | 2020-09-01 | 2020-11-24 | 山东博奥斯能源科技有限公司 | Phase sequence detection method based on orthogonal area |
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