CN106843020A - Universal electricity load management terminal - Google Patents
Universal electricity load management terminal Download PDFInfo
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- CN106843020A CN106843020A CN201510877298.9A CN201510877298A CN106843020A CN 106843020 A CN106843020 A CN 106843020A CN 201510877298 A CN201510877298 A CN 201510877298A CN 106843020 A CN106843020 A CN 106843020A
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- 230000005611 electricity Effects 0.000 title claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000004804 winding Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 11
- 230000005612 types of electricity Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2656—Instrumentation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measurement Of Current Or Voltage (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
Plate and Jiao Cai Interface Terminals row are adopted the invention discloses universal electricity load management terminal, including computation chip, friendship.Wherein, plate is adopted in friendship and Jiao Cai Interface Terminals row is respectively provided with A, B, C and N phase voltage binding post；Exchange acquisition module is connected wiring including A, B, C with N.One end of B phases and the connected wiring of N is connected with the B phases and N phase voltage binding posts of adopting Interface Terminal row is handed over respectively, the other end of the connected wiring of B can be detachably connected with the B phase voltages binding post or N phase voltage binding posts that adopt plate is handed over, and the other end of the connected wiring of N can be detachably connected with the N phase voltage binding posts that adopt plate are handed over.The resistance of three sample resistances of voltage sampling circuit that plate is adopted in friendship is equal；Computation chip is used to calculate three-phase bus magnitude of voltage respectively according to three outputs of voltage sampling circuit, and judges the alternating current type of measured three-phase bus according to any one phase bus voltage value for calculating.Three-phase alternating current electrical measurement of the present invention suitable for three types.
Description
Technical field
The present invention relates to electricity load management terminal.
Background technology
Electricity load management terminal is widely used to field of electric power automation, and one of its main function is that the three-phase alternating current at scene is measured.The three-phase alternating current power mode at scene typically has 220V three-phase and four-lines, 100V phase three-wire threes and 57.7V three-phase and four-line three types.In order to measure these three different types of three-phase alternating currents, existing electricity load management terminal has been also divided into 220V three-phase and four-lines, 100V phase three-wire threes and 57.7V three-phase and four-line three types, and is measured using three kinds of different methods respectively.
Fig. 1 shows the theory diagram of the electricity load management terminal of existing three-phase and four-line 220V types.As illustrated, the electricity load management terminal mainly includes CPU91, interface module 92, display module 93, communication module 94 and exchanges acquisition module 95.Wherein, electricity load management terminal mainly realizes the measurement function to three-phase alternating current by exchanging acquisition module 95.Exchange acquisition module 95 includes that computation chip 951, friendship adopt plate 952 and Jiao Cai Interface Terminals row 953.Interface Terminal row 953 is adopted in the friendship of the voltage x current line access terminal of three-phase alternating current, then adopts the connecting line between plate 952 and adopt plate 952 into friendship by handing over to adopt Interface Terminal and arrange 953 and hand over.Friendship adopts plate 952 to voltage x current treatment, is converted into the measured analog signalses of energy, and analog signalses are sent to computation chip 951, meanwhile, friendship adopts plate 952 to the alternating current type information measured by the offer of computation chip 951 itself.Plate 952 is adopted in friendship to be included measuring three voltage collection circuits 9521 of A, B, C three-phase bus voltage respectively, measures the current collection circuit 9522 and alternating current type decision circuitry 9523 of A, B, C three-phase bus electric current respectively.Computation chip 951 reads the analog signalses handed over and adopt plate transmission, the data such as each phase voltage, electric current, active power, reactive power, electricity and the phase angle of three-phase alternating current are calculated according to the corresponding program in chip, computation chip 951 can read the three-phase alternating current type information handed over and adopt the offer of plate 952, select corresponding calculation.
For the electricity load management terminal of 100V phase three-wire threes and 57.7V three-phase and four-lines, it constitutes also roughly the same with Fig. 1 substantially, but the friendship for being used adopts Interface Terminal row, hand over that to adopt plate and the internal processes of computation chip be different, and its difference is mainly reflected in the following aspects：
1st, hand over the pressure-wire mode of connection for adopting plate different.For the electricity load management terminal of measurement 57.7V three-phase and four-lines and 220V three-phase and four-lines, friendship is adopted the voltage wiring terminal of Interface Terminal row and is one-to-one annexation between the voltage wiring terminal of plate is adopted in friendship, hand over the A phase voltage binding posts for adopting Interface Terminal row, B phase voltage binding posts, C phase voltages binding post and N phase voltages binding post are connected wiring by A respectively, B is connected wiring, the A phase voltage binding posts of plate are adopted in the connected wiring of C and the connected wiring of N with friendship correspondingly, B phase voltage binding posts, C phase voltages binding post is fixedly connected with N phase voltage binding posts（Typically it is welded to connect）.And in the electricity load management terminal for measuring 100V phase three-wire threes, friendship is adopted terminal interface row and is not provided with N phase voltage binding posts, the B phase voltages binding post that Interface Terminal row is adopted in friendship is fixedly connected by the connected wiring of B（Typically it is welded to connect）On the N phase voltage binding posts for adopting plate to friendship.
2nd, hand over the resistance of the sample resistance of the voltage collection circuit adopted in plate different.Three voltage collection circuits being provided with plate for measuring A, B, C three-phase bus voltage respectively are adopted in friendship, and the structure of three voltage collection circuits is identical.For three kinds of different types of electricity load management terminals, although the structure of the voltage collection circuit between them is also identical, but the resistance of the sample resistance in voltage collection circuit is different.Fig. 2 shows three kinds of circuit theory diagrams of the voltage collection circuit of different types of electricity load management terminal.The voltage collection circuit includes voltage transformer T1, sample resistance R and protection circuit 955.Voltage wiring terminal connection corresponding on plate is adopted in one end of sample resistance R with friendship, and the other end of sample resistance R is connected with one end of the first winding of voltage transformer T1.The other end of the first winding of voltage transformer T1 adopts the N phases on plate with friendship（It is public）Voltage wiring terminal is connected.The Secondary Winding of voltage transformer T1 is connected with the input of protection circuit 955.Protection circuit 955 is made up of two diodes V1, V2 of parallel connected in reverse phase, and the output end of protection circuit 955 is connected to computation chip.
Value respectively 220K, 100K and 57.7K of the sample resistance R of plate is adopted in the friendship of common three-phase and four-line 220V, phase three-wire three 100V and three-phase and four-line 57.7V.If the three-phase alternating current piezoelectric voltage of scene 220V, 100V and 57.7V three types is 100% range, magnitude of voltage is by the current value after sample resistance R when maximum：
.In three kinds of different types of electricity load management terminals, when computation chip reads 1.414mA, different computing formula are taken respectively, calculate the instantaneous voltage value of 220V, 100V and 57.7V.
3rd, hand over the alternating current type decision circuitry adopted on plate different.As shown in figure 3, in the electricity load management terminal of original three types, the friendship of measurement 100V phase three-wire threes is adopted and be provided with plate resistance R102, R103 is fitted without, resistance R102 and resistance R103 is also show for the sake of Fig. 3 is used for the purpose of simplifying.The friendship of measurement 57.7V three-phase and four-lines is adopted and be provided with plate resistance R103, is fitted without resistance R102, and the friendship of measurement 220V three-phase and four-lines is adopted and resistance R103 had both been fitted without on plate, is also fitted without resistance R102.When resistance R102 or R103 is loaded onto, correspondence signal ground, it is " 0 " to be worth；When not filling resistance R102 or R103, induction signal is drawn high by computation chip peripheral circuit, it is " 1 " to be worth.Computation chip judge to hand over as the value of " MODE0 " and " MODE1 " that reads adopt plate and its measured by three-phase alternating current type, will determine that result notifies the CPU of electricity load management terminal.
By the above as can be seen that the electricity load management terminal of existing a certain type can only measure the three-phase alternating current of same type, and other types of three-phase alternating current cannot be measured.Therefore existing electricity load management terminal does not have versatility, it is impossible to meet the increasingly complicated demand in scene.Meanwhile, in process of producing product, the type of electricity load management terminal is just can determine that after the concrete configuration requirement that only specify that Utilities Electric Co., therefore production stock cannot be in advance carried out, the production cycle is extended, virtually also increase production cost.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of versatility good electricity load management terminal, and it can be applied to 220V three-phase and four-lines, 100V phase three-wire threes, the three-phase alternating current electrical measurement of 57.7V three-phase and four-lines.
In order to solve the above technical problems, the technical solution used in the present invention is：
Universal electricity load management terminal, including exchange acquisition module, the exchange acquisition module include that computation chip, friendship adopt plate and Jiao Cai Interface Terminals row；Plate is adopted in friendship includes measuring respectively three voltage collection circuits of three-phase bus voltage, each voltage collection circuit includes voltage transformer and sample resistance, voltage wiring terminal corresponding on plate is adopted with friendship and connected in one end of sample resistance, the other end of sample resistance is connected with one end of the first winding of voltage transformer, and the other end of the first winding of voltage transformer is adopted the N phase voltage binding posts on plate and is connected with friendship；Its feature is that plate is adopted in friendship and Jiao Cai Interface Terminals row is respectively provided with A phase voltages binding post, B phase voltages binding post, C phase voltages binding post and N phase voltage binding posts；Exchange acquisition module includes that A wiring, B wiring, the C wiring that is connected that is connected that is connected is connected wiring with N；The two ends of the connected wiring of A are connected with the A phase voltage binding posts for adopting plate and Jiao Cai Interface Terminals row are handed over respectively, the two ends of the connected wiring of C are connected with the C phase voltage binding posts for adopting plate and Jiao Cai Interface Terminals row are handed over respectively, the B phase voltage binding posts that Interface Terminal row is adopted in one end of the connected wiring of B and friendship are connected, the other end of the connected wiring of B can be detachably connected with the B phase voltages binding post or N phase voltage binding posts that plate is adopted in friendship, the N phase voltage binding posts that Interface Terminal row is adopted in one end of the connected wiring of N and friendship are connected, the other end of the connected wiring of N can be detachably connected with the N phase voltage binding posts that plate is adopted in friendship；The resistance of three sample resistances of voltage sampling circuit is equal；Computation chip is used to calculate three-phase bus magnitude of voltage respectively according to three outputs of voltage sampling circuit, and judges the alternating current type of measured three-phase bus according to any one phase bus voltage value for calculating.
Because invention employs the technical scheme of the above, its three-phase alternating current electrical measurement that can be applied to 220V three-phase and four-lines, 100V phase three-wire threes, 57.7V three-phase and four-lines these three types so as to facilitate the operation of survey crew, and can reduce the cost of production.
Brief description of the drawings
Fig. 1 is the theory diagram of the electricity load management terminal of existing measurement 220V three-phase and four-line alternating currents.
Fig. 2 shows three kinds of circuit theory diagrams of the voltage collection circuit of different types of electricity load management terminal.
Fig. 3 shows that the schematic diagram of the alternating current type decision circuitry of plate is adopted in the friendship of three kinds of different types of electricity load management terminals.
Fig. 4 shows the theory diagram of electricity load management terminal according to an embodiment of the invention.
Fig. 5 to show and adopt wiring diagram of the plate when 57.7V three-phase and four-lines and 220V three-phase and four-line alternating currents is measured according to the friendship of one embodiment of invention.
Fig. 6 to show and adopt wiring diagram of the plate when 100V phase three-wire three alternating currents are measured according to the friendship of one embodiment of invention.
Fig. 7 shows the circuit theory diagrams of the voltage collection circuit of the electricity load management terminal according to one embodiment of invention.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Fig. 4 shows the theory diagram of the universal electricity load management terminal according to one embodiment of invention.The universal electricity load management terminal includes CPU1, interface module 2, display module 3, communication module 4 and exchanges acquisition module 5.Wherein, exchange acquisition module 5 includes that computation chip 51, friendship adopt plate 52 and Jiao Cai Interface Terminals row 53.Interface Terminal row 53 is adopted in the friendship of the voltage x current line access terminal of three-phase alternating current, then adopts the connecting line between plate 52 and adopt plate 52 into friendship by handing over to adopt Interface Terminal and arrange 53 and hand over.Incorporated by reference to shown in Fig. 5.In the present embodiment, plate 52 is adopted in friendship and Jiao Cai Interface Terminals row 53 is respectively provided with A phase voltages binding post, B phase voltages binding post, C phase voltages binding post and N phase voltage binding posts；Exchange acquisition module includes that A wiring 61, B wiring 62, the C wiring 63 that is connected that is connected that is connected is connected wiring 64 with N.The two ends of the connected wiring 61 of A are connected with the A phase voltage binding posts for adopting plate and Jiao Cai Interface Terminals row are handed over respectively, the two ends of the connected wiring 63 of C are connected with the C phase voltage binding posts for adopting plate and Jiao Cai Interface Terminals row are handed over respectively, the B phase voltage binding posts that Interface Terminal row is adopted in one end of the connected wiring 62 of B and friendship are connected, the other end of the connected wiring of B can be detachably connected with the B phase voltages binding post 57 or N phase voltages binding post 58 that plate is adopted in friendship, the N phase voltage binding posts that Interface Terminal row is adopted in one end of the connected wiring 64 of N and friendship are connected, the other end of the connected wiring 64 of N can be detachably connected with the N phase voltages binding post 58 that plate is adopted in friendship.The above-mentioned mode the being detachably connected including but not limited to mode such as bolt wiring.Figure 5 illustrates be invention friendships adopt plate measurement 57.7V three-phase and four-lines and 220V three-phase and four-line alternating currents when wiring diagram, wherein, the other end of the connected wiring 62 of B and the connected wiring 64 of N is connected with the B phase voltages binding post 57 and N phase voltages binding post 58 of adopting plate is handed over respectively.When the friendship adopts plate when 100V phase three-wire three alternating currents are measured, the connected wiring 64 of N need to only be taken away, the other end of the connected wiring 62 of B is connected with the N phase voltages binding post 58 for adopting plate is handed over, as shown in Figure 6.
Plate 52 is adopted in friendship according to an embodiment of the invention to be included three voltage collection circuits 521 of measurement A, B, C three-phase bus voltage respectively and measures three current collection circuits 522 of A, B, C three-phase current respectively（For simplicity, a voltage collection circuit 521 and a current collection circuit 522 are illustrate only in figure）.The structure of voltage collection circuit 521 is as shown in Figure 7, including voltage transformer T1 and sample resistance R ', voltage wiring terminal corresponding on plate is adopted with friendship and connected in one end of sample resistance R ', the other end of sample resistance R ' is connected with one end of the first winding of voltage transformer T1, and the other end of the first winding of voltage transformer T1 is adopted the N phase voltage binding posts on plate and is connected with friendship.The Secondary Winding of voltage transformer T1 is connected with the input of protection circuit 55.Protection circuit 55 is made up of two diodes V1, V2 of parallel connected in reverse phase, and the output end of protection circuit 55 is connected to computation chip.
In the present embodiment, in order to realize the versatility of product, the resistance of three sample resistance R ' of voltage sampling circuit 521 is equal, and more than or equal to 220K.In view of factors such as precision, the resistance of sample resistance R ' is preferably 220K.Computation chip 51 is used to calculate three-phase bus magnitude of voltage respectively according to three outputs of voltage sampling circuit.What is no matter calculated is the alternating current electrical parameter of which kind, and computation chip 51 uses consistent electrical parameter computing formula.Above-mentioned electrical parameter is including phase voltage, phase current, phase angle, active power, reactive power, electricity etc..
When the resistance of three sample resistance R ' of voltage sampling circuit 521 is set into 220K, if setting live 220V, the three-phase alternating current piezoelectric voltage of 100V and 57.7V three types is all 100% range, and magnitude of voltage is respectively when maximum by the current value after sample resistance：
Understand the Ratio invariableness of current value and alternating current voltage after the conversion, as ratio when three-phase and four-line 220V alternating currents are measured in existing power load terminal, therefore electrical parameter computing formula in the present embodiment is the electrical parameter computing formula that the electricity load management terminal of existing measurement three-phase and four-line 220V types is used.On the other hand, when the electricity load management terminal of the present embodiment measures the alternating current of 100V phase three-wire threes and 57.7V three-phase and four-lines, crest voltage is respectively 0.643mA and 0.371mA by the current value after sample resistance, current value is too small, the range of computation chip can not be made full use of, measurement error may be brought.To reduce error during voltage sample, sample resistance R ' preferably uses 0.1% precision, the precision resister of 15ppm temperature drifts.
By taking the computation chip of model 71M6513 as an example, when the resistance of sample resistance R ' is 220K, no matter electricity load management terminal measurement be which type alternating current, the phase voltage calculation formula that computation chip is used is：
Ux=（VxSQSUM*LSB*3600*Fs/Nacc）1/2
Wherein VxSQSUM is the quadratic sum of computation chip each phase voltage sampling in a upper integration periods, is computation chip automatic data acquisition and calculation；Fs=2520.62Hz, is the sample frequency of computation chip；Nacc is a sampling number for integration periods, and actual value is by being artificially previously set；LSB= 9.4045*10-13*VMAX2
（Unit is：V2h ）.VMAX is the voltage effective value that corresponding outside three-phase alternating current applies when the voltage that computation chip collects voltage input end is 250mVp-p.Above-mentioned formula is also the phase voltage calculation formula of the computation chip of the model 71M6513 in the electricity load management terminal of existing measurement 220V three-phase and four-line alternating currents.Correspondingly, computation chip 51 calculate other electrical parameters computing formula use be also existing measurement 220V three-phase and four-line alternating currents electricity load management terminal in model 71M6513 computation chip electrical parameter computing formula.
Additionally, in order to realize handing over the versatility for adopting plate, friendship is adopted the alternating current type decision circuitry before plate 52 is eliminated, the type information for surveying three-phase alternating current is no longer provided to computation chip 51, changes and judge three-phase alternating current type information by computation chip 51.In a more detailed implementation method, computation chip 51 is used in the foregoing any one phase bus voltage value for calculating more than 0V and during less than or equal to 75V, the alternating current type for judging measured three-phase bus is 57.7V three-phase and four-lines, in any one phase bus voltage value for calculating more than 75V and during less than or equal to 150V, the alternating current type for judging measured three-phase bus is 100V phase three-wire threes, in any one phase bus voltage value for calculating more than 150V and during less than or equal to 300V, the alternating current type for judging measured three-phase bus is 220V three-phase and four-lines.
Above description is to further illustrating that the present invention is done with reference to specific embodiment and accompanying drawing.But; the present invention obviously can be implemented in various other methods described different from this; those skilled in the art can be promoted according to actually used situation in the case of without prejudice to present invention, be deduced; therefore, the content of above-mentioned specific embodiment should not limit present invention determine that protection domain.
Claims (4)
1. universal electricity load management terminal, including exchange acquisition module, described exchange acquisition module includes that computation chip, friendship adopt plate and Jiao Cai Interface Terminals row；Plate is adopted in the friendship includes measuring respectively three voltage collection circuits of three-phase bus voltage, each voltage collection circuit includes voltage transformer and sample resistance, voltage wiring terminal corresponding on plate is adopted with friendship and connected in one end of the sample resistance, the other end of sample resistance is connected with one end of the first winding of the voltage transformer, and the other end of the first winding of the voltage transformer is adopted the N phase voltage binding posts on plate and is connected with friendship；Characterized in that, plate is adopted in described friendship and Jiao Cai Interface Terminals row is respectively provided with A phase voltages binding post, B phase voltages binding post, C phase voltages binding post and N phase voltage binding posts；Described exchange acquisition module includes that A wiring, B wiring, the C wiring that is connected that is connected that is connected is connected wiring with N；
The two ends of the connected wiring of the A are connected with the A phase voltage binding posts for adopting plate and Jiao Cai Interface Terminals row are handed over respectively, the two ends of the connected wiring of the C are connected with the C phase voltage binding posts for adopting plate and Jiao Cai Interface Terminals row are handed over respectively, the B phase voltage binding posts that Interface Terminal row is adopted in one end of the connected wiring of the B and the friendship are connected, the other end of the connected wiring of the B can hand over the B phase voltages binding post or N phase voltage binding posts of adopting plate detachably connected with described, the N phase voltage binding posts that Interface Terminal row is adopted in one end of the connected wiring of the N and friendship are connected, the other end of the connected wiring of the N can hand over the N phase voltage binding posts for adopting plate detachably connected with described；
The resistance of the sample resistance of three voltage sampling circuits is equal, and more than or equal to 220K；The computation chip is used to calculate three-phase bus magnitude of voltage respectively according to the output of three voltage sampling circuits, and judges the alternating current type of measured three-phase bus according to any one phase bus voltage value for calculating.
2. universal electricity load management terminal according to claim 1, it is characterized in that, described computation chip is used in any one phase bus voltage value for calculating more than 0V and during less than or equal to 75V, the alternating current type for judging measured three-phase bus is 57.7V three-phase and four-lines, in any one phase bus voltage value for calculating more than 75V and during less than or equal to 150V, the alternating current type for judging measured three-phase bus is 100V phase three-wire threes, in any one phase bus voltage value for calculating more than 150V and during less than or equal to 300V, the alternating current type for judging measured three-phase bus is 220V three-phase and four-lines.
3. universal electricity load management terminal according to claim 1, it is characterised in that the resistance of the sample resistance of three voltage sampling circuits is 220K.
4. the universal electricity load management terminal according to claim 1 or 3, it is characterised in that described sample resistance is 0.1% precision, the precision resister of 15ppm temperature drifts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510877298.9A CN106843020B (en) | 2015-12-03 | 2015-12-03 | General power load management terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510877298.9A CN106843020B (en) | 2015-12-03 | 2015-12-03 | General power load management terminal |
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| CN106843020A true CN106843020A (en) | 2017-06-13 |
| CN106843020B CN106843020B (en) | 2021-08-31 |
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| CN201510877298.9A Expired - Fee Related CN106843020B (en) | 2015-12-03 | 2015-12-03 | General power load management terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108918995A (en) * | 2018-06-12 | 2018-11-30 | 六盘水金星机电设备有限公司 | A kind of portable three-phase power load monitor |
| CN112398222A (en) * | 2020-11-09 | 2021-02-23 | 北京昊创瑞通电气设备有限公司 | Intelligent terminal fusion AC acquisition system for transformer area |
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| CN106843020B (en) | 2021-08-31 |
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