CN106843020B - General power load management terminal - Google Patents
General power load management terminal Download PDFInfo
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- CN106843020B CN106843020B CN201510877298.9A CN201510877298A CN106843020B CN 106843020 B CN106843020 B CN 106843020B CN 201510877298 A CN201510877298 A CN 201510877298A CN 106843020 B CN106843020 B CN 106843020B
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- 238000005065 mining Methods 0.000 claims abstract description 52
- 238000005070 sampling Methods 0.000 claims abstract description 47
- 238000004804 winding Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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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
Abstract
The invention discloses a universal power load management terminal which comprises a metering chip, an alternate mining plate and an alternate mining interface terminal row. The alternating mining plate and the alternating mining interface terminal row are both provided with A, B, C and N-phase voltage wiring terminals; the alternating current acquisition module comprises A, B, C and an N-phase connecting wire. One end of the B-phase connecting line and one end of the N-phase connecting line are respectively connected with the B-phase voltage connecting terminal and the N-phase voltage connecting terminal of the alternate mining interface terminal row, the other end of the B-phase connecting line can be detachably connected with the B-phase voltage connecting terminal or the N-phase voltage connecting terminal of the alternate mining plate, and the other end of the N-phase connecting line can be detachably connected with the N-phase voltage connecting terminal of the alternate mining plate. The resistance values of the sampling resistors of the three voltage sampling circuits of the alternating-collecting plate are equal; the metering chip is used for respectively calculating three-phase bus voltage values according to the outputs of the three voltage sampling circuits and judging the alternating current type of the measured three-phase bus according to the calculated any one-phase bus voltage value. The invention is suitable for three types of three-phase alternating current measurement.
Description
Technical Field
The present invention relates to a power load management terminal.
Background
Power load management terminals have been widely used in the field of power automation, and one of the main functions is to measure three-phase ac power on site. The three-phase alternating current modes on site generally comprise three types, namely 220V three-phase four-wire, 100V three-phase three-wire and 57.7V three-phase four-wire. In order to measure the three different types of three-phase alternating currents, the conventional power load management terminals are also classified into three types of 220V three-phase four-wire, 100V three-phase three-wire, and 57.7V three-phase four-wire, and the three different methods are respectively used for measurement.
Fig. 1 shows a schematic block diagram of an existing three-phase four-wire 220V type power load management terminal. As shown in the figure, the power load management terminal mainly includes a CPU91, an interface module 92, a display module 93, a communication module 94, and an ac collection module 95. The power load management terminal mainly measures three-phase alternating current through the alternating current acquisition module 95. The ac collection module 95 includes a metering chip 951, an alternate collection board 952, and an alternate collection interface terminal array 953. The voltage and current lines of the three-phase alternating current are connected to the alternate mining interface terminal row 953 of the terminal, and then enter the alternate mining plate 952 through a connecting line between the alternate mining interface terminal row 953 and the alternate mining plate 952. The sampling board 952 processes the voltage and current to convert the voltage and current into an analog signal which can be measured, the analog signal is sent to the metering chip 951, and meanwhile, the sampling board 952 provides the information of the type of the alternating current measured by the sampling board 952 to the metering chip 951. The panel 952 includes three voltage collecting circuits 9521 for measuring A, B, C three-phase bus voltages, respectively, a current collecting circuit 9522 for measuring A, B, C three-phase bus currents, respectively, and an ac type determining circuit 9523. The metering chip 951 reads an analog quantity signal sent by the alternating-current board, data such as each phase voltage, current, active power, reactive power, electric quantity and phase angle of three-phase alternating current are calculated according to a corresponding program in the chip, the metering chip 951 reads type information of the three-phase alternating current provided by the alternating-current board 952, and a corresponding calculation mode is selected.
The basic composition of the power load management terminal of 100V three-phase three-wire and 57.7V three-phase four-wire is also substantially the same as that of fig. 1, but the internal procedures of the adopted AC interface terminal row, the AC board and the metering chip are different, and the differences are mainly reflected in the following aspects:
1. the connection modes of the voltage lines of the cross mining plate are different. For the power load management terminal for measuring 57.7V three-phase four-wire and 220V three-phase four-wire, the voltage connection terminals of the alternating-sampling interface terminal row and the voltage connection terminals of the alternating-sampling board are in one-to-one correspondence, that is, the a-phase voltage connection terminals, the B-phase voltage connection terminals, the C-phase voltage connection terminals and the N-phase voltage connection terminals of the alternating-sampling interface terminal row are fixedly connected (usually welded) with the a-phase voltage connection terminals, the B-phase voltage connection terminals, the C-phase voltage connection terminals and the N-phase voltage connection terminals of the alternating-sampling board in one-to-one correspondence respectively through the a-phase connection lines, the B-phase connection lines, the C-phase connection lines and the N-phase connection lines. In the power load management terminal for measuring 100V three-phase three-wire, the alternating current terminal row is not provided with an N-phase voltage connection terminal, and a B-phase voltage connection terminal of the alternating current terminal row is fixedly connected (usually welded) to the N-phase voltage connection terminal of the alternating current panel through a B-phase connection wire.
2. The resistance values of the sampling resistors of the voltage acquisition circuits in the alternating-collecting plates are different. Three voltage acquisition circuits for respectively measuring A, B, C three-phase bus voltage are arranged in the intersection board, and the three voltage acquisition circuits have the same structure. For the three different types of power load management terminals, although the structures of the voltage acquisition circuits between the three different types of power load management terminals are also the same, the resistance values of the sampling resistors in the voltage acquisition circuits are different. Fig. 2 shows a circuit schematic of the voltage acquisition circuit of three different types of power load management terminals. The voltage acquisition circuit includes a voltage transformer T1, a sampling resistor R, and a protection circuit 955. One end of the sampling resistor R is connected with a corresponding voltage wiring terminal on the alternate sampling board, and the other end of the sampling resistor R is connected with one end of a primary winding of a voltage transformer T1. The other end of the primary winding of the voltage transformer T1 is connected to an N-phase (common) voltage connection terminal on the AC panel. The secondary winding of the voltage transformer T1 is connected to the input of a protection circuit 955. The protection circuit 955 is composed of two diodes V1, V2 connected in parallel in an inverted phase, and an output terminal of the protection circuit 955 is connected to the metering chip.
The sampling resistors R of the common three-phase four-wire 220V, three-phase three-wire 100V and three-phase four-wire 57.7V alternating plates respectively take values of 220K, 100K and 57.7K. If the three types of three-phase alternating-current voltages of 220V, 100V and 57.7V on site are all 100% ranges, the current value passing through the sampling resistor R when the voltage value is maximum is as follows:
. In three different types of power load management terminals, when a metering chip reads 1.414mA, different calculation formulas are respectively adopted to calculate instantaneous voltage values of 220V, 100V and 57.7V.
3. The alternating current type judging circuits on the alternating current collecting plates are different. As shown in fig. 3, in the three types of power load management terminals, the 100V three-phase three-wire panel is mounted with the resistor R102 and without the resistor R103, and fig. 3 shows the resistor R102 and the resistor R103 at the same time for the sake of simplicity only. The resistance R103 and the resistance R102 are mounted on the cross mining plate for measuring 57.7V three-phase four-wire, and the resistance R103 and the resistance R102 are neither mounted on the cross mining plate for measuring 220V three-phase four-wire. When the resistor R102 or R103 is mounted, the corresponding signal is grounded, and the value is 0; when the resistor R102 or the resistor R103 is not installed, the corresponding signal is pulled high through a peripheral circuit of the metering chip, and the value is 1. The metering chip judges the type of the AC acquisition board and the three-phase AC measured by the AC acquisition board according to the read values of 'MODE 0' and 'MODE 1', and informs the judgment result to a CPU of the power load management terminal.
As can be seen from the above, the existing power load management terminal of one type can only measure three-phase ac power of the same type, but cannot measure three-phase ac power of other types. Therefore, the existing power load management terminal has no universality and cannot meet the increasingly complex requirements of the site. Meanwhile, in the production process of products, the type of the power load management terminal can be determined only after specific configuration requirements of a power company are determined, so that production and stock cannot be carried out in advance, the production period is prolonged, and the production cost is increased invisibly.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a power load management terminal with good universality, which can be suitable for three-phase alternating current measurement of 220V three-phase four-wire, 100V three-phase three-wire and 57.7V three-phase four-wire.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the universal power load management terminal comprises an alternating current acquisition module, a data acquisition module and a data acquisition module, wherein the alternating current acquisition module comprises a metering chip, an alternating current acquisition board and an alternating current acquisition interface terminal row; the alternating-current mining plate comprises three voltage acquisition circuits for respectively measuring the voltage of the three-phase bus, each voltage acquisition circuit comprises a voltage transformer and a sampling resistor, one end of each sampling resistor is connected with a corresponding voltage wiring terminal on the alternating-current mining plate, the other end of each sampling resistor is connected with one end of a primary winding of the voltage transformer, and the other end of the primary winding of the voltage transformer is connected with an N-phase voltage wiring terminal on the alternating-current mining plate; the alternating current mining plate and the alternating current mining interface terminal row are respectively provided with an A-phase voltage wiring terminal, a B-phase voltage wiring terminal, a C-phase voltage wiring terminal and an N-phase voltage wiring terminal; the alternating current acquisition module comprises an A-phase connecting wire, a B-phase connecting wire, a C-phase connecting wire and an N-phase connecting wire; the two ends of the A-phase connecting line are respectively connected with an A-phase voltage wiring terminal of the alternating mining plate and an A-phase voltage wiring terminal of the alternating mining interface terminal row, the two ends of the C-phase connecting line are respectively connected with a C-phase voltage wiring terminal of the alternating mining plate and the alternating mining interface terminal row, one end of the B-phase connecting line is connected with a B-phase voltage wiring terminal of the alternating mining interface terminal row, the other end of the B-phase connecting line can be detachably connected with the B-phase voltage wiring terminal or an N-phase voltage wiring terminal of the alternating mining plate, one end of the N-phase connecting line is connected with an N-phase voltage wiring terminal of the alternating mining interface terminal row, and the other end of the N-phase connecting line can be detachably connected with the N-phase voltage wiring terminal of the alternating mining plate; the resistance values of the sampling resistors of the three voltage sampling circuits are equal; the metering chip is used for respectively calculating three-phase bus voltage values according to the outputs of the three voltage sampling circuits and judging the alternating current type of the measured three-phase bus according to the calculated any one-phase bus voltage value.
Due to the adoption of the technical scheme, the three-phase AC measurement device can be suitable for three types of three-phase AC measurement, namely 220V three-phase four-wire, 100V three-phase three-wire and 57.7V three-phase four-wire, so that the operation of measurement personnel is facilitated, and the production cost can be reduced.
Drawings
Fig. 1 is a schematic block diagram of a conventional power load management terminal for measuring 220V three-phase four-wire ac power.
Fig. 2 shows a circuit schematic of the voltage acquisition circuit of three different types of power load management terminals.
Fig. 3 shows a schematic diagram of an alternating current type determination circuit of an alternating current panel of three different types of power load management terminals.
Fig. 4 shows a functional block diagram of a power load management terminal according to an embodiment of the present invention.
Fig. 5 shows a wiring diagram of a cross panel according to an embodiment of the invention when measuring 57.7V three-phase four-wire and 220V three-phase four-wire ac power.
Fig. 6 shows a wiring diagram of the cross panel for measuring 100V three-phase three-wire ac according to an embodiment of the invention.
Fig. 7 shows a circuit schematic of a voltage acquisition circuit of a power load management terminal according to an embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Fig. 4 shows a functional block diagram of a general-purpose power load management terminal according to an embodiment of the invention. The universal power load management terminal comprises a CPU1, an interface module 2, a display module 3, a communication module 4 and an alternating current acquisition module 5. The alternating current acquisition module 5 includes a metering chip 51, an alternate acquisition board 52 and an alternate acquisition interface terminal row 53. The voltage and current lines of the three-phase alternating current are connected to the alternate mining interface terminal row 53 of the terminal, and then enter the alternate mining plate 52 through the connecting line between the alternate mining interface terminal row 53 and the alternate mining plate 52. Please refer to fig. 5. In the present embodiment, the alternating current plate 52 and the alternating current interface terminal row 53 each have an a-phase voltage connection terminal, a B-phase voltage connection terminal, a C-phase voltage connection terminal, and an N-phase voltage connection terminal; the alternating current acquisition module comprises an A-phase connecting line 61, a B-phase connecting line 62, a C-phase connecting line 63 and an N-phase connecting line 64. Two ends of an A-phase connecting line 61 are respectively connected with an A-phase voltage wiring terminal of an alternating mining plate and an alternating mining interface terminal row, two ends of a C-phase connecting line 63 are respectively connected with a C-phase voltage wiring terminal of the alternating mining plate and the alternating mining interface terminal row, one end of a B-phase connecting line 62 is connected with a B-phase voltage wiring terminal of the alternating mining interface terminal row, the other end of the B-phase connecting line can be detachably connected with a B-phase voltage wiring terminal 57 or an N-phase voltage wiring terminal 58 of the alternating mining plate, one end of an N-phase connecting line 64 is connected with an N-phase voltage wiring terminal of the alternating mining interface terminal row, and the other end of the N-phase connecting line 64 can be detachably connected with an N-phase voltage wiring terminal 58 of the alternating mining plate. The detachable connection manner includes, but is not limited to, a bolt connection manner and the like. Fig. 5 shows a connection diagram of the inventive AC panel for measuring 57.7V three-phase four-wire and 220V three-phase four-wire ac currents, wherein the other ends of the B-phase connection line 62 and the N-phase connection line 64 are connected to the B-phase voltage connection terminal 57 and the N-phase voltage connection terminal 58 of the AC panel, respectively. When the alternating current panel is used for measuring 100V three-phase three-wire alternating current, only the N-phase connecting wire 64 needs to be taken away, and the other end of the B-phase connecting wire 62 is connected with an N-phase voltage connecting terminal 58 of the alternating current panel, as shown in figure 6.
The panel 52 according to an embodiment of the present invention includes three voltage acquisition circuits 521 for measuring A, B, C three-phase bus voltages, respectively, and three current acquisition circuits 522 for measuring A, B, C three-phase currents, respectively (for simplicity, only one voltage acquisition circuit 521 and one current acquisition circuit 522 are shown). The voltage acquisition circuit 521 has a structure as shown in fig. 7, and includes a voltage transformer T1 and a sampling resistor R ', one end of the sampling resistor R ' is connected to a corresponding voltage connection terminal on the interleaved board, the other end of the sampling resistor R ' is connected to one end of the primary winding of the voltage transformer T1, and the other end of the primary winding of the voltage transformer T1 is connected to an N-phase voltage connection terminal on the interleaved board. The secondary winding of the voltage transformer T1 is connected to the input of the protection circuit 55. The protection circuit 55 is composed of two diodes V1 and V2 which are connected in parallel in an inverted mode, and the output end of the protection circuit 55 is connected to the metering chip.
In this embodiment, in order to achieve the versatility of the product, the resistance values of the sampling resistors R' of the three voltage sampling circuits 521 are equal to each other and are greater than or equal to 220K. The resistance of the sampling resistor R' is preferably 220K in consideration of accuracy and the like. The metering chip 51 is used for calculating three-phase bus voltage values according to the outputs of the three voltage sampling circuits. Regardless of the type of ac electrical parameter being calculated, the metering chip 51 uses a consistent electrical parameter calculation formula. The electrical parameters include phase voltage, phase current, phase angle, active power, reactive power, electric quantity, and the like.
When the resistance values of the sampling resistors R' of the three voltage sampling circuits 521 are all set to 220K, if the three types of three-phase ac voltages of 220V, 100V and 57.7V on site are all 100% range, the current values after passing through the sampling resistors when the voltage value is maximum are respectively:
it can be known that the ratio of the converted current value to the ac voltage is constant, and is the same as the ratio when the three-phase four-wire 220V ac is measured in the existing power load terminal, so the electrical parameter calculation formula in this embodiment is the electrical parameter calculation formula adopted by the existing power load management terminal for measuring the three-phase four-wire 220V type. On the other hand, when the power load management terminal of the present embodiment measures ac power of 100V three-phase three-wire and 57.7V three-phase four-wire, the current values of the peak voltages passing through the sampling resistors are 0.643mA and 0.371mA, respectively, and the current values are too small to fully utilize the range of the metering chip, which may cause measurement errors. In order to reduce the error in voltage sampling, the sampling resistor R' is preferably a high-precision resistor with 0.1% precision and 15ppm temperature drift.
Taking the metering chip with the model 71M6513 as an example, when the resistance value of the sampling resistor R' is 220K, no matter which type of alternating current is measured by the power load management terminal, the phase voltage calculation formula used by the metering chip is:
Ux=（VxSQSUM*LSB*3600*Fs/Nacc）1/2
the VxSQSUM is the square sum of sampling of each phase voltage of the metering chip in the last accumulation period and is used for automatic acquisition and calculation of the metering chip; fs =2520.62Hz, which is the sampling frequency of the metrology chip; the Nacc is the number of sampling points in an accumulation period, and the actual value is manually set in advance; LSB = 9.4045 × 10-13*VMAX2(unit is: V)2h) In that respect VMAX is the effective voltage value applied by the corresponding external three-phase alternating current when the voltage collected by the metering chip at the voltage input end is 250 mVp-p. The above formula is also a phase voltage calculation formula of a metering chip of type 71M6513 in an existing power load management terminal for measuring 220V three-phase four-wire alternating current. Accordingly, the calculation formula for calculating other electrical parameters by the metering chip 51 is also the calculation formula for the electrical parameters of the metering chip model 71M6513 in the existing power load management terminal for measuring 220V three-phase four-wire alternating current.
In addition, in order to realize the versatility of the acquisition board, the acquisition board 52 cancels the previous ac type determination circuit, and instead of providing the measurement chip 51 with the type information of the three-phase ac to be measured, the measurement chip 51 determines the type information of the three-phase ac. In a more detailed embodiment, the metering chip 51 is configured to determine that the ac type of the measured three-phase bus is 57.7V three-phase four-wire when the calculated voltage value of any one of the phases is greater than 0V and equal to or less than 75V, determine that the ac type of the measured three-phase bus is 100V three-phase three-wire when the calculated voltage value of any one of the phases is greater than 75V and equal to or less than 150V, and determine that the ac type of the measured three-phase bus is 220V three-phase four-wire when the calculated voltage value of any one of the phases is greater than 150V and equal to or less than 300V.
The foregoing description is further illustrative of the present invention with reference to the following detailed description and accompanying drawings. It will be apparent, however, to one skilled in the art that the present invention may be practiced in many other ways than those specifically set forth herein, and that these variations may be performed in many different ways without departing from the spirit and scope of the present invention.
Claims (3)
1. The universal power load management terminal comprises an alternating current acquisition module, wherein the alternating current acquisition module comprises a metering chip, an alternating current acquisition board and an alternating current acquisition interface terminal row; the alternating-current mining plate comprises three voltage acquisition circuits for respectively measuring three-phase bus voltage, each voltage acquisition circuit comprises a voltage transformer and a sampling resistor, one end of each sampling resistor is connected with a corresponding voltage wiring terminal on the alternating-current mining plate, the other end of each sampling resistor is connected with one end of a primary winding of the voltage transformer, and the other end of the primary winding of the voltage transformer is connected with an N-phase voltage wiring terminal on the alternating-current mining plate; the alternating-current mining plate and the alternating-current mining interface terminal row are respectively provided with an A-phase voltage wiring terminal, a B-phase voltage wiring terminal, a C-phase voltage wiring terminal and an N-phase voltage wiring terminal; the alternating current acquisition module comprises an A-phase connecting wire, a B-phase connecting wire, a C-phase connecting wire and an N-phase connecting wire;
the two ends of the A-phase connecting line are respectively connected with an A-phase voltage wiring terminal of an alternating mining plate and an alternating mining interface terminal row, the two ends of the C-phase connecting line are respectively connected with a C-phase voltage wiring terminal of the alternating mining plate and the alternating mining interface terminal row, one end of the B-phase connecting line is connected with a B-phase voltage wiring terminal of the alternating mining interface terminal row, the other end of the B-phase connecting line can be detachably connected with the B-phase voltage wiring terminal or an N-phase voltage wiring terminal of the alternating mining plate, one end of the N-phase connecting line is connected with an N-phase voltage wiring terminal of the alternating mining interface terminal row, and the other end of the N-phase connecting line can be detachably connected with the N-phase voltage wiring terminal of the alternating mining plate;
the resistance values of the sampling resistors of the three voltage acquisition circuits are equal and are more than or equal to 220K; the metering chip is used for respectively calculating three-phase bus voltage values according to the outputs of the three voltage acquisition circuits, judging the alternating current type of the measured three-phase bus according to any one calculated phase bus voltage value, judging the alternating current type of the measured three-phase bus to be 57.7V three-phase four-wire when any one calculated phase bus voltage value is larger than 0V and smaller than or equal to 75V, judging the alternating current type of the measured three-phase bus to be 100V three-wire when any one calculated phase bus voltage value is larger than 75V and smaller than or equal to 150V, and judging the alternating current type of the measured three-phase bus to be 220V three-wire when any one calculated phase bus voltage value is larger than 150V and smaller than or equal to 300V.
2. The universal power load management terminal according to claim 1, wherein the sampling resistors of the three voltage acquisition circuits have a resistance of 220K.
3. The universal power load management terminal according to claim 1, wherein the sampling resistor is a high precision resistor with a precision of 0.1% and a temperature drift of 15 ppm.
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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 |
| CN112398222B (en) * | 2020-11-09 | 2022-07-01 | 北京昊创瑞通电气设备股份有限公司 | Intelligent terminal fusion AC acquisition system for transformer area |
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| CN102680779A (en) * | 2012-04-23 | 2012-09-19 | 深圳华越南方电子技术有限公司 | Adaptive control method for three-phase electric energy meter and three-phase electric energy meter |
| CN104297562A (en) * | 2014-10-23 | 2015-01-21 | 武汉盛帆电子股份有限公司 | Intelligent identification type electric energy meter |
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| DE102012022132A1 (en) * | 2012-11-13 | 2014-05-15 | Tq-Systems Gmbh | Smart meter |
| CN103901269B (en) * | 2014-04-01 | 2017-09-22 | 江南大学 | It is easy to switch the electrical quantity measurement arrangement of the mode of connection |
| CN204832286U (en) * | 2015-07-10 | 2015-12-02 | 成都天兴电气有限公司 | Three -way and four -wire metering method automatic switching control equipment of three -phase electric energy meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680779A (en) * | 2012-04-23 | 2012-09-19 | 深圳华越南方电子技术有限公司 | Adaptive control method for three-phase electric energy meter and three-phase electric energy meter |
| CN104297562A (en) * | 2014-10-23 | 2015-01-21 | 武汉盛帆电子股份有限公司 | Intelligent identification type electric energy meter |
Non-Patent Citations (1)
| Title |
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| 基于LPC1768智能电力监控终端的设计与实现;钱国明;《中国优秀硕士学位论文全文数据库（硕士）工程科技Ⅱ辑（月刊）》;20130415(第04期);C042-250：P1-73 * |
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