CN110308324B - Method and device for collecting three-phase alternating current energy - Google Patents

Method and device for collecting three-phase alternating current energy Download PDF

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CN110308324B
CN110308324B CN201910619120.2A CN201910619120A CN110308324B CN 110308324 B CN110308324 B CN 110308324B CN 201910619120 A CN201910619120 A CN 201910619120A CN 110308324 B CN110308324 B CN 110308324B
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voltage
alternating current
phase alternating
electric energy
current
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CN110308324A (en
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吉学龙
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Shenzhen Zhongyuantong Power Source Technology Development Co ltd
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Shenzhen Zhongyuantong Power Source Technology Development Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/04—Voltage dividers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G01R19/2509—Details concerning sampling, digitizing or waveform capturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/061—Details of electronic electricity meters
    • G01R22/063—Details of electronic electricity meters related to remote communication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion

Abstract

The application provides a method and a device for collecting three-phase alternating current energy, wherein the method comprises the following steps: the voltage receiving end of each phase in the voltage collector is respectively connected with the voltage collecting end of the live wire and the zero line of each phase in the three-phase alternating current, the voltage signal output end is connected with the three-phase alternating current energy collecting processor, and a voltage division isolator is arranged between the voltage receiving end and the voltage signal output end; the current receiving end of each phase in the current collector is respectively connected with the current collecting end of each phase in the three-phase alternating current, the current signal output end of the current collector is connected with the three-phase alternating current energy collecting processor, and a shunt isolator is arranged between the current receiving end and the current signal output end of each line; and performing analog-digital processing on the acquired three-phase alternating current signals through a three-phase alternating current energy acquisition processor to obtain three-phase alternating current energy data. The invention realizes the acquisition and processing of multi-path three-phase alternating current energy.

Description

Method and device for collecting three-phase alternating current energy
Technical Field
The application relates to the technical field of electric energy collection, in particular to a method and a device for collecting three-phase alternating current electric energy.
Background
Electrical energy refers to the ability to use electricity to perform work in various forms (i.e., produce energy). The electric energy is an economic, practical, clean and easily controlled and converted energy form, and is a special product (which also has a plurality of characteristics of the product, such as being measured, estimated, guaranteed or improved) which is provided by three parties to guarantee the quality for power users by the power department, and the electric energy is widely applied to various fields of power, illumination, chemistry, textile, communication, broadcasting and the like, is the main power of scientific and technical development and economic leap of people, and plays an important role in our lives.
The three-phase alternating current is an electric power system consisting of three alternating current circuits with the same frequency, the same potential amplitude and the phase difference of 120 degrees, and the three-phase alternating current is produced and distributed in China at present. With the improvement of living standard and the rapid development of urbanization construction of people, especially the rapid growth of large public buildings in recent years, especially the coming of the 5G communication era, the establishment of large-scale data centers and the increasing problem of building energy consumption are more and more prominent.
In a large-scale data center, monitoring of power consumption of data equipment is more and more important, and service providers also start to charge fees according to the power consumption of each equipment. Therefore, hundreds of circuits of electric equipment in one cabinet need to be monitored by electric energy, but the space of the cabinet is limited, so that a common monitoring device is required to monitor multiple paths of three-phase alternating current electric energy to achieve the purposes of safely and stably monitoring the electric energy and not influencing the normal operation in the cabinet. And the special measurement chip of ammeter three-phase on the current market can only measure three-phase four-wire or three-phase three-wire alternating current, needs a plurality of independent ammeters to the measurement of unnecessary three routes electric energy, very resource-wasting, and a plurality of ammeters still can influence the risk of rack function, also do not do benefit to the installation.
Therefore, how to provide a multi-path three-phase alternating current energy acquisition scheme which can monitor the use condition of multi-path three-phase alternating current energy and does not influence the functions of other equipment is a technical problem to be solved urgently in the field.
Disclosure of Invention
The application aims to provide a method and a device for collecting three-phase alternating current energy, and the technical problem that in the prior art, multi-path three-phase alternating current energy collection which can monitor multi-path three-phase alternating current electric energy simultaneously and does not influence functions of other equipment is not available is solved.
In order to achieve the above object, the present application provides a method for collecting three-phase alternating current energy, comprising:
in the three-phase alternating current energy collector, a voltage receiving end of each phase in the voltage collector is respectively connected with voltage collecting ends of a live wire and a zero wire of each phase in the three-phase alternating current, a voltage signal output end of the voltage collector is connected with a three-phase alternating current energy collecting processor, and a voltage division isolator is arranged between the voltage receiving end and the voltage signal output end of each line;
connecting a current receiving end of each phase in a current collector with a current collecting end of each phase in three-phase alternating current respectively, connecting a current signal output end of the current collector with a three-phase alternating current energy collecting processor, and arranging a shunt isolator between the current receiving end and the current signal output end of each line;
and performing analog-digital processing on the three-phase alternating current voltage signals acquired by the voltage acquisition unit and the three-phase alternating current signals acquired by the current acquisition unit through the three-phase alternating current energy acquisition processor to obtain three-phase alternating current energy data of the three-phase alternating current.
Optionally, wherein the method comprises: in the partial pressure isolator, a first partial pressure is generated,
connecting more than or equal to one voltage dividing resistor in series to form a voltage dividing unit, and connecting the voltage dividing unit and a voltage dividing isolation resistor in series and then connecting the voltage dividing unit and a voltage dividing grounding wire;
connecting two ends of the voltage division unit with the voltage receiving end and the voltage signal output end respectively;
and a voltage division isolation capacitor is connected in parallel with the voltage division isolation resistor between the voltage division unit and the voltage division grounding wire to form an isolation unit.
Optionally, wherein the method comprises: in the case of the shunt isolator described above,
connecting more than or equal to one shunt resistor in parallel to form a shunt unit, and respectively connecting two ends of the shunt unit with the current receiving end and the current signal output end;
connecting one end of a shunt isolation resistor between the current receiving end and the shunt unit, and connecting the other end of the shunt isolation resistor with a shunt grounding wire;
and one end of the shunt isolation capacitor is connected between the shunt unit and the current signal output end, and the other end of the shunt isolation capacitor is connected between the shunt isolation resistor and the shunt grounding wire.
Optionally, wherein the method further comprises:
connecting one or more paths of three-phase alternating current energy collectors to a three-phase alternating current signal input end of an electric energy center processor;
the electric energy central processor receives the three-phase alternating current electric energy data, processes the three-phase alternating current electric energy data according to a preset three-phase alternating current signal processing strategy and outputs the three-phase alternating current electric energy data through the communication processor;
and utilizing an isolated power supply to supply power to the communication processor.
Optionally, wherein the method further comprises:
respectively acquiring branch voltage and branch current by using a branch voltage collector and a branch current collector of a branch electric energy collector to obtain branch electric energy data, and transmitting the branch electric energy data to the electric energy central processor;
the electric energy central processor receives the branch electric energy data, processes the branch electric energy data according to a preset branch electric signal processing strategy, and outputs the branch electric energy data through the communication processor;
the switching value input end of the electric energy central processor is connected with the signal input controller, receives a control instruction of the external controller and executes the control instruction; and the relay output end of the electric energy central processor is connected with the signal output controller, and generates a control instruction according to a preset trigger strategy to control the on-off of the signal output controller.
In another aspect, the present invention further provides a device for collecting three-phase ac power, including: the device comprises a voltage collector, a current collector and a three-phase alternating current energy collecting processor; wherein the content of the first and second substances,
in the voltage collector, a voltage receiving end of each phase is respectively connected with voltage collecting ends of a live wire and a zero wire of each phase in three-phase alternating current, a voltage signal output end is connected with the three-phase alternating current energy collecting processor, and a voltage division isolator is arranged between the voltage receiving end and the voltage signal output end of each line;
in the current collector, a current receiving end of each phase is respectively connected with a current collecting end of each phase in three-phase alternating current, a current signal output end is connected with the three-phase alternating current energy collecting processor, and a shunt isolator is arranged between the current receiving end of each line and the current signal output end;
the three-phase alternating current energy acquisition processor is respectively connected with the voltage collector and the current collector, and carries out analog-digital processing on the three-phase alternating current voltage signals collected by the voltage collector and the three-phase alternating current signals collected by the current collector to obtain three-phase alternating current energy data of the three-phase alternating current.
Optionally, wherein, in the partial pressure isolator, the method comprises: the voltage division unit, the voltage division isolation resistor and the voltage division isolation capacitor are arranged in the circuit board; wherein the content of the first and second substances,
the voltage dividing unit comprises more than or equal to one serial voltage dividing resistor, and two ends of the voltage dividing unit are respectively connected with the voltage receiving end and the voltage signal output end;
one end of the voltage division isolation resistor is connected with the voltage division unit in series, and the other end of the voltage division isolation resistor is connected with a voltage division grounding wire;
the voltage division isolation capacitor is connected between the voltage division unit and the voltage division grounding wire in parallel with the voltage division isolation resistor to form an isolation unit.
Optionally, wherein, in the shunt isolator, the method includes: the shunt unit, the shunt isolation resistor and the shunt isolation capacitor are connected in series; wherein the content of the first and second substances,
the shunt unit comprises more than or equal to one shunt resistor in parallel, and two ends of the shunt unit are respectively connected with the current receiving end and the current signal output end;
one end of the shunt isolation resistor is connected between the current receiving end and the shunt unit, and the other end of the shunt isolation resistor is connected with a shunt grounding wire;
one end of the shunt isolation capacitor is connected between the shunt unit and the current signal output end, and the other end of the shunt isolation capacitor is connected between the shunt isolation resistor and the shunt grounding wire.
Optionally, wherein the apparatus further comprises: the system comprises an electric energy central processor, a communication processor and an isolation power supply; wherein the content of the first and second substances,
in the electric energy central processor, a three-phase alternating current signal input end is connected with one or more paths of three-phase alternating current electric energy collectors, and the received three-phase alternating current electric energy data are processed according to a preset three-phase alternating current signal processing strategy to obtain three-phase alternating current communication data;
the communication processor is connected with the communication output end of the electric energy center processor, and is used for receiving and outputting the three-phase alternating current communication data;
and the isolation power supply is connected with the communication processor and supplies power to the communication processor.
Optionally, wherein the apparatus further comprises: the branch electric energy collector, the signal input controller and the signal output controller; wherein the content of the first and second substances,
the branch electric energy collector is connected with a branch electric signal input end of the electric energy central processor, and respectively collects branch voltage and branch current through the branch voltage collector and the branch current collector to obtain branch electric energy data, and transmits the branch electric energy data to the electric energy central processor;
the electric energy central processor receives the branch electric energy data, processes the branch electric energy data according to a preset branch electric signal processing strategy, and outputs the branch electric energy data through the communication processor;
the signal input controller is connected with the switching value input end of the electric energy central processor, receives a control instruction of an external controller and executes the control instruction;
and the signal output controller is connected with the relay output end of the electric energy central processor and generates a control instruction according to a preset trigger strategy to control the on-off of the signal output controller.
The method and the device for collecting the three-phase alternating current energy have the beneficial effects that at least the following effects are realized:
(1) the method and the device for collecting the three-phase alternating current energy have the advantages that the voltage is directly collected from the live wire and the zero line in a resistance voltage division mode, alternating currents of different zero lines can be compatible in a mode of not sharing the zero line, each zero line is isolated from the grounding wire through the voltage division isolator, the problem that a three-phase power supply chip works on one circuit board simultaneously and does not influence each other is solved, multiple paths of three-phase electric energy data can be collected simultaneously through one PCB, each path of three-phase electric energy data is not interfered and can be isolated, and the three-phase electric energy collection efficiency is improved.
(2) According to the method and the device for collecting the three-phase alternating current electric energy, the branch electric energy collector collects the voltage, the current, the power and other electric energy data of each branch, the three-phase electric energy collection processor collects the voltage, the current, the power and other electric energy of the three-phase alternating current, the electric energy quality of the three-phase electric energy can be analyzed and monitored, the communication processor communicates with the outside, the collected data are transmitted, and the function of remotely controlling the collection of the three-phase alternating current electric energy is achieved.
(3) According to the method and the device for three-phase alternating current energy collection, the isolation power supply is used for supplying power to the communication processor, weak current and strong current are isolated, the safety of three-phase electric energy collection is guaranteed, the device is further provided with the dry contact switch value input end and the dry contact relay output end, personalized requirements can be met, and the flexibility of three-phase alternating current energy collection control is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow chart of a method for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a second method for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a third method for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a fourth method for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a fifth method for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an apparatus for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a second apparatus for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a third apparatus for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a fourth apparatus for collecting three-phase AC power according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a fifth apparatus for collecting three-phase AC power according to an embodiment of the present invention;
fig. 11 is a schematic circuit diagram of a three-phase ac energy collector in an embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a three-phase ac power collecting and processing system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
As shown in fig. 1, which is a schematic flow chart of a method for acquiring three-phase ac power in this embodiment, a method for acquiring and processing multiple (39 possible) three-phase ac power data is provided in this embodiment. The method for acquiring the multipath three-phase alternating current electric energy comprises the following steps:
step 101, in a three-phase alternating current energy collector, a voltage receiving end of each phase in the voltage collector is respectively connected with voltage collecting ends of a live wire and a zero wire of each phase in the three-phase alternating current, a voltage signal output end of the voltage collector is connected with a three-phase alternating current energy collecting processor, and a voltage division isolator is arranged between the voltage receiving end and the voltage signal output end of each line.
102, respectively connecting a current receiving end of each phase in the current collector with a current collecting end of each phase in the three-phase alternating current, connecting a current signal output end of the current collector with a three-phase alternating current energy collecting processor, and arranging a shunt isolator between the current receiving end and the current signal output end of each line.
And 103, performing analog-to-digital processing on the three-phase alternating current voltage signals acquired by the voltage acquisition unit and the three-phase alternating current signals acquired by the current acquisition unit through the three-phase alternating current energy acquisition processor to obtain three-phase alternating current energy data of the three-phase alternating current.
In some optional embodiments, as shown in fig. 2, a schematic flow chart of a second method for collecting three-phase alternating current energy in this embodiment is shown, which is different from that in fig. 1, further includes:
step 201, in the voltage division isolator, more than or equal to one voltage division resistor is connected in series to form a voltage division unit, and the voltage division unit is connected in series with the voltage division isolation resistor and then connected with a voltage division grounding wire.
Step 202, connecting two ends of the voltage dividing unit with the voltage receiving end and the voltage signal output end respectively.
Step 203, connecting a voltage division isolation resistor in parallel with a voltage division isolation capacitor between the voltage division unit and the voltage division grounding wire to form an isolation unit.
In some optional embodiments, as shown in fig. 3, a schematic flow chart of a third method for collecting three-phase alternating-current electric energy in this embodiment is different from that in fig. 1, further including:
step 301, in the shunt isolator, one or more shunt resistors are connected in parallel to form a shunt unit, and two ends of the shunt unit are respectively connected with the current receiving end and the current signal output end.
Step 302, one end of the shunt isolation resistor is connected between the current receiving end and the shunt unit, and the other end of the shunt isolation resistor is connected with a shunt grounding wire.
And 303, connecting one end of the shunt isolation capacitor between the shunt unit and the current signal output end, and connecting the other end of the shunt isolation capacitor between the shunt isolation resistor and the shunt grounding wire.
In some optional embodiments, as shown in fig. 4, a schematic flow chart of a fourth method for collecting three-phase alternating-current electric energy in this embodiment is different from that in fig. 1, further including:
step 401, connecting one or more paths of three-phase alternating current energy collectors to a three-phase alternating current signal input end of an electric energy center processor.
And step 402, the electric energy center processor receives the three-phase alternating current electric energy data, processes the three-phase alternating current electric energy data according to a preset three-phase alternating current signal processing strategy, and outputs the three-phase alternating current electric energy data through the communication processor.
And 403, supplying power to the communication processor by using the isolation power supply.
In some optional embodiments, as shown in fig. 5, a schematic flow chart of a fifth method for collecting three-phase alternating current energy in this embodiment is shown, and different from fig. 4, the method further includes:
step 501, a branch voltage collector and a branch current collector of the branch electric energy collector are used for respectively collecting branch voltage and branch current to obtain branch electric energy data, and the branch electric energy data are transmitted to an electric energy central processor.
And step 502, the electric energy central processor outputs the received branch electric energy data through the communication processor after processing the received branch electric energy data according to a preset branch electric signal processing strategy.
Step 503, connecting the switching value input end of the electric energy central processor with the signal input controller, receiving the control instruction of the external controller and executing; and the relay output end of the electric energy central processor is connected with the signal output controller, and generates a control instruction according to a preset trigger strategy to control the on-off of the signal output controller.
In some optional embodiments, as shown in fig. 6, the schematic structural diagram of an apparatus 600 for collecting three-phase alternating current energy in this embodiment is used to implement the above-mentioned method for collecting three-phase alternating current energy, and specifically, the apparatus includes: a voltage collector 601, a current collector 602 and a three-phase alternating current energy collection processor 603.
In the voltage collector 601, the voltage receiving terminal of each phase is connected to the voltage collecting terminals of the live wire and the zero wire of each phase in the three-phase alternating current, the voltage signal output terminal is connected to the three-phase alternating current energy collecting processor 603, and a voltage dividing isolator 611 is arranged between the voltage receiving terminal and the voltage signal output terminal of each line.
In the current collector 602, the current receiving terminal of each phase is connected to the current collecting terminal of each phase of the three-phase ac power, the current signal output terminal is connected to the three-phase ac power collecting processor 603, and a shunt isolator 621 is provided between the current receiving terminal and the current signal output terminal of each line.
The three-phase ac electrical energy acquisition processor 603 is connected to the voltage collector 601 and the current collector 602, respectively, and performs analog-to-digital processing on the three-phase ac voltage signals collected by the voltage collector and the three-phase ac current signals collected by the current collector to obtain three-phase ac electrical energy data of the three-phase ac.
In some optional embodiments, as shown in fig. 7, a schematic structural diagram of a device 700 for collecting energy of a second three-phase alternating current in this embodiment is different from that in fig. 6, in a voltage division isolator 611, including: a voltage divider 612, a voltage divider isolation resistor 613, and a voltage divider isolation capacitor 614.
The voltage dividing unit 612 includes one or more serial voltage dividing resistors 615, and two ends of the voltage dividing unit are respectively connected to the voltage receiving terminal and the voltage signal output terminal.
One end of the voltage division isolation resistor 613 is connected in series with the voltage division unit 612, and the other end is connected to a voltage division ground line.
The voltage dividing isolation capacitor 614 is connected in parallel with the voltage dividing isolation resistor 613 between the voltage dividing unit 612 and the voltage dividing ground line to form an isolation unit.
In some alternative embodiments, as shown in fig. 8, which is a schematic structural diagram of a third apparatus 800 for collecting three-phase alternating current power in this embodiment, different from fig. 6, in the shunt isolator 621, including: a shunt unit 622, a shunt isolation resistor 623, and a shunt isolation capacitor 624.
The shunt unit 622 includes one or more shunt resistors 625, and two ends of the shunt unit are respectively connected to the current receiving terminal and the current signal output terminal.
One end of the shunt isolation resistor 623 is connected between the current receiving terminal and the shunt unit 622, and the other end is connected to a shunt ground line.
One end of the shunt isolation capacitor 624 is connected between the shunt unit 622 and the current signal output terminal, and the other end is connected between the shunt isolation resistor 623 and the shunt ground line.
In some optional embodiments, as shown in fig. 9, a schematic structural diagram of a fourth apparatus 900 for collecting three-phase alternating current energy in this embodiment is different from that in fig. 6, further including: an electric energy central processor 901, a communication processor 902 and an isolation power supply 903; wherein the content of the first and second substances,
in the electric energy central processor 901, a three-phase alternating current signal input end is connected with one or more three-phase alternating current energy collectors 600, and three-phase alternating current electric energy data is received and processed according to a preset three-phase alternating current signal processing strategy to obtain three-phase alternating current communication data.
The electric energy Central processor can be a Micro Control Unit (MCU), also called Single Chip Microcomputer (Single Chip Microcomputer) or a Single Chip Microcomputer, which properly reduces the frequency and specification of a Central Processing Unit (CPU), and integrates peripheral interfaces such as a memory (memory), a counter (Timer), a USB, an a/D conversion, a UART, a PLC, a DMA, and the like, even an LCD driving circuit, on a Single Chip to form a Chip-level computer, which performs different combination control for different application occasions.
And the communication processor 902 is connected with the communication output end of the electric energy center processor 901, and receives and outputs three-phase alternating current communication data.
In some alternative embodiments, the communication processor 902 may be a CAN module or an RS485 module, and may also include a CAN module and an RS485 module. The RS485 bus has the characteristics that the data transmission rate is very high, the maximum speed can reach 10Mbps, the RS485 bus adopts the combination of a balancer drive and a differential receiver, the industrial module interference resistance is enhanced, and the noise interference resistance level is also obviously improved. The actual maximum transmission distance of the RS485 bus is up to 3000 meters, 128 receivers are allowed to be connected at the same time, the multi-station capability is achieved, a user can lay the whole network by means of a single RS485 interface device, however, in the communication process of the whole bus, only a single node can send information, other devices can only receive information selectively, and the multi-station wireless communication system has great limitation. The RS485 interface forms a half-duplex network, and generally only two connecting wires are needed, so that the interfaces of the RS485 network all adopt shielded twisted pair transmission. The CAN bus communication mode has the greatest advantages of very long transmission distance up to 10KM and high transmission speed up to 1 Mhzbps. The data transmission signal of the CAN bus is stable, the loss is small, and the CAN bus is not easily interfered by the outside. The CAN bus CAN have 110 nodes at most, the number of the nodes CAN be conveniently expanded, the CAN bus nodes with errors CAN automatically cut off the connection with the bus, the communication of the whole bus is not influenced, whether the message is sent successfully or not CAN be automatically detected, the hardware CAN automatically retransmit, the transmission reliability is high, the structure is simple, and the cost performance is good. The communication mode that adopts CAN module and RS485 module to combine together CAN complement well, has promoted communication processor's communication effect.
And an isolated power supply 903 connected with the communication processor 902 and used for supplying power to the communication processor.
The isolated power supply can adopt 1: 1, so, no matter which line of circuit is touched by operating personnel, no electric shock danger can not exist because the isolation power supply is not connected with the ground.
In industrial control equipment, power supply ground wire isolation between two systems is sometimes required, such as ground wire noise isolation, high common mode voltage isolation and the like, and a direct current converter with a transformer is adopted to isolate two power supplies so as to enable the two power supplies to be mutually independent, thereby achieving the purposes. Each module supplies power independently, prevents that a module from being damaged and other modules are damaged due to high-voltage discharge or other reasons, and the purpose of doing so can guarantee that each module independently works and is not disturbed.
In some optional embodiments, as shown in fig. 10, a schematic structural diagram of a fifth three-phase alternating current energy collecting apparatus 1000 in this embodiment is different from that in fig. 9, further including: a branch electric energy collector 1001, a signal input controller 1002 and a signal output controller 1003.
The branch power collector 1001 is connected to a branch electrical signal input terminal of the power central processor 901, and respectively collects branch voltage and branch current through the branch voltage collector and the branch current collector to obtain branch power data, and transmits the branch power data to the power central processor.
The electric energy central processor 901 processes the received branch electric energy data according to a preset branch electric signal processing strategy, and outputs the branch electric energy data through the communication processor.
And the signal input controller 1002 is connected with the switching value input end 1004 of the electric energy center processor, and receives and executes the control command of the external controller.
And the signal output controller 1003 is connected with a relay output end 1005 of the electric energy central processor and generates a control instruction according to a preset trigger strategy to control the on-off of the signal output controller. Alternatively, the switching value input terminal may be a dry contact switching value input; the output end of the relay can be the output of a dry contact relay, and the individual requirements can be met.
In some optional embodiments, as shown in fig. 11 and 12, fig. 11 is a circuit schematic diagram of a three-phase ac electric energy collector in an embodiment of the present invention, and fig. 12 is a circuit schematic diagram of a three-phase ac electric energy collecting and processing system in an embodiment of the present invention. In the figure, voltage is acquired by directly acquiring voltage from a live wire and a zero line in a resistance voltage division mode, in order to enable a circuit board of an acquisition circuit to be compatible with alternating current of different zero lines, a mode of no common zero line is adopted, each zero line and a circuit board chip are isolated by connecting 5 resistors in series in a common ground, preferably, 5 resistors of 300K are isolated in series, and therefore three-phase power supply circuit chips work on one circuit board simultaneously and do not influence each other. In the figure, a main chip is communicated with 12 metering chips HT7038 and 1 metering chip ATT7022E through an SPI bus and chip selection control pins of each chip, and the HT7038 mainly collects voltage, current, power and electric energy of each branch. The ATT7022E mainly collects the voltage, current, power and electric energy of three-phase power and analyzes and monitors the electric energy quality of the three-phase power. Carry out the communication through CAN module and RS485 and outside, pass away the data of gathering, wherein CAN and RS 485's power all is keeping apart the power supply chip power supply, keeps apart weak current and forceful electric power, ensures the security.
The method and the device for acquiring the three-phase alternating current electric energy have the following beneficial effects:
(1) the method and the device for collecting the three-phase alternating current energy have the advantages that the voltage is directly collected from the live wire and the zero line in a resistance voltage division mode, alternating currents of different zero lines can be compatible in a mode of not sharing the zero line, each zero line is isolated from the grounding wire through the voltage division isolator, the problem that a three-phase power supply chip works on one circuit board simultaneously and does not influence each other is solved, multiple paths of three-phase electric energy data can be collected simultaneously through one PCB, each path of three-phase electric energy data is not interfered and can be isolated, and the three-phase electric energy collection efficiency is improved.
(2) According to the method and the device for collecting the three-phase alternating current electric energy, the branch electric energy collector collects the voltage, the current, the power and other electric energy data of each branch, the three-phase electric energy collection processor collects the voltage, the current, the power and other electric energy of the three-phase alternating current, the electric energy quality of the three-phase electric energy can be analyzed and monitored, the communication processor communicates with the outside, the collected data are transmitted, and the function of remotely controlling the collection of the three-phase alternating current electric energy is achieved.
(3) According to the method and the device for three-phase alternating current energy collection, the isolation power supply is used for supplying power to the communication processor, weak current and strong current are isolated, the safety of three-phase electric energy collection is guaranteed, the device is further provided with the dry contact switch value input end and the dry contact relay output end, personalized requirements can be met, and the flexibility of three-phase alternating current energy collection control is improved.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (6)

1. A method for collecting three-phase alternating current energy is characterized by being used for monitoring multi-path three-phase alternating current electric energy simultaneously; the method for collecting the three-phase alternating current electric energy comprises the following steps:
in the three-phase alternating current energy collector, a voltage receiving end of each phase in the voltage collector is respectively connected with voltage collecting ends of a live wire and a zero wire of each phase in the three-phase alternating current, a voltage signal output end of the voltage collector is connected with a three-phase alternating current energy collecting processor, and a voltage division isolator is arranged between the voltage receiving end and the voltage signal output end of each line;
connecting a current receiving end of each phase in a current collector with a current collecting end of each phase in three-phase alternating current respectively, connecting a current signal output end of the current collector with a three-phase alternating current energy collecting processor, and arranging a shunt isolator between the current receiving end and the current signal output end of each line;
performing analog-digital processing on the three-phase alternating current voltage signals acquired by the voltage acquisition unit and the three-phase alternating current signals acquired by the current acquisition unit through the three-phase alternating current energy acquisition processor to obtain three-phase alternating current energy data of the three-phase alternating current;
connecting one or more paths of three-phase alternating current energy collectors to a three-phase alternating current signal input end of an electric energy center processor;
the electric energy central processor receives the three-phase alternating current electric energy data, processes the three-phase alternating current electric energy data according to a preset three-phase alternating current signal processing strategy and outputs the three-phase alternating current electric energy data through the communication processor;
supplying power to the communication processor by using an isolated power supply;
respectively acquiring branch voltage and branch current by using a branch voltage collector and a branch current collector of a branch electric energy collector to obtain branch electric energy data, and transmitting the branch electric energy data to the electric energy central processor;
the electric energy central processor receives the branch electric energy data, processes the branch electric energy data according to a preset branch electric signal processing strategy, and outputs the branch electric energy data through the communication processor;
the switching value input end of the electric energy central processor is connected with the signal input controller, receives a control instruction of the external controller and executes the control instruction; and the relay output end of the electric energy central processor is connected with the signal output controller, and generates a control instruction according to a preset trigger strategy to control the on-off of the signal output controller.
2. The method of claim 1, comprising: in the partial pressure isolator, a first partial pressure is generated,
connecting more than or equal to one voltage dividing resistor in series to form a voltage dividing unit, and connecting the voltage dividing unit and a voltage dividing isolation resistor in series and then connecting the voltage dividing unit and a voltage dividing grounding wire;
connecting two ends of the voltage division unit with the voltage receiving end and the voltage signal output end respectively;
and a voltage division isolation capacitor is connected in parallel with the voltage division isolation resistor between the voltage division unit and the voltage division grounding wire to form an isolation unit.
3. The method of claim 1, comprising: in the case of the shunt isolator described above,
connecting more than or equal to one shunt resistor in parallel to form a shunt unit, and respectively connecting two ends of the shunt unit with the current receiving end and the current signal output end;
connecting one end of a shunt isolation resistor between the current receiving end and the shunt unit, and connecting the other end of the shunt isolation resistor with a shunt grounding wire;
and one end of the shunt isolation capacitor is connected between the shunt unit and the current signal output end, and the other end of the shunt isolation capacitor is connected between the shunt isolation resistor and the shunt grounding wire.
4. The device for collecting the three-phase alternating current energy is characterized by being used for monitoring multiple paths of three-phase alternating current energy simultaneously; the device for collecting the three-phase alternating current electric energy comprises: the device comprises a voltage collector, a current collector, a three-phase alternating current electric energy collection processor, an electric energy central processor, a communication processor, an isolation power supply, a branch electric energy collector, a signal input controller and a signal output controller; wherein the content of the first and second substances,
in the voltage collector, a voltage receiving end of each phase is respectively connected with voltage collecting ends of a live wire and a zero wire of each phase in three-phase alternating current, a voltage signal output end is connected with the three-phase alternating current energy collecting processor, and a voltage division isolator is arranged between the voltage receiving end and the voltage signal output end of each line;
in the current collector, a current receiving end of each phase is respectively connected with a current collecting end of each phase in three-phase alternating current, a current signal output end is connected with the three-phase alternating current energy collecting processor, and a shunt isolator is arranged between the current receiving end of each line and the current signal output end;
the three-phase alternating current energy acquisition processor is respectively connected with the voltage collector and the current collector, and performs analog-digital processing on the three-phase alternating current voltage signals collected by the voltage collector and the three-phase alternating current signals collected by the current collector to obtain three-phase alternating current energy data of the three-phase alternating current;
in the electric energy central processor, a three-phase alternating current signal input end is connected with one or more paths of three-phase alternating current electric energy collectors, and the received three-phase alternating current electric energy data are processed according to a preset three-phase alternating current signal processing strategy to obtain three-phase alternating current communication data;
the communication processor is connected with the communication output end of the electric energy center processor, and is used for receiving and outputting the three-phase alternating current communication data;
the isolation power supply is connected with the communication processor and supplies power to the communication processor;
the branch electric energy collector is connected with a branch electric signal input end of the electric energy central processor, and respectively collects branch voltage and branch current through the branch voltage collector and the branch current collector to obtain branch electric energy data, and transmits the branch electric energy data to the electric energy central processor;
the electric energy central processor receives the branch electric energy data, processes the branch electric energy data according to a preset branch electric signal processing strategy, and outputs the branch electric energy data through the communication processor;
the signal input controller is connected with the switching value input end of the electric energy central processor, receives a control instruction of an external controller and executes the control instruction;
and the signal output controller is connected with the relay output end of the electric energy central processor and generates a control instruction according to a preset trigger strategy to control the on-off of the signal output controller.
5. The apparatus for three-phase AC power collection according to claim 4, wherein the voltage division isolator comprises: the voltage division unit, the voltage division isolation resistor and the voltage division isolation capacitor are arranged in the circuit board; wherein the content of the first and second substances,
the voltage dividing unit comprises more than or equal to one serial voltage dividing resistor, and two ends of the voltage dividing unit are respectively connected with the voltage receiving end and the voltage signal output end;
one end of the voltage division isolation resistor is connected with the voltage division unit in series, and the other end of the voltage division isolation resistor is connected with a voltage division grounding wire;
the voltage division isolation capacitor is connected between the voltage division unit and the voltage division grounding wire in parallel with the voltage division isolation resistor to form an isolation unit.
6. The apparatus of claim 4, wherein the shunt isolator comprises: the shunt unit, the shunt isolation resistor and the shunt isolation capacitor are connected in series; wherein the content of the first and second substances,
the shunt unit comprises more than or equal to one shunt resistor in parallel, and two ends of the shunt unit are respectively connected with the current receiving end and the current signal output end;
one end of the shunt isolation resistor is connected between the current receiving end and the shunt unit, and the other end of the shunt isolation resistor is connected with a shunt grounding wire;
one end of the shunt isolation capacitor is connected between the shunt unit and the current signal output end, and the other end of the shunt isolation capacitor is connected between the shunt isolation resistor and the shunt grounding wire.
CN201910619120.2A 2019-07-10 2019-07-10 Method and device for collecting three-phase alternating current energy Active CN110308324B (en)

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CN102495279A (en) * 2011-12-23 2012-06-13 无锡博欧电子科技有限公司 Metering device for multipath alternating current electric quantities
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