CN211374881U - Metering device and terminal metering device of three-phase electrical parameter - Google Patents
Metering device and terminal metering device of three-phase electrical parameter Download PDFInfo
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- CN211374881U CN211374881U CN201921124534.XU CN201921124534U CN211374881U CN 211374881 U CN211374881 U CN 211374881U CN 201921124534 U CN201921124534 U CN 201921124534U CN 211374881 U CN211374881 U CN 211374881U
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Abstract
The utility model provides a metering device for three-phase electrical parameters, which comprises three processors corresponding to three-phase input electricity, three electrical parameter sampling modules corresponding to the three-phase input electricity and a power module; the processors are connected through a serial bus, and simultaneously, each processor is respectively and electrically connected with one electrical parameter sampling module, and the power supply module is electrically connected with the processors in a parallel mode; each electrical parameter sampling module comprises a mutual inductor current sampling circuit, a line voltage sampling circuit and a phase voltage sampling circuit; the mutual inductor of the mutual inductor current sampling circuit comprises at least two frameworks of which the inner parts are cavities, wherein intervals are arranged between the frameworks and the frameworks are connected through alloy sheets, each framework is provided with a winding, and the windings and the alloy sheets form a closed magnetic loop. The embodiment of the utility model provides a pair of metering device and terminal metering device of three-phase electrical parameter can realize that the electric quantity metering device is miniaturized, occupies the block terminal space still less.
Description
Technical Field
The utility model belongs to the technical field of the electric quantity measurement technique and specifically relates to a metering device and terminal metering device of three-phase electrical parameter are related to.
Background
With the development of modern industry, the power consumption is continuously increased, related electric appliances for monitoring the power consumption are also continuously upgraded, and the electric meter for acquiring and monitoring electric parameters is widely applied to an SCADA (supervisory control and data acquisition) system and an energy efficiency management system. At present, the existing electric meter installed at the tail end of a distribution box generally adopts a guide rail type installation mode and carries out data transmission in a wired connection mode; for the measurement of the electrical parameters, a voltage transformer is adopted to measure the voltage, and the current parameters are collected through a current transformer or a manganin resistor. However, due to the structural design of the large-size power frequency transformer inside the electric meter and the AC/DC power circuit with a complex structure in the electric meter, the electric meter is large in size and occupies more space of the distribution box.
SUMMERY OF THE UTILITY MODEL
The utility model provides a metering device and terminal metering device of three-phase electrical parameter, on satisfying the basis that the electric quantity measurement required, optimize the mutual-inductor structure in order to reduce the volume of mutual-inductor to make the inner structure of electric quantity measurement device compacter, in order to realize that the electric quantity measurement device is miniaturized, and then less block terminal space occupies. The technical scheme is as follows:
the embodiment of the utility model provides a metering device of three-phase electrical parameter, including three treater, three electrical parameter sampling module and the power module that correspond three-phase input electricity;
the processors are connected through a serial bus, and simultaneously, each processor is respectively and electrically connected with one electrical parameter sampling module, and the power supply module is electrically connected with the processors in a parallel mode;
each electrical parameter sampling module comprises a mutual inductor current sampling circuit, a line voltage sampling circuit and a phase voltage sampling circuit;
the mutual inductor of the mutual inductor current sampling circuit comprises at least two frameworks of which the inner parts are cavities, wherein intervals are arranged between the frameworks and the frameworks are connected through alloy sheets, each framework is provided with a winding, and the windings and the alloy sheets form a closed magnetic loop.
Preferably, the number of the frameworks and the number of the alloy sheets are two, and two ends of one framework are respectively connected with two ends of the other framework through one alloy sheet to form an annular transformer.
Preferably, the metering device of the three-phase electrical parameters further comprises a shell, and the shell is provided with a through hole penetrating through the metering device of the three-phase electrical parameters; the processor, the power module, and the electrical parameter sampling module are all located within the housing.
Preferably, the metering device of the three-phase electrical parameters further comprises a conductor connector for energizing an external power source, the conductor connector extending from inside the housing through the through hole to outside the housing.
Preferably, the shell further comprises a circuit board, the circuit board is provided with a through hole penetrating through the board surface of the circuit board and communicated with the through hole of the shell, and the circuit board is electrically connected with the conductor connecting piece;
the processor, the power module and the electrical parameter sampling module set up in the circuit board, and the circuit board be equipped with be used for with the link that the mutual-inductor is connected.
Preferably, the power module is a resistance-capacitance step-down power circuit, and the processor is a low-power microprocessor.
Preferably, the line voltage sampling circuit and the phase voltage sampling circuit are both resistance voltage division sampling circuits.
Preferably, the metering device of the three-phase electrical parameters further comprises a power failure detection circuit, an input end of the power failure detection circuit is connected with a power output end of the power module, and an output end of the power failure detection circuit is connected with a power input end of a main processor in the three processors.
Preferably, the metering device of the three-phase electrical parameters further comprises a wireless communication circuit, and the wireless communication circuit is connected with the communication end of the main processor.
The embodiment of the utility model provides a three-phase electrical parameter's terminal metering device, include: air switches, electrical wires and metering devices for three-phase electrical parameters as described above;
the conductor connecting piece of the three-phase electric parameter metering device is inserted into the wire inserting hole of the air switch so as to connect the three-phase electric parameter metering device with the air switch;
the electric wire penetrates through the metering device of the three-phase electric parameters and is inserted into the wire inserting hole of the air switch.
Compared with the prior art, the embodiment of the utility model provides a have following beneficial effect:
the utility model provides a metering device of three-phase electrical parameter is formed by treater, power module and electrical parameter sampling module equipment, wherein, adopts the mutual inductive current sampling mode to sample input current to measure relevant electrical parameter, including electric current virtual value etc. reach the effect of accurate, measure electrical parameter high-efficiently. In order to avoid the defect that the volume of a transformer in the traditional transformer current sampling mode is large, which causes the volume of a metering device to be large, the utility model provides a transformer of the metering device of the three-phase electrical parameters, because the alloy sheet is connected on the framework, and the interior of the framework is a cavity, which plays the role of an air magnetic core, and is smaller than the traditional magnetic core, thereby reducing the whole volume of the transformer, and the magnetic conductivity in the transformer is lower, and the magnetic flux is not easy to reach the saturation point, thereby the measuring range is larger than that of the traditional current transformer; in addition, compared with the magnetic core, the alloy sheet not only occupies smaller space, but also is beneficial to enhancing the magnetic flux of air in the cavity, thereby enhancing the output of small current signals, improving the precision of the small current signals and further improving the metering precision.
The utility model provides a three-phase electrical parameter's terminal metering device is formed by air switch, electric wire and the above-mentioned metering device equipment of three-phase electrical parameter, because three-phase electrical parameter's metering device direct mount gets the electricity on air switch's terminal, is passed by the electric wire of survey circuit metering device to convenient, swiftly measure, control electrical parameter, simultaneously, because metering device direct mount need not to occupy the mounted position in the block terminal in air switch, thereby has saved the space of block terminal.
Drawings
Fig. 1 is a schematic functional block diagram of a three-phase electrical parameter metering device according to an embodiment of the present invention;
fig. 2 is a structural diagram of a mutual inductor of a three-phase electrical parameter metering device in an embodiment of the present invention;
fig. 3 is a flowchart of a power failure detection method of a three-phase electrical parameter metering device in an embodiment of the present invention;
fig. 4 is a structural diagram of a three-phase electrical parameter metering device in an embodiment of the present invention;
fig. 5 is a schematic structural split view of a three-phase electrical parameter metering device in an embodiment of the present invention;
FIG. 6 is a schematic diagram of an electrical parameter metering method of a first processor of a three-phase electrical parameter metering device in an embodiment of the present invention;
FIG. 7 is a schematic diagram of an electrical parameter metering method of a second processor of a three-phase electrical parameter metering device in an embodiment of the present invention;
FIG. 8 is a schematic diagram of an electrical parameter metering method of a third processor of a three-phase electrical parameter metering device in an embodiment of the present invention;
100, a mutual inductor; 101. a framework; 102. an alloy sheet; 103. a winding; 200. a housing; 201. a through hole; 202. an indicator light; 301. an upper plate; 302. a lower plate; 401. a conductor plate; 402. copper insert piece.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, a three-phase electrical parameter metering device according to an exemplary embodiment of the present invention is shown, which includes three processors corresponding to three-phase input electricity, three electrical parameter sampling modules corresponding to three-phase input electricity, and a power supply module;
the processors are connected through a serial bus, and simultaneously, each processor is respectively and electrically connected with one electrical parameter sampling module, and the power supply module is electrically connected with the processors in a parallel mode;
each electrical parameter sampling module comprises a mutual inductor current sampling circuit, a line voltage sampling circuit and a phase voltage sampling circuit;
the mutual inductor 100 of the mutual inductor current sampling circuit comprises at least two frameworks 101 with cavities inside, a space is arranged between the frameworks 101 and is connected through alloy sheets 102, a winding 103 is arranged on each framework 101, and the winding 103 and the alloy sheets 102 form a closed magnetic loop.
Referring to fig. 2, which illustrates a transformer 100 of a three-phase electrical parameter measuring apparatus according to an exemplary embodiment of the present invention, the number of the frameworks 101 and the number of the alloy sheets 102 are two, and two ends of one of the frameworks 101 are respectively connected to two ends of the other framework 101 through one of the alloy sheets 102, so as to form a ring-shaped transformer 100.
It can be understood that, the electrical parameter collection and calculation, because the resources and data processing capability of the monolithic microprocessor are limited, the collection and calculation are respectively performed on each phase voltage, line voltage and line current by adopting 3 MCUs, one of which is a master processor MCU1, and 2 are slave processor MCUs 2 and 3, the MCU1 reads the collection and calculation results on the slave processor MCUs 2 and 3 through serial bus communication, and uploads the data through wireless and gateway communication.
When the electric parameters are measured, the electric wires pass through the mutual inductor 100 in the metering device of the three-phase electric parameters, so that the mutual inductor 100 generates induction current, the electric parameter sampling module collects relevant parameters of the induction current, and the electric parameter sampling module transmits data obtained by collecting the induction current to the processor for processing, thereby realizing the metering of the electric parameters.
The power supply module comprises a rectifying circuit, a voltage stabilizing circuit and a direct current voltage reducing circuit;
the input end of the voltage stabilizing circuit is connected with the output end of the rectifying circuit, the output end of the voltage stabilizing circuit is connected with the input end of the direct current voltage reducing circuit, and the output end of the direct current voltage reducing circuit is connected with the power input end of the processor.
In order to further reduce the volume, the power module is a power circuit adopting a resistance-capacitance voltage reduction mode, and the processor is a low-power-consumption microprocessor; preferably, the processor is a msp430i2041 low power Microprocessor (MCU) of TI.
It can be understood that, in order to reduce the power module, a resistance-capacitance voltage reduction mode is adopted, and the power supply scheme can only provide small current for power supply, so that the whole low-power design is carried out, an msp430i2041 low-power Microprocessor (MCU) of TI is selected on a main device for data acquisition and calculation, and an operational amplifier and a 4-channel 24-bit synchronous AD acquisition circuit are built in the MCU, so that the acquisition and calculation of electrical parameters are met.
In this embodiment, the alternating current commercial power of 230V is input, and is subjected to voltage reduction and rectification by a resistor-capacitor to obtain direct current, and is subjected to voltage stabilization by a voltage stabilizer to obtain a stable voltage of 47V, and then is subjected to a DCDC power supply to convert the voltage of 47V into a supply voltage of 3.3V of a system.
In order to further reduce the size, the line voltage sampling circuit and the phase voltage sampling circuit are both resistance voltage division sampling circuits.
It can be understood that, in order to reduce the volume, the voltage measurement is performed by adopting resistance voltage division, and the voltage obtained by voltage division is acquired through the AD inside the MCU.
In this embodiment, the electrical parameter sampling module includes a current sampling circuit and a resistance voltage division sampling circuit of the transformer 100; the input end of the current sampling circuit of the mutual inductor 100 is connected with a current source, and the output end of the current sampling circuit is connected with a current acquisition signal end of the processor; the input end of the resistance voltage division sampling circuit is connected with a voltage source, and the output end of the resistance voltage division sampling circuit is connected with a voltage acquisition signal end of the processor.
The metering device of the three-phase electrical parameters further comprises a power failure detection circuit, wherein the input end of the power failure detection circuit is connected with the power supply output end of the power supply module, and the output end of the power failure detection circuit is connected with the power supply input end of a main processor in the three processors.
Referring to fig. 3, in terms of storage, due to the fact that a memory inside the MCU is used, the number of times of erasing is limited, and in order to avoid frequent data writing, the electrical magnitude is stored at the moment of power failure, therefore, a power failure detection circuit is added, and the voltage fluctuation of the front end 47V after voltage stabilization is detected by using a resistance voltage division principle, and under normal conditions, the voltage fluctuation of the 47V is not lower than 46V, so that when the divided voltage value is lower than 40V, the MCU is triggered to interrupt, and data storage is performed.
The metering device of the three-phase electrical parameters further comprises a wireless communication circuit, and the wireless communication circuit is connected with the communication end of the main processor.
It can be understood that the metering device for the three-phase electrical parameters is centrally installed in the distribution box, and in order to avoid the inconvenience of wiring of voltage, current and a communication bus, a wireless communication mode is adopted without extra wiring.
Referring to fig. 4, a three-phase electrical parameter metering device according to an exemplary embodiment of the present invention is shown, further comprising a housing 200, wherein the housing 200 is provided with a through hole 201 penetrating through the three-phase electrical parameter metering device; the processor, the power module, and the electrical parameter sampling module are disposed within the housing 200;
preferably, an indicator light 202 is disposed on the housing 200, and the indicator light 202 is electrically connected to the processor.
Preferably, the metering device of the three-phase electrical parameters further comprises a conductor connector for connecting with an external power supply, wherein the conductor connector extends from the inside of the shell 200 to the outside of the shell 200 through the through hole 201; preferably, the conductor connecting part is a copper insert 402, and the metering device of the three-phase electrical parameters is electrically connected with an external power supply through the copper insert 402.
The through holes 201 comprise a first through hole 201 and a second through hole 201;
the housing 200 is separable into a first housing 200 and a second housing 200;
when measuring the electrical parameters, one wire penetrates through the metering device of the three-phase electrical parameters through the first through hole 201, and the other wire penetrates through the metering device of the three-phase electrical parameters through the second through hole 201; the copper insert 402 is in contact with the electrical wire passing through the metering device for the three-phase electrical parameters and is connected together by the terminals on the mated air switch.
Preferably, the three-phase electrical parameter metering device comprises a circuit board for realizing the electrical parameter metering function, the circuit board is provided with a through hole penetrating through the board surface of the circuit board and communicated with the through hole 201 of the shell 200, and the circuit board is electrically connected with the conductor connecting piece (preferably a copper insert);
the processor, the power module and the electrical parameter sampling module set up in the circuit board, and the circuit board be equipped with be used for with the link that mutual-inductor 100 is connected.
It will be appreciated that when a wire enters the interior of the housing through one of the through holes, the wire passes through the annular transformer while the wire passes through the through hole of the circuit board and out of the housing through the other through hole of the housing.
Please refer to fig. 5, which illustrates a three-phase electrical parameter metering device according to an exemplary embodiment of the present invention, the three-phase electrical parameter metering device includes two circuit boards, the two circuit boards are an upper board 301 and a lower board 302, both of which are provided with through holes penetrating through board surfaces of the circuit boards and communicating with the through holes 201 of the housing 200, and the upper board 301 and the lower board 302 are electrically connected;
preferably, the upper plate 301 is connected with the lower plate 302 by a pin header connection mode;
the upper plate 301 is provided with a connecting end for connecting with the transformer 100, and the processor, the power supply module and the electrical parameter sampling module are arranged on the lower plate 302;
the transformer 100 is located between the upper plate 301 and the lower plate 302, and the annular through hole 201 of the transformer 100 is communicated with the through holes of the upper plate 301 and the lower plate 302.
The lower plate 302 is connected with the conductor connecting piece to get electricity, and simultaneously, the voltage can be measured.
Preferably, the connection terminals are pads to which the mutual inductor 100 is soldered by a conductor to achieve electrical connection.
Preferably, the housing 200 further comprises a conductor plate 401, the conductor plate 401 is provided with a through hole for passing a power supply line, and the conductor plate 401 is electrically connected with a power supply outside the metering device of the three-phase electrical parameters through the copper insertion piece 402;
the conductor plate 401 is provided with a contact spring and is electrically connected with the lower plate 302 through the contact spring.
Preferably, the conductor plate 401 is a copper plate.
When the electric wires are installed, one electric wire passes through the through hole 201 of the shell 200, the through hole of the upper plate 301, the mutual inductor 100, the through hole of the lower plate 302 and the through hole 201 of the shell 200 one by one, so as to pass through the metering device of the three-phase electric parameters; the other wire is passed through the through-hole 201 of the housing 200, the through-hole of the conductor plate 401, and the through-hole 201 of the housing 200 one by one.
An exemplary embodiment of the utility model provides a three-phase electrical parameter's terminal metering device, include: air switches, electrical wires and metering devices for three-phase electrical parameters as described above;
the copper insert 402 of the three-phase electric parameter metering device is inserted into the plug wire hole of the air switch so that the three-phase electric parameter metering device is connected with the air switch, and the shell of the three-phase electric parameter metering device is attached to one end of the plug wire hole;
the electric wire penetrates through the metering device of the three-phase electric parameters from a through hole in a shell of the metering device of the three-phase electric parameters and is inserted into a wire inserting hole of the air switch.
The utility model discloses an exemplary embodiment's a three-phase electrical parameter's terminal metering device's mounting method will be above the metering device of three-phase electrical parameter installs air switch, the step includes:
inserting the copper insert 402 of the three-phase electric parameter metering device into a wire inserting hole of an air switch;
the electric wire is inserted into the wire inserting hole through the through hole 201 of the metering device of the three-phase electric parameters;
the air switch screws are tightened to secure the wires in the wire insertion holes and the copper insert 402.
Referring to fig. 6-8, it shows an electrical parameter metering method of a three-phase electrical parameter metering device according to an exemplary embodiment of the present invention, which utilizes the above-mentioned three-phase electrical parameter metering device to perform electrical parameter metering, and includes the following specific steps:
sampling the current passing through the transformer 100 by using an electrical parameter acquisition module and simultaneously sampling the input voltage;
transmitting the sampling value to a processor to carry out metering operation of the electrical parameter;
the main processor reads the electrical parameters of the other two processors;
and outputting the electrical parameter metering value.
Wherein, the electric parameter metering value comprises a voltage effective value, a current effective value, active power, reactive power, an electric value and the like.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. The metering device of the three-phase electrical parameter is characterized by comprising three processors corresponding to three-phase input electricity, three electrical parameter sampling modules corresponding to the three-phase input electricity and a power supply module;
the processors are connected through a serial bus, and simultaneously, each processor is respectively and electrically connected with one electrical parameter sampling module, and the power supply module is electrically connected with the processors in a parallel mode;
each electrical parameter sampling module comprises a mutual inductor current sampling circuit, a line voltage sampling circuit and a phase voltage sampling circuit;
the mutual inductor of the mutual inductor current sampling circuit comprises at least two frameworks of which the inner parts are cavities, wherein intervals are arranged between the frameworks and the frameworks are connected through alloy sheets, each framework is provided with a winding, and the windings and the alloy sheets form a closed magnetic loop.
2. The three-phase electrical parameter measuring device according to claim 1, wherein the number of the skeletons and the alloy sheets is two, and two ends of one of the skeletons are respectively connected with two ends of the other skeleton through one of the alloy sheets to form a ring-shaped mutual inductor.
3. The three-phase electrical parameter metering device of claim 2, further comprising a housing having a through-hole extending through the three-phase electrical parameter metering device; the processor, the power module, and the electrical parameter sampling module are all located within the housing.
4. A three-phase electrical parameter metering device according to claim 3, further comprising a conductor connection for energizing an external power source, said conductor connection extending from within said housing through said through-hole to outside said housing.
5. The three-phase electrical parameter metering device of claim 4, further comprising a circuit board within the housing, the circuit board having a through hole extending through a face of the circuit board and communicating with the through hole of the housing, and the circuit board being electrically connected to the conductor connector;
the processor, the power module and the electrical parameter sampling module set up in the circuit board, and the circuit board be equipped with be used for with the link that the mutual-inductor is connected.
6. The three-phase electrical parameter metering device of claim 5, wherein the power module is a resistor-capacitor buck power circuit and the processor is a low power microprocessor.
7. The three-phase electrical parameter metering device of claim 5, wherein the line voltage sampling circuit and the phase voltage sampling circuit are both resistance voltage division sampling circuits.
8. The three-phase electrical parameter metering device of claim 5, further comprising a power-down detection circuit, an input of the power-down detection circuit being connected to the power output of the power module, an output of the power-down detection circuit being connected to the power input of the main processor of the three processors.
9. The three-phase electrical parameter metering device of claim 8, further comprising a wireless communication circuit coupled to the communication port of the main processor.
10. An end-of-line metering device for three-phase electrical parameters, comprising: an air switch, an electric wire and a metering device of three-phase electric parameters according to any one of claims 5 to 9;
the conductor connecting piece of the three-phase electric parameter metering device is inserted into the wire inserting hole of the air switch so as to connect the three-phase electric parameter metering device with the air switch;
the electric wire penetrates through the metering device of the three-phase electric parameters and is inserted into the wire inserting hole of the air switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921124534.XU CN211374881U (en) | 2019-07-16 | 2019-07-16 | Metering device and terminal metering device of three-phase electrical parameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921124534.XU CN211374881U (en) | 2019-07-16 | 2019-07-16 | Metering device and terminal metering device of three-phase electrical parameter |
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| Publication Number | Publication Date |
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| CN211374881U true CN211374881U (en) | 2020-08-28 |
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| CN201921124534.XU Expired - Fee Related CN211374881U (en) | 2019-07-16 | 2019-07-16 | Metering device and terminal metering device of three-phase electrical parameter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389253A (en) * | 2019-07-16 | 2019-10-29 | 广州汉光电气股份有限公司 | A kind of metering device and end metering device of three phase electrical parameters |
-
2019
- 2019-07-16 CN CN201921124534.XU patent/CN211374881U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389253A (en) * | 2019-07-16 | 2019-10-29 | 广州汉光电气股份有限公司 | A kind of metering device and end metering device of three phase electrical parameters |
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Granted publication date: 20200828 |