CN214479612U - Device for realizing automatic phase sequence correction by adopting multi-path selector - Google Patents
Device for realizing automatic phase sequence correction by adopting multi-path selector Download PDFInfo
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- CN214479612U CN214479612U CN202022904951.5U CN202022904951U CN214479612U CN 214479612 U CN214479612 U CN 214479612U CN 202022904951 U CN202022904951 U CN 202022904951U CN 214479612 U CN214479612 U CN 214479612U
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Abstract
The utility model relates to an electric power monitor terminal's installation wiring technical field, concretely relates to adopt multiplexer to realize phase sequence automatic correction's device. The electric power monitoring terminal comprises a metering chip, an MCU management module and a multiplexer, wherein the metering chip is arranged in the electric power monitoring terminal and used for monitoring electric power system parameters, the MCU management module is used for processing monitoring data of the metering chip, the multiplexer is used for switching and correcting phase sequence of an electric power sampling circuit accessed to the electric power monitoring terminal, the MCU management module is respectively connected with the metering chip and the multiplexer, and the electric power sampling circuit is connected with the metering chip through the multiplexer. The utility model provides a problem of the reverse preface of voltage or the reverse preface of electric current that terminal installation wiring mistake leads to in the complete sets electrical cabinet, need not have a power failure to handle when switching the correction, the reverse preface of terminal automatic identification, the automatic correction of the reverse preface is accomplished to the matching current circuit.
Description
Technical Field
The utility model relates to an electric power monitor terminal's installation wiring technical field, concretely relates to adopt multiplexer to realize phase sequence automatic correction's device.
Background
In a distribution room such as a public transformer or a special transformer, terminal equipment (hereinafter referred to as a power monitoring terminal, for short, a terminal) such as a power instrument and a smart electric energy meter is matched and installed in a complete equipment electric appliance cabinet, so that the requirements of monitoring power grid parameters such as voltage, current and power and measuring electric energy can be conveniently met. The high-voltage cabinet, the secondary main cabinet, the transformer cabinet, the metering cabinet and the drawer cabinets of all branch loops are all provided with terminals accessed through mutual inductors, the power grid line is complex under the field condition, and the problem can be solved only by re-wiring in a power failure mode if the reverse phase sequence of voltage is found after the terminals are installed. In some sites where electricity usage is severe, power outages are not allowed, and this problem cannot be dealt with properly.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an adopt multiplexer to realize device of phase sequence automatic correction aims at solving the problem of the reverse preface of voltage or the reverse preface of electric current that terminal installation wiring error leads to in the complete sets electrical cabinet, does not need the power failure to handle when switching the correction, and the reverse preface of terminal automatic identification matches the automatic correction of the reverse preface of electric current circuit completion. The specific technical scheme is as follows:
a device for realizing automatic phase sequence correction by adopting a multiplexer comprises a metering chip, an MCU (microprogrammed control unit) management module and a multiplexer, wherein the metering chip is arranged in an electric power monitoring terminal and used for monitoring parameters of an electric power system, the MCU management module is used for processing monitoring data of the metering chip, the multiplexer is used for switching and correcting the phase sequence of an electric power sampling circuit connected to the electric power monitoring terminal, the MCU management module is respectively connected with the metering chip and the multiplexer, and the electric power sampling circuit is connected with the metering chip through the multiplexer; the electric power monitoring terminal comprises an electric energy meter and is arranged in the complete equipment electric appliance cabinet; the complete equipment electrical cabinet comprises a high-voltage cabinet, a secondary main cabinet, a transformer cabinet, a metering cabinet and drawer cabinets of all branch loops of the power system.
As one of the preferable schemes of the connection relationship between the power sampling circuit and the multiplexer of the present invention, the power sampling circuit includes three phase voltage lines VA, VB, VC and a neutral voltage line VN, and three phase current lines Ia, Ib, Ic corresponding to the three phase voltage lines VA, VB, VC; the phase voltage lines VA, VB and VC and the neutral voltage line VN are connected with the metering chip through the multiplexer; and the MCU management module reads the voltage, current and phase angle relation of the metering chip to judge whether the phase sequences are matched, and when the reverse phase sequence condition that the phase sequences are not matched occurs, the MCU management module sends a channel switching command to the multiplexer so as to realize the automatic switching correction of the reverse phase sequence of the voltage.
As a second preferred embodiment of the connection relationship between the middle power sampling circuit and the multiplexer of the present invention, the power sampling circuit includes three phase voltage lines VA, VB, VC and a neutral voltage line VN, and three phase current lines Ia, Ib, Ic corresponding to the three phase voltage lines VA, VB, VC; the phase current lines Ia, Ib and Ic are connected with the metering chip through the multiplexer; and the MCU management module reads the voltage, current and phase angle relation of the metering chip to judge whether the phase sequences are matched, and when the reverse phase sequence condition that the phase sequences are not matched occurs, the MCU management module sends a channel switching command to the multiplexer so as to realize the automatic switching correction of the current reverse phase sequence.
Further, the multiplexers may be set into two groups, one group of the multiplexers is connected to the three phase voltage lines VA, VB, VC and the neutral voltage line VN, the other group of the multiplexers is connected to the phase current lines Ia, Ib, Ic, and the MCU management module realizes the flexible switching of the phase sequence according to the different conditions and wiring requirements of the power line monitored by the metering chip.
Preferably, the multiplexer is provided with N access ports, N output ports and a set of control interface, the MCU management module is connected with the control interface of the multiplexer, the power sampling circuit is connected with the access ports of the multiplexer, and the output ports of the multiplexer are connected with the metering chip.
Preferably, the number N of the ports of the multiplexer is more than or equal to 4.
The utility model discloses in, the electric power sampling circuit pass through the mutual-inductor with electric power system is connected.
A phase sequence automatic correction method of a device for realizing phase sequence automatic correction by adopting a multiplexer comprises the following steps:
(1) a multiplexer which is respectively connected with the metering chip and the MCU management module is arranged in the power monitoring terminal;
(2) the electric power system converts electric power parameter information of the electric power system to an electric power sampling circuit through a mutual inductor, and the electric power sampling circuit is connected to a multi-way selector of an electric power monitoring terminal;
(3) and the MCU management module reads the voltage, current and phase angle relation of the metering chip to judge whether the phase sequences are matched, and when the reverse phase sequence condition that the phase sequences are not matched occurs, the MCU management module sends a channel switching command to the multiplexer so as to realize automatic switching correction of the reverse phase sequence.
Wherein, the automatic switching correction of the reverse phase sequence can adopt any one of the following three switching modes:
(a) independently carrying out automatic switching correction of the voltage reverse phase sequence;
(b) independently carrying out automatic switching correction of the current reverse phase sequence;
(c) and simultaneously carrying out automatic switching correction on the voltage reverse phase sequence and the current reverse phase sequence.
The utility model has the advantages that:
first, the utility model discloses an adopt multiplexer to realize device of phase sequence automatic correction, through the multiplexer who sets up the connection measurement chip in electric power monitor terminal, realized the automated inspection and the automatic switch-over correction of voltage electric current phase sequence to reverse order of voltage or the reverse order automatic adjustment of electric current are correct phase sequence, and need not to have a power failure when switching the correction, have satisfied the harsh on-the-spot installation condition of power consumption condition from this.
Second, the utility model discloses an adopt multiplexer to realize phase sequence automatic correction's device both can realize the independent switching of voltage phase sequence, also can realize the independent switching of electric current phase sequence, can realize switching when voltage phase sequence and electric current phase sequence again simultaneously to the adaptability to special wiring requirement under the different electric power system scenes has been strengthened at electric power monitoring terminal.
Third, the utility model discloses an adopt multiplexer to realize phase sequence automatic correction's device has realized the seamless switching that does not have a power failure of electric power sampling circuit phase sequence through the multiplexer, and has advantages such as low power dissipation, switch steadily, security good reliability through the multiplexer switching.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for implementing automatic phase sequence correction by using a multiplexer according to the present invention;
FIG. 2 is a schematic diagram of the multiplexer of FIG. 1;
fig. 3 is a schematic diagram of a three-phase four-wire power system connected to a power monitoring terminal (inside a rounded dotted line frame) via a current transformer access connection (power sampling line).
In the figure: 10. the system comprises a power monitoring terminal 20, an MCU management module 30, a multiplexer 40 and a metering chip;
in the figure: VA, VB and VC are three phase voltage lines of the power sampling circuit, and a voltage neutral line of the VN power sampling circuit;
in the figure: va, Vb and Vc are access pins which are used for accessing three phase voltage lines on the metering chip, and Vn is used for accessing an access pin of a voltage neutral line;
in the figure: ia. Ib and Ic are three phase current lines corresponding to VA, VB and VC,
in the figure: in1, In2 and In3 are access ports of the multiplexer, and Out1, Out2 and Out3 are output ports of the multiplexer.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1:
fig. 1 to 3 show an embodiment of a device for implementing automatic phase sequence correction by using a multiplexer according to the present invention, which includes a metering chip 40 disposed in an electric power monitoring terminal 10 for monitoring parameters of an electric power system, an MCU management module 20 for processing monitoring data of the metering chip 40, and a multiplexer 30 for switching and correcting phase sequences of an electric power sampling line connected to the electric power monitoring terminal, wherein the MCU management module 20 is respectively connected to the metering chip 40 and the multiplexer 30, and the electric power sampling line is connected to the metering chip 40 through the multiplexer 30; the electric power monitoring terminal 10 comprises an electric energy meter, and the electric power monitoring terminal 10 is installed in a complete equipment electric appliance cabinet; the complete equipment electrical cabinet comprises a high-voltage cabinet, a secondary main cabinet, a transformer cabinet, a metering cabinet and drawer cabinets of all branch loops of the power system.
As one of the preferable schemes of the connection relationship between the power sampling circuit and the multiplexer of the present invention, the power sampling circuit includes three phase voltage lines VA, VB, VC and a neutral voltage line VN, and three phase current lines Ia, Ib, Ic corresponding to the three phase voltage lines VA, VB, VC; the phase voltage lines VA, VB and VC and the neutral voltage line VN are connected with the metering chip through the multiplexer; the MCU management module 20 reads the voltage, current and phase angle relationship of the metering chip to determine whether the phase sequence is matched, and when the negative phase sequence condition of phase sequence mismatch occurs, the MCU management module 20 sends a channel switching command to the multiplexer 30 to implement automatic switching correction of the negative phase sequence of voltage.
As a second preferred embodiment of the connection relationship between the middle power sampling circuit and the multiplexer of the present invention, the power sampling circuit includes three phase voltage lines VA, VB, VC and a neutral voltage line VN, and three phase current lines Ia, Ib, Ic corresponding to the three phase voltage lines VA, VB, VC; the phase current lines Ia, Ib, Ic are connected to the metering chip 40 through the multiplexer 30; the MCU management module 20 reads the voltage, current and phase angle relationship of the metering chip 40 to determine whether the phase sequences are matched, and when the negative phase sequence condition of phase sequence mismatch occurs, the MCU management module 20 sends a channel switching command to the multiplexer 30 to realize automatic switching correction of the negative phase sequence of current.
Further, the multiplexers 30 may be set into two groups, one group of the multiplexers is connected to the three phase voltage lines VA, VB, VC and one neutral voltage line VN, and the other group of the multiplexers is connected to the phase current lines Ia, Ib, Ic, and the MCU management module 20 implements the flexible switching of the phase sequence according to the different conditions and wiring requirements of the power line monitored by the metering chip 40.
Preferably, the multiplexer 30 is respectively provided with N access ports, N output ports and a group of control interfaces, the MCU management module 20 is connected to the control interfaces of the multiplexer 30, the power sampling circuit is connected to the access ports of the multiplexer 30, and the output ports of the multiplexer 30 are connected to the metering chip 40.
Preferably, the number N of ports of the multiplexer 30 is greater than or equal to 4.
The utility model discloses in, the electric power sampling circuit pass through the mutual-inductor with electric power system is connected.
Example 2:
as shown in fig. 1, the power monitoring terminal 10 includes an MCU management module 20, a multiplexer 30 and a metering chip 40, and particularly, the multiplexer 30 reads the voltage, current and phase angle relationship of the metering chip 40 according to the MCU management module 20, and the program determines the phase sequence relationship among VA, VB, VC, Ia, Ib and Ic, if the phase sequence is not matched, the terminal is in the reverse voltage sequence state. At this time, the MCU management module 20 sends a channel switching command to the multiplexer 30, and adjusts the channels of VA, VB, and VC to match the channels of VA, VB, and VC, thereby implementing automatic switching of reverse sequence.
Further, as shown In fig. 2, the multiplexer 30 includes three In access ports, three Out access ports and a set of control interfaces, wherein the control interfaces are In the form of SPI interfaces, and may also be In the form of I interfaces2And C interface form. The three-way In access port and the three-way Out access port are switched on In a default state 11, 22 and 33, and the truth table thereof is shown In the following table 1. Meanwhile, the built-In access port and the Out output port of the multiplexer have self-locking mutual exclusion functions, and the built-In access port and the Out output port of the multiplexer cannot have a self-locking mutual exclusion module which is connected with one path at the same time, and cannot have connection modes such as 11 and 21.
TABLE 1 multiplexer truth table
Note: x is 0 or 1, data is invalid, and the on pin is in a default state.
Example 3: automatic correction of reverse order caused by reversal of terminal connections A and C
Fig. 3 shows that three-phase four-wire is connected to a terminal (a part inside a rounded dotted line frame) through a current transformer access type connection (a power sampling line), the correct connection method is VA → 2 and VC → 8, and in the construction process, due to artificial reasons, input VA and VC are reversely connected and become VC → 2 and VA → 8. After the power supply is put into use, the default connection mode of the multiplexer of the terminal MCU management module is VA → 8 → In3 → Out 3-Vc, VC → 2 → In1 → Out 1-Va, and the terminal MCU management module detects the voltage reverse sequence.
Meanwhile, the terminal MCU management module detects that the current line is normal, sends a command shown In a sequence number 5 In a table 1, completes switching of the voltage sampling line, and has a switching-on mode of VA → 8 → In3 → Out1 → Va, VC → 2 → In1 → Out3 → Vc, and completes correction of a voltage reverse sequence and enables the terminal to operate correctly.
Example 4:
a phase sequence automatic correction method using the apparatus for realizing phase sequence automatic correction using a multiplexer of embodiment 1, comprising the steps of:
(1) a multiplexer 30 which is respectively connected with a metering chip 40 and the MCU management module 20 is arranged in the power monitoring terminal 10;
(2) the electric power system converts the electric power parameter information of the electric power system to an electric power sampling line through a mutual inductor, and the electric power sampling line is connected to a multiplexer 30 of the electric power monitoring terminal 10;
(3) the MCU management module 20 reads the voltage, current and phase angle relationship of the metering chip 40 to determine whether the phase sequences are matched, and when the negative phase sequence condition of phase sequence mismatch occurs, the MCU management module 20 sends a channel switching command to the multiplexer 30 to realize automatic switching correction of the negative phase sequence.
Wherein, the automatic switching correction of the reverse phase sequence can adopt any one of the following three switching modes:
(a) independently carrying out automatic switching correction of the voltage reverse phase sequence;
(b) independently carrying out automatic switching correction of the current reverse phase sequence;
(c) and simultaneously carrying out automatic switching correction on the voltage reverse phase sequence and the current reverse phase sequence.
The foregoing is only 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 technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A device for realizing automatic phase sequence correction by adopting a multiplexer is characterized by comprising a metering chip, an MCU (microprogrammed control unit) management module and a multiplexer, wherein the metering chip is arranged in an electric power monitoring terminal and used for monitoring parameters of an electric power system, the MCU management module is used for processing monitoring data of the metering chip, the multiplexer is used for switching and correcting the phase sequence of an electric power sampling circuit connected to the electric power monitoring terminal, the MCU management module is respectively connected with the metering chip and the multiplexer, and the electric power sampling circuit is connected with the metering chip through the multiplexer; the electric power monitoring terminal comprises an electric energy meter and is arranged in the complete equipment electric appliance cabinet; the complete equipment electrical cabinet comprises a high-voltage cabinet, a secondary main cabinet, a transformer cabinet, a metering cabinet and drawer cabinets of all branch loops of the power system.
2. The device for realizing automatic phase sequence correction by using the multiplexer according to claim 1, wherein the power sampling circuit comprises three phase voltage lines VA, VB and VC and a neutral voltage line VN, and three phase current lines Ia, Ib and Ic corresponding to the three phase voltage lines VA, VB and VC; the phase voltage lines VA, VB and VC and the neutral voltage line VN are connected with the metering chip through the multiplexer; and the MCU management module reads the voltage, current and phase angle relation of the metering chip to judge whether the phase sequences are matched, and when the reverse phase sequence condition that the phase sequences are not matched occurs, the MCU management module sends a channel switching command to the multiplexer so as to realize the automatic switching correction of the reverse phase sequence of the voltage.
3. The device for realizing automatic phase sequence correction by using the multiplexer according to claim 1, wherein the power sampling circuit comprises three phase voltage lines VA, VB and VC and a neutral voltage line VN, and three phase current lines Ia, Ib and Ic corresponding to the three phase voltage lines VA, VB and VC; the phase current lines Ia, Ib and Ic are connected with the metering chip through the multiplexer; and the MCU management module reads the voltage, current and phase angle relation of the metering chip to judge whether the phase sequences are matched, and when the reverse phase sequence condition that the phase sequences are not matched occurs, the MCU management module sends a channel switching command to the multiplexer so as to realize the automatic switching correction of the current reverse phase sequence.
4. The device for realizing automatic phase sequence correction by adopting the multiplexers according to claim 2 or 3, wherein the multiplexers are arranged into two groups, one group of the multiplexers is connected with three phase voltage lines VA, VB and VC and one neutral voltage line VN, the other group of the multiplexers is connected with phase current lines Ia, Ib and Ic, and the MCU management module realizes flexible switching of the phase sequence according to different conditions and wiring requirements of the power line monitored by the metering chip.
5. The device according to claim 1, wherein the multiplexer is provided with N access ports, N output ports, and a set of control interfaces, the MCU management module is connected to the control interfaces of the multiplexer, the power sampling circuit is connected to the access ports of the multiplexer, and the output ports of the multiplexer are connected to the metering chip.
6. The device for realizing automatic phase sequence correction by using the multiplexer according to claim 5, wherein the number N of the ports of the multiplexer is greater than or equal to 4.
7. The apparatus of claim 1, wherein the power sampling circuit is connected to the power system through a transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022904951.5U CN214479612U (en) | 2020-12-07 | 2020-12-07 | Device for realizing automatic phase sequence correction by adopting multi-path selector |
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| CN202022904951.5U CN214479612U (en) | 2020-12-07 | 2020-12-07 | Device for realizing automatic phase sequence correction by adopting multi-path selector |
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| CN214479612U true CN214479612U (en) | 2021-10-22 |
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