CN113589057B - Phase sequence switching device and method - Google Patents
Phase sequence switching device and method Download PDFInfo
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- CN113589057B CN113589057B CN202110871886.7A CN202110871886A CN113589057B CN 113589057 B CN113589057 B CN 113589057B CN 202110871886 A CN202110871886 A CN 202110871886A CN 113589057 B CN113589057 B CN 113589057B
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- 238000001514 detection method Methods 0.000 claims abstract description 16
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- 230000002159 abnormal effect Effects 0.000 claims description 18
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
Abstract
The invention provides a phase sequence switching device and a phase sequence switching method, wherein the device comprises a working power supply module, a phase sequence monitoring unit and a phase sequence control unit; the phase sequence monitoring unit comprises a voltage acquisition module and a detection switching module; the input end of the voltage acquisition module is connected with three-phase voltage; the detection switching module comprises a first pin, a second pin, a third pin and a switching connection device, the input end of the voltage acquisition module is connected with the three-phase voltage, the output end of the voltage acquisition module is connected with the switching connection device, the input end of the first pin is connected with the working power supply module, and the output end of the second pin is connected with the phase sequence control unit; the input end of the phase sequence control unit is connected with the second pin, the output end of the phase sequence control unit is connected with the working power supply module, and when the second pin outputs current, the phase sequence control unit is triggered to switch the phase sequence of the three-phase voltage. The invention can effectively monitor the phase sequence due to the phase sequence monitoring unit and the phase sequence control unit which are arranged at the input end of the three-phase power supply. The device is simple to operate and does not need wiring or other manual operations.
Description
Technical Field
The invention belongs to the technical field of frequency conversion electromechanical equipment, and particularly relates to a phase sequence switching device and method.
Background
With the development of the electrical industry, more and more devices are being driven using three-phase power, which, because of the importance and specificity of these devices, are often equipped with dual-loop or multi-loop power sources. However, because the phase sequences of the power supply input are different, the reasons such as the reverse phase sequence and the like caused by the fact that the output phase sequence of the power supply box cannot be identified by naked eyes in the working process, the power supply input phase sequence is disordered, and therefore three-phase equipment cannot normally operate and even equipment is reversed, and serious accidents are caused.
The traditional phase sequence detection technology uses a phase sequence detector to judge the sequence, and the mode is simpler, but when the phase sequence error occurs, an engineer is required to rewire, and the rewiring process is unavoidable to avoid the occurrence of errors again, so that the reworking is caused by the occurrence of errors of the phase sequence again, the time consumption is relatively large, and the workload is greatly increased. In addition, the above-mentioned prior art can only detect the phase sequence, and can not ensure the safer and more reliable operation of the device, and can not sense the change of the internal electrical signal, which is a problem to be solved.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a device and a method for switching the phase sequence of three-phase voltage, wherein the device can detect the phase sequence of equipment driven by a three-phase power supply, if the reverse sequence and the open term occur, the abnormal phase sequence can be switched to the positive sequence, and meanwhile, an indicator lamp is arranged to remind that the input phase sequence is abnormal.
To achieve the above object, according to a first aspect of the present invention, there is provided a phase sequence switching device comprising: the device comprises a working power supply module, a phase sequence monitoring unit and a phase sequence control unit;
the working power supply module comprises an anode port and a cathode port, and working voltages are respectively provided for the phase sequence monitoring unit and the phase sequence control unit;
the phase sequence monitoring unit comprises a voltage acquisition module and a detection switching module; the input end of the voltage acquisition module is connected with three-phase voltages; the detection switching module comprises a first pin, a second pin, a third pin and a switching connection device, the input end of the voltage acquisition module is connected with three-phase voltage, the output end of the voltage acquisition module is connected with the switching connection device, the input end of the first pin is connected with the positive electrode port, and the output end of the second pin is connected with the phase sequence control unit;
when the three-phase voltage phase sequence input by the voltage acquisition module is abnormal, triggering the switching connection part to connect the first pin with the second pin so that the second pin has working current output; when the phase sequence of the three-phase voltage input by the voltage acquisition module is normal, triggering the switching connection part to connect the first pin with the third pin;
the input end of the phase sequence control unit is connected with the second pin, the output end of the phase sequence control unit is connected with the negative electrode port, and the phase sequence control unit comprises a phase sequence switching module which is connected with the three-phase voltage;
when the second pin outputs current, the phase sequence switching module is triggered to perform phase sequence switching on the three-phase voltage.
Further, the phase sequence control unit comprises a first relay module and a second relay module; the first relay module comprises a first switch part and a first control part; the first switch part is arranged in the phase sequence switching module, one end of the first control part is connected with the second relay module, and the other end of the first control part is connected with the negative electrode port; the second relay module is respectively connected with the second pin and the positive electrode port;
when the second pin outputs current, triggering the second relay module to be closed; when the contacts of the second relay module are closed, the first control part drives the first switch part to be closed, so that the phase sequence switching module performs phase sequence switching on the three-phase voltage.
Further, the second relay module includes a second switch portion and a second control portion; one end of the second switch part is connected with the first control part, and the other end of the second switch part is connected with the positive electrode port; one end of the second control part is connected with the second pin, and the other end of the second control part is connected with the negative electrode port;
when the second pin outputs current, the second control part drives the second switch part to be closed so as to enable the second relay module contact to be closed.
Further, the phase sequence control unit further comprises a manual/automatic switching module, wherein the manual/automatic switching module comprises a third switch part, a first contact and a second contact, the third switch part is connected with the first control part, the first contact is connected with the second relay module, and the second contact is connected with the positive electrode port;
when the third switch part is closed with the first contact, the phase sequence switching module performs phase sequence switching on the three-phase voltage according to whether the second pin has current output or not; when the third switch part is closed with the second contact, the phase sequence switching module directly performs phase sequence switching on the three-phase voltage.
Further, the apparatus further comprises: the phase sequence indicating unit is connected with the second pin;
when the second pin outputs current, the phase sequence indicating unit is triggered to display a phase sequence abnormal alarm.
Further, the phase sequence indicating unit comprises an indicating lamp, one end of the indicating lamp is connected with the second pin, and the other end of the indicating lamp is connected with the negative electrode port;
when the second pin outputs current, the phase sequence indicating unit is triggered to display the abnormal alarm of the three-phase voltage phase sequence.
Further, the indicator light is a silicon rectifier diode.
According to a second aspect of the present invention, there is provided a phase sequence switching method applied to a phase sequence switching apparatus, the apparatus comprising: the device comprises a working power supply module, a phase sequence monitoring unit and a phase sequence control unit; the working power supply module comprises an anode port and a cathode port, and the phase sequence monitoring unit comprises a voltage acquisition module and a detection switching module; the input end of the voltage acquisition module is connected with three-phase voltages; the detection switching module comprises a first pin, a second pin, a third pin and a switching connection device, the input end of the voltage acquisition module is connected with three-phase voltage, the output end of the voltage acquisition module is connected with the switching connection device, the input end of the first pin is connected with the positive electrode port, and the output end of the second pin is connected with the phase sequence control unit; the phase sequence control unit is connected with the second pin and comprises a phase sequence switching module which is connected with the three-phase voltage; the method comprises the following steps:
the voltage acquisition module acquires three-phase voltage phase sequence information and sends the three-phase voltage phase sequence information to the switching connection part of the detection switching module;
when the switching connection part detects that the three-phase voltage phase sequence information is abnormal, the first pin is connected with a second pin, and the second pin outputs working current;
and the phase sequence switching module detects that the second pin has current output and performs phase sequence switching on the three-phase voltage.
Further, the method further comprises:
when the switching connection part detects that the three-phase voltage phase sequence information is normal, the first pin and the third pin are connected,
and the phase sequence switching module detects that the second pin does not have current output and performs phase sequence switching on the three-phase voltage.
Further, the apparatus further comprises: the phase sequence indicating unit is connected with the second pin; the method further comprises the steps of:
and the phase sequence indicating unit detects that the second pin has current output, and displays a phase sequence abnormal alarm.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
the phase sequence switching device and the phase sequence switching method provided by the invention can effectively monitor the phase sequence by the phase sequence monitoring unit and the phase sequence control unit which are arranged at the input end of the three-phase power supply, and the two relay modules are skillfully arranged in the phase sequence control unit, so that when the two relay modules are used in linkage, positive sequence current is directly output when positive sequence is detected, and when negative sequence is detected, positive sequence current can be output after the current is subjected to phase change by the phase sequence control unit, and the operation is simple, and wiring or other manual operations are not needed.
The phase sequence switching device and the phase sequence switching method provided by the invention not only can automatically monitor and switch the phase sequence, but also can directly switch the phase sequence of the three-phase power supply through the manual/automatic switching module when the phase sequence is positive. The device further comprises a phase sequence indicating unit, from which it can be seen whether a positive or a negative sequence current is currently input. Thereby being more intelligent and effectively saving time and cost.
Drawings
Fig. 1 is a schematic structural diagram of a phase sequence switching device according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of another phase sequence switching device according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of another phase sequence switching device according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of another phase sequence switching device according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of another phase sequence switching device according to embodiment 5 of the present invention;
in the figure:
a phase sequence monitoring unit-1; a phase sequence control unit-2; a phase sequence indicating unit-3; a working power supply module-4; a voltage acquisition module-11; detecting a switching module-12; a first pin-121; a second pin-122; third pin-123; switching the connection means-124; a phase sequence switching module-21; a first relay module-22; a second relay module-23; manual/automatic switching module-24; a first switching section-221; a first control unit (222); a second switching section-231; a second control section-232; a third switch section-241; a first contact-242; a second contact-243; an indicator lamp-31; positive electrode port-41; negative electrode port-42.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
It should be noted that the term "first/second" related to the present invention is merely to distinguish similar objects, and does not represent a specific order for the objects, and it should be understood that "first/second" may interchange a specific order or precedence where allowed. It is to be understood that the "first\second" distinguishing aspects may be interchanged where appropriate to enable embodiments of the invention described herein to be implemented in sequences other than those described or illustrated herein.
According to a specific embodiment of the present invention, as shown in fig. 1, there is provided a phase sequence switching device, including: the working power supply module 4, the phase sequence monitoring unit 1 and the phase sequence control unit 2; the working power supply module 4 is used for providing working voltages for the phase sequence monitoring unit 1 and the phase sequence control unit 2, the phase sequence monitoring unit 1 is used for monitoring whether the phase sequence of the three-phase voltage is abnormal, and the phase sequence control unit 2 is used for controlling the switching of the phase sequence of the three-phase voltage.
Specifically, the working power supply module 4 includes a positive electrode port 41 and a negative electrode port 42, which respectively provide working voltages for the phase sequence monitoring unit 1 and the phase sequence control unit 2; wherein, a positive electrode port 41 is connected with the phase sequence monitoring unit 1 and is used for inputting working voltage, and the working voltage flows into the phase sequence control unit 2 through the phase sequence monitoring unit 1; there is one positive port 41 and two negative ports 42 connected to the phase sequence control unit 2. Preferably, the operating voltage is 25V to 30V, more preferably, the operating voltage is 28V.
Specifically, the phase sequence monitoring unit 1 includes a voltage acquisition module 11 and a detection switching module 12; the input end of the voltage acquisition module 11 is connected with three-phase voltages; the detection switching module 12 comprises a first pin 121, a second pin 122, a third pin 123 and a switching connection device 124, wherein the input end of the voltage acquisition module 11 is connected with three-phase voltage, the output end of the voltage acquisition module is connected with the switching connection device 124, the input end of the first pin 121 is connected with the positive electrode port 41, and the output end of the second pin 122 is connected with the phase sequence control unit 2;
more specifically, when the three-phase voltage phase sequence input by the voltage acquisition module 11 is abnormal, the switching connection part 124 is triggered to connect the first pin 121 and the second pin 122, so that the second pin 122 has an operating current output; when the phase sequence of the three-phase voltage input by the voltage acquisition module 11 is normal, the switching connection part 124 is triggered to connect the first pin 121 and the third pin 15.
More specifically, the three-phase alternating current is connected to the phase sequence monitoring unit 1, and the voltage acquisition module 11 acquires phase sequence information of the three-phase alternating current and sends the phase sequence information to the switching connection device 124. The first pin 121 is connected to the positive electrode port 41 of the working power module 4, the first pin 121 is connected to a working voltage, and when the three-phase voltage phase sequence input by the voltage acquisition module 11 is abnormal, the switching connection part 124 connects the first pin 121 with the second pin 122, so that the working current of the first pin 121 flows into the second pin 122, and the second pin 122 outputs the working current; when the three-phase voltage phase sequence input by the voltage acquisition module 11 is normal, the switching connection part 124 is triggered to connect the first pin 121 and the third pin 15, so that the working current of the first pin 121 flows into the third pin 15, and the third pin 15 outputs the working current.
Specifically, the input end of the phase sequence control unit (2) is connected with the second pin 122, the output end is connected with the negative electrode port 42, the phase sequence control unit 2 comprises a phase sequence switching module 21, and the phase sequence switching module 21 is connected with the three-phase voltage;
more specifically, when the second pin 122 has a current output, the phase sequence switching module 21 is triggered to perform phase sequence switching on the three-phase voltage.
According to a specific embodiment of the present invention, as shown in fig. 2, there is provided a phase sequence switching device, the phase sequence control unit 2 including a first relay module 22 and a second relay module 23; the first relay module 22 includes a first switching section 221 and a first control section 222; the first switch 221 is disposed in the phase sequence switching module 21, and the first control unit 222 has one end connected to the second relay module 23 and the other end connected to the negative electrode port 42; the second relay module 23 is connected with the second pin 122 and the positive electrode port 41 respectively;
more specifically, when the second pin 122 has a current output, the second relay module 23 is triggered to be closed; when the contacts of the second relay module 23 are closed, the first control part 222 drives the first switch part 221 to be closed, so that the phase sequence switching module 21 performs phase sequence switching on the three-phase voltage.
More specifically, when the three-phase voltage phase sequence input by the voltage acquisition module 11 is abnormal, the switching connection part 124 connects the first pin 121 with the second pin 122, so that the working current of the first pin 121 flows into the second pin 122, and the second pin 122 has a working current output, thereby triggering the contact closure of the second relay module 23; at this time, the positive electrode port 41 at one end of the second relay module 23 is connected, the other end is connected to the first control portion 222, the other end of the first control portion 222 is connected to the negative electrode port 42, and the first control portion 222 has an operating voltage due to the closing of the second relay module 23, so that the first switch portion 221 can be driven to be closed; the first switch 221 is disposed in the phase sequence switching module 21, the phase sequence switching module 21 is connected to the three-phase voltage, and after the first switch 221 is closed, the phase sequence switching module 21 switches the phase sequence, so that the flowing three-phase voltage is output after the phase sequence switching.
According to a specific embodiment of the present invention, as shown in fig. 3, there is provided a phase sequence switching device, the second relay module 23 including a second switching section 231 and a second control section 232; one end of the second switch 231 is connected to the first control unit 222, and the other end is connected to the positive electrode port 41; one end of the second control part 232 is connected to the second pin 122, and the other end is connected to the negative electrode port 42;
more specifically, when the second pin 122 has a current output, the second control part 232 drives the second switching part 231 to be closed, so that the second relay module 23 contacts are closed.
More specifically, when the three-phase voltage phase sequence input by the voltage acquisition module 11 is abnormal, the switching connection part 124 connects the first pin 121 and the second pin 122, so that the working current of the first pin 121 flows into the second pin 122, and the second pin 122 has a working current output; one end of the second control part 232 is connected with the second pin 122, the other end is connected with the negative electrode port 42, and when the second pin 122 outputs working current, the second control part 232 is connected with working voltage, so that the second switch part 231 can be driven to be closed; at this time, the second switch part 231 has one end connected to the positive electrode port 41 and the other end connected to the first control part 222, the other end of the first control part 222 connected to the negative electrode port 42, and the second switch part 231 is closed to make the first control part 222 have an operating voltage, so that the first switch part 221 can be driven to be closed; the first switch 221 is disposed in the phase sequence switching module 21, the phase sequence switching module 21 is connected to the three-phase voltage, and after the first switch 221 is closed, the phase sequence switching module 21 switches the phase sequence, so that the flowing three-phase voltage is output after the phase sequence switching.
According to a specific embodiment of the present invention, as shown in fig. 4, there is provided a phase sequence switching device, the phase sequence control unit 2 further includes a manual/automatic switching module 24, the manual/automatic switching module 24 includes a third switch portion 241, a first contact 242 and a second contact 243, the third switch portion 241 is connected to the first control portion 222, the first contact 242 is connected to the second relay module 23, and the second contact 243 is connected to the positive electrode port 41;
more specifically, when the third switching section 241 is closed with the first contact 242, the phase sequence switching module 21 performs phase sequence switching on the three-phase voltage according to whether or not the second pin 122 has a current output; when the third switch portion 241 is closed with the second contact 243, the phase sequence switching module 21 directly performs phase sequence switching on the three-phase voltage.
More specifically, the third switch portion 241 is connected to the first control portion 222, the first contact 242 is connected to the second relay module 23, and the second contact 243 is connected to the positive electrode port 41; when the third switch 241 is closed to the first contact 242 by manual operation, the phase sequence control unit 2 can operate according to the aforementioned operation mode, which corresponds to the absence of the manual/automatic switching module 24; when the third switch 241 and the second contact 243 are closed by manual operation, the first control unit 222 is directly connected to the positive electrode port 41, corresponding to the absence of the second relay module 23, so that the first control unit 222 is connected to the operating voltage, directly drives the first switch 221 to be closed, and after the first switch 221 is closed, the phase sequence switching module 21 is switched in phase sequence, so that the three-phase voltage flowing in is output after the phase sequence switching.
According to a specific embodiment of the present invention, as shown in fig. 5, there is provided a phase sequence switching device, the device further comprising: a phase sequence indicating unit 3, the phase sequence indicating unit 3 being connected to the second pin 122;
more specifically, when the second pin 122 has a current output, the phase sequence indicating unit 3 is triggered to display a phase sequence abnormality alarm.
Specifically, the phase sequence indicating unit 3 includes an indicator light 31, one end of the indicator light 31 is connected to the second pin 122, and the other end is connected to the negative electrode port 42;
more specifically, when the second pin 122 has a current output, the phase sequence indicating unit 3 is triggered to display the three-phase voltage phase sequence abnormality alarm. Preferably, the indicator lamp 31 is a silicon rectifier diode.
According to another embodiment of the present invention, there is provided a phase sequence switching method applied to a phase sequence switching apparatus as described above, the apparatus including: the working power supply module 4, the phase sequence monitoring unit 1 and the phase sequence control unit 2; the working power supply module 4 comprises a positive electrode port 41 and a negative electrode port 42, and the phase sequence monitoring unit 1 comprises a voltage acquisition module 11 and a detection switching module 12; the input end of the voltage acquisition module 11 is connected with three-phase voltages; the detection switching module 12 comprises a first pin 121, a second pin 122, a third pin 123 and a switching connection device 124, wherein the input end of the voltage acquisition module 11 is connected with three-phase voltage, the output end of the voltage acquisition module is connected with the switching connection device 124, the input end of the first pin 121 is connected with the positive electrode port 41, and the output end of the second pin 122 is connected with the phase sequence control unit 2; the phase sequence control unit 2 is connected with the second pin 122, the phase sequence control unit 2 comprises a phase sequence switching module 21, and the phase sequence switching module 21 is connected with the three-phase voltage; the method comprises the following steps:
the voltage acquisition module 11 acquires three-phase voltage phase sequence information and sends the three-phase voltage phase sequence information to the switching connection part 124 of the detection switching module 12;
when the switching connection part 124 detects that the three-phase voltage phase sequence information is abnormal, the first pin 121 is connected with the second pin 122, and the second pin 122 has working current output;
the phase sequence switching module 21 detects that the second pin 122 has a current output, and performs phase sequence switching on the three-phase voltage.
Specifically, the method further comprises:
when the switching connection part 124 detects that the three-phase voltage phase sequence information is normal, it connects the first pin 121 and the third pin 123,
the phase sequence switching module 21 detects that the second pin 122 has no current output, and performs phase sequence switching on the three-phase voltage.
Specifically, the device further comprises: a phase sequence indicating unit 3, the phase sequence indicating unit 3 being connected to the second pin 122; the method further comprises the steps of:
the phase sequence indicating unit 3 detects that the second pin 122 has current output, and displays a phase sequence abnormal alarm.
More specifically, the method is based on the phase sequence switching device described above, so specific operation principles and technical implementation means are the same as those of the phase sequence switching device, and therefore will not be described in detail.
According to another specific embodiment of the invention, an electronic device is provided comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method as described above when executing the computer program.
According to another specific embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method as described above.
It should be understood that any process or method description in the methods, flowcharts, or otherwise described herein may be understood to represent modules, segments, or portions of code including one or more executable instructions for implementing specific logical functions or steps of the process, and that the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending upon the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A phase sequence switching device, the device comprising: the device comprises a working power supply module (4), a phase sequence monitoring unit (1) and a phase sequence control unit (2);
the working power supply module (4) comprises an anode port (41) and a cathode port (42) which respectively provide working voltages for the phase sequence monitoring unit (1) and the phase sequence control unit (2);
the phase sequence monitoring unit (1) comprises a voltage acquisition module (11) and a detection switching module (12); the input end of the voltage acquisition module (11) is connected with three-phase voltage; the detection switching module (12) comprises a first pin (121), a second pin (122), a third pin (123) and a switching connection device (124), wherein the input end of the voltage acquisition module (11) is connected with three-phase voltage, the output end of the voltage acquisition module is connected with the switching connection device (124), the input end of the first pin (121) is connected with the positive electrode port (41), and the output end of the second pin (122) is connected with the phase sequence control unit (2);
when the three-phase voltage phase sequence input by the voltage acquisition module (11) is abnormal, the switching connection device (124) is triggered to connect the first pin (121) and the second pin (122) so that the second pin (122) has working current output; when the phase sequence of the three-phase voltage input by the voltage acquisition module (11) is normal, triggering the switching connection device (124) to connect the first pin (121) with the third pin (123);
the input end of the phase sequence control unit (2) is connected with the second pin (122), the output end of the phase sequence control unit is connected with the negative electrode port (42), the phase sequence control unit (2) comprises a phase sequence switching module (21), and the phase sequence switching module (21) is connected with the three-phase voltage;
when the second pin (122) outputs current, triggering the phase sequence switching module (21) to perform phase sequence switching on the three-phase voltage; the phase sequence control unit (2) comprises a first relay module (22) and a second relay module (23); the first relay module (22) includes a first switch unit (221) and a first control unit (222); the first switch part (221) is arranged in the phase sequence switching module (21), one end of the first control part (222) is connected with the second relay module (23), and the other end is connected with the negative electrode port (42); the second relay module (23) is respectively connected with the second pin (122) and the positive electrode port (41);
when the second pin (122) has current output, triggering the contact of the second relay module (23) to be closed; when the contacts of the second relay module (23) are closed, the first control part (222) drives the first switch part (221) to be closed so that the phase sequence switching module (21) performs phase sequence switching on the three-phase voltage.
2. The phase sequence switching device according to claim 1, wherein the second relay module (23) comprises a second switching section (231) and a second control section (232); one end of the second switch part (231) is connected with the first control part (222), and the other end is connected with the positive electrode port (41); one end of the second control part (232) is connected with the second pin (122), and the other end is connected with the negative electrode port (42);
when the second pin (122) outputs current, the second control part (232) drives the second switch part (231) to be closed so as to enable the contacts of the second relay module (23) to be closed.
3. Phase sequence switching device according to claim 1, characterized in that the phase sequence control unit (2) further comprises: a manual/automatic switching module (24), the manual/automatic switching module (24) including a third switch portion (241), a first contact (242) and a second contact (243), the third switch portion (241) being connected to the first control portion (222), the first contact (242) being connected to the second relay module (23), the second contact (243) being connected to the positive electrode port (41);
wherein, when the third switch part (241) is closed with the first contact (242), the phase sequence switching module (21) performs phase sequence switching on the three-phase voltage according to whether the second pin (122) has current output or not; when the third switch part (241) is closed with the second contact (243), the phase sequence switching module (21) directly performs phase sequence switching on the three-phase voltage.
4. The phase sequence switching device according to claim 1, wherein the device further comprises: a phase sequence indicating unit (3), the phase sequence indicating unit (3) being connected to the second pin (122);
when the second pin (122) has current output, the phase sequence indication unit (3) is triggered to display a phase sequence abnormal alarm.
5. The phase sequence switching device according to claim 4, wherein the phase sequence indicating unit (3) comprises an indicator light (31), one end of the indicator light (31) is connected to the second pin (122), and the other end is connected to the negative electrode port (42);
when the second pin (122) outputs current, the phase sequence indicating unit (3) is triggered to display the three-phase voltage phase sequence abnormal alarm.
6. Phase sequence switching device according to claim 5, characterized in that the indicator light (31) is a silicon rectifier diode.
7. A phase sequence switching method, characterized in that it is applied to any one of the phase sequence switching devices of claims 1-6, said method comprising:
the voltage acquisition module (11) acquires three-phase voltage phase sequence information and sends the three-phase voltage phase sequence information to the switching connection device (124) of the detection switching module (12);
when the switching connection device (124) detects that the three-phase voltage phase sequence information is abnormal, the first pin (121) is connected with a second pin (122), and the second pin (122) has working current output;
the phase sequence switching module (21) detects that the second pin (122) has current output and performs phase sequence switching on the three-phase voltage.
8. The phase sequence switching method according to claim 7, further comprising:
when the switching connection device (124) detects that the three-phase voltage phase sequence information is normal, the first pin (121) and the third pin (123) are connected,
the phase sequence switching module (21) detects that the second pin (122) has no current output, and performs phase sequence switching on the three-phase voltage.
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