CN113589057A - Phase sequence switching device and method - Google Patents
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Abstract
The invention provides a phase sequence switching device and a 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 the three-phase voltage; the detection switching module comprises a first pin, a second pin, a third pin and a switching connecting 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 connecting 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 because of comprising 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 to be wired or manually operated.
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 driven by three-phase power, and due to the importance and particularity of these devices, they are often equipped with a double-circuit or multi-circuit power supply. However, the phase sequence of each path of power input is different, and the reason that the output phase sequence of the power box cannot be recognized by naked eyes in work, so that the reverse phase sequence and the like are caused, the phase sequence of the power input is disordered, and thus, three-phase equipment cannot normally operate, and even the equipment is reversely rotated, so that major accidents are caused.
The traditional phase sequence detection technology is to use a phase sequence detector to judge sequences, although the mode is simpler, when a phase sequence error occurs, an engineer is required to re-wire, in the re-wiring process, the error cannot be avoided to occur again, so that the phase sequence error is caused again to cause rework, the time consumption is larger, and the workload is greatly increased. In addition, the above prior art can only perform phase sequence detection, and cannot ensure the device to operate more safely and reliably, and cannot sense the change of the internal electrical signal, which is a problem to be solved urgently.
Disclosure of Invention
The device can detect the phase sequence of equipment driven by a three-phase power supply, if a reverse sequence and an item lack occur, the abnormal phase sequence can be switched to a positive sequence, and meanwhile, an indicator light 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 apparatus, comprising: the phase sequence monitoring 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 anode port and the cathode port respectively provide working voltage 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 voltage; the detection switching module comprises a first pin, a second pin, a third pin and a switching connecting 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 connecting device, the input end of the first pin is connected with the anode port, and the output end of the second pin is connected with the phase sequence control unit;
when the phase sequence of the three-phase voltage input by the voltage acquisition module is abnormal, the switching connection part is triggered to connect the first pin and 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 and 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, the phase sequence control unit comprises a phase sequence switching module, and the phase sequence switching module is connected with the three-phase voltage;
when the second pin has current output, 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 switching 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 terminal port;
when the second pin has current output, triggering the contact of the second relay module to be closed; when the second relay module contact is 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 comprises a second switch part and a second control part; 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 anode 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 has current output, the second control part drives the second switch part to be closed so as to close the second relay module contact.
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 port;
when the third switch part and the first contact are closed, the phase sequence switching module switches the phase sequence of the three-phase voltage according to whether the second pin has current output or not; and when the third switch part and the second contact are closed, the phase sequence switching module directly switches the phase sequence of the three-phase voltage.
Further, the apparatus further comprises: a phase sequence indicating unit connected to the second pin;
when the second pin has current output, the phase sequence indicating unit is triggered to display a phase sequence abnormal alarm.
Furthermore, the phase sequence indicating unit comprises an indicator light, one end of the indicator light is connected with the second pin, and the other end of the indicator light is connected with the negative electrode port;
when the second pin has current output, the phase sequence indicating unit is triggered to display the three-phase voltage phase sequence abnormity alarm.
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 including: the phase sequence monitoring 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 voltage; the detection switching module comprises a first pin, a second pin, a third pin and a switching connecting 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 connecting device, the input end of the first pin is connected with the anode 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 and the second pin are connected, and the second pin has working current output;
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 no current is output from the second pin and performs phase sequence switching on the three-phase voltage.
Further, the apparatus further comprises: a phase sequence indicating unit connected to the second pin; the method further comprises the following steps:
and the phase sequence indicating unit detects that the second pin has current output, and displays a phase sequence abnormal alarm.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
the phase sequence switching device and the phase sequence switching method provided by the invention have the advantages that the phase sequence monitoring unit and the phase sequence control unit are arranged at the input end of the three-phase power supply, the phase sequence can be effectively monitored, the two relay modules are ingeniously arranged in the phase sequence control unit, when the two relay modules are used in a linkage mode, when the positive sequence is detected, the positive sequence current can be directly output, and when the negative sequence is detected, the positive sequence current can be output after the current is subjected to phase change by the phase sequence control unit, the operation is simple, and wiring or other manual operations are not needed.
The phase sequence switching device and the method provided by the invention comprise the manual/automatic switching module, so that not only can the phase sequence monitoring and switching be automatically carried out, but also the phase sequence of the three-phase power supply can be directly switched through the manual/automatic switching module when the phase sequence is determined to be negative. In addition, the device also comprises a phase sequence indicating unit, and whether the current input is positive sequence current or negative sequence current can be seen from the input phase sequence indicating unit. Thereby being more intelligent and effectively saving time and cost.
Drawings
Fig. 1 is a schematic structural diagram of a phase-sequence switching apparatus implemented according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of another phase-sequence switching apparatus implemented according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of another phase-sequence switching apparatus implemented according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of another phase-sequence switching apparatus implemented according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of another phase-sequence switching apparatus implemented according to embodiment 5 of the present invention;
in the figure:
a phase sequence monitoring unit-1; a phase sequence control unit-2; phase sequence indication unit-3; a working power supply module-4; a voltage acquisition module-11; a detection switching module-12; a first pin-121; a second pin-122; a third pin-123; switching 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 unit-232; a third switching part-241; a first contact-242; a second contact-243; an indicator light-31; positive port-41; negative port-42.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
It should be noted that the term "first \ second" referred to in the present invention is only used for distinguishing similar objects, and does not represent a specific ordering for the objects, and it should be understood that "first \ second" may be interchanged in a specific order or sequence, if allowed. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that embodiments of the invention described herein may be practiced 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 apparatus, including: the phase sequence monitoring 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 is used for providing working voltage 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; one positive electrode port 41 is connected with the phase sequence monitoring unit 1 and 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 voltage; the detection switching module 12 includes a first pin 121, a second pin 122, a third pin 123 and a switching connection device 124, the input end of the voltage acquisition module 11 is connected to a three-phase voltage, the output end thereof is connected to the switching connection device 124, the input end of the first pin 121 is connected to the positive terminal 41, and the output end of the second pin 122 is connected to the phase sequence control unit 2;
more specifically, when the voltage acquisition module 11 inputs a three-phase voltage with an abnormal phase sequence, the switching connection portion 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 three-phase voltage input by the voltage acquisition module 11 is normal in phase sequence, the switching connection portion 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 terminal 41 of the working power supply module 4, the first pin 121 is connected to a working voltage, and when the voltage acquisition module 11 inputs a three-phase voltage with an abnormal phase sequence, the switching connection portion 124 connects the first pin 121 to the second pin 122, so that a working current of the first pin 121 flows into the second pin 122, and the second pin 122 outputs a working current; when the three-phase voltage input by the voltage acquisition module 11 is normal in phase sequence, the switching connection portion 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 to the second pin 122, the output end of the phase sequence control unit is connected to the negative electrode port 42, the phase sequence control unit 2 includes a phase sequence switching module 21, and the phase sequence switching module 21 is connected to 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 apparatus, wherein the phase sequence control unit 2 further includes a first relay module 22 and a second relay module 23; the first relay module 22 includes a first switching unit 221 and a first control unit 222; the first switch 221 is disposed in the phase-sequence switching module 21, one end of the first control unit 222 is connected to the second relay module 23, and the other end is connected to the negative port 42; the second relay module 23 is connected to the second pin 122 and the positive terminal 41 respectively;
more specifically, when the second pin 122 has a current output, the second relay module 23 is triggered to close the contact; when the second relay module 23 contacts are closed, the first control unit 222 drives the first switch unit 221 to close, so that the phase sequence switching module 21 switches the phase sequence of the three-phase voltage.
More specifically, when the voltage acquisition module 11 inputs a three-phase voltage with an abnormal phase sequence, the switching connection portion 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, thereby triggering the contact closing of the second relay module 23; at this time, the positive port 41 of one end of the second relay module 23 is connected, the other end of the second relay module is connected with the first control part 222, the other end of the first control part 222 is connected with the negative port 42, and the first control part 222 has a working voltage due to the closing of the second relay module 23, so that the first switch part 221 can be driven to be closed; the first switch unit 221 is disposed in the phase sequence switching module 21, the phase sequence switching module 21 is connected to the three-phase voltage, and the first switch unit 221 is closed to switch the phase sequence of the phase sequence switching module 21, so that the three-phase voltage flowing in is output after being switched to the phase sequence.
According to a specific embodiment of the present invention, as shown in fig. 3, a phase sequence switching device is provided, where the second relay module 23 includes a second switching part 231 and a second control part 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 unit 232 drives the second switch unit 231 to close, so that the contact of the second relay module 23 is closed.
More specifically, when the voltage acquisition module 11 inputs a three-phase voltage with an abnormal phase sequence, the switching connection portion 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, 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, one end of the second switch 231 is connected to the positive port 41, the other end is connected to the first control unit 222, the other end of the first control unit 222 is connected to the negative port 42, and the first control unit 222 has a working voltage due to the closing of the second switch 231, so that the first switch 221 can be driven to close; the first switch unit 221 is disposed in the phase sequence switching module 21, the phase sequence switching module 21 is connected to the three-phase voltage, and the first switch unit 221 is closed to switch the phase sequence of the phase sequence switching module 21, so that the three-phase voltage flowing in is output after being switched to the phase sequence.
According to a specific embodiment of the present invention, as shown in fig. 4, there is provided a phase sequence switching apparatus, the phase sequence control unit 2 further includes a manual/automatic switching module 24, the manual/automatic switching module 24 includes a third switching portion 241, a first contact 242 and a second contact 243, the third switching 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 part 241 and the first contact 242 are closed, the phase-sequence switching module 21 performs phase-sequence switching on the three-phase voltage according to whether there is a current output from the second pin 122; when the third switch portion 241 and the second contact 243 are closed, the phase-sequence switching module 21 directly performs phase-sequence switching on the three-phase voltages.
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 portion 241 and the first contact 242 are closed by manual operation, which is equivalent to that the manual/automatic switching module 24 is not provided, the phase sequence control unit 2 can operate according to the aforementioned operation mode; when the third switch portion 241 and the second contact 243 are closed by a manual operation, the first control portion 222 is directly connected to the positive electrode port 41, that is, the second relay module 23 is not provided, so that the first control portion 222 receives the operating voltage and directly drives the first switch portion 221 to close, and the phase sequence switching module 21 performs phase sequence switching after the first switch portion 221 is closed, so that the inflowing three-phase voltage 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 apparatus, the apparatus further comprising: a phase sequence indication unit 3, wherein the phase sequence indication unit 3 is connected with the second pin 122;
more specifically, when the second pin 122 has a current output, the phase sequence indication unit 3 is triggered to display a phase sequence abnormality alarm.
Specifically, the phase sequence indicating unit 3 includes an indicator lamp 31, one end of the indicator lamp 31 is connected to the second pin 122, and the other end is connected to the negative terminal 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 light 31 is a silicon rectifier diode.
According to another embodiment of the present invention, there is provided a phase sequence switching method applied to the phase sequence switching apparatus described above, the apparatus including: the phase sequence monitoring 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 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 voltage; the detection switching module 12 includes a first pin 121, a second pin 122, a third pin 123 and a switching connection device 124, the input end of the voltage acquisition module 11 is connected to a three-phase voltage, the output end thereof is connected to the switching connection device 124, the input end of the first pin 121 is connected to the positive terminal 41, and the output end of the second pin 122 is connected to the phase sequence control unit 2; the phase sequence control unit 2 is connected to the second pin 122, the phase sequence control unit 2 includes a phase sequence switching module 21, and the phase sequence switching module 21 is connected to 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 and the second pin 122 are connected, 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.
Specifically, the method further comprises:
when the switching connection unit 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 no current is output from the second pin 122, and performs phase sequence switching on the three-phase voltage.
Specifically, the apparatus further comprises: a phase sequence indication unit 3, wherein the phase sequence indication unit 3 is connected with the second pin 122; the method further comprises the following steps:
the phase sequence indicating unit 3 detects that the second pin 122 has current output, and displays a phase sequence abnormality alarm.
More specifically, the method is based on the phase sequence switching device, so the specific working principle and technical implementation means are the same as those of the phase sequence switching device, and are not described in detail.
According to another specific embodiment of the present invention, an electronic device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements 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, 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 descriptions of methods, flow diagrams, or otherwise described herein, may be understood as representing modules, segments, or portions of code which include 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, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A phase sequence switching apparatus, comprising: the phase sequence monitoring 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 a positive electrode port (41) and a negative electrode port (42) which respectively provide working voltage 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 connecting device (124), the input end of the voltage acquisition module (11) is connected with a three-phase voltage, the output end of the voltage acquisition module is connected with the switching connecting device (124), the input end of the first pin (121) is connected with the anode port (41), and the output end of the second pin (122) is connected with the phase sequence control unit (2);
when the voltage acquisition module (11) inputs three-phase voltage with abnormal phase sequence, 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 working 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 (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) has current output, the phase sequence switching module (21) is triggered to perform phase sequence switching on the three-phase voltage.
2. The phase sequence switching apparatus according to claim 1, wherein the phase sequence control unit (2) comprises further a first relay module (22) and a second relay module (23); the first relay module (22) comprises a first switch part (221) and a first control part (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 of the first control part 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, the contact of the second relay module (23) is triggered to be closed; when the contact of the second relay module (23) is 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.
3. The phase-sequence switching apparatus according to claim 2, wherein the second relay module (23) includes 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) has current output, the second control part (232) drives the second switch part (231) to be closed so as to close the contact of the second relay module (23).
4. The phase-sequence switching apparatus according to claim 2, wherein the phase-sequence control unit (2) further comprises the manual/automatic switching module (24) including a third switching section (241), a first contact (242), and a second contact (243), the third switching section (241) being connected to the first control section (222), the first contact (242) being connected to the second relay module (23), and the second contact (243) being connected to the positive port (41);
when the third switch part (241) and the first contact (242) are closed, the phase sequence switching module (21) switches the phase sequence of the three-phase voltage according to whether the second pin (122) has current output; when the third switch portion (241) and the second contact (243) are closed, the phase sequence switching module (21) directly performs phase sequence switching on the three-phase voltage.
5. The phase sequence switching apparatus according to claim 1, further comprising: a phase sequence indication unit (3), the phase sequence indication unit (3) being connected with the second pin (122);
when the second pin (122) has current output, the phase sequence indicating unit (3) is triggered to display a phase sequence abnormal alarm.
6. The phase sequence switching device according to claim 5, wherein the phase sequence indicating unit (3) comprises an indicator light (31), the one end of which is connected to the second pin (122) and the other end of which is connected to the negative terminal (42);
when the second pin (122) has current output, the phase sequence indicating unit (3) is triggered to display the three-phase voltage phase sequence abnormal alarm.
7. The phase sequence switching device according to claim 6, wherein the indicator light (31) is a silicon rectifier diode.
8. A phase sequence switching method, applied to a phase sequence switching apparatus, the apparatus comprising: the phase sequence monitoring 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 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 voltage; the detection switching module (12) comprises a first pin (121), a second pin (122), a third pin (123) and a switching connecting device (124), the input end of the voltage acquisition module (11) is connected with a three-phase voltage, the output end of the voltage acquisition module is connected with the switching connecting device (124), the input end of the first pin (121) is connected with the anode 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) and the second pin (122) are connected, and the second pin (122) has working current output;
and 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.
9. The phase sequence switching method of claim 8, further comprising:
the switching connection part (124) is used for connecting the first pin (121) and the third pin (123) when detecting that the three-phase voltage phase sequence information is normal,
the phase sequence switching module (21) detects that no current is output from the second pin (122), and performs phase sequence switching on the three-phase voltage.
10. The phase sequence switching method according to claim 8, wherein the apparatus further comprises: a phase sequence indication unit (3), the phase sequence indication unit (3) being connected with the second pin (122); the method further comprises the following steps:
and the phase sequence indicating unit (3) detects that the second pin (122) has current output, and displays a phase sequence abnormal alarm.
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