Three-phase power supply phase sequence conversion device

Abstract

The invention discloses a phase sequence conversion device for a three-phase power supply. The phase sequence conversion device comprises a box body, an operation panel and a mounting plate, a power knob switch, an L1 phase sequence change-over switch, an L2 phase sequence change-over switch and an L3 phase sequence change-over switch are embedded on the operation panel; the mounting plate is fixed below an operation panel in the box body; a power supply control circuit, an L1 phase sequence control circuit, an L2 phase sequence control circuit and an L3 phase sequence control circuit are arranged on the mounting plate; the power supply control circuit is connected with the power supply knob switch, the power supply knob switch is used for controlling the on-off of the power supply control circuit and the A-phase, B-phase and C-phase power supplies, and the L1 phase sequence control circuit, the L2 phase sequence control circuit and the L3 phase sequence control circuit are respectively connected with the A-phase, B-phase and C-phase through the power supply control circuit. At the same time, the L1 phase sequence control circuit, the L2 phase sequence control circuit and the L3 phase sequence control circuit are respectively communicated with different phases in the A phase, the B phase and the C phase. The device is low in manufacturing cost, small and exquisite, convenient to install, capable of achieving rapid power supply phase sequence conversion on equipment such as medium and small power test stands and instruments with power supply phase sequence requirements, capable of meeting use requirements, free of phase sequence adjustment on an on-site power supply, convenient, rapid and good in safety.

Description

Technical Field

[0001] The present application relates to the field of circuit design and safety protection technology, and in particular to a three-phase power supply phase sequence conversion device. Background Art

[0002] In a test bench control circuit, due to the use requirements for the power phase sequence, the designer installed a power phase sequence detection device at the power input end. Only when the three-phase power phase sequence connected to the test bench is the same as the three-phase power phase sequence required by the design, the indicator light on the test bench will light up and the test bench can perform test operations. However, the test bench needs to be used in multiple production sites, and the three-phase power phase sequence provided by each site is different, which makes the test bench extremely inconvenient to use in multiple sites. Before use, it is necessary to measure the phase sequence of the power supply of the L1, L2, and L3 phase lines of the power sockets on site, and then adjust the phase line wiring of the L1, L2, and L3 phase lines of the power input plug of the test bench according to the phase sequence requirements of the test bench. The test bench can be used. On-site measurement of phase sequence and on-site rewiring require electrical maintenance personnel to use special instruments to measure and implement. For safety reasons, ordinary users cannot and do not have the ability to perform this work. Because the test bench is frequently used in multiple sites, changing a site requires electrical maintenance personnel to perform on-site measurements and rewiring, which is a large logistical workload. Summary of the invention

[0003] The purpose of the present invention is to provide a three-phase power supply phase sequence conversion device to solve the problem of applicable conversion of the three-phase power supply phase sequence.

[0004] Technical solution of the present invention: In order to achieve the above-mentioned invention purpose, a three-phase power phase sequence conversion device is proposed, including a box, an operation panel, and a mounting plate; a power knob switch, an L1 phase sequence conversion switch, an L2 phase sequence conversion switch, and an L3 phase sequence conversion switch are embedded on the operation panel; the mounting plate is fixed under the operation panel inside the box, and a power control circuit, an L1 phase sequence control circuit, an L2 phase sequence control circuit, and an L3 phase sequence control circuit are arranged on the mounting plate; the power control circuit is connected to the power knob switch, and the power control circuit and the A phase, B phase, and C phase power supply are controlled by the power knob switch. The L1 phase sequence control circuit, the L2 phase sequence control circuit, and the L3 phase sequence control circuit are respectively connected to the A phase, B phase, and C phase power supply through the power control circuit, and the L1 phase sequence conversion switch, the L2 phase sequence conversion switch, and the L3 phase sequence conversion switch are used to realize that the L1 phase sequence control circuit, the L2 phase sequence control circuit, and the L3 phase sequence control circuit are respectively electrically connected to different phases of the A phase, the B phase, and the C phase at the same time.

[0005] Furthermore, the operation panel also includes a power indicator light; an L1 phase A on indicator light, an L1 phase B on indicator light, and an L1 phase C on indicator light; an L2 phase A on indicator light, an L2 phase B on indicator light, and an L2 phase C on indicator light; an L3 phase A on indicator light, an L3 phase B on indicator light, and an L3 phase C on indicator light; the power indicator light is connected to the power control circuit to indicate the on and off of the A phase, B phase, and C phase power supplies; the L1 phase A on indicator light, the L1 phase B on indicator light, and the L1 phase C on indicator light are connected to the L1 phase sequence control circuit to indicate the connected phase of the L1 phase sequence control circuit; the L2 phase A on indicator light, the L2 phase B on indicator light, and the L2 phase C on indicator light are connected to the L2 phase sequence control circuit to indicate the connected phase of the L2 phase sequence control circuit; the L3 phase A on indicator light, the L3 phase B on indicator light, and the L3 phase C on indicator light are connected to the L3 phase sequence control circuit to indicate the connected phase of the L3 phase sequence control circuit.

[0006] Furthermore, the power control circuit includes a three-phase leakage protection switch, a power switch relay, a power knob switch and a power indicator light. After the three-phase leakage protection circuit breaker, the three-phase power supply is connected to the power switch relay 2# normally open contact, the power switch relay 3# normally open contact and the power switch relay 4# normally open contact, and then connected to the L1 phase sequence conversion switch, the L2 phase sequence conversion switch and the L3 phase sequence conversion switch. The power indicator light is connected from the lower end of the power switch relay 2# normally open contact, and the power switch relay controls the circuit. The circuit is connected from the A1 node at the lower end of the three-phase leakage protection circuit breaker, connected to the power switch relay through the power switch knob, and then connected from the L node in sequence to the 1# and 2# terminals of the L1 phase sequence conversion switch, the 9# and 10# terminals of the L2 phase sequence conversion switch, and the 17# and 18# terminals of the L3 phase sequence conversion switch. The 1# normally open contact of the power switch relay is connected between the L node and the N1 node. After the three-phase leakage protection circuit breaker is closed, the A1 node is energized. Turn the power knob switch to the "on" position, and the power switch relay is energized. When the L After the 1 phase sequence conversion switch, L2 phase sequence conversion switch and L3 phase sequence conversion switch are all turned to the "power on" gear, 1# terminal to 2# terminal is connected, 9# terminal to 10# terminal is connected, 17# terminal to 18# terminal is connected, the power switch relay is turned on, the 1# normally open contact of the power switch relay is closed and turned on, and the L node and N1 node are kept normally connected and self-locking. When the L1 phase sequence conversion switch, L2 phase sequence conversion switch and L3 phase sequence conversion switch are turned off from the "power on" gear, 1# terminal to 2# terminal is disconnected, 9# terminal to 10# terminal is connected, 17# terminal to 18# terminal is connected, the power switch relay is turned on, and the 1# normally open contact of the power switch relay is closed and turned on, and the L node and N1 node are kept normally connected and self-locking is formed. # terminal to 10# terminal is disconnected, 17# terminal to 18# terminal is disconnected, the power switch relay circuit will also remain conductive, at the same time, the power switch relay 2# normally open contact, the power switch relay 3# normally open contact and the power switch relay 4# normally open contact are also closed and conductive, the A phase power supply, the B phase power supply and the C phase power supply are loaded to the L1 phase sequence conversion switch, the L2 phase sequence conversion switch, the L3 phase sequence conversion switch through the three normally open contacts, the power indicator light up, and the power will be turned off after the power knob switch is turned to the "off" position.

[0007] Furthermore, the L1 phase sequence conversion switch has four positions: "power on", "Phase A", "Phase B" and "Phase C". When the switch is turned to the "power on" position, the 1# terminal and the 2# terminal connected to the power switch part are connected. When the switch is turned to the "Phase A" position, the 3# terminal and the 4# terminal are connected, and the A phase electricity is loaded to the 4# terminal. When the switch is turned to the "Phase B" position, the 5# terminal and the 6# terminal are connected, and the B phase electricity is loaded to the 6# terminal. When the switch is turned to the "Phase C" position, the 7# terminal and the 8# terminal are connected, and the C phase electricity is loaded to the 8# terminal. The L2 phase sequence conversion switch and the L3 phase sequence conversion switch are the same as the L1 The phase sequence conversion switches have the same structure. Only when the three phase sequence conversion switches are all turned to the "power on" position can the power knob switch be turned to the "on" position, and the three-phase power can be loaded to the three phase sequence conversion switches. At this time, the three-phase power cannot be loaded to the A1 relay and other 9 relays through the three phase sequence conversion switches. If the "power on" position is not designed, assuming that the three phase sequence conversion switches are all in the "A phase" position when power is turned on, at the moment of power-on, the A1 relay, A4 relay and A7 relay will all be turned on at the same time, and the L1 phase line, L2 phase line and L3 phase line will all be A phase power, which may cause certain safety hazards.

[0008] Furthermore, A1 relay, A2 relay, A3 relay, A4 relay, A5 relay, A6 relay, A7 relay, A8 relay and A9 relay, A1 relay is connected from L1 phase sequence switch 4# terminal, the circuit is connected in series with A4 relay 3# normally closed contact and A7 relay 3# normally closed contact, A1 relay 1# normally open contact is connected to L1 phase A on indicator light circuit, A1 relay 2# normally open contact is connected to L1 phase line output circuit, A1 relay 3# normally closed contact is connected in series with A4 relay circuit , the 4# normally closed contact of A1 relay is connected in series with the A7 relay circuit, and the relay conduction follows the time priority principle. When the L1 phase sequence conversion switch is turned to the "A phase" gear, if the L2 phase sequence conversion switch and the L3 phase sequence conversion switch are not in the "A phase" gear at this time, the 3# normally closed contact of A4 relay and the 3# normally closed contact of A7 relay are closed, the A phase power supply will be loaded to the A1 relay and turned on, the 1# normally open contact of A1 relay and the 2# normally open contact of A1 relay will be closed, and the L1 phase A connection indicator light will light up, and A Phase power will be loaded to L1 phase line output, A1 relay 3# normally closed contact and A1 relay 4# normally closed contact will be disconnected. If L2 phase sequence conversion switch and L3 phase sequence conversion switch are turned to "A phase", A4 relay and A7 relay will not be turned on, and A phase power cannot be loaded to L2 phase line and L3 phase line. The principles and wiring of other 8 relays are the same as A1 relay. The relay conduction follows the time priority principle to make A1 relay to A9 relay 9 relays. Among A1 relay, A4 relay and A7 relay connected to A phase power supply, only one relay can be turned on at any time. Which relay is turned on first, the other two relays cannot be turned on. The same is true for A2 relay, A5 relay and A8 relay connected to B phase power supply, and A3 relay, A6 relay and A9 relay connected to C phase power supply. In this way, it can be ensured that only one relay will be turned on in any phase circuit at any time, and only one connection indicator light will be on for any phase, which can avoid the safety risks caused by the disorder of power supply phase sequence.

[0009] Furthermore, it includes 9 on indicator lights, the L1 phase A on indicator light, the L2 phase A on indicator light and the L3 phase A on indicator light are green, the L1 phase B on indicator light, the L2 phase B on indicator light and the L3 phase B on indicator light are yellow, the L1 phase C on indicator light, the L2 phase C on indicator light and the L3 phase C on indicator light are red. The design can ensure that at any time, at most one indicator light of the same color can be lit, which makes it convenient for users to observe the power output status and has a visual error prevention function.

[0010] The advantages of the present invention are as follows: the electrical components used in the device are all commonly used devices on the market, and the designed logic circuits are all hard-wired, without special manufacturing process requirements, and are easy to manufacture; a small intermediate relay is used to miniaturize the device, that is, it can be installed on a small and medium power test bench or precision instrument, and can also be made into a portable mobile device; the device can output 6 power phase sequence combinations to meet the power phase sequence requirements of various places; the device has a variety of safety protection measures and has high safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a device according to a preferred embodiment of the present invention;

[0012] Figure 2 The electrical schematic diagram of the circuit of the preferred embodiment of the present invention;

[0013] Figure 3 A schematic diagram of an operation panel of a preferred embodiment of the present invention;

[0014] Figure 4 A schematic diagram of a transfer switch according to a preferred embodiment of the present invention;

[0015] Figure 5 Schematic diagram of the L1 phase sequence control part of the preferred embodiment of the present invention;

[0016] Figure 6 Schematic diagram of the L2 phase sequence control part of the preferred embodiment of the present invention;

[0017] Figure 7 Schematic diagram of the L3 phase sequence control part of the preferred embodiment of the present invention;

[0018] Figure 8 Schematic diagram of the power switch control part of the preferred embodiment of the present invention;

[0019] Fig. 9 Schematic diagram of power supply phase sequence detection of existing test bench;

[0020] Description of the numbers in the figure:

[0021] PE grounding wire, N neutral wire, AA phase power supply, BB phase power supply, CC phase power supply, QF three-phase leakage protection switch, SA power knob switch, HL power indicator light, KA power switch relay, KA-1 power switch relay 1# normally open contact, KA-2 power switch relay 2# normally open contact, KA-3 power switch relay 3# normally open contact, KA-4 power switch relay 4# normally open contact, SA1 L1 phase sequence conversion switch, SA2 L2 phase sequence conversion switch, SA3 L3 phase sequence conversion switch, 1 1# terminal, 2 2# terminal, 3 3# terminal, 4 4# terminal, 5 5# terminal, 6 6# terminal, 7 7# terminal, 8 8# terminal, 9 9# terminal, 10 10# terminal, 11 11# terminal, 12 12# terminal, 13 13# terminal, 14 14# terminal, 15 15# terminal, 16 16# terminal, 17 17# terminal, 18 18# terminal, 19 19# terminal, 20 20# terminal, 21 21# terminal, 22 22# terminal, 23 23# terminal, 24 24# terminal, 25 "Power on", 26 "Phase A", 27 "Phase B", 30 "Phase C", 28 "Close", 29 "Open", A1 A1 relay, A1-1 A1 relay 1# normally open contact, A1-2 A1 relay 2# normally open contact, A1-3 A1 relay 3# normally closed contact, A1-4 A1 relay 4# normally closed contact, A2 A2 relay, A2-1 A2 relay 1# normally open contact, A2-2 A2 relay 2# normally open contact, A2-3A2 relay 3# normally closed contact, A2-4 A2 relay 4# normally closed contact, A3 A3 relay, A3-1 A3 relay 1# normally open contact, A3-2 A3 relay 2# normally open contact, A3-3 A3 relay 3# normally closed contact, A3-4 A3 relay 4# normally closed contact, A4 A4 relay, A4-1 A4 relay 1# normally open contact, A4-2 A4 relay 2# normally open contact, A4-3 A4 relay 3# normally closed contact, A4-4 A4 relay 4# normally closed contact, A5 A5 relay, A5-1 A5 relay 1# normally open contact, A5-2 A5 relay 2# normally open contact, A5-3 A5 relay 3# normally closed contact, A5-4 A5 relay 4# normally closed contact, A6 A6 relay, A6-1 A6 relay 1# normally open contact, A6-2 A6 relay 2# normally open contact, A6-3 A6 relay 3# normally closed contact, A6-4 A6 relay 4# normally closed contact, A7 A7 relay, A7-1 A7 relay 1# normally open contact, A7-2 A7 relay 2# normally open contact, A7-3 A7 relay 3# normally closed contact, A7-4 A7 relay 4# normally closed contact, A8 A8 relay, A8-1 A8 relay 1# normally open contact, A8-2 A8 relay 2# normally open contact, A8-3A8 relay 3# normally closed contact, A8-4 A8 relay 4# normally closed contact, A9 A9 relay, A9-1 A9 relay 1# normally open contact, A9-2 A9 relay 2# normally open contact, A9-3 A9 relay 3# normally closed contact, A9-4 A9 relay 4# normally closed contact, A-1L1 phase A connection indicator light, B-1L1 phase B connection indicator light, C-1L1 phase C connection indicator light, A-2L2 phase A connection indicator light, B-2L2 phase B connection indicator light, C-2L2 phase C connection indicator light, A-3L3 phase A connection indicator light, B-3L3 phase B connection indicator light, C-3L3 phase C connection indicator light, L1 L1 phase line, L2 L2 phase line, L3 L3 phase line, XT box, MB operation panel, AB installation plate, CT lead-in plug, YD lead-in cable, LD connecting cable, DYKZ power switch control part, L1KZ L1 phase sequence control part, L2KZ L2 phase sequence control part, L3KZ L3 phase sequence control part. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] See attached Figure 1-4A three-phase power phase sequence conversion device includes a box body XT, an operation panel MB, a mounting plate AB, an introduction plug CT, an introduction cable YD and a connecting cable LD. The operation panel MB is embedded with a power knob switch SA, a power indicator light HL, an L1 phase sequence conversion switch SA1, an L2 phase sequence conversion switch SA2, an L3 phase sequence conversion switch SA3, an L1 phase A connection indicator light A-1, an L1 phase B connection indicator light B-1, an L1 phase C connection indicator light C-1, an L2 phase A connection indicator light A-2, an L2 phase B connection indicator light B-2, an L2 phase C connection indicator light C-2, an L3 phase A connection indicator light A-3, an L3 phase B connection indicator light B-3, and an L3 phase C connection indicator light C-3. The mounting plate is fixed inside the box body. Under the working panel, a three-phase leakage protection switch QF, a power switch relay KA and A1 relay A1, A2 relay A2, A3 relay A3, A4 relay A4, A5 relay A5, A6 relay A6, A7 relay A7, A8 relay A8, A9 relay A9 are installed on the mounting plate. The electrical wiring of the device is connected according to the electrical schematic diagram. The schematic diagram includes the power switch control part DYKZ, L1 phase sequence control part L1KZ, L2 phase sequence control part L2KZ and L3 phase sequence control part L3KZ. After connecting the device to the three-phase power supply, close the three-phase leakage protection switch QF (usually normally closed), and then turn the L1 phase conversion switch, L2 phase conversion switch and L3 phase conversion switch to "power on" 2 respectively. 5 gears, the 1# terminal 1 connected to the lower end of the power switch relay KA is connected to the 2# terminal 2, the 9# terminal 9 is connected to the 10# terminal 10, and the 17# terminal 17 is connected to the 18# terminal 18. Then turn the power switch knob to the "on" 30 gear, the power switch relay KA is turned on, the power switch relay 1# normally open contact KA-1 connected to the contact L and the contact N1 is closed, the power switch relay 2# normally open contact KA-2 connected to the main power circuit is closed, the power switch relay 3# normally open contact KA-3 is closed, the power switch relay 4# normally open contact KA-4 is closed, the power indicator HL is on, and the A phase power A, B phase power B and C phase power C are loaded to the 3# terminal of the L1 phase sequence conversion switch SA1 through three normally closed contacts respectively. 3, 5# terminal 5 and 7# terminal 7, 11# terminal 11, 13# terminal 13 and 15# terminal 15 of L2 phase sequence conversion switch SA2, 19# terminal 19, 21# terminal 21 and 23# terminal 23 of L3 phase sequence conversion switch SA3, turn L1 phase sequence conversion switch SA1 to "A phase" 26 gear, 3# terminal 3 to 4# terminal 4 are turned on, A phase power supply A is loaded to A1 relay A1 through A4 relay 3# normally closed contact A4-3 and A7 relay 3# normally closed contact A7-3, A1 relay A1 is turned on, A1 relay 1# normally open contact A1-1 is closed, L1 phase A is turned on indicator light A-1, A1 relay 2# normally open contact A1-2 is closed, A phase power supply A is output to L1 phase line through this contact,The 3# normally closed contact A1-3 of the A1 relay connected to the A4 relay A4 control circuit is disconnected, the 4# normally closed contact A1-4 of the A1 relay connected to the A7 relay A7 control circuit is disconnected, and then the L2 phase sequence conversion switch SA2 is turned to the "B phase" 27 gear, 13# terminal 13 to 14# terminal 14 is turned on, and the B phase power B is loaded to the A5 relay A5 through the 3# normally closed contact A2-3 of the A2 relay and the 4# normally closed contact A8-4 of the A8 relay, the A5 relay A5 is turned on, the 1# normally open contact A5-1 of the A5 relay is closed, the L2 phase B connection indicator B-2 is on, the 2# normally open contact A5-2 of the A5 relay is closed, and the B phase power B is output to the L2 phase line through this contact, the 3# normally closed contact A5-3 of the A5 relay connected to the A2 relay A2 control circuit is disconnected, and the 4# normally closed contact A5-4 of the A5 relay connected to the A8 relay A8 control circuit Disconnect, and then turn the L3 phase sequence conversion switch SA3 to the "C phase" 28 gear, 23# terminal 23 to 24# terminal 24 is turned on, and the C phase power C is loaded to the A9 relay A9 through the A3 relay 3# normally closed contact A3-3 and the A6 relay 4# normally closed contact A6-4, the A9 relay A9 is turned on, the A9 relay 1# normally open contact A9-1 is closed, the L3 phase C connection indicator C-3 is on, the A9 relay 2# normally open contact A9-2 is closed, and the C phase power C is output to the L3 phase line through this contact, the A9 relay 3# normally closed contact A9-3 connected to the A3 relay A3 control circuit is disconnected, and the A9 relay 4# normally closed contact A9-4 connected to the A6 relay A6 control circuit is disconnected, and the A phase power A, B phase power B and C phase power C are loaded on L1, L2 and L3 respectively. By combining the three knob switches, 6 power phase sequence combinations can be output. ,

[0026] like Figure 8As shown, the power switch control part DYKZ includes a three-phase leakage protection switch QF, a power switch relay KA, a power knob switch SA and a power indicator light HL. After the three-phase leakage protection circuit breaker, the three-phase power supply is connected to the power switch relay 2# normally open contact KA-2, the power switch relay 3# normally open contact KA-3 and the power switch relay 4# normally open contact KA-4, and then connected to the L1 phase sequence conversion switch SA1, the L2 phase sequence conversion switch SA2 and the L3 phase sequence conversion switch SA3. The power indicator light HL is connected from the lower end of the power switch relay 2# normally open contact KA-2, and the power switch relay The KA control loop is connected from the A1 node at the lower end of the three-phase leakage protection circuit breaker, and is connected to the power switch relay KA through the power switch knob. Then, from the L node, it is connected in sequence to the 1# terminal 1 and 2# terminal 2 of the L1 phase sequence conversion switch SA1, the 9# terminal 9 and 10# terminal 10 of the L2 phase sequence conversion switch SA2, the 17# terminal 17 and 18# terminal 18 of the L3 phase sequence conversion switch SA3. The power switch relay 1# normally open contact KA-1 is connected between the L node and the N1 node. After the three-phase leakage protection circuit breaker is closed, the A1 node is energized. Turn the power knob switch SA to the "open" 30 position, and the power switch relay KA is energized. When the L1 phase sequence After the conversion switch SA1, L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are all turned to the "power on" 25 gear, 1# terminal 1 to 2# terminal 2 is connected, 9# terminal 9 to 10# terminal 10 is connected, 17# terminal 17 to 18# terminal 18 is connected, the power switch relay KA is turned on, the power switch relay 1# normally open contact KA-1 is closed and turned on, and the L node and N1 node are kept normally connected and self-locked. When the L1 phase sequence conversion switch SA1, L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are turned off from the "power on" 25 gear, 1# terminal 1 to 2# terminal 2 is disconnected, 9# terminal Terminals 9 to 10# are disconnected, terminals 17# to 18# are disconnected, and the power switch relay KA circuit will remain on. At the same time, the power switch relay 2# normally open contact KA-2, the power switch relay 3# normally open contact KA-3 and the power switch relay 4# normally open contact KA-4 are also closed and turned on. Phase A power, phase B power and phase C power are loaded to L1 phase sequence conversion switch SA1, L2 phase sequence conversion switch SA2, L3 phase sequence conversion switch SA3 through three normally open contacts, and the power indicator HL lights up. The power will be turned off only after the power knob switch SA is turned to the "off" 29 position.

[0027] like Figure 5As shown, L1 phase sequence conversion switch SA1, L2 phase sequence conversion switch SA2, L3 phase sequence conversion switch SA3, L1 phase sequence conversion switch SA1 has 4 gears of "power on" 25, "A phase" 26, "B phase" 27 and "C phase" 28. When the switch is turned to the "power on" gear 25, the 1# terminal 1 and the 2# terminal 2 connected to the power switch part are connected. When the switch is turned to the "A phase" gear 26, the 3# terminal 3 and the 4# terminal 4 are connected, and the A phase electricity is loaded to the 4# terminal 4. When the switch is turned to the "B phase" gear 27, the 5# terminal 5 and the 6# terminal 6 are connected, and the B phase electricity is loaded to the 6# terminal 6. When the switch is turned to the "C phase" gear 28, the 7# terminal 7 and the 8# terminal 8 are connected, and the C phase electricity is loaded to the 8# terminal 8. The L2 phase sequence conversion switch SA2 and the L3 phase sequence conversion switch SA3 have the same structure as the L1 phase sequence conversion switch SA1 ; Only when the three phase sequence conversion switches are all turned to the "power on" 25 position can the power knob switch SA be turned to the "open" 28 position, and the three-phase power can be loaded to the three phase sequence conversion switches. At this time, the three-phase power cannot be loaded to the A1 relay and other 9 relays through the three phase sequence conversion switches. If the "power on" 25 position is not designed, assuming that the three phase sequence conversion switches are all in the "A phase" 26 position when power is turned on, at the moment of power-on, the A1 relay, A4 relay A4 and A7 relay A7 will all be turned on at the same time, and the L1 phase line, L2 phase line and L3 phase line will all be A phase power supply A, which may cause certain safety hazards.

[0028] A1 relay A1, A2 relay A2, A3 relay A3, A4 relay A4, A5 relay A5, A6 relay A6, A7 relay A7, A8 relay A8 and A9 relay A9;

[0029] A1 relay A1 is connected from L1 phase sequence conversion switch SA14# terminal 4, the circuit is connected in series with A4 relay 3# normally closed contact A4-3 and A7 relay 3# normally closed contact A7-3, A1 relay 1# normally open contact A1-1 is connected to L1 phase A connection indicator light A-1 circuit, A1 relay 2# normally open contact A1-2 is connected to L1 phase line output circuit, A1 relay 3# normally closed contact A1-3 is connected in series with A4 relay A4 circuit, A1 relay 4# normally closed contact A1-4 is connected in series with A7 relay A7 circuit; the relay conduction follows the time priority principle, when L1 phase sequence conversion switch SA1 is turned to "A phase" 26 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "A phase" 26 at this time 26 gear, A4 relay 3# normally closed contact A4-3 and A7 relay 3# normally closed contact A7-3 are both closed, A phase power A will be loaded to A1 relay A1 and make it turned on, A1 relay 1# normally open contact A1-1 and A1 relay 2# normally open contact A1-2 will be closed, L1 phase A connection indicator light A-1 will light up, A phase power A will be loaded to L1 phase line output, A1 relay 3# normally closed contact A1-3 and A1 relay 4# normally closed contact A1-4 will be disconnected. If L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are turned to "A phase" 26 gear, A4 relay A4 and A7 relay A7 will not be turned on, and A phase power A cannot be loaded to L2 phase line and L3 phase line.

[0030] A2 relay A2 is connected from L1 phase sequence conversion switch SA1 6# terminal 6, the circuit is connected in series with A5 relay 3# normally closed contact A5-3 and A8 relay 3# normally closed contact A8-3, A2 relay 1# normally open contact A2-1 is connected to L1 phase B connection indicator light B-1 circuit, A2 relay 2# normally open contact A2-2 is connected to L1 phase line output circuit, A2 relay 3# normally closed contact A2-3 is connected in series with A5 relay A5 circuit, A2 relay 4# normally closed contact A2-4 is connected in series with A8 relay A8 circuit; relay conduction follows the time priority principle, when L1 phase sequence conversion switch SA1 is turned to "B phase" 27 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "B phase" 27 gear at this time, A5 relay 3# normally open contact A2-1 is connected to L1 phase B connection indicator light B-1 circuit, A2 relay 2# normally open contact A2-2 is connected to L1 phase line output circuit, A2 relay 3# normally closed contact A2-3 is connected in series with A5 relay A5 circuit, A2 relay 4# normally closed contact A2-4 is connected in series with A8 relay A8 circuit; relay conduction follows the time priority principle, when L1 phase sequence conversion switch SA1 is turned to "B phase" 27 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "B phase" 27 gear, A5 relay 3# normally closed contact A2-1 is connected to L1 phase B connection indicator light B-1 circuit, A2 relay 2# normally open contact A2-2 is connected to L1 phase line output circuit, A2 relay 3# normally closed contact A2-3 is connected in series with A5 relay A5 circuit, A2 relay 4# normally closed contact A2-4 is connected in series with A8 relay A8 circuit; relay conduction follows the time priority principle, when L1 phase sequence conversion switch SA1 is turned to "B phase" 2 When the normally closed contact A5-3 and the normally closed contact A5-3 of A8 relay 3# are both closed, the B-phase power supply B will be loaded to the A2 relay A2 and make it conductive, the A2 relay 1# normally open contact A2-1 and the A2 relay 2# normally open contact A2-2 will be closed, the L1 phase B connection indicator B-1 will light up, the B-phase power supply B will be loaded to the L1 phase line output, the A2 relay 3# normally closed contact A2-3 and the A2 relay 4# normally closed contact A2-4 will be disconnected. If the L2 phase sequence conversion switch SA2 and the L3 phase sequence conversion switch SA3 are turned to the "B phase" 27 position, neither the A5 relay A5 nor the A8 relay A8 will be conductive, and the B-phase power supply B will not be loaded to the L2 phase line and the L3 phase line.

[0031] A3 relay A3 is connected from L1 phase sequence conversion switch SA1 8# terminal 8, the circuit is connected in series with A6 relay 3# normally closed contact A6-3 and A9 relay 3# normally closed contact A9-3, A3 relay 1# normally open contact A3-1 is connected to L1 phase C connection indicator light C-1 circuit, A3 relay 2# normally open contact A3-2 is connected to L1 phase line output circuit, A3 relay 3# normally closed contact A3-3 is connected in series with A6 relay A6 circuit, A3 relay 4# normally closed contact A3-4 is connected in series with A9 relay A9 circuit; relay conduction follows the time priority principle, when L1 phase sequence conversion switch SA1 is turned to "C phase" 30 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "C phase" 30 gear at this time, A6 relay 3# When the normally closed contact A6-3 and the normally closed contact A9-3 of A9 relay 3# are both closed, the C phase power supply C will be loaded to the A3 relay A3 and make it turned on, the A3 relay 1# normally open contact A3-1 and the A3 relay 2# normally open contact A3-2 will be closed, the L1 phase C connection indicator C-1 will light up, the C phase power supply C will be loaded to the L1 phase line output, the A3 relay 3# normally closed contact A3-3 and the A3 relay 4# normally closed contact A3-4 will be disconnected. If the L2 phase sequence conversion switch SA2 and the L3 phase sequence conversion switch SA3 are turned to the "C phase" 30 position, neither the A6 relay A6 nor the A9 relay A9 will be turned on, and the C phase power supply C cannot be loaded to the L2 phase line and the L3 phase line.

[0032] like Figure 6 As shown, the A4 relay A4, A5 relay A5, A6 relay A6 and Figure 7 As shown, the A7 relay A7, A8 relay A8 and A9 relay A9 in the L3 phase sequence control circuit have the same wiring principle as the A1 relay A1, A2 relay A2 and A3 relay A3 in the L1 phase sequence control circuit. The relay conduction follows the time priority principle so that among the 9 relays from A1 relay A1 to A9 relay A9, only one relay can be turned on at any time. Whichever relay is turned on first, the other two relays cannot be turned on. The A2 relay A2, A5 relay A5 and A8 relay A8 connected to the B phase power supply B, and the A3 relay A3, A6 relay A6 and A9 relay A9 connected to the C phase power supply C are also the same. In this way, it can be ensured that at any time, only one relay will be turned on in any phase circuit, and at the same time, only one on indicator light will be on in any phase, which can avoid the safety risks caused by the disorder of the power supply phase sequence.

[0033] There are 9 connection indicator lights, L1 phase A connection indicator light A-1, L2 phase A connection indicator light A-2 and L3 phase A connection indicator light A-3 are green, L1 phase B connection indicator light B-1, L2 phase B connection indicator light B-2 and L3 phase B connection indicator light B-3 are yellow, L1 phase C connection indicator light C-1, L2 phase C connection indicator light C-2 and L3 phase C connection indicator light C-3 are red. The design can ensure that at any time, at most one indicator light of the same color can be on, which makes it convenient for users to observe the power output status and has a visual error prevention function.

Claims

1. A three-phase power supply phase sequence conversion device, characterized in that: It includes a box body, an operation panel, and a mounting plate; the operation panel is embedded with a power knob switch, an L1 phase sequence conversion switch, an L2 phase sequence conversion switch, and an L3 phase sequence conversion switch; the mounting plate is fixed under the operation panel inside the box body, and a power control circuit, an L1 phase sequence control circuit, an L2 phase sequence control circuit, and an L3 phase sequence control circuit are arranged on the mounting plate; the power control circuit is connected to the power knob switch, and the power control circuit and the A phase, B phase, and C phase power supply are controlled by the power knob switch. The L1 phase sequence control circuit, the L2 phase sequence control circuit, and the L3 phase sequence control circuit are respectively connected to the A phase, the B phase, and the C phase through the power control circuit, and the L1 phase sequence control circuit, the L2 phase sequence control circuit, and the L3 phase sequence control circuit are respectively electrically connected to different phases of the A phase, the B phase, and the C phase at the same time through the L1 phase sequence conversion switch, the L2 phase sequence conversion switch, and the L3 phase sequence conversion switch.

2. A three-phase power supply phase sequence conversion device according to claim 1, characterized in that: The operation panel also includes a power indicator light; an L1 phase A on indicator light, an L1 phase B on indicator light, and an L1 phase C on indicator light; an L2 phase A on indicator light, an L2 phase B on indicator light, and an L2 phase C on indicator light; an L3 phase A on indicator light, an L3 phase B on indicator light, and an L3 phase C on indicator light; the power indicator light is connected to the power control circuit to indicate the on and off of the A phase, B phase, and C phase power supplies; the L1 phase A on indicator light, the L1 phase B on indicator light, and the L1 phase C on indicator light are connected to the L1 phase sequence control circuit to indicate the connected phase of the L1 phase sequence control circuit; the L2 phase A on indicator light, the L2 phase B on indicator light, and the L2 phase C on indicator light are connected to the L2 phase sequence control circuit to indicate the connected phase of the L2 phase sequence control circuit; the L3 phase A on indicator light, the L3 phase B on indicator light, and the L3 phase C on indicator light are connected to the L3 phase sequence control circuit to indicate the connected phase of the L3 phase sequence control circuit.

3. A three-phase power supply phase sequence conversion device according to claim 1, characterized in that: The power control circuit includes a three-phase leakage protection switch and a power switch relay. After the three-phase power supply passes through the three-phase leakage protection circuit breaker, it is connected to the power switch relay 2# normally open contact, the power switch relay 3# normally open contact and the power switch relay 4# normally open contact, and then connected to the L1 phase sequence conversion switch, the L2 phase sequence conversion switch and the L3 phase sequence conversion switch. The power indicator light is connected from the lower end of the power switch relay 2# normally open contact. The power switch relay control loop is connected from the A1 node at the lower end of the three-phase leakage protection circuit breaker, connected to the power switch relay through the power switch knob, and then connected from the L node in sequence to the 1# terminal and the 2# terminal of the L1 phase sequence conversion switch, the 9# terminal and the 10# terminal of the L2 phase sequence conversion switch, and the 17# terminal and the 18# terminal of the L3 phase sequence conversion switch. The power switch relay 1# normally open contact is connected between the L node and the N1 node. After the three-phase leakage protection circuit breaker is closed, the A1 node is energized, and the power knob switch is turned to the "on" position, and the power switch relay When the L1 phase sequence conversion switch, L2 phase sequence conversion switch and L3 phase sequence conversion switch are all turned to the "power on" position, the 1# terminal to the 2# terminal is connected, the 9# terminal to the 10# terminal is connected, the 17# terminal to the 18# terminal is connected, the power switch relay is turned on, the 1# normally open contact of the power switch relay is closed and turned on, and the L node and the N1 node are kept normally connected and self-locking. When the L1 phase sequence conversion switch, L2 phase sequence conversion switch and L3 phase sequence conversion switch are turned from the "power on" position to the "power on" position, the 1# terminal to the 2# terminal is connected, the 9# terminal to the 10# terminal is connected, the 17# terminal to the 18# terminal is connected, the power switch relay is turned on, and the 1# normally open contact of the power switch relay is closed and turned on, and the L node and the N1 node are kept normally connected and self-locking is formed. After the first position is opened, the 1# terminal to the 2# terminal is disconnected, the 9# terminal to the 10# terminal is disconnected, and the 17# terminal to the 18# terminal is disconnected. The power switch relay circuit will remain on. At the same time, the power switch relay 2# normally open contact, the power switch relay 3# normally open contact and the power switch relay 4# normally open contact are also closed and turned on. The A phase power supply, the B phase power supply and the C phase power supply are loaded to the L1 phase sequence conversion switch, the L2 phase sequence conversion switch, and the L3 phase sequence conversion switch through the three normally open contacts.

4. A three-phase power supply phase sequence conversion device according to claim 3, characterized in that: L1 phase sequence conversion switch, L2 phase sequence conversion switch, L3 phase sequence conversion switch, L1 phase sequence conversion switch includes 4 gears: "power on", "A phase", "B phase" and "C phase". When the switch is turned to the "power on" gear, the 1# terminal and the 2# terminal connected to the power switch part are connected. When the switch is turned to the "A phase" gear, the 3# terminal and the 4# terminal are connected, and the A phase electricity is loaded to the 4# terminal. When the switch is turned to the "B phase" gear, the 5# terminal and the 6# terminal are connected, and the B phase electricity is loaded to the 6# terminal. When the switch is turned to the "C phase" gear, the 7# terminal and the 8# terminal are connected, and the C phase electricity is loaded to the 8# terminal. The L2 phase sequence conversion switch and the L3 phase sequence conversion switch have the same structure as the L1 phase sequence conversion switch. Only when all three phase sequence conversion switches are turned to the "power on" gear can the power knob switch be turned to the "on" gear, and the three-phase power can be loaded to the three phase sequence conversion switches.

5. A three-phase power supply phase sequence conversion device according to claim 1, characterized in that: The L1 phase sequence control circuit includes A1 relay, A2 relay, and A3 relay; the L2 phase sequence control circuit includes A4 relay A4, A5 relay A5, and A6 relay A6; the L3 phase sequence control circuit includes A7 relay A7, A8 relay A8, and A9 relay A9.

6. A three-phase power supply phase sequence conversion device according to claim 5, characterized in that: A1 relay A1 is connected from L1 phase sequence conversion switch SA14# terminal 14, the circuit is connected in series with A4 relay 3# normally closed contact A4-3 and A7 relay 3# normally closed contact A7-3, A1 relay 1# normally open contact A1-1 is connected to L1 phase A connection indicator light A-1 circuit, A1 relay 2# normally open contact A1-2 is connected to L1 phase line output circuit, A1 relay 3# normally closed contact A1-3 is connected in series with A4 relay A4 circuit, A1 relay 4# normally closed contact A1-4 is connected in series with A7 relay A7 circuit; the relay conduction follows the time priority principle. When L1 phase sequence conversion switch SA1 is turned to "A phase" A phase 26 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "A phase" A phase at this time ”26 gear, A4 relay 3# normally closed contact A4-3 and A7 relay 3# normally closed contact A7-3 are both closed, A phase power A will be loaded to A1 relay A1 and make it turned on, A1 relay 1# normally open contact A1-1 and A1 relay 2# normally open contact A1-2 will be closed, L1 phase A connection indicator A-1 will light up, A phase power A will be loaded to L1 phase line output, A1 relay 3# normally closed contact A1-3 and A1 relay 4# normally closed contact A1-4 will be disconnected,, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are turned to "A phase" A phase 26 gear, A4 relay A4 and A7 relay A7 will not be turned on, and A phase power A cannot be loaded to L2 phase line and L3 phase line.

7. A three-phase power supply phase sequence conversion device according to claim 5, characterized in that: A2 relay A2 is connected from L1 phase sequence conversion switch SA1 6# terminal 6, the circuit is connected in series with A5 relay 3# normally closed contact A5-3 and A8 relay 3# normally closed contact A8-3, A2 relay 1# normally open contact A2-1 is connected to L1 phase B connection indicator light B-1 circuit, A2 relay 2# normally open contact A2-2 is connected to L1 phase line output circuit, A2 relay 3# normally closed contact A2-3 is connected in series with A5 relay A5 circuit, A2 relay 4# normally closed contact A2-4 is connected in series with A8 relay A8 circuit; relay conduction follows the time priority principle. When L1 phase sequence conversion switch SA1 is turned to "B phase" 27 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "B phase" 27 gear at this time, A5 relay 3 #Normally closed contact A5-3 and A8 relay 3#normally closed contact A5-3 are both closed, B-phase power supply B will be loaded to A2 relay A2 and make it turned on, A2 relay 1#normally open contact A2-1 and A2 relay 2#normally open contact A2-2 will be closed, L1 phase B connection indicator B-1 will light up, B-phase power supply B will be loaded to L1 phase line output, A2 relay 3#normally closed contact A2-3 and A2 relay 4#normally closed contact A2-4 will be disconnected. If L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are turned to B phase 27 position, A5 relay A5 and A8 relay A8 will not be turned on, and B-phase power supply B cannot be loaded to L2 phase line and L3 phase line.

8. A three-phase power supply phase sequence conversion device according to claim 5, characterized in that: A3 relay A3 is connected from L1 phase sequence conversion switch SA1 8# terminal 8, the circuit is connected in series with A6 relay 3# normally closed contact A6-3 and A9 relay 3# normally closed contact A9-3, A3 relay 1# normally open contact A3-1 is connected to L1 phase C connection indicator C-1 circuit, A3 relay 2# normally open contact A3-2 is connected to L1 phase line output circuit, A3 relay 3# normally closed contact A3-3 is connected in series with A6 relay A6 circuit, A3 relay 4# normally closed contact A3-4 is connected in series with A9 relay A9 circuit; relay conduction follows the time priority principle, when L1 phase sequence conversion switch SA1 is turned to "C phase" 30 gear, if L2 phase sequence conversion switch SA2 and L3 phase sequence conversion switch SA3 are not in "C phase" 30 gear at this time, A6 relay 3# When the normally closed contact A6-3 and the normally closed contact A9-3 of A9 relay 3# are both closed, the C phase power supply C will be loaded to the A3 relay A3 and make it turned on, the A3 relay 1# normally open contact A3-1 and the A3 relay 2# normally open contact A3-2 will be closed, the L1 phase C connection indicator C-1 will light up, the C phase power supply C will be loaded to the L1 phase line output, the A3 relay 3# normally closed contact A3-3 and the A3 relay 4# normally closed contact A3-4 will be disconnected. If the L2 phase sequence conversion switch SA2 and the L3 phase sequence conversion switch SA3 are turned to the "C phase" 30 position, neither the A6 relay A6 nor the A9 relay A9 will be turned on, and the C phase power supply C cannot be loaded to the L2 phase line and the L3 phase line.

9. A three-phase power supply phase sequence conversion device according to claim 2, characterized in that: The L1 phase A on indicator light, the L2 phase A on indicator light and the L3 phase A on indicator light are green, the L1 phase B on indicator light, the L2 phase B on indicator light and the L3 phase B on indicator light are yellow, and the L1 phase C on indicator light, the L2 phase C on indicator light and the L3 phase C on indicator light are red.

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