Fast three-phase dual power supply transfer switch

Abstract

The present invention belongs to the technical field of intelligent electrical equipment, and specifically relates to a fast three-phase dual-power conversion switch, which includes a lower case and an upper case. Input terminal connection terminals, current transformers, electromagnet motion groups, common-end electromagnet support plates, rubber pads, power-off locking groove groups, arc extinguishing chamber groups, static contact substrate groups, static contact insulating covers, large-current detection transformers, and output terminal connection terminals are successively installed on the lower case. A control circuit board is also installed between the upper case and the lower case. It can complete power conversion without power interruption to the load; it has the advantages of STS and ATS, with a fast conversion speed <20ms (without power interruption to the load), the load conversion execution unit is a mechanical structure with strong load-carrying capacity, stable and reliable operation, long service life, has a mechanical interlocking mechanism, does not consume the electric energy of the main circuit during normal operation of the switch, and has a low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent electrical equipment, and particularly relates to a fast three-phase dual-power conversion switch. Background Art

[0002] A dual-power switching switch is a switch that automatically switches from a normal power supply to a backup power supply due to a power failure, and is widely used in some important electrical circuits that do not allow power outages, such as hospitals, airports, large-scale production, banks, high-rise buildings, and military facilities.

[0003] Dual-power switching switches are divided into two categories: STS static transfer switches and ATS automatic transfer switches.

[0004] STS (Static Transfer Switch), also known as a static transfer switch, is a power supply one-for-one automatic switching system. When the first circuit fails, the STS automatically switches to the second circuit to supply power to the load. When the second circuit fails, the STS automatically switches to the first circuit to supply power to the load. The prerequisite for the above switching is that the backup circuit power is normal and basically synchronized with the faulty circuit power. The STS static transfer switch is more suitable for uninterrupted power conversion between any two power supplies such as UPS-UPS, UPS-generator, UPS-mains power, and mains power-mains power. The common STS static transfer switch mainly uses high-speed thyristors as the power switching execution unit, and its standard switching time ≤ 8ms. It can reliably supply power to the load while ensuring the safety of power switching between different circuits. The disadvantages of high-speed thyristors are poor surge resistance, overcurrent and overvoltage tolerance; high power consumption and serious heating during use, and short service life.

[0005] ATS (Automatic transfer switching equipment) automatic transfer switch is mainly used in emergency power supply systems. It is a switching electrical appliance that automatically switches the load circuit from one power supply to another (backup) power supply to ensure continuous and reliable operation of important loads. It is suitable for lighting and motor loads. The commonly used ATS automatic transfer switch adopts a mechanical structure, and the conversion time is more than 100ms. The disadvantages are: load power-off will occur during conversion. Summary of the Invention

[0006] Aiming at the deficiencies of the above problems, the purpose of the present invention is to provide a fast three-phase dual-power conversion switch that can complete power conversion without power interruption of the load; having the advantages of STS and ATS, fast conversion speed < 20ms (load without power interruption), the load conversion execution unit is a mechanical structure with strong load-carrying capacity, stable and reliable operation, long service life, having a mechanical interlock mechanism, no power loss in the main circuit during normal operation of the switch, and low cost.

[0007] The present invention is realized through the following technical solutions: A fast three-phase dual-power conversion switch, including a lower housing and an upper housing, is characterized in that an input terminal block, a current transformer, an electromagnet movement group, a normal-end electromagnet support plate, a rubber pad, a power-off locking groove group, an arc extinguishing chamber group, a static contact substrate group, a static contact insulating cover, a large-current detection transformer, and an output terminal block are sequentially installed on the lower housing, and a control circuit board is also installed between the upper housing and the lower housing.

[0008] Preferably, the electromagnet movement group includes a normal-end closing electromagnet group composed of a normal-end closing electromagnet one and a normal-end closing electromagnet two, a standby-end closing electromagnet group composed of a standby-end closing electromagnet one and a standby-end closing electromagnet two, and a tripping electromagnet; the normal-end closing electromagnet group and the tripping electromagnet are installed on the lower housing through the normal-end electromagnet support plate; the standby-end closing electromagnet group is also installed on the lower housing.

[0009] The lower ends of the armatures of the four electromagnets included in the normal-end closing electromagnet group and the standby-end closing electromagnet group are connected to a guide rod; the guide rod is provided with a long slot rod, a moving head slide group is arranged below the guide rod, the moving head slide group is composed of several moving head slides, a moving contact substrate is arranged under each moving head slide, a static contact substrate group is correspondingly installed directly below the moving contact substrate, a large-current detection transformer (with functions of detecting overload and short circuit) is arranged below the static contact substrate group, and an output terminal block is arranged below the large-current detection transformer; the lower end of the armature of the tripping electromagnet is equipped with a power-off push head; the power-off locking groove group includes a guide rail fixing plate, a guide rail, a slider, and a locking groove, the guide rail fixing plate is installed on the lower housing, the guide rail is installed below the guide rail fixing plate, the slider is installed below the guide rail, the upper part of the slider is slidably embedded in the guide rail, the lower part of the slider is fixedly connected to the locking groove, a short slot rod is arranged in the locking groove, slot holes for the power-off rod push head to pass through are arranged on both the guide rail fixing plate and the locking groove, the power-off rod push head sequentially passes through the slot holes of the guide rail fixing plate and the locking groove and contacts the short slot rod, and a slot for blocking the return action after the long slot rod is wedged and energized is also arranged on the locking groove.

[0010] Preferably, the five electromagnets included in the electromagnet movement group are installed on the lower housing, and rubber pads are installed between the electromagnets and the lower housing.

[0011] Preferably, anti-moving sliding pieces are respectively installed on both side surfaces of the locking groove, anti-moving sliding piece travel grooves are arranged on the anti-moving sliding pieces, the anti-moving sliding piece fixing blocks pass through the anti-moving sliding piece travel grooves to install the anti-moving sliding pieces on both side surfaces of the locking groove, and the anti-moving sliding pieces move back and forth along the front side of the locking groove within the travel range of the anti-moving sliding piece travel grooves.

[0012] Preferably, a micro switch is also arranged on the locking groove, a power-off self-locking knob is arranged directly in front of the micro switch, and the power-off self-locking knob is installed on the upper housing through a rotating fixing sleeve.

[0013] Preferably, an arc extinguishing chamber group is provided at the connection part between the moving head slide and the guide rod. The arc extinguishing chamber group consists of an upper arc extinguishing chamber plate, a lower arc extinguishing chamber shell connected to the upper arc extinguishing chamber plate, and an arc extinguishing grid group installed on the lower arc extinguishing chamber shell. Each arc extinguishing grid group consists of eight grid pieces, one bottom grid piece, and two grid piece separator plates. The upper arc extinguishing chamber plate is provided with honeycomb-shaped heat dissipation holes.

[0014] Preferably, a overtravel spring is provided between the bottom of the guide rod and each moving head slide for connection. A locking groove is provided at the top of each moving head slide, and the locking groove is inserted into the guide rod through a trapezoidal pin.

[0015] Preferably, a contact is provided between the moving contact substrate and the static contact substrate group. The static contact substrate group includes a static contact substrate. Silver points are welded to both the static contact substrate and the moving contact substrate. The moving head slide is fixedly connected below the moving contact substrate. The static contact substrate is installed on the lower shell through mounting threaded holes.

[0016] Preferably, the input terminal and the moving contact substrate are connected by a flexible wire, and the static contact substrate and the output terminal are connected by a flexible wire. When the moving contact substrate and the static contact substrate are in contact, the switch is closed and powered on.

[0017] Preferably, an operation panel is provided on the upper shell, and an operation panel isolation plate for preventing interference of electrical components is installed behind the operation panel. A power failure indicator is provided on the operation panel, and the power failure indicator is connected to a micro switch; an information acquisition and control module is provided on the control circuit board, and the control circuit board is also connected to the operation panel, current transformer, electromagnet movement group, micro switch, and high current detection transformer respectively.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention has low cost, simple structure, stable and reliable operation, and long service life.

[0020] 2. The present invention realizes power-on or power-off operations through the cooperation of an electric control electromagnet and a mechanical action, and the switching time is short < 20ms (load without power interruption), which ensures the operation stability of the load current. At the same time, it also increases the switching current in the load circuit and improves the load-bearing capacity.

[0021] 3. The present invention realizes the redundancy of a main and a standby dual power supply through the mutual switching of a common electromagnet and a standby electromagnet, making the operation of the load circuit more secure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present invention;

[0023] Figure 2Schematic diagram of the lower shell structure of the present invention;

[0024] Figure 3 Schematic diagram of the electromagnet motion group structure of the present invention;

[0025] Figure 4 Schematic diagram of the moving head slide group structure of the present invention;

[0026] Figure 5 Schematic diagram of the power-off locking groove group structure of the present invention;

[0027] Figure 6 Schematic diagram of the arc extinguishing chamber group structure of the present invention;

[0028] Figure 7 Schematic diagram of the static contact substrate group structure of the present invention;

[0029] Figure 8 Schematic diagram of the upper shell structure of the present invention;

[0030] Accompanying drawings, 01 lower shell, 02 upper shell, 03 control panel, 04 power-off self-locking knob, 05 output terminal connection terminal, 06 input terminal connection terminal, 0101 current transformer, 0102 electromagnet motion group, 0103 power-off locking groove group, 0104 arc extinguishing chamber group, 0105 static contact substrate group, 0106 large current detection transformer, 0107 static contact insulating cover, 0108 common end closing electromagnet support plate, 0109 rubber pad, 010201 armature, 010202 standby end closing electromagnet one, 010203 standby end closing electromagnet two, 010204 common end closing electromagnet one, 010205 common end closing electromagnet two, 010206 tripping electromagnet, 010107 guide rod, 010208 long slot rod, 010209 trapezoidal pin, 010210 moving head slide group, 010213 power-off push head; 01021001 moving head slide, 01021002 moving contact substrate, 01021003 silver point, 01021005 locking groove; 010301 guide rail fixing plate, 010302 guide rail, 010303 slider, 010304 locking groove, 010305 micro switch, 010307 slot, 010308 anti-moving slide, 010309 anti-moving slide fixing block, 010310 anti-moving slide stroke slot, 010311 short slot rod; 010401 arc extinguishing chamber upper plate, 010402 arc extinguishing chamber bottom shell, 010403 bottom grid, 010404 grid, 010405 grid isolation plate, 010406 honeycomb-shaped heat dissipation holes; 010501 static contact substrate, 010503 anti-magnetic arc; 0201 control panel isolation plate, 0202 control panel, 0203 rotation fixing groove, 0204 rotation fixing sleeve. Detailed implementation manners

[0031] The invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

[0032] As Figures 1 to 8 , the fast three-phase dual-power conversion switch of the present invention includes a lower case 01 and an upper case 02. An input terminal connection terminal 06, a current transformer 0101, an electromagnet movement group 0102, a normal closing electromagnet support plate 0108, a rubber pad 0109, a power-off locking groove group 0103, an arc extinguishing chamber group, a static contact substrate group 0105, a static contact insulating cover 0107, a large current detection transformer 0106, and an output terminal connection terminal 05 are successively installed on the lower case 01. A control circuit board is also installed between the upper case 02 and the lower case 01.

[0033] As Figure 3 shown, the electromagnet movement group 0102 includes a normal closing electromagnet group composed of a normal closing electromagnet one 010204 and a normal closing electromagnet two 010205, a standby closing electromagnet group composed of a standby closing electromagnet one 010202 and a standby closing electromagnet two 010203, and a tripping electromagnet; the normal closing electromagnet group is installed on the lower case 01 through the normal closing electromagnet support plate 0108, and the standby closing electromagnet group and the tripping electromagnet are also installed on the lower case 01; the above five electromagnets are all electronically controlled electromagnets and are all installed on the lower case 01 through the rubber pad 0109.

[0034] The lower ends of the armatures 010201 of the four electromagnets included in the normal closing electromagnet group and the standby closing electromagnet group are connected to a guide rod 010207; the normal closing electromagnet group is connected to the normal closing guide rod 010207, and the standby closing electromagnet group is connected to a standby guide rod 010207 with the same structure as the normal closing one. Each guide rod 010207 is provided with a long slot rod 010208 inside. The long slot rod 010208 is a pre-embedded part during the casting of the guide rod 010207. There are also 4 pre-embedded part trapezoidal pins 010209 on the guide rod 010207. A moving head slide group 010210 is provided below the guide rod 010207. The moving head slide group 010210 is composed of 4 moving head slide groups 010210. As Figure 4As shown in the figure, each moving head slide 01021001 is provided with a locking slot 01021005 for hanging the guide rod 010207. The locking slot 01021005 is inserted on the guide rod 010207 through a trapezoidal pin 010209. There is also an over-travel spring between the bottom of the guide rod 010207 and each moving head slide 01021001, that is, the bottom of the guide rod 010207 is connected to the moving head slide 01021001 through the over-travel spring. A moving contact substrate 01021002 is correspondingly provided under each moving head slide 01021001, and a static contact substrate group 0105 is correspondingly installed directly below each moving contact substrate 01021002. A self-powered current transformer 0101 is provided under the static contact substrate group 0105, and an output terminal 05 is provided under the self-powered current transformer 0101.

[0035] The lower end of the armature 010201 of the opening solenoid is equipped with a power-off push head 010213, as Figure 5 shown, the power-off locking slot group 0103 includes a guide rail fixing plate 010301, a guide rail, a slider 010303 and a locking slot 010304. The guide rail fixing plate 010301 is installed on the lower shell 01. The guide rail is installed under the guide rail fixing plate 010301, and the slider 010303 is installed under the guide rail. The upper part of the slider 010303 is slidably fitted into the guide rail so that the slider 010303 can move back and forth along the guide rail. The lower part of the slider 010303 is fixedly connected to the locking slot 010304. A short slot rod 010311 is provided in the locking slot 010304. Threaded holes are respectively provided on the left and right sides of the locking slot 010304. Threads are provided at both ends of the short slot rod 010311. The short slot rod 010311 is installed in the locking slot 010304 through threaded connection with the threaded holes. Slot holes for the power-off rod push head to pass through are provided in the middle of the guide rail fixing plate 010301 and the locking slot 010304. The power-off rod push head passes through the slot holes of the guide rail fixing plate 010301 and the locking slot 010304 in sequence and contacts and acts on the short slot rod 010311. That is, when the opening solenoid 010206 acts, the power-off rod push head acts to push the short slot rod 010311 to act, thereby driving the locking slot 010304 to move backward and realizing tripping.

[0036] Two front and rear slots are also provided on the locking slot 010304 to block the return action of the long slot rod 010208 after being wedged and energized, which respectively act on the long slot rod 010208 at the normal end and the long slot rod 010208 at the standby end.

[0037] On both sides of the locking groove 010304, anti-moving sliding plates 010308 are respectively installed. An anti-moving sliding plate travel groove 010310 is provided on the anti-moving sliding plate 010308. The anti-moving sliding plate fixing block 010309 passes through the anti-moving sliding plate travel groove 010310 to install the anti-moving sliding plate 010308 on both sides of the locking groove 010304. The anti-moving sliding plate 010308 moves back and forth along the side of the locking groove 010304 within the travel range of the anti-moving sliding plate travel groove 010310. The function of the anti-sliding plate is to limit the vertical displacement of the long card slot rod 010208 through cooperation with the card slot of the locking groove 010304, so that the main power supply and the standby power supply form an interlocking relationship and cannot be closed simultaneously.

[0038] A return spring is also provided inside the lower shell 01. The locking groove 010304 is connected to the lower shell 01 through the return spring, so that the locking groove 010304 automatically rebounds without the acting force of the long card slot rod 010208 or the short card slot rod 010311.

[0039] A micro switch 010305 is provided on the locking groove 010304. A power-off self-locking knob 04 is provided directly in front of the micro switch 010305. The power-off self-locking knob 04 is installed on the upper shell 02 through the rotating fixing sleeve 0204 and the characteristic rotating fixing groove 0203 of the upper shell 02. For safety and to prevent accidental touch, a protective cover is also covered outside the power-off self-locking knob 04. Press the power-off self-locking knob 04. The power-off self-locking knob 04 first touches the micro switch 010305. The micro switch 010305 closes to light up the stop line signal lamp on the control panel and sends a signal to the control circuit board to temporarily disconnect the remote control function. Then the locking groove 010304 contacts and pushes the locking groove 010304 to move backward. The long card slot rod 010208 loses the restriction of the locking groove 010304 and trips. At this time, the armature of the normally used end energized electromagnet group rebounds to drive the guide rod 010207 to move upward to achieve power-off.

[0040] A pin arc chamber group is provided at the connection part of the moving head slide base 01021001 and the guide rod 010207, as Figure 6 shown. The pin arc chamber group is composed of a pin arc chamber upper plate 010401, a pin arc chamber bottom shell 01010402 connected to the pin arc chamber upper plate 010401, and a pin arc grid group installed on the bottom shell 010402 of the pin arc chamber lower shell. Each said pin arc grid group is composed of eight grid pieces 010404, one bottom grid piece 010403, and two grid piece separator plates 010405. The pin arc chamber upper plate 01040401 is provided with honeycomb-shaped heat dissipation holes 010406.

[0041] The moving contact substrate 01021002 and the static contact substrate group 0105 are of a double-contact structure, as Figure 7As shown in the figure, the static contact substrate group 0105 includes a static contact substrate 010501. Silver points 01021003 are welded on both the static contact substrate 010501 and the moving contact substrate 01021002. The moving contact substrate 01021002 is fixedly connected to the moving head slide 01021001 by a rivet. The static contact substrate 010501 is installed on the lower case 01 through mounting threaded holes. The static contact substrate group 0105 is covered with a static contact insulating cover 0107; as Figure 8 shown, the input terminal 06 and the moving contact substrate 01021002 are connected by a flexible wire. The static contact substrate 010501 and the output terminal 05 are connected by a flexible wire. When the moving contact substrate 01021002 contacts the static contact substrate 010501, the change-over switch is closed and energized. When the moving and static contact substrates 010501 are separated, the change-over switch is disconnected.

[0042] The upper case 02 is provided with an operating panel 020203 with a display function. An operating panel 020203 isolation plate for preventing interference of electrical components is installed behind the operating panel 020203. The operating panel 020203 is provided with a power failure indicator for displaying the status of the fast three-phase dual power supply change-over switch. The power failure indicator is connected to a micro switch 010305.

[0043] The control circuit board is provided with an information acquisition and control module, and also an Internet of Things module for real-time monitoring of the device status and fault alarm. The control circuit board is also respectively connected to the operating panel 020203, the current transformer 0101, the electromagnet movement group 0102, the micro switch 010305, and the large current detection transformer 0106; according to the signal detected by the current transformer 0101, it is transmitted to the control board, and the control board controls the opening and closing actions of the electromagnet according to the signal. The micro switch 010305 transmits the closing signal to the control board, and the control board disconnects the Internet of Things online control function according to the signal of the micro switch 010305.

[0044] Closing action of the normal power supply: The electromagnet in the normal-end closing electromagnet group is energized, and the armature pushes the guide rod 010207 of the normal end to move vertically downward by a stroke of 8 mm. At this time, the moving contact substrate 01021002 and the static contact substrate 010501 are in contact and connected, and the normal power supply is in the energized state. Since the impact potential energy of the electromagnet has not completely disappeared, the guide rod 010207 continues to move downward by a stroke of 7 mm. At this time, the over-travel spring between the moving head slide 01021001 and the guide rod 010207 is in a compressed state, and the long slot rod 010208 of the normal end is locked by the slot lock of the lock slot 010304 and cannot rebound upward. At this time, the entire closing action of the normal power supply is completed.

[0045] Closing operation of the backup power supply: The closing movement of the closing electromagnet group at the backup end is the same as that of the closing electromagnet group at the normal end; that is, the electromagnet in the backup electromagnet is energized, and the armature pushes the guide rod 010207 at the backup end to move vertically downward by 8 mm to form a state. At this time, the moving contact substrate 01021002 on the backup electromagnet side contacts and connects with the static contact substrate 010501, and the backup power switch is in the energized state. According to the impact potential energy of the electromagnet, the guide rod 010207 continues to move downward by a stroke of 7 mm. At this time, the over-travel spring between the moving head slide 01021001 and the guide rod 010207 at the backup end is in a compressed state, and the long slot rod 010208 at the backup end is locked by the slot lock on the other side of the locking slot 010304 and cannot rebound and move upward. The entire closing operation of the backup power supply is completed.

[0046] When the normal power supply is energized, one end of the anti-sliding piece contacts the long slot rod 010208 at the normal end, and the other end cooperates with the slot of the locking slot 010304 to limit the vertical displacement of the long slot rod 010208 at the backup end, ensuring that the backup power supply is disconnected and preventing the phenomenon of simultaneous engagement of the dual power supplies.

[0047] Power-off opening operation: The opening electromagnet 010206 is energized, and the armature pushes the power-off rod push head to move downward. The inclined surface of the short slot rod 010311 fits with the inclined surface of the power-off rod push head, and the power-off rod push head pushes the short slot rod 010311 to move backward, thereby driving the locking slot 010304 to move backward, causing the common long slot rod 010208 to lose the restriction of the locking slot 010304 and trip and reset. At this time, the over-travel spring in the moving head slide 01021001 returns to its original state, and the moving contact substrate 01021002 is separated from the static contact substrate 010501.

[0048] Manual power-off mechanism: Press the power-off self-locking knob 04. The power-off self-locking knob 04 first touches the micro switch 010305 to send a signal to the control board, suspending the function of the control board for online control through the Internet of Things. At the same time, the power-off indicator light on the control panel 020203 is lit. The power-off self-locking knob 04 also contacts the locking slot 010304 and pushes the locking slot 010304 to move backward. The long slot rod 010208 loses the restriction of the locking slot 010304 and trips. At this time, the armature of the normal-end closing electromagnet rebounds and drives the guide rod 010207 to move upward to achieve opening.

[0049] Switching between the normal power supply and the backup power supply: When the normal power supply is in use, when the current transformer 0101 detects an abnormality in the circuit, it immediately sends a power-off signal to the circuit board. After receiving the power-off signal, the circuit board energizes the opening electromagnet 010206 to operate and achieve power-off. After the power-off is completed, the circuit board then sends a control signal to the backup-end closing electromagnet group, and the backup-end closing electromagnet one and the backup-end closing electromagnet two are energized to operate to achieve closing.

[0050] Except for the technical features described in the specification, the remaining technical features are all well-known technologies to those skilled in the art.

Claims

1. A fast three-phase dual power supply transfer switch, comprising a lower case and an upper case, characterized in that, An input terminal block, a current transformer, an electromagnet motion group, a normally-closed electromagnet support plate, a rubber pad, a power-off locking groove group, an arc extinguishing chamber group, a static contact substrate group, a static contact insulating cover, a large-current detection transformer, and an output terminal block are successively installed on the lower case. A control circuit board is also installed between the upper case and the lower case. The electromagnet motion group includes a normally-closed closing electromagnet group composed of a normally-closed closing electromagnet 1 and a normally-closed closing electromagnet 2, a standby closing electromagnet group composed of a standby closing electromagnet 1 and a standby closing electromagnet 2, and a tripping electromagnet. The normally-closed closing electromagnet group and the tripping electromagnet are installed on the lower case through the normally-closed electromagnet support plate. The standby closing electromagnet group is also installed on the lower case. The lower ends of the armatures of the four electromagnets included in the normally-closed closing electromagnet group and the standby closing electromagnet group are connected to a guide rod. The guide rod is provided with a long slot rod. A moving head slide group is arranged below the guide rod. The moving head slide group is composed of several moving head slides. A moving contact substrate is arranged below each moving head slide. A static contact substrate group is correspondingly installed directly below the moving contact substrate. A large-current detection transformer is arranged below the static contact substrate group. An output terminal block is arranged below the large-current detection transformer. A power-off push head is installed at the lower end of the armature of the tripping electromagnet. The power-off locking groove group includes a guide rail fixing plate, a guide rail, a slider, and a locking groove. The guide rail fixing plate is installed on the lower case. The guide rail is installed below the guide rail fixing plate. The slider is installed below the guide rail. The upper part of the slider is slidably fitted into the guide rail. The lower part of the slider is fixedly connected to the locking groove. A short slot rod is arranged in the locking groove. Through holes for the power-off push head to pass through are arranged on both the guide rail fixing plate and the locking groove. The power-off push head successively passes through the through holes of the guide rail fixing plate and the locking groove and contacts the short slot rod. A slot is also arranged on the locking groove to block the return action of the long slot rod after wedging when powered on. A return spring is further arranged in the lower case. The locking groove is connected to the lower case through the return spring, so that the locking groove automatically rebounds without the action of the long slot rod or the short slot rod.

2. A fast three-phase dual power supply transfer switch according to claim 1, characterized in that, The five electromagnets included in the electromagnet motion group are installed on the lower case. Rubber pads are installed between the electromagnets and the lower case.

3. A fast three-phase dual power supply transfer switch according to claim 1, characterized in that, Anti-moving sliding pieces are respectively installed on both side surfaces of the locking groove. Anti-moving sliding piece travel grooves are arranged on the anti-moving sliding pieces. The anti-moving sliding piece fixing blocks pass through the anti-moving sliding piece travel grooves and install the anti-moving sliding pieces on both side surfaces of the locking groove. The anti-moving sliding pieces move back and forth along the side surface of the locking groove within the travel range of the anti-moving sliding piece travel grooves.

4. A fast three-phase dual-power conversion switch according to claim 1, characterized in that, A micro switch is also arranged on the locking groove. A power-off self-locking knob is arranged directly in front of the micro switch. The power-off self-locking knob is installed on the upper case through a rotating fixing sleeve.

5. A fast three-phase dual power supply transfer switch according to claim 2, characterized in that, An arc extinguishing chamber group is arranged at the connection part between the moving head slide and the guide rod. The arc extinguishing chamber group is composed of an arc extinguishing chamber upper plate, an arc extinguishing chamber lower case connected to the arc extinguishing chamber upper plate, and an arc extinguishing grid group installed on the arc extinguishing chamber lower case. Each arc extinguishing grid group is composed of eight grid pieces, one bottom grid piece, and two grid piece separator plates. Honeycomb-shaped heat dissipation holes are arranged on the arc extinguishing chamber upper plate.

6. A fast three-phase dual power supply transfer switch according to claim 2, characterized in that An over-travel spring is provided between the bottom of the guide rod and each moving head slide for connection. A locking groove is provided at the top of each moving head slide, and the locking groove is inserted on the guide rod through a trapezoidal pin.

7. A fast three-phase dual power supply transfer switch according to claim 2, characterized in that, A contact is provided between the moving contact substrate and the static contact substrate group. The static contact substrate group includes a static contact substrate. Silver dots are welded on both the static contact substrate and the moving contact substrate. A moving head slide is fixedly connected below the moving contact substrate, and the static contact substrate is installed on the lower case through mounting threaded holes.

8. A fast three-phase dual power supply transfer switch according to claim 1, characterized in that The input terminal and the moving contact substrate are connected by a flexible wire, and the static contact substrate and the output terminal are connected by a flexible wire. When the moving contact substrate and the static contact substrate are in contact, the switch is closed and powered on.

9. A fast three-phase dual-power conversion switch according to any one of claims 1-8, characterized in that, A control panel is provided on the upper case. A control panel isolation board for preventing interference of electrical components is installed behind the control panel. A power failure indicator light is provided on the control panel, and the power failure indicator light is connected to a micro switch. An information acquisition and control module is provided on the control circuit board, and the control circuit board is also connected to the control panel, current transformer, electromagnet motion group, micro switch, and large current detection transformer respectively.

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