Integrated dual-power-supply rapid switching device and integrated dual-power-supply rapid switching system

Abstract

The invention discloses an integrated dual-power-supply rapid switching device and system, and belongs to the technical field of power protection equipment. The device is characterized in that a first end of a rapid vacuum circuit breaker 2 is connected with a power supply system bus, and a second end of the rapid vacuum circuit breaker 2 is connected with a cable of an external network power supply; a current transformer group 3 is arranged at the second end of the quick vacuum circuit breaker 2, the second end of the quick vacuum circuit breaker 2 is connected with the first end of a high-voltage fuse 7, the second end of the high-voltage fuse 7 is connected with the first end of a voltage transformer 8, and the second end of the voltage transformer 8 is grounded; a zero sequence current transformer 9 is arranged at the cable inlet end of the external network power supply; the controller 1 is used for acquiring signals acquired by the current transformer group 3, the electrified sensor 4, the voltage transformer 8 and the zero sequence current transformer 9, and judging whether to send a control instruction to the quick vacuum circuit breaker 2 according to the acquired signals; the control instruction is used for controlling the opening or closing of the quick vacuum circuit breaker 2. And rapid power supply switching is realized through the switching device.

Description

Technical Field

[0001] The present invention relates to the technical field of power protection equipment, and in particular to an integrated dual-power supply fast switching device and system. Background Art

[0002] At present, a large amount of operating experience shows that when a short circuit fault, open circuit fault (tripping) or other faults occur in the enterprise's power supply system or the upper system, the voltage of the entire system will experience a "temporary voltage sag", which is likely to cause some voltage-sensitive production equipment to be forced to stop production. In severe cases, it may even cause equipment damage, leakage of toxic and hazardous materials and other production safety accidents.

[0003] When the upper power supply loses power or a short circuit occurs on the system power supply side, even if the protection operates normally, it will cause a voltage sag time of about 100ms. During the "voltage sag" period lasting about 100ms, some control devices such as AC contactors, solenoid valves, relays, etc. that control important production equipment will be released without pressure, and the voltage-sensitive equipment of the frequency converter will be shut down due to low voltage protection, which will cause accidents in which important production equipment will stop operating. The higher the voltage level of the fault branch, the greater the scope of impact. The "voltage sag" and "short interruption" caused by power supply side faults can cause accidents in which important sensitive equipment can stop operating. Based on this, the present invention proposes an integrated dual power supply fast switching device. Summary of the invention

[0004] The present invention provides an integrated dual-power supply fast switching device and system, which completes the switching action of bus power supply from external power supply 1 to external power supply 2 in a short time through the fast switching device, so that the bus voltage can be restored to normal power supply voltage in a short time, ensuring the continuous power supply of important sensitive loads in the intranet, and solving the technical problem of accidents of important sensitive equipment being shut down due to "voltage sag" and "short-term interruption" caused by power supply side faults.

[0005] According to one aspect of the present disclosure, an integrated dual power supply fast switching device is provided, the device comprising: Controller 1, fast vacuum circuit breaker 2, current transformer group 3, voltage transformer 8, zero-sequence current transformer 9; A first end of the fast vacuum circuit breaker 2 is connected to a power supply system bus, and a second end of the fast vacuum circuit breaker 2 is connected to a cable of an external power supply; A current transformer group 3 is arranged at the second end of the fast vacuum circuit breaker 2, the second end of the fast vacuum circuit breaker 2 is connected to the first end of the high-voltage fuse 7, the second end of the high-voltage fuse 7 is connected to the first end of the voltage transformer 8, and the second end of the voltage transformer 8 is grounded; A zero-sequence current transformer 9 is provided at the cable inlet end of the external power supply; The controller 1 is used to obtain signals collected by the current transformer group 3, the live sensor 4, the voltage transformer 8 and the zero-sequence current transformer 9, and determine whether to issue a control instruction to the fast vacuum circuit breaker 2 according to the collected signals; The control instruction is used to control the opening or closing of the fast vacuum circuit breaker 2 .

[0006] Figure 1 The connection relationship between the controller and the hardware it controls is not shown. The controller obtains the signals collected by the current transformer group 3, the live sensor 4, the voltage transformer 8 and the zero-sequence current transformer 9 through the communication line, and determines whether to issue a control instruction to the fast vacuum circuit breaker 2 based on the collected signals. This can be implemented by those skilled in the art based on their own knowledge.

[0007] In a possible implementation, the current transformer group 3 includes a first current transformer, a second current transformer and a third current transformer arranged on phase A of the external power supply, a fourth current transformer, a fifth current transformer and a sixth current transformer arranged on phase B of the external power supply, and a seventh current transformer, an eighth current transformer and a ninth current transformer arranged on phase C of the external power supply; Among them, the first current transformer, the fourth current transformer and the seventh current transformer are used by the controller 1 to collect the three-phase current signals of the external power supply; the second current transformer, the fifth current transformer and the eighth current transformer are used by the command control center to collect the three-phase current signals of the external power supply; the third current transformer, the sixth current transformer and the ninth current transformer are backup current transformers.

[0008] In a possible implementation, the controller 1 is used to collect three-phase current signals of the external power supply through the first current transformer, the fourth current transformer and the seventh current transformer; The controller 1 is used to obtain the voltage signal of the external power supply through the voltage transformer 8, and determine the fault condition according to the voltage signal. The fault condition includes: resonance, overvoltage, overvoltage, loss of voltage, undervoltage, and three-phase imbalance.

[0009] In a possible implementation, the device further includes: a charged sensor 4, a charged display 5, an overvoltage protector 6, and a high-voltage fuse 7; The second end of the fast vacuum circuit breaker 2 is connected to the first end of the charged sensor 4; The second end of the charge sensor 4 is connected to the first end of the charge indicator 5, and the second end of the charge indicator 5 is grounded; The second end of the fast vacuum circuit breaker 2 is connected to the first end of the overvoltage protector 6, and the second end of the overvoltage protector 6 is grounded; The live sensor 4 is used to detect whether the tested line carries high voltage, the live display 5 is used to display the detection result of the live sensor 4, the overvoltage protector 6 is used to power off the power system when the external network power supply voltage is greater than the preset voltage value, and the high-voltage fuse 7 is used to automatically disconnect when the current of the tested line is greater than the preset current value.

[0010] In a possible implementation, the fast vacuum circuit breaker 2 includes: Intelligent energy storage controller, position sensor, fast bistable magnetic repulsion mechanism, mechanism center axis, transmission arm, insulating pull rod, vacuum interrupter; The fast bistable magnetic repulsion mechanism includes: a fast bistable holding mechanism, a closing energy storage capacitor, an opening energy storage capacitor, a charging power supply, a closing coil, an opening coil, a control switch, and an eddy current disk; Wherein, the first end of the charging power supply is connected to the second end of the control switch; The first end of the charging power supply is connected to the second end of the closing energy storage capacitor, and the first end of the charging power supply is connected to the first end of the opening energy storage capacitor; A first end of the closing energy storage capacitor and a second end of the opening energy storage capacitor are connected to a second end of the charging power supply; The first end of the closing energy storage capacitor is connected to the closing coil, and the second end of the opening energy storage capacitor is connected to the opening coil; The eddy current disk is arranged between the closing coil and the opening coil, the central axis of the eddy current disk is connected to the first end of the transmission arm, the second end of the transmission arm is connected to the lower end of the insulating pull rod, and the upper end of the insulating pull rod is connected to the vacuum interrupter, so that the moving contact and the static contact of the vacuum interrupter are in contact or separated; When the moving contact and the stationary contact in the vacuum interrupter are energized and opened under the action of the fast bistable magnetic repulsion mechanism, a vacuum arc will be generated between the moving contact and the stationary contact. The arc burns on the contact surface, and the residual ions, electrons and metal vapor can be compounded or condensed on the contact surface and the shielding cover within microseconds, and the arc is extinguished to achieve opening. Position sensors are used to detect the position of the circuit breaker in closing or opening; Figure 2 As shown, the position sensor can be arranged on the transmission arm.

[0011] The intelligent energy storage controller is used to obtain data collected by the position sensor and control the charging and discharging of the closing energy storage capacitor and the opening energy storage capacitor.

[0012] In a possible implementation, the working principle of the circuit breaker includes: The fast bistable eddy current repulsion mechanism discharges to the closing coil through the pre-charged closing capacitor, or discharges to the opening or closing coil through the opening capacitor. The closing coil or opening coil generates a pulse current. Under the action of the pulse current, eddy currents are induced in the eddy current disk and electromagnetic repulsion is generated. The eddy current disk drives the central axis of the mechanism, and drives the insulating pull rod connected to the vacuum interrupter through the transmission arm to move, thereby realizing the opening or closing of the circuit breaker. The circuit breaker provides the contact pressure required for closing and the opening holding force required after opening through a bistable permanent magnetic holding mechanism.

[0013] According to another aspect of the present disclosure, an integrated dual power supply fast switching system is provided, the system comprising the integrated dual power supply fast switching device, the system comprising: A first fast switching device and a second fast switching device, wherein the first end of the first fast switching device is connected to the first external power supply, and the second end of the first fast switching device is connected to the power system bus, the first end of the second fast switching device is connected to the second external power supply, and the second end of the second fast switching device is connected to the power system bus; the first fast switching device and the second fast switching device are controlled by a controller together; The power system busbar is used to connect motors, frequency converters or non-sensitive equipment, where non-sensitive equipment includes fans and belt conveyors; The working principle of the system includes: During normal operation, the first fast switching device is closed and the second fast switching device is open for hot standby; When the bus voltage temporarily drops due to a short circuit fault in the first external power supply, the controller identifies the type of fault causing the voltage sag based on the voltage signal and current signal collected in the first fast switching device, and issues an opening command for the first fast switching device and a closing command for the second fast switching device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The integrated dual-power fast switching device of the disclosed embodiment is in normal operation, with the first fast switching device closed and the second fast switching device opened for hot standby; when the first external power supply causes a bus voltage sag due to a short circuit fault, the controller identifies the fault type causing the voltage sag within 5ms, and issues an opening command for the first fast switching device and a closing command for the second fast switching device. The bus power supply is switched from external power supply 1 to external power supply 2 within 15-30ms, so that the bus voltage returns to normal power supply voltage within 30ms, ensuring continuous power supply to important sensitive loads in the intranet; BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A principle block diagram of an integrated dual-power fast switching device according to an embodiment of the present disclosure is shown.

[0016] Figure 2 A functional block diagram of a circuit breaker according to an embodiment of the present disclosure is shown.

[0017] Figure 3 A block diagram of an integrated dual-power fast switching system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0018] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0019] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0020] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0021] Figure 1 A schematic diagram of an integrated dual power supply fast switching device according to an embodiment of the present disclosure is shown. Figure 1 As shown, the device comprises: According to one aspect of the present disclosure, an integrated dual power supply fast switching device is provided, the device comprising: Controller 1, fast vacuum circuit breaker 2, current transformer group 3, voltage transformer 8, zero-sequence current transformer 9; A first end of the fast vacuum circuit breaker 2 is connected to a power supply system bus, and a second end of the fast vacuum circuit breaker 2 is connected to a cable of an external power supply; A current transformer group 3 is arranged at the second end of the fast vacuum circuit breaker 2, the second end of the fast vacuum circuit breaker 2 is connected to the first end of the high-voltage fuse 7, the second end of the high-voltage fuse 7 is connected to the first end of the voltage transformer 8, and the second end of the voltage transformer 8 is grounded; A zero-sequence current transformer 9 is provided at the cable inlet end of the external power supply; The controller 1 is used to obtain signals collected by the current transformer group 3, the live sensor 4, the voltage transformer 8 and the zero-sequence current transformer 9, and determine whether to issue a control instruction to the fast vacuum circuit breaker 2 according to the collected signals; The control instruction is used to control the opening or closing of the fast vacuum circuit breaker 2 .

[0022] In a possible implementation, the current transformer group 3 includes a first current transformer, a second current transformer and a third current transformer arranged on phase A of the external power supply, a fourth current transformer, a fifth current transformer and a sixth current transformer arranged on phase B of the external power supply, and a seventh current transformer, an eighth current transformer and a ninth current transformer arranged on phase C of the external power supply; Among them, the first current transformer, the fourth current transformer and the seventh current transformer are used by the controller 1 to collect the three-phase current signals of the external power supply; the second current transformer, the fifth current transformer and the eighth current transformer are used by the command control center to collect the three-phase current signals of the external power supply; the third current transformer, the sixth current transformer and the ninth current transformer are backup current transformers.

[0023] In a possible implementation, the controller 1 is used to collect three-phase current signals of the external power supply through the first current transformer, the fourth current transformer and the seventh current transformer; The controller 1 is used to obtain the voltage signal of the external power supply through the voltage transformer 8, and determine the fault condition according to the voltage signal. The fault condition includes: resonance, overvoltage, overvoltage, loss of voltage, undervoltage, and three-phase imbalance.

[0024] In a possible implementation, the device further includes: a charged sensor 4, a charged display 5, an overvoltage protector 6, and a high-voltage fuse 7; The second end of the fast vacuum circuit breaker 2 is connected to the first end of the charged sensor 4; The second end of the charge sensor 4 is connected to the first end of the charge indicator 5, and the second end of the charge indicator 5 is grounded; The second end of the fast vacuum circuit breaker 2 is connected to the first end of the overvoltage protector 6, and the second end of the overvoltage protector 6 is grounded; The live sensor 4 is used to detect whether the tested line carries high voltage, the live display 5 is used to display the detection result of the live sensor 4, the overvoltage protector 6 is used to power off the power system when the external network power supply voltage is greater than the preset voltage value, and the high-voltage fuse 7 is used to automatically disconnect when the current of the tested line is greater than the preset current value.

[0025] Figure 2 The principle block diagram of a circuit breaker according to an embodiment of the present disclosure is shown. In a possible implementation, the fast vacuum circuit breaker 2 includes: Intelligent energy storage controller, position sensor, fast bistable magnetic repulsion mechanism, mechanism center axis, transmission arm, insulating pull rod, vacuum interrupter; The fast bistable magnetic repulsion mechanism includes: a fast bistable holding mechanism, a closing energy storage capacitor, an opening energy storage capacitor, a charging power supply, a closing coil, an opening coil, a control switch, and an eddy current disk; Wherein, the first end of the charging power supply is connected to the second end of the control switch; The first end of the charging power supply is connected to the second end of the closing energy storage capacitor, and the first end of the charging power supply is connected to the first end of the opening energy storage capacitor; A first end of the closing energy storage capacitor and a second end of the opening energy storage capacitor are connected to a second end of the charging power supply; The first end of the closing energy storage capacitor is connected to the closing coil, and the second end of the opening energy storage capacitor is connected to the opening coil; The eddy current disk is arranged between the closing coil and the opening coil, the central axis of the eddy current disk is connected to the first end of the transmission arm, the second end of the transmission arm is connected to the lower end of the insulating pull rod, and the upper end of the insulating pull rod is connected to the vacuum interrupter, so that the moving contact and the static contact of the vacuum interrupter are in contact or separated; When the moving contact and the stationary contact in the vacuum interrupter are energized and opened under the action of the fast bistable magnetic repulsion mechanism, a vacuum arc will be generated between the moving contact and the stationary contact. The arc burns on the contact surface, and the residual ions, electrons and metal vapor can be compounded or condensed on the contact surface and the shielding cover within microseconds, and the arc is extinguished to achieve opening. The position sensor is used to detect the position of the circuit breaker in closing or opening; The intelligent energy storage controller is used to obtain data collected by the position sensor and control the charging and discharging of the closing energy storage capacitor and the opening energy storage capacitor.

[0026] In terms of distance, the control panel of the circuit breaker is provided with a closing button, an opening button, and a display screen, and the display screen is used to display the energy storage capacity of the energy storage capacitor, etc.

[0027] In a possible implementation, the working principle of the circuit breaker includes: The fast bistable eddy current repulsion mechanism discharges to the closing coil through the pre-charged closing capacitor, or discharges to the opening or closing coil through the opening capacitor. The closing coil or opening coil generates a pulse current. Under the action of the pulse current, eddy currents are induced in the eddy current disk and electromagnetic repulsion is generated. The eddy current disk drives the central axis of the mechanism, and drives the insulating pull rod connected to the vacuum interrupter through the transmission arm to move, thereby realizing the opening or closing of the circuit breaker. It uses eddy current electromagnetic drive and permanent magnet opening and closing holding mechanism, and can achieve steady-state maintenance of the closing and opening terminal positions without mechanical tripping or locking devices. It has less than 10 moving parts and can complete high-speed closing and opening of the contacts as well as closing and opening position retention. The failure rate is extremely low, and it is maintenance-free or low-maintenance.

[0028] When the circuit breaker is closed, a certain contact pressure needs to be maintained between the moving and static contacts of the circuit breaker. After disconnection, a certain opening distance needs to be maintained between the moving and static contacts of the circuit breaker.

[0029] The circuit breaker provides the contact pressure required for closing and the opening holding force required after opening through a bistable permanent magnetic holding mechanism.

[0030] Table 1 Circuit breaker opening time and closing time test results: ; From Table 1, it can be seen that the opening time of the circuit breaker is within 5 milliseconds and the closing time is within 12 milliseconds, both of which meet the technical requirements. The rated voltage of the circuit breaker in the table can be 220V DC voltage.

[0031] During the closing operation, whether the "closing" button is pressed manually or operated remotely, the intelligent energy storage controller will issue a closing command, drive the closing capacitor to discharge quickly, drive the eddy current disk and the main shaft transmission arm to drive the insulating pull rod and the moving contact into the closing position, and compress the contact spring to maintain the required contact pressure of the contact.

[0032] After the closing action is completed, the closing holding magnet of the bistable permanent magnet holding mechanism holds the circuit breaker in the closed position, and the energy storage indicator light goes out. The intelligent energy storage controller controls the charging of the closing capacitor until the closing capacitor is charged to the working voltage. At the same time as the closing action, the position sensor gives a closing contact signal. When the circuit breaker reaches the closed position, the intelligent energy storage controller automatically and quickly cuts off the current on the mechanism coil according to the signal of the position sensor.

[0033] You can press the "open" button, or issue an opening command through the intelligent energy storage controller to drive the opening capacitor to discharge quickly. The energy stored in the contact spring and the opening capacitor drives the eddy current disk and the main shaft transmission arm, driving the insulating pull rod to separate the moving and static contacts of the arc extinguishing chamber.

[0034] After the opening action is completed, the opening holding magnet of the bistable permanent magnet holding mechanism holds the circuit breaker in the opening position, and the intelligent energy storage controller controls the opening capacitor to enter the energy storage state until the opening capacitor is charged to the working voltage. The position sensor gives an opening contact signal. When the circuit breaker reaches the opening position, the intelligent energy storage controller automatically and quickly cuts off the current on the mechanism coil according to the signal of the position sensor.

[0035] Among them, the structures of the moving contact, static contact and spring of the vacuum arc extinguishing chamber are well known in the art and will not be elaborated in this application.

[0036] Figure 3 A block diagram of an integrated dual power supply fast switching system according to an embodiment of the present disclosure is shown. According to another aspect of the present disclosure, the system includes an integrated dual power supply fast switching device, such as Figure 3 As shown in the red frame line in FIG, the system includes: a first fast switching device, a second fast switching device, The first end of the first fast switching device is connected to the first external power supply, the second end of the first fast switching device is connected to the power system bus, the first end of the second fast switching device is connected to the second external power supply, and the second end of the second fast switching device is connected to the power system bus; Figure 3 The controller in Figure 1 In the controller 1, in the system, the first fast switching device and the second fast switching device are controlled by the controller together; for example, the controller 1 is arranged in the first fast switching device, and the controller 1 is not arranged in the second fast switching device, and the first fast switching device and the second fast switching device are controlled by the controller 1, or the controller 1 is arranged in the second fast switching device, and the controller 1 is not arranged in the second fast switching device, and the first fast switching device and the second fast switching device are controlled by the controller 1.

[0037] The power system bus is connected to the motor M, the inverter BPQ or non-sensitive equipment, where the non-sensitive equipment includes: fans, belt conveyors; The controller obtains the voltage signal of the external power supply 1 (T1) through the first voltage transformer PT1, obtains the voltage signal of the external power supply 2 (T2) through the second voltage transformer PT2, obtains the current signal of the external power supply 1 through the first current transformer LK1, and obtains the current signal of the external power supply 2 through the second current transformer LK2.

[0038] Among them, the first voltage transformer PT1 is the voltage transformer 8 in the fast switch 1, and the second voltage transformer PT2 is the voltage transformer 8 in the fast switch 2; the first current transformer LK1 is the current transformer group 3 in the fast switch 1, and the second current transformer LK1 is the current transformer group 3 in the fast switch 2.

[0039] The working principle of the system includes: During normal operation, the first fast switching device is closed (fast switch 1) and the second fast switching device (fast switch 2) is open for hot standby; When the bus voltage temporarily drops due to a short circuit fault in the first external power supply, the controller identifies the type of fault causing the voltage sag based on the voltage signal and current signal collected in the first fast switching device, and issues an opening command for the first fast switching device and a closing command for the second fast switching device.

[0040] The voltage sag time is equal to the protection outlet time plus the main switch disconnection time and the standby switch closing time. The voltage sag time in the prior art is greater than the tolerance limit of sensitive equipment, resulting in equipment shutdown. Among them, sensitive equipment can be CT scanning equipment, MRI equipment, or communication equipment at an airport.

[0041] The overall switching time (voltage sag time) of the integrated dual-power fast switching system of the disclosed embodiment is less than the tolerance limit time of sensitive equipment, the sensitive equipment operates continuously without disturbance, and the voltage sag does not cause production stoppage accidents.

[0042] For example, when the incoming line switch trips and loses power, the main power switch is opened and the backup switch is closed, and the bus voltage is restored within 20ms through rapid switching of the power supply. When a short circuit occurs in the external network, the main power switch is opened and the backup switch is closed, and the bus voltage is restored within 30ms through rapid switching of the power supply.

[0043] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An integrated dual power supply fast switching device, characterized in that: The device comprises: Controller (1), fast vacuum circuit breaker (2), current transformer group (3), voltage transformer (8), zero-sequence current transformer (9); A first end of the fast vacuum circuit breaker (2) is connected to a power supply system busbar, and a second end of the fast vacuum circuit breaker (2) is connected to a cable of an external power supply; A current transformer group (3) is arranged at the second end of the fast vacuum circuit breaker (2), the second end of the fast vacuum circuit breaker (2) is connected to the first end of the high-voltage fuse (7), the second end of the high-voltage fuse (7) is connected to the first end of the voltage transformer (8), and the second end of the voltage transformer (8) is grounded; A zero-sequence current transformer (9) is provided at the cable inlet end of the external power supply; The controller (1) is used to obtain signals collected by the current transformer group (3), the live sensor (4), the voltage transformer (8) and the zero-sequence current transformer (9), and to determine whether to issue a control instruction to the fast vacuum circuit breaker (2) based on the collected signals; The control instruction is used to control the opening or closing of the fast vacuum circuit breaker (2).

2. The integrated dual power supply fast switching device according to claim 1, characterized in that: The current transformer group (3) comprises a first current transformer, a second current transformer and a third current transformer arranged on phase A of the external power supply, a fourth current transformer, a fifth current transformer and a sixth current transformer arranged on phase B of the external power supply, and a seventh current transformer, an eighth current transformer and a ninth current transformer arranged on phase C of the external power supply; The first current transformer, the fourth current transformer and the seventh current transformer are used by the controller (1) to collect three-phase current signals of the external power supply; the second current transformer, the fifth current transformer and the eighth current transformer are used by the command control center to collect three-phase current signals of the external power supply; the third current transformer, the sixth current transformer and the ninth current transformer are standby current transformers.

3. The integrated dual power supply fast switching device according to claim 2, characterized in that: The controller (1) is used to collect three-phase current signals of an external power supply through a first current transformer, a fourth current transformer and a seventh current transformer; The controller (1) is used to obtain a voltage signal of an external power supply through a voltage transformer (8), and to determine a fault condition based on the voltage signal. The fault condition includes: resonance, overvoltage, overvoltage, loss of voltage, undervoltage, and three-phase imbalance.

4. The integrated dual power supply fast switching device according to claim 2, characterized in that: The device further comprises: a charged sensor (4), a charged display (5), an overvoltage protector (6), and a high-voltage fuse (7); The second end of the fast vacuum circuit breaker (2) is connected to the first end of the charged sensor (4); The second end of the charge sensor (4) is connected to the first end of the charge indicator (5), and the second end of the charge indicator (5) is grounded; The second end of the fast vacuum circuit breaker (2) is connected to the first end of the overvoltage protector (6), and the second end of the overvoltage protector (6) is grounded; The live sensor (4) is used to detect whether the tested line carries high voltage, the live display (5) is used to display the detection result of the live sensor (4), the overvoltage protector (6) is used to cut off the power supply to the power system when the voltage of the external network power supply is greater than the preset voltage value, and the high-voltage fuse (7) is used to automatically disconnect when the current of the tested line is greater than the preset current value.

5. The integrated dual power supply fast switching device according to claim 2, characterized in that: The fast vacuum circuit breaker (2) comprises: Intelligent energy storage controller, position sensor, fast bistable magnetic repulsion mechanism, mechanism center axis, transmission arm, insulating pull rod, vacuum interrupter; The fast bistable magnetic repulsion mechanism includes: a fast bistable holding mechanism, a closing energy storage capacitor, an opening energy storage capacitor, a charging power supply, a closing coil, an opening coil, a control switch, and an eddy current disk; Wherein, the first end of the charging power supply is connected to the second end of the control switch; The first end of the charging power supply is connected to the second end of the closing energy storage capacitor, and the first end of the charging power supply is connected to the first end of the opening energy storage capacitor; A first end of the closing energy storage capacitor and a second end of the opening energy storage capacitor are connected to a second end of the charging power supply; The first end of the closing energy storage capacitor is connected to the closing coil, and the second end of the opening energy storage capacitor is connected to the opening coil; The eddy current disk is arranged between the closing coil and the opening coil, the central axis of the eddy current disk is connected to the first end of the transmission arm, the second end of the transmission arm is connected to the lower end of the insulating pull rod, and the upper end of the insulating pull rod is connected to the vacuum interrupter, so that the moving contact and the static contact of the vacuum interrupter are in contact or separated; When the moving contact and the stationary contact in the vacuum interrupter are energized and opened under the action of the fast bistable magnetic repulsion mechanism, a vacuum arc will be generated between the moving contact and the stationary contact. The arc burns on the contact surface, and the residual ions, electrons and metal vapor can be compounded or condensed on the contact surface and the shielding cover within microseconds, and the arc is extinguished to achieve opening. The position sensor is used to detect the position of the circuit breaker in closing or opening; The intelligent energy storage controller is used to obtain data collected by the position sensor and control the charging and discharging of the closing energy storage capacitor and the opening energy storage capacitor.

6. The integrated dual power supply fast switching device according to claim 5, characterized in that: The working principle of the circuit breaker includes: The fast bistable eddy current repulsion mechanism discharges to the closing coil through the pre-charged closing capacitor, or discharges to the opening or closing coil through the opening capacitor. The closing coil or opening coil generates a pulse current. Under the action of the pulse current, eddy currents are induced in the eddy current disk and electromagnetic repulsion is generated. The eddy current disk drives the central axis of the mechanism, and drives the insulating pull rod connected to the vacuum interrupter through the transmission arm to move, thereby realizing the opening or closing of the circuit breaker. The circuit breaker provides the contact pressure required for closing and the opening holding force required after opening through a bistable permanent magnetic holding mechanism.

7. An integrated dual power supply fast switching system, characterized in that: The system comprises the integrated dual power supply fast switching device according to any one of claims 1 to 4, and the system comprises: A first fast switching device and a second fast switching device, wherein the first end of the first fast switching device is connected to the first external power supply, and the second end of the first fast switching device is connected to the power system bus, the first end of the second fast switching device is connected to the second external power supply, and the second end of the second fast switching device is connected to the power system bus; the first fast switching device and the second fast switching device are controlled by a controller together; The power system busbar is used to connect motors, frequency converters or non-sensitive equipment, where non-sensitive equipment includes fans and belt conveyors; The working principle of the system includes: During normal operation, the first fast switching device is closed and the second fast switching device is open for hot standby; When the bus voltage temporarily drops due to a short circuit fault in the first external power supply, the controller identifies the type of fault causing the voltage drop based on the voltage signal and current signal collected in the first fast switching device, and issues an opening command for the first fast switching device and a closing command for the second fast switching device.

Images