CN107896102B - A hybrid switch with a main channel series solid-state switch - Google Patents

Abstract

The invention provides a hybrid switch circuit with a main channel connected with a solid-state switch in series, a change-over switch, a switching protection system and a control method thereof, wherein the hybrid switch circuit comprises a mechanical switch branch, a main solid-state switch branch and an energy absorption branch, and the main solid-state switch branch comprises one or more solid-state switches connected in series; the mechanical switch branch comprises a mechanical switch and a solid-state switch; the solid state switch comprises a power electronic switch/diode anti-parallel circuit and a capacitor, and the power electronic switch/diode anti-parallel circuit is connected with the capacitor in parallel. The hybrid switch circuit, the change-over switch, the switching protection system and the control method thereof have the characteristics of convenience in control, capability of fast switching, simple structure and reliable performance.

Description

A hybrid switch with a main channel series solid-state switch

technical field

The invention relates to the technical field of power electronics, in particular to a hybrid switch circuit and a switch device based on a main channel series-connected solid-state switch.

Background technique

There is currently an automatic charging type forced zero-crossing high voltage DC circuit breaker (see patent CN105186443A), which uses a fast switching unit, an energy absorption unit, a coupling reactor unit, a commutation capacitor unit and a main circuit isolation switch unit. As shown in the specific circuit diagram of the automatic charging type forced zero-crossing high-voltage DC circuit breaker as shown in Figure 1, the first isolation switch K1 is connected in series with the fast switch CB, the primary winding L1, and the second isolation switch K2 in sequence, and the energy absorption unit MOV is connected with the fast switch. CBs are connected in parallel, the charging switch K3 is connected in series with the commutation capacitor C and the secondary winding L2 in turn, and one end is connected to the input end of the fast switch CB, and the other end is connected to the output end of the fast switch CB.

This automatic charging type forced zero-crossing high-voltage DC circuit breaker has the advantages of small size of pre-charging equipment, low requirement on the triggering switching speed of the commutation branch, simple control, and can interrupt the fault current in any direction. However, there are low circuit reliability, and it is not conducive to opening/closing control, and the switch is slow.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a reliable and high-stability hybrid switch circuit, a switch device, and a power supply switching protection system with a main channel series solid-state switch.

The present invention provides a hybrid switch circuit in which the main path is connected in series with solid-state switches, which is characterized in that:

The hybrid switch circuit includes a mechanical switch branch, a main solid-state switch branch, and an energy absorption branch, wherein,

The main solid-state switch branch includes one or more series-connected solid-state switches;

Mechanical switch branches include mechanical switches and solid state switches;

The solid state switch includes a power electronic switch/diode anti-parallel circuit and a capacitor, the power electronic switch/diode anti-parallel circuit being in parallel with the capacitor.

Further, the mechanical switch branch, the main solid state switch branch, and the energy absorption branch are connected in parallel.

Further, the power electronic switch includes but is not limited to thyristor, IGBT or IGCT.

Further, the energy absorption branch includes a lightning arrester.

The present invention also provides a switch circuit control method, which is applied to the hybrid switch circuit in which the main channel is connected in series with solid-state switches as described above, and is characterized in that:

Control the main solid state switch branch to be turned on, and the solid state switch in the mechanical switch branch to be disconnected;

The mechanical switches in the branch of the control mechanical switch are disconnected, and the branch of the main solid state switch is controlled to be disconnected.

Further, when the contact gap of the mechanical switch in the mechanical switch branch can withstand the transient recovery voltage, the main solid-state switch branch is controlled to be disconnected.

The present invention provides a switch circuit control method, which is applied to the hybrid switch circuit in which the main channel is connected in series with solid-state switches as described above, and is characterized in that:

controlling the main solid state switch branch to be turned on;

controlling the mechanical switch of the mechanical switch branch to be closed, and controlling the solid state switch of the mechanical switch branch to be turned on;

The main solid state switch branch is controlled to be disconnected.

The present invention also provides an automatic switch device, characterized in that the automatic switch device includes a main switch component and a standby switch component, wherein,

The main switch component includes three hybrid switch circuits with solid-state switches connected in series in the main channel as described above, which are respectively used in the A-phase, B-phase, and C-phase branches of the three-phase electricity;

The standby switch component includes three hybrid switch circuits with solid-state switches connected in series in the main channel as described above, which are respectively used in the A-phase, B-phase, and C-phase branches of the three-phase electricity.

The present invention also provides a power switching protection system, which is characterized in that:

The power protection switching system includes:

Working power and backup power;

The above automatic transfer switch device, wherein the main transfer switch component in the automatic transfer switch device is connected to the working power supply, and the backup switch component is connected to the standby power supply;

A monitoring system for monitoring the working state of the working power source and/or the backup power source;

Control protection system, control the main switch component and/or standby switch component in the automatic transfer switch device to open according to the switch circuit control method described above, and/or control according to the switch circuit control method described above In the automatic transfer switch device, the main transfer switch component and/or the standby transfer switch component are closed.

Further, the monitoring system is further configured to send the information of the working state to the control and protection system, and the control and protection system controls the automatic transfer switch device in the main transfer switch component and the backup switch according to the information. Toggle switch between components.

Further, the monitoring system also detects the closing and opening states of the automatic transfer switch, and feeds back the information of the states to the control and protection system.

The hybrid switch circuit, the switch device and the power switching protection system of the main channel series solid state switch of the present invention have the characteristics of convenient control, fast switching, simple structure and reliable performance.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Figure 1 shows a schematic structural diagram of an automatic charging type forced zero-crossing high-voltage DC circuit breaker in the prior art;

FIG. 2 shows a schematic structural diagram of a hybrid switch circuit of a main channel series solid-state switch according to an embodiment of the present invention;

FIG. 3 shows a schematic structural diagram of a hybrid automatic switching device of a main channel series solid-state switch according to an embodiment of the present invention;

FIG. 4 shows a schematic structural diagram of a dual power supply redundant power supply system according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The switch of the present invention adopts a hybrid switch circuit in which the main channel is connected in series with solid-state switches. The embodiments of the present invention take a switch circuit as an example for illustrative description, but those skilled in the art should realize that, without departing from the basic inventive concept of the present invention, all devices such as a switch, circuit breaker, etc., which can realize circuit on-off Switching circuits, elements, components, equipment, systems, etc. can all implement the present invention, and these all fall within the protection scope of the present invention.

As shown in FIG. 2 , the hybrid switch circuit includes a mechanical switch branch, a main solid-state switch branch, and an energy absorption branch connected in parallel, wherein the main solid-state switch branch includes a solid-state switch as the main solid-state switch, so The solid-state switch has one or more series connections. In Figure 2, the branch where the main solid-state switch is located is broken to indicate that there can be one solid-state switch or multiple solid-state switches in series, but it does not mean that the branch where the solid-state switch is located is electrical. disconnected; the mechanical switch branch includes a mechanical switch and a solid state switch as an auxiliary solid state switch; the solid state switch includes a power electronic switch/diode antiparallel circuit and a capacitor, the power electronic switch/diode antiparallel circuit and the capacitor in parallel.

In the embodiment, a thyristor is used as an example for description, but it is not limited to a thyristor, but any power electronic switch can be applied to the present invention. The power electronic switch can be selected from thyristor, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), IGCT (integrated Gate Commutated Thyristors, integrated gate commutated thyristor) or GTO (Gate-Turn-Off Thyristor, the gate can be Turn off any one or more of thyristors), etc. The on-off of the solid-state switch can be realized by controlling the on-off of the above-mentioned power electronic switch.

The main solid-state switch includes a plurality of controllable thyristor/diode anti-parallel circuits. For the sake of clarity, as an example, in the embodiment, the first controllable thyristor/diode anti-parallel circuit and the second controllable thyristor/diode anti-parallel circuit are used. The circuit, the third controllable thyristor/diode anti-parallel circuit, and the fourth controllable thyristor/diode anti-parallel circuit are distinguished. The first controllable thyristor/diode anti-parallel circuit is connected in series with the second controllable thyristor/diode anti-parallel circuit to form a first series circuit, the third controllable thyristor/diode anti-parallel circuit and the fourth controllable thyristor/diode anti-parallel circuit The series connection forms a second series circuit, and both the first series circuit and the second series circuit are connected in parallel with a capacitor.

The present invention is not limited to the above-mentioned four circuits of the first to fourth controllable thyristor/diode anti-parallel circuits.

It may also include a first controllable thyristor/diode anti-parallel circuit, a third controllable thyristor/diode anti-parallel circuit, and the capacitor, and the first controllable thyristor/diode anti-parallel circuit, the third controllable thyristor/diode anti-parallel circuit, and the third controllable thyristor/diode anti-parallel circuit A parallel circuit and the capacitor are connected in parallel to form the main solid state switch. Further, a plurality of parallel controllable thyristor/diode anti-parallel circuits may be connected in parallel with the capacitor to form the main solid-state switch.

It may also include a first controllable thyristor/diode anti-parallel circuit, a second controllable thyristor/diode anti-parallel circuit and the capacitor, and the first controllable thyristor/diode anti-parallel circuit and the second A controllable thyristor/diode anti-parallel circuit is connected in series to form a first series circuit, and the first series circuit and the capacitor are connected in parallel to form the main solid state switch.

It may also include a first controllable thyristor/diode anti-parallel circuit, a second controllable thyristor/diode anti-parallel circuit, a third controllable thyristor/diode anti-parallel circuit, and the capacitor, and the first controllable thyristor/diode anti-parallel circuit The diode anti-parallel circuit is connected in series with the second controllable thyristor/diode anti-parallel circuit to form a first series circuit, and the first series circuit, the third controllable thyristor/diode anti-parallel circuit and the capacitor are connected in parallel to form the main circuit. solid state switch.

Further, any of the above-mentioned first series circuit and/or second series circuit may include three or more series-connected controllable thyristor/diode anti-parallel circuits.

The energy absorption branch mainly includes a surge arrester. In the embodiment, a MOV (metal oxide varistor) zinc oxide surge arrester is used, and the lightning protection absorption system absorbs the residual energy generated during the opening and closing process of the mechanical switch, thereby realizing Overvoltage protection for mechanical switches. The present invention uses the MOV zinc oxide arrester as an exemplary lightning protection absorption system, but is not limited to using the MOV zinc oxide arrester as the lightning protection absorption system. All energy absorption circuits or systems that can absorb the remaining energy in the branch can be used in the present invention.

When the switch circuit operates normally to establish the connection between the power supply and the load, the mechanical switch in the mechanical switch branch is closed, and the solid-state switch serving as the auxiliary solid-state switch in the mechanical switch branch is turned on; so The solid-state switch in the main solid-state switch branch is disconnected, and in this state, current flows through the mechanical switch branch to supply power to the load.

The opening control process of the hybrid switch circuit based on the coupled negative voltage circuit described in the embodiment is as follows: controlling the solid state switch in the main solid state switch branch to be turned on, and disconnecting the solid state switch in the mechanical switch branch, thereby The forced current is transferred from the mechanical switch branch to the main solid-state switch branch; when the current transfer is completed, the mechanical switch that controls the mechanical switch branch is turned off, the mechanical switch zero-crosses the arc and extinguishes the arc. When the opening moves to the point where the contact gap can withstand the corresponding transient recovery voltage, the solid-state switch in the main solid-state switch branch is controlled to be turned off. At this time, the line energy is absorbed by the MOV, and the main switch current drops to zero.

The closing control process of the hybrid switch circuit in which the main path is connected in series with the solid-state switch according to the embodiment is as follows: controlling the solid-state switch in the main solid-state switch branch to conduct, and controlling the mechanical switch in the mechanical switch branch to close. , controlling the solid state switch in the mechanical switch branch to be turned on.

The embodiment also provides a switch component, which adopts the above-mentioned hybrid switch circuit in which the main channel is connected in series with the solid-state switch. The switch component is used in a three-phase alternating current system, and the circuit of each phase adopts the above-mentioned hybrid switch circuit based on the coupled negative voltage circuit. As shown in FIG. 3 , the switch components use the above-mentioned hybrid switch circuit of the main channel series solid-state switch in the A-phase, B-phase, and C-phase respectively: the A-phase, B-phase, C-phase ( In the figure, in order to distinguish it from the three-phase line of the standby switch, A1, B1, and C1 represent the A-phase, B-phase, and C-phase lines) all adopt the above-mentioned hybrid switch circuit of the main channel series solid-state switch; in the standby switch component The A-phase, B-phase and C-phase (in the figure, in order to distinguish it from the three-phase line of the main switch, A2, B2, and C2 represent the A-phase, B-phase, and C-phase lines) also use the above-mentioned main path series solid-state switch. hybrid switching circuit.

As shown in FIG. 3 , the embodiment further provides an automatic transfer switch device, the automatic transfer switch device includes two above-mentioned switch components, one of which is a main switch component and the other is a backup switch component. During normal operation, the main switch part is turned on, so that the power supply provides current to the load through the main switch part; the backup switch part is disconnected. When a fault occurs and the power supply needs to be switched from the main switch part to the backup switch part, the main switch part is disconnected through the above-mentioned opening control process, and the standby switch part is turned on through the above-mentioned closing control process.

In this embodiment, a dual power supply redundant power supply system is used to illustrate the control and use of the above-mentioned hybrid switch device of the main channel series solid state switch. However, it should be clear that the hybrid automatic transfer switch device of the main channel series solid-state switch in the above embodiment is not limited to a dual power supply redundant power supply system, a multi power supply redundant power supply system, and a general power supply system such as a single power supply system that can use switches The electric power system etc. can use the hybrid automatic transfer switch device in which the main channel is connected in series with the solid-state switch described in the above embodiments.

FIG. 4 is a schematic structural diagram of a dual power supply redundant power supply system according to an embodiment of the present invention. The dual power supply system includes a power supply, a control and protection system, an automatic switching switch device, a load, and a monitoring system composed of monitoring components such as sensors, wherein the power supply includes two sets of power supplies, a working power supply and a backup power supply, and the automatic switching switch device is composed of two sets of power supplies. The main switch part is connected with the working power supply, and the backup switch part is connected with the backup power supply. In the dual power supply redundant power supply system, the main switch component on the working power supply branch and/or the standby switch component on the standby power supply branch can use the hybrid automatic switch of the main channel series solid state switch described in the above embodiment. part. This embodiment is exemplified by taking the above hybrid automatic switch component in which the switch on the working power supply branch and the switch on the standby power supply branch both use the above-mentioned main channel series solid-state switch as an example.

In the normal power supply state of the dual power supply redundant power supply system, all the switch circuits (that is, the switch circuits on the A, B, and C phase lines) in the main switch component of the working power supply branch in the automatic transfer switch device are in In the closed state, the power of the working power supply is provided to the load through the transfer switch device; and all switch circuits (that is, phases A, B, and C) in the standby transfer switch components of the standby power supply branch in the automatic transfer switch device switch circuits on the line) are in an open state, and the backup power supply does not provide power to the load.

The monitoring system continuously or periodically monitors the working state of the entire power supply system, such as abnormal conditions in the system: the sensor in the working power supply branch monitors the working state of the working power supply, and the sensor in the backup power supply branch monitors the working state of the backup power supply , The sensor in the load branch monitors the working state of the load.

The monitoring system sends a corresponding fault signal to the control and protection system when it detects that the working power supply is faulty or the voltage drop is too large. After receiving the signal indicating the failure of the working power supply from the monitoring system, the control and protection system judges that the working power supply is faulty and needs to switch the power supply from the working power supply to the standby power supply. At this time, the control unit in the control protection system sends an opening command to the switch part of the working power supply and a closing command to the switch part of the standby power supply, thereby controlling the switch part of the working power supply to disconnect and control the standby power supply. The transfer switch component of the power source is closed to establish an electrical connection between the backup power source and the load, thereby providing power through the backup power box load.

During normal operation, all mechanical switches on the A-phase, B-phase and C-phase lines in the main transfer switch unit are closed, and the current on each phase line flows through the respective mechanical switches to provide power to the load. When the sensor detects the failure of the working power supply, it sends alarm information to the control and protection system. After receiving the alarm information,

The control unit in the control protection system issues an opening command to the main switch component in the automatic transfer switch device, controls the solid state switch in the main solid state switch branch to conduct, and disconnects the solid state switch in the mechanical switch branch switch, so as to force the current to be transferred from the mechanical switch branch to the main solid-state switch branch; when the current transfer is completed, the mechanical switch that controls the mechanical switch branch is turned off, and the mechanical switch zero-crosses the arc and extinguishes the arc. When the mechanical switch is opened and the contact gap can withstand the corresponding transient recovery voltage, the solid-state switch in the main solid-state switch branch is controlled to be turned off. At this time, the line energy is absorbed by the MOV, and the main switch current drops to zero. At the same time, an opening command is issued to the standby switch component in the automatic transfer switch device to control the main solid state switch branch in the standby switch component to conduct; and control the mechanical switch branch in the standby switch component. The mechanical switch of the circuit is closed, while the solid state switch of the mechanical switch branch is controlled to be turned on, and the main solid state switch branch is controlled to be turned off. The closing process of the standby switch component is completed, thereby realizing the closing of the switch device in the standby power supply branch, so that the standby working power supply supplies power to the load.

In the dual power redundant power supply system, the process of switching from supplying power to the load from the standby power supply to supplying power to the load from the working power supply and the process of switching from supplying power to the load from the working power supply to supplying power to the load from the standby power supply similar, and will not be repeated here.

After monitoring the failure of the load, the sensor in the load branch will send the monitored failure information to the control and protection system. The control and protection system can turn off the switch components in the working power supply branch and the backup power supply branch according to the fault information, so as to disconnect any power supply to supply power to the load.

The monitoring system simultaneously detects the switching off state, and feeds back the state information to the control and protection system to ensure the off and on.

The control protection system also realizes the control of other tie switches or receives the status information of other tie switches according to the received information, and sends all the received information to the remote computer. Open or closed information.

In the embodiments, three-phase alternating current is taken as an example for illustration, but those skilled in the art should realize that the switch circuit, switch device, system and control method thereof of the present invention will not deviate from the basic inventive concept of the present invention. Not limited to the three-phase alternating current for the purpose of illustration in the specification, the switching circuit, switching device, system and control method thereof of the present invention are applicable to systems including but not limited to direct current and alternating current.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them. The two steps before and after do not necessarily mean that there must be a sequential execution order, as long as the technical problems of the present invention can be solved, and the two steps before and after do not necessarily mean that the order not listed in the invention must be excluded. other steps, and the main device and auxiliary device in the description do not necessarily represent the main and auxiliary, the first device and the second device do not necessarily represent the sequence, they are only used for distinction; similarly, each element and component of the system It does not necessarily mean that there is a direct electrical connection between them, and the specification only expresses a logical relationship. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these Modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. a hybrid switch circuit of a main path series solid-state switch, is characterized in that, The hybrid switch circuit includes a mechanical switch branch, a main solid state switch branch, and an energy absorption branch, and the mechanical switch branch, the main solid state switch branch, and the energy absorption branch are connected in parallel; in, The main solid-state switch branch includes a plurality of series-connected solid-state switches; The mechanical switch branch includes a mechanical switch and a solid-state switch, and the solid-state switch serves as an auxiliary solid-state switch; The solid state switch includes a power electronic switch/diode anti-parallel circuit and a capacitor, the power electronic switch/diode anti-parallel circuit is connected in parallel with the capacitor; wherein, The solid state switch includes a first controllable thyristor/diode anti-parallel circuit, a second controllable thyristor/diode anti-parallel circuit, a third controllable thyristor/diode anti-parallel circuit, and a fourth controllable thyristor/diode anti-parallel circuit; The first controllable thyristor/diode anti-parallel circuit is connected in series with the second controllable thyristor/diode anti-parallel circuit to form a first series circuit, the third controllable thyristor/diode anti-parallel circuit and the fourth controllable thyristor/diode anti-parallel circuit connected in series to form a second series circuit, the first series circuit and the second series circuit are both connected in parallel with a capacitor; The hybrid switch circuit is used to control the opening process: control the solid-state switch in the main solid-state switch branch to conduct, and disconnect the solid-state switch in the mechanical switch branch, thereby forcing the current to be transferred from the mechanical switch branch to Main solid-state switch branch; when the current transfer is completed, the mechanical switch that controls the mechanical switch branch is disconnected, the mechanical switch is zero-crossed and arc extinguished, and the mechanical switch moves to the point where the contact gap can withstand When the corresponding transient recovery voltage occurs, the solid-state switch in the main solid-state switch branch is controlled to be turned off. At this time, the line energy is absorbed by the MOV, and the main switch current drops to zero; The hybrid switch circuit is used to control the closing process: control the solid state switch in the main solid state switch branch to turn on, control the mechanical switch in the mechanical switch branch to close, control the mechanical switch branch in the mechanical switch branch. The solid-state switch is turned on. 2. The hybrid switch circuit according to claim 1, characterized in that, The power electronic switches include but are not limited to thyristors, IGBTs or IGCTs. 3. The hybrid switching circuit according to claim 1, wherein, The energy absorption branch includes a lightning arrester. 4. A switching circuit control method, which is applied to the hybrid switch circuit of any one of claims 1-3 in which the main path is connected in series with solid-state switches, characterized in that, Control the main solid state switch branch to be turned on, and the solid state switch in the mechanical switch branch to be disconnected; Control the mechanical switch in the mechanical switch branch to disconnect, and control the main solid-state switch branch to disconnect; The opening control process of the hybrid switch circuit based on the main path series solid state switch is as follows: control the solid state switch in the main solid state switch branch to conduct, and disconnect the solid state switch in the mechanical switch branch, so as to force the current to be controlled by the mechanical switch. The switch branch is transferred to the main solid-state switch branch; when the current transfer is completed, the mechanical switch that controls the mechanical switch branch is disconnected, the mechanical switch is zero-crossed and the arc is extinguished. When the contact gap can withstand the corresponding transient recovery voltage, the solid-state switch in the main solid-state switch branch is controlled to be turned off. At this time, the line energy is absorbed by the MOV, and the main switch current drops to zero. 5. The switching circuit control method according to claim 4, wherein, When the contact gaps of the mechanical switches in the mechanical switch branches can withstand the transient recovery voltage, the main solid state switch branch is controlled to be disconnected. 6. A switch circuit control method, applied to the hybrid switch circuit of any one of claims 1-3, wherein the main path is connected in series with a solid-state switch, wherein, controlling the main solid state switch branch to be turned on; controlling the mechanical switch of the mechanical switch branch to be closed, and controlling the solid state switch of the mechanical switch branch to be turned on; The main solid state switch branch is controlled to be disconnected. 7. An automatic transfer switch device, characterized in that, the automatic transfer switch device comprises a main transfer switch component and a backup switch component, wherein, The main switch component includes three hybrid switch circuits with solid-state switches connected in series in the main path according to any one of claims 1-3, which are respectively used in the A-phase, B-phase, and C-phase branches of the three-phase electricity; The standby switch component includes three hybrid switch circuits with solid-state switches connected in series in the main path according to any one of claims 1-3, which are respectively used in the A-phase, B-phase, and C-phase branches of the three-phase electricity. 8. A power switching protection system, characterized in that, The power switching protection system includes: Working power and backup power; The automatic transfer switch device according to claim 7, wherein the main transfer switch component in the automatic transfer switch device is connected with the working power supply, and the backup transfer switch component is connected with the backup power supply; A monitoring system for monitoring the working state of the working power source and/or the backup power source; A control and protection system, according to the switch circuit control method described in any one of claims 4-5, to control the opening of the main switch and/or the backup switch in the automatic transfer switch device, and/or according to claim 6 The switch circuit control method according to the invention controls the closing of the main switch part and/or the standby switch part in the automatic switch device. 9. The power switching protection system according to claim 8, wherein, The monitoring system is further configured to send the information of the working state to the control and protection system, and the control and protection system controls the automatic transfer switch device in the main switch and standby switch parts according to the information. switch between. 10. The power switching protection system according to claim 8 or 9, characterized in that: The monitoring system also detects the closing and opening states of the automatic transfer switch, and feeds back the state information to the control and protection system.

Images