Multi-mode dual-path mutual backup power switching system

Abstract

This invention discloses a multi-mode dual-circuit mutual backup power switching system, belonging to the field of low-voltage power distribution technology. It includes: an SA transfer switch, a KM1 contactor, a KM2 contactor, a KT contactor, a main power supply, a backup power supply, a remote-cut main power supply, and a remote-cut backup power supply. The main power supply is connected to the remote-cut main power supply, the backup power supply, the contactors, and the SA transfer switch. The backup power supply is connected to the remote-cut backup power supply, the KM2 contactor, the KT contactor, and the SA transfer switch. The KM1 contactor is connected to the KM2 contactor, the KT contactor, and the SA transfer switch. The KM2 contactor is connected to the KT contactor and the SA transfer switch. The KT contactor is connected to the SA transfer switch. The SA transfer switch is connected to the remote-cut main power supply and the remote-cut backup power supply. Through the coordination of the contactors and transfer switches, automatic switching between mutual backup power supplies under various modes can be completed, improving the reliability of the circuit power supply. Compared with conventional ATSE systems, it has advantages such as low cost, flexible configuration, high reliability, and long lifespan.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power distribution technology, specifically to a multi-mode dual-path backup power switching system. Background Technology

[0002] Voltage instability or faults in the power supply and distribution network system can lead to power outages. Therefore, many load setups with high power supply reliability requirements are equipped with dual power sources, including primary and backup power supplies. When one power source fails, the backup power source can quickly switch in, greatly improving the reliability and continuity of power supply and reducing adverse consequences caused by power outages. The most crucial aspect is the implementation of an automatic switching control loop for the dual backup power sources. Different application scenarios have different requirements for control modes. Common control modes include 'automatic transfer and automatic recovery', 'automatic transfer without automatic recovery', and remote monitoring and control modes.

[0003] Current dual-circuit backup power automatic switching systems use different control modes for different scenarios. That is, power switching is only set for a single control mode and cannot be compatible with three modes. When the scenario changes and the control mode needs to be changed accordingly, the control mode needs to be reset. The switching process is complicated and may affect the normal operation of the load. Summary of the Invention

[0004] To address the problems of existing technologies, this invention provides a multi-mode dual-path backup power switching system, including: a main load circuit. The main load circuit includes: a contactor, a power supply, and an SA changeover switch; The contactors include: KM1 contactor, KM2 contactor and KT contactor; The power supply includes: main power supply, backup power supply, remote main power supply, and remote backup power supply; The main power supply is connected to the remote main power supply, the backup power supply, the contactor, and the SA changeover switch, respectively. The backup power supply is connected to the remote backup power supply, KM2 contactor, KT contactor and SA changeover switch respectively; The KM1 contactor is connected to the KM2 contactor, the KT contactor, and the SA changeover switch, respectively. The KM2 contactor is connected to the KT contactor and the SA changeover switch respectively; The KT contactor is connected to the SA changeover switch; The SA transfer switch is connected to the remote main power supply and the remote backup power supply respectively; The SA changeover switch enables automatic switching between three different control modes: automatic transfer and automatic reset, automatic transfer without automatic reset, and remote control. The contactor control circuit enables automatic switching of backup power supplies in the corresponding modes. The automatic transfer without automatic reset mode means that after the main power supply fails, it automatically switches to the backup power supply. After the main power supply is restored, it continues to be powered by the backup power supply. The external main power supply and backup power supply supply power in sequence. The excitation coil circuit of KM1 contactor is directly powered from the main power supply terminal, and the circuit is connected in series with the auxiliary normally closed contact of KM2 contactor. The excitation coil circuit of KM2 contactor is directly powered from the backup power supply terminal, and the circuit is connected in series with the auxiliary normally closed contact of KM1 contactor. After the main power supply is energized, the excitation coil of contactor KM1 is energized, the main contacts of contactor KM1 close, the main circuit is switched on, and the normally closed auxiliary contact becomes normally open to cut off the excitation coil circuit of contactor KM2. After the backup power supply is energized, the excitation coil of contactor KM2 remains unenergized, and the circuit remains in the main circuit switched-on state. When the main power supply fails, the excitation coil of contactor KM1 loses power, the main contacts of contactor KM1 return to their normally open state and the main circuit is switched off, the auxiliary contacts of contactor KM1 return to their normally closed state, the excitation coil of contactor KM2 becomes energized and attracts the main contacts of contactor KM1, and the standby circuit is switched on; when the main power supply is restored, since the excitation coil circuit of contactor KM1 is still disconnected by the auxiliary contacts of contactor KM2 and cannot be energized, the circuit remains in the standby circuit switched on state, and the main circuit is switched off state. The self-transfer and self-recovery mode means that after the main power supply fails, it automatically switches to the backup power supply. After the main power supply is restored, it automatically switches back to the main power supply. The KT contactor excitation coil circuit draws power from the main power supply, the KM1 contactor excitation coil circuit draws power from the main power supply, and the energized delayed closing contact of the KT contactor is connected in series in the circuit. The KM2 contactor excitation coil circuit draws power from the backup power supply, and the instantaneous normally closed contact of the KT contactor is connected in series in the circuit. The main power supply is energized first, the KT contactor excitation coil is energized, the KM2 contactor excitation coil circuit is immediately cut off, the KM1 contactor excitation coil circuit is delayed and then connected. The main contacts of the KM1 contactor are attracted, the main circuit is switched on, the backup power supply is energized, the KM2 contactor excitation coil is already open, and the main circuit remains switched on. After the main power supply fails, the excitation coil of the KT contactor loses power, the excitation coil circuit of the KM1 contactor disconnects, the main circuit is switched out, the excitation coil circuit of the KM2 contactor closes, and the standby circuit is switched in; after the main power supply is restored, the excitation coil of the KT contactor is re-energized, the standby circuit of the KM2 contactor is momentarily disconnected, the KM1 contactor excitation coil circuit is switched out, and the main circuit is switched in again after a delay. In the remote control mode, the main and backup circuits are controlled by a remote backend signal. The KM1 contactor coil is powered by the main circuit, and a remote backend control contact is connected in series in the circuit. The KM2 contactor excitation coil is powered by the backup circuit, and a remote backend control contact is connected in series in the circuit. The closing of the main contacts of both the KM1 and KM2 contactors is controlled by the remote backend signal. The backend monitors the status of the main and backup power supplies in real time and makes corresponding control outputs.

[0005] Furthermore, the KM1 contactor includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KM1 terminal 11, KM1 terminal 13, KM1 terminal 1, KM1 terminal 3 and KM1 terminal A1 arranged sequentially; The lower terminal includes: KM1 terminal 12, KM1 terminal 14, KM1 terminal 2, KM1 terminal 4 and KM1 terminal A2 arranged sequentially; The terminal 11 of KM1 is connected to the contactor of KM2; The KM1 terminal 13 is connected to the SA changeover switch; Terminal 1 of KM1 is connected to the main power supply. The KM1 terminal 3 is connected to the main power supply and the KT contactor respectively; The KM1 terminal A1 is connected to the KM1 terminal 3 and the KT contactor respectively; The KM1 terminal 12 is connected to the SA changeover switch; The KM1 terminal 14 is connected to the KT contactor; Terminal 2 of KM1 is connected to contactor KM2; Terminal 4 of KM1 is connected to contactor KM2. Terminal A2 of KM1 is connected to the SA changeover switch, KT contactor and KM2 contactor respectively.

[0006] Furthermore, the KM2 contactor includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KM2 terminal 11, KM2 terminal 13, KM2 terminal 1, KM2 terminal 3 and KM2 terminal A1 arranged sequentially; The lower terminal includes: KM2 terminal 12, KM2 terminal 14, KM2 terminal 2, KM2 terminal 4 and KM2 terminal A2 arranged sequentially; The KM2 terminal 11 is connected to the SA changeover switch; The KM2 terminal 13 is connected to the SA changeover switch; Terminal 1 of KM2 is connected to the backup power supply; The KM2 terminal 3 is connected to the backup power supply and the KM2 terminal 14; The KM2 terminal A1 is connected to its own KM2 terminal 14; The KM2 terminal 12 is connected to the KM1 contactor terminal A2, the KT contactor, and the SA changeover switch, respectively. The KM2 terminal 14 is connected to the KM2 terminal A1; The terminal 2 of KM2 is connected to the terminal 2 of KM1; The KM2 terminal 4 is connected to the KM1 terminal 4; The KM2 terminal A2 is connected to the KM1 terminal 11, the SA changeover switch, and the KT contactor, respectively.

[0007] Furthermore, the KT contactor includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KT terminal 13, KT terminal 11 and KT terminal A1 arranged in sequence; The lower terminal includes: KT terminal 14, KT terminal 12 and KT terminal A2 arranged in sequence; The KT terminal 13 is connected to the KT terminal A1 respectively; The KT terminal 11 is connected to the SA changeover switch; The KT terminal A1 is connected to the SA changeover switch; The KT terminal 14 is connected to the KM1 terminal A2 and the KM2 terminal 12 respectively; The KT terminal 12 is connected to the SA changeover switch; The KT terminal A2 is connected to the KM1 terminal A1, the KM1 terminal 3, and the KM1 terminal 14, respectively.

[0008] Furthermore, the SA changeover switch includes an upper terminal and a lower terminal, the upper terminal and the lower terminal being positioned correspondingly; The upper terminals include: SA terminal 13, SA terminal 1, SA terminal 5, SA terminal 9, SA terminal 15, SA terminal 7, SA terminal 11 and SA terminal 3; The lower terminals include: SA terminal 14, SA terminal 2, SA terminal 6, SA terminal 10, SA terminal 16, SA terminal 8, SA terminal 12 and SA terminal 4; The SA terminal 13 is connected to the SA terminal 5, the SA terminal 9, the main power supply, and the remote main power supply, respectively. The SA terminal 1 is connected to the remote main power supply; The SA terminal 15 is connected to the backup power supply, SA terminal 7, SA terminal 11 and remote backup power supply respectively. The SA terminal 3 is connected to the remote backup power supply; The SA terminal 14 is connected to the KM1 terminal 13; The SA terminal 2 is connected to the KM1 terminal A2 and the KM2 terminal 12 respectively; The SA terminal 6 is connected to the KT terminal 13 and the KT terminal A1 respectively; The SA terminal 10 is connected to the KM2 terminal 11; The SA terminal 16 is connected to the KM2 terminal 13; The SA terminal 8 is connected to the KT terminal 11; The SA terminal 12 is connected to the KM1 terminal 12; The SA terminal 4 is connected to the KM2 terminal A2 and the KT terminal 12.

[0009] The beneficial effects of this invention are: By using a contactor as the main load circuit for two power supplies and cooperating with a transfer switch to complete automatic switching between backups under various modes, the reliability of the circuit power supply is improved. The transfer switch is used to realize the switching of different control modes, and can realize three common modes: automatic transfer and automatic recovery, automatic transfer without automatic recovery, and remote control. Compared with conventional ATSE, it has advantages such as low cost, flexible configuration, high reliability, and long service life. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the principle of the multi-mode dual-path backup power switching control unit provided by the present invention; Figure 2 This is a schematic diagram of the relay control mode of the self-transfer non-self-reset mode provided by the present invention; Figure 3 This is a schematic diagram of the self-transfer and self-recovery relay control mode provided by the present invention; Figure 4 This is a schematic diagram of the remote control mode relay control mode provided by the present invention.

[0012] Figure label: 1 is KM1 contactor, 2 is KM2 contactor, 3 is KT contactor, 4 is main power supply, 5 is backup power supply, 6 is remote main power supply, and 7 is remote backup power supply. Implementation

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0014] See Figures 1 to 4 A multi-mode dual-path backup power switching system, including: main load circuit; The main load circuit includes: a contactor, a power supply, and an SA changeover switch 8; The contactors include: KM1 contactor 1, KM2 contactor 2 and KT contactor 3; The power supply includes: main power supply 4, backup power supply 5, remote main power supply 6, and remote backup power supply 7; The main power supply 4 is connected to the remote main power supply 6, the backup power supply 5, the contactor, and the SA changeover switch 8, respectively. The backup power supply 5 is connected to the remote backup power supply 7, KM2 contactor 2, KT contactor 3 and SA changeover switch 8 respectively; The KM1 contactor 1 is connected to the KM2 contactor 2, the KT contactor, and the SA changeover switch 8, respectively; The KM2 contactor 2 is connected to the KT contactor 3 and the SA changeover switch 8 respectively; The KT contactor 3 is connected to the SA changeover switch 8; The SA transfer switch 8 is connected to the remote main power supply 6 and the remote backup power supply 7 respectively; The SA changeover switch 8 enables automatic switching between three different control modes: automatic transfer and automatic reset, automatic transfer without automatic reset, and remote control. The contactor control circuit enables automatic switching of backup power supplies in the corresponding modes.

[0015] The KM1 contactor 1 includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KM1 terminal 11, KM1 terminal 13, KM1 terminal 1, KM1 terminal 3 and KM1 terminal A1 arranged sequentially; The lower terminal includes: KM1 terminal 12, KM1 terminal 14, KM1 terminal 2, KM1 terminal 4 and KM1 terminal A2 arranged sequentially; The terminal 11 of KM1 is connected to the contactor 2 of KM2; The KM1 terminal 13 is connected to the SA changeover switch 8; Terminal 1 of KM1 is connected to the main power supply. The KM1 terminal 3 is connected to the main power supply and the KT contactor 3 respectively; The KM1 terminal A1 is connected to the KM1 terminal 3 and the KT contactor 3 respectively; The KM1 terminal 12 is connected to the SA changeover switch 8; The KM1 terminal 14 is connected to the KT contactor 3; The terminal 2 of KM1 is connected to the contactor 2 of KM2; The terminal 4 of KM1 is connected to the contactor 2 of KM2; The KM1 terminal A2 is connected to the SA changeover switch 8, KT contactor 3 and KM2 contactor 2 respectively.

[0016] The KM2 contactor 2 includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KM2 terminal 11, KM2 terminal 13, KM2 terminal 1, KM2 terminal 3 and KM2 terminal A1 arranged sequentially; The lower terminal includes: KM2 terminal 12, KM2 terminal 14, KM2 terminal 2, KM2 terminal 4 and KM2 terminal A2 arranged sequentially; The KM2 terminal 11 is connected to the SA changeover switch 8; The KM2 terminal 13 is connected to the SA changeover switch 8; Terminal 1 of KM2 is connected to the backup power supply; The KM2 terminal 3 is connected to the backup power supply and the KM2 terminal 14; The KM2 terminal A1 is connected to its own KM2 terminal 14; The KM2 terminal 12 is connected to the KM1 contactor terminal A2, the KT contactor 3 and the SA changeover switch 8 respectively; The KM2 terminal 14 is connected to the KM2 terminal A1; The terminal 2 of KM2 is connected to the terminal 2 of KM1; The KM2 terminal 4 is connected to the KM1 terminal 4; The KM2 terminal A2 is connected to the KM1 terminal 11, the SA changeover switch 8, and the KT contactor 3, respectively.

[0017] The KT contactor 3 includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KT terminal 13, KT terminal 11 and KT terminal A1 arranged in sequence; The lower terminal includes: KT terminal 14, KT terminal 12 and KT terminal A2 arranged in sequence; The KT terminal 13 is connected to the KT terminal A1 respectively; The KT terminal 11 is connected to the SA changeover switch 8; The KT terminal A1 is connected to the SA changeover switch 8; The KT terminal 14 is connected to the KM1 terminal A2 and the KM2 terminal 12 respectively; The KT terminal 12 is connected to the SA changeover switch 8; The KT terminal A2 is connected to the KM1 terminal A1, the KM1 terminal 3, and the KM1 terminal 14, respectively.

[0018] The SA changeover switch 8 includes an upper terminal and a lower terminal, and the upper terminal and the lower terminal are positioned correspondingly. The upper terminals include: SA terminal 13, SA terminal 1, SA terminal 5, SA terminal 9, SA terminal 15, SA terminal 7, SA terminal 11 and SA terminal 3; The lower terminals include: SA terminal 14, SA terminal 2, SA terminal 6, SA terminal 10, SA terminal 16, SA terminal 8, SA terminal 12 and SA terminal 4; The SA terminal 13 is connected to the SA terminal 5, the SA terminal 9, the main power supply, and the remote main power supply 6, respectively. The SA terminal 1 is connected to the remote main power supply 6; The SA terminal 15 is connected to the backup power supply, SA terminal 7, SA terminal 11 and remote backup power supply respectively. The SA terminal 3 is connected to the remote backup power supply 7; The SA terminal 14 is connected to the KM1 terminal 13; The SA terminal 2 is connected to the KM1 terminal A2 and the KM2 terminal 12 respectively; The SA terminal 6 is connected to the KT terminal 13 and the KT terminal A1 respectively; The SA terminal 10 is connected to the KM2 terminal 11; The SA terminal 16 is connected to the KM2 terminal 13; The SA terminal 8 is connected to the KT terminal 11; The SA terminal 12 is connected to the KM1 terminal 12; The SA terminal 4 is connected to the KM2 terminal A2 and the KT terminal 12.

[0019] Among them, KM1 contactor terminal 1, KM1 contactor terminal 2, KM1 contactor terminal 3 and KM1 contactor terminal 4 are main contacts, and KM1 contactor terminal 11, KM1 contactor terminal 12, KM1 contactor terminal 13 and KM1 contactor terminal 14 are auxiliary contacts.

[0020] The main contacts of contactor 1 (KM1) and contactor 2 (KM2) are independent of each other and serve as input ports for two external backup power supplies. When their output terminals are connected in phase, they serve as the total load output port, forming a main load circuit with two inputs and one output. Each contactor is equipped with a set of auxiliary contacts with one open and one closed contacts for relay control and status output.

[0021] The main contacts of the contactor are independent of each other and serve as input ports for two external backup power supplies. The output ports are connected in parallel as the total output port of the load, forming a main load circuit with 2 inputs and 1 output. The contactor is equipped with 1 open and 1 closed auxiliary contact for relay control and status output.

[0022] The changeover switch integrates three types of contacts according to design requirements, with two groups of each type. It is divided into three levels: "remote control mode", "automatic transfer and self-reset mode" and "automatic transfer and non-reset mode". Two signal indicator lights are integrated on the operation panel to indicate the status information of the main circuit.

[0023] See Figure 2 The automatic transfer mode switch has terminals 9-10 and 11-12 connected. This means that after the main power supply fails, it automatically switches to the backup power supply. After the main power supply is restored, it continues to be powered by the backup power supply. The external main power supply and backup power supply are powered in sequence. The excitation coil circuit of contactor KM1 is directly powered from the main power supply and is connected in series with the auxiliary normally closed contact of contactor KM2. The excitation coil circuit of contactor KM2 is directly powered from the backup power supply and is connected in series with the auxiliary normally closed contact of contactor KM1. After the main power supply is energized, the excitation coil of contactor KM1 is energized, the main contacts of KM1 are energized, the main circuit is switched on, and the normally closed auxiliary contact becomes normally open to cut off the excitation coil circuit of contactor KM2. After the backup power supply is energized, the excitation coil of contactor KM2 is still not energized, and the circuit remains in the main circuit switched on state. When the main power supply fails, the excitation coil of contactor KM1 loses power, the main contacts of KM1 return to their normally open state and the main circuit is switched out, the auxiliary contacts of KM1 return to their normally closed state, the excitation coil of contactor KM2 becomes energized and attracts the main contacts of KM2, and the standby circuit is switched in; when the main power supply is restored, since the excitation coil circuit of contactor KM1 is still cut off by the auxiliary contacts of contactor KM2 and cannot be energized, the circuit remains in the standby circuit switched in state, and the main circuit is in the switched-out state.

[0024] See Figure 3 When the automatic transfer switch is activated, terminals 5-6 and 7-8 are closed. This means that after the main power supply fails, it automatically switches to the backup power supply. After the main power supply is restored, it automatically switches back to the main power supply. The KT contactor excitation coil circuit draws power from the main power supply, the KM1 contactor excitation coil circuit draws power from the main power supply, and the energized delayed closing contact of the KT contactor is connected in series in the circuit. The KM2 contactor excitation coil circuit draws power from the backup power supply, and the instantaneous normally closed contact of the KT contactor is connected in series in the circuit. When the main power supply is energized first, the KT contactor excitation coil is energized, immediately disconnecting the KM2 contactor excitation coil circuit and delaying the connection of the KM1 contactor excitation coil circuit. The main contacts of the KM1 contactor close, the main circuit is switched on, the backup power supply is energized, and the KM2 contactor excitation coil is already disconnected, maintaining the state of the main circuit being switched on. After the main power supply fails, the excitation coil of the KT contactor loses power, the excitation coil circuit of the KM1 contactor disconnects, the main circuit is switched out, the excitation coil circuit of the KM2 contactor closes, and the standby circuit is switched in; after the main power supply is restored, the excitation coil of the KT contactor is re-energized, the standby circuit of the KM2 contactor is momentarily disconnected, the KM1 contactor excitation coil circuit is switched out after a delay, and the main circuit is switched in again.

[0025] See Figure 4 When terminals 1-2 of the changeover switch are closed, terminals 3-4 are open in remote control mode, meaning the main and backup circuits are controlled by a remote control signal. The KM1 contactor coil is powered from the main circuit, and a remote control contact is connected in series in the circuit. The KM2 contactor excitation coil is powered from the backup circuit, and a remote control contact is connected in series in the circuit. The closing of the main contacts of both the KM1 and KM2 contactors is controlled by the remote control signal. The remote control monitors the status of the main and backup power supplies in real time and makes corresponding control outputs.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-mode dual-path backup power supply switching system, characterized in that, include: Main load circuit The main load circuit includes: a contactor, a power supply, and an SA changeover switch (8); The contactors include: KM1 contactor (1), KM2 contactor (2) and KT contactor (3). The power supply includes: main power supply (4), backup power supply (5), remote main power supply (6) and remote backup power supply (7); The main power supply (4) is connected to the remote main power supply (6), the backup power supply (5), the contactor and the SA changeover switch (8) respectively; The backup power supply (5) is connected to the remote backup power supply (7), KM2 contactor (2), KT contactor (3) and SA changeover switch (8) respectively; The KM1 contactor (1) is connected to the KM2 contactor (2), the KT contactor (3) and the SA changeover switch (8) respectively; The KM2 contactor (2) is connected to the KT contactor (3) and the SA changeover switch (8) respectively; The KT contactor (3) is connected to the SA changeover switch (8); The SA transfer switch (8) is connected to the remote main power supply (6) and the remote backup power supply (7) respectively; The SA changeover switch (8) realizes automatic switching of three different control modes: automatic transfer and automatic reset, automatic transfer without automatic reset, and remote control. The contactor control circuit realizes automatic switching of the backup power supply in the corresponding mode. The automatic switching mode without automatic recovery means that after the main power supply (4) is powered off, it automatically switches to the backup power supply (5). After the main power supply (4) is powered on again, it continues to be powered by the backup power supply (5). The external main power supply (4) and the backup power supply (5) are powered in sequence. The excitation coil circuit of KM1 contactor (1) is directly powered from the main power supply (4) terminal. The circuit is connected in series with the auxiliary normally closed contact of KM2 contactor (2). The excitation coil circuit of KM2 contactor (2) is directly powered from the backup power supply (5) terminal. The circuit is connected in series with the auxiliary normally closed contact of KM1 contactor (1). After the main power supply (4) is energized, the excitation coil of KM1 contactor (1) is energized, the main contacts of KM1 contactor (1) are attracted, the main circuit is switched in, the auxiliary normally closed contact becomes normally open and cuts off the excitation coil circuit of KM2 contactor (2), after the backup power supply (5) is energized; the excitation coil of KM2 contactor (2) is still not energized, and the circuit remains in the main circuit switched in state unchanged; When the main power supply (4) fails, the excitation coil of contactor (1) of contactor (4) loses power, the main contact of contactor (1) of contactor (4) returns to normal open and the main circuit is cut off, the auxiliary contact of contactor (1) of contactor (4) returns to normal closed, the excitation coil of contactor (2) of contactor (4) is energized and attracts the main contact of contactor (1) of contactor (4), and the standby circuit is switched on; when the main power supply (4) is restored, since the excitation coil circuit of contactor (1) of contactor (4) is still cut off by the auxiliary contact of contactor (2) of contactor (4) and cannot be energized, the circuit still remains in the standby circuit switched on and the main circuit is in the switched-off state; The self-switching and self-restoring mode means that after the main power supply (4) loses power, it automatically switches to the backup power supply (5), and after the main power supply (4) is restored to power, it automatically switches back to the main power supply (4). The excitation coil circuit of KT contactor (3) draws power from the main power supply (4), the excitation coil circuit of KM1 contactor (1) draws power from the main power supply (4), and the energized delayed closing contact of KT contactor (3) is connected in series in the circuit. The excitation coil circuit of KM2 contactor (2) draws power from the backup power supply (5). 5) Power is drawn, and the instantaneous normally closed contact of KT contactor (3) is connected in series in the circuit; the main power supply (4) is energized first, the excitation coil of KT contactor (3) is energized, and the excitation coil circuit of KM2 contactor (2) is immediately cut off. The excitation coil circuit of KM1 contactor (1) is connected after a delay. The main contact of KM1 contactor (1) is attracted, the main circuit is switched in, the backup power supply is energized, the excitation coil of KM2 contactor (2) has been disconnected, and the state of the main circuit being switched in remains unchanged; After the main power supply (4) is de-energized, the excitation coil of KT contactor (3) is de-energized, the excitation coil circuit of KM1 contactor (1) is disconnected, the main circuit is cut off, the excitation coil circuit of KM2 contactor (2) is closed, and the standby circuit is switched on; after the main power supply (4) is restored to power, the excitation coil of KT contactor (3) is re-energized, the standby circuit of KM2 contactor (2) is cut off momentarily, the excitation coil circuit of KM1 contactor (1) is switched on after a delay, and the main circuit is switched on again; The remote control mode, namely the main and backup circuits are controlled by the remote background signal, the coil of contactor (1) of KM1 is powered by the main circuit and the remote background control contact is connected in series in the circuit, the excitation coil of contactor (2) of KM2 is powered by the backup circuit and the remote background control contact is connected in series in the circuit, the closing of the main contacts of contactor (1) of KM1 and contactor (2) is controlled by the remote background signal, and the background monitors the status of the main and backup power supplies in real time and makes corresponding control outputs.

2. The multi-mode dual-path backup power switching system according to claim 1, characterized in that, The KM1 contactor (1) includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are in corresponding positions, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KM1 terminal 11, KM1 terminal 13, KM1 terminal 1, KM1 terminal 3 and KM1 terminal A1 arranged sequentially; The lower terminal includes: KM1 terminal 12, KM1 terminal 14, KM1 terminal 2, KM1 terminal 4 and KM1 terminal A2 arranged sequentially; The terminal 11 of KM1 is connected to the contactor (2) of KM2; The KM1 terminal 13 is connected to the SA changeover switch (8); The KM1 terminal 1 is connected to the main power supply (4); The KM1 terminal 3 is connected to the main power supply (4) and the KT contactor (3) respectively; The KM1 terminal A1 is connected to the KM1 terminal 3 and the KT contactor (3) respectively; The KM1 terminal 12 is connected to the SA changeover switch (8); The KM1 terminal 14 is connected to the KT contactor (3); The terminal 2 of KM1 is connected to the contactor (2) of KM2; The terminal 4 of KM1 is connected to the contactor (2) of KM2; The KM1 terminal A2 is connected to the SA changeover switch (8), KT contactor (3) and KM2 contactor (2) respectively.

3. The multi-mode dual-path backup power switching system according to claim 2, characterized in that, The KM2 contactor (2) includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are positioned correspondingly, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KM2 terminal 11, KM2 terminal 13, KM2 terminal 1, KM2 terminal 3 and KM2 terminal A1 arranged sequentially; The lower terminal includes: KM2 terminal 12, KM2 terminal 14, KM2 terminal 2, KM2 terminal 4 and KM2 terminal A2 arranged sequentially; The KM2 terminal 11 is connected to the SA changeover switch (8); The KM2 terminal 13 is connected to the SA changeover switch (8); The KM2 terminal 1 is connected to the backup power supply (5); The KM2 terminal 3 is connected to the backup power supply (5) and the KM2 terminal 14; The KM2 terminal A1 is connected to its own KM2 terminal 14; The KM2 terminal 12 is connected to the KM1 contactor terminal A2, the KT contactor (3), and the SA changeover switch (8) respectively; The KM2 terminal 14 is connected to the KM2 terminal A1; The terminal 2 of KM2 is connected to the terminal 2 of KM1; The KM2 terminal 4 is connected to the KM1 terminal 4; The KM2 terminal A2 is connected to the KM1 terminal 11, the SA changeover switch (8), and the KT contactor (3), respectively.

4. The multi-mode dual-path backup power switching system according to claim 3, characterized in that, The KT contactor (3) includes an upper terminal and a lower terminal, the upper terminal and the lower terminal are in corresponding positions, and a switch for conducting is provided between the upper terminal and the lower terminal; The upper terminal includes: KT terminal 13, KT terminal 11 and KT terminal A1 arranged in sequence; The lower terminal includes: KT terminal 14, KT terminal 12 and KT terminal A2 arranged in sequence; The KT terminal 13 is connected to the KT terminal A1 respectively; The KT terminal 11 is connected to the SA changeover switch (8); The KT terminal A1 is connected to the SA changeover switch (8); The KT terminal 14 is connected to the KM1 terminal A2 and the KM2 terminal 12 respectively; The KT terminal 12 is connected to the SA changeover switch (8); The KT terminal A2 is connected to the KM1 terminal A1, the KM1 terminal 3, and the KM1 terminal 14, respectively.

5. The multi-mode dual-path backup power switching system according to claim 4, characterized in that, The SA changeover switch (8) includes an upper terminal and a lower terminal, the upper terminal and the lower terminal being in corresponding positions; The upper terminals include: SA terminal 13, SA terminal 1, SA terminal 5, SA terminal 9, SA terminal 15, SA terminal 7, SA terminal 11 and SA terminal 3; The lower terminals include: SA terminal 14, SA terminal 2, SA terminal 6, SA terminal 10, SA terminal 16, SA terminal 8, SA terminal 12 and SA terminal 4; The SA terminal 13 is connected to the SA terminal 5, the SA terminal 9, the main power supply (4), and the remote main power supply (6), respectively. The SA terminal 1 is connected to the remote main power supply (6); The SA terminal 15 is connected to the backup power supply (5), SA terminal 7, SA terminal 11 and remote and disconnected backup power supply (5) respectively. The SA terminal 3 is connected to the remote backup power supply (7); The SA terminal 14 is connected to the KM1 terminal 13; The SA terminal 2 is connected to the KM1 terminal A2 and the KM2 terminal 12 respectively; The SA terminal 6 is connected to the KT terminal 13 and the KT terminal A1 respectively; The SA terminal 10 is connected to the KM2 terminal 11; The SA terminal 16 is connected to the KM2 terminal 13; The SA terminal 8 is connected to the KT terminal 11; The SA terminal 12 is connected to the KM1 terminal 12; The SA terminal 4 is connected to the KM2 terminal A2 and the KT terminal 12.

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