Dual power switch power distribution system, control device and method thereof, and air conditioner

Abstract

The application discloses a dual-power-supply switch power distribution system, a control device and method thereof and an air conditioner. The device comprises a main power supply and a standby power supply, which are connected to a load-side circuit breaker through a dual-power-supply switch system; the standby power supply is also connected to a first connection end of a bypass system; a second connection end of the bypass system is connected to a common end of a second-level load circuit breaker and the second-level load; in the case that a short-circuit fault occurs between the main power supply and the standby power supply and the load-side circuit breaker, the dual-power-supply switch system disconnects the main power supply and the standby power supply, and the bypass system controls the standby power supply to supply power to the second-level load through the second-level load circuit breaker. The scheme adds a bypass system to the dual-power-supply switch power distribution system, and when a short-circuit fault occurs between the dual-power-supply switch and the load circuit breaker, the bypass system is used to supply power to the second-level load, i.e. important load, thereby improving the reliability of the dual-power-supply switch power distribution system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of dual power supply, and particularly relates to a control device and method of a dual power supply switch power distribution system, the dual power supply switch power distribution system and an air conditioner, and particularly relates to a device and method for improving the reliability of a dual power supply switch power distribution system, the dual power supply switch power distribution system and an air conditioner. BACKGROUND

[0002] According to the current data center specification requirements, the air conditioning system of a B-level and above data center needs to use dual power supply to automatically switch to another power supply when one power supply is powered off.

[0003] In related solutions, mainstream dual power supply switches are mainly divided into two types: PC (Power Contact) level dual power supply switches and CB (Circuit Breake) level dual power supply switches. However, when a short circuit fault occurs between the PC level dual power supply switch and the CB level dual power supply switch and the rear circuit breaker, the rear load is powered off, which affects the normal operation of the rear load (such as the air conditioning system of a data center).

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The present application aims to provide a dual power supply switch power distribution system, a control device and method thereof, and an air conditioner to solve the problem that when a short circuit fault occurs between the PC level dual power supply switch and the CB level dual power supply switch and the rear circuit breaker in a power distribution system using PC and dual power supply switches and CB dual power supply switches, the rear load is powered off. By adding a bypass system to the dual power supply switch power distribution system, the bypass system is used to supply power to the rear important load when a short circuit fault occurs between the dual power supply switch and the rear load circuit breaker, which can improve the reliability of the dual power supply switch power distribution system and quickly restore power supply to the rear equipment when a short circuit fault occurs.

[0006] The application provides a control device of a dual power supply switch power distribution system, which is applied to a dual power supply system powered by a main power supply and a backup power supply; the control device of the dual power supply switch power distribution system comprises a dual power supply switch system, a load side circuit breaker and a bypass system; wherein the main power supply and the backup power supply are connected to the load side circuit breaker through the dual power supply switch system; the load side circuit breaker comprises a circuit breaker of a first level load and a circuit breaker of a second level load; the circuit breaker of the first level load is connected to the first level load, and the circuit breaker of the second level load is connected to the second level load; the backup power supply is also connected to a first connection end of the bypass system; a second connection end of the bypass system is connected to a common end of the circuit breaker of the second level load and the second level load; in the case that short circuit failure does not occur between at least one of the main power supply and the backup power supply and the load side circuit breaker, the switching of power supply between the main power supply and the backup power supply is controlled by the dual power supply switch system; in the case that short circuit failure occurs between the main power supply and the backup power supply and the load side circuit breaker, the main power supply and the backup power supply are disconnected by the dual power supply switch system, and the backup power supply supplies power to the second level load through the circuit breaker of the second level load by the bypass system.

[0007] In some embodiments, the dual power supply switch system comprises a first circuit breaker, a second circuit breaker and a PC level dual power supply switch; the PC level dual power supply switch has a first control contact and a second control contact; wherein the main power supply is connected to the load side circuit breaker through the first circuit breaker and the first control contact of the PC level dual power supply switch; the backup power supply is connected to the load side circuit breaker through the second circuit breaker and the second control contact of the PC level dual power supply switch; and a common end of the backup power supply and the second circuit breaker is connected to the first connection end of the bypass system.

[0008] In some embodiments, the dual power supply switch system further comprises a CB level dual power supply switch; the CB level dual power supply switch has a first circuit breaker, a second circuit breaker, a first control contact and a second control contact; wherein the main power supply is connected to the load side circuit breaker through the first circuit breaker of the CB level dual power supply switch and the first control contact of the CB level dual power supply switch; the backup power supply is connected to the load side circuit breaker through the second circuit breaker of the CB level dual power supply switch and the second control contact of the CB level dual power supply switch; and a common end of the backup power supply and the second circuit breaker of the CB level dual power supply switch is connected to the first connection end of the bypass system.

[0009] In some embodiments, the bypass system comprises a third circuit breaker, a first contactor, and a second contactor; wherein a first connection end of the third circuit breaker is connected to the backup power supply as a first connection end of the bypass system; a second connection end of the third circuit breaker is connected to a first connection end of the first contactor and a first connection end of the second contactor, respectively; in the case that the number of the second-level loads is two, a second connection end of the first contactor and a second connection end of the second contactor are connected to the circuit breakers of the corresponding second-level loads as second connection ends of the bypass system.

[0010] In some embodiments, further comprising a dual-power control device and a reminding device; wherein the dual-power control device is configured to control the bypass system to connect the backup power supply and control the reminding device to send a reminding message that a short-circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker in the case that a short-circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker; wherein in the case that the bypass system comprises the first contactor and the second contactor, the first contactor, the second contactor, the reminding device, and the circuit breakers of the second-level loads are all controlled by the dual-power control device.

[0011] In some embodiments, a monitoring device is configured to monitor the incoming power supply of the dual power supply or the power supply state of the dual power supply; the dual-power control device is further configured to determine whether a short-circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker according to the incoming power supply of the dual power supply or the power supply state of the dual power supply; and in the case that a short-circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker, the dual-power control device is configured to control the bypass system to connect the backup power supply and control the reminding device to send a reminding message that a short-circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0012] In some embodiments, wherein the dual power switch system comprises a PC level dual power switch, the monitoring device comprises: a first solid state relay, and a second solid state relay; a coil of the first solid state relay is connected to the main power supply, and a coil of the second solid state relay is connected to the backup power supply; a normally closed contact of the first solid state relay and a normally closed contact of the second solid state relay are both connected to the dual power control device; in the case that the state of the normally closed contact of the first solid state relay and the normally closed contact of the second solid state relay changes simultaneously, it is determined that short circuit faults occur between the main power supply and the backup power supply and the load side circuit breaker; in the case that the dual power switch system comprises a CB level dual power switch, the monitoring device comprises: a normally closed contact of the CB level dual power switch; in the case that the state of the normally closed contact of the CB level dual power switch changes, it is determined that short circuit faults occur between the main power supply and the backup power supply and the load side circuit breaker.

[0013] In another aspect, the present application provides a dual power switch power distribution system, which is matched with the above-mentioned device, and comprises the control device of the dual power switch power distribution system.

[0014] In another aspect, the present application provides an air conditioner, which is matched with the above-mentioned device, and comprises the control device of the dual power switch power distribution system or the dual power switch power distribution system.

[0015] In some embodiments, the air conditioner comprises a computer room air conditioner.

[0016] In another aspect, the present application provides a control method of a dual power switch power distribution system, which is matched with the above-mentioned dual power switch power distribution system and air conditioner, and comprises: in the case that the control device of the dual power switch power distribution system further comprises a monitoring device and a reminding device, monitoring the incoming power supply of the dual power supply or the power supply state of the dual power supply by the monitoring device; determining whether short circuit faults occur between the main power supply and the backup power supply and the load side circuit breaker according to the incoming power supply of the dual power supply or the power supply state of the dual power supply; and in the case that it is determined that short circuit faults occur between the main power supply and the backup power supply and the load side circuit breaker, controlling the bypass system to connect the backup power supply, and controlling the reminding device to send a reminding message that short circuit faults occur between the main power supply and the backup power supply and the load side circuit breaker.

[0017] In some embodiments, in the case that the dual power switch system comprises a first circuit breaker, a second circuit breaker, a PC level dual power switch, the circuit breaker of the second level load comprises a fourth circuit breaker and a fifth circuit breaker, and the bypass system comprises a third circuit breaker, a first contactor and a second contactor, in the case that it is determined that short circuit faults occur between the main power supply and the standby power supply and the load side circuit breaker, the bypass system is controlled to be turned on, comprising: in the case that the third circuit breaker is closed, the first contactor and the second contactor are both controlled to be closed; wherein the normal power supply sequence of the main power supply and the standby power supply is: the first circuit breaker is controlled to be closed first, then the second circuit breaker is controlled to be closed, and finally the third circuit breaker is controlled to be closed; the normal power-off sequence of the main power supply and the standby power supply is: the third circuit breaker is controlled to be disconnected first, then the second circuit breaker is controlled to be disconnected, and finally the first circuit breaker is controlled to be disconnected; in the case that short circuit faults occur between the main power supply and the standby power supply and the load side circuit breaker, the power supply sequence after the short circuit faults are eliminated is: in the case that the number of the second level load is two, after the main power supply and the standby power supply can normally supply power, the circuit breakers of the second level load corresponding to the two second level loads are both controlled to be closed first, and then the first contactor and the second contactor are both controlled to be disconnected.

[0018] Therefore, the scheme of the application, by adding a bypass system to the dual power switch power distribution system adopting a PC level dual power switch and a CB level dual power switch, when short circuit faults occur between the PC level dual power switch and the CB level dual power switch and the rear-end power distribution system, the bypass system can be switched to supply power, so that the rear-end load is quickly restored to power supply; thereby, by adding a bypass system to the dual power switch power distribution system, when short circuit faults occur between the dual power switch and the rear-end load circuit breaker, the bypass system is used to supply power to the rear-end important load, which can improve the reliability of the dual power switch power distribution system, and quickly restore power supply to the rear-end equipment when short circuit faults occur.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application.

[0020] The technical scheme of the application will be further described in detail below with the aid of drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure schematic diagram of an embodiment of the control device of the dual power switch power distribution system of the application;

[0022] Figure 2 The structure schematic diagram of an embodiment of the PC level dual power system;

[0023] Figure 3 Structure diagram of an embodiment of a CB-level dual power supply system;

[0024] Figure 4 Structure diagram of an embodiment of a power supply detection and control device;

[0025] Figure 5 Flow diagram of an embodiment of a control method of a dual power supply switch power distribution system of the present application. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0027] It is considered that when a short circuit fault occurs between the PC-level dual power supply switch and the CB-level dual power supply switch and the rear-end circuit breaker in a power distribution system using a PC and dual power supply switches and CBs, the rear-end load will be powered off.

[0028] Among them, the main function of the PC-level dual power supply switch is to switch between two power supplies to ensure that the standby power supply can quickly replace the power supply when the main power supply fails, thereby ensuring the continuous operation of the load; the PC-level dual power supply switch does not contain a circuit breaker function, so it cannot provide overload or short circuit protection, and a circuit breaker is usually used with the PC-level dual power supply switch for upper-end power distribution; due to the disconnection and reclosing time of the circuit breaker, the switching speed of the PC-level dual power supply switch is usually fast, and the switching can be completed within tens of milliseconds to hundreds of milliseconds.

[0029] The CB-level dual power supply switch integrates the function of the circuit breaker, which not only can switch between two power supplies, but also can provide overload and short circuit protection, and can quickly disconnect the circuit to stop supplying power to the equipment when a short circuit or overload occurs, thereby preventing the equipment and lines from being severely damaged, and a disconnecting switch is usually used with the CB-level dual power supply switch for upper-end power distribution; due to the disconnection and reclosing time of the circuit breaker, the switching speed is relatively slow, usually between hundreds of milliseconds and several seconds. Since the CB-level dual power supply switch itself has short circuit and overload protection functions, a disconnecting switch is usually used with it for upper-end power distribution; among them, the disconnecting switch only has the functions of opening and closing, and does not have the protection function.

[0030] Short-circuit protection refers to the ability to cut off power supply when a short-circuit fault occurs, not to guarantee that a short circuit will not occur. When a CB-class dual power supply switch experiences a short circuit at the fault point (i.e., between the dual power supply switch and the downstream load circuit breaker), it will stop supplying power to the load and will not switch to the backup power supply. When a PC-class dual power supply experiences the aforementioned short-circuit fault (i.e., between the dual power supply switch and the downstream load circuit breaker), it will first disconnect the upstream main power circuit breaker, and then the dual power supply will switch to the backup power supply. However, since the short circuit still exists, the backup power circuit breaker will also disconnect, ultimately causing a power outage in the entire power distribution system.

[0031] Therefore, the present invention proposes a control device for a dual-power switch distribution system, specifically a device to improve the reliability of the dual-power switch distribution system. By adding a bypass system to the PC-level dual-power switch and the CB-level dual-power switch, the bypass system is activated when a short-circuit fault occurs between the dual-power switch and the downstream load circuit breaker to supply power to the important downstream load, thereby improving the reliability of the dual-power switch distribution system and enabling the downstream equipment to quickly restore power supply when the short-circuit fault occurs.

[0032] According to an embodiment of the present invention, a control device for a dual-power switchgear distribution system is provided. See also... Figure 1 The diagram shows a structural schematic of an embodiment of the device of the present invention. This control device for a dual-power switch distribution system is applied to a dual-power system supplied by a main power source and a backup power source; the control device for the dual-power switch distribution system includes: a dual-power switch system, a load-side circuit breaker, and a bypass system.

[0033] The main power supply and the backup power supply are both connected to the load-side circuit breaker after passing through the dual power supply switching system. The load-side circuit breaker includes a circuit breaker for a first-level load and a circuit breaker for a second-level load. The first level is like a normal level, and the second level is like a critical level. The circuit breaker for the first-level load is connected to the first-level load, and the circuit breaker for the second-level load is connected to the second-level load.

[0034] The backup power supply is also connected to the first connection terminal of the bypass system; the second connection terminal of the bypass system is connected to the common terminal of the circuit breaker of the second-level load and the second-level load.

[0035] In the absence of a short circuit fault between at least one of the main power supply and the backup power supply and the load-side circuit breaker, the dual power supply switching system controls the switching of power supply between the main power supply and the backup power supply.

[0036] In the case of a short circuit fault between the main power supply and the standby power supply and the load side circuit breaker, the main power supply and the standby power supply are disconnected by the dual power switch system, and the standby power supply is controlled by the bypass system to supply power to the second level load through the circuit breaker of the second level load.

[0037] The scheme of the present application adopts the measure of adding a bypass system to the dual power switch power distribution system, which is used when a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker to supply power to the rear-end important load, solves the problem that the rear-end load will be completely powered off when the short circuit fault occurs (i.e. a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker), and can improve the reliability of the dual power switch power distribution system and enable the rear-end equipment to quickly recover power supply when the short circuit fault occurs.

[0038] In a conventional case, when the short circuit fault occurs (i.e. a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker), the power supply needs to be restored after the fault is manually eliminated, which takes a long time to restore power supply, and all operations need to be performed manually without automatic control function. The scheme of the present application only needs to cut off the fault point and restore power supply to the rear-end equipment through a simple control device, and then restore the conventional power supply mode after the fault is manually eliminated. The process does not require human intervention, and only needs to restore the normal power supply mode after the fault is manually eliminated. Overall, it solves the problem of long recovery time after the fault occurs in related schemes, and can improve the power supply reliability and continuity of the dual power switch power distribution system.

[0039] In some embodiments, the dual power switch system includes a first circuit breaker (such as circuit breaker QF1), a second circuit breaker (such as circuit breaker QF2), and a PC level dual power switch. The PC level dual power switch has a first control contact and a second control contact.

[0040] The main power supply is connected to the load side circuit breaker through the first circuit breaker and the first control contact of the PC level dual power switch. The standby power supply is connected to the load side circuit breaker through the second circuit breaker and the second control contact of the PC level dual power switch. The common end of the standby power supply and the second circuit breaker is connected to the first connection end of the bypass system.

[0041] Figure 2 The structure diagram of an embodiment of the PC level dual power switch system. In Figure 2In the shown example, the main power supply is connected to the first connection end of the first control contact of the PC level dual power supply switch through the circuit breaker QF1, the standby power supply is connected to the first connection end of the second control contact of the PC level dual power supply switch through the circuit breaker QF2, the second connection end of the first control contact of the PC level dual power supply switch and the second connection end of the second control contact of the PC level dual power supply switch are connected, and then connected to the ordinary load through the ordinary load contactor and connected to the important load through the important load contactor such as the circuit breaker QF4 and the circuit breaker QF5.

[0042] In the scheme of the present application, a bypass system is added for the PC level dual power supply switch. When the short circuit fault (i.e. a short circuit fault between the dual power supply switch and the rear-end load circuit breaker) causes all the circuit breakers at the upper end of the PC level dual power supply switch to trip, the control device starts the bypass system to supply power to the rear-end important load, and at the same time, the control device sends out a fault alarm to remind the operation and maintenance personnel to handle the related fault, so as to quickly restore normal power supply, which can improve the power supply reliability, and the whole process is completed by the control device with independent power supply. That is, in the scheme of the present application, a bypass system is added for the PC level dual power supply switch. When the short circuit fault (i.e. a short circuit fault between the dual power supply switch and the rear-end load circuit breaker) causes all the circuit breakers at the upper end of the PC level dual power supply switch to trip, the bypass system is started to supply power to the rear-end important load, which improves the power supply reliability, and the whole process is completed by the control device with independent power supply.

[0043] In some embodiments, the dual power supply switch system further comprises: a CB level dual power supply switch; the CB level dual power supply switch has a first circuit breaker (such as QT1), a second circuit breaker (such as QT2), a first control contact and a second control contact.

[0044] The main power supply is connected to the load side circuit breaker through the first circuit breaker of the CB level dual power supply switch and the first control contact of the CB level dual power supply switch. The standby power supply is connected to the load side circuit breaker through the second circuit breaker of the CB level dual power supply switch and the second control contact of the CB level dual power supply switch. The common end of the standby power supply and the second circuit breaker of the CB level dual power supply switch is connected to the first connection end of the bypass system.

[0045] Figure 3 The structure schematic diagram of an embodiment of the CB level dual power supply system. In Figure 3In the shown example, the main power source is connected to the first connection end of the first control contact of the CB level dual power switch through the circuit breaker QT1, the standby power source is connected to the first connection end of the second control contact of the CB level dual power switch through the circuit breaker QT2, the second connection end of the first control contact of the CB level dual power switch and the second connection end of the second control contact of the CB level dual power switch are connected, and then connected to the ordinary load through the ordinary load contactor and connected to the important load through the important load contactor such as the circuit breaker QF4 and the circuit breaker QF5. The circuit breaker QT1 and the circuit breaker QT2 have the same effect as the circuit breaker QF1 and the circuit breaker QF2, that is, they are used to stop and supply power to the dual power switch, but the circuit breaker QT1 and the circuit breaker QT2 do not have a protection function.

[0046] In the scheme of the present application, for the CB level dual power switch, a bypass system is added. When the short circuit fault occurs (that is, the short circuit fault occurs between the dual power switch and the rear-end load circuit breaker), the CB level dual power switch trips, and at the same time, the CB level dual power switch provides a short circuit tripping signal to the control device. The control device switches the power supply to the bypass system to supply power to the rear-end important load, and at the same time, the control device sends out a fault alarm to remind the operation and maintenance personnel to handle the related fault, so as to quickly restore normal power supply. The present application can improve the power supply reliability, and the whole process is completed by the independently powered control device. That is, for the CB level dual power switch, a bypass system is added, the CB level dual power switch provides a short circuit tripping signal to the control device, the control device switches the power supply to the bypass system, and the power supply reliability is improved.

[0047] In some embodiments, the bypass system comprises a third circuit breaker (such as the circuit breaker QF3), a first contactor (such as the contactor KM1), and a second contactor (such as the contactor KM2).

[0048] The first connection end of the third circuit breaker is connected to the standby power source as the first connection end of the bypass system, and the second connection end of the third circuit breaker is connected to the first connection end of the first contactor and the first connection end of the second contactor, respectively. In the case where the number of second level loads is two, the second connection end of the first contactor and the second connection end of the second contactor are connected to the circuit breakers of the corresponding second level loads of the two second level loads as the second connection end of the bypass system.

[0049] As Figure 2As shown in the figure, the main power supply is connected to the first connection end of the first contact of the PC level dual power supply switch through the circuit breaker QF1, the standby power supply is connected to the first connection end of the second contact of the PC level dual power supply switch through the circuit breaker QF2, the second connection end of the first contact of the PC level dual power supply switch and the second connection end of the second contact of the PC level dual power supply switch are connected, and then connected to the common end of the important load through the important load contactor such as the circuit breaker QF4 and the circuit breaker QF5. The standby power supply is also connected to the common end of the important load through the circuit breaker QF3, the contact of the contactor KM1, and the contact of the contactor KM2. The circuit breaker QF3, the contactor KM1, and the contactor KM2 constitute a bypass system.

[0050] As shown in the figure, Figure 3 As shown in the figure, the main power supply is connected to the first connection end of the first control contact of the CB level dual power supply switch integrated circuit breaker QT1, the standby power supply is connected to the first connection end of the second control contact of the CB level dual power supply switch integrated circuit breaker QT2, the second connection end of the first control contact of the CB level dual power supply switch and the second connection end of the second control contact of the CB level dual power supply switch are connected, and then connected to the common end of the important load through the important load contactor such as the circuit breaker QF4 and the circuit breaker QF5. The standby power supply is also connected to the common end of the important load through the circuit breaker QF3, the contact of the contactor KM1, and the contact of the contactor KM2. The circuit breaker QF3, the contactor KM1, and the contactor KM2 constitute a bypass system.

[0051] For the conventional dual power supply switch power distribution system, when a short circuit fault occurs between the dual power supply and the load circuit breaker, the load will be powered off, and the main reasons are as follows: for the PC level dual power supply switch, Figure 2 As shown in the figure, when the fault point occurs between the dual power supply and the load circuit breaker, the fault current will trigger the instantaneous tripping function of the circuit breaker QF1, the main circuit will lose power, and the PC level dual power supply switch will automatically switch to the standby circuit after detecting that the main circuit loses power, but at this time the fault still exists, which will trigger the instantaneous tripping function of the circuit breaker QF2, and the load behind the dual power supply will be powered off and stop working. For the CB level dual power supply switch, Figure 3 As shown in the figure, when the fault point occurs between the dual power supply and the load circuit breaker, the fault current will trigger the instantaneous tripping function of the dual power supply switch, at this time the dual power supply will not switch to the standby circuit, and the load behind the dual power supply will be powered off and stop working. The scheme of the present application provides a solution when the above fault occurs, which can improve the reliability of the dual power supply switch power distribution system.

[0052] In the scheme of the present application, when a short circuit fault occurs between the dual power switch and the rear-end power distribution system in the dual power switch power distribution system, the bypass system can be switched to supply power, the rear-end load can be quickly restored to power supply, and the reliability of the dual power switch power distribution system is improved.

[0053] In some embodiments, the control device of the dual power switch power distribution system in the scheme of the present application further comprises a dual power control device and a reminding device, such as a PC-level dual power control device and a CB-level dual power control device, and an audible and visual alarm device HA. Wherein, the dual power switch system and the bypass system can be automatically controlled by the dual power control device, or manually controlled by an operator. That is, in the case where the dual power control device is not set, it can be manually controlled by an operator.

[0054] Wherein, the dual power control device is used to control the bypass system to connect the standby power supply when a short circuit fault occurs between the main power supply and the standby power supply and the load side circuit breaker, and control the reminding device to issue a reminding message that a short circuit fault occurs between the main power supply and the standby power supply and the load side circuit breaker.

[0055] Wherein, in the case where the bypass system comprises a first contactor and a second contactor, the first contactor, the second contactor, the reminding device, and the circuit breaker of the second level load are all controlled by the dual power control device.

[0056] In the scheme of the present application, the control of the entire dual power switch power distribution system is completed by an automatic control device, and when the short circuit fault (i.e. a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker) occurs, the bypass system can be quickly switched to supply power without human intervention, and the required time is short.

[0057] In some embodiments, the control device of the dual power switch power distribution system in the scheme of the present application further comprises a monitoring device.

[0058] Wherein, the monitoring device is used to monitor the incoming power supply of the dual power supply or the power supply state of the dual power supply.

[0059] The dual-power supply control device is further configured to determine whether a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker according to the incoming power supply of the dual-power supply or the power supply state of the dual-power supply, and control the bypass system to connect the backup power supply and control the reminding device to send a reminding message that the short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0060] In the scheme, the bypass system is added in the dual-power supply switch power distribution system, the dual-power supply switch control device determines whether to switch in the bypass system by monitoring the dual-power supply incoming power supply or the state of the dual-power supply, and the bypass system is put into use when the short circuit fault occurs between the dual-power supply switch and the load-side circuit breaker, thereby supplying power to the important load at the back end, solving the problem that the load at the back end will lose power when the short circuit fault occurs, and improving the reliability of the dual-power supply switch power distribution system, so that the power supply of the load at the back end can be quickly restored when the short circuit fault occurs.

[0061] In some embodiments, when the dual-power supply switch system includes a PC-level dual-power supply switch, the monitoring device includes a first solid-state relay (such as relay KA1) and a second solid-state relay (such as relay KA2); the coil of the first solid-state relay is connected to the main power supply, and the coil of the second solid-state relay is connected to the backup power supply; the normally closed contact of the first solid-state relay and the normally closed contact of the second solid-state relay are connected to the dual-power supply control device; and when the states of the normally closed contact of the first solid-state relay and the normally closed contact of the second solid-state relay change at the same time, it is determined that the short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0062] When the dual-power supply switch system includes a CB-level dual-power supply switch, the monitoring device includes the normally closed contact (such as contact CB) of the CB-level dual-power supply switch; and when the state of the normally closed contact of the CB-level dual-power supply switch changes, it is determined that the short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0063] In the case that the double power supply switch system comprises a first circuit breaker, a second circuit breaker, a PC level double power supply switch, the circuit breaker of the second level load comprises a fourth circuit breaker and a fifth circuit breaker, and the bypass system comprises a third circuit breaker, a first contactor and a second contactor, in the case that it is determined that short circuit faults occur between the main power supply and the standby power supply and between the load side circuit breaker, the bypass system is controlled to connect the standby power supply, comprising: in the case that the third circuit breaker is closed, the first contactor and the second contactor are both controlled to be closed.

[0064] In the case that the double power supply switch system comprises a first circuit breaker, a second circuit breaker, a PC level double power supply switch, the circuit breaker of the second level load comprises a fourth circuit breaker and a fifth circuit breaker, and the bypass system comprises a third circuit breaker, a first contactor and a second contactor, in the case that it is determined that short circuit faults occur between the main power supply and the standby power supply and between the load side circuit breaker, the bypass system is controlled to connect the standby power supply, comprising: in the case that the third circuit breaker is closed, the first contactor and the second contactor are both controlled to be closed.

[0065] The normal power-off sequence of the main power supply and the standby power supply is: the third circuit breaker is controlled to be disconnected first, then the second circuit breaker is controlled to be disconnected, and finally the first circuit breaker is controlled to be disconnected; wherein, the normal power-off is the power-off when no short circuit faults occur between the main power supply and the standby power supply and the load side circuit breaker.

[0066] In the case that short circuit faults occur between the main power supply and the standby power supply and the load side circuit breaker, the power-on sequence after the short circuit faults are eliminated is: in the case that the number of the second level load is two, after the main power supply and the standby power supply can normally supply power, the circuit breakers of the two second level loads corresponding to the second level load are both controlled to be closed first, and then the first contactor and the second contactor are both controlled to be disconnected.

[0067] Figure 4 The structural schematic diagram of an embodiment of the power supply detection and control device. In Figure 2 , Figure 3 and Figure 4In the shown example, QF1, QF2 and QF13 are circuit breakers: devices that can switch power and have short circuit protection. QF4 and QF5 are circuit breakers with added auxiliary trip: devices that have circuit breaker function and open the circuit breaker when the auxiliary trip is energized. QT1 and QT2 are disconnectors: devices that can switch power but do not have short circuit protection. KA1 and KA2 are solid state relays: devices that detect the power state by the state of the relay contacts. HA is an audible and visual alarm: a device that sends an alarm to the operator when the short circuit fault occurs (i.e. when a short circuit fault occurs between the double power supply switch and the load circuit breaker). PC level double power supply control device: controls the bypass system switching and simultaneously opens the important load circuit breaker by detecting the power state feedback. CB level double power supply control device: controls the bypass system switching and simultaneously opens the important load circuit breaker by detecting the double power supply state feedback.

[0068] In the scheme of the present application, the working principles of the PC level double power supply switch and the CB level double power supply switch are different, and the specific embodiments are illustrated as follows. For the PC level double power supply switch distribution system, as shown in Figure 1, the working principle is as follows: Figure 2 and Figure 4As shown, the solid-state relay KA1 and the solid-state relay KA2 are powered by the main power supply and the backup power supply respectively, the common end of the first connection end of the first control contact of the PC-level dual power supply switch is connected with the coil of the solid-state relay KA1 through the circuit breaker QF1; the common end of the first connection end of the second control contact of the PC-level dual power supply switch is connected with the coil of the solid-state relay KA2 through the circuit breaker QF1. The normally closed contacts of the solid-state relay KA1 and the solid-state relay KA2 are connected to the PC-level dual power supply switch system control device, when the main power supply and the backup power supply lose power, the contact state of the solid-state relay KA1 and the solid-state relay KA2 will change, thereby monitoring the power supply state. For example, the solid-state relay has two kinds of contacts, normally open and normally closed, when the relay is powered on, the normally closed is opened and the normally open is closed, and when the power is off, it returns to the normal state. When a fault occurs and the dual power supply loses power, the PC-level dual power supply switch system control device first controls the important equipment circuit breaker QF4 and the important equipment circuit breaker QF5 to open, and then controls the contactor KM1 and the contactor KM2 to be attracted, the important load is powered by the bypass system while the audible and visual alarm is controlled to issue an alarm, reminding the operation and maintenance personnel to quickly handle the fault and restore the normal power supply mode; the circuit breaker OF3 is in the closed state when it is normally used. Since the PC-level dual power supply switch system control device needs to detect the contact state of the solid-state relay KA1 and the solid-state relay KA2 at the same time, when the dual power supply loses power normally, it will not affect the switching of the dual power supply switch. Among them, only when the short circuit fault occurs (i.e. a short circuit fault occurs between the dual power supply switch and the rear-end load circuit breaker), the contact state of the solid-state relay KA1 and the solid-state relay KA2 will change at the same time, and when only one of the solid-state relay KA1 or the solid-state relay KA2 changes, it can be judged that the system upper power supply is normally switched.

[0069] For the CB-level dual power supply switch power distribution system, as Figure 3 and Figure 4As shown, when a fault occurs, the dual power supply will automatically trip and will not switch to the standby power supply, at which time the dual power supply can feed back a fault point to the CB-level dual power supply switch system control device, the CB-level dual power supply switch system control device first controls the important equipment circuit breaker QF4 and the important equipment circuit breaker QF5 to open, then controls the contactor KM1 and the contactor KM2 to be attracted, the important load is powered by the bypass system, and the audible and visual alarm is controlled to issue an alarm, reminding the operation and maintenance personnel to quickly handle the fault and restore the normal power supply mode. Different from the PC-level dual power supply switch, the CB-level dual power supply has the ability to remove the fault, and when the short circuit fault (i.e., a short circuit fault occurs between the dual power supply switch and the rear-end load circuit breaker) occurs, it will switch to the standby power supply, the CB-level dual power supply will be disconnected, and will not switch to the standby power supply, and will feed back the short circuit fault (i.e., a short circuit fault occurs between the dual power supply switch and the rear-end load circuit breaker) to the control device, so the CB-level dual power supply switch does not need to perform circuit power supply detection and judgment of whether it is a normal switch, and at the same time, the same effect as the PC-level dual power supply system can be achieved, i.e., according to the above control sequence, the rear-end load power supply is quickly restored.

[0070] In the dual power supply switch power distribution system using the scheme of the present application, the normal power failure and power supply sequence after fault removal are as follows: the normal power failure sequence is to first open the circuit breaker QF3 of the bypass system, then open the circuit breaker QF2 of the standby power supply, and finally open the circuit breaker QF1 of the main power supply. The normal power supply sequence is to first close the circuit breaker QF1 of the main power supply, then close the circuit breaker QF2 of the standby power supply, and finally close the circuit breaker QF3 of the bypass system. The power supply sequence after fault removal is to first close the circuit breaker QF4 and the circuit breaker QF5 after the dual power supply can normally supply power, and then open the contactor KM1 and the contactor KM2. The application of this method to the dual power supply switch power distribution system can ensure the uninterrupted operation of the load and improve the reliability of the operation of the dual power supply switch power distribution system.

[0071] By using the technical scheme of the present application, for the dual power supply switch power distribution system using the PC-level dual power supply switch and the CB-level dual power supply switch, the bypass system is added, so that when a short circuit fault occurs between the PC-level dual power supply switch and the CB-level dual power supply switch and the rear-end power distribution system, the bypass system can be switched to supply power, and the rear-end load can quickly restore power supply; thereby, by adding the bypass system to the dual power supply switch power distribution system, when a short circuit fault occurs between the dual power supply switch and the rear-end load circuit breaker, the bypass system is used to supply power to the rear-end important load, which can improve the reliability of the dual power supply switch power distribution system and quickly restore power supply to the rear-end equipment when a short circuit fault occurs.

[0072] According to the embodiments of the present application, a dual power supply switch power distribution system corresponding to the control device of the dual power supply switch power distribution system is also provided. The dual power supply switch power distribution system can include the control device of the dual power supply switch power distribution system described above.

[0073] Since the processing and functions realized by the dual power switch power distribution system of the present embodiment are basically corresponding to the embodiments, principles and examples of the device, the descriptions of the present embodiment which are not elaborated can be seen in the related descriptions of the foregoing embodiments, and will not be repeated here.

[0074] According to the embodiments of the present application, an air conditioner corresponding to the control device of the dual power switch power distribution system is also provided. The air conditioner can include the control device of the dual power switch power distribution system described above, or the dual power switch power distribution system described above.

[0075] In some embodiments, the air conditioner includes a machine room air conditioner.

[0076] Since the processing and functions realized by the air conditioner of the present embodiment are basically corresponding to the embodiments, principles and examples of the device, the descriptions of the present embodiment which are not elaborated can be seen in the related descriptions of the foregoing embodiments, and will not be repeated here.

[0077] According to the embodiments of the present application, a control method of a dual power switch power distribution system corresponding to the control device of the dual power switch power distribution system is also provided, as shown in the flowchart of an embodiment of the method of the present application. Figure 5 The control method of the dual power switch power distribution system can include steps S110 to S120.

[0078] At step S110, in the case where the control device of the dual power switch power distribution system further includes a monitoring device and a reminding device, the incoming power supply of the dual power supply or the power supply state of the dual power supply is monitored by the monitoring device.

[0079] At step S120, in the case where the dual power switch power distribution system further includes a dual power control device, whether a short circuit fault occurs between the main power supply and the standby power supply and the load side circuit breaker is determined by the dual power control device according to the incoming power supply of the dual power supply or the power supply state of the dual power supply; and in the case where it is determined that a short circuit fault occurs between the main power supply and the standby power supply and the load side circuit breaker, the bypass system is controlled to connect the standby power supply, and the reminding device is controlled to issue a reminding message that a short circuit fault occurs between the main power supply and the standby power supply and the load side circuit breaker.

[0080] In the scheme of the present application, a bypass system is added in a dual power switch power distribution system, a dual power switch control device determines whether to switch in the bypass system by monitoring the dual power line source or the state of the dual power source, and the bypass system is used when a short circuit fault occurs between the dual power switch and the rear-end load breaker, to supply power to the rear-end important load, solving the problem that the rear-end load will lose all power when the short circuit fault occurs (i.e. a short circuit fault occurs between the dual power switch and the rear-end load breaker), and improving the reliability of the dual power switch power distribution system, so that the rear-end equipment can quickly recover power supply when the short circuit fault occurs.

[0081] Among them, the dual power line source is powered by two routes in normal use, but only one route is used, and the other route is used as a backup; monitoring the dual power line source, i.e. monitoring whether both routes of the line source are powered, for CB-level dual power switch systems, because they have short circuit protection and feedback functions, they do not need to confirm whether the short circuit fault occurs through the line source state.

[0082] For example: for PC-level dual power switch systems: because PC-level dual power switch systems do not have short circuit protection functions, whether the fault occurs needs to be detected by detecting the contact state of solid-state relays KA1 and KA2. Now assume that the normally open contacts of solid-state relays KA1 and KA2 are connected to the PC-level dual power switch system control device, and in the case that both routes of the power source are powered, the PC-level dual power switch system control device detects that the contacts of solid-state relays KA1 and KA2 are closed, and regards this state as normal; when the main circuit is powered off and the standby power source is normal, the dual power switch normally switches to the standby power source, the contact state of solid-state relay KA1 becomes normally open, and the contact of solid-state relay KA2 is still closed, at this time it may be that the main power supply is powered off, and the short circuit fault has not occurred, if the main circuit and the standby circuit are powered off in turn, the contact states of solid-state relays KA1 and KA2 become normally open in turn, at this time it can be determined that the short circuit fault has occurred.

[0083] For CB-level dual power switch systems: with short circuit feedback function, the dual power source itself can determine whether a short circuit occurs, and only needs to monitor whether the dual power source itself trips due to a short circuit.

[0084] In some embodiments, in the case that the dual power switch system comprises a first circuit breaker, a second circuit breaker, a PC level dual power switch, the circuit breaker of the second level load comprises a fourth circuit breaker and a fifth circuit breaker, and the bypass system comprises a third circuit breaker, a first contactor and a second contactor, in the case that it is determined in step S120 that short circuit faults occur between the main power supply and the standby power supply and between the load side circuit breaker, the control of the bypass system to connect the standby power supply comprises: in the case that the third circuit breaker is closed, the control of the first contactor and the second contactor to be closed.

[0085] In the normal power supply sequence of the main power supply and the standby power supply, the first circuit breaker is controlled to be closed first, then the second circuit breaker is controlled to be closed, and finally the third circuit breaker is controlled to be closed. In the normal power supply, the main power supply and the standby power supply are not short-circuit faults between the load side circuit breaker.

[0086] The normal power-off sequence of the main power supply and the standby power supply is that the third circuit breaker is controlled to be disconnected first, then the second circuit breaker is controlled to be disconnected, and finally the first circuit breaker is controlled to be disconnected. In the normal power-off, the main power supply and the standby power supply are not short-circuit faults between the load side circuit breaker.

[0087] In the case that short circuit faults occur between the main power supply and the standby power supply and between the load side circuit breaker, after the short circuit faults are eliminated, the power supply sequence is that in the case that the number of the second level load is two, after the main power supply and the standby power supply can normally supply power, the circuit breakers of the two second level loads corresponding to the second level load are controlled to be closed, and then the first contactor and the second contactor are controlled to be disconnected.

[0088] In the scheme of the present application, the working principles of the PC level dual power switch and the CB level dual power switch are different, and the specific embodiments are illustrated as follows. For the PC level dual power switch power distribution system, as shown in Figure 2 and Figure 4As shown, the solid-state relay KA1 and the solid-state relay KA2 are powered by the main power supply and the backup power supply respectively, the common end of the first connection end of the first control contact of the PC-level dual power supply switch is connected with the coil of the solid-state relay KA1 through the breaker QF1; the common end of the first connection end of the second control contact of the PC-level dual power supply switch is connected with the coil of the solid-state relay KA2 through the breaker QF1. The normally closed contacts of the solid-state relay KA1 and the solid-state relay KA2 are connected to the PC-level dual power supply switch system control device, when the main power supply and the backup power supply lose power, the contact state of the solid-state relay KA1 and the solid-state relay KA2 will change, thereby monitoring the power supply state. When a fault occurs and the dual power supply loses power, the PC-level dual power supply switch system control device first controls the important equipment breaker QF4 and the important equipment breaker QF5 to be tripped, then controls the contactor KM1 and the contactor KM2 to be attracted, the important load is powered by the bypass system and the audible and visual alarm is controlled to issue an alarm, reminding the operation and maintenance personnel to quickly handle the fault and restore the normal power supply mode. Since the PC-level dual power supply switch system control device needs to detect the contact state of the solid-state relay KA1 and the solid-state relay KA2 at the same time, when the dual power supply normally loses power, it will not affect the switching of the dual power supply switch. Among them, only when the short circuit fault (i.e. a short circuit fault occurs between the dual power supply switch and the rear-end load breaker) occurs, the contact state of the solid-state relay KA1 and the solid-state relay KA2 will change at the same time, and when only one of the solid-state relay KA1 or the solid-state relay KA2 changes, it can be judged that the system upper power supply is normally switched.

[0089] For the CB-level dual power supply switch power distribution system, as shown in Figure 3 and Figure 4 When a fault occurs and the dual power supply will automatically trip and will not switch to the backup power supply, at this time the dual power supply can feed back a fault point to the CB-level dual power supply switch system control device, the CB-level dual power supply switch system control device first controls the important equipment breaker QF4 and the important equipment breaker QF5 to be tripped, then controls the contactor KM1 and the contactor KM2 to be attracted, the important load is powered by the bypass system and the audible and visual alarm is controlled to issue an alarm, reminding the operation and maintenance personnel to quickly handle the fault and restore the normal power supply mode. Among them, unlike the PC-level dual power supply switch, the CB-level dual power supply has the ability to remove the fault, when the short circuit fault (i.e. a short circuit fault occurs between the dual power supply switch and the rear-end load breaker) occurs, it will switch to the backup power supply, the CB-level dual power supply will be disconnected and will not switch to the backup power supply, and at the same time it will feed back the short circuit fault (i.e. a short circuit fault occurs between the dual power supply switch and the rear-end load breaker) to the control device, therefore the CB-level dual power supply switch does not need to detect the circuit power supply and whether it is a normal switching, at the same time it can also achieve the same effect as the pre-PC-level dual power supply system, i.e. according to the above control sequence, quickly restore the power supply of the rear-end load.

[0090] In the dual power switch power distribution system using the scheme of the present application, the normal power-off and power-on sequence after troubleshooting are as follows: the normal power-off sequence is: first, disconnect the circuit breaker QF3 of the bypass system, then disconnect the circuit breaker QF2 of the standby power supply, and finally disconnect the circuit breaker QF1 of the main power supply. The normal power-on sequence is: first, close the circuit breaker QF1 of the main power supply, then close the circuit breaker QF2 of the standby power supply, and finally close the circuit breaker QF3 of the bypass system. The power-on sequence after troubleshooting is: after the dual power supply can normally supply power, first, close the circuit breaker QF4 and the circuit breaker QF5, and then disconnect the contactor KM1 and the contactor KM2. The application of this method to the dual power switch power distribution system can ensure the uninterrupted operation of the load and improve the reliability of the operation of the dual power switch power distribution system.

[0091] Since the processing and functions realized by the method of the present embodiment are basically corresponding to the foregoing embodiments, principles and examples of the control device of the dual power switch power distribution system, the description of the present embodiment will not be elaborated on the unexplained parts, and the relevant description in the foregoing embodiments will not be repeated here.

[0092] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0093] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control device for a dual-power switch distribution system, characterized in that, This is applied to a dual-power system supplied by a main power source and a backup power source; the control device for the dual-power switch distribution system includes: a dual-power switch system, a load-side circuit breaker, and a bypass system; wherein, Both the main power supply and the backup power supply are connected to the load-side circuit breaker after passing through the dual power supply switching system; the load-side circuit breaker includes: a circuit breaker for a first-level load and a circuit breaker for a second-level load; the circuit breaker for the first-level load is connected to the first-level load, and the circuit breaker for the second-level load is connected to the second-level load. The backup power supply is also connected to the first connection terminal of the bypass system; the second connection terminal of the bypass system is connected to the common terminal of the circuit breaker of the second-level load and the second-level load. In the absence of a short circuit fault between at least one of the main power supply and the backup power supply and the load-side circuit breaker, the dual power supply switching system controls the switching power supply between the main power supply and the backup power supply. In the event of a short circuit fault between the main power supply and the backup power supply and the load-side circuit breaker, the dual power supply switching system disconnects the main power supply and the backup power supply, and the bypass system controls the backup power supply to supply power to the second-level load through the circuit breaker of the second-level load. It also includes: a dual power supply control device and an alert device; wherein, the dual power supply control device is used to control the bypass system to connect the backup power supply when a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker, and to control the alert device to issue an alert message indicating that a short circuit fault has occurred between both the main power supply and the backup power supply and the load-side circuit breaker; wherein, when the bypass system includes a first contactor and a second contactor, the first contactor, the second contactor, the alert device, and the circuit breaker of the second-level load are all controlled by the dual power supply control device; the alert device includes an audible and visual alarm device; It also includes: a monitoring device; the monitoring device is used to monitor the incoming power supply of the dual power supply or the power status of the dual power supply; the dual power supply control device is further used to determine, based on the incoming power supply of the dual power supply or the power status of the dual power supply, whether a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker; and if it is determined that a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker, control the bypass system to connect the backup power supply, and control the reminder device to issue a reminder message indicating that a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker.

2. The control device for the dual-power switch distribution system according to claim 1, characterized in that, The dual-power switch system includes: a first circuit breaker, a second circuit breaker, and a PC-level dual-power switch; the PC-level dual-power switch has a first control contact and a second control contact; wherein, The main power supply is connected to the load-side circuit breaker after passing through the first control contact of the first circuit breaker and the PC-level dual power switch. The backup power supply is connected to the load-side circuit breaker via the second control contact of the second circuit breaker and the PC-level dual power switch. The common terminal of the backup power supply and the second circuit breaker is connected to the first connection terminal of the bypass system.

3. The control device for the dual-power switch distribution system according to claim 1, characterized in that, The dual-power switch system further includes: a CB-class dual-power switch; the CB-class dual-power switch has a first circuit breaker, a second circuit breaker, a first control contact, and a second control contact; wherein... The main power supply is connected to the load-side circuit breaker after passing through the first circuit breaker of the CB-class dual power switch and the first control contact of the CB-class dual power switch. The backup power supply is connected to the load-side circuit breaker after passing through the second circuit breaker of the CB-level dual power switch and the second control contact of the CB-level dual power switch. The common terminal of the backup power supply and the second circuit breaker of the CB-level dual power switch is connected to the first connection terminal of the bypass system.

4. The control device for a dual-power switchgear distribution system according to any one of claims 1 to 3, characterized in that, The bypass system includes: a third circuit breaker, a first contactor, and a second contactor; wherein, The first connection terminal of the third circuit breaker serves as the first connection terminal of the bypass system and is connected to the backup power supply; the second connection terminal of the third circuit breaker is connected to the first connection terminal of the first contactor and the first connection terminal of the second contactor, respectively. When there are two second-level loads, the second connection terminals of the first contactor and the second contactor serve as the second connection terminals of the bypass system and are respectively connected to the circuit breakers of the corresponding second-level loads in the two second-level loads.

5. The control device for a dual-power switch distribution system according to claim 1, characterized in that, in, In the case where the dual power supply switching system includes a PC-level dual power supply switch, the monitoring device includes: a first solid-state relay and a second solid-state relay; the coil of the first solid-state relay is connected to the main power supply, and the coil of the second solid-state relay is connected to the backup power supply; the normally closed contacts of the first solid-state relay and the second solid-state relay are both connected to the dual power supply control device; when the states of the normally closed contacts of the first solid-state relay and the second solid-state relay change simultaneously, it is determined that a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker. In the case where the dual power supply switch system includes a CB-class dual power supply switch, the monitoring device includes: a normally closed contact of the CB-class dual power supply switch; and, if the state of the normally closed contact of the CB-class dual power supply switch changes, determines that a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker.

6. A dual-power switch distribution system, characterized in that, include: The control device for a dual-power switch distribution system as described in any one of claims 1 to 5.

7. An air conditioner, characterized in that, include: The control device for a dual-power switch distribution system as described in any one of claims 1 to 5, or the dual-power switch distribution system as described in claim 6.

8. A control method for a dual-power switchgear distribution system, employing a control device for a dual-power switchgear distribution system as described in any one of claims 1 to 5, characterized in that, include: In the case where the control device of the dual power supply switch distribution system further includes a monitoring device and an alerting device, the monitoring device monitors the incoming power supply of the dual power supply or the power status of the dual power supply. Based on the incoming power supply or the power status of the dual power supply, determine whether a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker; and if it is determined that a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker, control the bypass system to connect the backup power supply, and control the reminder device to issue a reminder message that a short circuit fault has occurred between the main power supply and the backup power supply and the load-side circuit breaker.

9. The control method for a dual-power switch distribution system according to claim 8, characterized in that, In the case where the dual power supply switching system includes a first circuit breaker, a second circuit breaker, a PC-level dual power supply switch, the circuit breakers for the second-level load include a fourth circuit breaker and a fifth circuit breaker, and the bypass system includes a third circuit breaker, a first contactor, and a second contactor, if a short-circuit fault is determined to have occurred between the main power supply and the backup power supply and the load-side circuit breaker, controlling the bypass system to connect the backup power supply includes: When the third circuit breaker is closed, control both the first contactor and the second contactor to close. The normal power supply sequence of the main power supply and the backup power supply is as follows: first, control the first circuit breaker to close; then, control the second circuit breaker to close; and finally, control the third circuit breaker to close. The normal power outage sequence for the main power supply and the backup power supply is as follows: first, control the third circuit breaker to open, then control the second circuit breaker to open, and finally control the first circuit breaker to open. In the event of a short circuit fault between the main power supply and the backup power supply and the load-side circuit breaker, the power supply sequence after the short circuit fault is cleared is as follows: if there are two second-level loads, after the main power supply and the backup power supply are able to supply power normally, first control the circuit breakers of the two second-level loads corresponding to the second-level loads to close, and then control the first contactor and the second contactor to open.

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