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

Abstract

The invention discloses a dual-power switch power distribution system, a control device and method thereof and an air conditioner, and the device comprises a main power supply and a standby power supply which are connected to a load side circuit breaker after passing through a dual-power switch system; the standby power supply is also connected to the first connecting end of the bypass system; the second connecting end of the bypass system is connected to a circuit breaker of a second-level load and a common end of the second-level load; under the condition that short-circuit faults occur between the main power supply and the load-side circuit breaker and between the standby power supply and the load-side circuit breaker, the dual-power 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 circuit breaker of the second-level load. According to the scheme, the bypass system is added to the dual-power switch power distribution system, the bypass system is used for supplying power to the second-level load, namely the important load when the short-circuit fault occurs between the dual-power switch and the load circuit breaker, and the reliability of the dual-power switch power distribution system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of dual power supplies, and specifically relates to a control device and method for a dual power switch power distribution system, a dual power switch power distribution system and an air conditioner, and more particularly to a device and method for improving the reliability of a dual power switch power distribution system, a dual power switch power distribution system and an air conditioner. Background Art

[0002] According to current data center specifications, the air conditioning system of Class B and above data centers must use dual power supply so that when one power supply is cut off, it can automatically switch to another power supply.

[0003] In the relevant scheme, the mainstream dual power switch is mainly divided into two types: PC (Power Contact) level dual power switch and CB (Circuit Breake) level dual power switch. However, when a short circuit occurs between the PC level dual power switch and the CB level dual power switch and the back-end circuit breaker, the back-end load will be powered off, affecting the normal operation of the back-end load (such as the air conditioning system of the data center).

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The object of the present invention is to provide a dual power switch power distribution system and its control device, method and air conditioner, so as to solve the problem that in a power distribution system using PC and dual power switches and CB dual power switches, when a short circuit fault occurs between the PC-level dual power switch and the CB-level dual power switch to the rear-end circuit breaker, the rear-end load will be powered off. By adding a bypass system to the dual power switch power distribution system, the bypass system is used to supply power to the rear-end important load when a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker, so as to improve the reliability of the dual power switch power distribution system and enable the rear-end equipment to quickly restore power supply when a short circuit fault occurs.

[0006] The present invention provides a control device for a dual power switch distribution system, which is applied to a dual power system powered by a main power supply and a backup power supply; the control device for the dual power switch distribution system comprises: a dual power switch system, a load-side circuit breaker, and a bypass system; wherein the main power supply and the backup power supply are both connected to the load-side circuit breaker after passing through the dual power switch system; the load-side circuit breaker comprises: 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 bypass system. a first connection end of the system; a second connection end of the bypass system is connected to the common end of the circuit breaker of the second-level load and the second-level load; in the case where no short-circuit fault occurs between at least one of the main power supply and the backup power supply and the load-side circuit breaker, the dual power switch system controls the switching power supply between the main power supply and the backup power supply; in the case where a short-circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker, the dual power switch 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.

[0007] In some embodiments, 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 via the first circuit breaker and the first control contact of the PC-level dual power switch; the backup power supply is connected to the load-side circuit breaker via the second circuit breaker and the second control contact of the PC-level dual power switch; the 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 switch system further includes: a CB-level dual power switch; the CB-level 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 via the first circuit breaker of the CB-level dual power switch and the first control contact of the CB-level dual power switch; the backup power supply is connected to the load-side circuit breaker via 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 end of the backup power supply and the second circuit breaker of the CB-level dual power switch is connected to the first connection end of the bypass system.

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

[0010] In some embodiments, it also includes: a dual power supply control device and a reminder 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 control the reminder device to send a reminder message that a short circuit fault occurs 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 reminder device, and the circuit breaker of the second-level load are all controlled by the dual power supply control device.

[0011] In some embodiments: a monitoring device; the monitoring device is used to monitor the incoming power supply of the dual power supply or the power supply status of the dual power supply; the dual power supply control device is also used 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 status of the dual power supply; and when it is determined that a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker, the bypass system is controlled to connect the backup power supply, and the reminder device is controlled to send a reminder 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, where the dual power switch system includes a PC-level dual power 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 contact of the first solid-state relay and the normally closed contact of the second solid-state relay are both connected to the dual power 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 a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker; where the dual power switch system includes a CB-level dual power switch, the monitoring device includes: the normally closed contact of the CB-level dual power switch; when the state of the normally closed contact of the CB-level dual power switch changes, it is determined that a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0013] Matching the above-mentioned device, the present invention provides a dual-power switch power distribution system on another aspect, including: the control device of the dual-power switch power distribution system described above.

[0014] Matching the above-mentioned device, the present invention further provides an air conditioner on the other hand, including: the control device of the dual power switch distribution system mentioned above, or the dual power switch distribution system mentioned above.

[0015] In some implementations, the air conditioner includes: a computer room air conditioner.

[0016] Matching the above-mentioned dual power switch distribution system and air conditioner, the present invention provides a control method for a dual power switch distribution system on another aspect, comprising: when the control device of the dual power switch distribution system also includes a monitoring device and a reminder device, monitoring the incoming power supply of the dual power supply or the power supply status of the dual power supply through the monitoring device; determining whether a short circuit fault occurs between both 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 status of the dual power supply; and when it is determined that a short circuit fault occurs between both 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 reminder device to send a reminder message that a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker.

[0017] In some embodiments, when the dual power switch system includes a first circuit breaker, a second circuit breaker, and a PC-level dual power switch, the circuit breakers of 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, when it is determined that a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker, controlling the bypass system to connect to the backup power supply comprises: when the third circuit breaker is closed, controlling the first contactor and the second contactor to be closed; wherein the normal power supply sequence of the main power supply and the backup power supply is: first controlling the first circuit breaker to be closed, and then controlling Control the second circuit breaker to close, and finally control the third circuit breaker to close; the normal power outage sequence of the main power supply and the backup power supply is: first control the third circuit breaker to open, then control the second circuit breaker to open, and finally control the third circuit breaker to open; 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 power supply sequence after the short circuit fault is eliminated is: when the number of second-level loads is two, after the main power supply and the backup power supply can supply power normally, first control the circuit breakers of the second-level loads corresponding to the two second-level loads to close, and then control the first contactor and the second contactor to open.

[0018] Therefore, the scheme of the present invention, by adding a bypass system to the dual power switch distribution system using PC-level dual power switches and CB-level dual power switches, can switch to the bypass system for power supply when a short circuit fault occurs from the PC-level dual power switch and the CB-level dual power switch to the rear-end distribution system, so that the rear-end load can be quickly restored to power supply; thus, by adding a bypass system to the dual power switch distribution system, the bypass system is used to supply power to the rear-end important load when a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker, which can improve the reliability of the dual power switch distribution system and enable the rear-end equipment to quickly restore power supply when a short circuit fault occurs.

[0019] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of a control device for a dual power switch power distribution system of the present invention;

[0022] Figure 2 A schematic diagram of the structure of an embodiment of a PC-level dual power supply system;

[0023] Figure 3 It is a structural schematic diagram of an embodiment of a CB-level dual power supply system;

[0024] Figure 4 It is a structural schematic diagram of an embodiment of a power supply detection and control device;

[0025] Figure 5 The figure is a flow chart of an embodiment of a control method of a dual power switch power distribution system of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

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

[0028] Among them, the main function of the PC-level dual power switch is to switch between the two power supplies to ensure that when the main power supply fails, the backup power supply can quickly take over the power supply, thereby ensuring the continuous operation of the load; the PC-level dual power switch does not include a circuit breaker function, so it cannot provide overload or short-circuit protection. Usually, the upper power distribution of the PC-level dual power switch will be used in conjunction with a circuit breaker; because it does not include the disconnection and reclosing time of the circuit breaker, the switching speed of the PC-level dual power switch is usually faster, and the switching can be completed within tens of milliseconds to hundreds of milliseconds.

[0029] The CB-class dual power switch integrates the function of a circuit breaker. It can not only switch between two power sources, but also provide overload and short-circuit protection. In the event of a short circuit or overload, it can quickly disconnect the circuit and stop supplying power to the equipment to prevent serious damage to the equipment and lines. Usually, the upper power distribution is used with an isolating switch; due to the disconnection and reclosing time of the circuit breaker, the switching speed is relatively slow, usually between a few hundred milliseconds and a few seconds. Because the CB-class dual power switch itself has short-circuit and overload protection functions, its upper end is usually used with an isolating switch; among them, the isolating switch only has the opening and closing function, and does not have a protection function.

[0030] Short-circuit protection means cutting off the power supply when a short-circuit occurs, rather than ensuring that a short-circuit does not occur. When a short-circuit occurs at the fault point (i.e., between the dual-power switch and the rear-end load circuit breaker), the CB-level dual-power switch will stop supplying power to the load and will no longer switch to the backup power supply. When a short-circuit occurs at the PC-level dual power supply (i.e., a short-circuit occurs between the dual-power switch and the rear-end load circuit breaker), the upper main power circuit breaker will be disconnected first, and then the dual power will switch to the backup power supply. Since the short-circuit still exists, the backup power circuit breaker will also be disconnected, eventually causing a power outage in the entire distribution system.

[0031] Therefore, the scheme of the present invention proposes a control device for a dual power switch distribution system, specifically a device for improving 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 put into use when a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker to supply power to important rear-end loads, thereby improving the reliability of the dual power switch distribution system and enabling the rear-end 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 switch power distribution system is provided. Figure 1 The schematic diagram of the structure of an embodiment of the device of the present invention is shown. The control device of the dual power switch distribution system is applied to a dual power system powered by a main power supply and a backup power supply; the control device of the dual power switch distribution system includes: a dual power switch system, a load side circuit breaker, and a bypass system.

[0033] Wherein, the main power supply and the backup power supply are both connected to the load-side circuit breaker after passing through the dual power switch 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 such as a normal level, and the second level is such as an important 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 end of the bypass system; the second connection end of the bypass system is connected to the circuit breaker of the second level load and the common end of the second level load.

[0035] In the case that no short circuit fault occurs between at least one of the main power supply and the backup power supply and the load-side circuit breaker, the dual power switch system controls the switching power supply between the main power supply and the backup power supply.

[0036] In the event 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 switch 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.

[0037] The solution of the present invention adopts the measure of adding a bypass system to the dual power switch power distribution system. The bypass system is put into use when a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker to supply power to the important rear-end loads, thereby solving the problem that all rear-end loads will lose power 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 reliability of the dual power switch power distribution system can be improved, and the rear-end equipment can quickly restore power supply when the short circuit fault occurs.

[0038] Under normal circumstances, if the short-circuit fault (i.e., a short-circuit fault occurs between the dual power switch and the rear-end load circuit breaker) occurs, it is necessary to manually eliminate the fault before restoring power supply. It takes a long time to restore power supply, and all operations must be performed manually, without automatic control function. However, the solution of the present invention only needs to use a simple control device to first cut off the fault point and restore the power supply of the rear-end equipment, and then manually eliminate the fault and restore to the normal power supply mode. The process does not require human participation, and only needs to be restored to the normal power supply mode after subsequent manual elimination of the fault. Overall, it solves the problem of long power supply restoration time after a fault occurs in related solutions, and can improve the power supply reliability and continuity of the dual power switch 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 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 switch. The common end of the backup power supply and the second circuit breaker is connected to the first connection end of the bypass system.

[0041] Figure 2 FIG. 1 is a schematic diagram of a PC-level dual power supply system according to an embodiment of the present invention. Figure 2In the example shown, the main power supply is connected to the first connection end of the first control contact in the PC-level dual power switch through the circuit breaker QF1, and the backup power supply is connected to the first connection end of the second control contact in the PC-level dual power switch through the circuit breaker QF2. After the second connection end of the first control contact in the PC-level dual power switch and the second connection end of the second control contact in the PC-level dual power switch are connected, they are connected to the ordinary load through the ordinary load contactor, and are connected to the important load through the important load contactor such as circuit breaker QF4 and circuit breaker QF5.

[0042] In the scheme of the present invention, a bypass system is installed for the PC-level dual power switch. When the short-circuit fault (i.e., a short-circuit fault occurs between the dual power switch and the rear-end load circuit breaker) causes all the circuit breakers at the upper end of the PC-level dual power switch to trip, the control device starts the bypass system to supply power to the important loads at the rear end. At the same time, the control device will issue a fault alarm to remind the operation and maintenance personnel to handle the relevant faults so as to quickly restore normal power supply, thereby improving the power supply reliability. The entire process is completed by an independent power supply control device. That is to say, in the scheme of the present invention, a bypass system is installed for the PC-level dual power switch. When the short-circuit fault (i.e., a short-circuit fault occurs between the dual power switch and the rear-end load circuit breaker) causes all the circuit breakers at the upper end of the PC-level dual power switch to trip, the bypass system is started to supply power to the important loads at the rear end, thereby improving the power supply reliability. The entire process is completed by an independent power supply control device.

[0043] In some embodiments, the dual power switch system further includes: a CB-level dual power switch; the CB-level dual power 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] Wherein, the main power supply is connected to the load-side circuit breaker through the first circuit breaker of the CB-level dual power switch and the first control contact of the CB-level dual power switch. The backup power supply is connected to the load-side circuit breaker 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 end of the backup power supply and the second circuit breaker of the CB-level dual power switch is connected to the first connection end of the bypass system.

[0045] Figure 3 FIG. 1 is a schematic diagram of a structure of an embodiment of a CB-class dual power supply system. Figure 3In the example shown, the main power supply is connected to the first connection end of the first control contact in the CB-class dual power switch through the circuit breaker QT1, and the backup power supply is connected to the first connection end of the second control contact in the CB-class dual power switch through the circuit breaker QT2. After the second connection end of the first control contact in the CB-class dual power switch and the second connection end of the second control contact in the CB-class dual power switch are connected, they are 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. Among them, the circuit breakers QT1 and QT2 have the same function as the circuit breakers QF1 and QF2, both of which are used to stop and supply power to the dual power switch, but the circuit breakers QT1 and QT2 do not have a protection function.

[0046] In the scheme of the present invention, a bypass system is installed for the CB-level dual power switch. When the short-circuit fault (i.e., a short-circuit fault occurs between the dual power switch and the rear-end load circuit breaker) causes the CB-level dual power switch to trip, the CB-level dual power switch will provide a short-circuit trip signal to the control device, and the control device will switch the power supply to the bypass system to supply power to the important load at the rear end. At the same time, the control device will issue a fault alarm to remind the operation and maintenance personnel to handle the relevant faults so as to quickly restore normal power supply. This invention can improve the reliability of power supply, and the entire process is completed by an independent power supply control device. In other words, a bypass system is installed for the CB-level dual power switch, and the CB-level dual power switch provides a short-circuit trip signal to the control device, and the control device switches the power supply to the bypass system to improve the reliability of power supply.

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

[0048] The first connection end of the third circuit breaker, as the first connection end of the bypass system, is connected to the backup power supply; 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. When 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, as the second connection end of the bypass system, are respectively connected to the circuit breakers of the corresponding second-level loads in the two second-level loads.

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

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

[0051] For conventional dual power switch distribution system, when a short circuit occurs between the dual power supply and the load circuit breaker, the load will be cut off. The main reasons are as follows: For PC-level dual power switch, if 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, and the main circuit will lose power. After detecting the main circuit power failure, the PC-level dual power switch will automatically switch to the backup circuit, but the fault still exists at this time, which will trigger the instantaneous tripping function of the circuit breaker QF2. All loads behind the dual power supply will lose power and stop working. For the CB-level dual power switch, if Figure 3 As shown, when the fault point occurs between the dual power supply and the load circuit breaker, the fault current will trigger the dual power switch instantaneous tripping function. At this time, the dual power supply will not switch to the backup circuit, and the load behind the dual power supply will all lose power and stop working. The solution of the present invention provides a solution when the above fault occurs, which can improve the reliability of the dual power switch power distribution system.

[0052] In the scheme of the present invention, in a dual power switch power distribution system, when a short circuit fault occurs from the dual power switch to the rear-end power distribution system, the power supply can be switched to the bypass system, and the rear-end load can quickly resume power supply, thereby improving the reliability of the dual power switch power distribution system.

[0053] In some embodiments, the control device of the dual power switch power distribution system described in the solution of the present invention further includes: a dual power control device and a reminder device, the dual power control device is such as a PC-level dual power control device and a CB-level dual power control device, and the reminder device is such as an audible and visual alarm device HA. 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 to say, when the dual power control device is not provided, it can be manually controlled by an operator.

[0054] Among them, 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 control the reminder device to send a reminder message that a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker.

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

[0056] In the solution of the present invention, the control of the entire dual power switch distribution system is completed by an automatic control device. 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), it can quickly switch to the bypass system for power supply without human intervention, and the time required is short.

[0057] In some embodiments, the control device of the dual power switch distribution system described in the solution of the present invention further includes: a monitoring device.

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

[0059] The dual power supply control device is also used to determine whether a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker based on the incoming power supply of the dual power supply or the power supply status of the dual power supply; and when it is determined that a short circuit fault occurs between both 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 occurs between both the main power supply and the backup power supply and the load-side circuit breaker.

[0060] In the scheme of the present invention, a bypass system is added to the dual power switch power distribution system. The dual power switch control device determines whether to switch into the bypass system by monitoring the dual power incoming power supply or the dual power supply itself. When a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker, the bypass system is put into use to supply power to important rear-end loads. This solves the problem that all rear-end loads will lose power 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), improves the reliability of the dual power switch power distribution system, and enables the rear-end equipment to quickly restore power supply when the short circuit fault occurs.

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

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

[0063] Among them, when the dual power switch system includes a first circuit breaker, a second circuit breaker, a PC-level dual power switch, the circuit breakers of 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, when it is determined that a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker, the bypass system is controlled to connect the backup power supply, including: when the third circuit breaker is closed, controlling the first contactor and the second contactor to be closed.

[0064] Among them, the normal power supply sequence of the main power supply and the backup power supply is: 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; wherein, normal power supply refers to power supply when no short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0065] The normal power outage sequence of the main power supply and the backup power supply is: first control the third circuit breaker to disconnect, then control the second circuit breaker to disconnect, and finally control the third circuit breaker to disconnect; wherein, a normal power outage refers to a power outage when no short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

[0066] In the case that a short circuit fault occurs between both 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 eliminated is as follows: when the number of second-level loads is two, after both the main power supply and the backup power supply are able to supply power normally, first control the circuit breakers of the second-level loads corresponding to the two second-level loads to be closed, and then control the first contactor and the second contactor to be disconnected.

[0067] Figure 4 FIG. 1 is a schematic diagram of the structure of an embodiment of a power supply detection and control device. Figure 2 , Figure 3 and Figure 4In the example shown, QF1, QF2 and QF13 are circuit breakers: devices that can switch power on and off and have short-circuit protection function. QF4 and QF5 are circuit breakers equipped with shunt releases: they have circuit breaker function, and when the shunt release is energized, the circuit breaker is opened. QT1 and QT2 are disconnectors: devices that can switch power on and off, but do not have short-circuit protection function. KA1 and KA2 are solid-state relays: the power status is detected by the contact status of the relay. HA is an audible and visual alarm device: 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 control device issues an alarm to remind the operation and maintenance personnel to handle the relevant fault. PC-level dual power control device: by detecting the power status feedback, the bypass system is controlled to switch on and off, and the important load circuit breaker is disconnected at the same time. CB-level dual power control device: by detecting the dual power status feedback, the bypass system is controlled to switch on and off, and the important load circuit breaker is disconnected at the same time.

[0068] In the solution of the present invention, the PC-level dual power switch and the CB-level dual power switch have different working paths, and the specific implementation methods are respectively described as follows. For the PC-level dual power switch power distribution system, 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 circuit breaker QF1 and the first control contact in the PC-level dual power switch is connected to the coil of the solid-state relay KA1; the common end of the first connection end of the circuit breaker QF1 and the second control contact in the PC-level dual power switch is connected to the coil of the solid-state relay KA2. The normally closed contacts of the solid-state relay KA1 and the solid-state relay KA2 are connected to the PC-level dual power switch system control device. When the main power supply and the backup power supply are powered off, the contact states 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 types of contacts, normally open and normally closed. When the relay is powered on, the normally closed is disconnected and the normally open is closed. When the power is off, it returns to normal. When a fault occurs and the dual power supply loses power, the PC-level dual power 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 close, and the bypass system supplies power to the important load while controlling the sound and light alarm to sound 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 used normally. Because the PC-level dual power 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-end power supply loses power normally, it will not affect the switching of the dual power switch. Among them, only when the short-circuit fault occurs (that is, a short-circuit fault occurs between the dual power 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. When only one contact of the solid-state relay KA1 or the solid-state relay KA2 changes, it can be judged that the upper-end power distribution of the system is switched normally.

[0069] For CB-class dual power switch distribution system, if Figure 3 and Figure 4As shown, when a fault occurs, the dual power supply will automatically trip and will not switch to the backup power supply. At this time, the dual power supply can feedback 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, and then controls the contactor KM1 and contactor KM2 to attract. The bypass system supplies power to the important load and controls the sound and light alarm to sound 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 switch, the CB-level dual power supply has the ability to cut off faults. 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), it will switch to the backup power supply. The CB-level dual power supply will disconnect the power supply and will not switch to the backup power supply. At the same time, the short-circuit fault (i.e., a short-circuit fault occurs between the dual power switch and the rear-end load circuit breaker) will be fed back to the control device. Therefore, the CB-level dual power switch does not need to perform circuit power supply detection and judgment on whether it is a normal switch. At the same time, it can also achieve the same effect as the pre-PC-level dual power supply system, that is, according to the above-mentioned control sequence, quickly restore the power supply to the rear-end load.

[0070] When using the dual power switch power distribution system of the solution of the present invention, the normal power outage and the power supply sequence after troubleshooting are as follows: Normal power outage sequence: first disconnect the circuit breaker QF3 of the bypass system, then disconnect the circuit breaker QF2 of the backup power supply, and finally disconnect the circuit breaker QF1 of the main power supply. Normal power supply sequence: first close the circuit breaker QF1 of the main power supply, then close the circuit breaker QF2 of the backup power supply, and finally close the circuit breaker QF3 of the bypass system. Power supply sequence after troubleshooting: after the dual power supplies can supply power normally, first close the circuit breakers QF4 and QF5, and then disconnect the contactors KM1 and KM2. Applying 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.

[0071] By adopting the technical solution of the present invention, a bypass system is added to a dual power switch distribution system using a PC-level dual power switch and a CB-level dual power switch. When a short circuit fault occurs from the PC-level dual power switch and the CB-level dual power switch to the rear-end distribution system, the power supply can be switched to the bypass system, so that the rear-end load can be quickly restored to power. Therefore, by adding a bypass system to the dual power switch distribution system, when a short circuit fault occurs 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 distribution system and enable the rear-end equipment to quickly restore power supply when a short circuit fault occurs.

[0072] According to an embodiment of the present invention, a dual power switch power distribution system corresponding to the control device of the dual power switch power distribution system is also provided. The dual power switch power distribution system may include: the control device of the dual power switch power distribution system described above.

[0073] Since the processing and functions implemented by the dual power switch distribution system of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0074] According to an embodiment of the present invention, an air conditioner corresponding to a control device of a dual power switch power distribution system is also provided. The air conditioner may 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 implementations, the air conditioner includes: a computer room air conditioner.

[0076] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0077] According to an embodiment of the present invention, a control method for a dual power switch power distribution system corresponding to the control device of the dual power switch power distribution system is also provided. Figure 5 The control method of the dual power switch power distribution system may include: step S110 to step S120.

[0078] At step S110, when the control device of the dual power switch distribution system further includes a monitoring device and a reminder device, the incoming power of the dual power source or the power status of the dual power source is monitored by the monitoring device.

[0079] At step S120, when the dual-power switch distribution system also includes a dual-power control device, the dual-power control device determines whether a short-circuit fault occurs between both 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 status of the dual power supply; and when it is determined that a short-circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker, the bypass system is controlled to connect the backup power supply, and the reminder device is controlled to send a reminder message that a short-circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker.

[0080] In the scheme of the present invention, a bypass system is added to the dual power switch power distribution system. The dual power switch control device determines whether to switch into the bypass system by monitoring the dual power incoming power supply or the dual power supply itself. When a short circuit fault occurs between the dual power switch and the rear-end load circuit breaker, the bypass system is put into use to supply power to important rear-end loads. This solves the problem that all rear-end loads will lose power 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), improves the reliability of the dual power switch power distribution system, and enables the rear-end equipment to quickly restore power supply when the short circuit fault occurs.

[0081] Among them, when the dual power supply is in normal use, both lines are powered, but only one line is used and the other is used as a backup; monitoring the dual power supply line means monitoring whether both lines of the power supply are powered. For the CB-level dual power supply switch system, because it has short-circuit protection and feedback functions, there is no need to confirm whether the short-circuit fault occurs through the incoming power supply status.

[0082] For example: for the PC-level dual power switch system: because the PC-level dual power switch system itself does not have a short-circuit protection function, whether the fault occurs needs to be detected by detecting the contact state of the solid-state relay KA1 and the solid-state relay KA2. Now assume that the normally open contacts of the solid-state relay KA1 and the solid-state relay KA2 are connected to the PC-level dual power switch system control device. When both power supplies are powered, the PC-level dual power switch system control device detects that the contacts of the solid-state relay KA1 and the solid-state relay KA2 are closed, and the state at this time is regarded as the normal state; when the main circuit is powered off and the backup power supply is normal, the dual power switch switches to the backup power supply normally, the contact state of the solid-state relay KA1 becomes normally open, and the contact of the solid-state relay KA2 is still closed. At this time, it may be that the main power supply has lost power and the short-circuit fault has not occurred. If the main circuit and the backup circuit lose power successively, the contact states of the solid-state relay KA1 and the solid-state relay KA2 successively become normally open, and it can be determined that the short-circuit fault has occurred.

[0083] For the CB-level dual-power switch system: it has a short-circuit feedback function, and the dual power supply itself can determine whether a short circuit occurs. It only needs to monitor whether the dual power supply itself has a short-circuit trip.

[0084] In some embodiments, when the dual power switch system includes a first circuit breaker, a second circuit breaker, a PC-level dual power switch, the circuit breakers of 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, in step S120, when it is determined that a short circuit fault occurs 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, controlling both the first contactor and the second contactor to be closed.

[0085] The normal power supply sequence of the main power supply and the backup power supply is: 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. Normal power supply refers to power supply when there is no short circuit fault between the main power supply and the backup power supply and the load-side circuit breaker.

[0086] The normal power outage sequence of the main power supply and the backup power supply is: first control the third circuit breaker to be disconnected, then control the second circuit breaker to be disconnected, and finally control the third circuit breaker to be disconnected. Among them, the normal power outage is the power outage when there is no short circuit fault between the main power supply and the backup power supply and the load side circuit breaker.

[0087] In the case that a short circuit fault occurs between both 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 eliminated is as follows: when the number of second-level loads is two, after both the main power supply and the backup power supply are able to supply power normally, first control the circuit breakers of the second-level loads corresponding to the two second-level loads to be closed, and then control the first contactor and the second contactor to be disconnected.

[0088] In the solution of the present invention, the PC-level dual power switch and the CB-level dual power switch have different working paths, and the specific implementation methods are respectively described as follows. For the PC-level dual power switch power distribution system, 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 circuit breaker QF1 and the first control contact in the PC-level dual power switch is connected to the coil of the solid-state relay KA1; the common end of the first connection end of the circuit breaker QF1 and the second control contact in the PC-level dual power switch is connected to the coil of the solid-state relay KA2. The normally closed contacts of the solid-state relay KA1 and the solid-state relay KA2 are connected to the PC-level dual power switch system control device. When the main power supply and the backup power supply are lost, the contact states 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 is lost, the PC-level dual power 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 close, and the bypass system supplies power to the important load while controlling the sound and light alarm to sound an alarm, reminding the operation and maintenance personnel to quickly handle the fault and restore the normal power supply mode. Because the PC-level dual power switch system control device needs to detect the contact states of the solid-state relay KA1 and the solid-state relay KA2 at the same time, the switching of the dual power switch will not be affected when the dual-end power supply is normally de-energized. Among them, only 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 contact states of the solid-state relay KA1 and the solid-state relay KA2 will change at the same time. When only one contact of the solid-state relay KA1 or the solid-state relay KA2 changes, it can be determined that the upper-end power distribution of the system is switched normally.

[0089] For CB-class dual power switch distribution system, if Figure 3 and Figure 4 As shown, when a fault occurs, the dual power supply will automatically trip and will not switch to the backup power supply. At this time, the dual power supply can feedback 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, and then controls the contactor KM1 and contactor KM2 to attract. The bypass system supplies power to the important load and controls the sound and light alarm to sound 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 switch, the CB-level dual power supply has the ability to cut off faults. 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), it will switch to the backup power supply. The CB-level dual power supply will disconnect the power supply and will not switch to the backup power supply. At the same time, the short-circuit fault (i.e., a short-circuit fault occurs between the dual power switch and the rear-end load circuit breaker) will be fed back to the control device. Therefore, the CB-level dual power switch does not need to perform circuit power supply detection and judgment on whether it is a normal switch. At the same time, it can also achieve the same effect as the pre-PC-level dual power supply system, that is, according to the above-mentioned control sequence, quickly restore the power supply to the rear-end load.

[0090] When using the dual power switch power distribution system of the solution of the present invention, the normal power outage and the power supply sequence after troubleshooting are as follows: Normal power outage sequence: first disconnect the circuit breaker QF3 of the bypass system, then disconnect the circuit breaker QF2 of the backup power supply, and finally disconnect the circuit breaker QF1 of the main power supply. Normal power supply sequence: first close the circuit breaker QF1 of the main power supply, then close the circuit breaker QF2 of the backup power supply, and finally close the circuit breaker QF3 of the bypass system. Power supply sequence after troubleshooting: after the dual power supplies can supply power normally, first close the circuit breakers QF4 and QF5, and then disconnect the contactors KM1 and KM2. Applying 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 implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the control device of the aforementioned dual-power switch distribution system, for the details not exhaustive in the description of this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0092] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0093] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control device for a dual power switch power distribution system, characterized in that: Applicable to a dual power system powered by a main power supply and a backup power supply; the control device of the dual power switch distribution system includes: a dual power 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 after passing through the dual power switch 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 end of the bypass system; the second connection end of the bypass system is connected to the circuit breaker of the second level load and the common end of the second level load; In the case that there is no 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 switch system controls the switching power supply between the main power supply and the backup power supply; In the event 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 switch 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.

2. The control device of the dual power switch distribution system according to claim 1, characterized in that: The dual power switch system comprises: 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 through the first circuit breaker and the first control contact of the PC-level dual power 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 switch; The common end of the backup power supply and the second circuit breaker is connected to the first connection end of the bypass system.

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

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

5. The control device of the dual power switch distribution system according to any one of claims 1 to 4, characterized in that: Also includes: Dual power supply control device and reminder 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 control the reminder device to send a reminder message that a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker; Wherein, in the case where the bypass system includes a first contactor and a second contactor, the first contactor, the second contactor, the reminder device, and the circuit breaker of the second level load are all controlled by the dual power supply control device.

6. The control device of the dual power switch distribution system according to claim 5, characterized in that: Also includes: Monitoring devices; The monitoring device is used to monitor the incoming power supply of the dual power supply or the power supply status of the dual power supply; The dual power supply control device is also used to determine whether a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker based on the incoming power supply of the dual power supply or the power supply status of the dual power supply; and when it is determined that a short circuit fault occurs between both 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 occurs between both the main power supply and the backup power supply and the load-side circuit breaker.

7. The control device of the dual power switch power distribution system according to claim 6, characterized in that: in, In the case where the dual power switch system includes a PC-level dual power 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 contact of the first solid-state relay and the normally closed contact of the second solid-state relay are both connected to the dual power 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 a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker; In the case where the dual power switch system includes a CB-level dual power switch, the monitoring device includes: a normally closed contact of the CB-level dual power switch; when the state of the normally closed contact of the CB-level dual power switch changes, it is determined that a short circuit fault occurs between the main power supply and the backup power supply and the load-side circuit breaker.

8. A dual power switch distribution system, characterized in that: include: A control device for a dual power switch power distribution system as claimed in any one of claims 1 to 7.

9. An air conditioner, characterized in that: include: A control device for a dual power switch power distribution system as claimed in any one of claims 1 to 7, or a dual power switch power distribution system as claimed in claim 8.

10. A control method for a dual power switch power distribution system corresponding to the control device for the dual power switch power distribution system according to any one of claims 1 to 7, characterized in that: include: In the case where the control device of the dual power switch power distribution system further includes a monitoring device and a reminder device, the incoming power supply of the dual power supply or the power supply status of the dual power supply is monitored by the monitoring device; According to the incoming power supply of the dual power supply or the power supply status of the dual power supply, determine whether a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker; and when it is determined that a short circuit fault occurs between both 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 send a reminder message that a short circuit fault occurs between both the main power supply and the backup power supply and the load-side circuit breaker.

11. The control method of the dual power switch power distribution system according to claim 10, characterized in that: In the case where the dual power switch system includes a first circuit breaker, a second circuit breaker, and a PC-level dual power switch, the circuit breakers of 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, in the case where it is determined that a short circuit fault occurs 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, controlling both the first contactor and the second contactor to be closed; The normal power supply sequence of the main power supply and the backup power supply is: 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 of the main power supply and the backup power supply is: first control the third circuit breaker to be disconnected, then control the second circuit breaker to be disconnected, and finally control the third circuit breaker to be disconnected; In the case that a short circuit fault occurs between both 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 eliminated is as follows: when the number of second-level loads is two, after both the main power supply and the backup power supply are able to supply power normally, first control the circuit breakers of the second-level loads corresponding to the two second-level loads to be closed, and then control the first contactor and the second contactor to be disconnected.

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