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

Abstract

The utility model discloses a dual-power switch power distribution system and a control device and an air conditioner thereof, 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 utility model belongs to dual power supply technical field, concretely relates to a control device of dual power supply switch power distribution system, dual power supply switch power distribution system and air conditioner, and especially relates to a device that improves reliability of dual power supply switch power distribution system, dual power supply switch power distribution system and air conditioner. BACKGROUND

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

[0003] In related schemes, mainstream dual power supply switches are mainly divided into two kinds: PC (Power Contact) level dual power supply switch and CB (Circuit Breake) level dual power supply switch. However, when short circuit fault occurs between PC level dual power supply switch and 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 data center).

[0004] The above content is only used to assist in understanding the technical scheme of the utility model and does not represent that the above content is prior art. Utility model content

[0005] The utility model aims at providing a dual power supply switch power distribution system, its control device and air conditioner to solve the problem that when PC and dual power supply switch and CB dual power supply switch are used in the power distribution system, short circuit fault occurs between PC level dual power supply switch and CB level dual power supply switch and the rear circuit breaker, which leads to power off of the rear load. 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 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 make the rear equipment quickly recover power supply when short circuit fault occurs.

[0006] The utility model provides a kind of control device of dual power supply switch distribution system, it is applied to the dual power supply system powered by main power supply and standby power supply;The control device of dual power supply switch distribution system, comprising: dual power supply switch system, load side circuit breaker and bypass system;Wherein, the main power supply and the standby power supply, after being connected to the load side circuit breaker by the dual power supply switch system, the load side circuit breaker, including: the circuit breaker of first level load and the circuit breaker of second level load;The circuit breaker of first level load is connected with first level load, and the circuit breaker of second level load is connected with second level load;The standby 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 common end of the circuit breaker of second level load and second level load;In the case where short-circuit fault does not occur between at least one of the main power supply and the standby power supply and the load side circuit breaker, the switching power supply between the main power supply and the standby power supply is controlled by the dual power supply switch system;In the case where short-circuit fault occurs 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 supply switch system, and the standby power supply is controlled to supply power to second level load through the circuit breaker of second level load by the bypass system.

[0007] In some embodiments, the dual power supply switch system includes 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 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 supply switch; and the common end of the standby 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 includes 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 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; and 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.

[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, in the case that 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 with the main power supply, and a coil of the second solid state relay is connected with 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 with the dual power control device; in the case that 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 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] The utility model discloses a dual power switch distribution system matched with the above-mentioned device, which comprises the control device of the dual power switch distribution system.

[0014] The utility model discloses an air conditioner matched with the above-mentioned device, which comprises the control device of the dual power switch distribution system or the dual power switch distribution system.

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

[0016] Therefore, the scheme of the utility model can switch to the bypass system for power supply when short circuit faults occur between the PC level dual power switch and the CB level dual power switch and the rear-end distribution system, so that the rear-end load can be quickly restored for power supply; thus, by adding the bypass system to the dual power switch distribution system, the bypass system can be used to supply power to the rear-end important load when short circuit faults occur between the dual power switch and the rear-end load circuit breaker, so that the reliability of the dual power switch distribution system can be improved, and the rear-end equipment can be quickly restored for power supply when short circuit faults occur.

[0017] Other features and advantages of the utility model will be described in the following description, and some of them will become apparent from the description, or be understood by implementing the utility model.

[0018] The technical scheme of the utility model will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1An embodiment of the control device of the dual power switch power distribution system is shown in the structural schematic view of the utility model.

[0020] Figure 2 An embodiment of the PC level dual power system is shown in the structural schematic view.

[0021] Figure 3 An embodiment of the CB level dual power system is shown in the structural schematic view.

[0022] Figure 4 An embodiment of the power detection and control device is shown in the structural schematic view.

[0023] Figure 5 An embodiment of the control method of the dual power switch power distribution system is shown in the flowchart. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model technical scheme will be described clearly and completely below by combining the utility model specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0025] It is considered that when short circuit fault occurs between the PC level dual power switch and the CB level dual power switch and the rear end circuit breaker in the power distribution system adopting PC and dual power switch and CB dual power switch, the rear end load will be powered off.

[0026] Among them, the main function of PC level dual power switch is to switch between two power sources to ensure that the standby power source can quickly replace power supply when the main power source fails, so as to ensure the continuous operation of the load; PC level dual power switch does not contain circuit breaker function, so it cannot provide overload or short circuit protection, and PC level dual power switch is usually used with circuit breaker on the upper end power distribution; due to the disconnection and reclosing time of circuit breaker, the switching speed of PC level dual power switch is usually fast, which can be completed within tens of milliseconds to hundreds of milliseconds.

[0027] The CB-level dual power supply switch integrates the function of a circuit breaker, can not only switch between two power supplies, but also provide overload and short circuit protection, can quickly disconnect the circuit and stop power supply to the equipment when a short circuit or overload occurs, and prevent the equipment and line from being severely damaged. The upper end is usually used with a disconnecting 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-level dual power supply switch itself has short circuit and overload protection functions, the upper end is usually used with a disconnecting switch. The disconnecting switch only has the functions of switching on and off, and does not have the protection function.

[0028] The short circuit protection refers to cutting off the power supply when a short circuit fault occurs, rather than ensuring that the short circuit does not occur. When a short circuit occurs at the fault point (i.e. between the dual power supply switch and the rear end load circuit breaker), the CB-level dual power supply switch will stop supplying power to the load and will no longer switch to the standby power supply. When the PC-level dual power supply occurs the short circuit fault (i.e. a short circuit fault occurs between the dual power supply switch and the rear end load circuit breaker), the upper end main power supply circuit breaker is first disconnected, and then the dual power supply switches to the standby power supply. Since the short circuit still exists, the standby power supply circuit breaker is also disconnected, ultimately resulting in the entire power distribution system being powered off.

[0029] Therefore, the scheme of the utility model provides a control device of a dual power supply switch power distribution system, specifically a device for improving the reliability of a dual power supply switch power distribution system, by adding a bypass system for PC-level dual power supply switches and CB-level dual power supply switches. The bypass system is used when a short circuit fault occurs between the dual power supply switch and the rear end load circuit breaker, and supplies power to the rear end important load. The reliability of the dual power supply switch power distribution system can be improved, and the rear end equipment can quickly recover power supply when the short circuit fault occurs.

[0030] According to the embodiment of the utility model, a control device of a dual power supply switch power distribution system is provided. Referring to Figure 1 The control device of the dual power supply switch power distribution system is applied to a dual power supply system powered by a main power supply and a standby 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.

[0031] The main power supply and the standby 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 for a first level load and a circuit breaker for a second level load. The first level load is a common level load, and the second level load is an important 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.

[0032] The standby power supply is also connected to the first connection end of the bypass system; and the 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.

[0033] In the case that a short circuit fault does not occur between at least one of the main power supply and the standby power supply and the load side circuit breaker, switching power supply between the main power supply and the standby power supply is controlled by the dual power supply switch system.

[0034] 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 main power supply and the standby power supply are disconnected by the dual power supply switch system, and the standby power supply supplies power to the second level load through the circuit breaker of the second level load by the bypass system.

[0035] The scheme of the utility model takes the measure of adding a bypass system to the dual power supply switch power distribution system, the bypass system is put into use when a short circuit fault occurs between the dual power supply switch and the load circuit breaker at the rear end, supplies power to the important load at the rear end, solves the problem that the load at the rear end will lose power completely when the short circuit fault occurs (i.e. a short circuit fault occurs between the dual power supply switch and the load circuit breaker at the rear end), can improve the reliability of the dual power supply switch power distribution system, and the rear end equipment can be quickly restored to power supply when the short circuit fault occurs.

[0036] Under normal circumstances, when the short circuit fault occurs (i.e. a short circuit fault occurs between the dual power supply switch and the load circuit breaker at the rear end), the power supply needs to be restored after the fault is manually eliminated, the time required for restoring the power supply is long, and all operations need to be manually performed, and the automatic control function is not available. The scheme of the utility model only needs to cut off the fault point and restore the power supply to the rear end equipment by a simple control device, and then restore the conventional power supply mode after the fault is manually eliminated, the process does not need human intervention, and only needs to restore the normal power supply mode after the fault is manually eliminated, the problem of long time for restoring the power supply after the fault occurs in the related scheme is solved in the whole, and the power supply reliability and continuity of the dual power supply switch power distribution system can be improved.

[0037] In some embodiments, the dual power supply switch system comprises a first circuit breaker (such as circuit breaker QF1), a second circuit breaker (such as circuit breaker QF2), 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.

[0038] The main power supply is connected to the load side breaker through the first breaker and the first control contact of the PC level dual power supply switch.

[0039] Figure 2 The structure schematic diagram of an embodiment of the PC level dual power supply system is shown. Figure 2 In 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 breaker QF1, the backup power supply is connected to the first connection end of the second control contact of the PC level dual power supply switch through the 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 breaker QF4 and the breaker QF5.

[0040] In the scheme of the utility model, the bypass system is installed for the PC level dual power supply switch, when the short circuit fault (that is, the short circuit fault between the dual power supply switch and the rear end load breaker) causes all the 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, meanwhile, the control device sends out a fault alarm to remind the operation and maintenance personnel to handle the relevant fault, so as to quickly recover the normal power supply, the power supply reliability can be improved, and the whole process is completed by the control device of independent power supply.

[0041] 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 breaker (such as QT1), a second breaker (such as QT2), a first control contact and a second control contact.

[0042] The main power supply is connected to the load side breaker through the first breaker and the first control contact of the CB level dual power supply switch. The backup power supply is connected to the load side breaker through the second breaker and the second control contact of the CB level dual power supply switch. The common end of the backup power supply and the second breaker of the CB level dual power supply switch is connected to the first connection end of the bypass system.

[0043] Figure 3 The figure is a structural schematic diagram of an embodiment of the CB-level dual power supply system. Figure 3 In the example shown, the main power supply is connected to the first connection end of the first control contact in the CB-level dual power supply switch through the circuit breaker QT1, the standby power supply is connected to the first connection end of the second control contact in the CB-level dual power supply switch through the circuit breaker QT2, the second connection end of the first control contact in the CB-level dual power supply switch and the second connection end of the second control contact in the CB-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. 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 supply switch, but the circuit breaker QT1 and the circuit breaker QT2 do not have a protection function.

[0044] In the scheme of the utility model, for the CB-level dual power supply switch, a bypass system is added. When the CB-level dual power supply switch trips due to the short circuit fault (that is, a short circuit fault occurs between the CB-level dual power supply switch and the rear-end load circuit breaker), the CB-level dual power supply 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. 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 utility model can improve the power supply reliability, and the whole process is completed by the independent power supply control device. That is, for the CB-level dual power supply switch, a bypass system is added. The CB-level dual power supply switch provides a short circuit tripping signal to the control device. The control device switches the power supply to the bypass system to improve the power supply reliability.

[0045] In some embodiments, the bypass system includes 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).

[0046] The first connection end of the third circuit breaker is connected to the standby power supply as the first connection end of the bypass system. 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.

[0047] As Figure 2As shown, the main power supply is connected to the first connection end of the first contact in 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 in the PC level dual power supply switch through the circuit breaker QF2, the second connection end of the first contact in the PC level dual power supply switch and the second connection end of the second contact in 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 and the contact of the contactor KM1; the standby power supply is also connected to the common end of the important load through the circuit breaker QF3 and the contact of the contactor KM2. The circuit breaker QF3, the contactor KM1 and the contactor KM2 constitute a bypass system.

[0048] As shown in Figure 3 , the main power supply is connected to the first connection end of the first control contact in 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 in the CB level dual power supply switch integrated circuit breaker QT2, the second connection end of the first control contact in the CB level dual power supply switch and the second connection end of the second control contact in 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 and the contact of the contactor KM1; the standby power supply is also connected to the common end of the important load through the circuit breaker QF3 and the contact of the contactor KM2. The circuit breaker QF3, the contactor KM1 and the contactor KM2 constitute a bypass system.

[0049] 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, the main reasons are as follows: for the PC level dual power supply switch, as shown in Figure 2 , 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 loses power, 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, as shown in Figure 3As shown, when the fault point occurs between the dual power supply and the load circuit breaker, the fault current triggers the instantaneous tripping function of the dual power supply switch, at this time the dual power supply does not switch to the standby loop, and the load behind the dual power supply will be powered off and stop working.

[0050] In the scheme of the utility model, when a short circuit fault occurs between the dual power supply switch and the rear-end power distribution system in the dual power supply switch power distribution system, the bypass system can be switched to power supply, the rear-end load can be quickly restored to power supply, and the reliability of the dual power supply switch power distribution system is improved.

[0051] In some embodiments, the control device of the dual power supply switch power distribution system in the scheme of the utility model further comprises a dual power supply control device and a reminding device, the dual power supply control device is a PC-level dual power supply control device and a CB-level dual power supply control device, and the reminding device is an audible and visual alarm device HA.

[0052] The dual power supply control device is used for controlling the bypass system to connect the standby power supply and controlling the reminding device to send 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.

[0053] In the case that 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 supply control device.

[0054] In the scheme of the utility model, the control of the entire dual power supply switch power distribution system is completed by the automatic control device, 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, the bypass system can be quickly switched to power supply without human intervention, and the required time is short.

[0055] In some embodiments, the control device of the dual power supply switch power distribution system in the scheme of the utility model further comprises a monitoring device.

[0056] The monitoring device is used for monitoring the incoming power supply of the dual power supply or the power supply state of the dual power supply.

[0057] The dual-power supply control device is further configured to determine whether a short circuit fault occurs between the main power supply and the standby 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 standby 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 standby power supply and the load-side circuit breaker.

[0058] In the scheme of the utility model, the bypass system is added in the dual-power supply switch power distribution system, the dual-power supply switch control device determines whether to cut 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 rear-end load circuit breaker, and the rear-end important load is powered, the problem that the rear-end load loses power completely when the short circuit fault occurs (that is, the short circuit fault occurs between the dual-power supply switch and the rear-end load circuit breaker) is solved, the reliability of the dual-power supply switch power distribution system can be improved, and the rear-end equipment can be quickly restored to power supply when the short circuit fault occurs.

[0059] In some embodiments, when the dual-power supply switch system comprises a PC level dual-power supply switch, the monitoring device comprises 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 with the main power supply, and the coil of the second solid state relay is connected with the standby 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 with the dual-power supply control device; when 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 the short circuit fault occurs between the main power supply and the standby power supply and the load-side circuit breaker.

[0060] When the dual-power supply switch system comprises a CB level dual-power supply switch, the monitoring device comprises the normally closed contact (such as contact CB) of the CB level dual-power supply switch; 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 standby power supply and the load-side circuit breaker.

[0061] 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.

[0062] 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.

[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] 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: power source switching devices with short circuit protection function. QF4 and QF5 are circuit breakers with added shunt release: circuit breakers with short circuit protection function, and the circuit breakers are tripped when the shunt release is energized. QT1 and QT2 are disconnectors: power source switching devices without short circuit protection function. KA1 and KA2 are solid state relays: power source state is detected through the contact state 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 double power supply switch and the rear-end load circuit breaker), the control device sends an alarm to remind the operator to handle the related fault. PC level double power supply control device: through the detection of power state feedback, the bypass system is switched and the important load circuit breaker is disconnected. CB level double power supply control device: through the detection of double power supply state feedback, the bypass system is switched and the important load circuit breaker is disconnected.

[0066] In the scheme of the utility model, aiming at the different working principles of PC level double power supply switch and CB level double power supply switch, the specific embodiments are illustrated as follows. For PC level double power supply switch power distribution system, as shown in Fig. 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.

[0067] 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 supplied with power 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. 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 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 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, that is, according to the above control sequence, the rear-end load power supply is quickly restored.

[0068] In the dual power supply switch power distribution system using the scheme of the utility model, the normal power failure and power supply sequence after fault elimination are as follows: normal power failure sequence: 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. Normal power supply sequence: 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. Power supply sequence after fault elimination: 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. Applying this method to the dual power supply switch power distribution system can ensure uninterrupted operation of the load and improve the reliability of the dual power supply switch power distribution system.

[0069] The technical scheme of the utility model is adopted, the bypass system is added for the dual power supply switch power distribution system adopting the PC-level dual power supply switch and the CB-level dual power supply switch, 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, so that the rear-end load is quickly restored to supply power; 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, the reliability of the dual power supply switch power distribution system can be improved, and the rear-end equipment is quickly restored to supply power when a short circuit fault occurs.

[0070] According to the embodiments of the utility model, 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.

[0071] Since the processing and functions realized by the dual power switch power distribution system of the embodiment basically correspond to the embodiments, principles and examples of the device, the description of the embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0072] According to the embodiments of the utility model, a kind of air conditioner corresponding to the control device of dual power switch power distribution system is further provided.The air conditioner can include: the control device of dual power switch power distribution system described above, or the dual power switch power distribution system described above.

[0073] In some embodiments, the air conditioner includes: a machine room air conditioner.

[0074] Since the processing and functions realized by the air conditioner of the embodiment basically correspond to the embodiments, principles and examples of the device, the description of the embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0075] According to the embodiments of the utility model, a kind of dual power switch power distribution system control method corresponding to the control device of dual power switch power distribution system is further provided, as Figure 5 The flowchart of an embodiment of the method of the utility model is shown.The dual power switch power distribution system control method can include: step S110 to step S120.

[0076] At step S110, in the case where the control device of the dual power switch power distribution system further includes monitoring device and 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.

[0077] At step S120, in the case where the dual power switch power distribution system further includes dual power supply control device, whether 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 supply 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 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 the reminding message that short circuit fault occurs between the main power supply and the standby power supply and the load side circuit breaker.

[0078] The bypass system is added in the dual power switch power distribution system, the dual power switch control device determines whether to cut in the bypass system by monitoring the dual power incoming line power or the state of the dual power itself, the bypass system is used when the short circuit fault occurs between the dual power switch and the rear end load circuit breaker, and the rear end important load is supplied with power, the problem that the rear end load loses power completely 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) is solved, the reliability of the dual power switch power distribution system can be improved, and the rear end equipment can be quickly restored to power supply when the short circuit fault occurs.

[0079] The dual power incoming line power is powered in normal use, but only one way is used, and the other way is used as a backup; the dual power incoming line power is monitored, that is, whether the two incoming line powers are powered is monitored, for the CB level dual power switch system, because the CB level dual power switch system has a short circuit protection and feedback function, the state of the incoming line power does not need to be confirmed whether the short circuit fault occurs.

[0080] 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. It is assumed 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, and in the case that both ways 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 a normal state; when the main circuit is powered off, the standby power is normal, the dual power switch is normally switched to the standby power, the contact state of the solid state relay KA1 is changed to be normally open, and the contact of the solid state relay KA2 is still closed, at this time, the main power may be powered off, and the short circuit fault does not occur, if the main circuit and the standby circuit are powered off in sequence, the contact states of the solid state relay KA1 and the solid state relay KA2 are changed to be normally open in sequence, at this time, it can be determined that the short circuit fault occurs.

[0081] For the CB level dual power switch system: having a short circuit feedback function, the dual power itself can determine whether the short circuit occurs, and only the short circuit trip of the dual power itself needs to be monitored

[0082] 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.

[0083] Wherein, the normal power supply sequence of the main power supply and the standby power supply is: first control the first circuit breaker to be closed, then control the second circuit breaker to be closed, and finally control the third circuit breaker to be closed. Wherein, the normal power supply is the power supply when no short circuit fault occurs between the main power supply, the standby power supply and the load side circuit breaker.

[0084] The normal power-off sequence of the main power supply and the standby 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. Wherein, the normal power-off is the power-off when no short circuit fault occurs between the main power supply, the standby power supply and the load side circuit breaker.

[0085] 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, 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, first control the circuit breakers of the two second level loads corresponding to the second level load to be closed, and then control the first contactor and the second contactor to be disconnected.

[0086] In the scheme of the utility model, according to the different working principles of PC level dual power switch and CB level dual power switch, the specific embodiments are illustrated as follows. For the PC level dual power switch power distribution system, as shown in FIG. 1, the main power supply and the standby power supply are connected to the first circuit breaker and the second circuit breaker respectively, the first circuit breaker and the second circuit breaker are connected to the PC level dual power switch, the PC level dual power switch is connected to the third circuit breaker, the third circuit breaker is connected to the first contactor and the second contactor, and the first contactor and the second contactor are connected to the load side circuit breaker. 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 only when one of the solid-state relay KA1 or the solid-state relay KA2 changes, it can be judged as the normal switching of the system upper power distribution source.

[0087] 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 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.

[0088] In the dual power switch power distribution system using the scheme of the utility model, the normal power failure and the power supply sequence after troubleshooting are as follows: the normal power failure 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 supply 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 supply 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 method can be applied to the dual power switch power distribution system, can ensure the uninterrupted operation of the load, and improves the reliability of the operation of the dual power switch power distribution system.

[0089] Since the processing and functions realized by the method of the embodiment are basically corresponding to the embodiments, principles and examples of the control device of the dual power switch power distribution system, the description of the embodiment is not described in detail, and the related description in the foregoing embodiments can be referred to, and is not described here.

[0090] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0091] The above only describes the embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the scope of the claims of the utility model.

Claims

1. A control device for a dual-power switch distribution system, characterized in that, The application 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 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 for first level loads and a circuit breaker for second level loads; the circuit breaker for first level loads is connected to first level loads, and the circuit breaker for second level loads is connected to second level loads; 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 for second level loads and second level loads; 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 second level loads through the circuit breaker for second level loads under the control of the bypass system.

2. The control device for dual mains switch power distribution system according to claim 1, characterized in that, 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; 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 for dual mains switch power distribution system according to claim 1, characterized in that, 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; the 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.

4. The control device for dual mains switch power 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 is connected to the backup power supply as the first connection end of the bypass system; 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 that the number of the 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 respectively as the second connection ends of the bypass system.

5. The control device for dual mains switch electrical distribution system according to claim 4, wherein Further comprising: A dual power supply control device and a reminding device; wherein, The dual power supply control device is configured to control the bypass system to connect the standby 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 standby power supply and the load side circuit breaker 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. In the case that the bypass system comprises a first contactor and a 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 supply control device.

6. The control device for dual mains switch electrical distribution system according to claim 5, wherein Further comprising: A monitoring device; The 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 supply control device is further configured to determine whether a short circuit fault occurs between the main power supply and the standby 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 standby 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 standby power supply and the load side circuit breaker 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.

7. The control device for dual mains switch electrical distribution system according to claim 6, wherein, In the case that the dual power supply switch system comprises a PC-level dual power supply switch, the monitoring device comprises 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 standby 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 supply control device; and in the case that 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 simultaneously, 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. In the case that the dual power supply switch system comprises a CB-level dual power supply switch, the monitoring device comprises the normally closed contact of the CB-level dual power supply switch; and in the case that the state of the normally closed contact of the CB-level dual power supply switch changes, 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. Comprising:

8. A dual power switch distribution system, characterized by, The control device of the dual power supply switch power distribution system according to any one of claims 1 to 7. Comprising:

9. An air conditioner characterized by comprising: The control device of the dual power supply switch power distribution system according to any one of claims 1 to 7, or the dual power supply switch power distribution system according to claim 8. The air conditioner comprises a machine room air conditioner.

10. The air conditioner according to claim 9, wherein ​

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