An uninterrupted power supply maintenance bypass device and uninterrupted power supply system

Abstract

The application relates to the technical field of power maintenance detection, in particular to an uninterrupted power supply maintenance bypass device and an uninterrupted power supply system, which solve the technical problem of long power-off time during maintenance of the uninterrupted power supply of a 35kV substation in the prior art. When the uninterrupted power supply needs to be replaced or maintained, the current delivered to the input end of the uninterrupted power supply is conducted to the input switch by closing the input switch, no current passes through the input end of the uninterrupted power supply, the first switch is switched to be connected to the first power supply device at the main path end, the output switch is closed, the current is output through the output end of the output switch, and then the uninterrupted power supply is connected to supply power to the load; a loop is formed between the uninterrupted power supply maintenance bypass device and the load connected to the uninterrupted power supply, that is, the uninterrupted power supply maintenance bypass device plays a role, no current passes through the uninterrupted power supply at this time, the uninterrupted power supply can be removed, and the uninterrupted power supply can be maintained or replaced.

Description

Technical Field

[0001] This application relates to the field of power maintenance and testing technology, specifically to an uninterruptible power supply (UPS) maintenance bypass device and an UPS system. Background Technology

[0002] UPS, or Uninterruptible Power Supply, is a type of uninterruptible power supply containing energy storage devices. It is a constant voltage and frequency uninterruptible power supply with an inverter as its main component. It is primarily used to provide uninterrupted power to single computers, computer network systems, or other power electronic equipment. When the mains input is normal, the UPS stabilizes the mains voltage and supplies it to the load. In this state, the UPS acts as an AC mains voltage regulator, while simultaneously charging its internal battery. When the mains power is interrupted (power outage), the UPS immediately uses the energy from its internal battery to continue supplying 220V AC power to the load through an inverter, ensuring the load continues to operate normally and protecting the load's hardware and software from damage. UPS devices typically provide protection against both overvoltage and undervoltage. An uninterruptible power supply (UPS) consists of electronic power conversion devices and measurement and control devices, and is a key power supply device in substation automation systems. The UPS utilizes the chemical energy of batteries as backup energy, acting as an energy conversion device to continuously provide (AC) power to user equipment during mains power outages, substation failures, and other grid faults.

[0003] In the existing technology, uninterruptible power supplies (UPS) are key power equipment in substations. When an UPS needs to be repaired, maintained, or malfunctions during use, a maintenance bypass device is used to supply power to the load connected to the UPS. However, when the UPS currently used in 35kV substations needs to be repaired, there is a problem of long power outage time, which affects the continuous power supply to the load. Summary of the Invention

[0004] In view of this, this application provides an uninterruptible power supply (UPS) maintenance bypass device and an UPS system, which solves the technical problem of long power outage time during UPS maintenance in 35kV substations in the prior art.

[0005] According to one aspect of this application, an uninterruptible power supply maintenance bypass device includes:

[0006] First power supply device;

[0007] A first switching switch connected to the first power supply device;

[0008] An input switch, wherein the input terminal of the input switch is connected to the input terminal of the uninterruptible power supply, and the output terminal of the input switch is connected to the input terminal of the first switching switch;

[0009] An output switch, the input terminal of which is connected to the output terminal of the first switching switch, and the output terminal of which is connected to the output terminal of the uninterruptible power supply.

[0010] In one possible implementation, the first switching switch includes a dual-power automatic switching switch; or

[0011] Static changeover switch.

[0012] One possible implementation also includes:

[0013] A second switch, the output of which is connected to the input of the first switch; and

[0014] A switching circuit is provided, one end of which is connected to the input terminal of the second switching switch, and the other end of which is connected to the output terminal of the uninterruptible power supply.

[0015] One possible implementation also includes:

[0016] A first terminal block is disposed between the switching circuit and the output terminal of the uninterruptible power supply, and the first terminal block is used to connect the switching circuit and the uninterruptible power supply.

[0017] One possible implementation also includes:

[0018] A first current and voltage measuring device is disposed between the input switch and the first switching switch;

[0019] One end of the first current and voltage measuring device is connected to the output terminal of the input switch, and the other end of the first current and voltage measuring device is connected to the input terminal of the first switching switch.

[0020] One possible implementation also includes:

[0021] A second current and voltage measuring device is disposed between the first switching switch and the output switch;

[0022] One end of the second current and voltage measuring device is connected to the output terminal of the first switching switch, and the second current and voltage measuring device is connected to the output terminal of the uninterruptible power supply.

[0023] One possible implementation also includes:

[0024] The second terminal block has one end connected to the input terminal of the uninterruptible power supply and the other end connected to the input terminal of the input switch.

[0025] One possible implementation also includes:

[0026] The third terminal is connected at one end to the output terminal of the uninterruptible power supply and at the other end to the output terminal of the output switch.

[0027] In one possible implementation, the second terminal block includes a second T-type non-breaking terminal block; and / or

[0028] The third terminal block includes a third T-type non-breaking terminal block.

[0029] A second aspect of this application is an uninterruptible power supply system, including the uninterruptible power supply maintenance bypass device described in any of the preceding claims.

[0030] This application provides an uninterruptible power supply (UPS) maintenance bypass device and UPS system. When it is necessary to replace or maintain the UPS, the input terminal of the UPS is connected to the input terminal of an input switch. The output terminal of the input switch is connected to the input terminal of a first switching switch, the input terminal of an output switch is connected to the output terminal of the first switching switch, and the output terminal of the output switch is connected to the output terminal of the UPS. By closing the input switch, the current supplied to the input terminal of the UPS is conducted to the input switch. At this time, no current flows through the input terminal of the UPS. The first switching switch is switched to the main circuit terminal and connected to the first power supply device. When the output switch is closed, the current is output through the output terminal of the output switch to supply power to the load connected to the UPS. The UPS maintenance bypass device and the load connected to the UPS form a loop, that is, the UPS maintenance bypass device is in operation. At this time, no current flows through the UPS, so the UPS can be removed, thus realizing the maintenance or replacement of the UPS. Attached Figure Description

[0031] Figure 1 The diagram shown is a schematic diagram of an uninterruptible power supply maintenance bypass device provided in an embodiment of this application.

[0032] Figure 2 The diagram shown is a schematic diagram of an uninterruptible power supply maintenance bypass device according to another embodiment of this application;

[0033] Figure 3 The diagram shown is a structural schematic of an uninterruptible power supply maintenance bypass device provided in another embodiment of this application. Attached image description:

[0035] 1. First switching switch; 2. Input switch; 3. Output switch; 4. First power supply device; 5. First terminal block; 6. First current and voltage measuring device; 7. Second current and voltage measuring device; 8. Second terminal block; 9. Third terminal block; 10. Uninterruptible power supply; 11. Second switching switch. Detailed Implementation

[0036] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0037] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] Uninterruptible power supplies (UPS) are key power equipment in substations. During the operation of the UPS system, when maintenance or failure occurs, the UPS maintenance bypass needs to be used to supply power to the load. However, the UPS currently used in 35kV substations suffers from long power outages when maintenance is required, which affects the continuous power supply to the load.

[0040] To ensure uninterrupted power supply during uninterruptible power supply (UPS) failures or maintenance, this application designs a UPS maintenance bypass device. It should be noted that an UPS system mainly consists of five parts: the main circuit, bypass circuit, battery, and other power input circuits; a rectifier (REC) for AC / DC conversion; an inverter (INV) for DC / AC conversion; an inverter and bypass output switching circuit; and a storage battery. The UPS connects to the load circuit and provides power to it.

[0041] Figure 1 The diagram shown is a structural schematic of an uninterruptible power supply maintenance bypass device according to an embodiment of this application. Figure 1 As shown, the uninterruptible power supply (UPS) maintenance bypass device includes: a first power supply device 4, which provides power to the UPS maintenance bypass device; a first switching switch 1 connected to the first power supply device 4, which is used for automatic switching between power supplies; an input switch 2, the input terminal of which is connected to the input terminal of the UPS 10, and the output terminal of which is connected to the input terminal of the first switching switch 1; and an output switch 3, the input terminal of which is connected to the output terminal of the first switching switch 1, and the output terminal of which is connected to the output terminal of the UPS 10. When the uninterruptible power supply (UPS) 10 is operating, the input side of UPS 10 receives AC mains power at a voltage of 230V, while the output side receives 220V, resulting in a 10V voltage difference. The built-in bypass device within the UPS system balances this 10V voltage difference. When UPS 10 needs replacement or maintenance, the input terminal of UPS 10 is connected to the input terminal of input switch 2. The output terminal of input switch 2 is connected to the input terminal of first switching switch 1, the input terminal of output switch 3 is connected to the output terminal of first switching switch 1, and the output terminal of output switch 3 is connected to the output terminal of UPS 10. Closing input switch 2... The current supplied to the input terminal of the uninterruptible power supply 10 is turned on to the input switch 2. At this time, no current flows through the input terminal of the uninterruptible power supply 10. The first switching switch 1 is switched to the main circuit terminal and connected to the first power supply device 4. The output switch 3 is closed, and the current is output through the output terminal of the output switch 3 to supply power to the load connected to the uninterruptible power supply 10. The maintenance bypass device of the uninterruptible power supply 10 forms a circuit with the load connected to the uninterruptible power supply 10, that is, the maintenance bypass device of the uninterruptible power supply 10 plays a role. At this time, no current flows through the uninterruptible power supply 10, so the uninterruptible power supply 10 can be removed, so that the uninterruptible power supply 10 can be maintained, repaired or replaced.

[0042] When the uninterruptible power supply 10 is restored, the input switch 2 and the output switch 3 must be disconnected. The first switching switch 1 cannot complete the switching between the uninterruptible power supply 10 and the first power supply device 4. In order to prevent the load connected to the uninterruptible power supply 10 from losing power, the uninterruptible power supply 10 needs to be turned on at this time so that the uninterruptible power supply 10 can be used to supply power to the load.

[0043] It should be noted that, in order to better control the uninterruptible power supply 10, an AC input switch for the uninterruptible power supply 10 is set at the input terminal of the uninterruptible power supply 10, and an output switch 3 for the uninterruptible power supply 10 is set at the output terminal of the uninterruptible power supply 10.

[0044] When the input switch 2 is closed, the main circuit connection with the first power supply device 4 is switched through the first switching switch 1. When the output switch 3 is closed, the maintenance bypass device of the uninterruptible power supply 10 comes into play, connecting the load of the uninterruptible power supply 10 and transmitting or supplying power to the load through the first power supply device 4. Then, after disconnecting the AC input switch and the output switch 3 of the uninterruptible power supply 10, maintenance, repair or replacement of the uninterruptible power supply 10 can be achieved.

[0045] When power is restored to the uninterruptible power supply 10, the input switch 2 and the output switch 3 must be disconnected. That is, the maintenance bypass device of the uninterruptible power supply 10 is disconnected and there is no current transmission for load transmission or power supply. At this time, the AC input switch and the output switch 3 of the uninterruptible power supply 10 need to be closed, and the uninterruptible power supply 10 needs to be turned on so that the uninterruptible power supply 10 can be used to supply power to the load.

[0046] Optionally, the first transfer switch 1 includes a dual-power automatic transfer switch; when maintenance or repair of the uninterruptible power supply 10 is required, the dual-power automatic transfer switch performs the switching operation between the uninterruptible power supply 10 and the first power supply device 4, restoring power supply to the load. The dual-power automatic transfer switch has short-circuit and overload protection functions, automatic switching functions for overvoltage, undervoltage, and phase loss, and intelligent alarm functions. The automatic switching parameters can be freely set externally, and it has intelligent operation protection functions. Therefore, the selection of a dual-power automatic transfer switch for the first transfer switch 1 ensures the safe operation of the maintenance bypass device for the uninterruptible power supply 10.

[0047] An automatic transfer switch (ATS), as the name suggests, automatically connects to a backup power source in the event of a sudden power outage, ensuring the load continues to operate without interruption. Simply put, the purpose of an ATS is to have one primary power source and one backup power source. When the primary power source fails or is interrupted, the ATS automatically switches to the backup power source (which can also be a generator for small loads), allowing the load to continue operating normally. The ATS is a high-performance, safe, reliable, highly automated, and widely applicable automatic transfer switch.

[0048] Specifically, the dual power supply automatic transfer switch includes a dual power supply automatic transfer switch with a switching time of no more than 15ms. The purpose of selecting a dual power supply automatic transfer switch with a switching time of no more than 15ms is to ensure that the load is not powered off when the uninterruptible power supply 10 fails, thus guaranteeing the safe operation of the load of the uninterruptible power supply 10.

[0049] Optionally, the first switching switch 1 includes a static transfer switch. The static transfer switch enables uninterrupted (<8ms) switching between the uninterruptible power supply 10 and the first power supply, ensuring that the amplitude, frequency, and phase difference between the two AC power supplies are controlled within a certain range. Its main function is to ensure a truly uninterrupted switching between the uninterruptible power supply 10 and the first power supply when the uninterruptible power supply 10 fails or requires maintenance or testing, preventing the connection of two input power supplies that would generate backflow.

[0050] Static transfer switches are mainly used for switching between two power supplies, providing an automatic power selection system. Under normal operating conditions, the load remains connected to the main power supply when it is within its normal voltage range. In the event of a main power supply failure, the load automatically switches to the backup power supply; upon restoration of the main power supply, the load automatically switches back to the main power supply.

[0051] In one possible implementation, Figure 2 The diagram shown is a structural schematic of an uninterruptible power supply maintenance bypass device according to another embodiment of this application. Figure 2As shown, the uninterruptible power supply 10 maintenance bypass device also includes: a second switching switch 11, the output terminal of which is connected to the input terminal of the first switching switch 1; and a switching circuit, one end of which is connected to the input terminal of the second switching switch 11, and the other end of which is connected to the output terminal of the uninterruptible power supply 10. When the uninterruptible power supply 10 is working, the input AC mains voltage on the input side of the uninterruptible power supply 10 is 230V, and the output voltage is 220V, resulting in a 10V voltage difference. When the built-in bypass device of the uninterruptible power supply 10 fails, if a forced switch is made between the uninterruptible power supply 10 and the first power supply device 4, it will cause the inverter in the uninterruptible power supply 10 to burn out, the upstream switch to trip, or the load to burn out, resulting in a loss of power to the load. Therefore, in order to solve the 10V voltage difference, the second switching switch 11 needs to be connected to the input terminal of the first switching switch 1, and the second switching switch 11 is connected to the switching circuit. By closing the second switching switch 11, the second switching switch 11 is connected to the standby input terminal switched to by the first switching switch 1, and the output switch 3 is closed. At this time, the load at the output terminal of the uninterruptible power supply 10 is connected to the switching circuit, the second switching switch 11, the first switching switch 1, and the output switch 3. The output voltage of the output switch 3 is 220V, which can be connected to the output load of the uninterruptible power supply 10. During the switching process of the first switching switch 1, the 10V voltage difference can be balanced by the action of the second switching switch 11 and the switching circuit. After closing the input switch 2, the first switching switch 1 automatically switches back to the main input terminal. At this time, the second switching switch 11 and the switching circuit are disconnected, that is, the input switch 2 is connected to the load at the input terminal of the uninterruptible power supply 10, and the output switch 3 is connected to the load at the output terminal of the uninterruptible power supply 10. This ensures that no current flows through the uninterruptible power supply 10, so that the uninterruptible power supply 10 can be repaired, removed, or replaced. At the same time, it avoids the phenomenon of power outage of the load of the uninterruptible power supply 10. By using the second switching switch 11 and the switching circuit, the output terminal of the output switch 3 of the uninterruptible power supply 10 maintenance bypass device is directly connected to the output terminal of the uninterruptible power supply 10. This prevents the uninterruptible power supply 10 from being internally burned out or damaged due to the 10V voltage difference when the output terminal of the output switch 3 is connected to the load of the uninterruptible power supply 10, thus improving safety.

[0052] In one possible implementation, Figure 3 The diagram shown is a structural schematic of an uninterruptible power supply maintenance bypass device according to another embodiment of this application. Figure 2 and 3As shown, the maintenance bypass device for the uninterruptible power supply 10 further includes a first terminal block 5. The first terminal block 5 is disposed before the switching circuit and the output terminal of the uninterruptible power supply 10, and is used to connect the switching circuit and the uninterruptible power supply 10. The purpose of using the first terminal block 5 is to enable the second switching switch 11 and the switching circuit to quickly connect to the line at the output terminal of the uninterruptible power supply 10, so that when the second switching switch 11 is closed, the second switching switch 11 and the switching circuit short-circuit the output terminal of the uninterruptible power supply 10, and the current flows through the second switching switch 11 and the switching circuit to the output terminal of the output switch 3 to conduct to the load at the output terminal of the uninterruptible power supply 10; thereby disconnecting the circuit at the output terminal of the uninterruptible power supply 10, so as to facilitate further inspection of the uninterruptible power supply 10 by the staff.

[0053] In one possible implementation, such as Figure 2 and 3 As shown, the first terminal block 5 includes a first T-type non-breaking terminal block. The selection of the T-type non-breaking terminal block in the first terminal block 5 enables the second switch 11 to quickly connect to the output of the uninterruptible power supply 10.

[0054] Specifically, the first terminal 5 includes a first housing, which is made of polypropylene and has the advantages of high temperature resistance, corrosion resistance and good insulation, which is sufficient to ensure personal safety during quick wiring; and a first terminal interior set inside the first housing, which is made of copper-plated tin material to ensure the conductivity and contact performance of the cable.

[0055] In one possible implementation, such as Figure 2 and 3As shown, the uninterruptible power supply 10 maintenance bypass device further includes: a first current and voltage measuring device 6, which is disposed between the input switch 2 and the first switching switch 1; one end of the first current and voltage measuring device 6 is connected to the output terminal of the input switch 2, and the other end of the first current and voltage measuring device 6 is connected to the input terminal of the first switching switch 1. When input switch 2 is closed, the first current source voltage measuring device is used to detect whether the current and voltage information flowing through input switch 2 is correct. For example, if the input terminal of the uninterruptible power supply 10 is generally connected to the mains power and the voltage at this input terminal is 230V, then the voltage displayed by the first current and voltage measuring device is 230V, indicating that the load connected to the input terminal of the uninterruptible power supply 10 at input switch 2 is connected. The first switching switch 1 completes the switching of the main power supply, providing power to the load of the uninterruptible power supply 10. The output switch 3 is closed, connecting the load at the output terminal of the uninterruptible power supply 10, thus providing power to the load of the uninterruptible power supply 10. At this time, the current at the input terminal of the uninterruptible power supply 10 is short-circuited, so the input switch 2 and the output switch 3 of the uninterruptible power supply 10 can be disconnected, allowing for replacement or maintenance of the uninterruptible power supply 10. The first current and voltage measuring device 6 is used to monitor the input current and voltage status at input switch 2 to provide a reference for maintenance personnel and avoid misoperation.

[0056] In one possible implementation, such as Figure 2 and 3 As shown, the uninterruptible power supply (UPS) maintenance bypass device further includes: a second current and voltage measuring device 7, which is disposed between the first switching switch 1 and the output switch 3; one end of the second current and voltage measuring device 7 is connected to the output terminal of the first switching switch 1, and the second current and voltage measuring device 7 is connected to the output terminal of the UPS 10. The second current and voltage measuring device 7 is used to measure the current and voltage output after passing through the second switching switch 11, providing a reference for maintenance personnel and preventing misoperation.

[0057] In one possible implementation, such as Figure 2 and 3 As shown, the uninterruptible power supply (UPS) maintenance bypass device also includes a second terminal block 8. One end of the second terminal block 8 is connected to the input terminal of the UPS 10, and the other end is connected to the input terminal of the input switch 2. The purpose of using the second terminal block 8 is to enable the input switch 2 to quickly connect to the circuit at the input terminal of the UPS 10, thereby blocking the current flowing into the input terminal of the UPS 10, which is connected to the input switch 2. This disconnects the circuit at the input terminal of the UPS 10, facilitating further inspection of the UPS 10 by personnel.

[0058] In one possible implementation, such as Figure 2 and3 As shown, the second terminal block 8 includes a first T-type non-breaking terminal block. The selection of the T-type non-breaking terminal block for the second terminal block 8 enables the input switch 2 to quickly connect to the input terminal of the uninterruptible power supply 10.

[0059] Specifically, the second terminal 8 includes a second housing made of polypropylene, which has the advantages of high temperature resistance, corrosion resistance and good insulation, and is sufficient to ensure personal safety during quick wiring; and a second terminal interior set inside the second housing, which is made of copper-plated tin material to ensure the conductivity and contact performance of the cable.

[0060] In one possible implementation, such as Figure 2 and 3 As shown, the uninterruptible power supply (UPS) maintenance bypass device also includes a third terminal block 9. One end of the third terminal block 9 is connected to the output terminal of the UPS 10, and the other end of the third terminal block 9 is connected to the output terminal of the output switch 3. The purpose of using the third terminal block 9 is to enable the output terminal of the output switch 3 to quickly connect to the output terminal of the UPS 10, thereby blocking the current supplied to the output terminal of the UPS 10, which is connected to the output switch 3. This disconnects the input circuit of the UPS 10, facilitating further inspection of the UPS 10 by personnel.

[0061] In one possible implementation, such as Figure 2 and 3 As shown, the third terminal 9 includes a second T-type non-breaking terminal. The selection of the T-type non-breaking terminal for the third terminal 9 enables the output switch 3 to quickly connect to the output terminal of the uninterruptible power supply 10.

[0062] Specifically, the third terminal 9 includes a third housing, which is made of polypropylene and has the advantages of high temperature resistance, corrosion resistance and good insulation, which is sufficient to ensure personal safety during quick wiring; and the interior of the third terminal, which is made of copper-plated tin, to ensure the conductivity and contact performance of the cable.

[0063] In a second aspect, this application provides an uninterruptible power supply (UPS) system, including the aforementioned UPS maintenance bypass device. By using the UPS maintenance bypass device, the current at the input and output terminals of the UPS 10 can be turned on, thereby disconnecting or short-circuiting the UPS 10 circuit, allowing the UPS 10 to be removed for replacement or repair.

[0064] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Any modifications or equivalent substitutions made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. An uninterruptible power supply (UPS) maintenance bypass device, characterized in that, include: First power supply device (4); A first switching switch (1) connected to the first power supply device (4); Input switch (2), the input terminal of which is connected to the input terminal of uninterruptible power supply (10), and the output terminal of which is connected to the input terminal of the first switching switch (1); Output switch (3), the input terminal of the output switch (3) is connected to the output terminal of the first switching switch (1), and the output terminal of the output switch (3) is connected to the output terminal of the uninterruptible power supply (10); A second switch (11), the output of which is connected to the input of the first switch (1); and A switching circuit, one end of which is connected to the input terminal of the second switching switch (11), and the other end of which is connected to the output terminal of the uninterruptible power supply (10); When the second switching switch (11) is closed, the second switching switch (11) is connected to the standby input terminal switched to by the first switching switch (1), and the output switch is closed. At this time, the load of the output terminal of the uninterruptible power supply (10) is connected to the switching circuit, the second switching switch (11), the first switching switch (1), and the output switch. After the input switch (2) is closed, the first switching switch (1) automatically switches back to the main input terminal. At this time, the second switching switch (11) and the switching circuit are disconnected, so that no current flows through the uninterruptible power supply (10).

2. The uninterruptible power supply maintenance bypass device according to claim 1, characterized in that, The first switching switch (1) includes a dual-power automatic switching switch; or Static changeover switch.

3. The uninterruptible power supply maintenance bypass device according to claim 1, characterized in that, Also includes: The first terminal (5) is disposed between the switching circuit and the output terminal of the uninterruptible power supply (10), and the first terminal (5) is used to connect the switching circuit and the uninterruptible power supply (10).

4. The uninterruptible power supply maintenance bypass device according to claim 1, characterized in that, Also includes: A first current and voltage measuring device (6) is disposed between the input switch (2) and the first switching switch (1); One end of the first current and voltage measuring device (6) is connected to the output end of the input switch (2), and the other end of the first current and voltage measuring device is connected to the input end of the first switching switch (1).

5. The uninterruptible power supply maintenance bypass device according to claim 1, characterized in that, Also includes: The second current and voltage measuring device (7) is disposed between the first switching switch (1) and the output switch (3); One end of the second current and voltage measuring device (7) is connected to the output end of the first switching switch (1), and the second current and voltage measuring device (7) is connected to the output end of the uninterruptible power supply (10).

6. The uninterruptible power supply maintenance bypass device according to claim 1, characterized in that, Also includes: The second terminal (8) is connected at one end to the input terminal of the uninterruptible power supply (10) and at the other end to the input terminal of the input switch (2).

7. The uninterruptible power supply maintenance bypass device according to claim 6, characterized in that, Also includes: The third terminal (9) is connected at one end to the output terminal of the uninterruptible power supply (10) and at the other end to the output terminal of the output switch (3).

8. The uninterruptible power supply maintenance bypass device according to claim 7, characterized in that, The second terminal block (8) includes a second T-type non-breaking terminal block; and / or The third terminal block (9) includes a third T-type non-breakable terminal block.

9. An uninterruptible power supply system, characterized in that, Includes the uninterruptible power supply maintenance bypass device as described in any one of claims 1-8.

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