CN205811651U - A Switching Circuit Facilitating Offline Maintenance of UPS - Google Patents

Abstract

The utility model provides a switching circuit beneficial to UPS offline maintenance, which comprises three parallel branches, wherein the starting ends of the three parallel branches are connected with an input power UPS, the first branch is a hard maintenance bypass channel, and an alternating current manual hard maintenance bypass circuit breaker is arranged in the first branch; the second branch circuit is an alternating current automatic bypass channel, and an alternating current automatic bypass circuit breaker and a static switch are sequentially connected in series between the start end and the tail end of the second branch circuit; an output circuit breaker is arranged between the tail end of the first branch and the tail end of the second branch, and the output end of the output circuit breaker is the output end of the UPS; the incoming line circuit breaker, the rectifier filter, the inverter, the isolation transformer and the static switch are sequentially connected in series between the starting end and the tail end of the third branch circuit; and a connecting line of the rectifier filter and the inverter in series is connected with the backup battery pack through a wire. The utility model discloses simple and practical, prolonged UPS power life, improved power supply stability, reduced UPS fault rate.

Description

A Switching Circuit Facilitating Offline Maintenance of UPS

technical field

The utility model relates to a UPS power supply circuit, in particular to a switching circuit which is beneficial to UPS off-line maintenance.

Background technique

In the actual application of UPS on site, most of the loads carried by UPS power supply have high requirements on the continuous power supply of the power supply, and important occasions require continuous and uninterrupted power supply for many years. In this case, the UPS routine maintenance work is better performed for the inspection and maintenance content that does not require power failure, but for the maintenance content that requires power failure, it is often not performed in time because the UPS cannot be powered off. The result is: when the dust deposited in the main unit accumulates to a certain extent, it will cause poor heat dissipation, and the main unit will work abnormally when the air is humid; when the input power fails, the energy storage battery will supply power to the load through the inverter. At this time, because the energy storage battery works in the floating state for a long time, its life and performance cannot be guaranteed normally. As long as one battery fails, it will cause the load power supply to be interrupted. The final result will lead to the impact on production, resulting in passive shutdown maintenance. The contradiction between the continuous power supply of the load and the requirement of UPS power outage maintenance is prominent.

The current UPS products have considered the AC automatic bypass channel in the design of the power supply circuit. In theory, it can realize dual power supply switching and realize regular power outage maintenance of UPS. However, with the upgrading of UPS products, the charging, inverter, discharging, bypass switching and various protection controls of UPS have been intelligentized, and this intelligence is realized by the microprocessor inside the UPS. Since the power supply of the microprocessor and various switching devices is provided by the UPS host, once the UPS host fails, it will cause the microprocessor to work abnormally, making various intelligent controls invalid, resulting in interruption of UPS load power supply. In this way, even if the UPS power supply provides an AC automatic bypass channel, it will eventually affect the load power supply due to abnormal control switching.

Utility model content

In order to solve the above-mentioned problems existing in the prior art, the utility model provides a switching circuit that facilitates UPS off-line maintenance.

The technical scheme adopted by the utility model is: a switching circuit that facilitates offline maintenance of UPS, including three branches connected in parallel. The first branch is equipped with an AC manual hard maintenance bypass circuit breaker; the second branch is an AC automatic bypass channel, and the AC automatic bypass circuit breaker and static switch are connected in series from the beginning to the end of the second branch ;An output circuit breaker is installed between the end of the first branch and the end of the second branch, and the output end of the output circuit breaker is the output end of the power supply UPS; the incoming circuit breaker is connected in series between the beginning and the end of the third branch , a rectifier filter, an inverter, an isolation transformer, and a static switch; the connection line connecting the rectifier filter and the inverter in series is connected to the backup battery pack through wires.

Further, the load capacity of the AC manual hard maintenance bypass circuit breaker, AC automatic bypass circuit breaker, output circuit breaker, and incoming line circuit breaker is the same as that of the input power supply UPS.

The beneficial effects of the utility model are: the utility model proposes a simple and practical improved switching circuit for UPS power supply, which solves the contradiction between UPS load continuous power supply and power outage maintenance, and realizes UPS power supply and bypass switching; It solves the contradiction between UPS continuous power supply and power outage maintenance in production enterprises, and saves expensive investment costs such as hot backup, redundancy, and N+1 for UPS, realizes the on-line and off-line of UPS power supply, and ensures that UPS power supply is in accordance with maintenance technology. Regular maintenance and maintenance are carried out according to the standard, which prolongs the life of UPS equipment and reduces the failure rate.

Description of drawings

Fig. 1. structural representation of the utility model.

In the figure: 1. Incoming circuit breaker, 2. AC automatic bypass circuit breaker, 3. Rectifier filter, 4. Backup battery pack, 5. Inverter, 6. Isolation transformer, 7. Static switch, 8. Static Switch, 9. AC manual hard maintenance bypass circuit breaker, 10. Output circuit breaker, 11. Input power UPS.

detailed description

Embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

A switching circuit that facilitates offline maintenance of UPS, including three branches in parallel, the starting ends of the three branches in parallel are connected to the input power supply UPS, wherein the first branch is a hard maintenance bypass channel, and the first branch is installed with AC manual hard maintenance bypass circuit breaker 9; the second branch is an AC automatic bypass channel, and the AC automatic bypass circuit breaker 2 and static switch 7 are connected in series from the beginning to the end of the second branch; the first branch An output circuit breaker 10 is installed between the end and the end of the second branch, and the output end of the output circuit breaker 10 is the output end of the power supply UPS; between the beginning and the end of the third branch, the incoming circuit breaker 1, rectification and filtering are connected in series in sequence Converter 3, inverter 5, isolation transformer 6, static switch 8; The connection line connected in series between the rectifier filter 3 and the inverter 5 is connected to one end of the backup battery pack 4 through a wire, and the other end of the backup battery pack 4 is grounded.

As shown in Figure 1, after preparing equipment and materials such as circuit breakers and wires equivalent to the load capacity of the power supply UPS, use the opportunity of load power failure maintenance to carry out the implementation. The specific implementation process and content are as follows: on the original UPS circuit breaker 1 Connect the AC manual hard maintenance bypass circuit breaker 9 in parallel, and install an output circuit breaker 10 at the output end of the original UPS; the AC automatic bypass circuit breaker 2 passes through the output end of the static switch 7 and the input power passes through the inverter 5 and the static switch After the output terminals of 8 are connected in parallel, they are connected to the input terminal of output circuit breaker 10; the output terminal of AC manual hard maintenance bypass circuit breaker 9 is connected to the output terminal of output circuit breaker 10 to supply power to the load.

When the UPS supplies power normally, the incoming circuit breaker 1 and the output circuit breaker 10 are closed, and the AC automatic bypass circuit breaker 2 and the AC manual hard maintenance bypass circuit breaker 9 are opened. When the UPS or battery pack needs offline maintenance, close the AC automatic bypass circuit breaker 2 on the UPS operation panel, the UPS switches to the bypass state, and then manually close the AC manual hard maintenance bypass circuit breaker 9, at this time input The power supplies power to the load through the AC automatic bypass circuit breaker 2 and the AC manual hard maintenance bypass circuit breaker 9 at the same time; then disconnect the UPS output circuit breaker 10 and the UPS incoming line circuit breaker 1, at this time the input power is through the AC manual hard maintenance The bypass circuit breaker 9 supplies power to the load, and the UPS and the battery pack can be checked and maintained offline.

When the UPS and battery pack inspection and maintenance are completed and need to go online again, first close the UPS incoming circuit breaker 1 to make the UPS host and its micro-processing power supply and operate normally, and switch the AC automatic bypass circuit breaker 2 on the UPS operation panel Closed, the UPS switches to the bypass state, and then closes the output circuit breaker 10 of the UPS. At this time, the input power supplies power to the load through the AC automatic bypass circuit breaker 2 and the AC manual hard maintenance bypass circuit breaker 9 at the same time; finally disconnect the AC Manual hard maintenance bypass circuit breaker 9. Start the UPS through the UPS operation panel, and the load is normally powered by the UPS power supply.

Claims (2)

1. A switching circuit that is beneficial to UPS offline maintenance, characterized in that: it includes three branches in parallel, the beginning of the three branches in parallel is connected to the input power supply UPS, wherein the first branch is a hard maintenance bypass channel, and the first branch is a hard maintenance bypass channel. An AC manual hard maintenance bypass circuit breaker (9) is installed in one branch; the second branch is an AC automatic bypass channel, and the AC automatic bypass circuit breaker (2) is connected in series from the beginning to the end of the second branch and a static switch (7); an output circuit breaker (10) is installed between the end of the first branch and the end of the second branch, and the output end of the output circuit breaker (10) is the output end of the power supply UPS; the third branch The incoming circuit breaker (1), rectification filter (3), inverter (5), isolation transformer (6), and static switch (8) are connected in series from the beginning to the end of the circuit; the rectification filter (3) and inverter The connection line of the transformer (5) in series is connected with the backup battery pack (4) by wires. 2. A switching circuit that facilitates UPS offline maintenance as claimed in claim 1, characterized in that: AC manual hard maintenance bypass circuit breaker (9), AC automatic bypass circuit breaker (2), output circuit breaker (10 ), the load capacity of the incoming circuit breaker (1) is the same as that of the input power supply UPS.