CN219499026U

CN219499026U - Multi-loop UPS system with short-circuit protection

Info

Publication number: CN219499026U
Application number: CN202223501356.2U
Authority: CN
Inventors: 牛振涛; 袁磊; 马力; 张欢旭; 官国扬
Original assignee: State Power Investment Group Jingmen Green Power Energy Co ltd
Current assignee: State Power Investment Group Jingmen Green Power Energy Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-08-08
Anticipated expiration: 2032-12-22

Abstract

The utility model discloses a multi-loop UPS system with short-circuit protection, which comprises a plant main power supply, a plant standby power supply, a UPS main cabinet electrically connected with the plant main power supply, a UPS bypass voltage stabilizing cabinet electrically connected with the plant standby power supply and a feeder cabinet, wherein a rectifier, an inverter and a static switch which are sequentially connected through wires are arranged in the main cabinet, the downstream end of the static switch is connected with the input end of the feeder cabinet through wires, the output end of the UPS bypass voltage stabilizing cabinet is connected with the static switch through a first bypass wire, the upstream end of the inverter is connected with a direct current feeder screen through a second bypass wire, the first bypass wire is provided with a bypass input switch, and the UPS bypass voltage stabilizing cabinet is directly connected with the input end of the feeder cabinet through a third bypass wire. The utility model provides a plurality of bypasses to solve the problem that some equipment of the UPS is suddenly short-circuited and cannot supply power, thereby improving the power supply reliability of the UPS system.

Description

Multi-loop UPS system with short-circuit protection

Technical Field

The utility model relates to the technical field of UPS (uninterrupted Power supply), in particular to a multi-loop UPS system with short-circuit protection.

Background

The UPS uninterrupted power supply is mainly used for providing stable and uninterrupted power supply for network systems or other important instruments such as electric power electronic equipment, e.g. mining machines, motor equipment and the like. When the commercial power is interrupted (such as power failure), the UPS immediately uses the direct current energy of the built-in battery to continuously supply 220V alternating current to the equipment, so that the equipment can maintain normal operation, and the software and hardware of the equipment are protected from being damaged. When an online UPS power source is overloaded, a bypass command, an inverter is overheated, or a machine fails, the UPS power source typically converts the inverted output to a bypass power source output through a static switch. Although the power supply can be switched to the bypass power supply in time to supply power when the main power supply is powered off, the UPS system cannot be switched or can not be switched to the bypass power supply in time to supply power when the static switch has the problems of short circuit and the like, or the rectifier equipment of the bypass power supply cannot supply power when the rectifier equipment of the bypass power supply is short-circuited.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a multi-loop UPS system with short-circuit protection.

The aim of the utility model is realized by the following technical scheme:

the utility model provides a multiloop UPS system with short-circuit protection, includes factory building main power supply and factory building stand-by power supply, still includes the UPS main cabinet that is connected with factory building main power supply electricity, the UPS bypass steady voltage cabinet and the feeder cabinet that are connected with factory building stand-by power supply electricity, is equipped with rectifier, dc-to-ac converter and the static switch that connect gradually through the electric wire in the UPS main cabinet, the low reaches of static switch passes through electric wire connection with the input of feeder cabinet, the output of UPS bypass steady voltage cabinet is connected with static switch through first bypass electric wire, the upper reaches of dc-to-ac converter is connected with the direct current feed screen through the second bypass electric wire, is equipped with main output switch on the output of UPS main cabinet, be equipped with bypass input switch on the first bypass electric wire, the UPS bypass steady voltage cabinet is directly connected with the input of feeder cabinet through the third bypass electric wire.

In the above summary, further, the UPS bypass voltage stabilizing cabinet is connected to a bypass isolation transformer and a voltage regulator in sequence through wires.

In the above summary of the utility model, further, a first DCS control cabinet is electrically connected between the plant main power supply and the UPS main cabinet, a second DCS control cabinet is electrically connected between the plant standby power supply and the UPS bypass voltage regulator cabinet, and a third DCS control cabinet is electrically connected to an upstream end of a second bypass wire connected to the dc power supply.

In the above summary, further, an upstream end of the rectifier is connected with an input isolation transformer, and an upstream end of the static switch is connected with an output isolation transformer.

In the above summary, further, a transmitter for monitoring the current and voltage of the feeder cabinet is further disposed in the feeder cabinet.

In the above summary, further, a non-return diode is disposed on the second bypass line.

The beneficial effects of the utility model are as follows:

the utility model is connected with the UPS bypass voltage stabilizing cabinet through the first bypass, and meanwhile, the output end of the UPS bypass voltage stabilizing cabinet is directly connected with the input end of the feeder cabinet through the third bypass wire, when equipment such as a static switch or a rectifier in the UPS main cabinet has problems, the equipment can be directly communicated with the third bypass wire to supply power to the working equipment, and meanwhile, the equipment in the UPS main cabinet is also convenient to maintain;

the utility model is also connected with a direct current feed screen at the upstream end of the inverter through a second bypass wire, and if the rectifier in the UPS main cabinet has short circuit and the transformer in the UPS bypass voltage stabilizing cabinet has faults such as short circuit, the direct current feed screen can be used for directly conveying 220V voltage.

The utility model provides a plurality of bypasses to solve the problem that some equipment of the UPS is suddenly short-circuited and cannot supply power, thereby greatly reducing the power failure and improving the power supply reliability of the UPS system.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

In the figure, a 1-factory building main power supply, a 2-factory building standby power supply, a 3-direct current feeder screen, a 4-UPS main cabinet, a 5-UPS bypass voltage stabilizing cabinet, a 6-feeder cabinet, a 7-rectifier, an 8-inverter, a 9-static switch, a 10-first bypass wire, a 11-second bypass wire, a 12-third bypass wire, a 13-bypass isolation transformer, a 14-voltage regulator, a 15-input isolation transformer, a 16-output isolation transformer, a 17-bypass input switch, a 18-main output switch, a 19-transmitter and a 20-reverse diode.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

Examples:

in the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must be provided with a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to fig. 1, a multi-loop UPS system with short-circuit protection includes a main power supply 1 and a standby power supply 2, a UPS main cabinet 4 electrically connected to the main power supply 1, a UPS bypass voltage regulator 5 electrically connected to the standby power supply 2, and a feeder cabinet 6, wherein a rectifier 7, an inverter 8, and a static switch 9 sequentially connected through wires are disposed in the UPS main cabinet 4, a downstream end of the static switch 9 is connected to an input end of the feeder cabinet 6 through wires, an output end of the UPS bypass voltage regulator 5 is connected to the static switch 9 through a first bypass wire 10, an upstream end of the inverter 8 is connected to a dc feeder screen 3 through a second bypass wire 11, a main output switch 18 is disposed on an output end of the UPS main cabinet 4, a bypass input switch 17 is disposed on the first bypass wire 10, and the UPS bypass voltage regulator 5 is directly connected to an input end of the feeder cabinet 6 through a third bypass wire 12. Specifically, when the UPS main cabinet 4 is normally powered, the first bypass wire 10 and the third bypass wire 12 are in an off state, and at this time, the static switch 9 is connected to the main circuit of the UPS main cabinet 4, the rectifier 7 converts the 380V ac power accessed from the plant main power supply 1 into dc power, and then supplies the dc power to the inverter 8, and then converts the dc power into 220V ac power through the inverter 8 for supplying to the working equipment.

In the above embodiment, preferably, the bypass isolation transformer 13 and the voltage regulator 14 are sequentially connected to the UPS bypass voltage regulator 5 through wires. Specifically, the bypass isolation transformer 13 can effectively perform a good filtering function on the input end (the power voltage supplied by the power grid) of the transformer, so that pure power voltage is provided for electric equipment, and the power quality is improved. The voltage regulator 14 can regulate the voltage and current applied to the load, and because the voltage applied to the load is 220V, in order to prevent the system voltage from being reduced during the transmission process, the voltage regulator 14 is arranged in the UPS bypass regulator 5.

In the above embodiment, preferably, a first DCS control cabinet is electrically connected between the plant main power supply 1 and the UPS main cabinet 4, a second DCS control cabinet is electrically connected between the plant standby power supply 2 and the UPS bypass voltage regulator cabinet 5, and a third DCS control cabinet is electrically connected to an upstream end of the second bypass wire 11 connected to the dc feeder screen 3. The first DCS control cabinet, the second DCS control cabinet and the third DCS control cabinet can play a role in monitoring the switch on the circuit beside the main circuit.

An input isolation transformer 15 is connected to the upstream end of the rectifier 7, and an output isolation transformer 16 is connected to the upstream end of the static switch 9. The input isolation transformer 15 and the output isolation transformer 16 have the same function as the bypass isolation transformer 13 in the UPS bypass voltage stabilizing cabinet 5, and have good filtering function on the power supply voltage, so that pure power supply voltage is provided for electric equipment, and the power quality is improved.

In the above embodiment, preferably, a transmitter 19 for detecting the current and voltage of the feeder cabinet 6 is further disposed in the feeder cabinet 6.

In the above embodiment, the second bypass wire 11 is preferably provided with a non-return diode 20. The power plant is controlled by a direct current screen because of various reasons such as complex power environment of the power plant, the direct current bus voltage 220V is actually needed by the special UPS of the power plant, and the single-phase UPS is output, but the part corresponding to the battery is directly born by the direct current screen, so that the rectifier 7 is not allowed to charge the direct current screen, and a non-return diode 20 is added when the UPS is used by the power plant.

The specific implementation process comprises the following steps:

when the UPS main cabinet 4 supplies power normally, the first bypass wire 10, the second bypass wire 11 and the third bypass wire 12 are in the disconnected state, the main output switch 18 is in the connected state, the static switch 9 is communicated with the main circuit of the UPS main cabinet 4, the rectifier 7 converts 380V ac power from the main power supply 1 into dc power and supplies the dc power to the inverter 8, the inverter 8 converts the dc power into 220V ac power to supply the ac power to the feeder, and the feeder cabinet 6 transmits the ac power to the power plant for important ac composite use.

When the rectifier 7 or the input isolation transformer 15 in the UPS main cabinet 4 is short-circuited, the second bypass wire 11 may be connected, and direct current of 220V may be directly input through the dc feeder panel 3 to be supplied to the inverter 8.

If the inverter 8 or the output isolation transformer 16 is short-circuited, the direct current feed screen 3 cannot directly supply power, and at the moment, the static switch 9 jumps to the first bypass wire 10 to be communicated with the UPS bypass regulator 5, and the bypass input switch 17 is communicated to supply power through the UPS bypass regulator 5 and the UPS bypass regulator 5.

If the static switch 9 and the first bypass electric wire 10 are short-circuited, the main output switch 18 is disconnected at the moment, and the third bypass electric wire 12 is communicated, so that the plant standby power supply 2 is directly connected with the input end of the feeder cabinet 6 through the UPS bypass voltage stabilizing cabinet 5 and the third bypass electric wire 12, and further the power plant is powered. When the circuit is short-circuited, the utility model provides a plurality of bypasses to solve the problem that the sudden short circuit cannot supply power, thereby avoiding the damage of the circuit and the equipment caused by the short circuit and improving the power supply reliability of the UPS system.

The foregoing examples merely illustrate specific embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims

1. The utility model provides a multiloop UPS system with short-circuit protection, includes factory building main power supply (1) and factory building stand-by power supply (2), its characterized in that still includes UPS main cabinet (4) that are connected with factory building main power supply (1), UPS bypass steady voltage cabinet (5) and feeder cabinet (6) that are connected with factory building stand-by power supply (2) electricity, be equipped with rectifier (7), dc-to-ac converter (8) and static switch (9) that connect gradually through the electric wire in UPS main cabinet (4), the low reaches of static switch (9) pass through electric wire connection with the input of feeder cabinet (6), the output of UPS bypass steady voltage cabinet (5) is connected with static switch (9) through first bypass electric wire (10), the upper reaches of dc-to-ac converter (8) are connected with direct current feed screen (3) through second bypass electric wire (11), are equipped with main output switch (18) on the output of UPS main UPS (4), are equipped with bypass input switch (17) on first bypass electric wire (10), bypass cabinet (5) pass through third bypass electric wire (12) and feeder cabinet (6) direct connection.

2. The multi-loop UPS system with short-circuit protection according to claim 1, wherein a bypass isolation transformer (13) and a voltage regulator (14) are sequentially connected in the UPS bypass voltage regulator (5) through wires.

3. The multi-loop UPS system with short-circuit protection according to claim 2, wherein a first DCS control cabinet is electrically connected between the main power source (1) of the plant and the UPS main cabinet (4), a second DCS control cabinet is electrically connected between the standby power source (2) of the plant and the UPS bypass voltage regulator (5), and a third DCS control cabinet is electrically connected to an upstream end of a second bypass wire (11) connected to the dc power supply panel (3).

4. A multi-loop UPS system with short-circuit protection according to claim 1, wherein an input isolation transformer (15) is connected to the upstream end of the rectifier (7), and an output isolation transformer (16) is connected to the upstream end of the static switch (9).

5. A multi-loop UPS system with short-circuit protection according to claim 1, wherein a transmitter (19) for monitoring the current voltage of the feeder cabinet (6) is further provided in the feeder cabinet (6).

6. A multi-circuit UPS system with short-circuit protection according to claim 1, wherein the second bypass line (11) is provided with a backstop diode (20).