CN221202219U - Uninterrupted power double-switching direct-current power supply device - Google Patents
Uninterrupted power double-switching direct-current power supply device Download PDFInfo
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- CN221202219U CN221202219U CN202321581789.5U CN202321581789U CN221202219U CN 221202219 U CN221202219 U CN 221202219U CN 202321581789 U CN202321581789 U CN 202321581789U CN 221202219 U CN221202219 U CN 221202219U
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Abstract
The utility model discloses a double-switching direct current power supply device without power failure, which relates to the technical field of electric equipment of a substation and comprises at least two sets of direct current power supply devices, wherein each direct current power supply device is provided with a direct current bus, and the direct current buses of two adjacent direct current power supply devices are connected with each other through a bus connecting switch; the power supply device also comprises a plurality of loads, and the direct current buses of the power supply devices are connected to each load through load switches. According to the utility model, the bus tie switch is added between the direct current buses of the adjacent direct current power supply devices, and meanwhile, the direct current buses of the direct current power supply devices are connected to each load through the load switch, so that all loads can take electricity from the direct current power supply devices; and when any power supply device fails, the load switch can protect the load from being influenced by a fault power supply and isolate the fault to ensure the normal operation of the system, so that the fault point of the direct current power supply device can be searched without power failure, the power failure risk is effectively avoided, and the safety of personnel overhaul is ensured.
Description
Technical Field
The utility model relates to the technical field of electric equipment of a substation, in particular to a double-switching direct-current power supply device without power failure.
Background
The direct current power supply device is a power supply required by a tripping and closing loop, a relay protection, an automatic device loop, a signal loop, a monitoring system and other secondary loops of a high-voltage circuit breaker of a power system. At present, a direct current power supply device is widely used in power plants and power stations, has wide distribution range and various loops, and is easy to cause faults. The most common faults are direct current system grounding faults, and the common processing method is to adopt pull Lu Fa, namely, the fault points are searched for on each load by pulling the circuit and cutting off the power; referring to fig. 1, conventional dc power supply devices are generally independent of each other, and when a dc bus or a dc power supply device is failed and needs to be powered off for maintenance, loads are all required to be powered off together. During the power failure maintenance, the load equipment may not normally operate, thereby causing production interruption or data loss; and monitoring systems, protection devices, automatic devices and the like which rely on the direct current power supply for power supply can fail, thereby increasing the safety risks of personnel and equipment.
Therefore, at present, two sets of direct current power supply devices which are standby are arranged in the large multi-transformer power station, and a bus tie switch is arranged between the two sets of direct current power supply devices, when one set of direct current power supply device fails, the load carried by the large multi-transformer power station can be driven by the other set of direct current power supply device through the bus tie switch and kept running. However, only one bus tie switch is arranged to realize the function of switching between two sets of direct current power supply devices without power failure, so that the reliability of the system operation cannot be ensured; when the direct current grounding fault alarms, the fault point needs to be found through pulling Lu Fa, the fault of the device itself needs to be overhauled by power failure, and then the load carried by the direct current power supply device cannot work normally.
Disclosure of Invention
The utility model provides a double-switching direct current power supply device without power failure, which mainly aims to solve the problems existing in the prior art.
The utility model adopts the following technical scheme:
the uninterrupted power double-switching direct current power supply device comprises at least two sets of direct current power supply devices, wherein each direct current power supply device is provided with a direct current bus, and the direct current buses of two adjacent direct current power supply devices are connected with each other through a bus tie switch; the direct current bus of each power supply device is connected to each load through a load switch.
Further, the number of the direct current power supply devices is two, the two direct current power supply devices are a first direct current power supply device and a second direct current power supply device respectively, the first direct current power supply device is provided with a first direct current bus, the second direct current power supply device is provided with a second direct current bus, and the first direct current bus and the second direct current bus are connected with each other through a bus interconnection switch.
Further, the first direct current power supply device and the second direct current power supply device are both provided with a plurality of loads; the load switch comprises a first load switch and a second load switch, and each load is connected to the first direct current bus through the first load switch and connected to the second direct current bus through the second load switch.
Further, each of the dc power supply devices is provided with a dc output switch, a rectifier, and an ac input switch, which are sequentially connected to the dc bus.
Compared with the prior art, the utility model has the beneficial effects that:
The utility model provides a double-switching direct current power supply device without power failure, which is characterized in that a bus tie switch is added between direct current buses of adjacent direct current power supply devices, and meanwhile, the direct current buses of all the direct current power supply devices are connected with each load through a load switch, so that all the loads can take electricity from all the direct current power supply devices; and when any load or any set of direct current power supply device is in direct current grounding, each load is switched to the adjacent direct current power supply device for power supply through a bus tie switch and a load switch without power failure, so that the direct current grounding point is searched without power failure, the power failure risk is effectively avoided, in addition, when any set of direct current power supply device is required to be overhauled due to faults, all loads carried by the direct current power supply device can be transferred to the adjacent direct current power supply device, and the fault device can be completely powered off to exit from operation and maintenance, thereby ensuring the safety of overhaulers and avoiding the power interruption of the loads.
Drawings
Fig. 1 is a schematic circuit diagram of a conventional dc power supply device.
Fig. 2 is a schematic circuit structure of the present utility model.
Detailed Description
Specific embodiments of the present utility model will be described below with reference to the accompanying drawings. Numerous details are set forth in the following description in order to provide a thorough understanding of the present utility model, but it will be apparent to one skilled in the art that the present utility model may be practiced without these details.
Referring to fig. 1 and 2, a double-switching dc power supply device without power outage includes at least two dc power supply devices, each of which is provided with a dc bus, and the dc buses of two adjacent dc power supply devices are connected to each other by a bus tie switch; the power supply device also comprises a plurality of loads, and the direct current buses of the power supply devices are connected to each load through load switches.
Referring to fig. 1 and 2, preferably, in this example, the number of dc power supply devices is two, and the two dc power supply devices are a first dc power supply device and a second dc power supply device, where the first dc power supply device is provided with a first dc bus L1, and the second dc power supply device is provided with a second dc bus L2, and the first dc bus L1 and the second dc bus L2 are connected to each other by a bus interconnection switch QF 01. Further, the first direct current power supply device and the second direct current power supply device are provided with a plurality of loads; the load switch comprises a first load switch and a second load switch, and each load is connected to the first direct current bus L1 through the first load switch and connected to the second direct current bus L2 through the second load switch. In order to simplify the scheme, for the sake of clarity and intuition, in this embodiment, only one load is respectively configured for each set of dc power supply device, that is, the first dc power supply device is configured with a first load, the second dc power supply device is configured with a second load, and the first load is connected to the first dc bus L1 through the first load switch 1QF13 and is connected to the second dc bus L2 through the second load switch 2QF 23; the second load is connected to the second dc bus L2 via the first load switch 2QF24 and to the first dc bus L1 via the second load switch 1QF 14.
Referring to fig. 1 and 2, each dc power supply device is provided with a dc output switch, a rectifier, and an ac input switch, which are sequentially connected to a dc bus. Specifically, the first direct current power supply device is provided with a direct current output switch QF12, a first rectifier and an alternating current input switch QF11 which are sequentially connected to a first direct current bus L1; the second dc power supply device is provided with a dc output switch QF22, a second rectifier and an ac input switch QF21, which are sequentially connected to the second dc bus L2.
With reference to fig. 1 and 2, a specific switching method between the first dc power supply device and the second dc power supply device will be described below based on the present utility model:
(1) In a normal state, a bus tie switch QF01 between a first direct current bus L1 and a second direct current bus L2 is disconnected, the first direct current power supply device and the second direct current power supply device operate with respective loads, namely an alternating current input switch QF11, a direct current output switch QF12 and a first load switch 1QF13 of a first load are closed, the first load operates, and a second load switch 2QF23 of the first load is disconnected for standby; similarly, the ac input switch QF21, the dc output switch QF22, and the first load switch 2QF24 of the second load are turned on, the second load is operated, and the second load switch 1QF14 of the second load is turned off for standby.
(2) When the ground fault of the first direct current power supply device alarms, a bus tie switch QF01 is firstly closed, a first direct current bus L1 output by the first direct current power supply device and a second direct current bus L2 output by the second direct current power supply device are operated in parallel, a second load switch 2QF23 of a first load is combined, and finally a first load switch 1QF13 of the first load and the bus tie switch QF01 are disconnected; similarly, when the ground fault of the second dc power supply unit is alarmed, the busbar tie switch QF01 is turned on, the first dc busbar L1 output by the first dc power supply unit and the second dc busbar L2 output by the second dc power supply unit are operated in parallel, the second load switch 1QF14 of the second load is turned on, and finally the first load switch 2QF24 and the busbar tie switch QF01 of the second load are turned off.
By the operation method, the first load carried by the first direct current power supply device can be switched and connected to the second direct current power supply device without power failure, and the first direct current power supply device can be switched out for maintenance in all power failure and can carry out power failure-free pull-out for finding a grounding point; or the second load carried by the second direct current power supply device is switched and connected to the first direct current power supply device without power failure, the second direct current power supply device can be completely powered off, cut out and overhauled, and the carried load is pulled without power failure to find a grounding point, so that the device has the double switching function without power failure, effectively avoids the power failure risk, and is convenient for personnel to overhaul equipment and find the grounding fault point.
The foregoing is merely illustrative of specific embodiments of the present utility model, but the design concept of the present utility model is not limited thereto, and any insubstantial modification of the present utility model by using the design concept shall fall within the scope of the present utility model.
Claims (2)
1. The utility model provides a double-switch DC power supply device does not have a power failure which characterized in that: the direct current power supply device comprises at least two sets of direct current power supply devices, wherein each direct current power supply device is provided with a direct current bus, and the direct current buses of two adjacent direct current power supply devices are connected with each other through a bus tie switch; the direct current buses of the power supply devices are connected to each load through load switches; the number of the direct current power supply devices is two, the two direct current power supply devices are a first direct current power supply device and a second direct current power supply device respectively, the first direct current power supply device is provided with a first direct current bus, the second direct current power supply device is provided with a second direct current bus, and the first direct current bus and the second direct current bus are connected with each other through a bus connecting switch; the first direct current power supply device and the second direct current power supply device are provided with a plurality of loads; the load switch comprises a first load switch and a second load switch, and each load is connected to the first direct current bus through the first load switch and connected to the second direct current bus through the second load switch.
2. The uninterruptible double-switching direct-current power supply device according to claim 1, wherein: each direct-current power supply device is provided with a direct-current output switch, a rectifier and an alternating-current input switch which are sequentially connected to the direct-current bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321581789.5U CN221202219U (en) | 2023-06-20 | 2023-06-20 | Uninterrupted power double-switching direct-current power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321581789.5U CN221202219U (en) | 2023-06-20 | 2023-06-20 | Uninterrupted power double-switching direct-current power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221202219U true CN221202219U (en) | 2024-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321581789.5U Active CN221202219U (en) | 2023-06-20 | 2023-06-20 | Uninterrupted power double-switching direct-current power supply device |
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| Country | Link |
|---|---|
| CN (1) | CN221202219U (en) |
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2023
- 2023-06-20 CN CN202321581789.5U patent/CN221202219U/en active Active
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