CN217216083U

CN217216083U - Power supply system of automatic bus transfer device

Info

Publication number: CN217216083U
Application number: CN202220004553.4U
Authority: CN
Inventors: 吴磊
Original assignee: PowerChina Chengdu Engineering Co Ltd
Current assignee: PowerChina Chengdu Engineering Co Ltd
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-08-16
Anticipated expiration: 2032-01-04

Abstract

The utility model relates to a stand-by power supply technical field for reduce the equipment investment, reduces the maintenance work volume, provides a spare power automatic switching device power supply system, including the third circuit breaker, spare power automatic switching device, first power, first transformer, first circuit breaker and the first generating line of establishing ties in proper order and the second power, second transformer, second circuit breaker and the second generating line of establishing ties in proper order, first generating line passes through the third circuit breaker with the second generating line and is connected, still includes power module, first air switch, second air switch and third air switch, power module is connected through the low pressure side of first air switch with first transformer, is connected through the low pressure side of second air switch with the second transformer, is connected through third air switch and spare power automatic switching device. By adopting the structure, the equipment investment and the maintenance workload are reduced.

Description

Power supply system of automatic bus transfer device

Technical Field

The utility model relates to a stand-by power supply technical field specifically is a spare power automatic switching device power supply system.

Background

The automatic standby power switching device is a device for automatically switching a standby power supply. The existing 400V spare power automatic switching device power supply usually needs to be configured with an external uninterrupted power supply or a direct current power supply, the adoption of the mode increases equipment investment, and the external uninterrupted power supply or the direct current power supply needs to be regularly maintained, so that a charge and discharge test is carried out on a storage battery, the characteristics of the storage battery are checked, and the workload of operation and maintenance is greatly increased. Particularly, when the 400V automatic backup power switching device is configured in a far isolated power supply network, according to the existing power supply mode, only an uninterruptible power supply or a direct-current power supply can be configured for the automatic backup power switching device independently, and the cost performance of equipment investment is low. The power supply of the conventional backup automatic switching device is shown in fig. 1.

SUMMERY OF THE UTILITY MODEL

In order to reduce equipment investment, reduce maintenance work load, the utility model provides a spare power automatic switching device power supply system.

The utility model provides a technical scheme that above-mentioned problem adopted is:

the power supply system of the spare power automatic switching device comprises a third circuit breaker, the spare power automatic switching device, a first power supply, a first transformer, a first circuit breaker and a first bus which are sequentially connected in series, and a second power supply, a second transformer, a second circuit breaker and a second bus which are sequentially connected in series, wherein the first bus is connected with the second bus through the third circuit breaker.

Further, the power module comprises a first rectifying circuit, a first diode, a second rectifying circuit and a second diode, the first air switch is connected with the first rectifying circuit, the second air switch is connected with the second rectifying circuit, the first rectifying circuit is connected to the third air switch through the first diode, and the second rectifying circuit is connected to the third air switch through the second diode.

The utility model discloses compare the beneficial effect who has in prior art is: the direct power supply circuit is directly connected with the existing power supply circuit, an additional direct-current power supply or an uninterruptible power supply does not need to be additionally arranged, the cost is saved, the maintenance workload is reduced, and the application range is wider.

Drawings

Fig. 1 is a schematic diagram of a power supply structure of a backup power automatic switching device in the prior art;

fig. 2 is a schematic diagram of a power supply structure of the backup power automatic switching device of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 2, the power supply system of the automatic backup power switching device comprises a third circuit breaker 3DL, an automatic backup power switching device, a first power supply, a first transformer 1B, a first circuit breaker 1DL and a first bus I bus which are sequentially connected in series, and a second power supply, a second transformer 2B, a second circuit breaker 2DL and a second bus II bus which are sequentially connected in series, wherein the first bus I bus and the second bus II bus are connected through the third circuit breaker 3DL, the automatic backup power switching device further comprises a power module, a first air switch 1KK, a second air switch 2KK and a third air switch 3KK, the power module is connected with the low voltage side of the first transformer 1B through the first air switch 1KK, is connected with the low voltage side of the second transformer 2B through the second air switch 2KK, and is connected with the automatic backup power switching device through the third air switch 3 KK.

Specifically, the power module includes first rectifier circuit, first diode, second rectifier circuit and second diode, first air switch 1KK is connected with first rectifier circuit, second air switch 2KK is connected with second rectifier circuit, first rectifier circuit is connected to third air switch 3KK through first diode, and second rectifier circuit is connected to third air switch 3KK through the second diode.

The improved power supply scheme enables the power supply of the spare power automatic switching device to be taken from a 400V side electric main loop of the transformer, any phase voltage can be extracted, an AC220V alternating current power supply is led out, the alternating current power supply is rectified into a DC220V direct current power supply through 2 groups of rectifying circuits, and mutually spare uninterrupted power supplies are provided for the device.

And (3) analyzing the working condition:

the first condition is as follows: two power supply systems are in independent operation in a split-column mode, a first breaker 1DL and a second breaker 2DL are in a closed position, a third breaker 3DL is in a split position, when the first power supply fails, the first breaker 1DL needs to be correspondingly disconnected, then the third breaker 3DL is closed, a second power supply is put into the first power supply, and the power supply of a load on a bus is ensured. When the first power supply fails and loses power, the spare power automatic switching device can still obtain uninterrupted power supply from the second power supply, the power problem of the electric main loop has no influence on the device, the device still keeps normal work, and the switching of the corresponding circuit breaker on the electric main loop can be accurately completed.

Case two: one power supply system runs in parallel, the other power supply system stops running, the first breaker 1DL and the third breaker 3DL are in the closed position, and the second breaker 2DL is in the separated position. When the first power supply fails to supply power, the second power supply is in a shutdown state, the spare power automatic switching device does not need to switch a main loop circuit breaker, and the spare power automatic switching device does not have any influence on a power supply system when the spare power automatic switching device loses power.

The principle of the second power failure is as the first power, and is not described herein. Through the analysis to various operating modes, the spare power automatic switching device with the power module is wider in application range.

Claims

1. The power supply system of the spare power automatic switching device comprises a third circuit breaker, the spare power automatic switching device, a first power supply, a first transformer, a first circuit breaker and a first bus which are sequentially connected in series, and a second power supply, a second transformer, a second circuit breaker and a second bus which are sequentially connected in series, wherein the first bus is connected with the second bus through the third circuit breaker.

2. The power supply system of the automatic standby device according to claim 1, wherein the power supply module comprises a first rectifying circuit, a first diode, a second rectifying circuit and a second diode, the first air switch is connected to the first rectifying circuit, the second air switch is connected to the second rectifying circuit, the first rectifying circuit is connected to the third air switch through the first diode, and the second rectifying circuit is connected to the third air switch through the second diode.