Double-loop double-power-supply low-voltage power supply device

Abstract

The utility model relates to a double-loop double-power-supply low-voltage power supply device. In order to overcome the defects in the prior art, the double-loop double-power-supply low-voltage power supply device comprises two transformers and a low-voltage cable busbar, the high-voltage sides of the two transformers are respectively connected with a high-voltage cable, and the load sides of the two transformers are respectively connected with the low-voltage cable busbar through a change-over switch. The change-over switch comprises two automatic change-over switches and four knife switches, and a group of input end terminals of the two automatic change-over switches are respectively connected with a load side coil of a transformer through the knife switches. And the other group of input end terminals of the two automatic change-over switches are respectively connected with a load side coil of the other transformer through a knife switch, the output end terminals of the two automatic change-over switches are respectively connected with a low-voltage cable busbar, and the two groups of low-voltage cable busbars are connected through a lead which is connected in series with a circuit breaker and a circuit breaker switch. The utility model has the advantages of simple structure, convenient wiring and reliable power supply, and is suitable for low-voltage electric equipment.

Description

Technical Field

[0001] This utility model relates to a dual-circuit dual-power low-voltage power supply device. Background Technology

[0002] In the installation of low-voltage power supply cabinets, the common practice is to connect two low-voltage cable busbars using a connecting device to achieve dual power supply for the dual-circuit low-voltage cabinet. When one of the low-voltage cabinets fails to supply power, the other low-voltage cabinet can be powered through the connecting device. However, this power supply method has a problem: if the connecting device fails to close properly at the same time as the power supply failure of one of the low-voltage cabinets, neither of the two low-voltage cabinets can work properly. Summary of the Invention

[0003] The technical problem to be solved by this utility model is how to overcome the above-mentioned defects of the prior art and provide a dual-circuit dual-power low-voltage power supply device.

[0004] To solve the above-mentioned technical problems, this dual-circuit dual-power low-voltage power supply device includes two transformers and low-voltage cable busbars. The two transformers each include a high-voltage side coil and a load side coil. The high-voltage side coils of the two transformers are each connected to a high-voltage cable. The load side coils of the two transformers are each connected to the low-voltage cable busbars through switching switches. The switching switches include two automatic switching switches and four knife switches. Each automatic switching switch has two sets of input terminals and one set of output terminals. One set of input terminals of the two automatic switching switches is connected to the load side coil of one transformer through a knife switch. The other set of input terminals of the two automatic switching switches is connected to the load side coil of the other transformer through a knife switch. The low-voltage cable busbars have two circuits. The output terminals of the two automatic switching switches are each connected to one low-voltage cable busbar. The two sets of low-voltage cable busbars are connected by wires with circuit breakers and circuit switches connected in series.

[0005] With this design, each transformer can simultaneously supply power to two low-voltage cable busbars (i.e., low-voltage cabinets), or two transformers can supply power to two sets of low-voltage cable busbars individually, one-to-one. When one low-voltage cable busbar fails, the circuit breaker can automatically disconnect the connection between the two sets of low-voltage cable busbars (or the circuit breaker can be manually disconnected), so that the other low-voltage cable busbar can still operate normally.

[0006] As an optimization, the low-voltage cable busbar is connected to the output terminal of the automatic transfer switch by bolts. This design ensures a secure connection and full contact.

[0007] This utility model of a dual-circuit dual-power low-voltage power supply device has the advantages of simple structure, convenient wiring, and reliable power supply, and is suitable for low-voltage electrical equipment. Attached Figure Description

[0008] The following description, in conjunction with the accompanying drawings, further illustrates the dual-circuit, dual-power low-voltage power supply device of this utility model:

[0009] Figure 1 This is a schematic diagram of the circuit structure of this dual-circuit, dual-power low-voltage power supply device.

[0010] In the diagram: 1 is a transformer, 2 is a low-voltage cable busbar, 3 is a high-voltage cable, 4 is a low-voltage cable, 5 is an automatic transfer switch, 6 is a knife switch, 7 is a circuit breaker, and 8 is a circuit breaker. Detailed Implementation

[0011] Implementation method one: such as Figure 1 As shown, this dual-circuit dual-power low-voltage power supply device includes two transformers 1 and a low-voltage cable busbar 2. The two transformers 1 each include a high-voltage side coil and a load side coil. The high-voltage side coils of the two transformers 1 are each connected to a high-voltage cable 3. The load side coils of the two transformers 1 are each connected to the low-voltage cable busbar 2 through a switching switch and a low-voltage cable 4. The switching switch includes two automatic switching switches 5 and four knife switches 6. Each automatic switching switch 5 has two sets of input terminals and one set of output terminals. One set of input terminals of the two automatic switching switches 5 is connected to the load side coil of one transformer 1 through a knife switch 6. The other set of input terminals of the two automatic switching switches 5 is connected to the load side coil of the other transformer 1 through a knife switch 6. The low-voltage cable busbar 2 has two circuits. The output terminals of the two automatic switching switches 5 are each connected to one low-voltage cable busbar 2. The two sets of low-voltage cable busbars 2 are connected by a wire with a circuit breaker 7 and a circuit breaker 8 connected in series.

[0012] The circuit breaker 7 is preferably a circuit breaker with an alarm function (such as CN216528612U).

[0013] The low-voltage cable busbar 2 is connected to the output terminal of the automatic transfer switch 5 by bolts.

Claims

1. A dual-circuit, dual-power low-voltage power supply device, comprising two transformers and a low-voltage cable busbar, wherein each transformer includes a high-voltage side coil and a load side coil, the high-voltage side coils of the two transformers are respectively connected to a high-voltage cable, and the load side coils of the two transformers are respectively connected to the low-voltage cable busbar via switching switches, characterized in that: The switching system includes two automatic switching switches and four knife switches. Each automatic switching switch has two sets of input terminals and one set of output terminals. One set of input terminals of the two automatic switching switches is connected to the load side coil of a transformer through a knife switch. The other set of input terminals of the two automatic switching switches is connected to the load side coil of another transformer through a knife switch. There are two low-voltage cable busbars. The output terminals of the two automatic switching switches are connected to one low-voltage cable busbar. The two sets of low-voltage cable busbars are connected by wires with a circuit breaker and a circuit breaker connected in series.

2. The dual-circuit dual-power low-voltage power supply device according to claim 1, characterized in that: The low-voltage cable busbar is connected to the output terminal of the automatic transfer switch by bolts.

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