Uninterrupted working circuit of low-voltage power distribution system

Abstract

A low-voltage power distribution system uninterrupted working circuit comprises a diesel generator, the diesel generator is connected with a common bus through an inlet wire switch 3DL, one end of the common bus is connected with a first bus through an interconnection switch 4DL, the other end of the common bus is connected with a second bus through an interconnection switch 5DL, the first bus is connected with a first transformer through an inlet wire switch 1DL, and the second bus is connected with a second transformer through an outlet wire switch 1DL. The second bus is connected with a second transformer through a wire inlet switch 2DL; the purpose of the utility model is to guarantee the power supply of each device in the system through the diesel generator under the condition that the mains supply of two sections of buses in a power supply system is cut off, realize the continuous power supply of a load through the interconnection switch when one of the transformers fails, and can effectively solve the problem in some important occasions where the power cannot be cut off. When the two paths of mains supply are powered off, the diesel generator can supply power to equipment through two paths of connection, so that continuous power supply of each load is ensured, and various economic losses caused by power failure are reduced.

Description

Technical Field

[0001] The utility model relates to the field of power distribution cabinets, in particular to an uninterrupted working circuit of a low-voltage power distribution system. Background Art

[0002] The current two-incoming-one-connection solution can guarantee the power supply of each section of equipment when one or two mains are powered. However, when both mains are out of power, the equipment will be unable to be powered, and there is a possibility of a complete power outage. Utility Model Content

[0003] In order to solve the above problems, the present technical solution provides an uninterrupted working circuit for a low-voltage power distribution system.

[0004] To achieve the above purpose, the technical solution is as follows:

[0005] A low-voltage power distribution system uninterrupted working circuit, comprising a diesel generator, the diesel generator is connected to a common bus through an incoming switch 3DL, one end of the common bus is connected to a first bus through a connecting switch 4DL, and the other end is connected to a second bus through a connecting switch 5DL, the first bus is connected to a first transformer through an incoming switch 1DL, and the second bus is connected to a second transformer through an incoming switch 2DL;

[0006] When the incoming line switch 1DL and the incoming line switch 2DL are closed and the other switches are open, the first transformer and the second transformer supply power to the first bus and the second bus respectively;

[0007] When the incoming switch 1DL, the tie switch 4DL and the tie switch 5DL are closed and the other switches are open, the first transformer supplies power to the first bus and the second bus at the same time;

[0008] When the incoming switch 2DL, the tie switch 4DL and the tie switch 5DL are closed and the other switches are open, the second transformer supplies power to the first bus and the second bus at the same time;

[0009] When the incoming switch 3DL, the connecting switch 4DL and the connecting switch 5DL are closed and the other switches are open, the diesel generator supplies power to the first bus and the second bus at the same time.

[0010] In some embodiments, the incoming line switch 1DL, the incoming line switch 2DL, the incoming line switch 3DL, the connecting switch 4DL and the connecting switch 5DL are electrically interlocked.

[0011] In some embodiments, the first bus is connected to the load via a plurality of switches, and the second bus is connected to the load via a plurality of switches.

[0012] The beneficial effects of this application are:

[0013] The purpose of this application is to ensure the power supply of various equipment in the system through a diesel generator when both busbar mains power in the power supply system are out of power. When one of the transformers fails, continuous power supply to the load is achieved through a connecting switch. For some important occasions where power outages are not allowed, the utility model can effectively solve this problem. When both mains power is out of power, the diesel generator can supply power to the equipment through the two connections, thereby ensuring continuous power supply to each load and reducing various economic losses caused by power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] Please refer to Figure 1 As shown, a low-voltage power distribution system uninterrupted working circuit includes a diesel generator, the diesel generator is connected to a common bus through an incoming switch 3DL, one end of the common bus is connected to a first bus through a connecting switch 4DL, and the other end is connected to a second bus through a connecting switch 5DL, the first bus is connected to a first transformer through an incoming switch 1DL, and the second bus is connected to a second transformer through an incoming switch 2DL;

[0018] When the incoming line switch 1DL and the incoming line switch 2DL are closed and the other switches are open, the first transformer and the second transformer supply power to the first bus and the second bus respectively;

[0019] When the incoming switch 1DL, the tie switch 4DL and the tie switch 5DL are closed and the other switches are open, the first transformer supplies power to the first bus and the second bus at the same time;

[0020] When the incoming switch 3DL, the tie switch 4DL and the tie switch 5DL are closed and the other switches are open, the diesel generator supplies power to the first bus and the second bus at the same time;

[0021] When the incoming switch 2DL, the connecting switch 4DL and the connecting switch 5DL are closed and the other switches are open, the second transformer supplies power to the first bus and the second bus at the same time.

[0022] In this embodiment, the incoming line switch 1DL, the incoming line switch 2DL, the incoming line switch 3DL, the connecting switch 4DL and the connecting switch 5DL are electrically interlocked.

[0023] In this embodiment, the first bus is connected to the load through a plurality of switches, and the second bus is connected to the load through a plurality of switches.

[0024] When the G1TM and G2TM transformers are operating normally, the two mains supplies power to the I and II busbars respectively. At this time, switches 1DL and 2DL are in the closed state, and switches 3DL, 4DL, and 5DL are in the open state.

[0025] When one of the G1TM and G2TM transformers is out of power due to maintenance or failure, the other normally working transformer supplies power to bus section I and bus section II. 1) When G1TM is out of power, the switch 1DL is disconnected, the switch 2DL is in the closed state, the switches 4DL and 5DL are closed, the switch 3DL is in the open state, and the 2# transformer supplies power to bus section I and bus section II through the contact switches 4DL and 5DL; 2) When G2TM is out of power, the switch 2DL is disconnected, the switch 1DL is in the closed state, the switches 4DL and 5DL are closed, the switch 3DL is in the open state, and the 1# transformer supplies power to bus section I and bus section II through the contact switches 4DL and 5DL.

[0026] When the G1TM and G2TM transformers are out of power due to maintenance or failure, the 1DL and 2DL incoming line switches will send a depressurization trip signal to the generator room to start the diesel generator set. At this time, the switches 1DL and 2DL are turned off, the diesel generator incoming line switch 3DL is closed, and the contact switches 4DL and 5DL are closed. The diesel generator supplies power to the I and II busbars to ensure the continuity of power supply to the load equipment.

[0027] Electrical interlocking must be set between switches 1DL, 2DL, 3DL, 4DL, and 5DL. When 1DL and 2DL are both closed, 3DL, 4DL, and 5DL are not allowed to be closed. When one of 1DL and 2DL is closed, 3DL is not allowed to be closed, but 4DL and 5DL are allowed to be closed. Only when 1DL and 2DL are both in the open state, 3DL, 4DL, and 5DL are allowed to be closed.

[0028] The power distribution system solution of the utility model can not only adopt the method of manually switching each switch, but also adopt a standby automatic switching device to automatically switch each switch according to a set relevant program.

[0029] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Other principles and basic structures that are the same or similar to those of the present application are within the protection scope of the present application.

Claims

1. A low voltage power distribution system uninterrupted working circuit, characterized in that: It includes a diesel generator, which is connected to a common busbar through an incoming switch 3DL, one end of the common busbar is connected to a first busbar through a tie switch 4DL, and the other end is connected to a second busbar through a tie switch 5DL, the first busbar is connected to a first transformer through an incoming switch 1DL, and the second busbar is connected to a second transformer through an incoming switch 2DL; When the incoming line switch 1DL and the incoming line switch 2DL are closed and the other switches are open, the first transformer and the second transformer supply power to the first bus and the second bus respectively; When the incoming switch 1DL, the tie switch 4DL and the tie switch 5DL are closed and the other switches are open, the first transformer supplies power to the first bus and the second bus at the same time; When the incoming switch 2DL, the tie switch 4DL and the tie switch 5DL are closed and the other switches are open, the second transformer supplies power to the first bus and the second bus at the same time; When the incoming switch 3DL, the connecting switch 4DL and the connecting switch 5DL are closed and the other switches are open, the diesel generator supplies power to the first bus and the second bus at the same time.

2. The uninterrupted working circuit of a low voltage power distribution system according to claim 1, characterized in that: The incoming line switch 1DL, the incoming line switch 2DL, the incoming line switch 3DL, the connecting switch 4DL and the connecting switch 5DL are electrically interlocked.

3. The uninterrupted working circuit of a low voltage power distribution system according to claim 2, characterized in that: The first busbar is connected to the load via a plurality of switches, and the second busbar is connected to the load via a plurality of switches.

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