Single-phase transformer bank low-voltage side bus bar arrangement type

Abstract

The utility model relates to a single-phase transformer bank low-voltage side bus bar arrangement type, which comprises a main transformer and a low-voltage side power distribution device wire inlet cabinet, and the main transformer is connected with the low-voltage side power distribution device wire inlet cabinet through a phase-isolated enclosed bus. The main transformer is composed of a T-phase transformer, an S-phase transformer and an R-phase transformer which are sequentially arranged from left to right, and the low-voltage sides of the T-phase transformer, the S-phase transformer and the R-phase transformer are connected with one end of the isolated-phase enclosed bus through a first connecting piece. And the other end of the isolated-phase enclosed bus is connected with a low-voltage side power distribution device incoming cabinet arranged on one side of the R-phase transformer through a second connecting piece. The device has the characteristics of simple structure, compact arrangement, safety in operation, convenience in maintenance, capability of adapting to various weather conditions and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and in particular relates to a low-voltage side busbar arrangement type of a single-phase transformer group. Background Art

[0002] When the substation and new energy system collection station have three voltage levels, the reactive power compensation device and station power supply in the station can be connected to the low-voltage winding of the transformer. Considering the size and weight of the transformer and the transportation and installation problems to the construction site, a single-phase autotransformer group is often used. The three sets of bushings on the high / medium / low voltage side of the transformer need to be sent out separately and connected to the distribution devices of the corresponding voltage levels. When the low-voltage side of the single-phase transformer group adopts a triangle connection, a busbar needs to be set up. It is often combined with an overhead jumper and an outdoor tube busbar. Considering the insulation and electrical safety distance, if the low-voltage side is connected by an overhead jumper-tube busbar method, the following problems usually occur:

[0003] 1. Low reliability. Overhead lines, insulating sleeves and tubular busbars are arranged in the air and are easily affected by environmental factors (such as temperature, humidity, pollution and corrosion) and mechanical external forces. The equipment has a high failure rate and is prone to safety accidents in extreme weather conditions.

[0004] 2. Complex layout. The low-voltage side bushing is connected to the mother pipe through an overhead jumper, which requires additional electrical connection hardware (such as equipment wire clamps, sliding and fixed supports, damping terminal balls), and the electrical safety distance from the high / medium voltage side bushing must be ensured, making the on-site installation and construction process complicated.

[0005] The later maintenance cost is high. The maintenance and upkeep cost of overhead lines and pipe mothers is high in the later operation.

[0006] Therefore, a busbar arrangement type for the low-voltage side of a single-phase transformer group is designed to overcome the above problems. Summary of the invention

[0007] The utility model aims to overcome the deficiencies of the prior art and to provide a low-voltage side busbar arrangement type of a single-phase transformer group which has a simple structure, compact arrangement, safe operation and convenient maintenance.

[0008] The utility model is realized through the following technical scheme: a low-voltage side busbar arrangement type of a single-phase transformer group, comprising a main transformer and a low-voltage side power distribution device incoming cabinet, the main transformer is connected to the low-voltage side power distribution device incoming cabinet through a phase-isolated closed busbar, the main transformer is composed of a T-phase transformer, an S-phase transformer and an R-phase transformer arranged in sequence from left to right, the low-voltage side of the T-phase transformer, the S-phase transformer and the R-phase transformer are connected to one end of the phase-isolated closed busbar through a first connecting piece, and the other end of the phase-isolated closed busbar is connected to the low-voltage side power distribution device incoming cabinet arranged on one side of the R-phase transformer through a second connecting piece.

[0009] As a preferred embodiment: the low-voltage side winding T1 end of the R-phase transformer is connected to the low-voltage side winding T2' end of the S-phase transformer through the phase-isolated closed busbar, and then connected to the R phase of the low-voltage side distribution device incoming cabinet; the low-voltage side winding T2 end of the S-phase transformer is connected to the low-voltage side winding T3' end of the T-phase transformer through the phase-isolated closed busbar, and then connected to the S phase of the low-voltage side distribution device incoming cabinet; the low-voltage side winding T3 end of the T-phase transformer is connected to the low-voltage side winding T1' end of the R-phase transformer through the phase-isolated closed busbar, and then connected to the T phase of the low-voltage side distribution device incoming cabinet; the R / S / T phases of the low-voltage side distribution device incoming cabinet are respectively connected to the medium-voltage cabinet connection terminals through the upper incoming lines.

[0010] Preferably, the first connectors on the low-voltage sides of the T-phase transformer, the S-phase transformer and the R-phase transformer and the second connectors on the isolated-phase closed busbar are all bushings and soft wires.

[0011] Preferably, the T-phase transformer, the S-phase transformer and the R-phase transformer are single-phase autotransformers of high voltage, medium voltage or low voltage.

[0012] Preferably, the low-voltage side power distribution device incoming cabinet is an 11Kv power distribution device incoming cabinet.

[0013] Preferably, the isolated-phase enclosed busbar is installed and arranged by means of steel structure support.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model adopts a phase-isolated enclosed busbar form to avoid the shortcomings of cable laying and operation and maintenance, and reduces the risk of environmental factors to safe power operation; the layout is compact and beautiful, and the phase-isolated enclosed busbar adopts a fully enclosed structure. The busbar is completely isolated from the external environment, which can effectively prevent equipment damage and bushing grounding short-circuit accidents caused by external factors and changes in the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the plane layout of the utility model.

[0017] Figure 2 It is a schematic diagram of the cross-sectional arrangement of the utility model.

[0018] Figure 3 The utility model is a schematic diagram of the low-voltage side connection group of a single-phase transformer. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] In the description of the present invention, it is necessary to understand that the orientation or position relationship indicated by the terms such as "up", "down", "left", "right", "inside", "outside", "horizontal" and "vertical" is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or original referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] The present invention will be described in detail below with reference to the accompanying drawings: Figure 1-2 As shown, a low-voltage side busbar arrangement type of a single-phase transformer group includes a main transformer 1 and a low-voltage side power distribution device incoming cabinet 2. The main transformer 1 is connected to the low-voltage side power distribution device incoming cabinet 2 through a phase-isolated closed busbar 3. The main transformer 1 is composed of a T-phase transformer 4, an S-phase transformer 5 and an R-phase transformer 6 arranged in sequence from left to right. The low-voltage sides of the T-phase transformer 4, the S-phase transformer 5 and the R-phase transformer 6 are connected to one end of the phase-isolated closed busbar 3 through a first connector 7, and the other end of the phase-isolated closed busbar 3 is connected to the low-voltage side power distribution device incoming cabinet 2 arranged on one side of the R-phase transformer 6 through a second connector 8.

[0022] like Figure 3 As shown, the low-voltage side winding T1 end of the R-phase transformer 6 is connected to the low-voltage side winding T2' end of the S-phase transformer 5 through the phase-isolated closed busbar 3, and then connected to the R phase of the low-voltage side distribution device incoming cabinet 2; the low-voltage side winding T2 end of the S-phase transformer 5 is connected to the low-voltage side winding T3' end of the T-phase transformer 4 through the phase-isolated closed busbar 3, and then connected to the S phase of the low-voltage side distribution device incoming cabinet 2; the low-voltage side winding T3 end of the T-phase transformer 4 is connected to the low-voltage side winding T1' end of the R-phase transformer 6 through the phase-isolated closed busbar 3, and then connected to the T phase of the low-voltage side distribution device incoming cabinet 2; the R / S / T phases of the low-voltage side distribution device incoming cabinet 2 are respectively connected to the medium-voltage cabinet connection terminals through the upper incoming lines.

[0023] In the utility model, the bushings at the head and end of the low-voltage side winding of each single-phase transformer are led out respectively, and form a triangle connection form with the head and end of the low-voltage side windings of the other two single-phase transformers.

[0024] The first connecting pieces on the low-voltage sides of the T-phase transformer, the S-phase transformer and the R-phase transformer and the second connecting pieces on the isolated-phase enclosed busbar are all bushings and soft wires.

[0025] The T-phase transformer 4 , the S-phase transformer 5 and the R-phase transformer 6 are single-phase autotransformers of high voltage, medium voltage or low voltage.

[0026] The low-voltage side power distribution device incoming cabinet 2 is an 11Kv power distribution device incoming cabinet. The phase-isolated enclosed busbar 3 is installed and arranged by steel structure support. In order to ensure the airtightness of the phase-isolated enclosed busbar 3, a sleeve can also be provided on the outer shell of the phase-isolated enclosed busbar.

[0027] The utility model adopts the form of phase-separated enclosed busbar to avoid the shortcomings of cable laying and operation and maintenance, and reduces the risk of environmental factors on the safe operation of electricity; the layout is compact and beautiful. The phase-separated enclosed busbar adopts a fully enclosed structure, and the busbar is completely isolated from the external environment, which can effectively prevent equipment damage and casing grounding short-circuit accidents caused by external factors and changes in the external environment.

[0028] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A low-voltage side busbar arrangement of a single-phase transformer group, comprising a main transformer (1) and a low-voltage side power distribution device incoming line cabinet (2), wherein the main transformer (1) is connected to the low-voltage side power distribution device incoming line cabinet (2) via a phase-isolated closed busbar (3), characterized in that: The main transformer (1) is composed of a T-phase transformer (4), an S-phase transformer (5) and an R-phase transformer (6) arranged in sequence from left to right, wherein the low-voltage sides of the T-phase transformer (4), the S-phase transformer (5) and the R-phase transformer (6) are connected to one end of an isolated phase enclosed busbar (3) via a first connector (7), and the other end of the isolated phase enclosed busbar (3) is connected to a low-voltage side power distribution device incoming cabinet (2) arranged on one side of the R-phase transformer (6) via a second connector (8).

2. The low-voltage side busbar arrangement of a single-phase transformer group according to claim 1 is characterized in that: The low-voltage side winding T1 end of the R-phase transformer (6) is connected to the low-voltage side winding T2' end of the S-phase transformer (5) through the phase-isolated closed busbar (3), and then connected to the R phase of the low-voltage side distribution device incoming cabinet (2); the low-voltage side winding T2 end of the S-phase transformer (5) is connected to the low-voltage side winding T3' end of the T-phase transformer (4) through the phase-isolated closed busbar (3), and then connected to the S phase of the low-voltage side distribution device incoming cabinet (2); the low-voltage side winding T3 end of the T-phase transformer (4) is connected to the low-voltage side winding T1' end of the R-phase transformer (6) through the phase-isolated closed busbar (3), and then connected to the T phase of the low-voltage side distribution device incoming cabinet (2); the R / S / T phases of the low-voltage side distribution device incoming cabinet (2) are respectively connected to the medium-voltage cabinet connection terminal through the upper incoming line.

3. The low-voltage side busbar arrangement of a single-phase transformer group according to claim 2 is characterized in that: The first connecting pieces on the low-voltage sides of the T-phase transformer, the S-phase transformer and the R-phase transformer and the second connecting pieces on the isolated-phase enclosed busbar are all bushings and soft wires.

4. The low-voltage side busbar arrangement of a single-phase transformer group according to claim 3 is characterized in that: The T-phase transformer (4), the S-phase transformer (5) and the R-phase transformer (6) are high-voltage, medium-voltage or low-voltage single-phase autotransformers.

5. The low-voltage side busbar arrangement of a single-phase transformer group according to claim 2 is characterized in that: The low-voltage side power distribution device incoming line cabinet (2) is an 11Kv power distribution device incoming line cabinet.

6. The low-voltage side busbar arrangement of a single-phase transformer group according to claim 2 is characterized in that: The isolated phase enclosed busbar (3) is installed and arranged by means of steel structure support.

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