Transformer cabinet with input isolation buffer
By setting up an isolation transformer device in the transformer cabinet, the contactor and buffer resistor are used to achieve isolation and buffering of the input AC power, the existing high-voltage inverter has solved the problem of large land and high cost, and the space utilization rate and low cost are achieved effect.
Patent Information
- Application Number
- CN202420236283.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-01-31
AI Technical Summary
Existing high-voltage inverters are usually composed of three cabinets, with a large area, low space utilization, and high production cost.
A transformer cabinet with input isolation buffer is designed. By setting up an isolation transformer device in the cabinet body, the contactor and buffer resistor are used to achieve isolation buffering of the input AC power, eliminating the arrangement of buffer wiring cabinets.
Reduces the number of cabinets, improves space utilization, saves costs, and realizes effective buffering of input AC power.
Smart Images
Figure CN222441541U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a transformer cabinet, and more specifically, to a transformer cabinet with input isolation buffer. Background Art
[0002] At present, for frequency converters, especially high-voltage frequency converters, they are usually composed of three cabinets, namely, buffer wiring cabinet, transformer cabinet and rectifier inverter cabinet. The buffer wiring cabinet is used to buffer the input AC power. The AC power is buffered by the buffer wiring cabinet and then input into the transformer cabinet. The AC power input into the transformer cabinet is transformed (or phase-shifted) and then input into the rectifier inverter cabinet. The AC power input into the rectifier inverter cabinet is first rectified into DC power, and then outputted into frequency-controllable AC power after being inverted by the inverter unit to drive the AC load to work in frequency conversion.
[0003] In actual use, since the inverter is composed of three cabinets, it occupies a large area and has low space utilization. It is very inconvenient to use in occasions with relatively cramped space, and the three cabinets will also increase the production cost. Summary of the invention
[0004] In order to overcome the disadvantages of the above technical problems, the utility model provides a transformer cabinet with input isolation buffer.
[0005] The utility model discloses a transformer cabinet with input isolation buffer, comprising a cabinet body and a transformer, three-phase input wiring terminals, three-phase output wiring terminals and a control module arranged in the cabinet body, a ventilation window is arranged on the panel on the front side of the cabinet body, a heat dissipation fan is arranged on the top of the cabinet body, the three-phase input wiring terminals are connected with the three-phase input power supply, the transformer is used to transform the input alternating current, the output end of the transformer is connected with the three-phase output terminal, and the heat dissipation fan dissipates heat for the heating device in the cabinet body; the utility model is characterized in that: an isolation transformer device is arranged in the cabinet body, the isolation transformer device comprises a contactor and a buffer resistor, the normally open point of the contactor is connected in series between the three-phase input wiring terminals and the input end of the transformer, and the buffer resistor is connected in series with the normally open point of the contactor.
[0006] The utility model discloses a transformer cabinet with input isolation buffer, wherein the isolation transformer device further comprises a fixed base, a wiring bracket, a copper busbar and an insulator, wherein the fixed base is fixed in the cabinet, the contactor is fixed on the fixed base, the wiring bracket is located above the fixed base, the insulator is fixed on the wiring bracket, the copper busbar is fixed on the insulator, and both ends of the buffer resistor are fixed on the copper busbar.
[0007] The utility model discloses a transformer cabinet with input isolation buffer, wherein an output voltage detection module is arranged in the cabinet, and the wiring terminals of the control module, the wiring terminals of the voltage detection module, the three-phase input wiring terminals and the three-phase output wiring terminals are all close to the front door panel of the cabinet.
[0008] The utility model discloses a transformer cabinet with input isolation buffer, wherein a first side panel and a second side panel are arranged on the side of the cabinet, and a cabinet connection hole for connecting with other cabinets is opened on the upright column on the side of the cabinet.
[0009] The utility model discloses a transformer cabinet with input isolation buffer, wherein a forklift hole is arranged at the bottom of the cabinet, and lifting rings are fixed on four corners of the upper end of the cabinet.
[0010] The beneficial effects of the utility model are as follows: the transformer cabinet with input isolation buffer of the utility model has a transformer, a control module, an isolation buffer device, input and output terminals arranged in the cabinet, a heat dissipation fan arranged on the cabinet, the heat dissipation fan dissipates heat for the heating device in the cabinet, a contactor and a buffer resistor are arranged in the isolation buffer device, and the buffer resistor is connected in parallel with the normally open point of the contactor, the external input AC power is connected to the input terminal, and is connected to the input end of the transformer through the isolation buffer device, and the output end of the transformer is connected to the three-phase output terminal, under the control of the control module, the input AC power is first input to the input end of the transformer through the buffer resistor, and after the buffering is completed, the normally open point of the contactor is closed, so that the AC power is directly input to the input end of the transformer, thus realizing the buffering of the input AC power supply, and also eliminating the need to arrange a buffer wiring cabinet, compared with the existing high-voltage frequency converter which needs to arrange three cabinets including a buffer wiring cabinet, a transformer cabinet and a rectifier inverter cabinet, the frequency converter becomes two cabinets, thereby reducing the number of cabinets, improving space utilization and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a front view of a transformer cabinet with input isolation buffer of the utility model;
[0012] Figure 2 It is a left view of the transformer cabinet with input isolation buffer of the utility model;
[0013] Figure 3 , Figure 4 All of them are three-dimensional diagrams of the transformer cabinet with input isolation buffer of the utility model;
[0014] Figure 5 It is a structural schematic diagram of the isolation buffer device in the utility model;
[0015] Figure 6 This is a circuit schematic diagram of a transformer cabinet with input isolation buffer of the utility model.
[0016] In the figure: 1 cabinet, 2 isolation buffer device, 3 transformer, 4 control module, 5 cooling fan, 6 output voltage detection module, 7 three-phase input terminal, 8 three-phase output terminal, 9 ventilation window, 10 cabinet connection hole, 11 first side panel, 12 second side panel, 13 fixed base, 14 contactor, 15 wiring bracket, 16 copper busbar, 17 insulator, 18 buffer resistor, 19 forklift hole, 20 lifting ring. DETAILED DESCRIPTION
[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0018] like Figure 1 and Figure 2 As shown, the front view and the left view of the transformer cabinet with input isolation buffer of the utility model are respectively given. Figure 3 and Figure 4 Its stereogram is given, Figure 6 The circuit schematic diagram is given. The transformer cabinet with input isolation buffer shown is composed of a cabinet 1 and an isolation buffer device 2, a transformer 3, a control module 4, a three-phase input terminal 7, a three-phase output terminal 8 and an output voltage detection module 6 arranged in the cabinet 1. The cabinet 1 plays a fixing and supporting role. The isolation buffer device 2 is arranged on the left side of the cabinet 1, and the transformer 3 is located in the middle and left part of the internal cavity of the cabinet 1. The three-phase input terminal 7 and the three-phase output terminal 8 are arranged in the middle and lower part of the left side of the cabinet 1, the control module 4 is arranged in the upper part of the left side, and the output voltage detection module 6 is arranged above the three-phase input terminal 8.
[0019] The externally input three-phase AC power is connected to the three-phase input terminal 7, the input end (primary side) of the transformer 3 is connected to the three-phase input terminal 7 via the isolation buffer device 2, and the output end (secondary side) of the transformer 3 is connected to the three-phase output terminal 8. The isolation buffer device 2 implements isolation and buffering of the input three-phase AC power, the transformer 3 implements voltage transformation of the input AC power, the control module 4 controls the operation of the transformer 3 and the cooling fan 5, and collects the current output by the transformer 3, and the output voltage detection module 6 is used to detect the voltage value output by the transformer 3.
[0020] like Figure 6As shown, a circuit schematic diagram of a transformer cabinet with input isolation buffer of the utility model is given. The isolation buffer device 2 shown includes a contactor 14 and a buffer resistor 18. The normally open point of the contactor 14 is connected in series to the input end of the transformer 3, and the buffer resistor 18 is connected in parallel to the normally open point of the contactor 14. In this way, when the transformer 3 is powered on, the normally open point state of the contactor 14 is kept unchanged first, and the input three-phase AC power supplies power to the transformer 3 through the buffer resistor 18, and the buffer resistor 18 is used for isolation buffering; after the buffering is completed, the normally open point of the contactor 14 is closed, so that the input three-phase AC power directly supplies power to the transformer 4.
[0021] It can be seen that since the isolation buffer device 2 arranged in the cabinet 1 realizes the power-on isolation buffer of the transformer 3, the arrangement of the buffer wiring cabinet is eliminated. Compared with the existing high-voltage inverter which needs to arrange three cabinets including the buffer wiring cabinet, the transformer cabinet and the rectifier inverter cabinet, the number of cabinets is reduced, the space utilization rate is improved, and the cost is saved.
[0022] like Figure 5 As shown, a schematic diagram of the structure of the isolation buffer device in the utility model is given, and the isolation buffer device 2 shown also includes a fixed base 13, a wiring bracket 15, a copper busbar 16 and an insulator 17. The fixed base 13 is fixed in the cabinet 1, the contactor 14 is fixed on the fixed base 13, and the wiring bracket 15 is located above the contactor 14. Insulators 17 are provided at both ends of the buffer resistor 18, and a copper busbar 16 is fixed on the insulator 17. Both ends of the buffer resistor 18 are fixed on the copper busbar 16, and the buffer resistor 18 is connected in parallel with the normally open point of the contactor 14.
[0023] A ventilation window 9 is provided on the panel on the front side of the cabinet 1, and a heat dissipation fan 5 is provided above the cabinet 1. Under the suction action of the heat dissipation fan 5, the outside air enters the cabinet 1 through the ventilation window 9, and takes away the heat generated during the operation of the transformer 3, so as to achieve heat dissipation of the transformer 3 and other heating devices.
[0024] The cabinet 1 shown can be a sheet metal reinforced cabinet, which is made by sheet metal bending and welding technology. The cabinet 1 has a lifting ring 20 on the top and a forklift hole 19 on the bottom to facilitate transportation and installation. All live terminals and signal lines of the transformer 3 are in the front, which is convenient for inspection and maintenance.
[0025] The wiring terminals of the control module 4, the wiring terminals of the output voltage detection module 6, the three-phase input wiring terminals 7 and the three-phase output wiring terminals 8 are also located behind the front door of the cabinet 1. The interior of the cabinet can be inspected and maintained by opening the cover of the module. The three-phase input wiring terminals 7 and the three-phase output wiring terminals 8 are close to the cabinet door, making it convenient for personnel to reach out and connect the wires. In addition, the live display is designed on the cabinet door, and the live insulator is integrated into the transformer.
[0026] The cabinet 1 is small in depth and compact in overall structure. When installed on site, it can be completely close to the wall, and all components are maintained on the front of the cabinet. A cabinet-joining hole 10 is reserved on the column on the side of the cabinet 1. When the inverter needs to add the power frequency function, it is only necessary to remove the first side panel 11 and the second side panel 12 and join the switch cabinet with them. The removed side panel can be installed in the switch cabinet.
[0027] It can be seen that the transformer cabinet with input isolation buffer of the utility model has the advantages of high space utilization, low cost, single-sided maintenance, and reasonable and convenient wiring process in the cabinet.
Claims
1. A transformer cabinet with input isolation buffer, comprising a cabinet (1) and a transformer (3) arranged in the cabinet, a three-phase input terminal (7), a three-phase output terminal (8) and a control module (4), a ventilation window (9) being arranged on a panel on the front side of the cabinet, a heat dissipation fan (5) being arranged above the cabinet, the three-phase input terminal being connected to a three-phase input power source, the transformer being used to transform the input alternating current, the output end of the transformer being connected to the three-phase output terminal, and the heat dissipation fan dissipating heat from a heating device in the cabinet; characterized in that: An isolation transformer device (2) is arranged in the cabinet, the isolation transformer device comprising a contactor (14) and a buffer resistor (18), the normally open point of the contactor being connected in series between the three-phase input wiring terminal and the transformer input end, and the buffer resistor being connected in series with the normally open point of the contactor.
2. The transformer cabinet with input isolation buffer according to claim 1 is characterized in that: The isolating transformer device (2) further comprises a fixed base (13), a wiring bracket (15), a copper busbar (16) and an insulator (17); the fixed base is fixed in the cabinet (1); the contactor is fixed on the fixed base; the wiring bracket is located above the fixed base; the insulator is fixed on the wiring bracket; the copper busbar is fixed on the insulator; and both ends of the buffer resistor (18) are fixed on the copper busbar.
3. The transformer cabinet with input isolation buffer according to claim 1 or 2, characterized in that: An output voltage detection module (6) is arranged in the cabinet (1), and the wiring terminals of the control module (4), the wiring terminals of the voltage detection module, the three-phase input wiring terminals (7) and the three-phase output wiring terminals (8) are all close to the front door panel of the cabinet.
4. The transformer cabinet with input isolation buffer according to claim 1 or 2, characterized in that: The cabinet body (1) is provided with a first side panel (11) and a second side panel (12) on the side surface, and a cabinet-joining hole (10) for connecting with other cabinet bodies is provided on the upright column on the side surface of the cabinet body.
5. The transformer cabinet with input isolation buffer according to claim 1 or 2, characterized in that: The bottom of the cabinet (1) is provided with a forklift hole (19), and four corners of the upper end of the cabinet are fixed with lifting rings (20).