CVT capable of externally realizing ratio difference fine tuning function

Abstract

The utility model relates to a CVT capable of externally realizing a ratio difference fine tuning function, and relates to the technical field of power equipment design and manufacturing. The device comprises a capacitive voltage divider and an electromagnetic unit, the capacitive voltage divider is located above the electromagnetic unit; the electromagnetic unit comprises a terminal box, a secondary terminal board and an adjusting winding; the secondary terminal board and the adjusting winding are positioned in the terminal box; the secondary terminal board comprises a functional pile head group and a standby pile head group, and the functional pile head group and the standby pile head group respectively comprise at least one wiring pile head. Under the scene that the requirement for debugging the CVT is met, fine adjustment of the specific value difference of the CVT is achieved through the wiring pile head reserved in the terminal board and by adjusting the wiring mode in the secondary terminal board, the CVT can be debugged on site without employing a crane for disassembly, and the convenient debugging function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of design and manufacturing of electric power equipment, in particular to a capacitor voltage transformer (CVT) with an external ratio difference fine-tuning function. Background Art

[0002] CVT is a secondary terminal board of CVT (capacitive voltage transformer) and is an important component of CVT equipment. It is usually used to connect the secondary circuit, that is, to connect the measuring and protection equipment. The function of the secondary terminal board is to lead the secondary low-voltage terminal inside the CVT to the external equipment, so as to realize the measurement and monitoring of the voltage. In the related technology, the error adjustment (including ratio difference and phase angle difference) of CVT is carried out in the factory. During the test, the capacitive voltage divider and the electromagnetic unit are in a separated state (the two are fixed by a temporary bracket, and only the electrical connection is tested with a wire, and the final mechanical tightening state is not completed). By adjusting the ratio difference adjustment winding of the intermediate transformer immersed in the transformer oil inside the electromagnetic unit and the phase angle difference adjustment winding of the compensating reactor, the error of the whole CVT meets the technical requirements.

[0003] In the related art, the error test is completed in the factory and the capacitor voltage divider and the electromagnetic unit are assembled into a whole before delivery to the customer. If the product fails the error test during the customer's on-site retest (mostly the ratio difference slightly exceeds the requirement), the capacitor voltage divider needs to be lifted off the electromagnetic unit by a crane, and readjusted and tested again based on the on-site retest data to meet the technical requirements.

[0004] However, the debugging method in the related art requires the use of large tools, which is time-consuming and labor-intensive. Summary of the invention

[0005] The utility model relates to a CVT with an external ratio difference fine-tuning function, which can improve the fixed secondary terminal board in the prior art to achieve a convenient debugging function. The device includes a capacitive voltage divider and an electromagnetic unit;

[0006] The capacitive voltage divider is located above the electromagnetic unit;

[0007] The electromagnetic unit includes a terminal box, a secondary terminal board and a regulating winding;

[0008] The secondary terminal board and regulating winding are located inside the terminal box;

[0009] The secondary terminal board includes a functional pile head group and a spare pile head group, and each of the functional pile head group and the spare pile head group includes at least one wiring pile head;

[0010] At least one connection terminal in the functional terminal group is used to connect to the regulating winding when the CVT is in an installed state;

[0011] At least one connection terminal of the spare terminal group is used to be idle when the CVT is in an installation state, and is connected to the regulating winding when the CVT is in an adjustment state.

[0012] In a possible implementation, the standby pile head group includes 6 wiring pile heads, and the functional pile head group includes 13 wiring pile heads.

[0013] In a possible implementation, when the CVT is in an installed state, the regulating winding corresponds to a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, and a sixth terminal;

[0014] The secondary terminal board has a seventh terminal, an eighth terminal, a ninth terminal, a tenth terminal and an eleventh terminal;

[0015] When the CVT is in the installed state, the secondary terminal board is located at the junction of the air side and the oil, and the regulating winding is located in the oil.

[0016] In a possible implementation, the regulating winding is connected to the secondary terminal board via the fifth terminal;

[0017] The secondary terminal board is connected to the regulating winding through the eleventh terminal.

[0018] In a possible implementation, the first terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal and the sixth terminal are connected in sequence in the oil;

[0019] The seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal and the eleventh terminal are connected in sequence on the air side.

[0020] The beneficial effects brought by the technical solution provided by the utility model include at least:

[0021] In the scenario where there is a need to debug the CVT, the CVT ratio difference can be fine-tuned by adjusting the wiring method in the secondary terminal board through the reserved wiring terminals in the terminal board, so that the CVT can be debugged without returning to the factory, realizing a convenient debugging function. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the external structure of a CVT for externally implementing a ratio difference fine-tuning function provided by an exemplary embodiment of the present application is shown.

[0024] Figure 2 A structural schematic diagram of a regulating winding provided by an exemplary embodiment of the present application is shown.

[0025] Figure 3 A schematic structural diagram of a secondary terminal box provided by an exemplary embodiment of the present application is shown.

[0026] Figure 4 A schematic diagram of a line connection relationship provided by an exemplary embodiment of the present application is shown.

[0027] Figure 5 Another schematic diagram of line connection relationship provided by an exemplary embodiment of the present application is shown.

[0028] The reference numerals in the accompanying drawings are as follows:

[0029] 1-capacitive voltage divider, 2-electromagnetic unit;

[0030] 21-terminal box, 22-secondary terminal board, 23-regulating winding;

[0031] 231 - first terminal, 232 - second terminal, 233 - third terminal, 234 - fourth terminal, 235 - fifth terminal, 236 - sixth terminal;

[0032] 221 - the seventh terminal, 222 - the eighth terminal, 223 - the ninth terminal, 224 - the tenth terminal, 225 - the eleventh terminal. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Figure 1 FIG. 1 shows a schematic diagram of the external structure of a CVT for externally implementing a ratio difference fine-tuning function provided by an exemplary embodiment of the present application. Figure 2 A schematic structural diagram of a regulating winding 23 provided by an exemplary embodiment of the present application is shown. Figure 3 FIG. 2 shows a schematic diagram of the structure of a secondary terminal box 21 provided by an exemplary embodiment of the present application. Figures 1 to 3The CVT with external ratio difference fine-tuning function shown in the present application includes a capacitive voltage divider 1 and an electromagnetic unit 2; the capacitive voltage divider 1 is located above the electromagnetic unit 2; the electromagnetic unit 2 includes a terminal box 21, a secondary terminal board 22 and a regulating winding. Among them, the secondary terminal board 22 and the regulating winding are located inside the terminal box 21.

[0035] The secondary terminal board 22 includes a functional terminal head group and a spare terminal head group, each of which includes at least one wiring terminal head. At least one wiring terminal head in the functional terminal head group is used to connect to the regulating winding when the CVT is in the installation state. At least one wiring terminal head in the spare terminal head group is used to be idle when the CVT is in the installation state, and is connected to the regulating winding when the CVT is in the adjustment state.

[0036] In the embodiment of the present application, the spare pile head group includes 6 wiring pile heads, and the functional pile head group includes 13 wiring pile heads. That is, unlike the 13 wiring pile heads in the secondary terminal board 22 in the related art, and all the pile heads are in working state, in the embodiment of the present application, there will be at least one idle wiring pile head.

[0037] Next, the internal circuits involved in the embodiments of the present application are Figure 4 and Figure 5 For display. Corresponding to its internal circuit conditions, the terminal corresponding to the regulating winding 23 is located on the oil side, while the terminal corresponding to the secondary terminal board 22 is located on the air side. When the CVT is in the installation state, the regulating winding corresponds to the first terminal 231, the second terminal 232, the third terminal 233, the fourth terminal 234, the fifth terminal 235 and the sixth terminal 236; the secondary terminal board 22 has the seventh terminal 221, the eighth terminal 222, the ninth terminal 223 and the tenth terminal 224, the eleventh terminal 225; when the CVT is in the installation state, the secondary terminal board 22 is located at the junction of the air side and the oil, and the regulating winding 23 is located in the oil.

[0038] In this case, in a wiring method shown in this application, in a possible implementation method, please refer to Figure 4 as well as Figure 5 , the regulating winding 23 is connected to the secondary terminal board 22 through the fifth terminal 235 ; the secondary terminal board 22 is connected to the regulating winding 23 through the eleventh terminal 225 .

[0039] It should be noted that, in the case of any external connection, the first terminal 231, the second terminal 232, the third terminal 233, the fourth terminal 234, the fifth terminal 235 and the sixth terminal 236 are connected in sequence in the oil; the seventh terminal 221, the eighth terminal 222, the ninth terminal 223, the tenth terminal 224 and the eleventh terminal 225 are connected in sequence on the air side.

[0040] In one example, if Figure 4 As shown, when the CVT leaves the factory, the eleventh terminal 225 and the seventh terminal 221 are connected externally on the air side. At this time, if a slight deviation in the ratio difference is found during on-site retesting, the external connection between the eleventh terminal 225 and the seventh terminal 221 can be disconnected, and the seventh terminal 221, the eighth terminal 222, the ninth terminal 223, the tenth terminal 224 and the eleventh terminal 225 can be debugged with any external connection until the slight deviation in the ratio difference is eliminated. Figure 5 As shown, it shows a situation in which the seventh wiring terminal 221 is connected to the eighth wiring terminal 222, and the ninth wiring terminal 223 is connected to the eleventh wiring terminal 225 in an external wiring environment.

[0041] To summarize, the device provided in the embodiment of the present application, in a scenario where there is a need to debug the CVT, can achieve fine-tuning of the CVT ratio difference through the reserved wiring posts in the terminal board and by adjusting the wiring method in the secondary terminal board, so that the CVT can be debugged without returning to the factory or being disassembled by a crane, thereby realizing a convenient debugging function.

[0042] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A CVT with an external ratio difference fine-tuning function, characterized in that: The CVT for externally realizing a ratio difference fine-tuning function comprises a capacitive voltage divider (1) and an electromagnetic unit (2); The capacitive voltage divider (1) is located above the electromagnetic unit (2); The electromagnetic unit (2) comprises a terminal box (21), a secondary terminal board (22) and a regulating winding (23); The secondary terminal board (22) and the regulating winding (23) are located inside the terminal box (21); The secondary terminal board (22) comprises a functional pile head group and a spare pile head group, and each of the functional pile head group and the spare pile head group comprises at least one wiring pile head; At least one connection terminal in the functional terminal group is used to connect to the regulating winding (23) when the CVT is in an installed state; At least one connection terminal of the spare terminal group is used to be idle when the CVT is in an installation state, and to be connected to the regulating winding (23) when the CVT is in an adjustment state.

2. The CVT with external ratio difference fine-tuning function according to claim 1, characterized in that: The standby pile head group includes 6 connection pile heads, and the functional pile head group includes 13 connection pile heads.

3. The CVT with external ratio difference fine-tuning function according to claim 2, characterized in that: When the CVT is in an installed state, the regulating winding (23) corresponds to a first terminal (231), a second terminal (232), a third terminal (233), a fourth terminal (234), a fifth terminal (235), and a sixth terminal (236); The secondary terminal board (22) has a seventh terminal (221), an eighth terminal (222), a ninth terminal (223), a tenth terminal (224) and an eleventh terminal (225); When the CVT is in an installed state, the secondary terminal plate (22) is located at the interface between the air side and the oil, and the regulating winding (23) is located in the oil.

4. The CVT with external ratio difference fine-tuning function according to claim 3, characterized in that: The regulating winding (23) is connected to the secondary terminal board (22) via the fifth terminal (235); The secondary terminal board (22) is connected to the regulating winding (23) via the eleventh terminal (225).

5. The CVT with external ratio difference fine-tuning function according to claim 4, characterized in that: The first terminal (231), the second terminal (232), the third terminal (233), the fourth terminal (234), the fifth terminal (235), and the sixth terminal (236) are connected in sequence in the oil; The seventh terminal (221), the eighth terminal (222), the ninth terminal (223), the tenth terminal (224), and the eleventh terminal (225) are connected in sequence on the air side.

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