A high-voltage sampling resistor component and device

Abstract

The present invention discloses a high-voltage sampling resistor assembly and device. One end of the high-voltage sampling resistor assembly in the device is connected to a first insulating bracket; the other end of the high-voltage sampling resistor assembly is connected to a second insulating bracket. The first-side insulating bracket is connected to one end of the first insulating bracket and one end of the second insulating bracket, and the second-side insulating bracket is connected to the other end of the first insulating bracket and the other end of the second insulating bracket. A grounding copper bar is arranged on the first insulating bracket, a voltage-dividing sampling board is arranged on the grounding copper bar, a TVS tube is arranged on the voltage-dividing sampling board, and a plurality of grounding nuts are respectively arranged on the grounding copper bar and the voltage-dividing sampling board. By designing the high-voltage sampling resistor assembly, the present invention solves the problems of single voltage detection level, large volume, high cost, and short service life of the voltage sampler. At the same time, due to the high integration and high safety of the device, the practicability and reliability of the device for sampling high voltage are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and particularly relates to a high-voltage sampling resistor assembly and device. Background Art

[0002] In daily life, the use of three-phase voltage is very common. The alternating current produced, transmitted, and distributed by power plants and power grids in our country is three-phase voltage. Therefore, it is quite urgent to design a sampling method for three-phase voltage for the detection of three-phase voltage, the monitoring of transmission faults, and the analysis of three-phase voltage. Traditional high-voltage detection devices mainly use voltage transformers for voltage sampling. For different voltage levels, different specifications of voltage transformers are required. At the same time, voltage transformers have high cost, large volume, low integration, and the traditional sampling device has a single grounding point and low safety performance. Summary of the Invention

[0003] The present invention provides a high-voltage sampling resistor assembly to solve the problems of single voltage detection level, large volume, high cost, and short service life of traditional voltage samplers.

[0004] The present invention is realized through the following technical solutions:

[0005] A high-voltage sampling resistor assembly includes a first voltage-dividing sampling resistor, a second voltage-dividing sampling resistor, a ceramic tube, a first connecting wire, a second connecting wire, a third connecting wire, a first positioning plug, a positioning device, a third positioning plug, and a wire;

[0006] One end of the first voltage-dividing sampling resistor, the second connecting wire, and one end of the second voltage-dividing sampling resistor are connected in sequence and arranged inside the ceramic tube;

[0007] The first positioning plug is arranged at the other end of the first voltage-dividing sampling resistor and is connected to the other end of the first voltage-dividing sampling resistor for fixing the other end of the first voltage-dividing sampling resistor;

[0008] The positioning device is arranged between the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor and is connected to both the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor for fixing one end of the first voltage-dividing sampling resistor and one end of the second voltage-dividing sampling resistor;

[0009] The third positioning plug is arranged at the other end of the second voltage-dividing sampling resistor and is connected to the other end of the second voltage-dividing sampling resistor for fixing the other end of the second voltage-dividing sampling resistor;

[0010] The first connecting wire passes through the first positioning plug, one end is connected to the other end of the first voltage-dividing sampling resistor, and the other end extends out of the first positioning plug;

[0011] The third connecting wire passes through the third positioning plug, with one end connected to the other end of the second voltage-dividing sampling resistor and the other end extending out of the third positioning plug;

[0012] One end of the wire is connected to the second connecting wire, and the other end of the wire passes through and extends out of the third positioning plug or the first positioning plug;

[0013] In this technical solution, the first connecting wire, the first voltage-dividing sampling resistor, the second connecting wire, the second voltage-dividing sampling resistor, and the third connecting wire are connected in sequence. The first voltage-dividing sampling resistor, the second connecting wire, and the second voltage-dividing sampling resistor are arranged inside the ceramic tube; the first positioning plug is arranged at the connection end of the first connecting wire and the first voltage-dividing sampling resistor, and is used to fix the other end of the first voltage-dividing sampling resistor at one end of the ceramic tube; the first connecting wire passes through the first positioning plug and extends out of the first positioning plug; the positioning device is arranged between the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor and is respectively in contact with one end of the first voltage-dividing sampling resistor and one end of the second voltage-dividing sampling resistor. The second connecting wire passes through the positioning device, so that one end of the first voltage-dividing sampling resistor and one end of the second voltage-dividing sampling resistor can be fixed by the positioning device; the third positioning plug is arranged at the connection end of the third connecting wire and the second voltage-dividing sampling resistor, and is used to fix the other end of the second voltage-dividing sampling resistor at the other end of the ceramic tube; the third connecting wire passes through the third positioning plug and extends out of the third positioning plug; one end of the wire is connected to the second connecting wire, and the other end of the wire passes through and extends out of the third positioning plug through the round hole provided on the third positioning plug; due to the above structure, the volume of the sampling resistor assembly is relatively small. Compared with the prior art, the use space is greatly saved. At the same time, the voltage-dividing resistor can be used to complete the voltage detection of different voltage levels and different power segments. And because the two-stage voltage-dividing sampling resistor is adopted, when the voltage signal enters the high-voltage sampling resistor assembly through the first connecting wire or the third connecting wire, a low-voltage signal will be generated on the second connecting wire between one end of the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor. Then, the low-voltage signal is collected through the wire, and the high voltage is collected in cooperation with the high-voltage side voltage; this technical solution replaces the traditional voltage sampling of the voltage transformer and saves the cost; furthermore, because the high-voltage sampling resistor assembly adopts a ceramic tube, the working temperature of the resistor is reduced and the service life is prolonged.

[0014] Further, the high-voltage sampling resistor assembly further includes a wire fixing device, and the wire fixing device is arranged at the gap between the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor;

[0015] In this technical solution, since a positioning device is further provided between the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor, the wire fixing device can cooperate with the positioning device to fix one end of the first voltage-dividing sampling resistor, one end of the second voltage-dividing sampling resistor, and the second connecting wire. At the same time, the wire led out from the second connecting wire is fixed, making the internal wiring of the high-voltage sampling resistor assembly simpler.

[0016] Furthermore, the high-voltage sampling resistor assembly further includes a plurality of silicone rubber seals; the plurality of silicone rubber seals are respectively arranged between the first positioning plug, the positioning device, the third positioning plug, the wire fixing device and the inner wall of the ceramic tube;

[0017] In this technical solution, by using a plurality of silicone rubber seals and arranging them between the first positioning plug, the positioning device, the third positioning plug, the wire fixing device and the inner wall of the ceramic tube, the gaps between the first positioning plug, the positioning device, the third positioning plug, the wire fixing device and the inner wall of the ceramic tube can be effectively filled, further fixing the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor. At the same time, the silicone rubber seal has high heat resistance, which can effectively prevent the sealing looseness caused by the heat generated by the voltage-dividing resistor. Moreover, the silicone rubber seal has good corona resistance and arc resistance, making the high-voltage sampling resistor assembly more stable during operation.

[0018] Furthermore, the resistance value of the first voltage-dividing sampling resistor is 5 to 100 times that of the second voltage-dividing sampling resistor;

[0019] In this technical solution, the ratio of the resistance value of the first voltage-dividing sampling resistor to that of the second voltage-dividing sampling resistor will be determined according to the specific parameters of the control system for collecting the low-voltage signal and the high-voltage side voltage signal generated on the second connecting wire.

[0020] This application further provides a high-voltage sampling resistor device, including a high-voltage sampling resistor assembly, a first insulating bracket, and a second insulating bracket;

[0021] The number of the high-voltage sampling resistor assemblies is 3;

[0022] One end of each high-voltage sampling resistor assembly is connected to the first insulating bracket; the other end of each high-voltage sampling resistor assembly is connected to the second insulating bracket;

[0023] The high-voltage sampling resistor assembly is any one of the high-voltage sampling resistor assemblies in the above technical solution;

[0024] The first connecting wire or the third connecting wire on one end of the high-voltage sampling resistor assembly all pass through the first insulating bracket;

[0025] In this technical solution, a high-voltage sampling resistor device is used to sample three-phase voltages. Therefore, the device includes 3 high-voltage sampling resistor components, and each high-voltage sampling resistor component is used to sample one-phase voltage. The first connecting wire or the third connecting wire at one end of the high-voltage sampling resistor component passes through the first insulating bracket to input the three-phase voltages into the high-voltage sampling resistor component. In order to better sample the three-phase voltages, an insulating bracket is used to prevent electric leakage.

[0026] Furthermore, the high-voltage sampling resistor device further includes a first-side insulating bracket and a second-side insulating bracket.

[0027] One end of the first-side insulating bracket is connected to one end of the first insulating bracket, and the other end of the first-side insulating bracket is connected to one end of the second insulating bracket.

[0028] One end of the second-side insulating bracket is connected to the other end of the first insulating bracket, and the other end of the second-side insulating bracket is connected to the other end of the second insulating bracket.

[0029] In this technical solution, two side insulating brackets are respectively connected to the first insulating bracket and the second insulating bracket, and finally a square structure is formed by the four insulating brackets to complete the fixation and support of the 3 high-voltage sampling resistor components, so that the 3 high-voltage sampling resistor components are fixed within the square insulating bracket structure. At the same time, the 3 high-voltage sampling resistor components for three-phase sampling are installed on a frame, improving the integration of the device.

[0030] Furthermore, the high-voltage sampling resistor device further includes a grounding copper bar, a voltage-dividing sampling board, and a TVS tube.

[0031] The grounding copper bar is arranged on the first insulating bracket.

[0032] The voltage-dividing sampling board is arranged on the grounding copper bar.

[0033] The TVS tube is arranged on the voltage-dividing sampling board.

[0034] In this technical solution, the grounding copper bar is used to conduct the voltage output from the high-voltage sampling resistor component to the voltage-dividing sampling board. At the same time, it is convenient to set multiple voltage-dividing sampling boards. The voltage-dividing sampling board is used to collect high-voltage side voltage signals. The TVS tube is arranged on the voltage-dividing sampling board to prevent instantaneous high voltage from damaging the circuit, thereby ensuring the safety of the device.

[0035] Furthermore, the high-voltage sampling resistor device further includes a plurality of grounding nuts, and the plurality of grounding nuts are respectively arranged on the grounding copper bar and the voltage-dividing sampling board.

[0036] In this technical solution, by using a plurality of grounding nuts, multi-point grounding of the sampling device is completed. Even if there is partial loose connection in the device, the safety of the device can still be ensured.

[0037] In summary, the beneficial effects of the present invention are as follows. By adopting the above sampling resistor component structure, voltage detection for different voltage levels and different power segments can be achieved. At the same time, the use of traditional voltage transformers is replaced, saving the usage cost. And due to the adoption of resistor sampling, the usage space is saved. Finally, by using a ceramic tube, the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0039] 1 - First voltage - dividing sampling resistor, 2 - Second voltage - dividing sampling resistor, 3 - Ceramic tube, 4 - First connecting wire, 5 - Second connecting wire, 6 - Third connecting wire, 7 - First positioning plug, 8 - Positioning device, 9 - Third positioning plug, 10 - Wire, 11 - Wire fixing device, 12 - Silicone rubber sealing ring, 13 - High - voltage sampling resistor component, 14 - First insulating bracket, 15 - Second insulating bracket, 16 - First side insulating bracket, 17 - Second side insulating bracket, 18 - Grounding copper bar, 19 - Voltage - dividing sampling board, 20 - TVS tube, 21 - Grounding nut.

[0040] Figure 1 is a sectional structure diagram of the sampling resistor component of the present invention;

[0041] Figure 2 is a perspective view of the sampling resistor component of the present invention;

[0042] Figure 3 is a front - view structure diagram of the high - voltage sampling resistor device of the present invention;

[0043] Figure 4 is a left - side view structure diagram of the high - voltage sampling resistor device of the present invention;

[0044] Figure 5 is a three - dimensional structure diagram of the high - voltage sampling resistor device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with embodiments and drawings. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and do not limit the present invention.

[0046] Embodiment 1:

[0047] As Figures 1 to 2As shown in the figure, a high-voltage sampling resistor assembly includes a first voltage-dividing sampling resistor 1, a second voltage-dividing sampling resistor 2, a ceramic tube 3, a first connecting wire 4, a second connecting wire 5, a third connecting wire 6, a first positioning plug 7, a positioning device 8, a third positioning plug 9, and a wire 10;

[0048] One end of the first voltage-dividing sampling resistor 1, the second connecting wire 5, and one end of the second voltage-dividing sampling resistor 2 are connected in sequence and arranged inside the ceramic tube 3;

[0049] The first positioning plug 7 is arranged at the other end of the first voltage-dividing sampling resistor 1;

[0050] The positioning device 8 is arranged between the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2;

[0051] The third positioning plug 9 is arranged at the other end of the second voltage-dividing sampling resistor 2;

[0052] The first connecting wire 4 passes through the first positioning plug 7, one end is connected to the other end of the first voltage-dividing sampling resistor 1, and the other end extends out of the first positioning plug 7;

[0053] The third connecting wire 6 passes through the third positioning plug 9, one end is connected to the other end of the second voltage-dividing sampling resistor 2, and the other end extends out of the third positioning plug 9;

[0054] One end of the wire 10 is connected to the second connecting wire 5, and the other end of the wire 10 passes through and extends out of the third positioning plug 9;

[0055] One end of the wire 10 is connected to the second connecting wire 5, and the other end of the wire 10 passes through and extends out of the third positioning plug 9;

[0056] The high-voltage sampling resistor assembly further includes a wire fixing device 11, and the wire fixing device 11 is arranged at the gap between the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2;

[0057] Further, the resistance value of the first voltage-dividing sampling resistor 1 is 5 to 100 times that of the second voltage-dividing sampling resistor 2;

[0058] The high-voltage sampling resistor assembly further includes a plurality of silicone rubber sealing rings; the plurality of silicone rubber sealing rings are respectively arranged between the first positioning plug 7, the positioning device 8, the third positioning plug 9, the wire fixing device 11 and the inner wall of the ceramic tube 3;

[0059] The first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2 are both cylinders. The two ends of the second connecting wire 5 are respectively connected to one bottom surface of the first voltage-dividing sampling resistor 1 and one bottom surface of the second voltage-dividing sampling resistor 2. The first voltage-dividing sampling resistor 1, the second connecting wire 5 and the second voltage-dividing sampling resistor 2 are arranged in the ceramic tube 3, and there are gaps between them and the inner wall of the ceramic tube 3 for arranging the first positioning plug 7, the positioning device 8, the third positioning plug 9 and the wire 10. The first positioning plug 7 is arranged at the connection end of the first connecting wire 4 and the first voltage-dividing sampling resistor 1, and is used to fix the other end of the first voltage-dividing sampling resistor 1 at one end of the ceramic tube 3. The first connecting wire 4 passes through the first positioning plug 7 and extends out of the first positioning plug 7. One end of the first positioning plug 7 is embedded in the gap between the other end of the first voltage-dividing sampling resistor 1 and the inner wall of the ceramic tube 3. At the same time, the other end of the first positioning plug 7 is cylindrical and higher than one bottom surface of the ceramic tube 3. Therefore, the first positioning plug 7 is tightly connected to the other end of the first voltage-dividing sampling resistor 1, the first connecting wire 4 and one bottom surface of the ceramic tube 3, so as to fix the first voltage-dividing sampling resistor 1 and the first connecting wire 4 in the ceramic tube 3. The positioning device 8 is arranged between the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2 and is in contact with one end of the first voltage-dividing sampling resistor 1 and one end of the second voltage-dividing sampling resistor 2 respectively. The second connecting wire 5 passes through the positioning device 8, so that one end of the first voltage-dividing sampling resistor 1 and one end of the second voltage-dividing sampling resistor 2 can be fixed by the positioning device 8. In this embodiment, the positioning device 8 adopts a positioning plug: the second positioning plug. The second positioning plug is arranged between the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2 and is connected to both the first voltage-dividing sampling resistor and the second voltage-dividing sampling resistor, and is used to fix one end of the first voltage-dividing sampling resistor 1 and one end of the second voltage-dividing sampling resistor 2. Preferably, the end of the second positioning plug connected to the second voltage-dividing sampling resistor is cylindrical, and the end of the second positioning plug connected to the first voltage-dividing sampling resistor is semi-cylindrical, and the cross-sectional centers of the semi-cylindrical structure and the cylindrical structure coincide. There is a relatively large gap position above the center of the end of the second positioning plug connected to the first voltage-dividing sampling resistor for arranging the wire fixing device 11. The wire fixing device 11 is arranged on the inner wall of the ceramic tube 3. In this way, by arranging the positioning device 8, one end of the first voltage-dividing sampling resistor 1, the second connecting wire 5 and one end of the second voltage-dividing sampling resistor 2 can be better fixed in the ceramic tube 3. The third positioning plug 9 is arranged at the connection end of the third connecting wire 6 and the second voltage-dividing sampling resistor 2, and is used to fix the other end of the second voltage-dividing sampling resistor 2 at the other end of the ceramic tube 3. The third connecting wire 6 passes through the third positioning plug 9 and extends out of the third positioning plug 9. One end of the wire 10 is connected to the second connecting wire 5, and the other end of the wire 10 passes through and extends out of the third positioning plug 9 through the round hole provided on the third positioning plug 9.One end of the third positioning plug 9 is embedded in the gap between the other end of the second voltage-dividing sampling resistor 2, the inner wall of the ceramic tube 3, and between the third connecting wire 6 and the inner wall of the ceramic tube 3. At the same time, the other end of the third positioning plug 9 is cylindrical and higher than the other bottom surface of the ceramic tube 3. Therefore, the third positioning plug 9 is tightly connected to the other end of the second voltage-dividing sampling resistor 2, the third connecting wire 6, and one bottom surface of the ceramic tube 3, so as to fix the second voltage-dividing sampling resistor 2 and the third connecting wire 6 inside the ceramic tube 3. Furthermore, the wire 10 passes through the gap between the wire fixing device 11 and the positioning device 8 and passes through the third positioning plug 9 to complete the extraction of the low level between the two-stage resistors, making the internal wiring of the high-voltage sampling resistor assembly simpler; by using multiple silicone rubber seals and setting them between the first positioning plug 7, the positioning device 8, the third positioning plug 9, the wire fixing device 11 and the inner wall of the ceramic tube 3, the gaps between the first positioning plug 7, the positioning device 8, the third positioning plug 9, the wire fixing device 11 and the inner wall of the ceramic tube 3 can be effectively filled to complete the further fixation of the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2. At the same time, the silicone rubber seal has high heat resistance and can effectively prevent the sealing looseness caused by the heat generated by the voltage-dividing resistor. Moreover, the silicone rubber seal has good corona resistance and arc resistance, making the high-voltage sampling resistor assembly more stable during operation; the resistance value ratio of the first voltage-dividing sampling resistor 1 to the second voltage-dividing sampling resistor 2 will be determined according to the specific parameters of the control system for collecting the low-voltage signal and the high-voltage side voltage signal generated on the second connecting wire 5; due to the above structure, the volume of the sampling resistor assembly is small. Compared with the prior art, the use space is greatly saved. At the same time, the voltage-dividing resistor can be used to complete the voltage detection of different voltage levels and different power segments. Moreover, due to the use of the two-stage voltage-dividing sampling resistor, when the voltage signal enters the high-voltage sampling resistor assembly through the first connecting wire 4 or the third connecting wire 6, a low-voltage signal will be generated on the second connecting wire 5 between one end of the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2, and then the low-voltage signal is collected through the wire 10 and combined with the high-voltage side voltage to complete the collection of the high voltage; this technical solution replaces the traditional voltage sampling of the voltage transformer and saves the cost; furthermore, since the high-voltage sampling resistor assembly uses the ceramic tube 3, the working temperature of the resistor is reduced and the service life is extended.

[0060] In other embodiments, the positioning device 8 can also preferably use two second positioning plugs. The two second positioning plugs are both arranged between the first voltage-dividing sampling resistor 1 and the second voltage-dividing sampling resistor 2. One second positioning plug is connected to the first voltage-dividing sampling resistor 1 and is used to fix one end of the first voltage-dividing sampling resistor 1; the other second positioning plug is connected to the second voltage-dividing sampling resistor 2 and is used to fix one end of the second voltage-dividing sampling resistor 2.

[0061] Embodiment 2

[0062] As Figures 3 to 5 shown, in this embodiment, a high-voltage sampling resistor device is provided, which includes a high-voltage sampling resistor assembly 13, a first insulating bracket 14, and a second insulating bracket 15;

[0063] The number of the high-voltage sampling resistor assemblies 13 is 3;

[0064] One end of each of the high-voltage sampling resistor assemblies 13 is connected to the first insulating bracket 14; the other end of each of the high-voltage sampling resistor assemblies 13 is connected to the second insulating bracket 15;

[0065] The high-voltage sampling resistor assembly is any one of the high-voltage sampling resistor assemblies in the above technical solution;

[0066] The first connecting wire 4 or the third connecting wire 6 on one end of the high-voltage sampling resistor assembly 13 passes through the first insulating bracket 14;

[0067] The high-voltage sampling resistor device further includes a first side insulating bracket 16 and a second side insulating bracket 17;

[0068] One end of the first side insulating bracket 16 is connected to one end of the first insulating bracket 14, and the other end of the first side insulating bracket 16 is connected to one end of the second insulating bracket 15;

[0069] One end of the second side insulating bracket 17 is connected to the other end of the first insulating bracket 14, and the other end of the second side insulating bracket 17 is connected to the other end of the second insulating bracket 15;

[0070] The high-voltage sampling resistor device further includes a grounding copper bar 18, a voltage-dividing sampling board 19, and a TVS tube 20;

[0071] The grounding copper bar 18 is arranged on the first insulating bracket 14;

[0072] The voltage-dividing sampling board 19 is arranged on the grounding copper bar 18;

[0073] The TVS tube 20 is arranged on the voltage-dividing sampling board 19;

[0074] The high-voltage sampling resistor assembly is a high-voltage sampling resistor assembly in Embodiment 1, and its structure will not be elaborated here.

[0075] In this technical solution, the first insulating bracket 14 and the second insulating bracket 15 are both double-layer insulating brackets with creepage grooves; since this device is used for sampling three-phase voltages, this device includes 3 high-voltage sampling resistor assemblies 13, and each high-voltage sampling resistor assembly 13 is used for sampling one-phase voltage; the first connecting wire 4 or the third connecting wire 6 at one end of the high-voltage sampling resistor assembly 13 all passes through the first insulating bracket 14, so as to input the three-phase voltages into the high-voltage sampling resistor assembly. At the same time, because the insulating bracket has creepage grooves, the wall of the ceramic tube 3 at one end of the high-voltage sampling resistor assembly 13 will be fixed inside the first insulating bracket 14, and the wall of the ceramic tube 3 at the other end of the high-voltage sampling resistor assembly 13 will be fixed inside the second insulating bracket 15. In this way, the positions of the 3 high-voltage sampling resistor assemblies 13 can be better fixed by the first insulating bracket 14 and the second insulating bracket 15. Then, by using two side insulating brackets to be respectively connected to the first insulating bracket 14 and the second insulating bracket 15, and finally, a square structure is formed by four insulating brackets to complete the fixation and support of the 3 high-voltage sampling resistor assemblies 13, so that the 3 high-voltage sampling resistor assemblies 13 are fixed inside the square insulating bracket structure; at the same time, the 3 high-voltage sampling resistor assemblies 13 for three-phase sampling are installed on a frame, greatly improving the integration degree of the device; in this technical solution, because insulating brackets are adopted, the occurrence of electric leakage can be effectively prevented; the grounding copper bar 18 is used to conduct the voltage output from the high-voltage sampling resistor assembly to the voltage-dividing sampling board 19, and at the same time, it is convenient to set multiple voltage-dividing sampling boards 19; the voltage-dividing sampling board 19 is used to collect high-voltage side voltage signals; the TVS tube 20 is arranged on the voltage-dividing sampling board 19 to prevent the instantaneous high voltage from damaging the circuit, thereby ensuring the safety of the device; this device completes the multi-point grounding of the sampling device by using multiple grounding nuts 21. Even if there is partial loose connection in the device, the safety of the device can be ensured; finally, according to the wire 10 in Embodiment 1, the three-phase low-voltage signals and the high-voltage side voltage signals collected by the voltage-dividing sampling board 19 are input into the main control system to complete the collection of the three-phase voltages.

[0076] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A high-voltage sampling resistor assembly, characterized in that, it includes a first voltage-dividing sampling resistor (1), a second voltage-dividing sampling resistor (2), a ceramic tube (3), a first connecting wire (4), a second connecting wire (5), a third connecting wire (6), a first positioning plug (7), a positioning device (8), a third positioning plug (9) and a wire (10); One end of the first voltage-dividing sampling resistor (1), the second connecting wire (5) and one end of the second voltage-dividing sampling resistor (2) are connected in sequence and arranged inside the ceramic tube (3); The first positioning plug (7) is arranged at the other end of the first voltage-dividing sampling resistor (1); The positioning device (8) is arranged between the first voltage-dividing sampling resistor (1) and the second voltage-dividing sampling resistor (2); The third positioning plug (9) is arranged at the other end of the second voltage-dividing sampling resistor (2); The first connecting wire (4) passes through the first positioning plug (7), one end is connected to the other end of the first voltage-dividing sampling resistor (1), and the other end extends out of the first positioning plug (7); The third connecting wire (6) passes through the third positioning plug (9), one end is connected to the other end of the second voltage-dividing sampling resistor (2), and the other end extends out of the third positioning plug (9); One end of the wire (10) is connected to the second connecting wire (5), and the other end of the wire (10) passes through and extends out of the third positioning plug (9) or the first positioning plug (7); It further includes a wire fixing device (11), and the wire fixing device (11) is arranged at the gap between the first voltage-dividing sampling resistor (1) and the second voltage-dividing sampling resistor (2); It further includes a plurality of silica gel sealing rings (12); the plurality of silica gel sealing rings (12) are respectively arranged between the first positioning plug (7), the positioning device (8), the third positioning plug (9), the wire fixing device (11) and the inner wall of the ceramic tube (3); The resistance value of the first voltage-dividing sampling resistor (1) is 5 to 100 times that of the second voltage-dividing sampling resistor (2).

2. A high-voltage sampling resistor device, characterized in that, it includes a high-voltage sampling resistor assembly (13), a first insulating bracket (14) and a second insulating bracket (15); The high-voltage sampling resistor assembly (13) is a high-voltage sampling resistor assembly as described in claim 1; The number of the high-voltage sampling resistor assemblies (13) is 3; One end of each of the high-voltage sampling resistor assemblies (13) is connected to the first insulating bracket (14); the other end of each of the high-voltage sampling resistor assemblies (13) is connected to the second insulating bracket (15).

3. According to a high-voltage sampling resistor device as described in claim 2, characterized in that, The first connecting wire (4) or the third connecting wire (6) at one end of the high-voltage sampling resistor assembly (13) all pass through the first insulating bracket (14).

4. According to a high-voltage sampling resistor device as described in claim 2, characterized in that, it further includes a first side insulating bracket (16) and a second side insulating bracket (17); One end of the first side insulating bracket (16) is connected to one end of the first insulating bracket (14), and the other end of the first side insulating bracket (16) is connected to one end of the second insulating bracket (15); One end of the second-side insulating bracket (17) is connected to the other end of the first insulating bracket (14), and the other end of the second-side insulating bracket (17) is connected to the other end of the second insulating bracket (15).

5. A high-voltage sampling resistor device according to claim 2, characterized in that, it further comprises a grounding copper bar (18), a voltage-dividing sampling board (19) and a TVS tube (20); The grounding copper bar (18) is arranged on the first insulating bracket (14); The voltage-dividing sampling board (19) is arranged on the grounding copper bar (18); The TVS tube (20) is arranged on the voltage-dividing sampling board (19).

6. A high-voltage sampling resistor device according to claim 5, characterized in that, it further comprises a plurality of grounding nuts (21), and the plurality of grounding nuts (21) are respectively arranged on the grounding copper bar (18) and the voltage-dividing sampling board (19).

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