Insulation resistance and dielectric loss tester for electrical equipment

Abstract

The utility model relates to the technical field of electrical equipment testers, in particular to an insulation resistance and dielectric loss tester for electrical equipment, which switches direct current and alternating current through a rotating device and increases the stability of the equipment through a contact device. The distance between the discharge conductor and the grounding conductor on the equipment is adjusted through the adjusting device; comprising an insulating bin, an alternating-current contact, a sampling resistor, a rectifier diode, a filter capacitor, a grounding binding post, a discharge conductor and a direct-current contact, the alternating-current contact is installed on the left portion in the insulating bin, the sampling resistor, the rectifier diode and the filter capacitor are installed in the middle in the insulating bin, and the discharge conductor and the direct-current contact are installed on the right portion in the insulating bin. A grounding binding post is arranged at the right part of the rear side surface of the insulating bin; the plurality of groups of binding posts and the electrical element penetrate through the upper end surface of the insulating bin through the upper parts of a circuit, an alternating-current contact, a discharge conductor and a direct-current contact and extend to the upper side of the insulating bin; comprising a rotating device, a contact device and an adjusting device.

Description

Technical Field

[0001] This utility model relates to the technical field of electrical equipment testers, and in particular to an insulation resistance and dielectric loss tester for electrical equipment. Background Technology

[0002] Measuring insulation resistance requires an insulation resistance tester and a dedicated test cable, while measuring dielectric loss requires a dielectric loss tester and a dedicated test cable. Power systems frequently require both measurements on the same sample. When measurements are needed, test personnel must carry at least two instruments to complete the work. Due to the large number of instruments, high-altitude wiring is cumbersome and labor-intensive. Dielectric loss typically requires 10kV AC high-voltage measurement, and high-end insulation resistance testers also use 10kV DC high-voltage measurement. Adding insulation resistance measurement functionality to a traditional dielectric loss tester presents the challenge of generating DC high voltage and switching between AC and DC high voltage. Because of the significant voltage difference between AC and DC, using traditional high-voltage relays would occupy a large space and be very costly, making it practically impractical, and the design and selection of DC high-voltage circuits would be out of the question.

[0003] The existing Chinese utility model patent with application number CN201720127917.7 relates to a dielectric loss tester with insulation resistance measurement function, including an input high voltage line, AC contact, moving contact, output high voltage line, DC contact, discharge conductor, grounding conductor, grounding contact and insulating plate, etc. It has the characteristics of reasonable design, small size and convenient use. The upper part of the insulating plastic box is equipped with an insulating baffle, which effectively increases the creepage distance.

[0004] However, in actual use, the terminal of the output high-voltage line of the above device will rotate continuously with the insulating rocker arm. During continuous use, the connection stability between the insulating rocker arm and the output high-voltage line decreases, which can easily lead to unstable line current. After long-term use, the metal wire end will age after continuous swinging, which can easily lead to loosening and safety hazards. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides an insulation resistance and dielectric loss tester for electrical equipment that uses a rotating device to switch between DC and AC power, employs manual operation to increase equipment stability, uses a contact device to increase the stability of equipment connections, and uses an adjustment device to facilitate the operator in adjusting the distance between the discharge conductor and the grounding conductor on the equipment, thereby improving the practicality of the device.

[0006] This utility model discloses an insulation resistance and dielectric loss tester for electrical equipment, comprising an insulating chamber, AC contacts, a sampling resistor, a rectifier diode, a filter capacitor, a grounding terminal, a discharge conductor, and a DC contact. The AC contact is installed on the left side of the insulating chamber, the sampling resistor, rectifier diode, and filter capacitor are installed in the middle of the insulating chamber, and the discharge conductor and DC contact are installed on the right side of the insulating chamber. A grounding terminal is located on the right side of the rear side of the insulating chamber. Multiple sets of terminals and electrical components are connected by circuits. The upper parts of the AC contact, discharge conductor, and DC contact all extend through the upper end face of the insulating chamber to the upper side of the insulating chamber. The device includes a rotating device, a contacting device, and an adjusting device. The contacting device is mounted on the rotating device, and the adjusting device is also mounted on the rotating device. The rotating device switches between DC and AC power and is operated manually, increasing the stability of the equipment. The contacting device increases the stability of the equipment connection. The adjusting device allows the operator to adjust the distance between the discharge conductor and the grounding conductor on the equipment, improving the practicality of the device.

[0007] Preferably, the rotating device includes a rotating shaft, an insulating swing arm, a fixed frame, a V-shaped push rod, a limiting groove, a metal limiting rod, and an insulating housing. The insulating chamber and grounding terminal are both installed on the lower end face of the insulating housing. The rotating shaft is mounted on the rear of the lower end face of the insulating housing via bearings. The upper end face of the rotating shaft is connected to the rear of the insulating swing arm. The lower part of the rotating shaft extends through the lower end face of the insulating housing to the lower side of the insulating housing and connects to the V-shaped push rod. A fixed frame is provided at the rear of the lower end face of the insulating housing. The lower end face of the rotating shaft is connected to the fixed frame via bearings. The lower end face of the insulating housing is positioned to the left and right of the fixed frame. Each device is equipped with a set of metal limiting rods, and a set of limiting grooves are respectively provided on the two rotating ends of the V-shaped push rod at the positions corresponding to the positions of the metal limiting rods. By pushing the V-shaped push rod, the rotating shaft is driven to rotate, which in turn drives the insulating swing arm to rotate on the insulating chamber. The device switches between DC and AC power, and relies on manual operation by the operator, which increases the reliability of the equipment. The limiting grooves on the V-shaped push rod and the metal limiting rods limit the swing amplitude of the insulating swing arm, preventing excessive force during rotation from causing collisions and damage between the equipment, thus improving the practicality of the device.

[0008] Preferably, it also includes an arc-shaped magnet, which is provided on the inner side of the limiting groove; the arc-shaped magnet provided on the inner side of the limiting groove attracts the metal limiting rod, thereby increasing the connection stability between the power supplies, reducing the impact of external vibrations on the power supply connection stability, and improving the practicality of the device.

[0009] Preferably, the contact device includes a wiring hole, a wiring bolt, a contact groove, and an arc-shaped contact. A wiring hole and a wiring bolt are provided on one side of the swing end of the upper end face of the insulating swing arm. The wiring bolt is located above the wiring hole, and its movable end can move into the wiring hole. A set of contact grooves are provided on the left and right sides of the swing end of the insulating swing arm. When the insulating swing arm swings to the DC or AC contact, the DC and AC contacts are located in the two sets of contact grooves of the insulating swing arm, respectively. An arc-shaped contact is provided on the concave arc surface of the contact groove. The metal core of the output cable is inserted into the wiring hole, and then the wiring bolt is rotated to complete the connection between the output cable and the wiring hole. The concave structure of the contact groove on the insulating swing arm, combined with the arc-shaped contact, increases the contact area and contact stability, improving the practicality of the device.

[0010] Preferably, the device also includes a support frame and a fixing claw. A support frame is installed in the middle of the upper end face of the insulating swing arm, and a fixing claw is provided on the upper part of the support frame. The front end of the fixing claw is fastened to the output cable by bolts and nuts. The main body of the output cable with insulation layer is inserted into the fixing claw, and then the output cable is fixed by bolts and nuts so that the fixing claw fixes the main body of the output cable. Since the support frame rotates with the insulating swing arm, the fixed end of the main body of the output cable and the terminal of the output cable are fixed relative to the insulating swing arm during the movement of the insulating swing arm. This reduces the possibility of the terminal of the output cable becoming loose or the metal aging during the swing of the insulating swing arm, and improves the connection stability and practicality of the equipment.

[0011] Preferably, the adjustment device includes an adjustment groove, a slider, a grounding conductor, a fastening bolt, and a spring grounding wire. An adjustment groove is provided on the right side of the upper end face of the insulating chamber. Sliding grooves are respectively provided on the left and right sides of the adjustment groove. The slider is located inside the adjustment groove, and a set of limiting sliders is provided on each of the two sets of sliding grooves corresponding to the left and right ends of the slider. A grounding conductor and a fastening bolt are provided on the upper end face of the slider. The grounding conductor is connected to the grounding terminal via the spring grounding wire. The position of the slider in the adjustment groove is adjusted according to power requirements, thereby adjusting the distance between the discharge conductor and the grounding conductor. The position of the slider is fixed by rotating the fastening bolt, reducing the labor intensity of the operator and improving the practicality of the device.

[0012] Preferably, it also includes a sealing cap and a shaped connector tube. The sealing cap is installed on the upper surface of the insulating box, and the shaped connector tube is connected to the upper surface of the sealing cap. The lower port of the shaped connector tube is located on the upper side of the AC contact and the DC contact, respectively. The sealing cap works with the insulating box to seal the inside of the insulating box, increasing the safety of the equipment. The shaped connector tube fixes the upper position of the output cable, reducing the vibration amplitude of the output cable located outside the insulating box during the swing of the insulating arm, thus improving the stability of the device.

[0013] Compared with the prior art, the advantages of this utility model are as follows: the switching between DC and AC power is achieved through a rotating device and the manual operation method increases the stability of the equipment; the stability of the equipment connection is increased through a contact device; and the distance between the discharge conductor and the grounding conductor on the equipment is easily adjusted by the operator through an adjustment device, thus improving the practicality of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first isometric structure of this utility model;

[0015] Figure 2 This is a structural schematic diagram of the sealing cover and the insulating box body of this utility model in the separated state;

[0016] Figure 3 This is a first cross-sectional structural diagram of the present invention;

[0017] Figure 4 This is a schematic diagram of the second cross-sectional structure of this utility model;

[0018] Figure 5 yes Figure 3 A magnified structural diagram of part A in the middle;

[0019] The following are labels in the attached diagram: 1. Insulating chamber; 2. AC contact; 3. Sampling resistor; 4. Rectifier diode; 5. Filter capacitor; 6. Grounding terminal; 7. Discharge conductor; 8. DC contact; 9. Rotating shaft; 10. Insulating swing arm; 11. Fixing frame; 12. V-shaped push rod; 13. Limiting groove; 14. Metal limiting round rod; 15. Insulating box; 16. Arc-shaped magnet; 17. Wiring hole; 18. Wiring bolt; 19. Contact groove; 20. Arc-shaped contact; 21. Support frame; 22. Fixing claw; 23. Adjustment groove; 24. Slider; 25. Grounding conductor; 26. Fastening bolt; 27. Spring grounding wire; 28. Sealing cover; 29. ​​Irregularly shaped connector tube. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0021] Example

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 The contact device shown is mounted on the rotating device, and the adjusting device is mounted on the rotating device.

[0023] First, adjust the position of slider 24 in adjustment groove 23 according to power requirements to adjust the distance between discharge conductor 7 and ground conductor 25. Fix the position of slider 24 by rotating fastening bolt 26. Then, push V-shaped push rod 12 to drive rotating shaft 9 to rotate, thereby driving insulating swing arm 10 to rotate on insulating chamber 1. Switch between DC and AC power. Then, limit the swing amplitude of insulating swing arm 10 by limiting groove 13 and metal limiting round rod 14 on V-shaped push rod 12. The arc magnet 16 set on the inner side of limiting groove 13 can be attracted to metal limiting round rod 14.

[0024] The rotating device includes a rotating shaft 9, an insulating swing arm 10, a fixed frame 11, a V-shaped push rod 12, a limiting groove 13, a metal limiting round rod 14, and an insulating box 15. The insulating chamber 1 and the grounding terminal 6 are both installed on the lower end face inside the insulating box 15. The rotating shaft 9 is installed at the rear of the lower end face of the insulating box 15 through a bearing. The upper end face of the rotating shaft 9 is connected to the rear of the insulating swing arm 10. The lower part of the rotating shaft 9 passes through the lower end face of the insulating box 15 and extends to the lower side of the insulating box 15 to connect with the V-shaped push rod 12. A fixed frame 11 is provided at the rear of the lower end face of the insulating box 15. The lower end face of the rotating shaft 9 is connected to the fixed frame 11 through a bearing. A set of metal limiting round rods 14 are provided on the left and right sides of the lower end face of the insulating box 15. A set of limiting grooves 13 are provided on the two rotating end sides of the V-shaped push rod 12 corresponding to the positions of the metal limiting round rods 14.

[0025] It also includes an arc-shaped magnet 16, which is provided on the inner side of the limiting groove 13;

[0026] The contact device includes a wiring hole 17, a wiring bolt 18, a contact groove 19, and an arc-shaped contact 20. The wiring hole 17 and the wiring bolt 18 are provided on one side of the swing end of the upper end face of the insulating swing arm 10. The wiring bolt 18 is located on the upper side of the wiring hole 17, and the moving end of the wiring bolt 18 can move into the wiring hole 17. A set of contact grooves 19 are provided on the left and right sides of the swing end of the insulating swing arm 10. When the insulating swing arm 10 swings to the DC contact 8 or the AC contact 2, the DC contact 8 and the AC contact 2 are respectively located in the two sets of contact grooves 19 of the insulating swing arm 10. An arc-shaped contact 20 is provided on the concave arc surface of the contact groove 19.

[0027] It also includes a support frame 21 and a fixing claw 22. The support frame 21 is installed in the middle of the upper end face of the insulating swing arm 10. The fixing claw 22 is provided on the upper part of the support frame 21. The front end of the fixing claw 22 is fastened to the output cable by bolts and nuts.

[0028] The adjustment device includes an adjustment groove 23, a slider 24, a grounding conductor 25, a fastening bolt 26, and a spring grounding wire 27. The upper right side of the insulating chamber 1 is provided with an adjustment groove 23. Sliding grooves are provided on the left and right sides of the adjustment groove 23. The slider 24 is located inside the adjustment groove 23, and a set of limiting sliders is provided on the left and right sides of the slider 24 corresponding to the two sets of sliding grooves in the adjustment groove 23. The upper end of the slider 24 is provided with a grounding conductor 25 and a fastening bolt 26. The grounding conductor 25 is connected to the grounding terminal 6 through the spring grounding wire 27.

[0029] It also includes a sealing cover 28 and a shaped connector tube 29. The sealing cover 28 is installed on the upper end face of the insulating box 15. The shaped connector tube 29 is connected to the upper end face of the sealing cover 28. The lower port of the shaped connector tube 29 is located on the upper side of the AC contact 2 and the DC contact 8, respectively.

[0030] The device switches between DC and AC power via a rotating mechanism and is operated manually, which increases the stability of the equipment. The contact mechanism increases the stability of the equipment connection, and the adjustment mechanism allows the operator to easily adjust the distance between the discharge conductor 7 and the grounding conductor 25 on the equipment, thus improving the practicality of the device.

[0031] like Figures 1 to 5 As shown, the insulation resistance and dielectric loss tester for electrical equipment of this utility model, when in operation, first adjusts the position of the slider 24 in the adjustment groove 23 according to the power demand, thereby adjusting the distance between the discharge conductor 7 and the grounding conductor 25. The position of the slider 24 is fixed by rotating the fastening bolt 26. Then, the V-shaped push rod 12 is pushed to drive the rotating shaft 9 to rotate, which in turn drives the insulating swing arm 10 to rotate on the insulating chamber 1. The DC power and AC power are switched. Then, the swing amplitude of the insulating swing arm 10 is limited by the limiting groove 13 on the V-shaped push rod 12 and the metal limiting round rod 14. The arc-shaped magnet 16 set on the inner side of the limiting groove 13 is attracted to the metal limiting round rod 14.

[0032] The arc-shaped magnet 16 of the electrical equipment insulation resistance and dielectric loss tester of this utility model is commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An insulation resistance and dielectric loss tester for electrical equipment, comprising an insulation chamber (1), an AC contact (2), a sampling resistor (3), a rectifier diode (4), a filter capacitor (5), a grounding terminal (6), a discharge conductor (7), and a DC contact (8), wherein the AC contact (2) is installed on the left side of the insulation chamber (1), the sampling resistor (3), the rectifier diode (4), and the filter capacitor (5) are installed in the middle of the insulation chamber (1), the discharge conductor (7) and the DC contact (8) are installed on the right side of the insulation chamber (1), and a grounding terminal (6) is provided on the right side of the rear side of the insulation chamber (1), multiple sets of terminals and electrical components are connected by a circuit, and the upper parts of the AC contact (2), the discharge conductor (7), and the DC contact (8) all extend through the upper end face of the insulation chamber (1) to the upper side of the insulation chamber (1); characterized in that, It includes a rotating device, a contact device, and an adjusting device. The contact device is installed on the rotating device, and the adjusting device is installed on the rotating device. It also includes a support frame (21) and a fixing claw (22). The support frame (21) is installed in the middle of the upper end face of the insulating swing arm (10). The fixing claw (22) is provided on the upper part of the support frame (21). The front end of the fixing claw (22) is fastened by bolts and nuts.

2. The insulation resistance and dielectric loss tester for electrical equipment as described in claim 1, characterized in that, The rotating device includes a rotating shaft (9), an insulating swing arm (10), a fixed frame (11), a V-shaped push rod (12), a limiting groove (13), a metal limiting round rod (14), and an insulating box (15). The insulating chamber (1) and the grounding terminal (6) are both installed on the lower end face inside the insulating box (15). The rotating shaft (9) is installed on the rear part of the lower end face of the insulating box (15) through a bearing. The upper end face of the rotating shaft (9) is connected to the rear part of the insulating swing arm (10). The lower part of the rotating shaft (9) passes through the insulating box. The lower end face of the body (15) extends to the lower side of the insulating box (15) and is connected to the V-shaped push rod (12). A fixed frame (11) is provided at the rear of the lower end face of the insulating box (15). The lower end face of the rotating shaft (9) is connected to the fixed frame (11) through a bearing. A set of metal limiting round rods (14) are provided on the left and right sides of the lower end face of the insulating box (15). A set of limiting grooves (13) are provided on the two rotating end sides of the V-shaped push rod (12) corresponding to the positions of the metal limiting round rods (14).

3. The insulation resistance and dielectric loss tester for electrical equipment as described in claim 2, characterized in that, It also includes an arc-shaped magnet (16), and an arc-shaped magnet (16) is provided on the inner side of the limiting groove (13).

4. The insulation resistance and dielectric loss tester for electrical equipment as described in claim 3, characterized in that, The contact device includes a wiring hole (17), a wiring bolt (18), a contact groove (19), and an arc-shaped contact (20). The upper end face of the insulating swing arm (10) is provided with a wiring hole (17) and a wiring bolt (18). The wiring bolt (18) is located on the upper side of the wiring hole (17), and the moving end of the wiring bolt (18) can move into the wiring hole (17). A set of contact grooves (19) are provided on the left and right sides of the swing end of the insulating swing arm (10). When the insulating swing arm (10) swings to the DC contact (8) or the AC contact (2), the DC contact (8) and the AC contact (2) are located in the two sets of contact grooves (19) of the insulating swing arm (10). An arc-shaped contact (20) is provided on the concave arc surface of the contact groove (19).

5. The insulation resistance and dielectric loss tester for electrical equipment as described in claim 1, characterized in that, The adjustment device includes an adjustment groove (23), a slider (24), a grounding conductor (25), a fastening bolt (26), and a spring grounding wire (27). An adjustment groove (23) is provided on the right side of the upper end face of the insulating chamber (1). Sliding grooves are provided on the left and right sides of the adjustment groove (23). The slider (24) is located inside the adjustment groove (23), and a set of limiting sliders is provided on the left and right ends of the slider (24) corresponding to the two sets of sliding grooves in the adjustment groove (23). A grounding conductor (25) and a fastening bolt (26) are provided on the upper end face of the slider (24). The grounding conductor (25) is connected to the grounding terminal (6) through the spring grounding wire (27).

6. The insulation resistance and dielectric loss tester for electrical equipment as described in claim 5, characterized in that, It also includes a sealing cover (28) and a shaped connector tube (29). The sealing cover (28) is installed on the upper surface of the insulating box (15). The shaped connector tube (29) is connected to the upper surface of the sealing cover (28). The lower port of the shaped connector tube (29) is located on the upper side of the AC contact (2) and the DC contact (8), respectively.

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