A device for measuring the potential of a slot portion of a generator stator

Abstract

A kind of generator stator slot part potential measuring device.Currently, the line bar of stator slot part is tested to ground potential, and measurement personnel needs to wear insulating boots to enter the stator core, which is highly dangerous. The utility model discloses: sleeve and operating lever, the end of sleeve upper and lower sides is respectively hinged with one end of support arm, the operating lever is connected with the sleeve through bearing, the operating lever is threadedly connected with sliding sleeve, the sliding sleeve is connected with the middle part of support arm through connecting rod, the end of each support arm is hinged with measuring wheel group. The utility model is used for generator stator slot part potential measurement.

Description

Technical Field

[0001] This utility model relates to a potential measuring device for the stator slot of a generator. Background Technology

[0002] Excessive surface potential of the stator bars in the generator stator slots can lead to air ionization in the gaps, producing harmful gases. These gases, after a chemical reaction, cause electro-corrosion of the stator bar insulation, severely affecting its insulation strength. When generator stator bar slot wedges become loose, the anti-corona layer is damaged, or stator bars are replaced or repaired, a ground potential test should be performed on the stator bar sections to determine if the anti-corona layer is damaged and the contact condition between the anti-corona layer and the stator core. Currently, performing ground potential tests on the stator bar sections requires personnel wearing insulated boots to enter the stator core, which is highly dangerous. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a generator stator slot potential measuring device.

[0004] The above objectives are achieved through the following technical solutions: A generator stator slot potential measuring device comprises a sleeve and an operating rod. The upper and lower ends of the sleeve are respectively hinged to one end of a support arm. The operating rod is connected to the sleeve via a bearing. A sliding sleeve is threaded onto the operating rod. The sliding sleeve is connected to the middle of the support arm via a connecting rod. A measuring wheel set is hinged to the end of each support arm.

[0005] The generator stator slot potential measuring device includes a measuring wheel assembly comprising a wheel base, wherein the wheel base is connected to a support wheel and a copper wheel via a wheel axle, the wheel base is slidably connected to two support rods, and a retaining ring is fixed to the end of each support rod, wherein multiple copper plates arranged in a circular pattern are fixed on the retaining ring.

[0006] The generator stator slot potential measuring device is described above, with each of the support rods fitted with a spring. Beneficial effects

[0007] 1. This utility model is used for measuring the anti-corona layer potential of the stator slot section during generator stator bar maintenance. The device can adjust the position of the measuring wheel set by adjusting the support angle of the support arm, making it suitable for the distance between the upper and lower relative positions of the stator slot section. After the device is inserted, the measuring wheel set can contact the stator slot bar, eliminating the need for personnel to wear insulated boots to enter the stator, greatly reducing the risk of electric shock. It can simultaneously measure the potential of two stator slot bars that are upper and lower relative to each other.

[0008] 2. This utility model allows the device to be pushed within the generator stator by the operating lever of the handheld device, enabling measurement of different positions of the stator slot bars and improving measurement efficiency. Attached Figure Description

[0009] Appendix Figure 1 This is the front view of this utility model; Appendix Figure 2 This is a top view of the present invention; Appendix Figure 3 This is a side view of the present invention; Appendix Figure 4 It is attached Figure 1 Enlarged view of part A; Appendix Figure 5 It is attached Figure 2 Enlarged view of part B; Appendix Figure 6 This is a cross-sectional view of the present invention; Appendix Figure 7 This is a schematic diagram of the structure of this utility model in use; In the diagram: 1. Voltmeter; 2. Flexible wire; 3. Sleeve; 4. Operating lever; 5. Support arm; 6. Connecting rod; 7. Sliding sleeve; 8. Measuring wheel assembly; 9. Support wheel; 10. Wheel seat; 11. Support wheel shaft; 12. Copper sheet; 13. Copper wheel; 14. Fixed shaft; 15. Retaining ring; 16. Support rod; 17. Spring; 18. Polished rod section; 19. Screw section; 20. Generator stator; 21. Slotted rod; 22. Through hole; 23. Round hole. Detailed Implementation

[0010] Reference Figures 1-6 A generator stator slot potential measuring device comprises a sleeve 3 and an operating rod 4. The operating rod includes a smooth rod section 18 and a screw section 19. The operating rod is inserted into the sleeve and connected to the sleeve via a bearing. The upper and lower ends of the sleeve are respectively hinged to one end of a support arm 5. The operating rod is connected to the sleeve via a bearing. A sliding sleeve 7 is threaded onto the operating rod. The sliding sleeve is connected to the middle of the support arm via a connecting rod 6. A measuring wheel set 8 is hinged to the end of each support arm. Except for the copper wheel, copper sheet, and retaining ring, which are made of copper, the rest of the device is made of plastic. The measuring wheel set includes a wheel seat 10, which is connected to the support wheel 9 and the copper wheel 13 via axles. The wheel seat is slidably connected to two support rods 16. A retaining ring 15 is fixed to the end of each support rod, and multiple copper plates 12 arranged in a circle are fixed on the retaining ring.

[0011] The copper wheel is fixed at the center with a fixed shaft 14, which is also made of plastic. The fixed shaft passes through the through hole of the support and is threaded to the nut. The support wheel is a plastic wheel with a support wheel shaft 11 fixed at the center. The support wheel shaft is also made of plastic. The support wheel shaft passes through the through hole 22 of the wheel seat and is threaded to the nut. The diameters of the copper wheel and the support wheel are equal, and the centers of the wheel shafts are located on the same horizontal plane. The support rod is a plastic rod that passes through the round hole 23 on the wheel seat and is fixed to the retaining ring. The retaining ring is a circular ring structure made of copper. Multiple Ω-shaped copper plates arranged in a circle are fixed on the retaining ring. Each of the support rods is fitted with a spring 17. One end of the spring is fixed to the end of the support rod, and the other end is fixed to the wheel seat. Working principle: Refer to Figure 7 When measuring the potential of the stator slot bars in a generator, the measuring device is first inserted into the generator stator. Then, the operating lever is manually rotated; the operating lever is threaded onto a sliding sleeve, allowing the sleeve to slide. After sliding, the support arm rotates via a connecting rod until the measuring wheel assembly contacts the surface of the stator slot bars. One end of the flexible conductor is connected to a retaining ring, and the other end is connected to the metal probe of a high-resistance voltmeter 1, connected to the positive terminal of a multimeter. The negative terminal of the multimeter is grounded. Then, the rated AC power frequency line voltage is applied to the generator stator windings using the testing device. This testing device is an existing device used to measure the potential of the stator slot bars. Existing methods for measuring the positioning of the slot bars require this testing device to apply voltage; therefore, this testing device is not illustrated. After measuring one point of the bar using the voltmeter... After measuring the voltage at one position, continue to push the device inward by holding the operating lever to perform multi-point measurements. After the measurement is completed, pull the device out by holding it without rotating the operating lever. Keep the support arm in place and extend the device into other stator slots to measure the potential of other slot bar bars. Keeping the support arm in place ensures that the copper wheel and the surface of the stator bar are subjected to consistent force, further ensuring the accuracy and consistency of the measurement data. At the same time, this device can simultaneously measure the potential of bars in opposite upper and lower slots, improving measurement efficiency. With the copper wheel and support wheel, when measuring other points of the bar, you only need to push the device to roll. A spring is installed, and the spring is in a stretched state. Under the action of the spring, the copper plate of the retaining ring is always pressed into contact with the copper wheel, ensuring reliable contact.

Claims

1. A generator stator slot potential measuring device, characterized in that: It consists of a sleeve and an operating rod. The upper and lower ends of the sleeve are respectively hinged to one end of the support arm. The operating rod is connected to the sleeve through a bearing. A sliding sleeve is threaded onto the operating rod. The sliding sleeve is connected to the middle of the support arm through a connecting rod. Each end of the support arm is hinged with a measuring wheel set.

2. The generator stator slot potential measuring device according to claim 1, characterized in that: The measuring wheel assembly includes a wheel seat, which is connected to the support wheel and the copper wheel via an axle. The wheel seat is slidably connected to two support rods, and a retaining ring is fixed to the end of each support rod. Multiple copper plates arranged in a circular pattern are fixed on the retaining ring.

3. The generator stator slot potential measuring device according to claim 2, characterized in that: Each of the aforementioned support rods is fitted with a spring.

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