Rapid measuring tool for shaft voltage of generator

Abstract

The utility model relates to a quick measuring tool for shaft voltage of a generator. The quick measuring tool comprises a mobile vehicle, and a measuring mechanism and a winding mechanism which are arranged on the mobile vehicle, the measuring mechanism comprises a first measuring rod, a second measuring rod and a universal meter for measuring voltage; the universal meter is provided with a first wiring terminal and a second wiring terminal, the binding post of the first measuring rod is in circuit connection with the first wiring terminal, the binding post of the second measuring rod is in circuit connection with the second wiring terminal, the second wiring terminal is in circuit connection with the measuring clamp, and a normally open switch is installed between the second wiring terminal and the measuring clamp. According to the utility model, the measurement work efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of generator shaft voltage measurement, in particular to a generator shaft voltage quick measurement tool. Background Art

[0002] Generator sets (including steam turbine generators, hydro-turbine generators, synchronous compensators), especially steam turbine generator sets, generate potential on the shaft of the generator set due to the unbalanced magnetic flux of the motor, the magnetization of the motor shaft, and static charging. If adequate measures are not taken during installation or operation, when the generator shaft voltage is too high and is enough to break through the oil film between the shaft and the bearing, discharge will occur, which will gradually deteriorate the lubricating and cooling oil and burn the shaft neck and bearing. In severe cases, the machine will be forced to shut down and cause an accident. Therefore, it is necessary to measure the generator shaft voltage regularly.

[0003] At present, before measuring the generator shaft voltage, the original grounding protection carbon brush on the shaft is lifted, and the shaft and bearing on both sides of the generator are short-circuited with copper brushes during measurement to eliminate the pressure drop of the oil film. The voltage U1 at both ends of the generator shaft is first measured, and after measuring U1, the connection is reconnected, and then the generator bearing and shaft are short-circuited through the copper brush, and the voltage U2 between the bearing bracket and the ground is measured on the exciter side. Since the current measurement tools cannot meet the requirements of high efficiency and professionalism, the wiring takes a long time, the measurement efficiency is very low, and a lot of time is spent on wiring and preparation. Therefore, there is an urgent need for a generator shaft voltage measurement tool that is easy to use, fast and efficient in measurement. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a quick generator shaft voltage measurement tool.

[0005] The utility model is realized through the following technical scheme, and provides a generator shaft voltage quick measurement tool, comprising a mobile vehicle and a measuring mechanism and a winding mechanism installed on the mobile vehicle; the measuring mechanism comprises a first measuring rod, a second measuring rod and a multimeter for voltage measurement; a first wiring terminal and a second wiring terminal are arranged on the multimeter, the wiring post of the first measuring rod is connected to the first wiring terminal circuit, the wiring post of the second measuring rod is connected to the second wiring terminal circuit, the second wiring terminal is connected to the measuring clamp circuit, and a normally open switch is installed between the second wiring terminal and the measuring clamp.

[0006] Preferably, the mobile vehicle includes a vertical board and a multi-layer storage table fixed on one side of the vertical board.

[0007] Preferably, the storage platform is a three-layered storage platform arranged in parallel, and a moving wheel is installed at the bottom of the lowest storage platform to facilitate the movement and transfer of the utility model. The three-layer storage platform is connected and fixed by side panels on both sides to enhance the stability of the storage platform. A handle is installed at the upper end of one side panel to facilitate the staff to push the mobile vehicle through the handle. Some maintenance and measurement tools can be placed on the storage platform.

[0008] Preferably, the first measuring rod and the second measuring rod are both telescopic rods with a hollow interior, a terminal is fixed at the outer rod end of the telescopic rod, a copper brush is fixed at the inner rod end of the telescopic rod, and the copper brush and the terminal are connected by a wire. The wire is located inside the telescopic rod and has a surplus length, so as not to affect the extension of the telescopic rod.

[0009] Preferably, in order to ensure better contact between the copper brush and the shaft during measurement, the copper brush is fixed to the end of the inner rod at an angle of 45°.

[0010] Preferably, an insulating sleeve is fixed on the outer rod of the telescopic rod to facilitate the staff to hold it.

[0011] Preferably, a fixing clamp is connected to the first measuring rod, and the excitation side bearing bracket is clamped by the fixing clamp during measurement, and the measuring clamp is clamped to the generator base. The fixing clamp is used for fixing during measurement, and the measuring clamp is used for grounding during measurement.

[0012] Preferably, the multimeter is placed on a storage table for easy storage and transfer.

[0013] Preferably, the winding mechanism comprises a first winding drum and a second winding drum, and the first winding drum and the second winding drum are rotatably mounted on the vertical plate via a rotating shaft respectively.

[0014] Preferably, the terminal of the first measuring rod is connected to the first terminal circuit via a first wire, the terminal of the second measuring rod is connected to the second terminal circuit via a second wire, and the second terminal is further connected to the measuring clamp circuit via a third wire.

[0015] Preferably, the first electric wire, the second electric wire and the third electric wire each include a winding section and a non-winding section.

[0016] Preferably, the winding section of the first electric wire is wound on the first winding reel, one end of the winding section of the first electric wire is fixed to the first winding reel and connected to the first socket, the first socket is installed on the first winding reel and rotates with the rotation of the first winding reel, and the other end of the winding section of the first electric wire is connected to the terminal of the first measuring rod; one end of the non-winding section of the first electric wire is plugged into the first socket through a plug, and the other end is connected to the first terminal.

[0017] Preferably, the winding sections of the second wire and the third wire are wound on the second winding reel, one end of the winding section of the second wire and the winding section of the third wire are respectively fixed to the second winding reel and connected to the second socket, the second socket is installed on the second winding reel and rotates with the rotation of the second winding reel, the other end of the winding section of the second wire is connected to the terminal of the second measuring rod, and the other end of the winding section of the third wire is connected to the measuring clamp; one end of the non-winding section of the second wire and the non-winding section of the third wire are respectively plugged into the second socket through a plug, and the other end of the non-winding section of the second wire and the non-winding section of the third wire are both connected to the second terminal. The winding section of the first wire can be retracted and released by rotating the first winding reel, and the winding sections of the second wire and the third wire can be retracted and released by rotating the second winding reel, which is convenient for organizing and storing the lines, easy to operate, and saves time and effort.

[0018] Preferably, a slot for placing the first measuring rod and the second measuring rod is fixed on the vertical plate. When no measurement is performed, the first measuring rod and the second measuring rod are placed on the slot.

[0019] Preferably, in order to facilitate the measurement work, lighting lamps are fixedly installed on the outer rods of the first measuring rod and the second measuring rod to facilitate lighting during the measurement work.

[0020] The beneficial effects of the utility model are:

[0021] 1. When the generator shaft voltage is measured by the utility model, after U1 is measured, there is no need to reconnect the wires. U2 can be measured by simply pressing the normally open switch to switch the circuit, which greatly shortens the time for the measurement work.

[0022] 2. The utility model does not need to spend a lot of time on preparation work such as wire management, wiring, wiring, and wire collection, which saves a lot of measurement preparation and storage time; the utility model reduces the preparation time for each measurement from 1 hour to 20 minutes, and the operation time for each measurement from 20 minutes to 5 minutes, greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the mobile vehicle of the utility model;

[0024] Figure 2 This is a front view structural schematic diagram of the utility model;

[0025] Figure 3 It is a rear view structural schematic diagram of the utility model;

[0026] Figure 4 It is a schematic diagram of the structure of the first measuring rod or the second measuring rod of the utility model;

[0027] Figure 5It is a schematic diagram of the connection relationship of various components in the measuring mechanism of the utility model;

[0028] As shown in the figure:

[0029] 1. Vertical board, 2. Storage table, 3. Moving wheels, 4. Side panel, 5. Handle, 6. First measuring rod, 7. Second measuring rod, 8. Multimeter, 9. Terminal block, 10. Copper brush, 11. Insulating sleeve, 12. First terminal block, 13. Second terminal block, 14. Normally open switch, 15. Fixing clip, 16. Measuring clip, 17. First winding reel, 18. Second winding reel, 19. Card slot. DETAILED DESCRIPTION

[0030] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0031] like Figure 1-3 As shown, the utility model comprises a moving vehicle and a measuring mechanism and a winding mechanism installed on the moving vehicle.

[0032] The mobile vehicle includes a vertical plate 1 and a multi-layer storage platform 2 fixed on one side of the vertical plate 1. In this embodiment, the storage platform 2 is three layers arranged in parallel. A moving wheel 3 is installed at the bottom of the lowest storage platform 2 to facilitate the movement and transfer of the utility model. The three-layer storage platform 2 is connected and fixed by side panels 4 on both sides to enhance the stability of the storage platform 2. A handle 5 is installed at the upper end of one side panel 4 to facilitate the staff to push the mobile vehicle through the handle 5. Some maintenance and measurement tools can be placed on the storage platform 2.

[0033] The measuring mechanism includes a first measuring rod 6, a second measuring rod 7 and a multimeter 8 for voltage measurement. Figure 4 As shown, the first measuring rod 6 and the second measuring rod 7 are both telescopic rods with a hollow interior. A terminal 9 is fixed at the end of the outer rod of the telescopic rod, and a copper brush 10 is fixed at the end of the inner rod of the telescopic rod. The copper brush 10 and the terminal 9 are connected by a wire. The wire is located inside the telescopic rod and the wire length is redundant, which does not affect the extension of the telescopic rod. In order to better contact the copper brush 10 with the shaft during measurement, the copper brush 10 is fixed at the end of the inner rod at a 45° angle. An insulating sleeve 11 is fixed on the outer rod of the telescopic rod to facilitate the staff to hold it.

[0034] like Figure 5As shown, the multimeter 8 is provided with a first terminal 12 and a second terminal 13, the terminal 9 of the first measuring rod 6 is connected to the first terminal 12, the terminal 9 of the second measuring rod 7 is connected to the second terminal 13, the second terminal 13 is connected to the measuring clamp 16, and a normally open switch 14 is installed between the second terminal 13 and the measuring clamp 16. The first measuring rod 6 is connected with a fixing clamp 15, and the excitation side bearing bracket is clamped by the fixing clamp 15 during measurement, and the measuring clamp 16 is clamped to the generator base. The fixing clamp 15 is used for fixing during measurement, and the measuring clamp 16 is used for grounding during measurement.

[0035] In this embodiment, the multimeter 8 is placed on the storage table 2 for easy storage and transfer. The winding mechanism includes a first winding reel 17 and a second winding reel 18, and the first winding reel 17 and the second winding reel 18 are respectively rotatably mounted on the vertical plate 1 through a rotating shaft. The terminal 9 of the first measuring rod 6 is connected to the first terminal 12 through a first wire, and the terminal 9 of the second measuring rod 7 is connected to the second terminal 13 through a second wire. The second terminal 13 is also connected to the measuring clamp 16 through a third wire.

[0036] The first electric wire, the second electric wire and the third electric wire all include a winding section and a non-winding section, and the winding section of the first electric wire is wound on the first winding drum 17. One end of the winding section of the first electric wire is fixed to the first winding drum 17 and connected to the first socket, the first socket is installed on the first winding drum 17 and rotates with the rotation of the first winding drum 17, and the other end of the winding section of the first electric wire is connected to the terminal 9 of the first measuring rod 6. One end of the non-winding section of the first electric wire is plugged into the first socket through a plug, and the other end is connected to the first terminal 12.

[0037] The winding sections of the second electric wire and the third electric wire are wound on the second winding drum 18. One end of the winding section of the second electric wire and the winding section of the third electric wire are respectively fixed to the second winding drum 18 and connected to the second socket, the second socket is installed on the second winding drum 18 and rotates with the rotation of the second winding drum 18, the other end of the winding section of the second electric wire is connected to the terminal 9 of the second measuring rod 7, and the other end of the winding section of the third electric wire is connected to the measuring clamp 16. One end of the non-winding section of the second electric wire and the non-winding section of the third electric wire are respectively plugged into the second socket through a plug, and the other end of the non-winding section of the second electric wire and the non-winding section of the third electric wire are both connected to the second terminal 13. The winding section of the first electric wire can be retracted and released by rotating the first winding drum 17, and the winding section of the second electric wire and the third electric wire can be retracted and released by rotating the second winding drum 18, which is convenient for the arrangement and storage of the lines, easy to operate, and saves time and effort.

[0038] A slot 19 for placing the first measuring rod 6 and the second measuring rod 7 is also fixed on the vertical plate 1. When not measuring, the first measuring rod 6 and the second measuring rod 7 are placed on the slot 19. In this embodiment, in order to facilitate the measurement work, lighting lamps are fixedly installed on the outer rods of the first measuring rod 6 and the second measuring rod 7 to facilitate the lighting during the measurement work.

[0039] Specific measurement work:

[0040] 1) Clamp the fixing clamp 15 to the bearing bracket on the excitation side, and clamp the measuring clamp 16 to the generator base on the turbine side;

[0041] 2) Lift the original grounding protection carbon brush on the shaft, make the copper brush 10 of the first measuring rod 6 contact the shaft on the excitation side, and make the copper brush 10 of the second measuring rod 7 contact the shaft on the turbine side;

[0042] 3) Turn on the multimeter 8 switch and measure U1;

[0043] 4) Press the normally open switch 14 and measure U2;

[0044] 5) Stop the first measuring rod 6 and the second measuring rod 7 from contacting the generator shaft, remove the measuring clamp 16 and the fixing clamp 15, restore the grounding carbon brush, turn off the multimeter 8, and the measurement is finished;

[0045] 6) Compare the U1 value and the U2 value. The U1 value and the U2 value should be almost equal. If U1>U2, and the U1 value exceeds 10% of the U2 value, it means that the bearing insulation is poor.

[0046] When the shaft voltage of the generator is measured by the utility model, there is no need to rewire after U1 is measured, and U2 can be measured by pressing the normally open switch 14 to switch the circuit, which greatly shortens the time for the measurement work; the utility model does not need to spend a lot of time on preparation work such as line management, wiring, wiring, and line collection, which saves a lot of measurement preparation and storage time; the utility model reduces the preparation time for each measurement from 1 hour to 20 minutes, and reduces the operation time for each measurement from 20 minutes to 5 minutes, which greatly improves work efficiency.

[0047] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A quick generator shaft voltage measurement tool, characterized by: It comprises a mobile vehicle and a measuring mechanism and a winding mechanism installed on the mobile vehicle; the measuring mechanism comprises a first measuring rod, a second measuring rod and a multimeter for voltage measurement; a first wiring terminal and a second wiring terminal are arranged on the multimeter, the wiring post of the first measuring rod is connected to the first wiring terminal circuit, the wiring post of the second measuring rod is connected to the second wiring terminal circuit, the second wiring terminal is connected to the measuring clamp circuit, and a normally open switch is installed between the second wiring terminal and the measuring clamp.

2. A generator shaft voltage quick measurement tool according to claim 1, characterized in that: The mobile vehicle comprises a vertical plate and a multi-layer storage table fixed on one side of the vertical plate.

3. A generator shaft voltage quick measurement tool according to claim 1, characterized in that: The first measuring rod and the second measuring rod are both telescopic rods with hollow interiors. A terminal is fixed at the outer rod end of the telescopic rod, and a copper brush is fixed at the inner rod end of the telescopic rod. The copper brush and the terminal are connected by a wire.

4. A generator shaft voltage quick measurement tool according to claim 1, characterized in that: The winding mechanism comprises a first winding drum and a second winding drum, and the first winding drum and the second winding drum are rotatably mounted on the vertical plate through a rotating shaft respectively.

5. A generator shaft voltage quick measurement tool according to claim 4, characterized in that: The terminal of the first measuring rod is connected to the first terminal circuit via a first wire, the terminal of the second measuring rod is connected to the second terminal circuit via a second wire, and the second terminal is further connected to the measuring clamp circuit via a third wire.

6. A generator shaft voltage quick measurement tool according to claim 5, characterized in that: The first electric wire, the second electric wire, and the third electric wire each include a wound section and a non-wound section.

7. A generator shaft voltage quick measurement tool according to claim 6, characterized in that: The winding section of the first electric wire is wound on the first winding reel, one end of the winding section of the first electric wire is fixed to the first winding reel and connected to the first socket, the first socket is installed on the first winding reel and rotates with the rotation of the first winding reel, the other end of the winding section of the first electric wire is connected to the terminal of the first measuring rod; one end of the non-winding section of the first electric wire is plugged into the first socket through a plug, and the other end is connected to the first terminal.

8. A generator shaft voltage quick measurement tool according to claim 6, characterized in that: The winding sections of the second electric wire and the third electric wire are wound on the second winding reel, one ends of the winding sections of the second electric wire and the third electric wire are respectively fixed to the second winding reel and connected to the second socket, the second socket is installed on the second winding reel and rotates with the rotation of the second winding reel, the other end of the winding section of the second electric wire is connected to the terminal of the second measuring rod, and the other end of the winding section of the third electric wire is connected to the measuring clamp; one ends of the non-winding section of the second electric wire and the non-winding section of the third electric wire are respectively plugged into the second socket through plugs, and the other ends of the non-winding section of the second electric wire and the non-winding section of the third electric wire are both connected to the second terminal.

9. A generator shaft voltage quick measurement tool according to claim 1, characterized in that: A slot for placing the first measuring rod and the second measuring rod is also fixed on the vertical plate.

Images