Hydraulic generator rotor automatic measurement power supply loop switching device and method

Abstract

The invention relates to a hydraulic generator rotor automatic measurement power supply loop switching device and method. Three low-voltage electrodes on one side of a shielding box are respectively connected with three motors through three low-voltage rotary telescopic rods; a high-voltage electrode on the other side of the shielding box is connected with the high-voltage rotary telescopic rod through a high-voltage nut, and the high-voltage electrode penetrates through the shielding box to be connected with one motor; a rotor test connector is arranged on the shielding box; the three low-voltage electrodes or the high-voltage electrodes are driven by the motor to conduct the rotor test connector to carry out a rotor direct-current resistance test, a rotor alternating-current impedance test, a rotor alternating-current withstand voltage test and a rotor insulation resistance test, so that potential safety hazards caused by multiple wiring and high-low voltage switching are avoided, and the test working efficiency and safety are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rotor preventive test detection, and relates to a device and method for automatically measuring a power supply circuit switching of a hydro-generator rotor. Background Art

[0002] The preventive test items for the rotor of the hydro-turbine generator include rotor DC resistance, rotor AC impedance, rotor AC withstand voltage, and rotor insulation resistance. Among them, the rotor DC resistance and rotor AC impedance tests are low-voltage tests, while the rotor AC withstand voltage test and rotor insulation resistance test are high-voltage tests. The rotor DC resistance test applies a 200A / 40V low-voltage DC power supply, and the rotor AC impedance test applies a 200V / 1A low-voltage AC power supply; the rotor AC withstand voltage test applies a 2.5kV / 2A high-voltage AC power supply, and the rotor insulation resistance test applies a 2.5kV / 6mA high-voltage DC power supply.

[0003] When the above-mentioned preventive test and inspection items are carried out on the hydro-turbine generator, multiple sets of test instruments are required, and the test lines need to be disconnected and connected multiple times. At the same time, it is also necessary to switch between high and low voltage. This operation not only increases the risk factor of the test, but also increases the test steps, reduces the work efficiency of the test personnel, and affects the accuracy of the test results. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for automatically measuring the power supply circuit switching of a hydro-turbine generator rotor, so as to realize automatic switching of the power supply circuits of rotor DC resistance, rotor AC impedance, rotor AC withstand voltage and rotor insulation resistance test items.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a hydro-turbine generator rotor automatic measurement power supply circuit switching device, three low-voltage electrodes on one side of the shielding box are respectively connected to three motors through three low-voltage rotating telescopic rods; the high-voltage electrode on the other side of the shielding box is connected to the high-voltage rotating telescopic rod through a high-voltage nut, and the high-voltage electrode passes through the shielding box and is connected to one of the motors; a rotor test connector is provided on the shielding box; the three low-voltage electrodes or the high-voltage electrodes are driven by the motor to conduct the rotor test connector to perform rotor DC resistance test, rotor AC impedance test, rotor AC withstand voltage test and rotor insulation resistance test.

[0006] The three low-voltage electrodes are respectively the first low-voltage electrode, the second low-voltage electrode and the third low-voltage electrode; the three motors are respectively the first motor, the second motor and the third motor; the first low-voltage electrode, the second low-voltage electrode and the third low-voltage electrode are respectively connected to the first motor, the second motor and the third motor through three low-voltage rotating telescopic rods.

[0007] The first motor, the second motor and the third motor are fixed to one side of the shielding box by a motor fixing seat and a bracket; two low-voltage limit screws, two low-voltage guide rods and a low-voltage current conducting column are arranged on the three low-voltage electrodes.

[0008] The shielding box is provided with low voltage connection holes a, b, c, d, e and f on one side facing the low voltage electrode; and high voltage connection holes g and h on the other side of the shielding box.

[0009] Two high-voltage connecting needle posts are provided at the upper and lower ends of the high-voltage electrode.

[0010] The low-voltage rotating telescopic rod and the high-voltage rotating telescopic rod are telescoped toward the shielding box.

[0011] The rotor test connector includes a rotor test connector A and a rotor test connector B. The rotor test connector A and the rotor test connector B are externally connected to a rotor test terminal for testing.

[0012] A shielding box cover is arranged on the upper side of the shielding box and connected to the socket base plate; a socket insulation layer is arranged between the socket base plate and the rotor test connector A and the rotor test connector B; a rotor connector socket core is arranged between the rotor test connector A and the rotor test connector B; and the rotor connector socket core and the external rotor test end form a test circuit.

[0013] The first motor and the second motor push the first low-voltage electrode and the second low-voltage electrode toward the shielding box to perform a rotor DC resistance test; the third motor pushes the third low-voltage electrode to perform a rotor AC impedance test; the third motor pushes the high-voltage electrode to perform a rotor AC withstand voltage test and a rotor insulation resistance test.

[0014] The switching method of the automatic measurement power supply circuit switching device for the hydro-generator rotor as described above comprises the following steps: S1, when performing the rotor DC resistance test, the first motor and the second motor are controlled to move toward the shielding box so that the low-voltage current conducting posts on the first low-voltage electrode and the second low-voltage electrode are pushed into the low-voltage connection holes a, b, c and d, so that the rotor test connector A and the rotor test connector B are connected to the 200A / 40V low-voltage DC power supply circuit; S2, when performing the rotor AC impedance test, the first motor and the second motor are programmed to contract in opposite directions, so that the first low-voltage electrode and the second low-voltage electrode are disconnected from the low-voltage connection holes a, b, c and d, and then the third motor is programmed to move toward the shielding box, so that the low-voltage current conduction column on the third low-voltage electrode is pushed into the low-voltage connection holes e and f, so that the rotor test connector A and the rotor test connector B are connected to the 200V / 1A low-voltage AC power supply circuit; S3, when the rotor AC withstand voltage test is performed, the program-controlled third motor contracts in the reverse direction, so that the third low-voltage electrode disconnects the low-voltage connection hole e and the low-voltage connection hole f, and the reverse contraction of the third motor continues until the high-voltage connection needle column on the high-voltage electrode at the other end of the third motor connects to the high-voltage connection hole g and the high-voltage connection hole h on the other side of the shielding box, so that the rotor test connector A and the rotor test connector B are connected to the 2.5kV / 2A high-voltage AC power supply circuit; S4, when the rotor insulation resistance test is carried out, the rotor switching device is in the high-voltage electrode push-in state. By switching the high-voltage relay, the rotor test connector A and the rotor test connector B are connected to the 2.5kV / 6mA high-voltage DC power supply circuit.

[0015] The main beneficial effects of the present invention are: By program-controlling the switching of the first low-voltage electrode, the second low-voltage electrode, the third low-voltage electrode, and the high-voltage electrode, the power supply circuit of the rotor DC resistance, rotor AC impedance, rotor AC withstand voltage, rotor insulation resistance and other test items can be automatically switched, and further, one-time wiring and one-key measurement can complete the rotor DC resistance, rotor AC impedance, rotor AC withstand voltage, rotor insulation resistance and other items. The switching device can improve the work efficiency of test personnel and improve the safety of the test.

[0016] All test items can be completed with one wiring, avoiding the potential safety hazards caused by multiple wiring and high and low voltage switching, and improving the safety of the test.

[0017] It can measure all test items with one click, avoid errors caused by multiple instrument replacements, multiple test item switching and multiple test operations, and improve the accuracy of the test.

[0018] Instead of simply stacking instruments, the turbine generator rotor switching device can reduce the size of the entire project and make it easier to carry.

[0019] All test operations are realized through program control. You can arbitrarily select a test item to test on the program interface, or realize automatic testing of the selected item through settings to improve test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 for Figure 1 Schematic side view of .

[0023] Figure 3 This is a state diagram of the third low-voltage electrode of the present invention when it is pushed in.

[0024] Figure 4 This is a state diagram of the high-voltage electrode of the present invention when it is pushed in.

[0025] Figure 5 It is the control principle diagram of the present invention.

[0026] In the figure: 1-first motor, 2-second motor, 3-third motor, 4-motor fixing seat, 5-bracket, 6-shielding box, 7-high voltage electrode, 8-shielding box cover, 9-socket bottom plate, 10-socket insulation layer, 11-rotor test connector A, 12-rotor test connector B, 13-rotor connector socket core, 14-first low voltage electrode, 15-second low voltage electrode, 16-third low voltage electrode, 17-low voltage current conduction column, 18-low voltage limit stud, 19-low voltage guide rod, 20-low voltage rotating telescopic rod, 21-high voltage rotating telescopic rod, 22-high voltage connecting needle column, 23-high voltage nut, 61-low voltage connecting hole a, 62-low voltage connecting hole b, 63-low voltage connecting hole c, 64-low voltage connecting hole d, 65-low voltage connecting hole e, 66-low voltage connecting hole f, 67-high voltage connecting hole g, 68-high voltage connecting hole h. DETAILED DESCRIPTION

[0027] like Figure 1~Figure 5 In the invention, a device for automatically measuring a power supply circuit switching of a hydro-turbine generator rotor is provided. Three low-voltage electrodes on one side of a shielding box 6 are respectively connected to three motors through three low-voltage rotating telescopic rods 20; a high-voltage electrode 7 on the other side of the shielding box 6 is connected to a high-voltage rotating telescopic rod 21 through a high-voltage nut 23, and the high-voltage electrode 7 passes through the shielding box 6 and is connected to one of the motors; a rotor test connector is provided on the shielding box 6; the three low-voltage electrodes or the high-voltage electrode 7 are driven by a motor to conduct the rotor test connector to perform a rotor DC resistance test, a rotor AC impedance test, a rotor AC withstand voltage test and a rotor insulation resistance test.

[0028] In the preferred scheme, the three low-voltage electrodes are respectively a first low-voltage electrode 14, a second low-voltage electrode 15 and a third low-voltage electrode 16; the three motors are respectively a first motor 1, a second motor 2 and a third motor 3; the first low-voltage electrode 14, the second low-voltage electrode 15 and the third low-voltage electrode 16 are respectively connected to the first motor 1, the second motor 2 and the third motor 3 through three low-voltage rotating telescopic rods 20.

[0029] Preferably, the first motor 1, the second motor 2 and the third motor 3 are all linear motors, and the first motor 1, the second motor 2 and the third motor 3 are electrically connected to the controller, and a control program is preset in the controller to control the movement of the first motor 1, the second motor 2 and the third motor 3 through the controller.

[0030] In the preferred solution, the first motor 1, the second motor 2, and the third motor 3 are fixed to one side of the shielding box 6 by a motor fixing base 4 and a bracket 5; two low-voltage limit studs 18, two low-voltage guide rods 19, and a low-voltage current conducting column 17 are provided on the three low-voltage electrodes.

[0031] In a preferred embodiment, the shielding box 6 is provided with low voltage connection holes a61, b62, c63, d64, e65 and f66 on the side facing the low voltage electrode; and high voltage connection holes g67 and h68 are provided on the other side of the shielding box 6.

[0032] In the preferred embodiment, the guide rod 19 passes through the low-voltage electrode 14 / 15 / 16, and the two ends are respectively connected to the motor 1 / 2 / 3 and the shielding box 6. The low-voltage current wire is welded into the low-voltage current conducting column 17 and connected to the low-voltage motor 14 / 15 / 16. The wires of the rotor test connector A11 and the rotor connector B12 are connected to the low-voltage connection hole a61, the low-voltage connection hole b62, the low-voltage connection hole c63, the low-voltage connection hole d64, the low-voltage connection hole e65, the low-voltage connection hole f66 and the high-voltage connection hole g67, the high-voltage connection hole h68 on the shielding box 6.

[0033] When it is necessary to conduct the low-voltage wiring, the low-voltage motor 1 / 2 / 3 works, the rotating telescopic rod 20 rotates and drives the low-voltage electrode 14 / 15 / 16 to move along the low-voltage guide rod 19 toward the shielding box 6, and stops moving when the low-voltage electrode contacts the low-voltage limit stud 18. At this moment, the two low-voltage current conduction columns 7 on each low-voltage electrode 14 / 15 / 16 are respectively contacted and conducted with the low-voltage connection hole a61 and the low-voltage connection hole b62, the low-voltage connection hole c63 and the low-voltage connection hole d64, the low-voltage connection hole e65, and the low-voltage connection hole f66 on the shielding box, and the current is then conducted through the low-voltage current wires of the low-voltage connection holes and the rotor test connector A11 and the rotor test connector B12. When the conduction needs to be disconnected, the low-voltage motor starts working, and the rotating telescopic rod 20 rotates to drive the low-voltage electrodes 14 / 15 / 16 to move along the low-voltage guide rod 19 away from the shielding box 6, and the two low-voltage conduction needles on each low-voltage electrode are disconnected from the corresponding low-voltage conduction holes on the shielding box 6, thereby achieving circuit disconnection.

[0034] In a preferred solution, two high-voltage connecting needle posts 22 are provided at the upper and lower ends of the high-voltage electrode 7 .

[0035] When it is necessary to conduct the high-voltage wiring, the nut 23 connected to the high-voltage motor rotates and works, the rotating telescopic rod 21 rotates and drives the high-voltage electrode 7 to move along the low-voltage guide rod 19 toward the shielding box 6, and the two high-voltage connection needles 22 on the high-voltage electrode 7 are connected and conducted with the high-voltage connection holes g67 and h68 on the shielding box 6, so that the high-voltage current is connected to the rotor test connector A11 and the rotor test connector B12 through the high-voltage connection needle and the high-voltage connection hole. Similarly, when it is necessary to disconnect the high-voltage wiring, the high-voltage motor works, the rotating telescopic rod 21 rotates and drives the high-voltage electrode 7 to move along the low-voltage guide rod 19 away from the shielding box 6, and the two high-voltage connection needles 22 on the pressure electrode 7 are disconnected from the high-voltage connection holes g67 and h68 on the shielding box 6, so that the high-voltage test circuit is disconnected.

[0036] In a preferred solution, the low-voltage rotating telescopic rod 20 and the high-voltage rotating telescopic rod 21 are telescoped toward the shielding box 6 .

[0037] In a preferred solution, the rotor test connector includes a rotor test connector A11 and a rotor test connector B12, and the rotor test connector A11 and the rotor test connector B12 are externally connected to a rotor test terminal for testing.

[0038] In the preferred scheme, a shielding box cover 8 is provided on the upper side of the shielding box 6 and is connected to the socket base plate 9; a socket insulation layer 10 is provided between the socket base plate 9 and the rotor test connector A11 and the rotor test connector B12; a rotor connector socket core 13 is provided between the rotor test connector A11 and the rotor test connector B12; the rotor connector socket core 13 and the external rotor test end form a test circuit.

[0039] In the preferred scheme, the first motor 1 and the second motor 2 push the first low-voltage electrode 14 and the second low-voltage electrode 15 toward the shielding box 6 to perform a rotor DC resistance test; the third motor 3 pushes the third low-voltage electrode 16 to perform a rotor AC impedance test; the third motor 3 pushes the high-voltage electrode 7 to perform a rotor AC withstand voltage test and a rotor insulation resistance test.

[0040] In a preferred solution, the switching method of the automatic measurement power supply circuit switching device of the hydro-generator rotor as described above comprises the following steps: S1, when performing the rotor DC resistance test, the first motor 1 and the second motor 2 are moved toward the shielding box 6 by program control so that the low-voltage current conducting column 17 on the first low-voltage electrode 14 and the second low-voltage electrode 15 are pushed into the low-voltage connection hole a61, the low-voltage connection hole b62, the low-voltage connection hole c63 and the low-voltage connection hole d64, so that the rotor test connector A11 and the rotor test connector B12 are connected to the 200A / 40V low-voltage DC power supply circuit; S2, when performing the rotor AC impedance test, the first motor 1 and the second motor 2 are programmed to contract in opposite directions, so that the first low-voltage electrode 14 and the second low-voltage electrode 15 are disconnected from the low-voltage connection holes a61, b62, c63 and d64, and then the third motor 3 is programmed to move toward the shielding box 6, so that the low-voltage current conducting column 17 on the third low-voltage electrode 16 is pushed into the low-voltage connection hole e65 and the low-voltage connection hole f66, so that the rotor test connector A11 and the rotor test connector B12 are connected to the 200V / 1A low-voltage AC power supply circuit; S3, when the rotor AC withstand voltage test is performed, the program-controlled third motor 3 contracts in the reverse direction, so that the third low-voltage electrode 16 disconnects the low-voltage connection hole e65 and the low-voltage connection hole f66, and the reverse contraction of the third motor 3 continues until the high-voltage connection needle column 22 on the high-voltage electrode 7 at the other end of the third motor 3 connects to the high-voltage connection hole g and the high-voltage connection hole h on the other side of the shielding box 6, so that the rotor test connector A11 and the rotor test connector B12 are connected to the 2.5kV / 2A high-voltage AC power supply circuit; S4, when the rotor insulation resistance test is performed, the rotor switching device is in the high-voltage electrode 7 pushed-in state, and the rotor test connector A11 and the rotor test connector B12 are connected to the 2.5kV / 6mA high-voltage DC power supply circuit by switching the high-voltage relay.

[0041] In the above method, all test items are completed by wiring once, avoiding the safety hazards caused by multiple wiring and high and low voltage switching, and improving the safety of the test; all test items are measured with one button, avoiding errors caused by multiple instrument replacements, multiple test item switching and multiple test operations, and improving the accuracy of the test; there is no need for simple instrument stacking, and the turbine generator rotor switching device can reduce the size of the entire project and make it easy to carry; all test operations are realized through program control, and you can arbitrarily select a test item to test on the program interface, or realize automatic testing of the selected item through settings, thereby improving test efficiency.

[0042] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A device for automatically measuring the power supply circuit switching of a hydro-generator rotor, characterized in that: Three low-voltage electrodes (14 / 15 / 16) on one side of the shielding box (6) are respectively connected to three motors (1 / 2 / 3) via three rotating telescopic rods (20); a high-voltage electrode (7) on the other side of the shielding box (6) is connected to the high-voltage rotating telescopic rod (21), and the high-voltage electrode (7) passes through the shielding box (6) and is connected to one of the motors; a rotor test connector is provided on the shielding box (6); the motor drives the three low-voltage electrodes or the high-voltage electrode (7) to conduct the rotor test connector to perform a rotor DC resistance test, a rotor AC impedance test, a rotor AC withstand voltage test and a rotor insulation resistance test.

2. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 1 is characterized in that: The three low-voltage electrodes are respectively a first low-voltage electrode (14), a second low-voltage electrode (15) and a third low-voltage electrode (16); the three motors are respectively a first motor (1), a second motor (2) and a third motor (3); the first low-voltage electrode (14), the second low-voltage electrode (15) and the third low-voltage electrode (16) are respectively connected to the first motor (1), the second motor (2) and the third motor (3) via three low-voltage rotating telescopic rods (20).

3. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 2 is characterized in that: The first motor (1), the second motor (2) and the third motor (3) are fixed to one side of the shielding box (6) by a motor fixing seat (4) and a bracket (5); two low-voltage limit studs (18), two low-voltage guide rods (19) and a low-voltage current conducting column (17) are provided on each of the three low-voltage electrodes.

4. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 2 is characterized in that: The shielding box (6) is provided with a low-voltage connection hole a (61), a low-voltage connection hole b (62), a low-voltage connection hole c (63), a low-voltage connection hole d (64), a low-voltage connection hole e (65), and a low-voltage connection hole f (66) on the side facing the low-voltage electrode; and a high-voltage connection hole g (67) and a high-voltage connection hole h (68) are provided on the other side of the shielding box (6).

5. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 1 is characterized in that: Two high-voltage connecting needle posts (22) are provided at the upper and lower ends of the high-voltage electrode (7).

6. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 1 is characterized in that: The low-voltage rotating telescopic rod (20) and the high-voltage rotating telescopic rod (21) are telescoped toward the shielding box (6).

7. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 1 is characterized in that: The rotor test connector comprises a rotor test connector A (11) and a rotor test connector B (12), and the rotor test connector A (11) and the rotor test connector B (12) are externally connected to a rotor test terminal for testing.

8. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 1 is characterized in that: A shielding box upper cover (8) is provided on the upper side of the shielding box (6) and is connected to a socket bottom plate (9); a socket insulation layer (10) is provided between the socket bottom plate (9) and the rotor test connector A (11) and the rotor test connector B (12); a rotor connector socket core (13) is provided between the rotor test connector A (11) and the rotor test connector B (12); and the rotor connector socket core (13) and the external rotor test terminal form a test circuit.

9. The automatic measurement power supply circuit switching device for a hydro-generator rotor according to claim 3 is characterized in that: The first motor (1) and the second motor (2) push the first low-voltage electrode (14) and the second low-voltage electrode (15) toward the shielding box (6) to perform a rotor DC resistance test; the third motor (3) pushes the third low-voltage electrode (16) to perform a rotor AC impedance test; and the third motor (3) pushes the high-voltage electrode (7) to perform a rotor AC withstand voltage test and a rotor insulation resistance test.

10. The switching method of the automatic measurement power supply circuit switching device of the hydro-generator rotor according to any one of claims 1 to 9, characterized in that: The steps include: S1, when performing a rotor DC resistance test, the first motor (1) and the second motor (2) are controlled by the program to move toward the shielding box (6) so that the low-voltage current conducting posts (17) on the first low-voltage electrode (14) and the second low-voltage electrode (15) are pushed into the low-voltage connection holes a (61), b (62), c (63) and d (64), so that the rotor test connector A (11) and the rotor test connector B (12) are connected to the 200A / 40V low-voltage DC power supply circuit; S2, when performing a rotor AC impedance test, the first motor (1) and the second motor (2) are programmed to contract in opposite directions, so that the first low-voltage electrode (14) and the second low-voltage electrode (15) are disconnected from the low-voltage connection hole a (61), the low-voltage connection hole b (62), the low-voltage connection hole c (63) and the low-voltage connection hole d (64), and then the third motor (3) is programmed to move toward the shielding box (6), so that the low-voltage current conducting column (17) on the third low-voltage electrode (16) is pushed into the low-voltage connection hole e (65) and the low-voltage connection hole f (66), so that the rotor test connector A (11) and the rotor test connector B (12) are connected to the 200V / 1A low-voltage AC power supply circuit; S3, when performing the rotor AC withstand voltage test, the program-controlled third motor (3) contracts in the reverse direction, so that the third low-voltage electrode (16) disconnects the low-voltage connection hole e (65) and the low-voltage connection hole f (66), and the reverse contraction of the third motor (3) continues until the high-voltage connection pin (22) on the high-voltage electrode (7) at the other end of the third motor (3) connects to the high-voltage connection hole g and the high-voltage connection hole h on the other side of the shielding box (6), so that the rotor test connector A (11) and the rotor test connector B (12) are connected to the 2.5 kV / 2A high-voltage AC power supply circuit; S4, when the rotor insulation resistance test is performed, the rotor switching device is in the high-voltage electrode (7) pushed-in state, and the rotor test connector A (11) and the rotor test connector B (12) are connected to the 2.5kV / 6mA high-voltage DC power supply circuit by switching the high-voltage relay.

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