AC voltage-withstanding phase sequence conversion device for generator stator

Abstract

The utility model relates to a generator stator AC voltage-withstanding phase sequence conversion device comprising a bottom plate, a plurality of first insulation support members arranged on the bottom plate, a first wiring copper bar arranged on the top of the first insulation support members, three static contacts arranged on the first wiring copper bar, and three second insulation support members arranged on the bottom plate. The top of the second insulating support member is provided with a moving contact, the bottom plate is also provided with a grounding copper bar, and the grounding copper bar is provided with three grounding contacts. When the moving contact is connected with the static contact, a test loop is formed, and when the moving contact is connected with the grounding contact, a grounding loop is formed. The beneficial effects of the utility model are that the problem that the generator stator can only depend on manual discharge and manual commutation by testers in an AC voltage withstand test is effectively solved, the stator phase sequence conversion process is safely and rapidly completed in the AC voltage withstand test process, the electric shock risk of a field test is reduced, and the test efficiency is improved. The device can be applied to the alternating current withstand voltage test process of the three-phase three-core cable with the voltage class of 35kV and below.

Description

Technical Field

[0001] The utility model belongs to the field of electrical tests of high-voltage electrical equipment, and particularly relates to a phase sequence conversion device for AC withstand voltage of a generator stator. Background Art

[0002] The stator winding is the core operating component of a generator, and its insulation performance determines whether the generator can operate normally. The AC withstand voltage test of the stator can effectively evaluate the insulation performance of the stator winding and ensure the safe, stable and reliable operation of the generator. Before the generator is shut down for maintenance, it is necessary to conduct an AC withstand voltage test on the stator winding of the generator to check for possible insulation defects in the stator winding. The AC withstand voltage of the stator needs to be tested separately for the three phases of the stator winding to examine the insulation performance between phases and to the ground. Since the capacitance of the stator in a power station is relatively large, there will be residual charges after the test. Therefore, during the test process, after each phase has completed the withstand voltage test, it is necessary to discharge and change the phase of the stator winding. Since there may be a part of the voltage remaining after each phase of the AC withstand voltage test, there may be a risk of electric shock during the manual phase change process. To improve the safety of the AC withstand voltage test of the stator, standardize the test behavior, and reduce the test safety risk, it is necessary to design a phase sequence conversion device for the AC withstand voltage of a generator stator. Summary of the Invention

[0003] In view of the above problems in the prior art, the utility model provides a phase sequence conversion device for AC withstand voltage of a generator stator. The technical solution is as follows: it includes a bottom plate, several first insulating supports are arranged on the bottom plate, a first wiring copper bar is arranged on the top of the first insulating support, three static contacts are arranged on the first wiring copper bar, three second insulating supports are also arranged on the bottom plate, a moving contact is arranged on the top of the second insulating support, a grounding copper bar is also arranged on the bottom plate, and three grounding contacts are arranged on the grounding copper bar; when the moving contact is connected to the static contact, a test circuit is formed, and when it is connected to the grounding contact, a grounding circuit is formed.

[0004] As a preferred solution, three control motors are arranged on the bottom plate, the control motors are in transmission connection with transmission components, the transmission components are located inside the second insulating support, and the other end of the transmission components is in transmission connection with the moving contact.

[0005] As a preferred solution, the control motors are in wireless signal connection with a control device.

[0006] As a preferred solution, the height of the first insulating support and the second insulating support is not less than 80 cm.

[0007] Advantages of the Utility Model

[0008] This device can be used in the AC withstand voltage test process of the generator stator, effectively solving the problems that the generator stator can only rely on testers to manually discharge and manually change phases during the AC withstand voltage test, safely and quickly completing the stator phase sequence conversion process during the AC withstand voltage test, reducing the electric shock risk of on-site tests, improving test efficiency, and having great practical value. This device has high versatility and can be applied to the AC withstand voltage test process of three-core cables with a voltage level of 35 kV and below. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0010] Figure 2 It is a front view of the present invention.

[0011] Figure 3 It is a top view of the present invention.

[0012] Figure 4 It is a right view of the present invention.

[0013] In the figure: 1. First wiring copper bar; 2. First insulating support; 3. Second insulating support; 4. Static contact; 5. Moving contact; 6. Control motor; 7. Transmission component; 8. Grounding copper bar; 9. Grounding contact; 10. Base plate; 11. Control device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0015] Embodiment 1

[0016] As Figures 1-4 shown, an AC withstand voltage phase sequence conversion device for a generator stator includes a base plate 10. Three first insulating supports 2 are arranged on the base plate 10. A first wiring copper bar 1 is arranged at the top of the first insulating support 2. Three static contacts 4 are arranged on the first wiring copper bar 1. Three second insulating supports 3 are also arranged on the base plate 10. A moving contact 5 is arranged at the top of the second insulating support 3. A grounding copper bar 8 is also arranged on the base plate 10. Three grounding contacts 9 are arranged on the grounding copper bar 8; when the moving contact 5 is connected to the static contact 4, a test circuit is formed, and when it is connected to the grounding contact 9, a grounding circuit is formed.

[0017] Three control motors 6 are arranged on the base plate 10. The control motors 6 are in transmission connection with a transmission component 7. The transmission component 7 is located inside the second insulating support 3, and the other end of the transmission component 7 is in transmission connection with the moving contact 5.

[0018] The control motor 6 is wirelessly connected to the control device 11, and the moving contact 5 is controlled by the control device 11 to connect to the static contact 4 or the grounding contact 5, eliminating the need for manual control and reducing the risk of electric shock.

[0019] The heights of the first insulating support 2 and the second insulating support 3 are 80 cm, and the sufficient insulating height prevents the occurrence of electric breakdown.

[0020] When using the above device, the process is as follows:

[0021] During the test of the generator stator winding, connect the high-voltage wire of the test instrument to the first wiring copper bar of the device, and connect the high-voltage wires led out from the three phases of the stator winding to the wiring terminals of the three-phase moving contacts 5 of the device respectively. Press the "Phase A Test Position" button on the control device 11, and the Phase A moving contact rotates to contact the corresponding static contact 4, forming a Phase A test circuit. Press the "Phase B Grounding Position" and "Phase C Grounding Position" buttons on the remote control, and the Phase B and Phase C moving contacts rotate to contact the corresponding grounding contacts 9 on the grounding copper bar 8, realizing the grounding of Phase B and Phase C. After the above operations are completed, the Phase A test circuit is connected, and Phase B and Phase C are grounded, and the AC withstand voltage test of the stator winding Phase A can be carried out. After the AC withstand voltage test of the stator winding Phase A is completed, press the "Phase A Grounding Position" button on the remote control, and the Phase A moving contact leaves the static contact 4 and rotates to contact the grounding copper bar 8, realizing the discharge and grounding of the stator winding Phase A. Subsequently, press the "Phase B Test Position" button on the remote control, and the Phase B moving contact rotates to contact the corresponding static contact 4, and the Phase B test circuit is connected, and the AC withstand voltage test of the stator winding Phase B can be carried out. The test process of Phase C of the stator winding is the same.

Claims

1. An AC withstand voltage phase sequence conversion device for a generator stator, comprising a bottom plate (10), characterized in that, A plurality of first insulating supports (2) are arranged on the described base plate (10). A first wiring copper bar (1) is arranged at the top of the first insulating support (2). Three static contacts (4) are arranged on the first wiring copper bar (1). Three second insulating supports (3) are also arranged on the base plate (10). A moving contact (5) is arranged at the top of the second insulating support (3). A grounding copper bar (8) is also arranged on the base plate (10). Three grounding contacts (9) are arranged on the grounding copper bar (8). When the moving contact (5) is connected to the static contact (4), a test circuit is formed. When it is connected to the grounding contact (9), a grounding circuit is formed.

2. The AC withstand voltage phase sequence conversion device for a generator stator according to claim 1, wherein Three control motors (6) are arranged on the described base plate (10). The control motor (6) is in transmission connection with a transmission component (7). The transmission component (7) is located inside the second insulating support (3). The other end of the transmission component (7) is in transmission connection with the moving contact (5).

3. The AC withstand voltage phase sequence conversion device for the generator stator according to claim 2, wherein The described control motor (6) is in wireless signal connection with a control device (11).

4. A generator stator AC withstand voltage phase sequence conversion device according to claim 1, characterized in that, The height of the described first insulating support (2) and the second insulating support (3) is not less than 80 cm.

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