Voltage transformer with switching device

Abstract

The utility model belongs to the field of high-voltage circuit voltage transformers, and particularly relates to a voltage transformer with a switching device. According to the voltage transformer with the switch device, a switch knife handle is arranged on the wall of an oil tank; the switch handle is fixedly arranged on the oil tank wall through the sealing shaft sleeve; a sealing ring for sealing the switch knife handle and the sealing shaft sleeve is arranged on the sealing shaft sleeve; the switch knife handle rotates in the sealing shaft sleeve around the shaft; a fixed contact is arranged on the fixed seat; the switch knife handle rotates 90 degrees in the sealing shaft sleeve, then is contacted with the static contact, and is conducted through a lead. While the sealing of the field dielectric loss test oil tank of the voltage transformer is ensured, the operation is convenient, the mechanism is simple, and the safety of the dielectric loss test is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of high-voltage circuit voltage transformers, and particularly relates to a voltage transformer with a switching device. BACKGROUND

[0002] With the development of power equipment technology, the on-site testing equipment of the transformer is more and more advanced, and is developing towards miniaturization and portability. The transformer testing is not only limited to the laboratory testing conditions, but also needs to be extended to the on-site testing. In order to meet the testing conditions on site, some transformer products must provide terminals for testing. The dielectric loss test is a very important test item, which mainly verifies whether the product is affected by moisture during use and the product quality. In view of this situation, in order to solve the on-site testing of the voltage transformer without affecting the normal operation of the product.

[0003] In order to meet the dielectric loss test conditions, the prior art voltage transformer needs to punch a hole in the middle of the porcelain sleeve of the voltage transformer, and then a test terminal is provided. When testing is needed, the test terminal is used, and the test terminal provided is exposed in the air and needs to withstand voltage with the voltage transformer, and at the same time, sealing is required, which is easy to cause safety hazards. SUMMARY

[0004] In order to solve the problem that the prior art voltage transformer cannot directly use a portable bridge to test the dielectric loss on site, needs to punch a hole in the middle of the porcelain sleeve of the voltage transformer, and then a test terminal is provided, resulting in low measurement efficiency and exposed test terminal, the present application provides a voltage transformer with a switching device, which comprises a voltage transformer body and a switching device provided on the voltage transformer body for dielectric loss testing.

[0005] The voltage transformer body comprises a primary terminal; a sleeve wrapped around the primary terminal; an oil tank arranged at the bottom of the sleeve; the sleeve is connected with the oil tank through an oil tank upper cover plate arranged at the upper part of the oil tank; a junction box is arranged on one side wall of the oil tank; and a switching device is arranged on the other side wall of the oil tank.

[0006] The switching device comprises a switch handle arranged on the oil tank wall of the oil tank, and a sealing shaft sleeve is arranged on the oil tank wall; the switch handle is fixedly arranged on the oil tank wall through the sealing shaft sleeve; a sealing ring is arranged in the sealing shaft sleeve; the switch handle passes through the sealing ring; and the switch handle can rotate in the sealing shaft sleeve around the axis of the sealing shaft sleeve.

[0007] A fixing seat is further arranged on the oil tank wall; one end of the switch handle is provided with a lead wire; one end of the lead wire is connected with the switch handle, and the other end of the lead wire is connected with the fixing seat.

[0008] A stationary contact is arranged on the fixing seat; and the switch handle is in contact with the stationary contact after rotating in the sealing shaft sleeve, so as to be conducted through the lead wire.

[0009] According to the voltage transformer with the switch device, the switch handle body is columnar; a disc-shaped handle is arranged at one end of the switch handle body; the disc-shaped handle is rotated to drive the switch handle body to rotate around the axis; the switch handle body passes through the sealing shaft sleeve and is sealingly connected with the sealing shaft sleeve through the sealing ring arranged on the inner wall of the sealing shaft sleeve; the other end of the switch handle body is provided with a movable contact.

[0010] According to the voltage transformer with the switch device, the movable contact is an L-shaped rod; one end of the movable contact is fixedly connected with one end of the switch handle body, and the other end of the movable contact is rotated under the driving of the switch handle body and then contacts the fixed contact.

[0011] According to the voltage transformer with the switch device, one end of the movable contact is connected with one end of the switch handle body through a screw; one end of the lead wire is wound around one end of the switch handle body connected with the movable contact, and the other end of the lead wire is connected with a fixing seat bolt arranged on the fixing seat.

[0012] According to the voltage transformer with the switch device, the fixed contact is an elastic clamping component with one side open; the L-shaped movable contact is rotated under the driving of the switch handle body and then enters the opening of the fixed contact to contact the fixed contact.

[0013] According to the voltage transformer with the switch device, the fixed contact is provided with an elastic ring-shaped component to make the opening of the fixed contact smaller.

[0014] According to the voltage transformer with the switch device, the switch handle is rotated by 90° in the sealing shaft sleeve and then contacts the fixed contact to be conducted through the lead wire.

[0015] Compared with the prior art, the advantages of the present application are as follows:

[0016] 1. The switch handle is arranged on the oil tank wall; the switch handle is fixedly arranged on the oil tank wall through the sealing shaft sleeve; the sealing ring for sealing the switch handle and the sealing shaft sleeve is arranged on the sealing shaft sleeve, the switch handle is rotated around the axis in the sealing shaft sleeve; the fixed contact is arranged on the fixing seat; the switch handle is rotated by 90° in the sealing shaft sleeve and then contacts the fixed contact to be conducted through the lead wire, which ensures the sealing of the oil tank during the field dielectric loss test of the voltage transformer, is convenient to operate, has a simple mechanism and improves the safety of the dielectric loss test.

[0017] 2. The stationary contact of the present invention is an elastic clamp-shaped component with an opening on one side; an elastic annular component is provided on the stationary contact to make the opening smaller when clamped; after the L-shaped moving contact rotates under the drive of the switch handle body, it enters the opening of the stationary contact and contacts the stationary contact, realizing the rapid conduction between the fixed seat and the switch handle. At the same time, the moving contact will not be accidentally disconnected due to poor contact after contacting the stationary contact, ensuring the safety and reliability of the on-site dielectric loss test process. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the structure of a voltage transformer with a switching device according to the present invention;

[0019] Fig. 2 This is a schematic diagram of the switching device of a voltage transformer with a switching mechanism according to the present invention.

[0020] In the diagram: 1-primary terminal, 2-sleeve, 3-tank top cover, 4-junction box, 5-switch device, 6-tank, 7-switch handle, 8-sealing ring, 9-sealing bushing, 10-stationary contact, 11-fixed base, 12-lead wire, 13-tank, 100-voltage transformer body. Detailed Implementation

[0021] Preferred Implementation Method 1

[0022] like Figs. 1-2 As shown: A voltage transformer with a switching device in this embodiment includes a voltage transformer body 100 and a switching device 5 for dielectric loss testing disposed on the voltage transformer body 100.

[0023] The voltage transformer body 100 includes a primary terminal 1; a bushing 2 wrapped around the primary terminal 1; an oil tank 6 provided at the bottom of the bushing 2; the bushing 2 and the oil tank 6 are connected by an oil tank cover plate 3 provided at the top of the oil tank 6; a junction box 4 is provided on one side wall of the oil tank 6; and a switching device 5 is provided on the other side wall of the oil tank 6.

[0024] The switching device 5 includes a switch handle 7 disposed on the oil tank wall 13 of the oil tank 6, and a sealing sleeve 9 disposed on the oil tank wall 13; the switch handle 7 passes through the sealing sleeve 9 and is fixedly disposed on the oil tank wall 13; a sealing ring 8 is disposed inside the sealing sleeve 9; the switch handle 7 passes through the sealing ring 8; the switch handle 7 can rotate around the axis of the sealing sleeve 9 inside the sealing sleeve 9.

[0025] A fixing seat 11 is also provided on the oil tank wall 13; a lead wire 12 is provided at one end of the switch handle 7; one end of the lead wire 12 is connected to the switch handle 7, and the other end of the lead wire 12 is connected to the fixing seat 11.

[0026] The fixed seat 11 is provided with a static contact 10; the switch handle 7 is in contact with the static contact 10 after rotating in the sealing sleeve 9, thereby conducting through the lead 12.

[0027] The switch handle 7 is columnar in shape; one end of the switch handle 7 is provided with a disc-shaped handle; rotating the disc-shaped handle drives the switch handle 7 to rotate around its axis; the switch handle 7 passes through the sealing sleeve 9 and is sealingly connected with the sealing sleeve 9 through the sealing ring 8 provided on the inner wall of the sealing sleeve 9; the other end of the switch handle 7 is provided with a moving contact.

[0028] The moving contact is an L-shaped rod; one end of the moving contact is fixedly connected with one end of the switch handle 7, and the other end of the moving contact is in contact with the static contact 10 after being driven to rotate by the switch handle 7.

[0029] One end of the moving contact is connected with one end of the switch handle 7 through a screw; one end of the lead 12 is wound around one end of the switch handle 7 connected with the moving contact, and the other end of the lead 12 is connected with the fixed seat bolt provided on the fixed seat 11.

[0030] The static contact 10 is an elastic clamping component with one side open; the L-shaped moving contact is in contact with the static contact 10 after being driven to rotate by the switch handle 7 and entering the opening of the static contact 10.

[0031] The static contact 10 is provided with an elastic ring-shaped component that makes the opening of the static contact 10 smaller.

[0032] The switch handle 7 is in contact with the static contact 10 after rotating 90° in the sealing sleeve 9, thereby conducting through the lead 12.

[0033] The switch device 200 of the embodiment is arranged on the side surface of the oil tank 6 of the voltage transformer body 100; the switch handle 7 is fixed to the oil tank 6 through the sealing sleeve 9, and the working state is switched through the rotation of the switch handle 7;

[0034] The voltage transformer body 100 comprises a primary terminal 1, a bushing 2, an oil tank upper cover plate 3, a terminal box 4, a switch device 5, an oil tank 6; the switch device 5 comprises a switch handle 7, a sealing ring 8, a sealing sleeve 9, a static contact 10, a fixed seat 11, and a lead 12;

[0035] When the voltage transformer body 100 is in normal operation, the moving contact of the switch handle 7 is vertically downward and disconnected with the static contact 10;

[0036] When the voltage transformer body 100 is in power-off test, the switch handle 7 is rotated clockwise by 90 degrees, the moving contact of the switch handle 7 in the oil tank 6 is in contact with the static contact 10, and the test state is realized.

[0037] The application can guarantee the test precision in the field medium loss test state of the voltage transformer, has no influence on the voltage transformer, is not grounded in the normal operation state of the voltage transformer, is grounded only in the medium loss test state of the voltage transformer, meets the field test condition, and is high in efficiency, safe and reliable.

[0038] The detailed description of the application is only the preferred embodiment, and does not limit the scope of the application. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the application, and these modifications or substitutions are included in the scope defined by the claims of the application.

Claims

1. A voltage transformer with a switchgear, characterized by: The voltage transformer body (100) and the switch device (5) for dielectric loss test arranged on the voltage transformer body (100) are included. The voltage transformer body (100) includes a primary terminal (1), a bushing (2) wrapped on the primary terminal (1), an oil tank (6) arranged at the bottom of the bushing (2), and an upper cover plate (3) of the oil tank arranged at the upper part of the oil tank (6) and connecting the bushing (2) and the oil tank (6), a terminal box (4) arranged on one side wall of the oil tank (6), and a switch device (5) arranged on the other side wall of the oil tank (6). The switch device (5) includes a switch handle (7) arranged on the oil tank wall (13) of the oil tank (6), a sealing sleeve (9) arranged on the oil tank wall (13), the switch handle (7) fixedly arranged on the oil tank wall (13) through the sealing sleeve (9), a sealing ring (8) arranged in the sealing sleeve (9), and the switch handle (7) passing through the sealing ring (8) and being rotatable around the axis of the sealing sleeve (9) in the sealing sleeve (9). The oil tank wall (13) is further provided with a fixing seat (11), one end of the switch handle (7) is provided with a lead wire (12), and the other end of the lead wire (12) is connected with the fixing seat (11). The fixing seat (11) is provided with a static contact (10), and the switch handle (7) is in contact with the static contact (10) after being rotated in the sealing sleeve (9) to conduct through the lead wire (12).

2. A voltage transformer with a switching device according to claim 1, characterized in that The switch handle (7) is columnar, one end of the switch handle (7) is provided with a disc-shaped handle, the disc-shaped handle is rotated to drive the switch handle (7) to rotate around the axis, the switch handle (7) passes through the sealing sleeve (9) and is sealingly connected with the sealing sleeve (9) through the sealing ring (8) arranged on the inner wall of the sealing sleeve (9), and the other end of the switch handle (7) is provided with a dynamic contact.

3. A voltage transformer with a switching device according to claim 2, characterized in that The dynamic contact is an L-shaped rod, one end of the dynamic contact is fixedly connected with one end of the switch handle (7), and the other end of the dynamic contact is in contact with the static contact (10) after being rotated under the driving of the switch handle (7).

4. A voltage transformer with a switching device according to claim 3, characterized in that One end of the dynamic contact is connected with one end of the switch handle (7) through a screw, and one end of the lead wire (12) is wound around one end of the switch handle (7) connected with the dynamic contact, and the other end of the lead wire (12) is connected with a fixing bolt arranged on the fixing seat (11).

5. A voltage transformer with a switching device according to claim 4, characterized in that The static contact (10) is an elastic clamping part with one side open, and the L-shaped dynamic contact is in contact with the static contact (10) after being rotated under the driving of the switch handle (7).

6. A voltage transformer with a switching device according to claim 5, characterized in that The static contact (10) is provided with an elastic ring-shaped part for reducing the opening of the static contact (10).

7. A voltage transformer with a switching device according to claim 6, characterized in that The switch handle (7) is in contact with the static contact (10) after being rotated by 90° in the sealing sleeve (9) to conduct through the lead wire (12).

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