Testing transformer grounding device
By designing a test transformer grounding device that contains electric shots, conductive rods and ground columns, the problem of unsafe existing grounding methods is solved, and the effect of simple operation and completely release of voltage is achieved.
Patent Information
- Application Number
- CN202421189231.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The grounding method of the existing test transformer is unsafe, the flexible cable is difficult to control, and it is impossible to determine whether the cable is always in the grounding state, resulting in the failure to completely release the residual voltage.
A grounding device for a test transformer is designed, including a conductive base, a fixed base, a conductive rod, a grounding post, a return spring and a locking pin. By pulling the insulating pull rope to unlock, the conductive rod flips over under the action of the return spring and contacts the conductive base. The grounding column slides downward through the connecting rod to ensure that the voltage is completely released.
The safety and reliability of the grounding operation are achieved, the operation is simple and the voltage is completely released, avoiding the risk of workers being threatened by voltage.
Smart Images
Figure CN222394683U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of transformers, in particular to a grounding device for testing transformers. Background Art
[0002] The test transformer is a high voltage device used in the power industry. It mainly outputs the normal working voltage as a high voltage for calibration tests of electrical equipment.
[0003] After the calibration test of the test transformer is completed and the working power is turned off, in theory, the test transformer should be free of voltage at this time. However, in fact, there will be residual voltage on the grading ring on the top of the test transformer. This residual voltage will be transmitted to the ground through the high-voltage bushing and transformer box below. However, the voltage release through the high-voltage bushing is relatively slow. After the test, if the test transformer needs to be moved or the transformer is manually touched, the residual voltage on the grading ring will pose a threat to the safety of the staff. Therefore, under normal circumstances, the experimenter needs to hold the insulating rod to pick up the cable and manually connect the cable to the ground to release the residual voltage of the test transformer to avoid accidents.
[0004] The existing grounding method has the following shortcomings: first, the cable is a flexible material that is not easy to control, and the workers may come into contact with the cable, posing a threat to their safety; second, in order to ensure the safety of the personnel, when the cable is grounded, the workers generally stay away from the cable, so it is impossible to determine whether the cable is always in a grounded state and whether the grading ring has completely released the residual voltage. Utility Model Content
[0005] The utility model aims to provide a test transformer grounding device which is convenient for personnel to operate and has reliable grounding and complete voltage release.
[0006] The purpose of the utility model is achieved as follows: a test transformer grounding device; the test transformer comprises a transformer box, a high-voltage bushing, and a grading ring; the grounding device comprises a conductive seat, which is arranged at the lower end of the grading ring and is electrically connected to the conductive seat; a fixed seat, which is detachably mounted on the side of the transformer box; the fixed seat comprises two mutually symmetrical docking plates; a limit block is provided at the inner upper end of one of the docking plates, and a sliding seat is provided at the lower end; locking holes are provided on the docking plates; a conductive rod, the lower end of which is hinged on the fixed seat, and the hinge is A connecting plate is provided at the end, and a limiting hole is provided on the connecting plate at a position corresponding to the locking hole; a grounding column, the grounding column can be slidably installed on the sliding seat up and down; a connecting rod, the connecting rod is located inside the fixed seat, one end of which is hinged on the connecting plate, and the other end is hinged on the upper end of the grounding column; a reset spring, the reset spring is located at the upper end of the fixed seat, and it is a tension spring, one end of which is fixed on the fixed seat, and the other end is fixed on the conductive rod; a locking pin, the locking pin can be detachably inserted into the locking hole and the limiting hole, and is used to lock and fix the position of the conductive rod, and an insulating pull rope is provided on the locking pin.
[0007] Compared with the prior art, the beneficial effects of the utility model are: the grounding device provided by the utility model has the advantages of convenient operation by personnel, reliable grounding and thorough voltage release; specifically; on the one hand, grounding can be achieved by pulling out the locking pin by pulling the insulating pull rope at a long distance, and the operation is simpler; on the other hand, after the locking pin is pulled out, the conductive rod flips to a vertical state under the action of the reset spring and is in stable contact with the conductive seat, and at the same time, the grounding column slides downward through the connecting rod and is directly inserted into the ground, so as to be in stable contact with the ground, thereby releasing the voltage more thoroughly.
[0008] As a preferred solution of the utility model, the conductive seat includes a conductive cross bar, a buffer seat slidably mounted on the conductive cross bar and corresponding to the conductive rod, and a buffer spring sleeved on the conductive cross bar; a limit protrusion is provided on the conductive cross bar, one end of the buffer spring abuts against the limit protrusion, and the other end abuts against the buffer seat. This design can reduce the impact of the conductive rod on the conductive seat, thereby extending the service life of the conductive seat and the conductive rod.
[0009] Furthermore, one of the above-mentioned docking plates is provided with a plurality of threaded fixing columns on its inner side, and the other above-mentioned docking plate is provided with a plurality of fixing holes corresponding to the threaded fixing columns; the outer fixing end of the above-mentioned docking plate is provided with a fixing flange, and the above-mentioned fixing flange is also provided with a plurality of fixing holes. This design structure is simple and convenient for assembling and fixing the fixing seat.
[0010] Furthermore, the docking plate is made of insulating material; the conductive seat, conductive rod, connecting rod and grounding column are made of conductive material. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of the utility model.
[0012] Figure 2 It is a schematic diagram of the internal structure of the fixing seat of the utility model.
[0013] Figure 3 It is a schematic diagram of the matching relationship between the conductive seat and the conductive rod of the utility model.
[0014] Among them, 1 transformer box, 2 high-voltage bushing, 3 equalizing ring, 4 conductive seat, 4a conductive cross bar, 4b buffer seat, 4c limit protrusion, 4d buffer spring, 5 fixed seat, 6 docking plate, 6a limit block, 6b locking hole, 6c sliding seat, 7 conductive rod, 7a connecting plate, 7b limit hole, 8 grounding column, 9 connecting rod, 10 reset spring, 11 threaded fixing column, 12 fixed flange. DETAILED DESCRIPTION
[0015] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.
[0016] Combined with Figures 1 to 3 As shown, a test transformer grounding device; the test transformer comprises a transformer box 1, a high-voltage bushing 2, and a grading ring 3; the grounding device comprises a conductive seat 4, which is arranged at the lower end of the grading ring 3 and is electrically connected to the conductive seat 4; a fixed seat 5, which is detachably mounted on the side of the transformer box 1; the fixed seat 5 comprises two mutually symmetrical docking plates 6; a limit block 6a is provided at the inner upper end of one of the docking plates 6, and a sliding seat 6c is provided at the lower end; locking holes 6b are provided on the docking plates 6; a conductive rod 7, the lower end of the conductive rod 7 is hinged on the fixed seat 5, and a connecting plate 7a is provided at its hinged end, and the upper The connecting plate 7a is provided with a limiting hole 7b corresponding to the locking hole 6b; a grounding column 8, which can be slidably installed on the sliding seat 6c; a connecting rod 9, which is located inside the fixing seat 5, one end of which is hinged on the connecting plate 7a, and the other end is hinged on the upper end of the grounding column 8; a reset spring 10, which is located at the upper end of the fixing seat 5, and is a tension spring, one end of which is fixed on the fixing seat 5, and the other end is fixed on the conductive rod 7; a locking pin, which is detachably inserted into the locking hole 6b and the limiting hole 7b, and is used to lock and fix the position of the conductive rod 7, and an insulating pull rope is provided on the locking pin;
[0017] It should be noted that the locking pin and the insulating pull rope are not drawn in the drawings, as long as they can be detachably inserted into the locking hole 6b and the limiting hole 7b to complete the locking and fixing of the conductive rod 7;
[0018] When the grounding state needs to be released, the conductive rod 7 is manually flipped over until the connecting plate 7a at the hinged end of the conductive rod 7 abuts against the limit block 6a. At this time, the limit hole 7b is aligned with the locking hole 6b. The locking pin is inserted into the locking hole 6b and the limit hole 7b to complete the locking and fixing of the conductive rod 7.
[0019] The above-mentioned conductive seat 4 includes a conductive cross bar 4a, a buffer seat 4b slidably mounted on the conductive cross bar 4a and corresponding to the conductive rod 7, and a buffer spring 4d mounted on the conductive cross bar 4a; a limiting protrusion 4c is provided on the above-mentioned conductive cross bar 4a, one end of the above-mentioned buffer spring 4d abuts against the limiting protrusion 4c, and the other end abuts against the buffer seat 4b.
[0020] A plurality of threaded fixing columns 11 are provided on the inner side of one of the above-mentioned docking plates 6, and a plurality of fixing holes corresponding to the positions of the threaded fixing columns 11 are provided on the other above-mentioned docking plate 6; a fixing flange 12 is provided on the outer fixed end of the above-mentioned docking plate 6, and a plurality of fixing holes are also provided on the above-mentioned fixing flange 12;
[0021] It should be noted that the two butt-jointed plates 6 can be assembled by inserting the fixing bolts into the corresponding fixing holes and the threaded fixing columns 11. In addition, the fixing holes are not shown in the drawings, and it is only necessary to know that they are through holes for connection.
[0022] The docking plate 6 is made of insulating material; the conductive seat 4, conductive rod 7, connecting rod 9 and grounding column 8 are made of conductive material.
[0023] When grounding is required, the locking pin is pulled out directly by pulling the insulating rope. As the lock of the conductive rod 7 is released, the conductive rod 7 gradually flips to a vertical state under the action of the reset spring 10 and contacts the buffer seat 4b. At the same time, the grounding column 8 slides downward under the action of the connecting rod 9 and directly inserts into the ground; the residual voltage of the voltage-equalizing ring 3 is completely released through the conductive seat 4, the conductive rod 7, the connecting rod 9, and the grounding column 8 to the ground.
[0024] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.
Claims
1. A test transformer grounding device; the test transformer comprises a transformer box (1), a high-voltage bushing (2), and a grading ring (3); characterized in that: The grounding device comprises A conductive seat (4), the conductive seat (4) being arranged at the lower end of the voltage-equalizing ring (3) and being electrically connected thereto; A fixing seat (5), the fixing seat (5) being detachably mounted on the side of the transformer box (1); the fixing seat (5) comprising two mutually symmetrical butt joint plates (6); a limit block (6a) being provided at the inner upper end of one of the butt joint plates (6), and a sliding seat (6c) being provided at the lower end; and locking holes (6b) being provided on the butt joint plates (6); A conductive rod (7), the lower end of which is hinged on the fixing seat (5), a connecting plate (7a) being provided at the hinged end, and a limiting hole (7b) corresponding to the locking hole (6b) being provided on the connecting plate (7a); A grounding column (8), wherein the grounding column (8) is mounted on the sliding seat (6c) in a manner that allows the grounding column (8) to slide up and down; A connecting rod (9), the connecting rod (9) being located inside the fixing seat (5), one end of which is hinged on the connecting plate (7a), and the other end of which is hinged on the upper end of the grounding column (8); A return spring (10), the return spring (10) being located at the upper end of the fixing seat (5), and being a tension spring, one end of which is fixed on the fixing seat (5), and the other end of which is fixed on the conductive rod (7); A locking pin is detachably inserted into the locking hole (6b) and the limiting hole (7b) and is used to lock and fix the position of the conductive rod (7). An insulating pull rope is provided on the locking pin.
2. A test transformer grounding device according to claim 1, characterized in that: The conductive seat (4) comprises a conductive cross bar (4a), a buffer seat (4b) slidably mounted on the conductive cross bar (4a) and located corresponding to the conductive bar (7), and a buffer spring (4d) sleeved on the conductive cross bar (4a); The conductive cross bar (4a) is provided with a limiting protrusion (4c), one end of the buffer spring (4d) abuts against the limiting protrusion (4c), and the other end abuts against the buffer seat (4b).
3. A test transformer grounding device according to claim 1 or 2, characterized in that: A plurality of threaded fixing columns (11) are provided on the inner side of one of the docking plates (6), and a plurality of fixing holes corresponding to the positions of the threaded fixing columns (11) are provided on the other docking plate (6); The outer fixed end of the docking plate (6) is provided with a fixed flange (12), and the fixed flange (12) is also provided with a plurality of fixing holes.
4. A test transformer grounding device according to claim 1 or 2, characterized in that: The docking plate (6) is made of insulating material; the conductive seat (4), conductive rod (7), connecting rod (9) and grounding column (8) are made of conductive material.