Transformer iron core grounding on-line monitoring device

Abstract

The invention belongs to the technical field of transformer core monitoring, and particularly relates to a transformer core grounding on-line monitoring device which comprises a cross-core electrical sensor, the cross-core electrical sensor is of a splicing type, a through hole is formed in the middle of the cross-core electrical sensor after the cross-core electrical sensor is spliced, and a transformer core is inserted into the through hole in a penetrating mode. The cross-core electrical sensor is electrically connected with a data collector, the data collector is electrically connected with a monitoring background host, and a monitoring system is arranged in the monitoring background host; the straight-through electrical sensor is connected with a position adjusting mechanism, the position adjusting mechanism comprises an adjusting cavity, a screw rod, a matching block, a nut and a high-precision adjusting part, the adjusting cavity is installed on the transformer, and a through hole is formed in the bottom of the adjusting cavity. And the installation position of the electrical sensor cannot be quickly and precisely adjusted to the corresponding position, so that magnetic field interference or inaccurate monitoring data is caused.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformer core monitoring, and particularly relates to an online monitoring device for transformer core grounding. BACKGROUND

[0002] The online monitoring of transformer core grounding refers to real-time monitoring of the grounding current of the transformer core and the clamping piece by using high-precision sensors and monitoring equipment to detect and prevent core grounding faults. This monitoring system can timely discover hidden dangers such as multi-point grounding of the core, insulation deterioration or magnetic saturation, thereby preventing overheat and circulating loss and ensuring the safe operation of the transformer. The online monitoring system of transformer core grounding is generally composed of the following parts: a high-precision through-core electrical sensor, a data collector, a monitoring background host and monitoring software. The electrical sensor should be installed at a suitable position of the measured circuit to ensure accurate measurement of the current. Generally, the electrical sensor should be installed close to the power supply or load to avoid measurement errors.

[0003] At present, the adjustment of the position of the sensor, i.e. the need to be installed at a suitable position of the measured circuit and away from the electromagnetic interference source, requires high accuracy of the position adjustment of the sensor, and thus it is relatively troublesome, low in efficiency and low in accuracy, which easily affects the monitoring quality. This phenomenon has become a problem to be solved by the personnel in the field. SUMMARY

[0004] The application aims to provide an online monitoring device for transformer core grounding to solve the problems in the background.

[0005] In order to solve the above technical problems, the application provides the following technical scheme: an online monitoring device for transformer core grounding, comprising a through-core electrical sensor, the through-core electrical sensor is spliced and has a through hole in the middle after splicing, and the transformer core is inserted into the through hole; the through-core electrical sensor is electrically connected with a data collector, the data collector is electrically connected with a monitoring background host, and the monitoring background host is provided with a monitoring system; the through-core electrical sensor is connected with a position adjustment mechanism, the position adjustment mechanism comprises an adjustment cavity, a screw rod, a matching block, a nut and a high-precision adjustment part, the adjustment cavity is installed on the transformer and is provided with a through hole at the bottom, the matching block is fixedly installed on one side of the through-core electrical sensor and is provided with a hole in the middle, the screw rod is inserted into the through hole of the adjustment cavity and the hole of the matching block, the nut is threadedly connected to the screw rod and located at the bottom of the matching block, and the upper end of the screw rod is connected with the high-precision adjustment part.

[0006] The high-precision adjusting part further comprises a top block, a cam, a shaft, a threaded rod, a connecting rod and a conical cylinder; the top block is fixedly installed at the top end of the screw rod and located inside the adjusting cavity; the cam is connected with the inner wall of the adjusting cavity through the shaft; the outer end of the cam is in contact with the lower surface of the top block; the front side of the adjusting cavity is provided with a threaded hole, and the threaded rod is threadedly connected in the threaded hole; the threaded rod is connected with the conical cylinder through the connecting rod; and the edge of the conical cylinder is in contact with the edge of the cam.

[0007] The middle part of the threaded rod is provided with a circular hole, and the connecting rod is slidingly connected in the circular hole; the inner diameters of the front and rear ends of the circular hole are smaller than the inner diameter of the middle part; and the outer side of the connecting rod is fixedly provided with a limiting block.

[0008] The front end of the connecting rod is provided with a scale, and the scale is from one to ten and corresponds to the rotation number of the threaded rod.

[0009] The limiting block and the inner wall of one side of the middle part of the circular hole are fixedly provided with a spring.

[0010] The rear end of the threaded rod is fixedly provided with two arc-shaped blocks; the front side of the conical cylinder is provided with a slot; the inside of the slot is provided with a small hole upward and downward; and a top rod is slidingly connected in the small hole.

[0011] The outer end of the top rod is fixedly provided with a conical sleeve ring, and the inner end is fixedly provided with a circular arc block.

[0012] After the rear end of the conical cylinder is in contact with the rear side of the inner wall of the adjusting cavity, the threaded rod is continuously rotated, and the arc-shaped block is in contact with the circular arc block.

[0013] Compared with the prior art, the present application has the following advantages: by adjusting the position of the through-hole type electrical sensor, the through-hole type electrical sensor is installed at a suitable position of the measured circuit to ensure accurate measurement of the current, the through-hole type electrical sensor is installed near the power supply or load to avoid measurement error, and the distance between the sensors can be controlled to avoid electromagnetic interference affecting the monitoring. By pushing and pulling the connecting rod, it can be quickly adjusted to the corresponding position required by the through-hole type electrical sensor, and then according to the moving distance of the connecting rod, the threaded rod is rotated at a large amplitude, and then after being adjusted to the approximate corresponding position, the threaded rod is slowly rotated for fine adjustment. The efficiency of adjustment is greatly improved, and the accuracy is not affected, and the work efficiency is high. When the high-precision adjustment of the through-type electrical sensor is performed, the through-type electrical sensor is still not adjusted to the accurate position after moving up to the limit position, the threaded rod continues to move to the rear side, the size of the conical cylinder can be directly increased, the taper of the conical cylinder is relatively increased, the adjustment accuracy is guaranteed, and directly increasing the taper of the conical cylinder can cause the distance amplitude of the electrical sensor to be lifted and lowered to be large during high-precision adjustment, so that the adjustment accuracy can be maximally improved, and the adjustment efficiency can be guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the principles of the present application, and do not constitute a limitation of the present application. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the internal structure of the adjustment cavity of the present application; Figure 3 is an exploded view of the shaft rod and the cam of the present application; Figure 4 is a schematic diagram of part of the high-precision adjustment part of the present application; Figure 5 is a schematic diagram of the internal structure of the threaded rod of the present application; Figure 6 is an exploded view of part of the high-precision adjustment part of the present application; Figure 7 is a process schematic diagram of the push-pull connecting rod of the present application; Figure 8 is a schematic diagram of the contact between the arc-shaped block and the circular arc block after the contact; In the drawings: 1, through-type electrical sensor; 2, adjustment cavity; 21, top block; 22, cam; 23, shaft rod; 24, threaded rod; 241, circular hole; 242, arc-shaped block; 25, connecting rod; 251, limiting block; 26, conical cylinder; 261, insertion slot; 262, top rod; 263, conical sleeve ring; 264, circular arc block; 27, spring; 3, screw rod; 4, nut. DETAILED DESCRIPTION

[0015] The technical solutions of the present application will be further described in detail below in combination with preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0016] Please refer to Figures 1-8The application provides a technical scheme: a transformer core grounding online monitoring device, which comprises a through-core electric sensor 1, the through-core electric sensor 1 is spliced, and a through hole is formed in the middle of the through-core electric sensor 1 after splicing, and the transformer core is inserted into the through hole; The through-core electric sensor 1 is electrically connected with a data collector, the data collector is electrically connected with a monitoring background host, and a monitoring system is arranged in the monitoring background host; The through-core electric sensor 1 is connected with a position adjusting mechanism, the position adjusting mechanism comprises an adjusting cavity 2, a screw rod 3, a matching block, a nut 4 and a high-precision adjusting part, the adjusting cavity 2 is installed on the transformer, a through hole is formed in the bottom of the adjusting cavity 2, a hole is formed in the middle of the matching block, the matching block is fixedly installed on one side of the through-core electric sensor 1, the screw rod 3 is inserted into the through hole of the adjusting cavity 2 and the hole of the matching block, the nut 4 is threadedly connected to the screw rod 3 and located at the bottom of the matching block, and the upper end of the screw rod 3 is connected with the high-precision adjusting part; The through-core electric sensor 1 at the position of the grounding wire of the transformer core collects a grounding current signal, the data collector comprehensively analyzes and processes the grounding current signal, the grounding current of the core and the clamping piece is calculated, and the grounding current is uploaded to the background server for monitoring and analysis; when the grounding current exceeds a set alarm value, the monitoring system automatically alarms, and the alarm is stopped after the fault disappears; When the through-core electric sensor 1 is installed, an operator twists the nut 4, the nut 4 moves up and down on the screw rod 3, the nut 4 drives the matching block to move up and down, the matching block drives the through-core electric sensor 1 to move up and down, the position of the through-core electric sensor 1 is adjusted, the through-core electric sensor 1 is installed at a suitable position of the measured circuit, so that the current can be accurately measured, the through-core electric sensor 1 is controlled to be installed close to the power supply or the load, so as to avoid measurement errors, and the distance between the sensors can be controlled, so as to avoid electromagnetic interference affecting the monitoring; The through-core electric sensor 1 is convenient to install and dismount, and is convenient to maintain or replace.

[0017] The high-precision adjusting part comprises a top block 21, a cam 22, a shaft rod 23, a threaded rod 24, a connecting rod 25 and a conical barrel 26; The top block 21 is fixedly installed at the top end of the screw rod 3 and located in the adjusting cavity 2, the cam 22 is connected with the inner wall of the adjusting cavity 2 through the shaft rod 23, the outer end of the cam 22 is in contact with the lower surface of the top block 21, a threaded hole is formed in the front side of the adjusting cavity 2, the threaded rod 24 is threadedly connected into the threaded hole, the threaded rod 24 is connected with the conical barrel 26 through the connecting rod 25, and the edge of the conical barrel 26 is in contact with the edge of the cam 22; After the position of the through electric sensor 1 is roughly adjusted by the nut 4, the operator rotates and moves the threaded rod 24 through the threaded hole, the threaded rod 24 drives the conical cylinder 26 to rotate and move through the connecting rod 25, the edge of the conical cylinder 26 is in contact with the edge of the cam 22 and pushes the cam 22 to rotate through the shaft 23; When the threaded rod 24 is rotated forward, the conical cylinder 26 moves to the rear side, so that the cam 22 lifts the top block 21 through the taper of the conical cylinder 26, so that the through electric sensor 1 is further moved through the screw rod 3; When the threaded rod 24 is rotated reversely, the conical cylinder 26 moves to the front side, so that the top block 21 pushes the cam 22 to rotate reversely and slowly through the taper of the conical cylinder 26; Through the threaded adjustment, the adjustment accuracy is higher, and the distance of the through electric sensor 1 rising or falling is accurately controlled.

[0018] The middle of the threaded rod 24 is provided with a circular hole 241, and the connecting rod 25 is slidingly connected in the circular hole 241, the inner diameters of the front and rear ends of the circular hole 241 are smaller than the inner diameter of the middle part, and the outer side of the connecting rod 25 is fixedly provided with a limiting block 251; The limiting block 251 is slidingly connected to the middle part of the circular hole 241, the front end of the connecting rod 25 extends out of the circular hole 241, and the rear end is fixed with the conical cylinder 26; When the operator twists the threaded rod 24 to adjust the position of the through electric sensor 1 with high accuracy, the connecting rod 25 can be pushed and pulled first, and the conical cylinder 26 is driven to move forward and backward by a large amplitude through the connecting rod 25, so that the amplitude of the up and down movement is large when the through electric sensor 1 is adjusted with high accuracy, so as to estimate the accurate position of the through electric sensor 1 first, and then the distance that the threaded rod 24 needs to move is judged according to the distance that the connecting rod 25 is pushed and pulled; Embodiment one: When the position of the through electric sensor 1 is preliminarily adjusted and needs to be adjusted with high accuracy, if the distance of the through electric sensor 1 moving upward or downward still needs to be large, the connecting rod 25 can be pushed and pulled first to quickly adjust the through electric sensor 1 to the corresponding position, then the threaded rod 24 is rotated by a large amplitude according to the moving distance of the connecting rod 25, and then the threaded rod 24 is slowly rotated for fine adjustment after being adjusted to the approximate corresponding position, so that the efficiency of adjustment is greatly improved, and the accuracy is not affected, and the work efficiency is high.

[0019] The front end of the connecting rod 25 is provided with a scale, and the scale is from one to ten, and corresponds to the number of rotations of the threaded rod 24; Through the above steps, the required moving distance of the threaded rod 24 is determined by the push-pull connecting rod 25, and then the number of turns of the threaded rod 24 is determined according to the maximum scale value displayed by the extended part of the round hole 241 of the connecting rod 25. The operator can quickly rotate the threaded rod 24 to reach the corresponding number of turns, and the adjustment speed is further improved, and the efficiency is higher. The threaded rod 24 can be quickly adjusted for each maintenance or replacement of the through-type electrical sensor 1, and the efficiency is greatly improved.

[0020] The spring 27 is fixed between the limiting block 251 and the inner wall of one side of the middle part of the round hole 241. When the push-pull connecting rod 25 is pushed and pulled, the spring 27 is deformed by the limiting block 251, and then the connecting rod 25 is quickly reset after the connecting rod 25 is loosened. Embodiment two: During the monitoring process, the monitoring data is abnormal, but after maintenance, it is found that it is not a position error problem of the through-type electrical sensor 1. For example, dust is generated in the through hole of the through-type electrical sensor 1, which blocks the through hole, thereby causing the monitoring data to be inaccurate. At this time, the operator only needs to push and pull the connecting rod 25 multiple times, so that the through-type electrical sensor 1 repeatedly moves up and down, thereby dredging the through hole, without the need to power off and clean, and the operation is convenient and efficient.

[0021] The rear end of the threaded rod 24 is fixed with two arc-shaped blocks 242, the front side of the conical cylinder 26 is provided with a slot 261, small holes are arranged on the inside of the slot 261, and a top rod 262 is slidably connected in the small holes.

[0022] The outer end of the top rod 262 is fixed with a conical sleeve ring 263, and the inner end is fixed with a circular arc block 264.

[0023] After the rear end of the conical cylinder 26 contacts the rear side of the inner wall of the adjusting cavity 2, the threaded rod 24 continues to rotate, and the arc-shaped block 242 contacts the circular arc block 264. Embodiment three: When the through-type electrical sensor 1 is adjusted to high precision, the through-type electrical sensor 1 moves upward to the limit position and still cannot be adjusted to the accurate position. At this time, the adjusting nut 4 is adjusted again, and the through-type electrical sensor 1 is adjusted to high precision for the second time. The operation is relatively complicated. Embodiment four: When the high-precision adjustment of the through electric sensor 1 is performed, the through electric sensor 1 is still not adjusted to the accurate position after being moved upward to the limit position, the threaded rod 24 is continuously rotated, the threaded rod 24 is continuously moved to the rear side, at this time, the arc block 242 is inserted into the insertion slot 261 and in contact with the circular arc block 264, the circular arc block 264 is pushed, the circular arc block 264 drives the conical sleeve ring 263 to expand outward through the top rod 262, so that the outer diameter of the conical barrel 26 is increased, the through electric sensor 1 can be continuously lifted, and secondary high-precision adjustment is not required, the operation is relatively simple, and the size of the conical barrel 26 can be directly increased, the taper of the conical barrel 26 is relatively increased, the adjustment accuracy is guaranteed, and directly increasing the taper of the conical barrel 26 can cause the distance amplitude of the through electric sensor 1 to be lifted and lowered to be large during high-precision adjustment, so that the outer diameter of the conical barrel 26 is increased on the original outer diameter, the adjustment accuracy can be maximally improved, and the adjustment efficiency can be guaranteed.

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An on-line monitoring device for transformer core grounding, comprising a through-core electrical sensor (1), characterized in that: The through core electric sensor (1) is spliced, and the middle part is a through hole after splicing, and the transformer core is inserted into the through hole; The through core electric sensor (1) is electrically connected with a data collector, the data collector is electrically connected with a monitoring background host, and the monitoring background host is provided with a monitoring system. The through core electric sensor (1) is connected with a position adjusting mechanism, the position adjusting mechanism comprises an adjusting cavity (2), a screw rod (3), a matching block, a nut (4) and a high-precision adjusting part, the adjusting cavity (2) is installed on the transformer, and a through hole is arranged at the bottom, a hole is arranged in the middle of the matching block, and the matching block is fixedly installed on one side of the through core electric sensor (1), the screw rod (3) is inserted into the through hole of the adjusting cavity (2) and the hole of the matching block, the nut (4) is threadedly connected on the screw rod (3) and located at the bottom of the matching block, and the upper end of the screw rod (3) is connected with the high-precision adjusting part.

2. The transformer core grounding on-line monitoring device according to claim 1, characterized in that: The high-precision adjusting part comprises a top block (21), a cam (22), a shaft rod (23), a threaded rod (24), a connecting rod (25) and a conical barrel (26); The top block (21) is fixedly installed at the top end of the screw rod (3) and located in the adjusting cavity (2), the cam (22) is connected with the inner wall of the adjusting cavity (2) through the shaft rod (23), the outer end of the cam (22) is in contact with the lower surface of the top block (21), a threaded hole is arranged on the front side of the adjusting cavity (2), the threaded rod (24) is threadedly connected in the threaded hole, the threaded rod (24) is connected with the conical barrel (26) through the connecting rod (25), and the edge of the conical barrel (26) is in contact with the edge of the cam (22).

3. The transformer core grounding on-line monitoring device according to claim 2, characterized in that: The middle part of the threaded rod (24) is provided with a circular hole (241), and the connecting rod (25) is slidingly connected in the circular hole (241), the inner diameters of the front end and the rear end of the circular hole (241) are smaller than the inner diameter of the middle part, and the outer side of the connecting rod (25) is fixedly provided with a limiting block (251); The limiting block (251) is slidingly connected to the middle part of the circular hole (241), the front end of the connecting rod (25) protrudes out of the circular hole (241), and the rear end is fixedly connected with the conical barrel (26).

4. The transformer core grounding on-line monitoring device according to claim 3, characterized in that: The front end of the connecting rod (25) is provided with a scale, and the scale is from one to ten, and corresponds to the rotation number of the threaded rod (24).

5. The transformer core grounding on-line monitoring device according to claim 4, characterized in that: The limiting block (251) and the inner wall on one side of the middle part of the circular hole (241) are fixedly provided with a spring (27).

6. The transformer core grounding on-line monitoring device according to claim 5, characterized in that: The rear end of the threaded rod (24) is fixedly provided with two arc-shaped blocks (242), the front side of the conical barrel (26) is provided with a slot (261), small holes are arranged on the inside of the slot (261) and the top and bottom, and a jack (262) is slidingly connected in the small holes.

7. The transformer core grounding on-line monitoring device according to claim 6, characterized in that: The outer end of the jack (262) is fixedly provided with a conical sleeve ring (263), and the inner end is fixedly provided with a circular arc block (264).

8. The transformer core grounding on-line monitoring device according to claim 7, characterized in that: After the rear end of the conical barrel (26) is in contact with the rear side of the inner wall of the adjusting cavity (2), the threaded rod (24) continues to rotate, and the arc-shaped block (242) is in contact with the circular arc block (264).

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