A power grid accessory current transformer production detection device

Abstract

The present application relates to mutual inductor detection technical field, disclose a kind of power grid accessory current transformer production detection device, comprising: detection electrical operation platform, detection electrical operation platform inside is equipped with two ends open type detection room, detection room is provided with automatic detection mechanism, for current transformer is automatically conveyed to different state detection area;Automatic detection mechanism includes multiple connecting sockets equidistantly arranged along the detection room transversely, each connecting socket corresponds to one detection state, connecting socket front end is equipped with the plug-in barrel adapted to the electrical connector of the mutual inductor to be measured, plug-in barrel is provided with self-adapting lead assembly in it;Self-adapting lead assembly includes the flexible interface wall of being arranged in the import end of plug-in barrel;The present application uses self-adapting lead assembly of flexible interface wall and multiple coaxial conductive rings, can compensate the machining error of mutual inductor electrical connector by elastic deformation, realizes multistage contact, ensures the stability and reliability of electrical connection when detecting, effectively reduces the detection error caused by poor contact.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mutual inductor detection, more particularly, it relates to a power grid accessory current transformer production detection device. BACKGROUND

[0002] The current transformer is an important accessory in the power grid, and its production quality directly affects the safety and stability of the power grid operation. In the production process of the current transformer, strict performance detection is required to ensure that its various indicators meet the design requirements. However, the existing current transformer detection method and device have some technical defects.

[0003] When the connection head of the mutual inductor has machining errors or a dirty surface, the traditional rigid connection method cannot effectively compensate for these errors, further increasing the risk of poor contact, thereby affecting the reliability of the detection. Therefore, we propose a power grid accessory current transformer production detection device. SUMMARY

[0004] The present application provides a power grid accessory current transformer production detection device, which solves the technical problem that the rigid connection method in the related art cannot effectively compensate for these errors, affecting the reliability of the detection.

[0005] The present application provides a power grid accessory current transformer production detection device, which includes: a detection electrical operation table, the detection electrical operation table is internally provided with an open-type detection chamber at both ends, an automatic detection mechanism is arranged in the detection chamber, and the automatic detection mechanism is used for automatically conveying the current transformer to different state detection areas;

[0006] The automatic detection mechanism includes a plurality of connection sockets arranged equidistantly transversely along the detection chamber, each connection socket corresponds to a detection state, a plug-in barrel adapted to the connection head of the mutual inductor to be detected is arranged at the front end of the connection socket, and a self-adapting lead assembly is arranged in the plug-in barrel;

[0007] The self-adapting lead assembly includes a flexible wall arranged at the inlet end of the plug-in barrel, the flexible wall is made of an elastic insulating material, an inner wall of the flexible wall is provided with a plurality of coaxially arranged conductive rings, when the connection head of the mutual inductor is inserted, the flexible wall is extruded to change from a plane to a cylindrical wrapping structure, so that the conductive rings and the outer wall of the connection head form multi-stage contact, the machining error is compensated through elastic deformation, the stability of the electrical connection during detection is ensured, and the detection error caused by poor contact is reduced.

[0008] Further, the automatic detection mechanism further includes a driving conveying frame, a mutual inductor clamping seat is fixedly arranged on the driving conveying frame, the mutual inductor clamping seat is composed of two mutually symmetrical bases, a pneumatic push rod is fixedly arranged on the outer side of each of the two bases, a trapezoidal clamping base is fixedly arranged on the telescopic arm of each of the two pneumatic push rods, and the trapezoidal clamping base is used for clamping the mutual inductor.

[0009] Further, the length of the driving conveying frame is larger than that of the detection chamber, and the two ends of the driving conveying frame exceed the entrance and exit of the detection chamber, so as to facilitate the placement of the mutual inductor to be detected and the removal of the mutual inductor after detection.

[0010] Further, the back of each connecting socket is fixedly provided with an electric push rod, the other end of the electric push rod is fixedly connected with the inner wall of the detection chamber, and each electric push rod is controlled by the detection electrical console system to control the horizontal displacement of the connecting socket to the mutual inductor.

[0011] Further, the side of the connecting socket close to the electrical connection head of the mutual inductor is provided with a groove type connecting chamber, the connecting socket and the electrical connection end of the mutual inductor to be detected are matched with each other, a plurality of plug-in barrels are installed in the connecting chamber, the diameter of the plug-in barrel is larger than that of the electrical connection head of the mutual inductor, a plurality of connecting chambers correspond to the electrical connection heads of the mutual inductors one by one, and the positions are aligned with each other.

[0012] Further, the inlet end of the plug-in barrel is further provided with a cleaning ring, the cleaning ring is rotatably connected with the plug-in barrel, the cleaning ring and the flexible wall are parallel to each other, the flexible wall and the cleaning ring are both located at the inlet end of the plug-in barrel, and the distribution from the inlet end to the bottom end is the cleaning ring and the flexible wall.

[0013] Further, the inner wall of the cleaning ring is fixedly provided with a plurality of cleaning silk bundles, the top ends of the plurality of cleaning silk bundles are directed to the center position of the cleaning ring, the outer wall of the cleaning ring is fixedly provided with a stress plate, and the two side walls of the stress plate are respectively fixedly provided with a pull ring belt and a tension belt.

[0014] Further, the tension belt has elasticity, one end of the tension belt away from the stress plate is fixedly connected with the plug-in barrel, the pull ring belt does not have elasticity, and one end of the pull ring belt away from the stress plate is connected with the center of the flexible wall after being wound around the outer wall of the cleaning ring.

[0015] Further, the outer circle of the flexible wall is fixedly provided with a fixed wall ring, the fixed wall ring is fixedly connected with the inner wall of the plug-in barrel, a plurality of conductive rings are protruded from the side of the flexible wall contacting the wiring end of the mutual inductor, the connecting end of the plurality of conductive rings is connected with a wire bundle, and the wire bundle in the plurality of plug-in barrels is connected with the detection system of the detection electrical console.

[0016] Further, the flexible wall is composed of two layers of insulating rubber pads, the outer circles of the two layers of insulating rubber pads are sealed, and the middle layers are divided to form an expansion chamber, the air supply pipe is connected with the air inlet end of the expansion chamber, the air supply end of the air supply pipe is connected with an air pump, and the plurality of plug-in barrels in the same group share one air pump and are controlled by the detection electrical console.

[0017] The beneficial effects of the present application are as follows:

[0018] The adaptive contact assembly composed of the flexible contact wall and the plurality of coaxial conductive rings can compensate the processing error of the current transformer contact head through elastic deformation, realize multi-stage contact, ensure the stability and reliability of the electrical connection during detection, and effectively reduce the detection error caused by poor contact.

[0019] The flexible contact wall can be deformed adaptively according to the current transformer contact head of different shapes, and can be further compensated by air inflation through the air pump, so that the device can be compatible with current transformers of different specifications and shapes, improve the versatility of the equipment, and directly reduce the measurement error caused by connection problems, thereby improving the overall precision of the current transformer detection. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure schematic diagram of the present application;

[0021] Figure 2 is the driving transmission frame structure schematic diagram of the present application;

[0022] Figure 3 is the mutual inductor clamping seat structure schematic diagram of the present application;

[0023] Figure 4 is the connection socket structure schematic diagram of the present application;

[0024] Figure 5 is the connection chamber internal structure schematic diagram of the present application;

[0025] Figure 6 is the plug-in barrel structure schematic diagram of the present application;

[0026] Figure 7 is the clear guide ring and flexible contact wall initial state structure schematic diagram of the present application;

[0027] Figure 8 is the clear guide ring and flexible contact wall under the top state structure schematic diagram of the present application;

[0028] Figure 9 is the conductive ring structure schematic diagram of the present application.

[0029] In the figure: 11, detection electrical operation platform;12, detection chamber;2, automatic detection mechanism;21, driving transmission frame;22, mutual inductor clamping seat;23, pneumatic push rod;24, clamping base;31, electric push rod;32, connection socket;33, wire protection tube;34, air pump;35, air supply pipe;36, connection chamber;37, plug-in barrel;38, clear guide ring;381, clear guide wire;382, force plate;383, tension belt;384, pull ring belt;39, flexible contact wall;391, fixed wall ring;392, conductive ring;301, wire bundle. DETAILED DESCRIPTION

[0030] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that discussions of these implementations are merely provided to enable those skilled in the art to better understand so as to best use the subject matter described herein, and variations of elements, functions, and arrangements of elements can be substituted for those illustrated and described herein without departing from the scope of the present specification. Various examples can omit, substitute, or add various procedures or components as appropriate, and the methods described herein can not necessarily be executed in the order indicated. Further, these descriptions of various examples should not be interpreted as a general approval of such features for all examples, as such features can have been previously disclaimed or should be disclaimed in future examples.

[0031] As shown in the drawings, Figure 1 - Figure 9 A power grid accessory current transformer production detection device, comprising: a detection electrical operation platform 11, the detection electrical operation platform 11 is internally provided with an open type detection chamber 12, and an automatic detection mechanism 2 is arranged in the detection chamber 12, and the automatic detection mechanism 2 is used for automatically conveying the current transformer to different state detection areas;

[0032] The automatic detection mechanism 2 comprises a plurality of connection sockets 32 arranged equidistantly along the detection chamber 12 in the transverse direction, each connection socket 32 corresponds to a detection state, and the front end of the connection socket 32 is provided with a plug-in barrel 37 matched with a current head of the transformer to be detected, and the plug-in barrel 37 is internally provided with a self-adaptive lead assembly;

[0033] The self-adaptive lead assembly comprises a flexible wall 39 arranged at the inlet end of the plug-in barrel 37, the flexible wall 39 is made of elastic insulating material, the inner wall of the flexible wall 39 is provided with a plurality of coaxially arranged conductive rings 392, when the current head of the transformer is inserted, the flexible wall 39 is extruded to change from a plane to a cylindrical wrapping structure, so that the conductive rings 392 and the outer wall of the current head form multi-stage contact, the processing error is compensated through elastic deformation, the stability of electrical connection during detection is ensured, and detection errors caused by poor contact are reduced.

[0034] The automatic detection mechanism 2 further comprises a driving conveying frame 21, the driving conveying frame 21 is fixedly provided with a transformer clamping seat 22, the transformer clamping seat 22 is composed of two mutually symmetrical bases, the outer sides of the two bases are fixedly provided with pneumatic push rods 23, the telescopic arms of the two pneumatic push rods 23 are fixedly provided with trapezoidal clamping bases 24, and the trapezoidal clamping bases 24 are used for clamping the transformer.

[0035] The length dimension of the driving conveying frame 21 is greater than the length dimension of the detection chamber 12, the two ends of the driving conveying frame 21 exceed the inlet and outlet of the detection chamber 12, the transformers to be detected are conveniently placed, and the transformers after detection are conveniently taken out, the detection area is in the detection chamber 12, and the operator operates without contact.

[0036] The back of each connecting socket 32 is fixedly provided with an electric push rod 31, the other end of the electric push rod 31 is fixedly connected with the inner wall of the detection chamber 12, each electric push rod 31 is controlled by the detection electrical operation platform 11 system, and the control connecting socket 32 is horizontally displaced to the direction of the mutual inductor.

[0037] The side of the connecting socket 32 close to the power connection head of the mutual inductor is provided with a groove type connecting chamber 36, the connecting socket 32 is matched with the power connection end of the mutual inductor to be detected, a plurality of plug-in barrels 37 are installed in the connecting chamber 36, the diameter size of the plug-in barrel 37 is greater than the diameter size of the power connection head of the mutual inductor, a plurality of connecting chambers 36 correspond to the power connection head of the mutual inductor one by one, and the positions are aligned with each other.

[0038] The inlet end of the plug-in barrel 37 is further provided with a cleaning ring 38, the cleaning ring 38 is rotationally connected with the plug-in barrel 37, the cleaning ring 38 is parallel to the flexible wall 39, the flexible wall 39 and the cleaning ring 38 are both located at the inlet end of the plug-in barrel 37, and the distribution from the inlet end to the bottom end is the cleaning ring 38, the flexible wall 39.

[0039] The inner wall of the cleaning ring 38 is fixedly provided with a plurality of cleaning filaments 381, the top end of the plurality of cleaning filaments 381 is towards the center position of the cleaning ring 38, the outer wall of the cleaning ring 38 is fixedly provided with a stress plate 382, the two side walls of the stress plate 382 are respectively fixedly provided with a pull ring belt 384 and a tension belt 383.

[0040] The tension belt 383 has elasticity, one end of the tension belt 383 away from the stress plate 382 is fixedly connected with the plug-in barrel 37, the pull ring belt 384 does not have elasticity, one end of the pull ring belt 384 away from the stress plate 382 is connected with the center of the flexible wall 39 after being wound around the outer wall of the cleaning ring 38.

[0041] The outer circle of the flexible wall 39 is fixedly provided with a fixed wall ring 391, the fixed wall ring 391 is fixedly connected with the inner wall of the plug-in barrel 37, a plurality of conductive rings 392 protrude from the side of the flexible wall 39 contacting the mutual inductor wiring end, the connecting end of the plurality of conductive rings 392 is connected with the wire bundle 301, and the plurality of wire bundles 301 in the plurality of plug-in barrels 37 are connected with the detection system of the detection electrical operation platform 11.

[0042] The flexible wall 39 is composed of two layers of insulating rubber pads, the outer circles of the two layers of insulating rubber pads are sealed, and the middle layers are divided to form an expansion chamber, the air supply pipe 35 is connected with the air inlet end of the expansion chamber, the air supply end of the air supply pipe 35 is connected with the air pump 34, the plurality of plug-in barrels 37 in the same group share one air pump 34, and are controlled by the detection electrical operation platform 11.

[0043] In use, the detection electrical operation platform 11 first controls the driving conveying frame 21 to work, and the current transformer clamping seat 22 is translated to the external area of the entrance of the detection chamber 12, and then the current transformer to be detected is placed on the current transformer clamping seat 22, the detection electrical operation platform 11 controls the pneumatic push rod 23 to work, and the two clamping bases 24 simultaneously clamp and fix the current transformer, so that the stability of the current transformer in movement is ensured.

[0044] The current transformer clamping seat 22 fixed with the current transformer is driven by the driving conveying frame 21 to be displaced to the first detection area, until reaching the preset position, so that the connecting end of the current transformer is aligned with the connecting socket 32, and then the first electric push rod 31 is controlled by the detection electrical operation platform 11 to work, the connecting socket 32 is pushed into the wiring end of the current transformer, so that all the wiring heads of the current transformer are inserted into the plug-in cylinder 37, and the outer wall of the connecting chamber 36 and the shell of the connecting end of the current transformer form multiple isolation, so that the influence of the external environment is reduced.

[0045] When the current transformer connecting head is inserted into the plug-in cylinder 37, the connecting head pushes the flexible wall 39, the flexible wall 39 is gradually stretched, the plane structure is changed into a concave structure, and the connecting head is gradually wrapped therein, and the plurality of conductive rings 392 also contact the connecting head to form a conductive structure, and all the wire bundles 301 are routed along the wire protection pipe 33, and the wire protection pipe 33 is fixed on the corresponding connecting socket 32 to protect the wire bundle 301.

[0046] In the process of gradually stretching the flexible wall 39, the flexible wall 39 pulls the pull ring belt 384, the pull ring belt 384 is pulled, the cleaning guide ring 38 is rotated along the preset groove, the cleaning guide ring 38 is rotated to polish and clean the surface of the wiring head of the current transformer, and the flexible wall 39 is pushed and pushed on one side, and the surface of the wiring head is cleaned on the other side, and the impurities cleaned out can be blown out while the flexible wall 39 is deformed, and after detection, the cleaning guide ring 38 is reset by the elastic force of the pull force belt 383.

[0047] The flexible wall 39 is pushed by the wiring head of any shape, and a shape conforming to the wiring head can be formed, even if there is a deviation from the shape of the wiring head, the detection electrical operation platform 11 controls the air pump 34 to work to supply air to the flexible wall 39, so that the flexible wall 39 is expanded in the plug-in cylinder 37, and the gap between the flexible wall 39 and the wiring head after deformation is compensated, so that the connection stability of the conductive ring 392 and the wiring head is ensured.

[0048] Finally, the detection electrical operation platform 11 simulates different power supply conditions and detects, and the detection is sequentially performed from the first detection area to the last detection area.

[0049] There are four power supply environments:

[0050] Normal current signal: The current value that the current transformer needs to handle when the power grid is in normal operation, used to detect the ratio accuracy and linearity of the transformer under rated operating conditions.

[0051] Overload current signal: Input current exceeding the rated value, verify the saturation characteristics and secondary side output stability of the transformer under short-time overload conditions.

[0052] Short-circuit current signal: Apply extreme large current to simulate short-circuit fault, detect the transient response characteristics and anti-saturation ability of the transformer.

[0053] Residual current signal: Inject a small unbalanced current to test the detection sensitivity of the transformer to leakage current, suitable for ground fault protection scenarios.

[0054] Flexible wall 39 and multi-stage conductive ring 392: Elastic deformation achieves full circumferential contact, compensates for the processing error of the contact head, ±0.2mm, contact resistance ≤0.5mΩ.

[0055] Clearing ring 38 + clearing wire 381: Automatically rotates and polishes the surface of the contact head when inserted, removing the oxide layer and avoiding impurities causing poor contact or detection errors.

[0056] Air pump 34 + expansion chamber: Inflates to fill the gap between the flexible wall 39 and the contact head, enhancing the contact force of the conductive ring 392, adapting to irregular shapes, inflating to fill the gap 0.1-0.5mm, adapting to different size tolerances, and maintaining constant contact pressure of the conductive ring 392.

[0057] Connection chamber 36 structure: Forms a sealed environment after insertion, isolating external electromagnetic interference and dust, ensuring the purity of the detection signal.

[0058] Working steps

[0059] Loading and fixing: Drive the transmission frame 21 to move the transformer clamping seat 22 out of the detection chamber 12, and the pneumatic push rod 23 drives the clamping base 24 to clamp the transformer to be tested.

[0060] Shift alignment: Drive the transmission frame 21 to move the transformer clamping seat 22 to the first detection area, and the electric push rod 31 adjusts the horizontal position of the connection socket 32.

[0061] Insertion detection: The electric push rod 31 pushes the connection socket 32 to insert into the contact head, the flexible wall 39 deforms to wrap the conductor, the clearing ring 38 rotates synchronously to clean the contact surface, and the air pump 34 starts to compensate for the gap.

[0062] Multi-state testing: The detection system switches between the four types of electrical signals in sequence, collects data through the wire bundle 301, and calculates whether the ratio difference / angle difference meets the standard.

[0063] The above describes the embodiments of the present application, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative but not restrictive, and the person of ordinary skill in the art can make many forms under the inspiration of the present embodiments, which all belong to the protection of the present embodiments.

Claims

1. A production and testing device for current transformers used in power grid accessories, characterized in that, include: The electrical control panel (11) is equipped with an open-ended detection chamber (12) at both ends. An automatic detection mechanism (2) is installed in the detection chamber (12) to automatically transport the current transformer to different state detection areas. The automatic detection mechanism (2) includes multiple connection sockets (32) arranged equidistantly along the detection chamber (12). Each connection socket (32) corresponds to a detection state. The front end of the connection socket (32) is provided with a plug tube (37) adapted to the connector of the transformer under test. An adaptive conductor component is provided inside the plug tube (37). The adaptive connection assembly includes a flexible wall (39) disposed at the inlet end of the plug tube (37). The flexible wall (39) is made of elastic insulating material and has multiple coaxially arranged conductive rings (392) on its inner wall. When the current transformer connector is inserted, the flexible wall (39) is squeezed and deformed from a planar shape into a cylindrical wrapping structure, so that each conductive ring (392) forms a multi-level contact with the outer wall of the connector. Through elastic deformation to compensate for processing errors, the stability of electrical connection during detection is ensured, and detection errors caused by poor contact are reduced.

2. The power grid accessory current transformer production and testing device according to claim 1, characterized in that, The automatic detection mechanism (2) also includes a drive conveyor frame (21), on which a current transformer clamping seat (22) is fixedly installed. The current transformer clamping seat (22) consists of two mutually symmetrical bases. Pneumatic push rods (23) are fixedly installed on the outer side of the two bases. Trapezoidal clamping bases (24) are fixedly installed on the telescopic arms of the two pneumatic push rods (23) for clamping the current transformer.

3. The power grid accessory current transformer production and testing device according to claim 2, characterized in that, The length of the drive conveyor (21) is greater than that of the test chamber (12). Both ends of the drive conveyor (21) extend beyond the entrance and exit of the test chamber (12), which facilitates the placement of current transformers to be inspected and the removal of current transformers that have been inspected. The test area is inside the test chamber (12), and the staff can operate without contact.

4. The power grid accessory current transformer production and testing device according to claim 1, characterized in that, Each of the connection sockets (32) has an electric push rod (31) fixedly installed on its back. The other end of the electric push rod (31) is fixedly connected to the inner wall of the test chamber (12). Each electric push rod (31) is individually controlled by the test electrical control panel (11) system, which controls the connection socket (32) to move horizontally toward the transformer.

5. The power grid accessory current transformer production and testing device according to claim 1, characterized in that, The connecting socket (32) has a groove-shaped connecting chamber (36) on the side near the current transformer connector. The connecting socket (32) matches the connector of the current transformer to be inspected. Several plug tubes (37) are installed in the connecting chamber (36). The diameter of the plug tubes (37) is larger than the diameter of the current transformer connector. The several connecting chambers (36) correspond one-to-one with the current transformer connector and are aligned with each other.

6. The power grid accessory current transformer production and testing device according to claim 1, characterized in that, The inlet end of the plug tube (37) is also provided with a cleaning guide ring (38), which is rotatably connected to the plug tube (37). The cleaning guide ring (38) is parallel to the flexible wall (39). Both the flexible wall (39) and the cleaning guide ring (38) are located at the inlet end of the plug tube (37), and the distribution from the inlet end to the bottom end is the cleaning guide ring (38) and the flexible wall (39).

7. The power grid accessory current transformer production and testing device according to claim 6, characterized in that, The inner wall of the cleaning guide ring (38) is fixedly provided with a plurality of cleaning guide wires (381), the top ends of the plurality of cleaning guide wires (381) are all facing the center of the cleaning guide ring (38), the outer wall of the cleaning guide ring (38) is fixedly provided with a force plate (382), and the two side walls of the force plate (382) are respectively fixedly provided with a pull ring belt (384) and a tension belt (383).

8. The power grid accessory current transformer production and testing device according to claim 7, characterized in that, The tension band (383) is elastic, and the end of the tension band (383) away from the force plate (382) is fixedly connected to the plug tube (37). The pull ring band (384) is not elastic, and the end of the pull ring band (384) away from the force plate (382) is connected to the center of the flexible wall (39) after wrapping around the outer wall of the guide ring (38).

9. The power grid accessory current transformer production and testing device according to claim 1, characterized in that, The outer ring of the flexible wall (39) is fixedly provided with a wall ring (391), the wall ring (391) is fixedly connected to the inner wall of the plug tube (37), and several conductive rings (392) protrude from one side of the flexible wall (39) that contacts the terminal of the current transformer. The connection ends of several conductive rings (392) are connected to wire bundles (301), and several wire bundles (301) in several plug tubes (37) are connected to the detection system of the detection electrical operating table (11).

10. A production and testing device for current transformers used in power grid accessories according to claim 1, characterized in that, The flexible wall (39) is composed of two layers of insulating rubber pads. The outer ring of the two insulating rubber pads is sealed, and the middle layer forms an expansion chamber. The air inlet end of the expansion chamber is connected to an air supply pipe (35). The air supply end of the air supply pipe (35) is connected to an air pump (34). Several plug tubes (37) in the same group share one air pump (34) and are controlled by the detection electrical operating table (11).

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