CN221174718U - Gear conversion tool for measuring resistance and voltage ratio of high-voltage winding of dry-type transformer - Google Patents

Abstract

The utility model relates to a gear conversion tool for measuring high-voltage winding resistance and voltage ratio of a dry-type transformer, which comprises a connecting rod and is also provided with a cam pressing mechanism, wherein the lower end of the connecting rod is provided with external threads for external connection, a cam of the cam pressing mechanism is rotationally connected to the upper end of the connecting rod, the rotation axis of the cam is perpendicular to the axis of the connecting rod, a buffer pad and a pressing sheet are sleeved on the connecting rod, the buffer pad is positioned below the cam, the top surface of the buffer pad is provided with a driven matching curved surface matched with the outer edge surface of the cam, the pressing sheet is positioned below the buffer pad, the outer edge surface of the cam is preferably cylindrical, the cylindrical axis corresponding to the cylindrical surface is parallel to the rotation axis of the cam, a certain transverse distance is reserved between the cylindrical axis and the cylindrical axis, and the cam pressing mechanism can be provided with a handle. The utility model can omit the action of fastening by using the wrench in the process of installing and dismantling the copper bar, obviously saves the related operation time and ensures the reliability of connection.

Description

Gear conversion tool for measuring resistance and voltage ratio of high-voltage winding of dry-type transformer

Technical Field

The utility model relates to a portable dry-type transformer high-voltage winding resistance measurement and voltage ratio measurement gear conversion tool.

Background

The measurement of the resistance and the voltage ratio of the transformer winding are listed as routine tests in factory tests, and the winding resistance measurement can be used for checking whether the welding or mechanical connection of the wire connection is good or not, whether the welding or connection is poor or not, whether the resistances of the windings of each phase are balanced or not, and verifying whether the materials and specifications used are correct or not. By voltage ratio measurement, it is possible to check whether the number of turns of the coil is correct, and to determine whether the lead connection is correct. The measurement of the resistance of the winding of the transformer and the measurement of the voltage ratio are both important items in the transformer test, and the voltage ratio is an important performance index of the transformer.

The high-voltage coil of the dry-type transformer adopts a casting process, each tapping line of the coil is welded with an insert and then cast in the coil, the subsequent tapping lines are connected by copper bars, and the copper bars are in fastening contact with the insert (a connecting piece provided with a screw hole for connection) by bolts. When the direct current resistance is measured, the insert and the copper bar are required to be reliably connected, the measurement is accurate, the connecting sheet is required to be removed by a spanner to realize the winding resistance measurement and ensure the data accuracy, the connecting sheet is changed to be a proper gear for tightening by the spanner, for example, 5 gears under the condition of 3 coils, the bolts are required to be removed by the spanner for 27 times and the bolts are required to be tightened by the spanner for 27 times, and the voltage ratio measurement does not need to particularly consider the connection reliability of the insert and the copper bar, but also needs to be repeated for removing the bolts and tightening the bolts. Therefore, in the two-phase test, the bolt and the fastening bolt are removed in a time consuming manner, and in practice, the bolt and the fastening bolt often need to be removed in about 60% of the total time of the two tests, and the winding resistance measurement is also laborious.

Disclosure of utility model

The utility model aims to provide a gear shifting tool convenient to use, which can be used for gear shifting operations of resistance measurement, voltage ratio measurement and the like of a high-voltage winding of a dry-type transformer.

The technical scheme of the utility model is as follows: the utility model provides a dry-type transformer high voltage winding resistance measurement, voltage ratio measurement gear conversion frock, includes the connecting rod, the lower extreme (or call the lower part) of connecting rod is equipped with the external screw thread that is used for external connection, still is equipped with cam hold-down mechanism (the cam mechanism that is used for compressing tightly), cam hold-down mechanism's cam swivelling joint in the upper end (or the upper portion of weighing of connecting rod), cam axis of rotation (the rotatory axis of cam for the connecting rod) perpendicular to axis (the extending direction of connecting rod) of connecting rod, the cover is equipped with blotter and preforming on the connecting rod, the blotter is located the below of cam, its top surface be equipped with the outer fringe face complex driven cooperation curved surface of cam, the preforming is located the below of blotter.

Preferably, the outer edge of the cam is in a cylindrical shape, a cylindrical axis corresponding to the cylindrical shape is parallel to the rotation axis of the cam, and a certain transverse distance is reserved between the cylindrical axis and the rotation axis of the cam.

Preferably, the cam compressing mechanism is provided with a handle, and the lower end (or lower part) of the handle adopts a cam structure, and the cam structure forms a cam of the cam compressing mechanism.

Preferably, the cam structure is rotatably connected with the upper end of the connecting rod through a pin shaft.

Preferably, the lower end (or called the lower part) of the handle adopts an inverted U-shaped structure and is provided with shaft holes penetrating through two sides of the inverted U-shaped structure, the upper end (or called the upper part) of the connecting rod adopts an annular structure and is in a flat plate shape (two side surfaces of the annular structure are planes), and the pin shaft penetrates through the shaft holes at the lower end of the handle and the annular hole at the upper end of the connecting rod to be in rotary connection with one of the handle and the connecting rod and be in rotary connection with the other one or fixed connection with the other one.

Preferably, flange structures which are respectively blocked at the outer sides of the two ends of the shaft hole are arranged at the two ends of the pin shaft.

Preferably, the cushion is integral and made of an elastic material.

Preferably, the cushion is composed of a first cushion and a second cushion, the first cushion is located above the second cushion, and is connected with the second cushion to form an integral structure of the cushion, the driven matching curved surface is arranged on the top surface of the first cushion, and at least one of the first cushion and the second cushion (for example, the second cushion) is made of an elastic material.

Preferably, the top surface of the second cushion pad adopts/is provided with a groove structure, and the bottom of the first cushion pad is embedded on the groove structure of the top surface of the second cushion pad, so that the second cushion pad can also be regarded as an elastic sleeve sleeved at the lower end of the first cushion pad.

Preferably, the lower end (or lower part) of the connecting rod is screwed with a connector, the connector is in a short pipe shape and is provided with an internal thread and an external thread, the screwing with the lower end of the connecting rod is realized through the internal thread of the connector, and the external thread of the connector forms the external thread which is arranged at the lower end of the connecting rod and is used for external connection; or the lower extreme of connecting rod does not connect soon has the connector, set up in the external screw thread that is used for external connection of the lower extreme of connecting rod directly set up in on the body of connecting rod.

The beneficial effects of the utility model are as follows: due to the arrangement of the eccentric cam compressing mechanism, the copper bar compressing mechanism can be used as a rotating handle (or a connecting rod or a connecting head) during installation, the connecting head is screwed into a screw hole of the insert, a spanner is not required to be used for screwing, the handle is compressed (the handle is pulled to the compressing side), and the copper bar can be compressed on the insert by the tabletting, so that reliable connection between the copper bar and the insert is realized; when the screw is detached, the handle is loosened (the handle is pulled to the loosening side), the connector is not subjected to the axial pulling force of the eccentric cam pressing mechanism, and the connector can be screwed out of the screw hole of the insert by rotating the handle (or the connecting rod or the connector) by hands, so that a spanner or other similar tools are not required in the whole operation process, the operation by hands is flexible and convenient, and the operation time is obviously saved; due to the arrangement of the buffer pad, the pressure on the pressing sheet/copper bar is kept through the elastic deformation of the buffer pad, and larger tolerance is allowed to exist on the screwing degree/position of the connector during installation, so that the screwing position of the connector on the insert is not required to be strictly controlled, and in practice, screwing can be stopped only by screwing in place by hands, and therefore, the fact that the connector can be still screwed out by hands after the handle is released is also ensured; since the reliability of the compression force/connection between the copper bar and the insert depends on the self-characteristics of the eccentric cam compression mechanism, the copper bar and the insert can be compressed together as long as the operator pulls the handle to the compression side, substantially eliminating the impact of personal operating factors of the operator (e.g., not screwed to a sufficient degree in the prior art) on the connection reliability.

Drawings

FIG. 1 is a schematic view (front view, perspective) of the construction of the present utility model;

FIG. 2 is a schematic view of the construction of the present utility model (side view, including copper bars);

FIG. 3 is a schematic view (front view) of the construction of the connecting rod according to the present utility model;

FIG. 4 is a schematic view (side view) of the construction of the connecting rod according to the present utility model;

Fig. 5 is a schematic view (front view) of a pin according to the present utility model;

FIG. 6 is a schematic view (front view) of the handle according to the present utility model;

fig. 7 is a schematic view (plan view) of a connection copper bar according to the present utility model.

Detailed Description

Referring to fig. 1-7, the connector for the connection between the inserts is a copper bar 8, with axial notches 88 (see fig. 7) at both ends of the copper bar, the major portion of which is rectangular. Under prior art, when connecting (installing), connect the lower extreme (or called afterbody) of screw rod soon on the screw of corresponding inserts, the upper portion of screw rod exposes from the inserts top, the breach width on the copper bar slightly is greater than the screw rod at the diameter of corresponding part, with the breach card of copper bar on the screw rod, make the screw rod be arranged in the copper bar breach, screw rod upper end has connect gland nut soon, screw gland nut tightly, sticis on the copper bar, and then make copper bar and inserts sticis together, realize the connection of copper bar and inserts.

The cam pressing mechanism is used for replacing the pressing nut, the cam is arranged as the handle 1 for convenient operation, the lower end of the handle adopts a cam structure, the cam structure can be regarded as the cam in the cam (pressing) mechanism, the buffer cushion is positioned below the cam structure and sleeved on the connecting rod 6, the buffer cushion can move up and down under the limiting/guiding action of the connecting rod, the buffer cushion can be regarded as a follower of the cam (pressing) mechanism, and the connecting rod can be regarded as a rack of the cam (pressing) mechanism. When the handle rotates, the buffer pad is pressed downwards through the interaction of the outer edge surface of the cam structure and the top surface of the buffer pad, the pressing sheet is arranged below the buffer pad, when the buffer pad moves downwards, pressure is applied to the copper bar through the pressing sheet 5, the pressing sheet is sleeved on the connecting rod 6, the lower end of the connecting rod is provided with the connector 7, and the upper end of the connecting rod is connected with the cam (disc cam or eccentric cam) structure positioned at the lower part of the handle 1 in a rotating way through the pin shaft 2. The pin shaft is at least rotatably (rotatably) connected with one of the connecting rod and the handle (cam structure), and can be rotatably connected with the other one or fixedly connected with the other one, so that the handle is allowed to rotate relative to the connecting rod by taking the central axis (which can be called as a rotation axis) of the pin shaft as an axis, and the rotation angle range of the handle relative to the connecting rod can be approximately 180 degrees or can be 120 degrees or other suitable angle ranges so as to facilitate operation. The rotation angle range of the handle can be limited by the shape of the top of the buffer pad, a corresponding limit structure can be additionally arranged, and the outer edge surface of the cam structure with a proper shape can be adopted, so that the handle can be in a stable state and has obvious hand feeling when being positioned on the compression side (compression position/angle) or the relaxation side (relaxation position/angle). During installation, the handle can be placed at any position capable of being in a loosening state (for convenient operation, the state when the handle is erected is in the loosening state), the connecting rod is screwed in the screw hole of the insert through the external threads on the connecting head, the notch at the corresponding end of the copper bar is inserted on the connecting rod, the corresponding part (the part exposed outside the insert and adjacent to the insert) of the connecting rod is positioned in the notch of the copper bar, and the corresponding end part of the copper bar is positioned between the insert and the pressing sheet. When the handle swings to one side (can be called a compression side or a compression position, and the corresponding state can be called a compression state), the compression side edge of the cam structure is compressed on the buffer pad, the buffer pad is pressed downwards, and then the copper bar between the compression sheet and the insert is compressed on the insert through the compression sheet; when the handle swings (turns) to the other side (which may be referred to as the relaxed side, or the relaxed position, the corresponding state may be a relaxed state), the relaxed side edge of the cam structure disengages (does not press) against the upper surface of the bumper pad, allowing the bumper pad to resume its original configuration and eliminating pressure on the press plate/copper bar, in which state the connecting rod may be rotated away from the insert. The reliability of contact (contact pressure maintenance) between the copper bar and the insert is derived from the extrusion effect of the cam structure on the buffer pad, so that the pressure on the copper bar is not required to be realized by screwing a nut like the conventional common screw thread (bolt) fastening, the connecting rod is not required to be excessively tightened by screwing on or off the insert, the connecting rod is only required to be rotated by hands, and screwing tools such as a spanner and the like are not required to be used in practice. The size of each part and the screwing degree of the connecting rod on the insert can be properly set, so that the copper bar can be pressed or released (not pressed) when the handle is in a pressed state or a released state.

The connector can be integral with the connecting rod, i.e., an external thread section is provided at the lower end of the connecting rod for screwing with the screw hole of the insert. The connector can also be independent (see fig. 1), is tubular (short tubular), is provided with internal thread and external screw thread, and through internal thread and connecting rod threaded connection (can screw up the connector with instrument such as spanner, avoid the screw thread to become flexible or break away from in the use), the external screw thread 66 that is used for being connected with independent connector that the connecting rod lower extreme set up.

The lower extreme of handle is equipped with the axial breach of reverse U-shaped, or the lower extreme of handle is the U-shaped that falls (the opening is located the U-shaped of lower extreme), and is equipped with the shaft hole that crosses axial breach both sides (U-shaped both sides), correspondingly, the upper end 62 of connecting rod is annular, insert in the axial breach of handle lower extreme, the round pin axle passes the shaft hole of handle lower extreme and the annular hole (annular hole) 64 of connecting rod upper end, both ends are equipped with the flange structure 23 that keeps off respectively in the shaft hole both ends outside of handle lower extreme, can adopt the nut of spin joint at the round pin axle tip or big head screw etc. mode to form required flange structure, in order to restrict/prevent with the handle between lateral sliding. For example, the pin may be in interference fit with the annular hole at the upper end of the connecting rod and in rotational fit (with a small rotational fit clearance) with the shaft hole at the lower end of the handle, so as to avoid unwanted play/translation as much as possible while achieving rotational (or rotational) connection of the handle to the connecting rod.

The range of the peripheral surface (outer circular surface) of the handle contained in the cam structure is set according to actual needs, and at least comprises the area from the compressing side to the releasing side, which is opposite to the top surface of the buffer pad.

The outer edge surface of the cam structure can be cylindrical or any other suitable cylindrical surface shape, when the cylindrical surface shape is adopted, a horizontal distance d is arranged between the corresponding cylindrical axis and the axis of the pin shaft (or the axis of the shaft hole at the lower end of the handle), R1 and R2 in FIG. 6 are the radius of the shaft hole at the lower end of the handle and the radius of the outer edge surface of the cam structure at the lower end of the handle respectively, and O is the axis position of the shaft hole/pin shaft, namely the position of the rotation axis of the cam. Due to this eccentric design, when the handle (top) swings to one side (which may be referred to as the pressing side, left side in fig. 6) to the vicinity of the horizontal position (or other set rotation angle), the corresponding lower edge (which in the corresponding state faces the outer edge surface of the cushion pad, which may be referred to as the pressing side outer edge surface) 12 of the cam structure is farther from the rotation axis, pressing the cushion pad downward; when the handle (top) swings to the other side (which may be referred to as the loosening side, right in fig. 6) to the vicinity of the horizontal position (or other rotation angle set), the corresponding lower edge (which in the corresponding state faces the outer edge surface of the bumper pad, which may be referred to as the loosening side outer edge surface) 11 of the cam structure is closer to the rotation axis, allowing the bumper pad to move upward to relieve the pressure on the press sheet/copper bar. Thus, the change in the height of the lower edge of the cam structure (vertical position relative to the axis of rotation, or height/vertical position relative to the connecting rod) when the handle is on the releasing side and when the handle is on the compacting side, defines the range of height variation of the top surface (upper surface) of the bumper pad allowed when rotating between the releasing side and the compacting side, and the relevant dimensions of the parts are reasonably set so that the bumper pad compacts the copper bar on the insert by the bumper pad when the handle is on the compacting side, and the cam does not apply pressure to the copper bar by the bumper pad and the tabletting when the handle is on the releasing side. According to the same conception, the outer edge surface of the cam structure can also adopt other curved surface shapes, so that the lower edge of the cam structure is far away from the rotation axis when the handle is at the compression side, the buffer pad is pressed downwards, the buffer pad is allowed to move upwards when the handle is at the relaxation side, and the cam does not apply pressure to the copper bars through the buffer pad and the pressing sheet.

The top surface of the bumper pad may be provided/adapted with a cylindrical or similar curved surface in order to achieve a better fit with the lower edge of the cam structure, in particular in a compressed state. Seen from the transverse direction, the curved surface of the top of the buffer pad has a larger span (transverse span), so that the rotation axis O and the transverse midpoint of the lower edge of the cam structure are positioned in the transverse middle of the curved surface of the top of the buffer pad for being attached to the lower edge of the cam. If necessary, the pressing side edge of the cam structure can be slightly recovered (the radial direction is slightly reduced than the adjacent maximum position), so that the cam structure is stable in the pressing state.

The buffer pad (at least one part of the buffer pad) is made of a material with certain elasticity so as to allow the copper bars to be pressed when the screw-in positions of the connecting rods on the inserts are different to a certain extent, and the field operation is convenient. The desired threading position of the connecting rod on the insert may be determined/controlled in any suitable manner, for example, by providing the connecting rod with a transverse line that is aligned with the surface (top surface) of the insert or by aligning the top end of the connector with the surface of the insert in the case of a separate threaded connection of the connector to the connecting rod.

The top surface of blotter is equipped with the curved surface with cam structure complex, and this curved surface should be suited with cam structure's outer fringe face, can keep better laminating and comparatively balanced pressure effect with cam structure's outer fringe face when the handle is in the side that compresses tightly. A cylindrical surface similar to the outer edge surface of the cam structure may be generally employed. The bottom surface of the cushion is generally planar and is capable of conforming to the top surface of the wafer below it.

The number of the buffer pads can be one, or the buffer pads are integrated; the cushion may also be split or, alternatively, a plurality of cushions. For example, the number of the cushions can be two, including a first cushion located above and a second cushion located below, the top surface of the first cushion is provided with a curved surface matched with the cam structure to form the top surface of the cushion (whole), and the bottom surface of the second cushion is a plane capable of being attached to the top surface of the tablet to form the bottom surface of the cushion (whole). The top surface of the second cushion may be channel-shaped (e.g., rectangular channel/cuboid channel), and the lower portion of the first cushion is adapted to the channel of the top surface of the second cushion, and is embedded in the channel of the top surface of the second cushion. The replacement of the first cushion pad and/or the second cushion pad can be performed according to actual needs so as to adapt to the requirements of different occasions or perform maintenance/repair.

The first cushion 3 and the second cushion 4 may be made of the same or different materials according to actual needs.

The tabletting can be rectangular or round flaky/plate-shaped, and has certain hardness/rigidity so as to be beneficial to applying pressure to the copper bars and prolonging the service life.

The cushion pad and the pressing sheet are sleeved on the connecting rod, and a vertical through hole is formed in the connecting rod in a sleeved mode.

The middle part of the connecting rod (the main part between the upper annular ring and the lower external thread/connector) can be equal-diameter/equal-width in the longitudinal direction (the same direction as the annular hole axial direction/the pin axial direction) (see fig. 3), and can be narrow in the transverse direction (the direction perpendicular to the annular hole axial direction/the pin axial direction and perpendicular to the connecting rod axial direction/the extending direction) (see fig. 4). The vertical through holes on the cushion pads and/or shims may be shaped similar to the middle of the connecting rod, and the size of the holes/apertures may be set according to actual needs (e.g., the location of the cushion pads and/or shims on the connecting rod).

The annular upper end of the connecting rod and the rod body (rod-shaped part except the annular upper end) of the connecting rod can be welded into a whole or connected by screw threads.

After the copper bar insert is adopted, the action of fastening by using a spanner in the process of installing and dismantling the copper bar is omitted, the connecting rod can be screwed on the insert screw hole or detached from the insert screw hole only by easily rotating the tool (the handle) by hand, and the reliable connection of the copper bar insert can be realized by pressing the handle. Through the field comparison test, compared with the operation mode of removing/fastening the nut by using a spanner in the prior art, the method can save 80% of relevant operation time and ensure the reliability of connection.

The directions of up, down, left, right, transverse, vertical, longitudinal, horizontal, etc. are used in the present specification only to describe the internal structure of the present utility model or the relative positional relationship of the relevant parts/components, and do not limit the actual use posture, and since the positions/rotation angles of the parts such as the handle are changed during use, the relative positional description is also only a relative positional description in one state (can be regarded as corresponding to the up-down position shown in fig. 1).

The preferred and optional technical means disclosed in the present utility model may be arbitrarily combined to form a plurality of different specific embodiments unless otherwise specified and when one preferred or optional technical means is further defined as another technical means.

Claims (10)

1. The utility model provides a dry-type transformer high voltage winding resistance measurement, voltage ratio measurement gear conversion frock, includes the connecting rod, the lower extreme of connecting rod is equipped with the external screw thread that is used for external connection, its characterized in that still is equipped with cam hold-down mechanism, cam hold-down mechanism's cam swivelling joint in the upper end of connecting rod, cam rotation axis perpendicular to connecting rod's axis, the cover is equipped with blotter and preforming on the connecting rod, the blotter is located the below of cam, its top surface be equipped with the driven cooperation curved surface of the outer fringe face complex of cam, the preforming is located the below of blotter.

2. The gear conversion tool for measuring resistance and voltage ratio of the high-voltage winding of the dry-type transformer according to claim 1, wherein the outer edge of the cam is in a cylindrical shape, and a cylindrical axis corresponding to the cylindrical shape is parallel to the rotation axis of the cam with a certain transverse distance therebetween.

3. The gear shift tool for measuring resistance and voltage ratio of high-voltage winding of dry-type transformer according to claim 1 or 2, wherein the cam compressing mechanism is provided with a handle, the lower end of the handle adopts a cam structure, and the cam structure forms a cam of the cam compressing mechanism.

4. The dry-type transformer high-voltage winding resistance measurement and voltage ratio measurement gear conversion tool according to claim 3, wherein the cam structure is rotatably connected with the upper end of the connecting rod through a pin shaft.

5. The gear shifting tool for measuring resistance and voltage ratio of the high-voltage winding of the dry-type transformer according to claim 4, wherein the lower end of the handle is of an inverted U-shaped structure and is provided with shaft holes penetrating through two sides of the inverted U-shaped structure, the upper end of the connecting rod is of an annular structure and is in a flat plate shape, and the pin shaft penetrates through the shaft holes at the lower end of the handle and the annular hole at the upper end of the connecting rod to be in rotary connection with one of the handle and the connecting rod and to be in rotary connection with the other one or fixed connection with the other one.

6. The fixture for measuring resistance and voltage ratio of high-voltage winding of dry-type transformer according to claim 5, wherein two ends of the pin shaft are provided with flange structures respectively blocking the outer sides of two ends of the shaft hole.

7. The dry-type transformer high-voltage winding resistance measurement and voltage ratio measurement gear conversion tool according to claim 1 or 2, wherein the buffer pad is integrated and made of elastic materials.

8. The gear shift tool for measuring resistance and voltage ratio of high-voltage winding of dry-type transformer according to claim 1 or 2, wherein the buffer pad comprises a first buffer pad and a second buffer pad, the first buffer pad is located above the second buffer pad and is connected with the second buffer pad to form an integral structure of the buffer pad, the driven matching curved surface is arranged on the top surface of the first buffer pad, and at least one of the first buffer pad and the second buffer pad is made of elastic materials.

9. The gear shift tooling for measuring resistance and voltage ratio of the high-voltage winding of the dry-type transformer according to claim 8, wherein the top surface of the second buffer pad is in/provided with a groove structure, and the bottom of the first buffer pad is embedded on the groove structure of the top surface of the second buffer pad.

10. The gear conversion tooling for measuring the resistance and the voltage ratio of the high-voltage winding of the dry-type transformer according to claim 1 or 2 is characterized in that a connector is screwed at the lower end of the connecting rod, the connector is in a short pipe shape and is provided with an internal thread and an external thread, screwing with the lower end of the connecting rod is realized through the internal thread of the connector, and the external thread of the connector forms the external thread which is arranged at the lower end of the connecting rod and is used for external connection; or the lower extreme of connecting rod does not connect soon has the connector, set up in the external screw thread that is used for external connection of the lower extreme of connecting rod directly set up in on the body of connecting rod.