CN117268248A - Method and device for measuring magnetic characteristics of magnetic core of transformer - Google Patents
Method and device for measuring magnetic characteristics of magnetic core of transformer Download PDFInfo
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- CN117268248A CN117268248A CN202311548612.XA CN202311548612A CN117268248A CN 117268248 A CN117268248 A CN 117268248A CN 202311548612 A CN202311548612 A CN 202311548612A CN 117268248 A CN117268248 A CN 117268248A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003825 pressing Methods 0.000 claims description 46
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- 230000007423 decrease Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 7
- 241000282472 Canis lupus familiaris Species 0.000 description 5
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- 238000013459 approach Methods 0.000 description 3
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- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The invention discloses a method and a device for measuring magnetic characteristics of a magnetic core of a transformer, which belong to the technical field of magnetic measurement and comprise a base and two movable seats, wherein the two movable seats are arranged side by side, two stop blocks are arranged on the movable seats, one ends of the stop blocks are arranged in a sliding manner with the movable seats.
Description
Technical Field
The invention discloses a method and a device for measuring magnetic characteristics of a magnetic core of a transformer, and belongs to the technical field of magnetic measurement.
Background
A transformer is a device for changing an ac voltage using the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil, and a magnetic core (iron core). The main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformers), and the like. As one of the core components of a transformer, in the application of magnetic elements, an air gap is usually added, mainly considering the following factors: firstly, if no air gap is added, the inductance value and the magnetic permeability will show a linear function relationship, the magnitude of the inductance value is easily influenced by external conditions such as temperature and winding current, and the stability of the inductance value of the inductance element is difficult to realize; secondly, the saturation degree of the magnetic core can be reduced by increasing the air gap, so that the magnetic core can be saturated under the condition that the coil passes a relatively large current; finally, to both reduce the core volume and store more energy, increasing the air gap is a useful and easy to implement method. However, adding the air gap adds extra loss to the magnetic core, and the increase of the loss not only reduces the working efficiency of the electrical equipment, but also causes the heat generated by the electrical equipment to affect the normal operation of the equipment and even cause the equipment to be damaged, so how to determine the length of the air gap in the magnetic core becomes one of important measurement parameters.
The patent with the publication number of CN111198343B discloses an iron core magnetic property measuring device which comprises a device base, a receiving rod, a coil sleeve, a precise displacement table base, a boss, a heat-insulating shell and an iron core fixing device; at least two bearing rods are fixed in the device base; the boss is fixed in the middle of the device base, and the top of the boss is provided with a sliding rail; the coil sleeve is placed in the sliding rail of the boss; the precise displacement table base is slidably arranged on the bearing rod; the two precise displacement platform bases are positioned on two sides of the boss; the precise displacement tables are provided with spiral micrometer meters and are slidably arranged on the bases of the respective precise displacement tables; the heat-insulating shell is fixed on the device base; the two iron core fixing devices are fixed on the respective precise displacement tables and are positioned inside the heat-insulating shell.
Although the air gap length between the iron cores can be accurately controlled through the precise displacement table under the condition of ensuring the fixation of the iron cores, the air gap length adjustment error of 0.01 mm can be achieved, the iron cores are E-shaped, when the air gap length is adjusted and measured, the three magnetic columns of the two iron cores move synchronously, air gaps are reserved between the three magnetic columns of the two iron cores, the working efficiency of the electrical equipment can be reduced due to large magnetic leakage, the conventional method is to grind a part of the middle magnetic column of the iron cores to form the air gap, the conventional test equipment cannot independently measure the air gap length arranged in the middle of the iron cores, meanwhile, the measured data are calculated to obtain the air gap length, the whole measurement process is complicated, and meanwhile, according to the test result obtained by the method of the patent, the air gap length is inaccurate due to the fact that the three air gaps can affect the result, and the test result is not provided with large reference value.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method and a device for measuring the magnetic characteristics of a magnetic core of a transformer.
The invention realizes the aim through the following technical scheme, and the method for measuring the magnetic characteristics of the magnetic core of the transformer comprises the following steps:
s1: firstly, grinding a part of magnetic columns on two sides of two E-shaped magnetic cores according to the inclined plane angles of wedge-shaped magnetic blocks, respectively fixing the two magnetic columns on two movable seats, and fixing and aligning the two magnetic cores by virtue of a pressing plate and a stop block;
s2: the coil cylinder is fixed on the mounting seat, then the third screw rod is rotated, so that the middle magnetic columns of the two magnetic cores enter the coil cylinder and are in contact with each other, a gap is reserved between the magnetic columns at the two sides of the magnetic cores, then the second screw rod is rotated, so that the wedge-shaped magnetic block is in contact with the magnetic columns at the two sides of the two magnetic cores by means of inclined planes, the magnetic conduction state is maintained, the end faces of the wedge-shaped magnetic block are level with the side faces of the magnetic columns at the two sides of the magnetic cores, and meanwhile, in the state, no air gap exists between the middle magnetic columns of the two magnetic cores;
s3: the probe of the dial indicator is propped against the pressing plate by rotating the second adjusting bolt, the reading of the dial indicator is zeroed, and then the lead on the coil tube is connected to the inductance measuring instrument and a preset value of current is introduced;
s4: each time, the second screw is rotated for a designated number of turns, so that the two wedge-shaped magnetic blocks move by the same distance in the direction of approaching each other, the wedge-shaped magnetic blocks push the two magnetic cores to move by the same distance in the direction of separating from each other by virtue of the inclined planes, an air gap is formed between the middle magnetic columns of the two magnetic cores, and meanwhile, the dial indicator can record the moving distance of the magnetic cores;
s5: under the condition that the two magnetic cores have different air gap lengths, the inductance value of the conducting wire wound on the outer side of the coil tube is measured by using the inductance measuring instrument, the inductance gradually decreases along with the increase of the air gap length, and when the variation of the inductance is equal to 0, the optimal air gap length of the magnetic cores can be measured.
The utility model provides a transformer magnetic core magnetic property measuring device, includes base and movable seat, the movable seat is provided with two, and two movable seats are according to setting side by side, be provided with two dogs on the movable seat, the one end and the movable seat slip of dog set up, and the other end is higher than the surface of movable seat, be provided with the first regulating part that two dogs of drive kept away from each other or are close to each other on the movable seat, and the movable seat still is provided with and is used for exerting pressure so that the magnetic core supports the compact heap of dog side, two be provided with the mount pad between the movable seat, be provided with a coil section of thick bamboo on the mount pad, and be provided with the clamping piece that is used for the fixed coil section of thick bamboo on the mount pad, be provided with the carriage on the carriage, install wedge magnet piece on the carriage, the both sides of wedge magnet piece have with two magnetic core complex inclined plane, be provided with on the mount pad and be used for driving two carriages and keep away from each other or each other be provided with the third regulating part on the movable seat, install the clamp meter on the magnetic core and support, the dial gauge, the probe and the wire are provided with the gauge.
Preferably, the movable seat is provided with a first chute, the lower end of the stop block is slidably arranged in the first chute, the first adjusting piece comprises a first screw rod, two ends of the first screw rod are rotationally connected with the movable seat, the first screw rod is provided with threads with opposite rotation directions at two ends, and the two stop blocks are in threaded connection with the first screw rod.
Preferably, the pre-pressing piece comprises a pressing block, a first limit bolt, a first spring and a nut, wherein the first limit bolt and the first spring are both provided with two, the first limit bolt passes through the pressing block and then is in threaded connection with the pressing block, the nut on the same first limit bolt is provided with two nuts, the nuts are arranged on the side face of the first limit bolt, the first spring is sleeved on the outer side of the first limit bolt, the two ends of the first spring are respectively abutted against the stopping block and the nuts, and the first spring applies elasticity to the nuts so that the pressing block is abutted against the side face of the magnetic core.
Preferably, the second adjusting piece comprises a second screw rod, two sections of threads with opposite screwing directions are arranged on the second screw rod, a second sliding groove is formed in the mounting seat, the sliding frame is of a T-shaped structure, a protruding block which is arranged at the lower end of the sliding frame in a sliding mode with the second sliding groove is arranged at the lower end of the sliding frame, and the protruding block is in threaded connection with the second screw rod.
Preferably, the locating piece used for adjusting the relative distance between the wedge-shaped magnetic block and the sliding frame is arranged on the sliding frame, the locating piece comprises a first adjusting bolt, a second limiting bolt and a second spring, the second limiting bolt and the second spring are both arranged in two, one end of the second limiting bolt penetrates through the sliding frame and then is fixedly connected with the wedge-shaped magnetic block, the second spring is sleeved on the second limiting bolt, two ends of the second spring are respectively abutted to the second limiting bolt and the sliding frame, the first adjusting bolt is in threaded connection with the sliding frame, and one end of the first adjusting bolt is abutted to the wedge-shaped magnetic block after penetrating through the sliding frame.
Preferably, the compressing element comprises a fixed block, a third limit bolt, a third spring and a pressing plate, wherein the fixed block, the third limit bolt and the third spring are all arranged in two, the fixed block is fixedly arranged on the movable seat, one end of the third limit bolt penetrates through the fixed block and then is in threaded connection with the pressing plate, the third spring is sleeved on the third limit bolt, two ends of the third spring are respectively in interference with the fixed block and the pressing plate, and a convex column which is in interference with a probe of the dial indicator is arranged on the pressing plate.
Preferably, the third regulating part comprises a fixed seat, a sliding block, a first guide rod, a fourth spring and a second regulating bolt, lugs are arranged on the dial indicator, notches are arranged on the fixed seat, the first guide rod and the fourth spring are both provided with two, two ends of the first guide rod are connected with the fixed seat, the sliding block is slidably arranged with the two first guide rods, a groove for installing the lugs is arranged on the sliding block, the fourth spring is sleeved on the first guide rod, two ends of the fourth spring are respectively abutted against the fixed seat and the sliding block, the second regulating bolt is in threaded connection with the fixed seat, and an inserting rod matched with the locating lug is arranged on the second regulating bolt.
Preferably, the clamping piece comprises a driving rod, a first sliding rod, a second sliding rod and a cover plate, two openings matched with the coil cylinder are formed in the mounting seat, a third sliding groove for the first sliding rod, the second sliding rod and the driving rod to slide is formed in the mounting seat, the directions of the first sliding rod and the second sliding rod are parallel, the directions of the first sliding rod and the second sliding rod are perpendicular to the sliding direction of the driving rod, a wedge-shaped boss matched with the driving rod in a sliding mode is arranged at one end, away from each other, of the first sliding rod and the second sliding rod, a fifth spring is further arranged at one end of the first sliding rod and one end of the second sliding rod, the end portion of the fifth spring is used for keeping the first sliding rod and the end portion of the second sliding rod to extend into the openings and clamp the coil cylinder, the driving rod is of an L-shaped structure, a sixth spring is arranged at one end of the driving rod, and the cover plate is fixedly connected with the mounting seat through bolts.
Preferably, the fourth regulating part comprises a third screw rod, a second guide rod and a fixed plate, wherein the fixed plate and the second guide rod are both provided with two, the fixed plate is fixed on the base, the two second guide rods and the third screw rod are both rotationally connected with the two fixed plates, two sections of threads with opposite rotation directions are arranged on the third screw rod, the two movable seats are slidably arranged with the second guide rod, and the two movable seats are in threaded connection with the third screw rod.
Compared with the prior art, the invention has the beneficial effects that:
utilize compressing tightly piece and dog to fix two magnetic cores on two movable seats, make two magnetic cores conflict through the fourth regulating part, the magnetic column of magnetic core both sides contradicts with the inclined plane of wedge magnetic path, the magnetic column at two magnetic core middle parts is contradicted each other, through the wire circular telegram on the coil cylinder, then utilize the relative position of second regulating part regulation carriage and wedge magnetic path, it is air gap to exist between the magnetic column at magnetic core middle part, and the air gap length slowly becomes big, utilize inductance measuring apparatu to measure the inductance value size of wire on the coil cylinder simultaneously, obtain best air gap length according to the variation situation of inductance value, need not to carry out complicated calculation to measured data, the measurement process is simple and convenient, the practicality is strong.
Drawings
FIG. 1 is a schematic diagram of a conventional interference structure with two normal cores without air gaps;
FIG. 2 is a schematic diagram of a magnetic characteristic measuring apparatus for a transformer core according to the present invention;
FIG. 3 is a schematic view of the structure of the pre-pressing member, the pressing member and the movable seat according to the present invention;
FIG. 4 is an exploded view of a third adjustment member of the present invention;
FIG. 5 is a schematic view of the structure of the wedge magnet, carriage and positioning member of the present invention;
FIG. 6 is a schematic diagram of a second screw, carriage and wedge magnet of the present invention;
FIG. 7 is a schematic view of the structure of the mounting base and clamping member of the present invention;
fig. 8 is a flowchart of a method for measuring magnetic characteristics of a transformer core according to the present invention.
Reference numerals: 1. a magnetic core; 2. a dial indicator; 3. a pressing member; 4. a convex column; 5. wedge-shaped magnetic blocks; 6. a coil tube; 7. a stop block; 8. a fixing plate; 9. a movable seat; 10. a base; 11. an inductance measuring instrument; 12. a second adjusting member; 13. a mounting base; 14. a first adjustment member; 15. a third spring; 16. a fixed block; 17. the third limit bolt; 18. a third screw; 19. a second guide bar; 20. a first screw; 21. a nut; 22. a first spring; 23. a first limit bolt; 24. wedge-shaped boss; 25. a lug; 26. a fourth spring; 27. a sliding block; 28. a first guide bar; 29. a second adjusting bolt; 30. a rod; 31. a fixing seat; 32. a positioning piece; 33. an inclined plane; 34. a clamping member; 35. a second spring; 36. the second limit bolt; 37. a first adjusting bolt; 38. a carriage; 39. a bump; 40. a second screw; 41. a driving rod; 42. a first slide bar; 43. a cover plate; 44. a sixth spring; 45. a second slide bar; 46. a notch; 47. a fifth spring; 48. a pressing plate; 49. and (5) briquetting.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 8, a method for measuring magnetic characteristics of a transformer core includes the steps of:
s1: firstly, grinding a part of the magnetic columns on two sides of the two E-shaped magnetic cores 1 according to the angle of the inclined plane 33 of the wedge-shaped magnetic block 5, respectively fixing the two magnetic columns on the two movable seats 9, and fixing and aligning the two magnetic cores 1 by virtue of the pressing plate 48 and the stop block 7;
s2: the coil cylinder 6 is fixed on the mounting seat 13, then the third screw rod 18 is rotated to enable the middle magnetic columns of the two magnetic cores 1 to enter the coil cylinder 6 and collide, a gap is reserved between the magnetic columns on two sides of the magnetic cores 1, then the second screw rod 40 is rotated to enable the wedge-shaped magnetic block 5 to collide with the magnetic columns on two sides of the two magnetic cores 1 by means of the inclined planes 33 and keep a magnetic conduction state, the end faces of the wedge-shaped magnetic block 5 are level with the side faces of the magnetic columns on two sides of the magnetic cores 1, and meanwhile in the state, no air gap exists between the middle magnetic columns of the two magnetic cores 1;
s3: the probe of the dial indicator 2 is pressed against the pressing plate 48 by rotating the second adjusting bolt 29, the reading of the dial indicator 2 is zeroed, and then the lead wire on the coil tube 6 is connected to the inductance measuring instrument 11, and a current with a preset value is introduced;
s4: each time the second screw 40 is rotated for a designated number of turns to enable the two wedge-shaped magnetic blocks 5 to move by the same distance in the direction of approaching each other, the wedge-shaped magnetic blocks 5 push the two magnetic cores 1 to move by the same distance in the direction of separating from each other by means of the inclined planes 33, an air gap is formed between the middle magnetic columns of the two magnetic cores 1, and meanwhile, the dial indicator 2 can record the distance of moving the magnetic cores 1;
s5: in the case that the two magnetic cores 1 have different air gap lengths, the inductance value of the wire wound on the outer side of the coil tube 6 is measured by the inductance measuring instrument 11, the inductance gradually decreases as the air gap length increases, and when the variation of the inductance is equal to 0, the optimal air gap length of the magnetic core 1 can be measured.
As shown in fig. 1-7, a magnetic characteristic measuring device for a magnetic core of a transformer comprises a base 10 and a movable seat 9, wherein two movable seats 9 are arranged side by side, two stop blocks 7 are arranged on the movable seats 9, one ends of the stop blocks 7 are slidably arranged with the movable seats 9, the other ends of the stop blocks are higher than the surface of the movable seats 9, a first adjusting piece 14 for driving the two stop blocks 7 to be mutually far away or mutually close is arranged on the movable seats 9, the movable seats 9 are further provided with a pressing piece 3 for applying pressure to the magnetic core 1 so that the magnetic core 1 abuts against the side surface of the stop block 7, a mounting seat 13 is arranged between the two movable seats 9, a coil cylinder 6 is arranged on the mounting seat 13, clamping pieces 34 for fixing the coil cylinder 6 are arranged on the mounting seat 13, sliding frames 38 are arranged on the two sides of the wedge-shaped magnetic blocks 5, inclined surfaces 33 matched with the two magnetic cores 1 are arranged on the two sides of the sliding frames 38, a second adjusting piece 12 for driving the two sliding frames 38 to be mutually close or mutually far away from each other is arranged on the mounting seat 13, a wire guide wire is arranged on the third adjusting piece 9, a plurality of electric guide wire is in contact with the base 11, and a measuring instrument is arranged on the base 11 and is electrically connected with the first adjusting piece 2.
As shown in fig. 2 and 3, a first chute is formed in the movable seat 9, the lower end of the stop block 7 is slidably disposed in the first chute, the first adjusting member 14 includes a first screw rod 20, two ends of the first screw rod 20 are rotatably connected with the movable seat 9, the first screw rod 20 is provided with threads with opposite rotation directions at two ends, the two stop blocks 7 are in threaded connection with the first screw rod 20, and the two stop blocks 7 slide in the first chute by rotating the first screw rod 20 and can clamp and position two sides of the magnetic core 1 with an E-shaped structure.
As shown in fig. 2 and 3, the block 7 is provided with a pre-pressing piece, the pre-pressing piece comprises a pressing block 49, a first limit bolt 23, a first spring 22 and a nut 21, the first limit bolt 23 and the first spring 22 are both provided with two, the first limit bolt 23 passes through the pressing block 49 and is in threaded connection with the block 7, the nuts 21 on the same first limit bolt 23 are provided with two, the nuts 21 are arranged on the side surface of the first limit bolt 23, the first spring 22 is sleeved on the outer side of the first limit bolt 23, the two ends of the first spring are respectively abutted against the block 7 and the nuts 21, the elastic force of the first spring 22 applied to the nuts 21 enables the pressing block 49 to press the side surface of the magnetic core 1, and the pressure of the pressing block 49 to the magnetic core 1 is utilized to enable the block 7 not to be in direct contact with the magnetic core 1, so that relative sliding can occur between the magnetic core 1 and the pressing block 49 under the condition of being positioned and clamped, and support is provided for driving the two magnetic cores 1 to move by the wedge-shaped magnetic block 5.
As shown in fig. 2, 5 and 6, the second adjusting member 12 includes a second screw 40, two sections of threads with opposite rotation directions are provided on the second screw 40, a second chute is provided on the mounting seat 13, the sliding frame 38 is in a T-shaped structure, a protruding block 39 slidably disposed on the second chute is provided at the lower end of the sliding frame, the protruding block 39 is in threaded connection with the second screw 40, and by rotating the second screw 40, the two sliding frames 38 can slide along the second chute, and the two sliding frames 38 can move to drive the wedge-shaped magnetic blocks 5 to synchronously move, so that power can be provided for the movement of the two magnetic cores 1.
As shown in fig. 5 and 6, a positioning piece 32 for adjusting the relative distance between the wedge-shaped magnetic block 5 and the sliding frame 38 is arranged on the sliding frame 38, the positioning piece 32 comprises a first adjusting bolt 37, a second limiting bolt 36 and a second spring 35, the second limiting bolt 36 and the second spring 35 are both arranged at two, one end of the second limiting bolt 36 penetrates through the sliding frame 38 and then is fixedly connected with the wedge-shaped magnetic block 5, the second spring 35 is sleeved on the second limiting bolt 36, two ends of the second spring 35 respectively abut against the second limiting bolt 36 and the sliding frame 38, the first adjusting bolt 37 is in threaded connection with the sliding frame 38, one end of the first adjusting bolt 37 abuts against the wedge-shaped magnetic block 5 after penetrating through the sliding frame 38, the relative position between the wedge-shaped magnetic block 5 and the two magnetic cores 1 can be controlled by rotating the second limiting bolt 36 and the second spring 35, in a debugging stage, the same moving distance between the tip end faces of the two wedge-shaped magnetic blocks 5 and the side faces of the two magnetic cores 1 can be ensured, and simultaneously, and the two magnetic cores 1 can be kept to move synchronously.
As shown in fig. 2 and 3, the compressing element 3 includes a fixed block 16, a third limit bolt 17, a third spring 15 and a pressing plate 48, where the fixed block 16, the third limit bolt 17 and the third spring 15 are all provided with two, the fixed block 16 is fixedly arranged on the movable seat 9, one end of the third limit bolt 17 passes through the fixed block 16 and then is connected with the pressing plate 48 in a threaded manner, the third spring 15 is sleeved on the third limit bolt 17, and two ends respectively collide with the fixed block 16 and the pressing plate 48, the pressing plate 48 is provided with a convex column 4 that collides with the probe of the dial indicator 2, and the acting force exerted by the third spring 15 on the pressing plate 48 can fix the magnetic core 1 between the pressing plate 48 and the stop block 7, and can also realize quick dismounting of the magnetic core 1.
As shown in fig. 2 and 4, the third adjusting piece includes a fixed seat 31, a sliding block 27, a first guide rod 28, a fourth spring 26 and a second adjusting bolt 29, lugs 25 are disposed on the dial indicator 2, notches are disposed on the fixed seat 31, the first guide rod 28 and the fourth spring 26 are both disposed two, two ends of the first guide rod 28 are connected with the fixed seat 31, the sliding block 27 is slidably disposed with the two first guide rods 28, a groove for installing the lugs 25 is disposed on the sliding block 27, the fourth spring 26 is sleeved on the first guide rod 28, two ends of the fourth spring 26 respectively collide with the fixed seat 31 and the sliding block 27, the second adjusting bolt 29 is in threaded connection with the fixed seat 31, and a plug rod 30 matched with the locating lugs 25 is disposed on the second adjusting bolt 29, after the middle magnetic columns of the two magnetic cores 1 collide, one ends of the second adjusting bolt 29 push the sliding block 27 to compress the fourth spring 26, at this time, the dial indicator 2 moves synchronously with the sliding block 27 until the sliding block 27 collides with the two magnetic columns, the two magnetic cores 2 are separated by the corresponding probes, and the distance between the two magnetic cores 1 is measured, and the distance between the magnetic columns of the magnetic cores 1 is measured.
As shown in fig. 5 and 7, the clamping member 34 includes a driving rod 41, a first sliding rod 42, a second sliding rod 45 and a cover plate 43, two openings 46 matched with the coil tube 6 are provided on the mounting seat 13, a third sliding groove for sliding the first sliding rod 42, the second sliding rod 45 and the driving rod 41 is provided on the mounting seat 13, the directions of the first sliding rod 42 and the second sliding rod 45 are parallel, the two directions are perpendicular to the sliding direction of the driving rod 41, one end of the first sliding rod 42 and one end of the second sliding rod 45 away from each other are provided with a wedge-shaped boss 24 matched with the driving rod 41 in a sliding manner, one end of the first sliding rod 42 and one end of the second sliding rod 45 are also provided with a fifth spring 47, the fifth spring 47 is used for keeping the ends of the first sliding rod 42 and the second sliding rod 45 extend into the openings 46 and clamping the coil tube 6, the driving rod 41 is in an L-shaped structure, one end of the driving rod 41 is provided with a sixth spring 44, when the coil bobbin 6 is required to be mounted on the mounting seat 13, the driving rod 41 is pushed towards the direction of the sixth spring 44, so that the driving rod 41 compresses the sixth spring 44, the two wedge-shaped bosses 24 drive the first sliding rod 42 and the second sliding rod 45 to move and compress the fifth spring 47, the first sliding rod 42 and the second sliding rod 45 generate the action of retracting towards the inside of the mounting seat 13, after the coil bobbin 6 is mounted in the notch 46, the driving rod 41 is loosened, the driving rod 41 is reset under the action of the sixth spring 44, and the first sliding rod 42 and the second sliding rod 45 are reset under the action of the fifth spring 47 and abut against the two sides of the coil bobbin 6, so that clamping is realized.
As shown in fig. 2, the fourth adjusting member includes a third screw rod 18, a second guide rod 19 and a fixing plate 8, where the fixing plate 8 and the second guide rod 19 are both provided with two, the fixing plate 8 is fixed on the base 10, the two second guide rods 19 and the third screw rod 18 are both rotationally connected with the two fixing plates 8, two sections of threads with opposite rotation directions are provided on the third screw rod 18, the two movable seats 9 are slidably arranged with the second guide rod 19, and the two movable seats 9 are threadably connected with the third screw rod 18, and by rotating the third screw rod 18, the two movable seats 9 can slide along the second guide rod 19 and can approach or separate from each other, thereby facilitating the measurement of the air gap length of the two magnetic cores 1.
Working principle: when the magnetic property of the magnetic core 1 is measured, firstly, the magnetic columns on two sides of the magnetic core 1 with the E-shaped structure are ground into an inclined plane 33 which is the same as that of the wedge-shaped magnetic block 5, the inclined planes are respectively arranged between the pressing plate 48 and the stop block 7, the pressing plate 48 can keep the front and back positions of the magnetic core 1 unchanged, the stop block 7 is aligned with the left and right positions of the magnetic core 1 under the action of the first adjusting piece 14, then the probe of the dial indicator 2 is driven by the third adjusting piece to abut against the side face of the pressing plate 48, the reading is reset to zero, the coil cylinder 6 is fixed on the mounting seat 13 by the clamping piece 34, two ends of a wire are connected with the inductance measuring instrument 11, then the fourth adjusting piece is used for driving the two movable seats 9 to mutually approach, the middle magnetic columns of the two magnetic cores 1 abut against the wedge-shaped magnetic block 5, then the two sliding frames 38 drive the two wedge-shaped magnetic blocks 5 to mutually approach each other by rotating the second screw 40, the wedge-shaped magnetic block 5 pushes the two magnetic cores 1 to move towards two sides by utilizing the inclined planes 33, the magnetic cores 1 drive the pressing plate 48 to compress the first spring 22, at the moment, the probes of the dial indicator 2 are synchronously moved by the movement of the convex columns 4, the pointers on the dial indicator 2 rotate corresponding scales to facilitate the reading of operators, as the wedge-shaped magnetic block 5 always keeps abutting against the two magnetic cores 1, the three can keep the magnetic flux state, no air gap exists, the middle magnetic columns of the two magnetic cores 1 form the air gap because of the movement of the magnetic cores 1, the optimal value of the length of the air gap can be obtained by utilizing the inductance measuring instrument 11 to monitor the value of the inductance value of the wires on the coil tube 6 in real time, and under the condition of different air gap lengths, the air gap value of the optimal length can be measured at the moment when the variation of the inductance value is equal to 0, the air gap value is equal to the sum of the readings of the two dial indicators 2, the error measured by the method is small, data calculation is not needed, the operation is simple and convenient, and then the magnetic column in the middle of the normal magnetic core 1 is ground according to the readings of the dial indicators 2 as grinding quantity.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. A method for measuring magnetic characteristics of a magnetic core of a transformer, comprising the steps of:
s1: firstly, grinding a part of magnetic columns on two sides of two E-shaped magnetic cores (1) according to the angle of inclined planes (33) of wedge-shaped magnetic blocks (5), respectively fixing the two parts on two movable seats (9), and fixing and aligning the two magnetic cores (1) by virtue of a pressing plate (48) and a stop block (7);
s2: the coil cylinder (6) is fixed on the mounting seat (13), then the third screw rod (18) is rotated, so that the middle magnetic columns of the two magnetic cores (1) enter the coil cylinder (6) and are in contact with each other, a gap is reserved between the magnetic columns at the two sides of the magnetic cores (1), the second screw rod (40) is rotated, the wedge-shaped magnetic block (5) is in contact with the magnetic columns at the two sides of the two magnetic cores (1) by means of inclined planes (33), a magnetic conduction state is kept, the end faces of the wedge-shaped magnetic block (5) are level with the side faces of the magnetic columns at the two sides of the magnetic cores (1), and meanwhile, in the state, no air gap exists between the middle magnetic columns of the two magnetic cores (1);
s3: the probe of the dial indicator (2) is propped against the pressing plate (48) by rotating the second adjusting bolt (29), then the reading of the dial indicator (2) is zeroed, then the lead on the coil tube (6) is connected to the inductance measuring instrument (11), and a current with a preset value is introduced;
s4: each time the second screw (40) is rotated for a designated number of turns, so that the two wedge-shaped magnetic blocks (5) move by the same distance in the direction of approaching each other, the wedge-shaped magnetic blocks (5) push the two magnetic cores (1) to move by the same distance in the direction of separating from each other by means of the inclined planes (33), an air gap is formed between the middle magnetic columns of the two magnetic cores (1), and meanwhile, the dial indicator (2) can record the moving distance of the magnetic cores (1);
s5: under the condition that the two magnetic cores (1) have different air gap lengths, the inductance value of the conducting wire wound on the outer side of the coil tube (6) is measured by using the inductance measuring instrument (11), the inductance gradually decreases along with the increase of the air gap length, and when the variation of the inductance value is equal to 0, the optimal air gap length of the magnetic cores (1) can be measured.
2. The utility model provides a magnetic property measuring device of a transformer magnetic core, includes base (10) and movable seat (9), its characterized in that, movable seat (9) are provided with two, and two movable seat (9) are according to setting side by side, be provided with two dog (7) on movable seat (9), the one end and the movable seat (9) of dog (7) slide and set up, and the other end is higher than the surface of movable seat (9), be provided with on movable seat (9) and drive two dog (7) and keep away from each other or first regulating part (14) that are close to each other, and movable seat (9) still are provided with and are used for exerting pressure to magnetic core (1) so that magnetic core (1) is supported and lean on compressing tightly piece (3) of dog (7) side, two be provided with mount pad (13) between movable seat (9), be provided with wire reel (6) on mount pad (13), and be provided with clamp piece (34) that are used for fixed wire reel (6) on mount pad (13), be provided with carriage (38) on mount pad (13), be provided with wedge-shaped magnetic core (33) on two sides (5), the utility model discloses a spring limit pressing device, including a spring and a limit pressing piece, including a base (13), a movable seat (9), a base (10), a movable seat (9), a second adjusting piece (12) for driving two sliding frames (38) to be close to each other or to be far away from each other, be provided with third adjusting piece on the movable seat (9), install percentage table (2) on the third adjusting piece, the probe of percentage table (2) is contradicted with compact piece (3), be provided with inductance measuring instrument (11) on base (10), coil bobbin (6) are gone up and are wound up a plurality of turns wire, both ends and inductance measuring instrument (11) electric connection of wire, be provided with on base (10) and be used for adjusting the fourth adjusting piece of distance between two movable seats (9), be provided with first spout on movable seat (9), the lower extreme slip of dog (7) is set up in first spout, first adjusting piece (14) are including first screw rod (20), the both ends and movable seat (9) of first screw rod (20) are rotated and are connected, have both ends to rotate opposite, and have a screw thread (7), two pre-pressed dog (21) and a spring and a limit pressing piece (23) are provided with on the first screw bolt (23), the utility model discloses a magnetic core (1) is fixed, including dog (7), nut (21) are provided with two, nut (21) are installed in the side of first stop bolt (23), first stop bolt (23) pass behind briquetting (49) with dog (7) threaded connection, on same first stop bolt (23), and first spring (22) cover is established in the outside of first stop bolt (23), and both ends are contradicted with dog (7) and nut (21) respectively, elasticity that first spring (22) applyed nut (21) makes briquetting (49) support and presses in the side of magnetic core (1).
3. The device for measuring the magnetic characteristics of the magnetic core of the transformer according to claim 2, wherein the second adjusting member (12) comprises a second screw (40), two sections of threads with opposite rotation directions are arranged on the second screw (40), a second sliding groove is arranged on the mounting seat (13), the sliding frame (38) is of a T-shaped structure, a protruding block (39) which is slidably arranged with the second sliding groove is arranged at the lower end of the sliding frame, and the protruding block (39) is in threaded connection with the second screw (40).
4. A magnetic core magnetic property measuring device for a transformer according to claim 3, characterized in that a positioning piece (32) for adjusting the relative distance between the wedge-shaped magnetic block (5) and the sliding frame (38) is arranged on the sliding frame (38), the positioning piece (32) comprises a first adjusting bolt (37), a second limiting bolt (36) and a second spring (35), the second limiting bolt (36) and the second spring (35) are both provided with two, one end of the second limiting bolt (36) passes through the sliding frame (38) and then is fixedly connected with the wedge-shaped magnetic block (5), the second spring (35) is sleeved on the second limiting bolt (36), two ends of the second spring are respectively abutted against the second limiting bolt (36) and the sliding frame (38), the first adjusting bolt (37) is in threaded connection with the sliding frame (38), and one end of the first adjusting bolt (37) passes through the sliding frame (38) and then is abutted against the wedge-shaped magnetic block (5).
5. The device for measuring the magnetic characteristics of the magnetic core of the transformer according to claim 2, wherein the pressing piece (3) comprises a fixed block (16), a third limit bolt (17), a third spring (15) and a pressing plate (48), the fixed block (16), the third limit bolt (17) and the third spring (15) are all provided with two, the fixed block (16) is fixedly arranged on the movable seat (9), one end of the third limit bolt (17) passes through the fixed block (16) and then is in threaded connection with the pressing plate (48), the third spring (15) is sleeved on the third limit bolt (17), two ends of the third spring are respectively abutted against the fixed block (16) and the pressing plate (48), and a convex column (4) abutted against a probe of the dial indicator (2) is arranged on the pressing plate (48).
6. The magnetic property measuring device for the magnetic core of the transformer according to claim 2, wherein the third adjusting piece comprises a fixed seat (31), a sliding block (27), a first guide rod (28), a fourth spring (26) and a second adjusting bolt (29), lugs (25) are arranged on the dial indicator (2), notches are arranged on the fixed seat (31), the first guide rod (28) and the fourth spring (26) are both arranged two, two ends of the first guide rod (28) are connected with the fixed seat (31), the sliding block (27) is slidably arranged with the two first guide rods (28), grooves for installing the lugs (25) are arranged on the sliding block (27), the fourth spring (26) is sleeved on the first guide rod (28), two ends of the fourth spring (26) are respectively abutted with the fixed seat (31) and the sliding block (27), the second adjusting bolt (29) is in threaded connection with the fixed seat (31), and the second adjusting bolt (29) is provided with a plug-in rod (30) matched with the locating bolt (25).
7. The device for measuring the magnetic characteristics of the magnetic core of the transformer according to claim 6, wherein the clamping piece (34) comprises a driving rod (41), a first sliding rod (42), a second sliding rod (45) and a cover plate (43), two openings (46) matched with the coil cylinder (6) are formed in the mounting seat (13), a third sliding groove for enabling the first sliding rod (42), the second sliding rod (45) and the driving rod (41) to slide is formed in the mounting seat (13), the directions of the first sliding rod (42) and the second sliding rod (45) are parallel, the directions of the first sliding rod and the second sliding rod are perpendicular to the sliding direction of the driving rod (41), a wedge-shaped boss (24) in sliding fit with the driving rod (41) is formed at one end of the first sliding rod (42) and one end of the second sliding rod (45), a fifth spring (47) is used for keeping the ends of the first sliding rod (42) and the second sliding rod (45) to extend into the openings (46) and enable the coil cylinder (6) to be connected with the six end of the driving rod (41), and the cover plate (43) is fixedly arranged at one end of the driving rod (41).
8. The device for measuring the magnetic characteristics of the magnetic core of the transformer according to claim 2, wherein the fourth adjusting piece comprises a third screw rod (18), a second guide rod (19) and a fixed plate (8), the fixed plate (8) and the second guide rod (19) are both provided with two, the fixed plate (8) is fixed on the base (10), the two second guide rods (19) and the third screw rod (18) are both rotationally connected with the two fixed plates (8), two sections of threads with opposite rotation directions are arranged on the third screw rod (18), the two movable seats (9) are slidably arranged with the second guide rod (19), and the two movable seats (9) are in threaded connection with the third screw rod (18).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117872041A (en) * | 2024-03-13 | 2024-04-12 | 国网辽宁省电力有限公司大连供电公司 | Online monitoring equipment for voltage faults of power distribution network |
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