CN112768214A - Small-size current transformer iron core structure for protection - Google Patents
Small-size current transformer iron core structure for protection Download PDFInfo
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- CN112768214A CN112768214A CN202011554633.9A CN202011554633A CN112768214A CN 112768214 A CN112768214 A CN 112768214A CN 202011554633 A CN202011554633 A CN 202011554633A CN 112768214 A CN112768214 A CN 112768214A
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- joint
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- outer cover
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention provides a small-sized current transformer iron core structure for protection, which comprises an upper iron core sheet, a lower iron core sheet and a framework, wherein the lower end of the upper iron core sheet is fixedly provided with the lower iron core sheet, the bottoms of the left and right ends of the upper iron core sheet are fixedly connected with a first joint, the framework is fixedly arranged at the joint of the upper iron core sheet and the lower iron core sheet, the interior of the framework is fixedly clamped with a clamping groove, and a coil is wound at the upper end of the framework. Is very convenient.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a small current transformer iron core structure for protection.
Background
At present, along with the continuous development of smart power grids, the required precision to various mutual-inductors is higher, the demand is also bigger and bigger, commonly used mutual-inductor iron core structure is mainly with the lamination formula, there are O type and L type isotructure, O type mutual-inductor coil coiling inefficiency, L type mutual-inductor coil coiling is efficient, but iron core inserted sheet assembly efficiency is low, still need riveting or welding process, equally can not improve efficiency effectively, reduce cost, in addition, the amalgamation face of L type iron core is the straight face, because make precision scheduling problem, must leave certain space in amalgamation face department, caused great magnetic gap to exist, be unfavorable for the improvement of mutual-inductor characteristic.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a small-sized current transformer core structure for protection, so as to solve the above-described problems.
The invention relates to a purpose and an effect of a small-sized current transformer iron core structure for protection, which are achieved by the following specific technical means: the utility model provides a small-size current transformer iron core structure is used in protection, including last iron core piece, lower iron core piece, the skeleton, go up iron core piece lower extreme fixed mounting and have lower iron core piece, go up the equal fixedly connected with joint one in both ends bottom about the iron core piece, the equal fixedly connected with joint two in both ends top about the iron core piece is down, it is equipped with the block groove with joint one both sides about, it also is equipped with the block groove with joint two junction left and right sides to go up the iron core piece, joint one and joint two blocks, it has the skeleton with iron core piece junction fixed mounting down to go up iron core piece, and the skeleton is inside fixed with block groove block, the coil has been convoluteed to the skeleton upper end.
Preferably, the skeleton is including the dustcoat, the limiting plate, the fixed plate, splint, spring one, the inserted bar, spring two, the dustcoat is the rectangle tubulose, the equal fixedly connected with limiting plate of lower extreme on the dustcoat, the limiting plate is "back" shape, the equal fixedly connected with fixed plate of the equal both sides in the lower extreme entrance about the dustcoat, the fixed plate is close to that the inside one end of dustcoat all articulates there is splint, fixedly connected with spring one between splint and the dustcoat inboard, the inside left and right sides central point of dustcoat puts the upper and lower extreme and all rotates and be connected with the inserted bar, the inserted bar is close to fixedly connected with spring.
Preferably, the clamping plate is bent and is correspondingly clamped with the clamping groove.
Preferably, the first connector and the second connector are arranged in a mirror symmetry mode, the joint between the first connector and the second connector is Z-shaped, a first limiting groove is formed in one end, close to the second connector, of the first connector, a hollow circular groove is formed in one end, far away from the second connector, of the first connector, a jacking block is movably connected to the inside of the hollow circular groove in a horizontal direction, a spring is fixedly connected to the inside of the jacking block and the inside of the hollow circular groove, and the jacking block is correspondingly clamped with the limiting groove.
Preferably, the first joint and the second joint are both provided with a second limiting groove, the second limiting groove and the inserted rod are in the same horizontal plane, and the diameter of the inserted rod is smaller than that of the second limiting groove.
Preferably, both sides of the first joint and the second joint are obliquely arranged.
Preferably, the skeleton is provided in two groups.
Preferably, the iron core is a steel sheet iron core in a non-standard Chinese character 'shan' shape, and a small resistor is installed in the box body for installing the iron core.
Has the advantages that:
1. the upper iron core sheet and the lower iron core sheet are fixedly installed through the framework, screw riveting or welding is not needed, the installation is very convenient, the installation of the framework is simplified, and the operation is more convenient.
2. The joint between the first joint and the second joint is Z-shaped, so that a transverse section and a longitudinal section are connected between the upper iron core sheet and the lower iron core sheet, the upper iron core sheet and the lower iron core sheet are connected all the time, and meanwhile, the inserted rod is clamped into the second limit groove, so that the first joint and the second joint are connected more tightly and are not easy to generate gaps.
3. Go up the iron core piece and when lower iron core piece gets into the skeleton, the top moves splint and moves inwards, after in the dustcoat is all got into with joint two to joint one, splint reset the card through spring one and go into the block groove, support and connect first or connect two, meanwhile the inserted bar inserts spacing groove two, further the connection of having stabilized joint one with joint two, go up difficult the breaking away from between iron core piece and the lower iron core piece, make the skeleton not just can stabilize through rivet or welding and connect between iron core piece and the lower iron core piece simultaneously, it is very convenient.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of an iron core assembly structure according to the present invention.
Fig. 3 is a schematic view of a core splitting structure according to the present invention.
FIG. 4 is a schematic cross-sectional view of the skeleton of the present invention.
FIG. 5 is an enlarged view of the structure at A in FIG. 2 according to the present invention.
FIG. 6 is an enlarged view of the structure at B in FIG. 3 according to the present invention.
FIG. 7 is a bottom view of the case of the present invention.
Fig. 8 is a waveform diagram of a previous fault according to the present invention.
Fig. 9 is a waveform diagram illustrating a last fault according to the present invention.
In fig. 1 to 9, the correspondence between the component names and the reference numbers is:
the device comprises an upper iron core sheet 1, a lower iron core sheet 2, a framework 3, an outer cover 31, a limiting plate 32, a fixing plate 33, a clamping plate 34, a first spring 35, an inserting rod 36, a second spring 37, a coil 4, a clamping groove 5, a first joint 6, a hollow circular groove 61, a top block 62, a first limiting groove 63, a second limiting groove 64 and a second joint 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example (b):
as shown in figures 1 to 9: the utility model provides a small-size current transformer iron core structure is used in protection, including last iron core piece 1, lower iron core piece 2, skeleton 3, go up iron core piece 1 lower extreme fixed mounting has lower iron core piece 2, go up iron core piece 1 and control the equal fixedly connected with joint first 6 in both ends bottom, lower iron core piece 2 controls the equal fixedly connected with joint second 7 in both ends top, it is equipped with block groove 5 with joint first 6 junction left and right sides to go up iron core piece 1, lower iron core piece 2 also is equipped with block groove 5 with joint second 7 junction left and right sides, joint first 6 and joint second 7 block, it has skeleton 3 with lower iron core piece 2 junction fixed mounting to go up iron core piece 1, and skeleton 3 is inside to be fixed with block groove 5 block, skeleton 3 upper end coiling has coil 4, coil 4 is the enameled wire, the enameled wire is twined on skeleton 3 for the power is connected.
Wherein: the framework 3 comprises an outer cover 31, a limiting plate 32, a fixing plate 33, a clamping plate 34, a first spring 35, an inserting rod 36 and a second spring 37, wherein the outer cover 31 is in a rectangular tube shape, the upper end and the lower end of the outer cover 31 are fixedly connected with the limiting plate 32, the limiting plate 32 is in a 'return' shape, the left side and the right side of an inlet at the upper end and the lower end of the outer cover 31 are fixedly connected with the fixing plate 33, one end of the fixing plate 33 close to the inner part of the outer cover 31 is hinged with the clamping plate 34, the first spring 35 is fixedly connected between the clamping plate 34 and the inner side of the outer cover 31, the upper end and the lower end of the central position at the left side and the right side of the inner part of the outer cover 31 are rotatably connected with the inserting rod 36, the second spring 37 is fixedly connected between one side of the inserting rod 36 close to the center of the outer cover 31 and the inner wall of the, the first joint 6 and the second joint 7 enter the outer cover 31, meanwhile, the inclined surfaces at the two sides of the first joint 6 and the second joint 7 push the inserted link 36 to rotate towards one side of the center of the outer cover 31, and after the first joint and the second joint 7 enter the center of the outer cover 31, the first joint 6 and the second joint 7 are mutually clamped.
Wherein: the splint 34 is the form of buckling, and splint 34 corresponds the block with the block groove 5, after connecting one 6 and connecting two 7 entering dustcoat 31 interior block, splint 34 then promotes rotatory card through the reaction force of spring one and goes into block groove 5 in, splint 34 supports block groove 5, connect one 6 and connect two 7 difficult separations, make the skeleton 3 press from both sides tightly between last iron core piece 1 and lower iron core piece 2 simultaneously, do not need rivet and other complicated fixed connection modes just can fix, it is very convenient to install.
Wherein: the first joint 6 and the second joint 7 are arranged in mirror symmetry, the joint between the first joint 6 and the second joint 7 is Z-shaped, one ends of the first joint 6 and the second joint 7, which are close to each other, are provided with first limit grooves 63, one ends of the first joint 6 and the second joint 7, which are far away from each other, are provided with hollow circular grooves 61, the hollow circular grooves 61 are horizontally and movably connected with top blocks 62, the top blocks 62 are fixedly connected with springs in the hollow circular grooves 61, the top blocks 62 are correspondingly clamped with the first limit grooves 63, the Z-shaped connecting surfaces enable the upper iron core sheets 1 and the lower iron core sheets 2 to be connected with each other in a transverse cross section and a longitudinal cross section, the upper iron core sheets 1 and the lower iron core sheets 2 to be connected with each other all the time, meanwhile, the inserted rod 36 is clamped into the second limit grooves 64, the first joint 6 and the second joint 7 are connected more tightly, gaps are not easy to generate, the top blocks 62 enter the hollow circular grooves 61 under the, the top block 62 is clipped in corresponding to the first limit groove 63, so that the connection between the first joint 6 and the second joint 7 is more stable.
Wherein: two sides of the first joint 6 and the second joint 7 are provided with a second limit groove 64, the second limit groove 64 and the inserted rod 36 are positioned on the same horizontal plane, and the diameter of the inserted rod 36 is smaller than that of the second limit groove 64, so that the inserted rod 36 can be conveniently inserted into the second limit groove 64.
Wherein: the first joint 6 and the second joint 7 are arranged in a manner of inclining on two sides, so that the clamping plate 34 is convenient to push against, and meanwhile, the inserted rod 36 can rotate along with the friction stress of the inclined surfaces on two sides to be inserted into the second limit groove 64, so that the first joint 6 and the second joint 7 are more tightly connected, and meanwhile, the framework 3 is further stabilized between the upper iron core sheet 1 and the lower iron core sheet 2.
Wherein: the framework 3 is provided with two groups.
Wherein: the iron core is a steel sheet iron core in a non-standard Chinese character 'shan' shape, and a small resistor is installed in the box body for installing the iron core, so that the precision is improved for the precision, and the error is reduced.
The working principle is as follows: firstly, inserting the first joint 6 of the upper iron core sheet 1 and the second joint 7 of the lower iron core sheet 2 into the central opening of the outer cover 31, enabling the inclined surfaces at the two sides of the first joint 6 and the second joint 7 to push the movable clamping plates 34 to rotate towards the inner wall of the outer cover 31, enabling the first joint 6 and the second joint 7 to enter the outer cover 31, enabling the inclined surfaces at the two sides of the first joint 6 and the second joint 7 to push the inserted rods 36 to rotate towards one side of the center of the outer cover 31, when the first joint 6 and the second joint 7 enter the center of the outer cover 31, mutually clamping the first joint 6 and the second joint 7, simultaneously clamping the inserted rods 36 into the limiting grooves two 64, enabling the first joint 6 and the second joint 7 to be connected more tightly and not to generate gaps, enabling the top block 62 to enter the hollow circular groove 61 by extrusion force, after the clamping between the first joint 6 and the second joint 7 is completed, enabling the first joint 6 and the second joint 7 to be connected more stably, and after the first joint 6 and the second joint 7 enter the outer cover 31, the clamping plate 34 is pushed to rotate to be clamped into the clamping groove 5 through the reaction force of the first spring, the clamping plate 34 is abutted against the clamping groove 5, the first connector 6 and the second connector 7 are not easy to separate, meanwhile, the framework 3 is clamped between the upper iron core sheet 1 and the lower iron core sheet 2, the upper iron core sheet and the lower iron core sheet can be fixed without rivets or other complex fixed connection modes, and the installation is very convenient.
Example two
● Material specification of Current Transformer
1. Power consumption
At rated current, not more than 0.5VA
2. Transmission and transformation performance
2.1 CT parameter specification
Rated frequency 50HZ
Rated currents of 1A and 5A
2.2 CT Angle Difference, Difference of ratios nonlinearity
2.3 transient behavior
20 times rated current full offset, a primary system time constant of 100ms, a fault time of 100ms, a two-time fault interval time of 1s (automatic reclosing), and no distortion of CT output waveform.
Blue waveform-one time 20In current full shift;
red waveform-LH 200A (40A)/3.53V-G + secondary output;
yellow waveform, LH30/3.53-2 secondary output (compare with conventional products);
FIG. 8 shows a previous fault waveform;
fig. 9 shows the last fault waveform.
2.4 CT has anti-electromagnetic interference characteristic, fast transient, common mode surge, differential mode surge, oscillation wave, ring wave to CT
The transmission and transformation are not affected.
2.5, the output voltage at rated current is 88.25 mV.
● mechanical and thermal stress
2In current, continuous operation; current 40In for 4 seconds; 100In current for 1 second
Dynamic stability, namely single 40 times rated current impact, and no change of mechanical and electrical characteristics.
● Security feature
Safety of electric appliances
Insulation resistance >1. ohm) (insulation resistance greater than 200Mohm 1 hour after completion of the damp heat test item in accordance with DL-479-. )
Dielectric strength of 3500VAC leakage current <0.4mA
Impact pressure resistance >5000V
② safety of ignition
The composition materials of the product are all flame-retardant materials, and the flame-retardant grade of all organic materials reaches V-1 grade.
③ electromagnetic compatibility
Surge 4-level (common mode) 4-level (differential mode)
4-stage oscillating wave
Ringing 4-level
Note that in the above test, the secondary sides of the CT were all connected in parallel with corresponding resistors.
● environmental characteristics
Temperature and atmospheric environment
The environmental temperature is-40 ℃ to +80 ℃;
relative humidity of 5-95%;
the atmospheric pressure is 80kPa to 106 kPa.
② machinery
Vibration response class I
Vibration durable class I
Impulse response class I
Impact durability class I
Impact class I
● storage
The packaged product should be stored indoors at-10 deg.C to +40 deg.C with relative humidity not greater than 80% and ambient air containing no corrosive, fire and explosive substances.
Claims (8)
1. The utility model provides a small-size current transformer iron core structure is used in protection, includes iron core piece (1), lower iron core piece (2), skeleton (3), its characterized in that: go up iron core piece (1) lower extreme fixed mounting and have lower iron core piece (2), go up iron core piece (1) and control the equal fixedly connected with joint one (6) in both ends bottom, the equal fixedly connected with joint two (7) in both ends top about iron core piece (2) down, it is equipped with block groove (5) with joint one (6) junction left and right sides to go up iron core piece (1), iron core piece (2) also is equipped with block groove (5) with joint two (7) junction left and right sides down, joint one (6) and joint two (7) block, it has skeleton (3) with lower iron core piece (2) junction fixed mounting to go up iron core piece (1), and inside and block groove (5) block of skeleton (3) are fixed, the coiling of skeleton (3) upper end has coil (4).
2. A small-sized current transformer core structure for protection according to claim 1, characterized in that: the framework (3) comprises an outer cover (31), a limiting plate (32), a fixing plate (33), a clamping plate (34), a first spring (35), an inserted link (36) and a second spring (37), the outer cover (31) is in a rectangular tube shape, the upper end and the lower end of the outer cover (31) are fixedly connected with limit plates (32), the limiting plate (32) is in a shape of 'hui', the left side and the right side of the inlet of the upper end and the lower end of the outer cover (31) are fixedly connected with a fixing plate (33), one end of the fixing plate (33) close to the inner part of the outer cover (31) is hinged with a clamping plate (34), a first spring (35) is fixedly connected between the splint (34) and the inner side of the outer cover (31), the upper end and the lower end of the central positions of the left side and the right side in the outer cover (31) are both rotationally connected with inserted rods (36), and a second spring (37) is fixedly connected between one side of the inserted bar (36), which is close to the center of the outer cover (31), and the inner wall of the outer cover (31).
3. A small-sized current transformer core structure for protection according to claim 2, characterized in that: the clamping plate (34) is bent, and the clamping plate (34) is correspondingly clamped with the clamping groove (5).
4. A small-sized current transformer core structure for protection according to claim 1, characterized in that: joint one (6) and joint two (7) are mirror symmetry and set up, and the junction is "Z" shape between joint one (6) and the joint two (7), and joint one (6) and joint two (7) are close to one end and all are equipped with spacing groove one (63), joint one (6) and joint two (7) are kept away from one end and all are equipped with hollow circular slot (61), and the water level moves smoothly in hollow circular slot (61) and is connected with kicking block (62), fixedly connected with spring in kicking block (62) and hollow circular slot (61), kicking block (62) correspond the joint with spacing groove one (63).
5. A small-sized current transformer core structure for protection according to claim 1, characterized in that: and two sides of the first joint (6) and the second joint (7) are respectively provided with a second limiting groove (64), the second limiting groove (64) and the inserted rod (36) are positioned on the same horizontal plane, and the diameter of the inserted rod (36) is smaller than that of the second limiting groove (64).
6. A small-sized current transformer core structure for protection according to claim 1, characterized in that: the first joint (6) and the second joint (7) are obliquely arranged on two sides.
7. A small-sized current transformer core structure for protection according to claim 1, characterized in that: the framework (3) is provided with two groups.
8. A small-sized current transformer core structure for protection according to claim 1, characterized in that: the iron core is a steel sheet iron core in a non-standard Chinese character 'shan' shape, and a small resistor is installed in the box body for installing the iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011554633.9A CN112768214B (en) | 2020-12-24 | 2020-12-24 | Small-size current transformer iron core structure for protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011554633.9A CN112768214B (en) | 2020-12-24 | 2020-12-24 | Small-size current transformer iron core structure for protection |
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| Publication Number | Publication Date |
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| CN112768214A true CN112768214A (en) | 2021-05-07 |
| CN112768214B CN112768214B (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793747A (en) * | 2021-08-26 | 2021-12-14 | 力维兴电子（深圳)有限公司 | Leakage inductance control device and control method of LLC transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793747A (en) * | 2021-08-26 | 2021-12-14 | 力维兴电子（深圳)有限公司 | Leakage inductance control device and control method of LLC transformer |
| CN113793747B (en) * | 2021-08-26 | 2023-07-18 | 力维兴电子（深圳)有限公司 | Leakage inductance control device and control method of LLC transformer |
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| Publication number | Publication date |
|---|---|
| CN112768214B (en) | 2023-02-24 |
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