CN210534264U - Partial discharge detection sensor - Google Patents
Partial discharge detection sensor Download PDFInfo
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- CN210534264U CN210534264U CN201921177091.0U CN201921177091U CN210534264U CN 210534264 U CN210534264 U CN 210534264U CN 201921177091 U CN201921177091 U CN 201921177091U CN 210534264 U CN210534264 U CN 210534264U
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Abstract
The utility model discloses a partial discharge detection sensor, include: a first half-ring core piece; the second semicircular magnetic core piece is arranged corresponding to the first semicircular magnetic core piece and surrounds the circumferential direction of the element to be tested; the first half-ring core piece and/or the second half-ring core piece comprise at least two core segments connected together. The first half-ring magnetic core piece and/or the second half-ring magnetic core piece are/is formed by at least two magnetic core blocks which are connected together, so that the problems that in the prior art, a partial discharge detection sensor for equipment to be detected with a large cross section diameter is difficult to produce and manufacture, has high production and use cost, is difficult to realize batch production, and even cannot produce and manufacture are solved.
Description
Technical Field
The utility model relates to a partial discharge detection technical field, concretely relates to partial discharge detection sensor.
Background
The discharge that occurs only in a local area in the insulator, but does not penetrate between the conductors to which the voltage is applied, may occur in the vicinity of the conductors or elsewhere, and this phenomenon is called a partial discharge. Although partial discharge is only a very small energy release, usually the discharge capacity is pC (picocoulomb), the damage of partial discharge is not insignificant. The discharge amount of the partial discharge is small and difficult to detect, and long-term partial discharge can accelerate the aging and deterioration of key materials of equipment, finally cause the functional damage of the equipment and cause serious damage of power failure, explosion and even casualties.
Chinese patent document CN208188187U discloses a high-frequency current sensor for detecting partial discharge of a cable, in which a main body of the current sensor in the prior art is composed of two half-ring magnetic cores and a package casing, and ferrite is often used as a magnetic core material. The ferrite core needs to be sintered by applying high pressure in the manufacturing process. And the inner diameter of the traditional high-frequency current sensor can only reach 60mm at most due to the existing process conditions. Therefore, the current sensor in the prior art needs to be installed at a position with a small installation cross section diameter, such as a ground wire.
If a semi-ring magnetic core with a diameter of more than 100mm is to be prepared to correspond to a cable, a sleeve and other objects to be tested with a large cross-section diameter, a kiloton-level press is required to provide sufficient pressure in the preparation process, so that the use cost of the instrument is high, mass production is difficult to realize, and the problem of no economy is caused. Even for the device equipment with larger diameter to be measured of the cable body and the sleeve, the problem that the existing partial discharge detection sensor cannot be installed on the body of the device equipment exists.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims at providing a partial discharge detection sensor and manufacturing method thereof, the technical problem that solve lie in the partial discharge detection sensor who is used for the great equipment that awaits measuring of cross section diameter among the prior art, and it is difficult to manufacture, has the production use cost height, is difficult to realize batch production, can't produce the problem of manufacturing even. Therefore, the utility model provides a partial discharge detection sensor, its detection range is 3MHz to 36MHz, and partial discharge detection sensor includes:
a first half-ring core piece;
the second semicircular magnetic core piece is arranged corresponding to the first semicircular magnetic core piece and surrounds the circumferential direction of the element to be tested;
the first half-ring core piece and/or the second half-ring core piece comprise at least two core segments connected together.
At least two of the core segments are secured together by an adhesive, such as epoxy.
And conducting wires are arranged inside the first semi-ring magnetic core piece and the second semi-ring magnetic core piece, and the conducting wires transmit signals outwards through a BNC connector or a TNC connector.
A BNC connector is a connector for coaxial cables. BNC has the advantages of long transmission distance and stable signal.
TNC connectors are variations of BNC connectors that employ threaded connections for connecting coaxial cables in radios and test instruments. TNC connectors have better performance at microwave frequencies than BNC connectors.
The lead is formed by winding a Rogowski coil structure.
At least two of the core segments that make up the first half-ring core piece are equal halves of equal size and shape; and/or at least two of the core segments making up the second half-ring core piece are equal size and shape halves.
The first half-ring core piece and the second half-ring core piece are respectively formed by at least two core segments, and the size and the shape of each core segment are the same.
The first and/or second half-ring core pieces are made up of 8 of the core segments; and/or the first half-ring core piece and/or the second half-ring core piece are composed of 4 core segments.
And the outer surfaces of the first semi-ring magnetic core piece and the second semi-ring magnetic core piece are provided with metal shells.
The first half-ring magnetic core piece and the second half-ring magnetic core piece are hinged together and are opened or closed through a buckle structure.
A method of manufacturing a partial discharge detection sensor, comprising the steps of:
step S1, manufacturing magnetic core blocks through ferrite material preparation, blank making, pressing and sintering;
step S2, winding a coil on the magnetic core block and installing a lead connector;
a step S3 of fixing a plurality of core segments together to constitute the first half-ring core piece and/or the second half-ring core piece;
step S3, connecting the first half-ring core piece and the second half-ring core piece together.
The technical scheme of the utility model, have following advantage:
1. the utility model provides a partial discharge detection sensor, include: a first half-ring core piece; the second semicircular magnetic core piece is arranged corresponding to the first semicircular magnetic core piece and surrounds the circumferential direction of the element to be tested; either or both of the first half-ring core piece and the second half-ring core piece are formed of at least two core segments joined together. The existing partial discharge detection sensor is composed of two semi-ring magnetic cores and a packaging shell, and ferrite is often selected as a magnetic core material. And the inner diameter of the traditional high-frequency current sensor can only reach 60mm or less at most due to the existing process conditions. To produce a half-ring core in the range of 100mm or more, a kiloton press is required to provide sufficient pressure during the production process. However, the kiloton-class press is high in use cost and difficult to realize mass production, and the existing partial discharge detection sensor cannot meet the partial discharge measurement requirement of a cable body with a large cross section diameter and a sleeve waiting element. The utility model discloses a link together the first half ring magnetic core piece that constitutes with a plurality of magnetic core piecemeals with half ring magnetic core piece of second. When the partial discharge detection sensor with a large cross section diameter needs to be manufactured, a manufacturer can combine and connect a plurality of magnetic cores in blocks according to needs, so that the first half-ring magnetic core piece or the second half-ring magnetic core piece can be manufactured without a kiloton-level press, the manufacturing cost of the partial discharge detection sensor with a large diameter size is reduced, and the problem that the existing sensor of a part of large-size to-be-detected elements cannot measure is solved.
2. The utility model provides a partial discharge detection sensor, a plurality of magnetic core piecemeals pass through the epoxy gluing agent and are fixed together to constitute first half ring magnetic core piece or the half ring magnetic core piece of second. The resin adhesive is double-component glue, needs AB mixing for use, can be filled in larger gaps, is suitable for general environments, and has the advantages of water resistance, oil resistance, strong acid and alkali resistance. The epoxy adhesive can effectively and firmly fix the plurality of magnetic core blocks together.
3. The utility model provides a partial discharge detection sensor, first semi-ring magnetic core piece and second semi-ring magnetic core piece are provided with the wire, and above-mentioned wire adopts the winding of rogowski coil structure to form. The wire can stably and reliably transmit signals outwards through the BNC connector or the TNC connector. The transmission signal is data information measured by the partial discharge detection sensor.
4. The utility model provides a partial discharge detection sensor, constitute at least two magnetic core piecemeals of first semicircle magnetic core piece for size and equal halving of shape; and/or at least two of the core segments making up the second half-ring core piece are equal size and shape halves. The first half-ring magnetic core piece or the second half-ring magnetic core piece is formed by the plurality of magnetic core blocks with the same size and shape, so that a manufacturer can conveniently manufacture the magnetic core blocks, and the manufacturing cost of the partial discharge detection sensor is reduced.
5. The utility model provides a partial discharge detection sensor, first half ring magnetic core piece with its two of second half ring magnetic core piece is respectively through at least two the magnetic core piecemeal constitutes, and the size and the shape homogeneous phase of every above-mentioned magnetic core piecemeal. The size and the shape of each magnetic core block on the first semi-ring magnetic core piece and the second semi-ring magnetic core piece are identical through an equal angle equal division mode, so that the magnetic core blocks forming the first semi-ring magnetic core piece and the second semi-ring magnetic core piece can be used commonly, manufacturers can conveniently manufacture the magnetic core blocks, and the production and manufacturing cost of the partial discharge detection sensor is reduced.
6. The utility model provides a partial discharge detection sensor, first semi-ring magnetic core piece with second semi-ring magnetic core piece surface is provided with metal casing, and above-mentioned metal casing can protect first semi-ring magnetic core piece and the semi-ring magnetic core piece of second that constitutes by the magnetic core piecemeal effectively.
7. The utility model provides a partial discharge detection sensor, first semi-ring magnetic core piece with second semi-ring magnetic core piece is together articulated, opens or is closed through buckle structure. One end of the first semi-ring magnetic core piece and one end of the second semi-ring magnetic core piece are connected together through a hinge shaft pin, and the other ends of the first semi-ring magnetic core piece and the second semi-ring magnetic core piece are detachably connected through a buckle structure formed by a clamping hook and a clamping groove, so that the partial discharge detection sensor can be arranged around the circumferential direction of the element to be detected.
8. The utility model provides a manufacturing method of partial discharge detection sensor, including following step: step S1, manufacturing magnetic core blocks through ferrite material preparation, blank making, pressing and sintering; step S2, winding a coil on the magnetic core block and installing a lead connector; a step S3 of fixing a plurality of core segments together to constitute the first half-ring core piece and/or the second half-ring core piece; step S3, connecting the first half-ring core piece and the second half-ring core piece together. Through producing magnetic core piecemeal alone, the partial discharge detection sensor is constituteed to a plurality of magnetic core piecemeal rethread, can reduce its manufacturing cost of major diameter size's partial discharge detection sensor effectively, improves product competitiveness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a partial discharge detection sensor for detecting a device under test according to the present invention;
fig. 2 is a schematic perspective view of a first half-ring core member according to the present invention;
fig. 3 is a schematic perspective view of a second half-ring magnetic core member according to the present invention;
fig. 4 is the utility model provides an its capability test result picture of partial discharge detection sensor.
Description of reference numerals:
1-a first half-ring core piece; 2-a second half-ring core piece; 3-a device under test; 4-magnetic core blocking.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a partial discharge detection sensor, which has a detection range from 3MHz to 36MHz, and the partial discharge detection sensor is shown in fig. 1 to 3, and includes:
the first half-ring magnetic core piece 1 is composed of 8 magnetic core blocks 4, and the adjacent magnetic core blocks 4 are fixed together through epoxy resin adhesive;
the second semicircular magnetic core piece 2 is arranged corresponding to the first semicircular magnetic core piece 1, the second semicircular magnetic core piece 2 is composed of 8 magnetic core blocks 4, the size and the shape of each magnetic core block 4 which forms the first semicircular magnetic core piece 1 and the second semicircular magnetic core piece 2 are the same, and the adjacent magnetic core blocks 4 are fixed together through epoxy resin adhesive; the first and second half- ring core pieces 1 and 2 constitute an annular magnetic ring having an inner diameter of 160mm, an outer diameter of 220mm, and a thickness of 20 mm. When a partial discharge detection sensor with a large cross section diameter needs to be produced and manufactured, a manufacturer can combine and connect a plurality of magnetic core blocks 4 together according to needs, so that the production and the manufacture of the first half-ring magnetic core piece 1 or the second half-ring magnetic core piece 2 can be completed without a kiloton-level press, the production and the manufacture costs of the partial discharge detection sensor with a large diameter size are reduced, and the problem that the existing sensor of a part of large-size to-be-measured element 3 cannot measure can be solved; in addition, the size and the shape of each magnetic core block 4 on the first semi-ring magnetic core piece 1 and the second semi-ring magnetic core piece 2 are identical in an equal angle equal division mode, so that the magnetic core blocks 4 forming the first semi-ring magnetic core piece 1 and the second semi-ring magnetic core piece 2 can be commonly used, manufacturers can conveniently manufacture the magnetic core blocks 4, and the manufacturing cost of the partial discharge detection sensor is reduced; the resin adhesive is double-component glue, needs AB mixing for use, can be filled in larger gaps, is suitable for general environments, and has the advantages of water resistance, oil resistance, strong acid and alkali resistance. The plurality of core segments 4 can be effectively fixed together firmly and reliably by the epoxy adhesive.
And conducting wires are arranged in the first semi-ring magnetic core piece 1 and the second semi-ring magnetic core piece 2 and are wound by adopting a Rogowski coil structure. The wire transmits signals outwards through the BNC connector, and the transmission signals are data information measured by the partial discharge detection sensor. A BNC connector is a connector for coaxial cables. BNC has the advantages of long transmission distance and stable signal;
a metal shell provided on outer surfaces of the first and second half- ring core pieces 1 and 2; the above-described metal shell can effectively protect the first half-ring core piece 1 and the second half-ring core piece 2 constituted by the core segments 4.
The first semicircular magnetic core piece 1 and the second semicircular magnetic core piece 2 are hinged together and are opened or closed through a buckle structure, one end of the first semicircular magnetic core piece 1 is connected with one end of the second semicircular magnetic core piece 2 through a hinge shaft pin, and the other end of the first semicircular magnetic core piece 1 is detachably connected through the buckle structure formed by the clamping hook and the clamping groove, so that the partial discharge detection sensor can be arranged around the circumferential direction of the element to be detected 3, and whether the partial discharge phenomenon occurs in the element to be detected 3 such as a cable body, a sleeve and the like is measured.
A method of manufacturing a partial discharge detection sensor, comprising the steps of:
step S1, manufacturing the magnetic core block 4 through ferrite material preparation, blank making, pressing and sintering;
step S2, winding a coil around the magnetic core segment 4 and mounting a lead tab;
a step S3 of fixing a plurality of core segments 4 together to constitute the first half-ring core piece 1 and the second half-ring core piece 2;
step S3, the first half-ring core piece 1 and the second half-ring core piece 2 are joined together.
Through producing magnetic core piecemeal 4 alone, the partial discharge detection sensor is constituteed to a plurality of magnetic core piecemeal 4 to rethread, can reduce its manufacturing cost of major diameter size's partial discharge detection sensor effectively, improves product competitiveness.
Of course, the utility model discloses the application does not do specific restriction to the joint of outside transmission signal on the wire, in other embodiments, the wire passes through TNC and connects outside transmission signal, and above-mentioned transmission signal is the data information that partial discharge detection sensor measured. TNC connectors are variations of BNC connectors that employ threaded connections for connecting coaxial cables in radios and test instruments. TNC connectors have better performance at microwave frequencies than BNC connectors.
Of course, the present invention is not limited to the number of the core segments 4 constituting the first half-ring core member 1 and the second half-ring core member 2, and in other embodiments, the first half-ring core member 1 and the second half-ring core member 2 are respectively constituted by 4 core segments 4.
Of course, the application of the present invention does not specifically limit the number of the magnetic core segments 4 constituting the first half-ring magnetic core piece 1 and the second half-ring magnetic core piece 2, and in other embodiments, the first half-ring magnetic core piece 1 is composed of 8 magnetic core segments 4; the second half-ring core piece 2 is constituted by 4 of the core segments 4.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (9)
1. A partial discharge detection sensor, comprising:
a first half-ring core member (1);
the second semicircular magnetic core piece (2) is arranged corresponding to the first semicircular magnetic core piece (1) and surrounds the circumferential direction of the element to be tested (3);
the first half-ring core piece (1) and/or the second half-ring core piece (2) comprises at least two core segments (4) connected together.
2. The partial discharge detection sensor according to claim 1, wherein an epoxy adhesive is provided between any two of the magnetic core segments (4) for fixing the two together.
3. The partial discharge detection sensor according to claim 1, wherein the first half-ring core piece (1) and the second half-ring core piece (2) are internally provided with a wire that transmits a signal to the outside through a BNC connector or a TNC connector.
4. The partial discharge detection sensor of claim 3 wherein the wire is wound in a Rogowski coil configuration.
5. The partial discharge detection sensor according to any one of claims 1 to 4, wherein at least two of the core segments (4) constituting the first half-ring core member (1) are equal-sized and-shaped halves; and/or at least two of the core segments (4) constituting the second half-ring core piece (2) are equally sized and shaped halves.
6. The partial discharge detection sensor according to claim 5, wherein the first half-ring core piece (1) and the second half-ring core piece (2) are each constituted by at least two core segments (4), each of the core segments (4) being identical in size and shape.
7. The partial discharge detection sensor according to claim 1, wherein the first half-ring core piece (1) and/or the second half-ring core piece (2) is composed of 8 core segments (4); and/or the first half-ring core piece (1) and/or the second half-ring core piece (2) are composed of 4 core segments (4).
8. The partial discharge detection sensor according to claim 1, wherein the first half-ring core piece (1) and the second half-ring core piece (2) are provided with a metal shell on outer surfaces thereof.
9. The partial discharge detection sensor according to claim 1, wherein the first half-ring core piece (1) and the second half-ring core piece (2) are hinged together, opened or closed by a snap-fit structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921177091.0U CN210534264U (en) | 2019-07-24 | 2019-07-24 | Partial discharge detection sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921177091.0U CN210534264U (en) | 2019-07-24 | 2019-07-24 | Partial discharge detection sensor |
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| CN210534264U true CN210534264U (en) | 2020-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376495A (en) * | 2019-07-24 | 2019-10-25 | 全球能源互联网研究院有限公司 | A kind of partial discharge detecting sensor and its manufacturing method |
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- 2019-07-24 CN CN201921177091.0U patent/CN210534264U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376495A (en) * | 2019-07-24 | 2019-10-25 | 全球能源互联网研究院有限公司 | A kind of partial discharge detecting sensor and its manufacturing method |
| WO2021013249A1 (en) * | 2019-07-24 | 2021-01-28 | 全球能源互联网研究院有限公司 | Partial discharge detection sensor and manufacturing method therefor |
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