CN114905438B - Conductor positioning device for leakage transformer and leakage detection equipment - Google Patents
Conductor positioning device for leakage transformer and leakage detection equipment Download PDFInfo
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- CN114905438B CN114905438B CN202210626366.4A CN202210626366A CN114905438B CN 114905438 B CN114905438 B CN 114905438B CN 202210626366 A CN202210626366 A CN 202210626366A CN 114905438 B CN114905438 B CN 114905438B
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- 239000004020 conductor Substances 0.000 title claims abstract description 110
- 238000001514 detection method Methods 0.000 title claims description 18
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000011900 installation process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000000452 restraining effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The present disclosure relates to a conductor positioning device (1) for a leakage transformer (2) and a related leakage protection apparatus. The conductor positioning device (1) comprises: a stopper for mounting on a first hole (21) of the earth leakage protection device and defining a second hole (41, 51, 61) allowing the conductor to be detected to pass therethrough; wherein the second aperture is defined within the area covered by the first aperture. In particular, when the stop is mounted on the first hole (21), the second hole is positioned in a circular area of diameter D/2 centered on the center of the first hole (21), where D is the diameter of the first hole (21). By utilizing the conductor positioning device (1) and the related leakage protection equipment, the measurement precision and the anti-interference capability of the conductor positioning device can be effectively improved.
Description
Technical Field
The present disclosure relates to the field of leakage detection, and more particularly to a conductor positioning device for a leakage transformer and a leakage detection apparatus.
Background
Leakage transformers (also known as zero sequence transformers) are widely used in industrial and domestic applications for fault detection of electrical leakage.
Typically, the leakage transformer is a single-turn through type current transformer, and the working principle is as follows: allowing a three-phase cable to be detected to pass through a window hole of a core on a mutual inductor as a primary side line, wherein under normal conditions, three-phase currents in the primary side line are basically balanced, and the generated composite magnetic flux is also close to zero; when an electric shock or an electric leakage fault occurs in the primary side line, the generated composite magnetic flux is not equal to zero, so that zero sequence current can be output on the secondary side of the transformer, and the protection action (power supply cutting, alarm and the like) of equipment connected to the primary side line can be further enabled, so that the electric leakage or fault protection function is realized.
Disclosure of Invention
One of the purposes of the present disclosure is to provide a conductor positioning device for a leakage transformer, which can effectively improve the detection precision and/or the anti-interference capability of the leakage transformer.
According to a first aspect of the present disclosure, there is provided a conductor positioning apparatus for a leakage transformer having a first hole allowing a conductor to be detected to pass therethrough, the conductor positioning apparatus comprising: a stop for mounting over the first aperture and defining a second aperture allowing the conductor to pass therethrough; wherein the second aperture is defined within the area covered by the first aperture.
It is readily appreciated that with the conductor positioning apparatus of the present disclosure, the position of the conductor to be detected in the magnetic field environment within the first bore may be limited, which may facilitate the conductor to be detected being in a relatively more evenly distributed or uniform magnetic field environment, which may facilitate improved detection accuracy and/or interference rejection capability of the leakage transformer.
In some embodiments, when the stop is mounted on the first bore, the second bore is positioned within a circular region of diameter D/2 centered on the center of the first bore, where D is the diameter of the first bore. In this way, the conductor to be detected can be further subjected to a substantially uniform magnetic field environment, thereby further improving the detection accuracy and/or the anti-interference capability of the leakage transformer.
In some embodiments, when the stop is mounted on the first aperture, the center of the second aperture and the center of the first aperture coincide. In this way, the conductor to be detected can be brought to a position intermediate the first holes. It will be readily appreciated that the magnetic field environment is relatively evenly distributed and uniform at the intermediate position of the first aperture.
In some embodiments, the stop is formed by a combination of a first stop and a second stop, the first stop and the second stop being adapted to be mounted to the first bore from two opposite sides of the first bore, respectively. In this way, the convenience of mounting the stopper is improved.
In some embodiments, the first and second retainers each have an annular portion and an outer flange extending from the annular portions, the annular portions collectively defining the second bore, wherein the annular portion has an outer diameter equal to the diameter of the first bore, the annular portion has an inner diameter equal to the diameter of the second bore, and the outer flange has an outer diameter greater than the diameter of the first bore. In these embodiments, the first and second retainers may be better positioned over the first bore by the design of the collar and outer flange.
In some embodiments, the first and second stop are both identical in shape and are adapted to be fastened to one another by a screw connection. In this way, both the first stopper and the second stopper can be fixed easily.
In some embodiments, the first stop and the second stop are each formed from two halves. In this way, the ease of installation of the first and second stoppers can be further improved.
In some embodiments, the stop has a hollow shaft portion having an outer diameter equal to the diameter of the first bore and two resilient flange portions extending from opposite ends of the hollow shaft portion, an inner diameter of the hollow shaft portion defining the second bore, the resilient flange portions having an outer diameter greater than the diameter of the first bore; wherein the resilient flange portion is designed to allow passage from one side of the first aperture to the other side of the first aperture in the event of deformation thereof. It will be readily appreciated that this embodiment provides another type of stop. With this type of stop, it is likewise possible to conveniently mount the stop on the first hole.
In some embodiments, the limiter has a slot in a lateral direction configured to pass from a radial end of the flange portion to an inner surface of the hollow shaft portion and allow the conductor to pass laterally through the slot into the second bore. In this way, the conductor can be conveniently mounted to the second aperture of the limiter.
In some embodiments, the stop is an integrally formed elastomer.
In some embodiments, the retainer is a hard ring having an inner diameter equal to the diameter of the second bore and an outer diameter equal to or less than the diameter of the first bore to allow the hard ring to be directly inserted into the first bore in an axial direction of the first bore. It will be readily appreciated that this embodiment provides yet another type of stop. With this type of stop, it is likewise convenient to mount the stop on the first hole.
In some embodiments, the conductor positioning apparatus further comprises a shield for fitting over the exterior of the leakage transformer to shield external magnetic field interference, the shield comprising the first and second shields shaped in combination with each other, the first and second shields in combination defining a third aperture, an edge of the third aperture being adapted to laterally abut and support the rigid collar so that the rigid collar stabilizes on the first aperture. In this way, not only can the leakage transformer be provided with magnetic field shielding, but also a stable support can be provided for the limiting member.
According to a second aspect of the present disclosure, there is provided an electrical leakage detection apparatus. The leakage detection device includes: a leakage transformer having a first hole allowing a conductor to be detected to pass therethrough; and a conductor positioning device according to the first aspect.
It should also be appreciated that the descriptions in this summary are not intended to limit key or critical features of embodiments of the disclosure, nor are they intended to limit the scope of the disclosure. Other features of embodiments of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, wherein like or similar reference numerals denote like or similar elements, in which:
Fig. 1 shows a schematic view of a conductor positioning device mounted on a leakage transformer according to a first example embodiment of the present disclosure;
fig. 2 shows an exploded schematic view of a conductor positioning device in connection with a leakage transformer of a first example embodiment of the present disclosure;
Fig. 3 shows a schematic view of a conductor positioning device mounted on a leakage transformer according to a second example embodiment of the present disclosure;
Fig. 4 shows an exploded schematic view of a conductor positioning device in connection with a leakage transformer according to a second example embodiment of the present disclosure;
fig. 5 shows a schematic view of a conductor positioning device mounted on a leakage transformer according to a third example embodiment of the present disclosure; and
Fig. 6 shows an exploded schematic view of a conductor positioning device according to a third example embodiment of the present disclosure, together with a leakage transformer.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
As described previously, leakage transformers (or zero sequence transformers) are widely used in industrial and domestic applications for fault detection of leakage and the like. In particular, the measurement accuracy of the leakage transformer is critical. However, the inventors noted that: in some conventional designs, the manufacturing materials and manufacturing processes of the leakage transformers have a large impact on the magnetic field distribution within their core aperture, which results in the measurement accuracy of the leakage transformers being even affected by the placement of conductors (such as cables) as they pass through the aperture of the leakage transformer.
In order to reduce this effect and to improve the measurement accuracy of various types of leakage transformers as much as possible, the inventors have realized that: it may be beneficial to limit the conductor to be detected, such as a cable, to a localized area within the core aperture of the leakage transformer, particularly a circular area centered about the center of the core aperture, having a diameter not exceeding 1/2 the diameter of the first aperture of the leakage transformer, as it may provide a more uniform magnetic field environment for the conductor to be detected, such as a cable.
To this end, the idea of the present disclosure is to provide a conductor positioning device for a leakage transformer, which may in particular comprise the following limiting members: the limiter may be configured such that, when the limiter is mounted on the first aperture of the leakage transformer, a second aperture defined by the limiter for allowing a conductor to be tested (such as a cable) to pass therethrough may be positioned within an area covered by the first aperture of the leakage transformer. Further, the coverage area of the second hole is smaller than the coverage area of the first hole. In particular, the second hole may be positioned within a circular area of diameter D/2 centered around the center of the first hole of the leakage transformer, where D is the diameter of the first hole. It is easy to understand that in this arrangement, the arrangement position of the conductor (such as a cable) on the leakage transformer is limited, which helps to improve the measurement accuracy of the different types of leakage transformers.
To better understand the above concepts, fig. 1 shows a schematic view of a conductor positioning device mounted on a leakage transformer according to a first example embodiment of the present disclosure; and fig. 2 shows an exploded schematic view of a conductor positioning device of a first example embodiment of the present disclosure, along with a leakage transformer.
As shown in fig. 1 and 2, the conductor positioning device 1 comprises a stop 4 adapted to be mounted on a first hole 21 of the leakage transformer 2, while the stop 4 itself also defines a second hole 41. It will be readily appreciated that both the first and second holes 21, 41 described above may allow a conductor to be tested (such as a cable) 3 to pass therethrough, and that in the mounted state of the limiter 4, the second hole 41 will be positioned within the area covered by the first hole 21. It will be readily appreciated that this may constrain the position of the conductors within the first bore 21, which helps promote consistency in the magnetic field environment in which the plurality of conductors (such as cables) are passed.
By way of example only, the conductor 3 to be detected shown in fig. 1 is a three-phase four-wire cable. However, it will be appreciated that the present disclosure is not limited to the type, number, or number of different phase conductors. For example, the conductors may be cables, and the cables may be, for example, three-phase five-wire cables, single-phase two-wire cables (neutral + hot), even a single neutral N, etc. Further, the conductor may be, for example, a copper bar or the like other than the cable. As will be appreciated by those skilled in the art, the principle of the leakage transformer 2 is intended to measure zero sequence current (i.e. unbalance current) on the conductor 3, so long as the number of conductors and the number of different phases are arranged to be suitable for determining whether the conductor is leaking based on the detection principle of the leakage detector.
It is also easy to understand that once the zero sequence current is measured, which means that the conductor 3 as primary side line may be subjected to an electric shock or leakage fault, the protection action (cutting off the power supply, alarm, etc.) can be activated for the device interfacing on the conductor 3.
In particular, as previously discussed, the diameter of the second bore 41 may also be defined to be less than 1/2 of the diameter D of the first bore 21. It will be readily appreciated that in the manner described above, it is possible to advantageously constrain the position of the conductors within the first aperture and in particular allow to ensure that the plurality of conductors 3 are in a substantially uniform magnetic field environment as they pass from both of their apertures.
As an example, in the mounted state of the limiter 4, it may be more advantageous to define the second hole 41 in a circular area centered on the center of the first hole 21 and having a diameter of 1/2 of the diameter D of the first hole, since it may be easier to ensure that the plurality of conductors 3 are in a substantially uniform magnetic field environment when the second hole 41 is so positioned, thereby providing a higher measurement accuracy. As a further example, when the stop is mounted on the first bore, the center of the second bore may be exactly coincident with the center of the first bore, thereby providing a more substantially uniform magnetic field environment for the plurality of conductors 3.
In this embodiment, in order to achieve convenient installation of the limiting member 4 on the first hole 21, as shown in fig. 2, the limiting member 4 may further include a first limiting member 42 and a second limiting member 43, which may be combined to form the limiting member 4 and the second hole 41. In some embodiments, both the first stop 42 and the second stop 43 are identical in structure and shape to one another. In still other embodiments, both the first stop 42 and the second stop 43 may be different in structure and shape from one another.
Further, the first stopper 42 and the second stopper 43 may be configured to be adapted to be mounted to the first hole 21 from two opposite sides of the first hole 21, respectively.
In some embodiments, the first stop 42 and the second stop 43 may each have an annular portion 44 and an outer flange 45 extending from the annular portion 44, wherein the annular portion 44 may have an outer diameter equal to the diameter of the first bore 21, the annular portion 44 may have an inner diameter equal to the diameter of the second bore, and the outer flange 45 may have an outer diameter greater than the diameter of the first bore. In this way, when the first and second stop members 42, 43 are assembled, the annular portion 44 will be adapted to extend into the first bore 21, while the outer flange 45 will act as a stop, i.e., prevent the stop members from further penetration into the first bore 21.
Further, as an example, both the first stopper 42 and the second stopper 43 may be fixed to each other in a snap-fit manner. As another example, both the first stopper 42 and the second stopper 43 may be fastened to each other by screw connection. In these ways, in assembling these components, the operator may achieve this by first passing the conductor 3 through one of the first stopper 42 and the second stopper 43, the first hole 21 of the leakage transformer 2, the other of the first stopper 42 and the second stopper 43, and then mounting the first stopper 42 and the second stopper 43 to the first hole 21 from both the left and right sides of the leakage transformer 2.
In some embodiments, the first stop 42 and the second stop 43 may further each be formed from two halves. This further improves the degree of freedom of design of the stopper 4, as well as the ease of installation. In this way, in assembling these components, the operator can do this by having the conductor 3 first pass through the first hole 21 of the leakage transformer 2 and then assemble the first and second stop members 42, 43, respectively, on the first hole 21.
It will be readily appreciated that the conductor positioning device 1 of fig. 1 and 2 provides a simple way of restraining the conductor 3 to be detected on the first hole 21 of the leakage transformer 2, which improves the detection accuracy of the leakage transformer 2.
Fig. 3 shows a schematic view of a conductor positioning device mounted on a leakage transformer according to a second example embodiment of the present disclosure; and fig. 4 shows an exploded schematic view of a conductor positioning device according to a second example embodiment of the present disclosure, together with a leakage transformer.
As shown in fig. 3 and 4, the conductor positioning device 1 comprises a stop 5 adapted to be mounted on a first hole 21 of the leakage transformer 2. Since the types and the number of the leakage transformers 2 and the conductor positioning apparatuses 1 suitable for detection are the same as those shown in fig. 1, a description thereof will not be repeated. The structure of the stopper 5 will be described with emphasis.
The limiter 5 has a second hole 51, which second hole 51 will be positioned within the area covered by the first hole 21 in the mounted state of the limiter 5. In particular, the diameter of the second hole 51 may be defined to be less than 1/2 of the diameter D of the first hole 21. It will be readily appreciated that in this way it is possible to allow the plurality of conductors 3 to be ensured to be in a substantially uniform magnetic field environment as they pass through both of their apertures.
As an example, in the mounted state of the limiter 5, it may be more advantageous to define the second hole 51 in a circular area centered on the center of the first hole 21 and having a diameter of 1/2 of the diameter D of the first hole, since when the second hole 51 is so positioned, it may be easier to ensure that the plurality of conductors 3 are in a substantially uniform magnetic field environment, thereby providing higher measurement accuracy. As a further example, when the spacing member is mounted on the first hole, the center of the second hole may be exactly coincident with the center of the first hole, thereby providing a more substantially uniform magnetic field environment for the plurality of conductors 3.
According to this embodiment, the stopper 5 has a hollow shaft portion 52 and two elastic flange portions 53 extending from opposite ends of the hollow shaft portion, wherein the outer diameter of the hollow shaft portion 52 is equal to the diameter of the first hole 21, the inner diameter of the hollow shaft portion 52 defines the second hole 51, and the outer diameter of the elastic flange portions 53 is larger than the diameter of the first hole 21. Further, the elastic flange portion 53 may be designed to be elastically deformable to allow one end of the stopper 5 to pass from one side of the first hole 21 to the other side of the first hole 21, thereby achieving the mounting of the stopper 5 on the first hole 21 on the leakage transformer 2. In this way, the assembly of the stopper can be simplified as compared with the assembly of the first embodiment. In some embodiments, the stop 5 may be integrally formed. However, in still other embodiments, it is also possible that the stop 5 is not integrally formed. Furthermore, although only the elastic flange portion 53 is described as being elastic in the above description, in a further embodiment, it is also possible to construct the entirety of the stopper 5 as one piece and as one piece elastic, and this manner may be more preferable because the elastic hollow shaft portion can more conveniently facilitate the passage of one end of the stopper 5 through the first hole 21.
To further facilitate the mounting of the stop 5 on the first bore 21, in some embodiments the stop 5 may also have a slot 54 in the lateral direction, said slot 54 being configured to pass from the radial extremity of the flange portion to the inner surface of the hollow shaft portion 52. In this way, when the stopper 5 is entirely elastic, the hollow shaft portion itself of the stopper 5 can be deformed more easily, thereby facilitating the mounting of the stopper 5 on the first hole 21 more easily. Furthermore, whether or not the hollow shaft portion 52 of the stopper 5 is elastic, a sufficiently large slot may also allow the conductor to enter into the second hole from the lateral direction via the slot 54, which improves the convenience of the conductor mounting to the second hole 51.
At the time of assembly, an operator may first pass the conductor 3 through the first hole 21 of the leakage transformer 2 and the second hole 51 of the limiting member 5, and then mount the limiting member 5 to the first hole 21 of the leakage transformer 2, so as to realize the limiting mounting of the conductor on the first hole 21 of the leakage transformer 2.
It will be readily appreciated that the conductor positioning device 1 of fig. 3 and 4 provides a further simple way of restraining the conductor 3 on the first hole 21 of the leakage transformer 2, which improves the detection accuracy of the leakage transformer 2.
Fig. 5 shows a schematic view of a conductor positioning device mounted on a leakage transformer according to a third example embodiment of the present disclosure; and fig. 6 shows an exploded schematic view of a conductor positioning device according to a third example embodiment of the present disclosure, together with a leakage transformer.
As shown in fig. 5 and 6, the conductor positioning device 1 comprises a stop 6 adapted to be mounted on a first hole 21 of the leakage transformer 2. Since the types and the number of the leakage transformers 2 and the conductors 3 suitable for detection are the same as those shown in fig. 1, a description thereof will not be repeated. The structure of the stopper 6 will be described with emphasis.
As shown in fig. 6, the stopper 6 may be a hard ring-shaped member and defines a second hole 61. Depending on the design, the hard ring may have an inner diameter equal to the diameter of the second bore and an outer diameter equal to or smaller than the diameter D of the first bore 21. When in the mounted state of the limiter 5, the second hole 61 will be positioned within the area covered by the first hole 21. In particular, the diameter of the second hole 61 may be defined to be less than 1/2 of the diameter D of the first hole 21. It will be readily appreciated that in this way it is possible to allow the plurality of conductors 3 to be ensured to be in a substantially uniform magnetic field environment as they pass through both of their apertures.
As an example, in the mounted state of the limiter 6, it may be more advantageous to define the second hole 61 in a circular area centered on the center of the first hole 21 and having a diameter of 1/2 of the diameter D of the first hole, since it may be easier to ensure that the plurality of conductors 3 are in a substantially uniform magnetic field environment when the second hole 61 is so positioned, thereby providing higher measurement accuracy. As a further example, when the spacing member is mounted on the first hole, the center of the second hole may be exactly coincident with the center of the first hole, thereby providing a more substantially uniform magnetic field environment for the plurality of conductors 3.
In some embodiments, the stop 6 may be integrally formed. In still other embodiments, the stop 6 may be formed from two halves. It will be readily appreciated that either form may allow the retainer 6 as a rigid ring to be fitted directly into the first bore 21 in the axial direction of the first bore 21. However, in the above-described manner, the stability of the stopper 6 in the first hole 21 may be deficient.
To further fasten the stop 6 to the first hole 21, this may be achieved in some embodiments, for example, by a shield 7 that is fitted over the exterior of the leakage transformer 2 to shield the external magnetic field from interference.
Specifically, in some embodiments, the shield 7 may include a first shield 71 and a second shield 72 shaped in combination with each other. As an example, the first shield 71 may be sleeved on the upper portion of the leakage transformer 2, and the second shield 72 may be sleeved on the lower portion of the leakage transformer 2. Both the first shield 71 and the second shield 72 may combine to define a third aperture, the inner diameter of which may be equal to the outer diameter of the limiter 6. Thus, when the first and second shields 71, 72 are mounted, the edge 73 of the third hole can laterally abut against the hard annular member, so that the hard annular member is stably supported on the first hole 21. The first shield 71 and the second shield 72 may be fastened to each other by any fastening means (e.g., snap-fit, screw-type).
In some embodiments, the shield 7 may be made of a magnetically conductive or non-conductive metallic material, such as steel, aluminum, copper, or the like.
Note that although the shield case 7 is described above as being used to fasten the stopper 6, in other embodiments, it is also possible that the shield case 7 is used only to shield the leakage transformer from external disturbances.
The process of assembling the respective components on the leakage transformer 2 will be described below only with a shield case 7 having a function of fastening the stopper 6. Specifically, for example, in the embodiment for the stopper 6 as the hard ring member formed integrally, the conductor 3 may be first passed through the first hole 21 of the leakage transformer 2 and the second hole 61 of the hard ring member, then the hard ring member is directly inserted into the first hole 21, and finally the first shield 71 and the second shield 72 are mounted on the leakage transformer 2 while supporting and stopping the edges of the hard ring member. For another example, in the embodiment for a hard ring shaped piece formed of two halves, the conductor 3 may be first passed through the first hole 21 of the leakage transformer 2, then the two halves of the hard ring are directly plugged into the first hole 21, and finally the first and second shields 71, 72 are mounted on the leakage transformer 2, thereby simultaneously supporting and limiting the edges of the hard ring.
It will be readily appreciated that the conductor positioning device 1 of fig. 5 and 6 provides a further simple way of restraining the conductor 3 on the first hole 21 of the leakage transformer 2, which improves the detection accuracy of the leakage transformer 2.
Various embodiments of the conductor positioning apparatus of the present disclosure and its corresponding installation process have been described in detail above. It should be understood that the structure and installation process of the conductor positioning apparatus described above is merely an example. Furthermore, in addition to the above-mentioned conductor positioning arrangement intended for protection, the subject matter of the present disclosure may also relate to a leakage protection device, which may comprise the above-mentioned conductor positioning arrangement.
It should also be appreciated that while the description describes the installation processes in a particular order, this does not require or imply that the installation processes must be performed in that particular order or that all of the illustrated installation operations must be performed in order to achieve desirable results, but rather that the depicted installation processes may be capable of changing the order of execution. Additionally or alternatively, certain operational steps may be omitted, multiple operational steps combined into one operational step to be performed, and/or one operational step decomposed into multiple operational steps to be performed.
It is also to be understood that while the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. For example, the embodiments of the various embodiments described above or features in the embodiments may be arbitrarily combined by a person skilled in the art, as long as the embodiments or features are suitable for combination. For another example, a shield case for shielding external magnetic field interference may also be applied to the first and second embodiments of the present disclosure.
In the claims, the word "comprising" does not exclude other elements, and the indefinite article "a" or "an" does not exclude a plurality. A single element or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain features are recited in mutually different embodiments or in dependent claims does not indicate that a combination of these features cannot be used to advantage. The scope of the application encompasses any possible combination of the features recited in the various embodiments or the dependent claims without departing from the spirit and scope of the present application.
Furthermore, any reference signs in the claims shall not be construed as limiting the scope of the invention.
Claims (13)
1. A conductor positioning device (1) for a leakage transformer (2), the leakage transformer (2) having a first hole (21) allowing a conductor to be detected to pass therethrough, the conductor positioning device (1) comprising:
A stop for mounting on the first aperture (21) and defining a second aperture allowing the conductor to pass therethrough;
wherein the second aperture is defined within the area covered by the first aperture;
wherein when the limiting member is mounted on the first hole (21), the second hole is positioned in a circular area with a diameter of D/2 around the center of the first hole (21), wherein D is the diameter of the first hole (21);
Wherein the limiting member (4) is formed by a combination of a first limiting member (42) and a second limiting member (43) adapted to be mounted to the first hole (21) from two opposite sides of the first hole (21), respectively.
2. Conductor positioning apparatus (1) according to claim 1, wherein the centre of the second hole coincides with the centre of the first hole (21) when the limiter is mounted on the first hole (21).
3. Conductor positioning device (1) according to claim 1, wherein the first and second stop (42, 43) each have a ring-shaped portion (44) and an outer flange (45) extending from the ring-shaped portion, both ring-shaped portions together defining the second aperture,
Wherein the annular portion (44) has an outer diameter equal to the diameter of the first bore (21), an inner diameter equal to the diameter of the second bore, and the outer diameter of the outer flange (45) is greater than the diameter of the first bore (21).
4. A conductor positioning apparatus (1) according to claim 3, wherein the first and second stop (42, 43) are both identical in shape and adapted to be fastened to each other by means of a screw connection.
5. The conductor positioning apparatus (1) according to any of claims 3 to 4, wherein the first stop (42) and the second stop (43) are each composed of two halves.
6. A conductor positioning device (1) for a leakage transformer (2), the leakage transformer (2) having a first hole (21) allowing a conductor to be detected to pass therethrough, the conductor positioning device (1) comprising:
A stop for mounting on the first aperture (21) and defining a second aperture allowing the conductor to pass therethrough;
wherein the second aperture is defined within the area covered by the first aperture;
wherein when the limiting member is mounted on the first hole (21), the second hole is positioned in a circular area with a diameter of D/2 around the center of the first hole (21), wherein D is the diameter of the first hole (21),
Wherein the stopper (5) has a hollow shaft portion (52) and two elastic flange portions (53) extending from opposite ends of the hollow shaft portion, an outer diameter of the hollow shaft portion (52) being equal to a diameter of the first hole (21), an inner diameter of the hollow shaft portion defining the second hole, an outer diameter of the elastic flange portions (53) being larger than the diameter of the first hole (21);
Wherein the resilient flange portion (53) is designed to allow passage from one side of the first aperture (21) to the other side of the first aperture (21) with deformation thereof.
7. The conductor positioning apparatus (1) according to claim 6, wherein a center of the second hole coincides with a center of the first hole (21) when the stopper is mounted on the first hole (21).
8. The conductor positioning device (1) according to claim 6 or 7, the stopper (5) having a slot (54) in a lateral direction, the slot (54) being configured to penetrate from a radial end of the elastic flange portion (53) to an inner surface of the hollow shaft portion (52) and to allow the conductor to enter into the second hole (51) from a lateral direction via the slot (54).
9. Conductor positioning device (1) according to claim 6 or 7, the stop (5) being an integrally formed elastomer.
10. A conductor positioning device (1) for a leakage transformer (2), the leakage transformer (2) having a first hole (21) allowing a conductor to be detected to pass therethrough, the conductor positioning device (1) comprising:
A stop for mounting on the first aperture (21) and defining a second aperture allowing the conductor to pass therethrough;
wherein the second aperture is defined within the area covered by the first aperture;
wherein when the limiting member is mounted on the first hole (21), the second hole is positioned in a circular area with a diameter of D/2 around the center of the first hole (21), wherein D is the diameter of the first hole (21),
Wherein the stopper (6) is a hard annular member having an inner diameter equal to the diameter of the second hole and an outer diameter equal to or smaller than the diameter of the first hole (21) to allow the hard annular member to be directly inserted into the first hole (21) in the axial direction of the first hole (21).
11. Conductor positioning apparatus (1) according to claim 10, wherein the centre of the second hole coincides with the centre of the first hole (21) when the limiter is mounted on the first hole (21).
12. Conductor positioning apparatus (1) according to claim 10 or 11, further comprising a shield (7) for being fitted outside the leakage transformer (2) to shield the external magnetic field from interference,
The shield (7) comprises a first shield (71) and a second shield (72) shaped in combination with each other, the first shield (71) and the second shield (72) in combination defining a third hole, the edge (73) of which is adapted to laterally abut and support the rigid ring so that the rigid ring is stable over the first hole (21).
13. An electric leakage detection apparatus comprising:
a leakage transformer (2) having a first hole (21) allowing a conductor to be detected to pass therethrough; and
Conductor positioning device (1) according to any of claims 1-12.
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| CN202210626366.4A CN114905438B (en) | 2022-06-02 | 2022-06-02 | Conductor positioning device for leakage transformer and leakage detection equipment |
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| CN202210626366.4A CN114905438B (en) | 2022-06-02 | 2022-06-02 | Conductor positioning device for leakage transformer and leakage detection equipment |
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| CN114905438A (en) | 2022-08-16 |
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