Clamp for detecting characteristics of mutual inductor

Abstract

The utility model relates to the technical field of electrical connection devices, in particular to a clamp for mutual inductor characteristic detection. The utility model provides a clamp for detecting the characteristics of a mutual inductor. The clamp comprises a base, an input wiring unit, an output wiring unit and a middle conductor unit. The input wiring unit comprises at least three first wiring conductors. Wherein the three first wiring conductors are respectively used for inputting A-phase power, B-phase power and C-phase power. The output wiring unit comprises at least three second wiring conductors. Wherein the three second wiring conductors are respectively used for outputting A-phase power, B-phase power and C-phase power. The middle conductor unit comprises at least three middle conductors, and the two ends of each middle conductor are detachably connected with the corresponding first wiring conductor and the corresponding second wiring conductor. The clamp for detecting the characteristics of the mutual inductor has the advantage of being convenient to use, and the detection efficiency of the zero-sequence mutual inductor can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical connection devices, in particular to a clamp for mutual inductor characteristic detection. BACKGROUND

[0002] In an ideal three-phase balanced system, the three-phase currents cancel each other out and the total sum is zero. However, when the system is asymmetric, zero sequence currents are generated.

[0003] A zero sequence mutual inductor is used to monitor these zero sequence currents and convert them into measurable signals, which are provided to the line board of the product (e.g., a circuit breaker), which compares the received signals with a threshold value to take timely measures.

[0004] In practice, it is found that when the zero sequence mutual inductor works under a large current condition, the zero sequence mutual inductor will be disturbed, thereby generating signals that may cause misoperation of the product (e.g., a circuit breaker).

[0005] In this case, it is necessary to detect the anti-interference characteristics of the zero sequence mutual inductor under a large current condition.

[0006] Currently, for the detection of the anti-interference characteristics of the zero sequence mutual inductor, the zero sequence mutual inductor needs to be installed in the applied product and then connected to the test circuit for evaluation.

[0007] The defect of this detection structure is that the anti-interference detection of the zero sequence mutual inductor needs to be installed in cooperation with the corresponding product, and the installation of the zero sequence mutual inductor in the product is relatively complex, so it is inconvenient to improve the detection efficiency. CONTENT OF THE INVENTION

[0008] The utility model aims at providing a clamp for mutual inductor characteristic detection, which can conveniently install the zero sequence mutual inductor and help improve the detection efficiency of the anti-interference characteristics of the zero sequence mutual inductor.

[0009] The technical solution of the utility model is as follows:

[0010] The clamp for mutual inductor characteristic detection provided by the present application comprises a base, an input wiring unit, an output wiring unit and an intermediate conductor unit.

[0011] The base is provided with a first mounting area, a second mounting area and a third mounting area, and the second mounting area is used for mounting the zero sequence mutual inductor.

[0012] The input wiring unit is arranged in the first mounting area, and the input wiring unit comprises at least three first wiring conductors. The three first wiring conductors are respectively used for inputting A-phase electricity, B-phase electricity and C-phase electricity.

[0013] The output wiring unit is arranged in the third mounting area, and the output wiring unit includes at least three second wiring conductors.

[0014] The intermediate conductor unit includes at least three intermediate conductors, each of which can pass through the opening of the zero sequence transformer and the two ends of which are located outside the opening, and the two ends of the intermediate conductors are detachably connected with the corresponding first wiring conductors and second wiring conductors.

[0015] The clamp for transformer characteristic detection provided in the application can be used for clamping when detecting the anti-interference characteristic of the zero sequence transformer, and only two steps are required for mounting the transformer when detecting the anti-interference characteristic of the transformer. The first step is to mount the transformer in the second area, and the second step is to pass the intermediate conductors through the opening of the zero sequence transformer and detachably connect the two ends of the intermediate conductors with the corresponding first wiring conductors and second wiring conductors. Thus, the clamping of the transformer is realized, and therefore, the clamp for transformer characteristic detection provided in the application has the characteristics of convenient use, which helps to improve the detection efficiency of the zero sequence transformer.

[0016] In a possible design, when the zero sequence transformer is mounted in the second mounting area, the central axis of the zero sequence transformer is parallel to the first direction.

[0017] One of the intermediate conductors in the intermediate conductor unit is a first conductor, and the other intermediate conductor in the intermediate conductor unit is a second conductor. The first conductor is used to pass through the A-phase electric current, and the second conductor is used to pass through the C-phase electric current.

[0018] The two ends of the first conductor and the second conductor are provided with first adjusting structures, and the first adjusting structures are used to adjust the positions of the first conductor and the second conductor in the second direction. The first conductor and the second conductor are detachably connected with the corresponding first wiring conductors and second wiring conductors through the first adjusting structures at the two ends.

[0019] The first direction is perpendicular to the second direction, and both the first direction and the second direction are parallel to the plane on which the base is located.

[0020] Based on the clamp for transformer characteristic detection provided in the embodiment, the two ends of the first conductor and the second conductor are provided with first adjusting structures, and the first adjusting structures are used to adjust the positions of the first conductor and the second conductor in the second direction. Thus, when detecting the characteristics of the zero sequence transformer, the output of the zero sequence transformer can be observed by adjusting the positions of the first conductor and the second conductor in the second direction, and the positions of the first conductor and the second conductor in the second direction that are conducive to the stable operation of the zero sequence transformer can be found out.

[0021] When the zero sequence transformer is used in a product, the installation of the zero sequence transformer can be performed by referring to the advantageous position of the first conductor and the second conductor in the second direction obtained during the characteristic detection, so that the working stability of the zero sequence transformer can be improved, and the probability of misoperation of the zero sequence transformer can be reduced.

[0022] In a possible design, the first wiring conductor includes a first vertical part, and the second wiring conductor includes a second vertical part, and the first vertical part and the second vertical part both extend along a third direction.

[0023] The first vertical part and the second vertical part are both provided with a second adjusting structure, and the second adjusting structure is used to adjust the position of the corresponding first conductor and second conductor in the third direction.

[0024] The third direction is perpendicular to the first direction and perpendicular to the second direction.

[0025] Based on the clamp for characteristic detection of a transformer provided in this embodiment, when the zero sequence transformer is tested, the output of the zero sequence transformer can be observed by adjusting the position of the first conductor and the second conductor in the third direction, and the position of the first conductor and the second conductor in the third direction that is advantageous for stable working of the zero sequence transformer can be found out.

[0026] When the zero sequence transformer is used in a product, the installation of the zero sequence transformer can be performed by referring to the advantageous position of the first conductor and the second conductor in the third direction obtained during the characteristic detection, so that the working stability of the zero sequence transformer can be improved, and the probability of misoperation of the zero sequence transformer can be reduced.

[0027] In a possible design, the other intermediate conductor in the intermediate conductor unit is a third conductor, and the third conductor is used to pass through B-phase electricity.

[0028] The two ends of the third conductor are respectively provided with a third adjusting structure, the third adjusting structure is used to adjust the position of the third conductor in the third direction, and the third conductor is detachably connected to the corresponding first wiring conductor and second wiring conductor through the third adjusting structures at the two ends.

[0029] Based on the clamp for characteristic detection of a transformer provided in this embodiment, the output of the zero sequence transformer can be observed by adjusting the position of the third conductor in the third direction, and the position of the third conductor in the third direction that is advantageous for stable working of the zero sequence transformer can be found out.

[0030] When the zero sequence transformer is used in a product, the installation of the zero sequence transformer can be performed by referring to the advantageous position of the third conductor in the third direction obtained during the characteristic detection, so that the working stability of the zero sequence transformer can be improved, and the probability of misoperation of the zero sequence transformer can be reduced.

[0031] In a possible design, at least one of the first adjusting structure, the second adjusting structure and the third adjusting structure is a slot.

[0032] Based on the clamp for transformer characteristic detection provided in the embodiment, the position of the intermediate conductor can be adjusted through the slot, and the slot has the characteristics of simple structure and easy setting.

[0033] In a possible design, the first wiring conductor comprises a first horizontal part connected with the first vertical part.

[0034] The first horizontal part is fixed to the first mounting area and is used for electrical connection with an external connection line.

[0035] The clamp for transformer characteristic detection further comprises a plurality of first insulation barriers, and the first insulation barriers are arranged between adjacent first horizontal parts.

[0036] And / or, the second wiring conductor comprises a second horizontal part connected with the second vertical part.

[0037] The second horizontal part is fixed to the third mounting area and is used for electrical connection with an external connection line.

[0038] The clamp for transformer characteristic detection further comprises a plurality of second insulation barriers, and the second insulation barriers are arranged between adjacent second horizontal parts.

[0039] Based on the clamp for transformer characteristic detection provided in the embodiment, the first insulation barriers arranged between adjacent first horizontal parts can play the role of phase-to-phase insulation, so that the arc is difficult to break through the phase-to-phase insulation, and the safety of the test is ensured. In addition, by arranging the first insulation barriers between adjacent first horizontal parts, the first insulation barriers can play the role of positioning for the installation of the first wiring conductor.

[0040] Based on similar reasons, based on the clamp for transformer characteristic detection provided in the embodiment, by arranging the second insulation barriers between the second horizontal parts, the second insulation barriers can also play the roles of phase-to-phase insulation and positioning.

[0041] In a possible design, another intermediate conductor in the intermediate conductor unit is a fourth conductor, and the fourth conductor is used for passing N-phase current.

[0042] The fourth conductor is detachably connected with the corresponding first wiring conductor and the second wiring conductor.

[0043] Based on the clamp for transformer characteristic detection provided in the embodiment, another intermediate conductor in the intermediate conductor unit is a fourth conductor, and the fourth conductor is used for passing N-phase current, so that the detection of the anti-interference characteristic of the zero sequence transformer can be met when the power supply of a product (such as a residual current circuit breaker) is in a star connection mode.

[0044] In a possible design, along the first direction, the first mounting area and the third mounting area are located at opposite sides of the second mounting area.

[0045] Along the second direction, the plurality of first wiring conductors in the input wiring unit are arranged in sequence at the first mounting area. The plurality of second wiring conductors in the output wiring unit are arranged in sequence at the third mounting area.

[0046] Along the first direction, the first wiring conductors and the second wiring conductors are arranged in one-to-one correspondence.

[0047] The first direction is perpendicular to the second direction, and both the first direction and the second direction are parallel to the plane on which the base is located.

[0048] Based on the clamp for transformer characteristic detection provided in this embodiment, the overall structure of the detection clamp is relatively regular and symmetrical, so that the clamp for transformer characteristic detection is convenient to manufacture. In addition, the installation of the zero sequence transformer and the intermediate conductor is also convenient.

[0049] In a possible design, the intermediate conductor includes a first conductive part, a second conductive part, and a third conductive part.

[0050] The first conductive part and the third conductive part are located at opposite ends of the extension direction of the second conductive part, the extension directions of the first conductive part and the third conductive part are both perpendicular to the extension direction of the second conductive part, and the first conductive part and the third conductive part extend toward the same side of the second conductive part.

[0051] Based on the clamp for transformer characteristic detection provided in this embodiment, the intermediate conductor has a substantially U-shaped structure, which is convenient to install. In addition, the extension direction of the linear hole on the intermediate conductor of this structure can be the same as the extension direction of the first conductive part, so that the intermediate conductor of this structure also has the characteristic of being convenient to set the linear hole, thereby facilitating the adjustment of the installation position of the intermediate conductor.

[0052] In a possible design, the first wiring conductors and the second wiring conductors have the same structure. In this way, the installation of the first wiring conductors and the second wiring conductors is convenient, and the assembly efficiency of the detection clamp can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 A detection principle diagram of a zero sequence transformer in the related art is shown.

[0054] Figure 2 A perspective structural schematic diagram of a clamp for transformer characteristic detection provided in an embodiment of the present application is shown.

[0055] Figure 3 A top view of the clamp for transformer characteristic detection is shown. Figure 2

[0056] ​Figure 4 A structure diagram of a first conductor used in the detection clamp provided by the embodiment of the present application.

[0057] Figure 5 A structure diagram of a first wiring conductor used in the detection clamp provided by the embodiment of the present application.

[0058] Figure 6 Another structure diagram of a first wiring conductor used in the detection clamp provided by the embodiment of the present application.

[0059] Figure 7 A structure diagram of a third conductor used in the detection clamp provided by the embodiment of the present application.

[0060] The reference signs in the drawings are as follows:

[0061] 1, base;

[0062] 21, first wiring conductor; 211, first vertical part; 212, second adjusting structure; 213, first horizontal part; 214, round hole;

[0063] 31, second wiring conductor; 311, second vertical part; 312, second horizontal part;

[0064] 41, first conductor; 411, first adjusting structure;

[0065] 42, second conductor;

[0066] 43, third conductor; 431, third adjusting structure;

[0067] 4A, first conductive part; 4B, second conductive part; 4C, third conductive part;

[0068] 51, first insulating barrier; 61, second insulating barrier;

[0069] CT, zero sequence mutual inductor;

[0070] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of terms such as "comprise", "comprises", "comprising", "containing", "contain", "contains", "include", "includes", "including", "have", "has", "having", or the like are intended to be open-ended. That is, the use of these terms indicates the possibility that there are additional similar features or steps other than those described or other constrained embodiments besides the one of particular interest.

[0073] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated in to other embodiments.

[0074] The term "and / or", used herein only means a correlation relationship of the associated objects, which means that there are three relationships, for example, A and / or B, which means that there are A, A and B, and B. In addition, the character " / " herein generally means that the front and rear associated objects are a "or" relationship.

[0075] In addition, the terms "first", "second", and the like in the specification and claims of the application or the above drawings are used to distinguish different objects, and are not used to describe a specific order, which can expressly or implicitly include one or more of the features.

[0076] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, the "connection" or "connection" of the mechanical structure can mean a physical connection, for example, the physical connection can be a fixed connection, for example, the fixed connection through the spacer, for example, the fixed connection through the screw, bolt or other spacer. The physical connection can also be a detachable connection, for example, mutual clamping or clamping connection. The physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0077] The application will be described in detail below.

[0078] Zero sequence transformer overview: in the ideal three-phase balanced system, the three-phase current cancels each other out, and the total is zero. But when the system is asymmetric, zero sequence current will be generated.

[0079] Zero sequence transformers are used to monitor these zero sequence currents, convert them into measurable signals, and provide them to the line board of the product (e.g., a circuit breaker), which compares the received signals with a threshold value to take timely measures.

[0080] In practice, it is found that when the zero sequence transformer works under a large current condition, the zero sequence transformer will be disturbed by some interference, thus generating a signal that can cause a false operation of the product (e.g., a circuit breaker).

[0081] In this case, it is necessary to detect the anti-interference characteristics of the zero sequence transformer under a large current condition.

[0082] In the following, the detection principle of the zero sequence transformer in the related art is described by taking the detection of the zero sequence transformer in a residual current circuit breaker as an example.

[0083] Figure 1 Fig. 1 shows a detection principle diagram of a zero sequence transformer in the related art, please refer to Figure 1 In the related art, when detecting the anti-interference performance of the zero sequence transformer, the zero sequence transformer needs to be installed in the residual current circuit breaker. During detection, the power supply provides a three-phase balanced large current to the residual current circuit breaker, and provides a certain working voltage to the trip control board. During the detection process, the A-phase, B-phase and C-phase currents of the main circuit of the residual current circuit breaker flow through the opening of the zero sequence transformer, the zero sequence transformer outputs an induced electromotive force, and the trip control board compares the induced electromotive force with a preset voltage threshold value to determine whether the residual current circuit breaker is tripped.

[0084] In the above detection process, since the monitoring current of the zero sequence transformer is a three-phase balanced large current, the induced electromotive force output by the zero sequence transformer is not caused by three-phase unbalance. In actual application, the zero sequence transformer will be disturbed by a large current under a certain large current condition, which will cause a false operation of the residual current circuit breaker. Therefore, during the detection process, the maximum working current of the zero sequence transformer that is not affected by the large current can be detected by changing the supply current, to facilitate the subsequent use of the zero sequence transformer.

[0085] The defect of the detection structure is that the anti-interference detection of the zero sequence transformer needs to be installed in cooperation with the corresponding residual current circuit breaker, and the installation of the zero sequence transformer in the residual current circuit breaker is relatively complex, so it is inconvenient to improve the detection efficiency.

[0086] Based on this, the present application provides a clamp for transformer characteristic detection, which can conveniently install the zero sequence transformer and help improve the detection efficiency of the zero sequence transformer.

[0087] Figure 2 Fig. 1 shows a three-dimensional structure schematic diagram of a clamp for transformer characteristic detection provided by an embodiment of the present application, Figure 3 ToFigure 2 a top view of the device.

[0088] Reference is made to Figure 2 and Figure 3 The clamp for detecting characteristics of a mutual inductor provided by the present application comprises a base 1, an input wiring unit, an output wiring unit and an intermediate conductor unit.

[0089] The base 1 is provided with a first mounting area, a second mounting area and a third mounting area, and the second mounting area is used for mounting a zero sequence mutual inductor CT.

[0090] The input wiring unit is arranged in the first mounting area, and the input wiring unit comprises at least three first wiring conductors 21. The three first wiring conductors 21 are respectively used for inputting A-phase power, B-phase power and C-phase power.

[0091] The output wiring unit is arranged in the third mounting area, and the output wiring unit comprises at least three second wiring conductors 31. The three second wiring conductors 31 are respectively used for outputting A-phase power, B-phase power and C-phase power.

[0092] The intermediate conductor unit comprises at least three intermediate conductors, each of which can pass through an opening of the zero sequence mutual inductor CT, and both ends of each intermediate conductor are located outside the opening, and both ends of each intermediate conductor are detachably connected with a corresponding first wiring conductor 21 and a second wiring conductor 31.

[0093] Specifically, when detecting the anti-interference performance of the zero sequence mutual inductor CT, the zero sequence mutual inductor CT needs to be mounted in the second area, and at least three intermediate conductors need to pass through the zero sequence mutual inductor CT, and both ends of each intermediate conductor are located outside the zero sequence mutual inductor CT, and both ends of each intermediate conductor are detachably connected with a corresponding first wiring conductor 21 and a second wiring conductor 31.

[0094] During the detection, an external power source provides a three-phase balanced large current to the intermediate conductor unit through the input wiring unit and the output wiring unit. In this way, there is a three-phase current passing through the opening of the zero sequence mutual inductor CT, so that the use scene of the zero sequence mutual inductor CT can be simulated. During the detection process, the induced electromotive force of the zero sequence mutual inductor CT is measured to determine the anti-interference characteristics of the zero sequence mutual inductor CT.

[0095] As can be seen from the above, the clamp for transformer characteristic detection provided in the application can be used for clamping when the zero sequence transformer CT anti-interference characteristic is detected, and when the anti-interference characteristic of the transformer is detected, the installation of the transformer only needs two steps, the first step is to install the transformer in the second area, and the second step is that the intermediate conductor passes through the opening of the zero sequence transformer CT, and the two ends of the intermediate conductor are detachably connected with the corresponding first wiring conductor 21 and second wiring conductor 31, so that the clamping of the transformer is realized, therefore, the clamp for transformer characteristic detection provided in the application has the characteristics of convenient use, and helps to improve the detection efficiency of the zero sequence transformer CT.

[0096] In addition, in the related art, when the anti-interference characteristic of the zero sequence transformer CT is detected, a trip control board is used, and the external power supply not only needs to provide a three-phase balanced large current to the residual current circuit breaker, but also needs to provide a working voltage to the trip control board, so that the realization difficulty of the external power supply is large, thereby increasing the detection difficulty of the anti-interference characteristic of the zero sequence transformer CT.

[0097] When the zero sequence transformer CT is detected by the clamp for transformer characteristic detection of the application, the trip control board is not needed. Therefore, the external power supply only needs to provide a three-phase balanced large current to the intermediate conductor unit, and does not need to provide a working voltage to the trip control board, so that the difficulty of power supply of the external power supply is reduced, and the detection difficulty of the anti-interference characteristic of the zero sequence transformer CT is further reduced.

[0098] It should be noted that in the application, "the two ends of the intermediate conductor are detachably connected with the corresponding first wiring conductor 21 and second wiring conductor 31" means that one end of the intermediate conductor for passing through A-phase current is detachably connected with the first wiring conductor 21 for inputting A-phase current, and the other end of the intermediate conductor for passing through A-phase current is detachably connected with the second wiring conductor 31 for outputting A-phase current. One end of the intermediate conductor for passing through B-phase current is detachably connected with the first wiring conductor 21 for inputting B-phase current, and the other end of the intermediate conductor for passing through B-phase current is detachably connected with the second wiring conductor 31 for outputting B-phase current. One end of the intermediate conductor for passing through C-phase current is detachably connected with the first wiring conductor 21 for inputting C-phase current, and the other end of the intermediate conductor for passing through C-phase current is detachably connected with the second wiring conductor 31 for outputting A-phase current.

[0099] It should be further noted that when the zero sequence transformer CT is used in a product, the opening of the zero sequence transformer CT is used for passing through the monitored conductor. The clamp for transformer characteristic detection provided in the application can be used for detecting the ring-shaped zero sequence transformer CT, and can also be used for detecting the runway-shaped zero sequence transformer CT.

[0100] Figure 4A structure diagram of a first conductor used in the detection fixture provided in the embodiments of the present application. Please refer to FIG. 2, Figure 3 With Figure 4 In some embodiments of the present application, when the zero sequence transformer CT is installed in the third installation area, the central axis of the zero sequence transformer CT is parallel to the first direction D1.

[0101] One of the intermediate conductors in the intermediate conductor unit is the first conductor 41, and the other intermediate conductor in the intermediate conductor unit is the second conductor 42. The first conductor 41 is used to pass A-phase electricity, and the second conductor 42 is used to pass C-phase electricity.

[0102] Both ends of the first conductor 41 and the second conductor 42 are provided with a first adjusting structure 411, which is used to adjust the positions of the first conductor 41 and the second conductor 42 in the second direction D2. The first conductor 41 and the second conductor 42 are respectively detachably connected to the corresponding first wiring conductor 21 and second wiring conductor 31 through the first adjusting structure 411 at both ends. The first direction D1 is perpendicular to the second direction D2, and both the first direction D1 and the second direction D2 are parallel to the plane on which the base 1 is located.

[0103] Specifically, as Figure 2 shown, when the zero sequence transformer CT is installed in the third installation area, the central axis of the zero sequence transformer CT is parallel to the first direction D1. The first conductor 41 used to pass A-phase electricity and the second conductor 42 used to pass C-phase electricity both pass through the opening of the zero sequence transformer CT. In practice, it is found that the positions of the first conductor 41 and the second conductor 42 in the second direction D2 will affect the output electromotive force of the zero sequence transformer CT.

[0104] Please continue to refer to Figure 2 With Figure 4 , based on the fixture for zero sequence transformer CT characteristic detection provided in the embodiments, both ends of the first conductor 41 and the second conductor 42 are provided with a first adjusting structure 411, which is used to adjust the positions of the first conductor 41 and the second conductor 42 in the second direction D2. In this way, when the characteristics of the zero sequence transformer CT are detected, the output of the zero sequence transformer CT can be observed by adjusting the positions of the first conductor 41 and the second conductor 42 in the second direction D2, and the positions of the first conductor 41 and the second conductor 42 in the second direction D2 that are conducive to the stable operation of the zero sequence transformer CT can be found out.

[0105] When the zero sequence transformer CT is used in products, the favorable positions of the first conductor 41 and the second conductor 42 in the second direction D2 obtained during the characteristic detection can be referred to for the installation of the zero sequence transformer CT. In this way, the working stability of the zero sequence transformer CT can be improved, and the probability of misoperation of the zero sequence transformer CT can be reduced.

[0106] Figure 5 The structural schematic diagram of the first wiring conductor used in the detection clamp provided by the embodiments of the present application, in some embodiments of the present application, the first wiring conductor 21 comprises a first vertical part 211, and the second wiring conductor 31 comprises a second vertical part 311, and the first vertical part 211 and the second vertical part 311 both extend along the third direction D3.

[0107] The first vertical part 211 and the second vertical part 311 are both provided with a second adjusting structure 212, and the second adjusting structure 212 is used to adjust the positions of the first conductor 41 and the second conductor 42 in the third direction D3, and the third direction D3 is perpendicular to the first direction D1 and perpendicular to the second direction D2.

[0108] Specifically, it is found in practice that the positions of the first conductor 41 and the second conductor 42 in the third direction D3 will have an influence on the output electromotive force of the zero sequence mutual inductor CT.

[0109] Please refer to Figure 2 , Figure 4 and Figure 5 , in some embodiments of the present application, the first vertical part 211 and the second vertical part 311 are both provided with a second adjusting structure 212, and the second adjusting structure 212 is used to adjust the positions of the first conductor 41 and the second conductor 42 in the third direction D3. When the zero sequence mutual inductor CT is tested, the first conductor 41 passes through the zero sequence mutual inductor CT, and one end of the first conductor 41 located outside the zero sequence mutual inductor CT is fixedly connected with the first vertical part 211 through the second adjusting structure 212, and the other end of the first conductor 41 located outside the zero sequence mutual inductor CT is fixedly connected with the second vertical part 311 through the second adjusting structure 212. The connection mode of the second conductor 42 is the same as that of the first conductor 41.

[0110] Since the second adjusting structure 212 can adjust the positions of the first conductor 41 and the second conductor 42 in the third direction D3, thus, when the zero sequence mutual inductor CT is tested, the positions of the first conductor 41 and the second conductor 42 in the third direction D3 can be adjusted to observe the output of the zero sequence mutual inductor CT, and the positions of the first conductor 41 and the second conductor 42 in the third direction D3 that are favorable to the stable operation of the zero sequence mutual inductor CT can be found out.

[0111] When the zero sequence mutual inductor CT is used for products, the favorable positions of the first conductor 41 and the second conductor 42 in the third direction D3 obtained during the characteristic detection can be referred to for the installation of the zero sequence mutual inductor CT, thus, the working stability of the zero sequence mutual inductor CT can be improved, and the probability of the misoperation of the zero sequence mutual inductor CT can be reduced.

[0112] Figure 6Another structure diagram of the first wiring conductor used in the detection fixture provided by the embodiments of the present application is shown. Please refer to Figure 6 In some embodiments of the present application, the position of the first conductor 41 and the second conductor 42 in the third direction D3 does not need to be adjusted during the test. For this case, the first vertical part 211 of the first wiring conductor 21 is provided with a round hole 214, and the first wiring conductor 21 can be connected with the corresponding first conductor 41 or second conductor 42 through the round hole 214. Similarly, the second vertical part 311 of the second wiring conductor 31 can also be provided with a round hole, and the second wiring conductor 31 can be connected with the corresponding first conductor 41 or second conductor 42 through the round hole.

[0113] Figure 7 A structure diagram of the third conductor used in the detection fixture provided by the embodiments of the present application is shown. Please refer to Figure 2 、 Figure 3 and Figure 7 In some embodiments of the present application, another intermediate conductor in the intermediate conductor unit is a third conductor 43, and the third conductor 43 is used to pass B-phase current.

[0114] The two ends of the third conductor 43 are respectively provided with third adjusting structures 431, and the third adjusting structures 431 are used to adjust the position of the third conductor 43 in the third direction D3. The third conductor 43 is detachably connected with the corresponding first wiring conductor 21 and second wiring conductor 31 through the third adjusting structures 431 at the two ends.

[0115] Specifically, along the second direction D2, the third conductor 43 used to pass B-phase current is generally centrally arranged in the opening of the zero sequence transformer CT, and the position of the third conductor 43 in the second direction D2 does not need to be adjusted during the test. In practice, it is found that the position of the third conductor 43 in the third direction D3 will affect the output electromotive force of the zero sequence transformer CT.

[0116] The fixture for zero sequence transformer CT characteristic detection provided by the embodiments of the present application, wherein the two ends of the third conductor 43 are provided with third adjusting structures 431, and the third conductor 43 is detachably connected with the corresponding first wiring conductor 21 and second wiring conductor 31 through the third adjusting structures 431 at the two ends. In this way, during the test, the output of the zero sequence transformer CT can be observed by adjusting the position of the third conductor 43 in the third direction D3, and the position of the third conductor 43 in the third direction D3 that is conducive to the stable operation of the zero sequence transformer CT can be found out.

[0117] When the zero sequence transformer CT is used in a product, the installation of the zero sequence transformer CT can be performed according to the favorable position of the third conductor 43 in the third direction D3 obtained during the characteristic detection, so that the working stability of the zero sequence transformer CT can be improved and the probability of misoperation of the zero sequence transformer CT can be reduced.

[0118] It should be noted that the position of the third conductor 43 in the third direction D3 can also be adjusted in other ways, for example, a third adjusting structure 431 can be arranged at the corresponding positions of the first wiring conductor 21 and the second wiring conductor 31 connected with the third conductor 43. In this regard, the present application is not limited.

[0119] Please continue to refer to Figure 2 、 Figure 4 、 Figure 5 and Figure 7 In some embodiments of the present application, at least one of the first adjusting structure 411, the second adjusting structure 212 and the third adjusting structure 431 is a slot.

[0120] Specifically, please refer to Figure 2 and Figure 4 The first conductor 41 is provided with a slot at both ends, and the first wiring conductor 21 can be provided with a corresponding first threaded hole, and the second wiring conductor 31 can also be provided with a corresponding second threaded hole. When the first conductor 41 is installed in the clamp for transformer characteristic detection, the extension direction of the slot is along the second direction D2, and the relative positions of the slot at one end of the first conductor 41 and the first threaded hole in the second direction D2 can be adjusted, and the relative positions of the slot at the other end of the first conductor 41 and the second threaded hole in the second direction D2 can be adjusted at the same time. After the positions are adjusted, one end of the first conductor 41 can be fixedly connected with the first wiring conductor 21 by a screw passing through the slot and the first threaded hole, and the other end of the first conductor 41 can be fixedly connected with the second wiring conductor 31 by a screw passing through the other slot and the second threaded hole.

[0121] Similarly, the installation structure of the second conductor 42 and the position adjustment mode in the second direction D2 are the same as those of the first conductor 41, which will not be described here.

[0122] Based on similar reasons, please refer to Figure 2 and Figure 5 When the second adjusting structure 212 is a slot, the slot of the first wiring conductor 21 and the second wiring conductor 31 extends along the third direction D3. When the first conductor 41 and the second conductor 42 are connected with the corresponding first wiring conductor 21 and the second wiring conductor 31, the positions of the first conductor 41 and the second conductor 42 in the third direction D3 can be adjusted through the slot.

[0123] Based on similar reasons, please refer to Figure 2 andFigure 7 When the third adjusting structure 431 is a slot, the slot of the third conductor 43 extends along the third direction D3, and the installation position of the third conductor 43 along the third direction D3 can be adjusted through the slot.

[0124] It should be noted that the slot is only one implementation of the first adjusting structure 411, the second adjusting structure 212 and the third adjusting structure 431. In other embodiments of the present application, the first adjusting structure 411, the second adjusting structure 212 and the third adjusting structure 431 can also have other implementations, such as the cooperation mode of the sliding groove and the sliding rail.

[0125] Please refer to Figure 2 and Figure 5 or Figure 2 and Figure 6 In some embodiments of the present application, the first wiring conductor 21 includes a first horizontal part 213 connected with the first vertical part 211. The first horizontal part 213 is fixed to the first installation area and is used for electrical connection with the external connection line. The first insulating barrier 51 is arranged between adjacent first horizontal parts 213.

[0126] Specifically, the clamp for mutual inductor characteristic detection provided by the present application is used to detect the anti-interference characteristic of the zero sequence mutual inductor CT under large current. Therefore, the current flowing through the first horizontal part 213 is relatively large. The first insulating barrier 51 arranged between adjacent first horizontal parts 213 can play the role of phase-to-phase insulation, so that the arc is difficult to break through the phase-to-phase, thereby ensuring the safety of the test.

[0127] In addition, by arranging the first insulating barrier 51 between adjacent first horizontal parts 213, the first insulating barrier 51 plays the role of positioning for the installation of the first wiring conductor 21.

[0128] Please continue to refer to Figure 2 In some embodiments of the present application, the second wiring conductor 31 includes a second horizontal part 312 connected with the second vertical part 311. The second horizontal part 312 is fixed to the third installation area and is used for electrical connection with the external connection line. The second insulating barrier 61 is arranged between adjacent second horizontal parts 312.

[0129] Based on similar reasons, based on the clamp for mutual inductor characteristic detection provided by the embodiment, by arranging the second insulating barrier 61 between the second horizontal parts 312, the role of phase-to-phase insulation and positioning can also be played.

[0130] Please continue to refer to Figure 2 In some embodiments of the present application, another intermediate conductor in the intermediate conductor unit is a fourth conductor, and the fourth conductor is used to pass N-phase electricity. The fourth conductor is detachably connected with the corresponding first wiring conductor 21 and the second wiring conductor 31.

[0131] Specifically, the test fixture needs to access A, B, C three-phase power, when the wiring mode of three-phase power is selected as star connection mode, N-phase power needs to be used, another intermediate conductor of the intermediate conductor unit of the application is a fourth conductor, the fourth conductor is used to pass through N-phase power, in this way, the detection of the anti-interference characteristic of the zero sequence transformer CT can be met when the power supply of the product (such as the residual current circuit breaker) is in star connection mode.

[0132] Please continue to refer to Figure 2 With Figure 3 In some embodiments of the application, along the first direction D1, the first mounting area and the third mounting area are located on the opposite sides of the second mounting area.

[0133] Along the second direction D2, the plurality of first wiring conductors 21 in the input wiring unit are arranged in sequence in the first mounting area. The plurality of second wiring conductors 31 in the output wiring unit are arranged in sequence in the third mounting area.

[0134] Along the first direction D1, the first wiring conductor 21 and the second wiring conductor 31 are arranged one by one.

[0135] The first direction D1 is perpendicular to the second direction D2, and both the first direction D1 and the second direction D2 are parallel to the plane on which the base 1 is located.

[0136] Specifically, please continue to refer to 2 and Figure 3 Based on the fixture for transformer characteristic detection provided by the embodiment, the overall structure of the detection fixture is relatively regular and symmetrical, so it is convenient for the fixture for transformer characteristic detection to be made. In addition, it is also convenient for the installation of the zero sequence transformer CT and the intermediate conductor.

[0137] Please continue to refer to Figure 2 , Figure 4 and Figure 7 In some embodiments of the application, the intermediate conductor includes a first conductive part 4A, a second conductive part 4B and a third conductive part 4C.

[0138] The first conductive part 4A and the third conductive part 4C are located at opposite ends of the extension direction of the second conductive part 4B, the extension directions of the first conductive part 4A and the third conductive part 4C are perpendicular to the extension direction of the second conductive part 4B, and the first conductive part 4A and the third conductive part 4C extend towards the same side of the second conductive part 4B.

[0139] Specifically, the intermediate conductor can have various shapes, and in this embodiment, the intermediate conductor has a substantially U-shaped structure, which facilitates installation. During installation, the intermediate conductor passes through the opening of the zero sequence transformer CT, the second conductive part is located in the opening of the zero sequence transformer CT, and the first conductive part and the third conductive part are located outside the opening of the zero sequence transformer CT.

[0140] In addition, the extension direction of the linear hole on the intermediate conductor of this structure can be the same as the extension direction of the first conductive part, so that the intermediate conductor of this structure also has the characteristic of facilitating the arrangement of the linear hole, thereby facilitating the adjustment of the installation position of itself.

[0141] Please continue to refer to Figure 2 and Figure 3 In some embodiments of the present application, the first wiring conductor 21 and the second wiring conductor 31 have the same structure. In this way, the installation of the first wiring conductor 21 and the second wiring conductor 31 is facilitated, and the assembly efficiency of the detection clamp can be improved.

[0142] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0143] The above, the above embodiments are only used to illustrate the technical solutions of the present application, but not limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fixture for detecting the characteristics of a current transformer, characterized in that, include: A base, wherein a first mounting area, a second mounting area and a third mounting area are provided on the base, and the second mounting area is used to mount a zero-sequence current transformer; An input wiring unit is disposed in the first installation area, and the input wiring unit includes at least three first wiring conductors; wherein the three first wiring conductors are respectively used for inputting A-phase power, B-phase power and C-phase power; An output wiring unit is disposed in the third installation area, and the output wiring unit includes at least three second wiring conductors; wherein the three second wiring conductors are respectively used to output phase A power, phase B power and phase C power; An intermediate conductor unit includes at least three intermediate conductors, each of which can pass through an opening located in the zero-sequence current transformer, and both ends of the intermediate conductor are located outside the opening. The two ends of the intermediate conductor are detachably connected to corresponding first and second wiring conductors.

2. The fixture for detecting the characteristics of a current transformer according to claim 1, characterized in that, When the zero-sequence current transformer is installed in the second installation area, the central axis of the zero-sequence current transformer is parallel to the first direction. One of the intermediate conductors in the intermediate conductor unit is a first conductor, and the other intermediate conductor in the intermediate conductor unit is a second conductor. The first conductor is used to pass phase A electricity, and the second conductor is used to pass phase C electricity. Both ends of the first conductor and the second conductor are provided with a first adjustment structure, which is used to adjust the position of the first conductor and the second conductor in a second direction; the first conductor and the second conductor are detachably connected to the corresponding first wiring conductor and the corresponding second wiring conductor through the first adjustment structure at both ends; The first direction is perpendicular to the second direction, and both the first direction and the second direction are parallel to the plane where the base is located.

3. The fixture for detecting the characteristics of a current transformer according to claim 2, characterized in that, The first wiring conductor includes a first vertical portion, and the second wiring conductor includes a second vertical portion, both of which extend in a third direction; Both the first vertical section and the second vertical section are provided with a second adjustment structure, which is used to adjust the position of the corresponding first conductor and second conductor in the third direction. The third direction is perpendicular to the first direction and perpendicular to the second direction.

4. The fixture for detecting the characteristics of a current transformer according to claim 3, characterized in that, Another intermediate conductor in the intermediate conductor unit is a third conductor, which is used to pass phase B electricity; The third conductor is provided with a third adjustment structure at both ends. The third adjustment structure is used to adjust the position of the third conductor in the third direction. The third conductor is detachably connected to the corresponding first wiring conductor and second wiring conductor through the third adjustment structure at both ends.

5. The fixture for detecting the characteristics of a current transformer according to claim 4, characterized in that, At least one of the first adjustment structure, the second adjustment structure, and the third adjustment structure is a single-hole hole.

6. The fixture for detecting the characteristics of a current transformer according to claim 3, characterized in that, The first wiring conductor includes a first horizontal portion connected to the first vertical portion; The first horizontal part is fixed to the first mounting area and is used for electrical connection with an external connection line; The fixture for testing the characteristics of the current transformer also includes a plurality of first insulating barriers, and the first insulating barriers are provided between adjacent first horizontal parts. And / or, the second wiring conductor includes a second horizontal portion connected to the second vertical portion; The second horizontal part is fixed to the third mounting area for electrical connection with an external connection line; The fixture for testing the characteristics of the current transformer also includes a plurality of second insulating barriers, with the second insulating barriers disposed between adjacent second horizontal sections.

7. The fixture for detecting the characteristics of a current transformer according to claim 4, characterized in that, Another intermediate conductor in the intermediate conductor unit is a fourth conductor, which is used to pass N-phase electricity; The fourth conductor is detachably connected to the corresponding first and second wiring conductors.

8. The fixture for detecting the characteristics of a current transformer according to claim 1, characterized in that, Along the first direction, the first mounting area and the third mounting area are located on opposite sides of the second mounting area; Along the second direction, a plurality of first wiring conductors in the input wiring unit are arranged sequentially in the first mounting area; a plurality of second wiring conductors in the output wiring unit are arranged sequentially in the third mounting area; Along the first direction, the first wiring conductor and the second wiring conductor are arranged in a one-to-one correspondence; The first direction is perpendicular to the second direction, and both the first direction and the second direction are parallel to the plane where the base is located.

9. The fixture for detecting the characteristics of a current transformer according to any one of claims 1 to 8, characterized in that, The intermediate conductor includes a first conductive portion, a second conductive portion, and a third conductive portion; The first conductive portion and the third conductive portion are located at opposite ends of the extension direction of the second conductive portion. The extension directions of the first conductive portion and the third conductive portion are both perpendicular to the extension direction of the second conductive portion, and the first conductive portion and the third conductive portion extend toward the same side of the second conductive portion.

10. The fixture for detecting the characteristics of a current transformer according to any one of claims 1 to 8, characterized in that, The first wiring conductor has the same structure as the second wiring conductor.

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