Residual current transformer detection device and residual current transformer limiting tool thereof
By designing a residual current transformer limit fixture, the problem of inconvenient detection operation in the existing technology was solved, realizing a fast and simplified detection process and improving detection efficiency.
Patent Information
- Application Number
- CN202423003392.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-05
AI Technical Summary
In the existing technology, the testing operation of residual current transformers is inconvenient, requiring multiple manual installations and wiring, resulting in low testing efficiency and failing to meet the requirements of batch full inspection.
Design a residual current transformer limiting fixture, including a limiting fixture body and wires. The limiting fixture body is provided with a limiting protrusion and wires, which facilitates quick installation and removal of the residual current transformer, and connects it to a standard current source through the wires, simplifying the testing process.
It enables rapid detection of residual current transformers, simplifies the operation process, improves detection efficiency, and reduces detection time.
Smart Images
Figure CN223650583U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic testing technology, and in particular to a residual current transformer testing device and its residual current transformer limiting fixture. Background Technology
[0002] Residual current protection devices are electrical equipment used to protect electrical equipment from leakage current, preventing electrical fires and electric shock accidents caused by downstream equipment failures. At the same time, the residual current protection device must not be accidentally activated or disconnected under the normal operating current of the downstream equipment.
[0003] A residual current device (RCD) typically consists of a residual current transformer and a controller. The current balance of the residual current transformer is an important indicator of its characteristics.
[0004] Currently, the market offers mass-produced testing solutions for residual current transformers. Related technical solutions for testing residual current transformers include:
[0005] (1) The residual current transformer is tested by simulating the residual current through the single-core wire. A high-precision fixed-value resistor is connected in parallel to the output terminal of the coil. A residual current is provided to the through wire, and the voltage across the resistor is read by a multimeter or other testing equipment to determine whether the test voltage is within the design specification range, thereby verifying whether the residual current transformer meets the requirements.
[0006] (2) By installing the residual current transformer on the residual current protector, wiring according to the actual application, supplying the protector with the actual current, and then testing the residual current of the residual current transformer through a residual current transformer test module.
[0007] The above-mentioned technical solutions are inconvenient to operate, requiring manual installation, coordination, and wiring between residual current transformer devices multiple times, resulting in low testing efficiency and failing to meet the requirements for batch full inspection. Utility Model Content
[0008] The technical problem to be solved by this utility model is to provide a residual current transformer detection device and a residual current transformer limiting fixture.
[0009] The technical solution adopted by this utility model to solve its technical problem is: to construct a residual current transformer limiting fixture, the residual current transformer limiting fixture includes a limiting fixture body, the upper surface of the limiting fixture body is provided with limiting members at intervals, the limiting members include at least two limiting protrusions, the at least two limiting protrusions are arranged diagonally, the upper surface of the limiting fixture body and the at least two limiting protrusions define the mounting position for limiting the residual current transformer;
[0010] The limiting fixture body is also provided with a wire, the upper part of which protrudes from the upper side of the residual current transformer, and the two ends of the wire in the length direction are respectively used to connect to a standard current source.
[0011] In some embodiments, the limiting fixture body includes a circuit breaker, and the conductor includes a plurality of sub-conductors connected to the terminals of the circuit breaker.
[0012] In some embodiments, the circuit breaker includes a 2-pole circuit breaker or a 4-pole circuit breaker.
[0013] In some embodiments, the limiting protrusion is arc-shaped.
[0014] In some embodiments, the number of the limiting protrusions is two.
[0015] In some embodiments, the number of the limiting protrusions is four.
[0016] In some embodiments, the limiting member further includes a base, which is detachably connected to the upper surface of the limiting fixture body, and the base is provided with a plurality of wire-passing holes penetrating its upper and lower surfaces.
[0017] The upper surface of the base is provided with at least two limiting protrusions.
[0018] In some embodiments, the limiting member is detachably connected to the upper surface of the limiting fixture body by fasteners.
[0019] In some embodiments, the limiting member is an insulating member.
[0020] The present invention has the following advantages: the residual current transformer limiting fixture facilitates the installation and removal of the residual current transformer. After that, the residual current transformer can be connected to the detector to realize the detection of the residual current transformer. The operation is simple and convenient and can improve the work efficiency.
[0021] This application also provides a residual current transformer detection device, including the residual current transformer limiting fixture described in any of the above embodiments;
[0022] The residual current transformer detection device also includes a detector, which is detachably connected to the terminals of the residual current transformer via a terminal connection line.
[0023] The present invention has the following advantages: The residual current transformer to be tested is sleeved or installed on the mounting position defined by the limiting protrusion of the residual current transformer limiting fixture. The upper part of the conductor is located in the inner cavity of the residual current transformer and protrudes from the upper side of the residual current transformer. Then, the terminals of the residual current transformer are detachably connected to the tester through the terminal connection wire for testing. After testing one residual current transformer, the next residual current transformer 100 is tested. The test operation is simple and quick, which can realize rapid testing, reduce testing time, and improve testing efficiency. Attached Figure Description
[0024] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:
[0025] Figure 1 This is a schematic diagram of the residual current transformer detection device in some embodiments of this utility model;
[0026] Figure 2 This is a partial structural schematic diagram of the residual current transformer detection device in some embodiments of this utility model;
[0027] Figure 3 This is a schematic diagram of the structure of the residual current transformer detection device and the residual current transformer in some embodiments of this utility model.
[0028] Figure 4 This is a schematic diagram of the structure of the limiting member in some embodiments of this utility model;
[0029] Figure 5 This is a partial structural schematic diagram of the residual current transformer detection device in some other embodiments of this utility model;
[0030] Figure 6 This is a structural schematic diagram of the residual current transformer detection device and the residual current transformer in some other embodiments of this utility model.
[0031] Figure 7 This is a structural schematic diagram of the limiting member in some other embodiments of this utility model;
[0032] Figure 8 This is a partial structural schematic diagram of the residual current transformer detection device in some other embodiments of this utility model;
[0033] Figure 9This is a structural schematic diagram of the residual current transformer detection device and the residual current transformer in some other embodiments of this utility model.
[0034] Figure 10 This is a structural schematic diagram of the limiting member in some other embodiments of this utility model;
[0035] Figure 11 This is a partial structural schematic diagram of the residual current transformer detection device in some other embodiments of this utility model;
[0036] Figure 12 This is a structural schematic diagram of the residual current transformer detection device and the residual current transformer in some other embodiments of this utility model.
[0037] Figure 13 This is a structural schematic diagram of the limiting member in some other embodiments of this utility model;
[0038] Figure 14 This is a schematic diagram of the control circuit of the detector in some embodiments of this utility model;
[0039] Figure 15 This is a schematic diagram of the power supply circuit in some embodiments of this utility model. Detailed Implementation
[0040] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.
[0041] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0042] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0043] See Figure 1 This utility model discloses a residual current transformer detection device, including a residual current transformer limiting fixture 10. The residual current transformer limiting fixture 10 includes a limiting fixture body 11, and limiting members 12 are spaced apart on the upper surface of the limiting fixture body 11. The limiting members 12 include at least two limiting protrusions 122, which are arranged diagonally. The upper surface of the limiting fixture body 11 and the at least two limiting protrusions 122 define a mounting position for limiting the residual current transformer 100. In some embodiments, the residual current transformer 100 may also be defined as a "leakage current transformer".
[0044] The limiting fixture body 11 is also provided with a wire 20. The upper part of the wire 20 protrudes from the upper side of the residual current transformer 100. The two ends of the wire 20 in the length direction are respectively used to connect to the standard current source 30.
[0045] The residual current transformer limit fixture facilitates the installation and removal of the residual current transformer 100. After that, the residual current transformer 100 is connected to the detector 40 to realize the detection of the residual current transformer 100. The operation is simple and convenient and can improve work efficiency.
[0046] The residual current transformer detection device also includes a detector 40, which is detachably connected to the terminal 101 of the residual current transformer 100 via a terminal connection line 50. The terminal 101 of the residual current transformer 100 may be a gap located between the limiting protrusions 122.
[0047] In some embodiments, the limiting fixture body 11 includes a circuit breaker, and the conductor 20 includes several sub-conductors connected to the terminals of the circuit breaker. Terminals are provided at both the upper and lower ends of the circuit breaker, and the multiple sub-conductors are respectively connected to all terminals to form a series circuit. In some embodiments, the conductor 20 can also be defined as a "power line". Understandably, the conductor 20 of the standard current source 30 can be fixed to the same side terminal of the limiting fixture body 11, and other connecting terminals are connected through the conductor 20, forming a certain bending arc and extending a distance beyond the limiting fixture body 11. All conductors 20 are connected in series to form a circuit. In some embodiments, the standard current source 30 can output an excitation current, which is a low-voltage AC current, posing no risk of electric shock to the human body. The excitation current can be a 10A excitation current. The standard current source 30 can be selected from existing power supply equipment according to actual needs; no specific limitations are made here.
[0048] In some embodiments, the circuit breaker includes a 2-pole circuit breaker or a 4-pole circuit breaker. For example... Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, this circuit breaker is a 2-pole circuit breaker. Figure 8 , Figure 9 , Figure 11 , Figure 12 As shown, the circuit breaker is a 4-pole circuit breaker. Of course, the circuit breaker can also be other specifications, which are not specifically limited here. In some other embodiments, the limiting fixture body 11 can also be other fixed conductor structures, which are not specifically limited here.
[0049] like Figures 2 to 13 As shown, the limiting protrusion 122 is arc-shaped, has rounded corners, or has an angled edge, facilitating the insertion and positioning of the residual current transformer 100. Gaps are left between the limiting protrusions 122 to facilitate the removal of the residual current transformer 100. Furthermore, the multiple spaced limiting protrusions 122 not only provide a limiting function but also save costs. The spatial gaps between adjacent limiting protrusions 122 provide a certain degree of mobility redundancy, improving their applicability.
[0050] In some embodiments, such as Figures 2 to 4 ,as well as Figures 9 to 11As shown, there are two limiting protrusions 122.
[0051] In other embodiments, such as Figures 5 to 7 ,as well as Figures 12 to 13 As shown, there are four limiting protrusions 122. The four limiting protrusions 122 are arranged approximately at the four corners.
[0052] In some embodiments, the limiting member 12 further includes a base 121, which is detachably connected to the upper surface of the limiting fixture body 11. The base 121 is provided with a plurality of wire-passing holes 1211 penetrating its upper and lower surfaces. When the limiting fixture body 11 is a 2-pole circuit breaker, the number of wire-passing holes 1211 is two, and when the limiting fixture body 11 is a 4-pole circuit breaker, the number of wire-passing holes 1211 is four.
[0053] The base 121 can be generally cylindrical or dome-shaped to facilitate fitting onto the upper part of the limiting fixture body 11 for positioning and limiting, followed by connection and fixation. The upper surface of the base 121 can be generally rectangular, and at least two limiting protrusions 122 are provided on the upper surface of the base 121. The at least two limiting protrusions 122 are arranged approximately diagonally with respect to the shape of the upper surface of the base 121. The limiting protrusions 122 can be inner or outer limiting protrusions.
[0054] In some embodiments, the limiting member 12 is detachably connected to the upper surface of the limiting fixture body 11 via a fastener 13. For example... Figure 4 , Figure 7 , Figure 10 as well as Figure 13 As shown, the base 121 may be provided with fixing holes 1212. The fastener 13 may be, but is not limited to, bolts or screws. The fastener 13 passes through the fixing holes 1212 to connect and fix the limiting member 12 and the limiting fixture body 11. There may be multiple fixing holes 1212, and their setting positions and numbers can be selected and set according to actual needs. No specific limitation is made here.
[0055] In some embodiments, the limiting member 12 is an insulating member. The limiting member 12 may be made of a rigid insulating material, such as phenolic plastic, polyurethane plastic, epoxy plastic, unsaturated polyester plastic, furan plastic, silicone resin, acrylic resin, and modified resin thereof.
[0056] In some embodiments, the limiting member 12 is an integral structure.
[0057] In other embodiments, the limiting protrusion 122 may also be directly disposed on the upper surface of the limiting fixture body 11.
[0058] In some embodiments, Figure 14 This is a schematic diagram of the control circuit of the detector 40, which may include a residual current imbalance detection, calibration and conversion module, including an adjustable resistor RP1, a current-limiting resistor R2, a current-limiting resistor R3, a clamping protection diode D7, and a leakage current calculation chip U2. The adjustable resistor RP1 can set the qualified standard value of the residual current transformer current imbalance, and the leakage current calculation chip U2 can amplify the sampled voltage signal and convert it into a DC voltage signal.
[0059] In some embodiments, Figure 14 This is a schematic diagram of the control circuit of the detector 40, which may include an indicator module and a voltage divider circuit composed of resistors R9 and R14. The voltage across resistor R14 after voltage division is connected to the inverting input of operational amplifier U3 as a comparison reference level. The output level of the leakage current operation chip U2 is connected to the non-inverting input of operational amplifier U3. When the imbalance of the residual current transformer 100 is small and within the acceptable range, the level at the inverting input of operational amplifier U3 is higher than the level at the non-inverting input, the output pin of operational amplifier U3 is low, Q1 is turned on, Q2 is turned off, the qualified indicator LED2 (green) is on, and the unqualified indicator LED3 (red) is off. When the imbalance of the residual current transformer 100 is large and exceeds the acceptable range, the level at the inverting input of operational amplifier U3 is lower than the level at the non-inverting input, the output pin of operational amplifier U3 is high, Q1 is turned off, Q2 is turned on, the qualified indicator LED2 (green) is off, and the unqualified indicator LED3 (red) is on. Specific circuit details can be determined according to... Figure 14 The specific implementation details will not be elaborated upon here.
[0060] Combined Figure 1 As shown, the detector 40 may also be equipped with an imbalance adjustment knob, a power indicator light, a pass indicator light, a fail indicator terminal, and a terminal connection wire 50 for connecting to the residual current transformer 100. The terminal connection wire 50 is a flexible wire that can be easily connected to the terminal 101 of the residual current transformer 100. Of course, the detector 40 may also use a detector of the prior art, which is not specifically limited here.
[0061] like Figure 15 This is a regulated power supply circuit for a standard current source 30 in some embodiments; the specific circuit can be determined according to... Figure 15 The implementation details are omitted here. Of course, other regulated power supply circuits or existing standard current sources can also be used for the standard current source 30; no specific limitations are made here.
[0062] In this embodiment, the residual current transformer testing device is applied as follows: the standard current source 30 is kept on and connected to the wire 20. The residual current transformer 100 to be tested is sleeved or installed on the mounting position defined by the limiting protrusion 122 of the residual current transformer limiting fixture 10. The upper part of the wire 20 is located in the inner cavity of the residual current transformer 100 and protrudes from the upper side of the residual current transformer 100. Then, the terminal 101 of the residual current transformer 100 is detachably connected to the tester 40 through the terminal connection line 50 for testing. After testing one residual current transformer 100, the next residual current transformer 100 is tested. The testing operation is simple and quick, which can realize rapid testing, reduce testing time, and improve testing efficiency.
[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0064] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.
Claims
1. A limiting fixture for a residual current transformer, characterized in that, The residual current transformer limiting fixture (10) includes a limiting fixture body (11), and the upper surface of the limiting fixture body (11) is provided with limiting members (12) at intervals. The limiting members (12) include at least two limiting protrusions (122), which are arranged diagonally. The upper surface of the limiting fixture body (11) and the at least two limiting protrusions (122) define the mounting position for limiting the residual current transformer (100). The limiting fixture body (11) is also provided with a wire (20), the upper part of which protrudes from the upper side of the residual current transformer (100), and the two ends of the wire (20) in the length direction are respectively used to connect to the standard current source (30).
2. The residual current transformer limiting fixture according to claim 1, characterized in that, The limiting fixture body (11) includes a circuit breaker, and the conductor (20) includes a plurality of sub-conductors connected to the terminals of the circuit breaker.
3. The residual current transformer limiting fixture according to claim 2, characterized in that, The circuit breaker includes a 2-pole circuit breaker or a 4-pole circuit breaker.
4. The residual current transformer limiting fixture according to claim 1, characterized in that, The limiting protrusion (122) is arc-shaped.
5. The residual current transformer limiting fixture according to claim 1, characterized in that, The number of the limiting protrusions (122) is two.
6. The residual current transformer limiting fixture according to claim 1, characterized in that, The number of the limiting protrusions (122) is four.
7. The residual current transformer limiting fixture according to claim 1, characterized in that, The limiting member (12) also includes a base (121), which is detachably connected to the upper surface of the limiting fixture body (11), and the base (121) is provided with a plurality of wire holes (1211) that pass through its upper and lower surfaces. The upper surface of the base (121) is provided with at least two limiting protrusions (122).
8. The residual current transformer limiting fixture according to claim 1, characterized in that, The limiting member (12) is detachably connected to the upper surface of the limiting fixture body (11) by fasteners (13).
9. The residual current transformer limiting fixture according to claim 1, characterized in that, The limiting member (12) is an insulating member.
10. A residual current transformer detection device, characterized in that, Includes the residual current transformer limiting fixture (10) as described in any one of claims 1 to 9; The residual current transformer detection device also includes a detector (40), which is detachably connected to the terminal (101) of the residual current transformer (100) via a terminal connection line (50).