• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a current clamp (1) for contactless testing of electrically conductive cables, for direct and alternating current measurement comprising a housing (2), a receptacle (3) comprising a first and second receptacle element (4a, 4b) for the cable to be tested, which in the open state of the receiving elements (4a, 4b) forms a through opening (11) open on one side and in the closed state of the receiving elements (4a, 4b) a closed, elongated or elongated through opening (11), with at least one receiving element (4a and / or 4b) is movably mounted. The current clamp (1) is characterized in that the receptacle (3) forms a stop for the cable to be tested on the side of the receptacle (3) assigned to the housing (2) when the receptacle elements (4a, 4b) are open.
    公开号:CH717091A2
    申请号:CH01537/20
    申请日:2020-12-04
    公开日:2021-07-30
    发明作者:Lehner Harald
    申请人:Conrad Electronic Se；
    IPC主号:
    专利说明:

    The present invention relates to a clamp meter for preferably contactless testing of electrically conductive cables according to the preamble of claims 1 and 8.
    Technological background
    Current clamps are used, among other things, for checking insulated electrical lines in control cabinets. With current clamps this is z. B. a non-contact measurement of the current is possible. This means that the circuit does not have to be disconnected for measuring the current intensity. This enables electrical systems to be tested during operation, so that the measurement results correspond to the real operating conditions and, in particular, critical infrastructure, such as machine control systems, does not have to be switched off.
    [0003] Current clamps usually have a receptacle with a through opening. The receptacle comprises an iron core which, when the receptacle is closed, forms a ring. For the measurement, the receptacle is opened and the cable to be tested is inserted into the through opening. When the cable conducts electricity, a magnetic field is created around the cable. This magnetic field magnetizes the ring-shaped iron core, which induces a current in a secondary coil which is wound around the iron core. This current can be measured and is proportional to the current in the conductor under test. A proper measurement can only be carried out if there is only one conductive cable in the through opening.
    [0004] Currently available current clamps have very large receptacles, which greatly impairs their manageability. This has a negative effect, especially in control cabinets, as there are many cables in a very narrow space. It is particularly difficult here to expose the cable to be tested from the other cables and to insert only this into the receptacle of the current clamp. Most cables are exposed by hand, so both hands are required to properly test a cable. As a result, there is no free hand with which the measured values can be noted and / or the emergency stop button of the system can be actuated in the event of danger. In addition, cables are often exposed under the action of force, as a result of which cables can be damaged or pulled out of their connection terminals. On the one hand, this represents a risk for the user, since current-conducting cable contacts can be exposed; on the other hand, it can lead to a failure of the electrical system. Exposing the cable to be tested also takes a lot of time, which makes checking electrical systems much more difficult.
    State of the art in print
    From US 8,922,195 B2 a receptacle with two receiving elements for a current clamp is known, which is just as wide on the side facing the housing as the housing of the current clamp. This makes it more difficult to test cables lying close together in control cabinets.
    A clamp meter for testing individual cables is also known from DE 20 2015 004 037 U1. This current clamp has a receptacle which is opened laterally. For this purpose, part of the receptacle in the current clamp housing is designed to be retractable. The opposite part of the receptacle is C-shaped or designed as a hook. With this clamp meter, too, the receptacle is just as wide as the clamp meter housing.
    From WO 2007/127617 a current clamp is known whose receptacle can be removed from the housing and remains connected to it via a cable. In this current clamp, the through opening is relatively small and circular. This means that cables can only be picked up perpendicular to the current clamp. In addition, there is a risk of cables being inserted too deeply into the receptacle and being pinched and / or damaged when the receptacle is closed. As a result, this clamp meter is also difficult to use in areas of control cabinets that are difficult to access. When the current clamp is opened, a gap is created on the underside of the through opening that extends up to the pivot point.
    Object of the present invention
    The object of the present invention is to provide a clamp meter which simplifies the testing of cables in electrical systems.
    Solution of the task
    The above object is achieved by a current clamp according to the features of claims 1 and 8. Appropriate refinements are claimed in the subclaims.
    A current clamp according to the present invention comprises a housing and a receptacle comprising a first and a second receiving element. In the closed state of the receptacle, the receptacle elements form a through opening. The receptacle can be opened by a handle, as a result of which the through opening opens on one side and a cable can be inserted into the through opening. According to the invention, a stop for the cable to be tested is formed on the side of the receptacle assigned to the housing. This stop prevents the cable to be tested from accidentally getting too far into the receptacle. This is advantageous because it prevents the cable from being clamped between the two receiving elements during the closing process. This can prevent damage to the cable to be tested. In addition, the operation of the clamp meter is significantly simplified.
    Appropriately, the stop can be realized in that the passage opening on the side facing the housing remains closed by a corresponding contouring of the receiving elements in the open state of the receptacle at least over a portion, d. H. no gap is created on the underside of the through opening over the entire depth of the receptacle.
    Preferably, a receiving element on the side facing the housing can have a region which, in a front view of the receptacle in the closed state, extends over the center line of the receptacle.
    It can be particularly advantageous if the area which, in the front view in the closed state of the receptacle, extends over the center line of the receptacle, is oriented upwards away from the housing. Due to the upward-oriented area, an inserted cable slides down towards the housing and thereby positions itself in a favorable measuring position.
    According to a further embodiment of the invention, at least one overlap region can be provided in which the region of the receiving element extends over the center line in the closed state of the receptacle over a region of the opposite receiving element. This covers a gap on the underside of the through opening.
    It can be particularly advantageous if two overlapping areas are provided, which are positioned opposite one another on the respective outer side of the receptacle. As a result, pinching of the inserted cable between the receiving elements on both sides of the receiving means can be avoided particularly effectively. As a result, a gap on the underside of the through opening is covered on both sides.
    The receiving elements can expediently terminate flush in the side region of the receiving element in the closed state.
    The above object is also achieved by a current clamp according to the features of claim 8, which is also claimed in an independent manner.
    Because the receptacle of the clamp meter can have at least one, preferably two shoulders, the receptacle can be dimensioned significantly smaller than the housing of the clamp meter. This enables improved handling of the clamp meter in electrical systems that are particularly difficult to access, such as, for example, in control cabinets with tightly positioned wiring. In addition, this configuration means that no second hand is required for spatial insulation of the cable to be tested, since the cable to be tested can be selected particularly easily with the current clamp according to the invention. This makes it possible to operate the clamp meter with one hand even in electrical systems such as switch cabinets. This is particularly beneficial because the second hand can be used to note down measured values or to press the emergency stop button in the event of danger.
    The shoulder can be formed by an offset of the receiving element directed towards the longitudinal axis of the receptacle. The transition between the housing and the shoulder, or between the shoulder and the region of the receiving element oriented away from the housing, or the shoulder itself or a combination thereof, can be designed, for example, as a corner region, incline or curvature.
    According to a further advantageous embodiment of the current clamp, the outer sides of the receiving elements can run parallel to one another at least over a partial area. Due to the parallel configuration, the receptacle can be made particularly slim.
    It can be particularly advantageous if the through opening is located between the parallel subregions of the receiving elements.
    The fact that a non-contact measurement of the electrical current strength of more than 1 A, preferably of more than 10 A, can be possible with the current clamp, it is particularly suitable for use when testing cables in control cabinets.
    According to a further embodiment of the invention, only one receiving element can be movably mounted, in particular tilting or rotating, while the second receiving element is rigidly attached.
    The through opening can expediently be positioned essentially in the area of the upper half of the receptacle. This positioning allows the opening angle of the current clamp receptacle to be reduced so that the receptacle is narrower than the housing even when it is open. Thus, even when the clamp meter is open, only little space is required and the handling of the clamp meter in electrical systems or control cabinets is significantly simplified.
    It can be particularly expedient for the separating surface of the receiving elements to be of essentially flat design in the area above the through opening. This enables a reduced opening angle of the receptacle for inserting the cable, as a result of which the current clamp requires less space when the receptacle is open.
    The feature that when the receptacle is fully open, the top access opening of the through opening is only up to a factor of 1.3 larger than the diameter or the width of the through opening in the transverse direction in the closed state, also contributes to the fact that the receptacle is made very narrow even when open.
    Description of the invention based on an exemplary embodiment
    An expedient embodiment of the invention is explained in more detail below with reference to the drawing figures. 1 shows an illustration of an embodiment of a current clamp in a front view with a closed receptacle; FIG. 2 shows an illustration of the current clamp according to FIG. 1 in a front view with the receptacle open; FIG. 3 shows an illustration of the current clamp according to FIG. 1 in a rear view with a closed receptacle, and FIG. 4 shows an illustration of the current clamp according to FIG. 1 in a rear view with an open receptacle.
    Reference number 1 in Fig. 1 denotes the current clamp according to the invention in its entirety. The current clamp 1 comprises a housing 2, which also serves as a handle, and a receptacle 3 for the cable to be tested. The receptacle 3 comprises two receptacle elements 4a, 4b. The receiving elements 4a, 4b form a through opening 11 with a diameter or a width B2. In the closed state of the receptacle 3, the through opening 11 forms an elongated hole. Alternatively, the through opening 11 can also have a round or elliptical shape.
    By means of a handle 8 in the form of a pusher on one side of the housing 2, the receptacle 3 can be opened. For this purpose, the receiving element 4a is mounted such that it can tilt or rotate. By pressing on the handle 8, the receiving element 4a can be tilted or rotated outwards relative to the rigid receiving element 4b up to a maximum opening angle α, see a cable (not shown in the figures) can be inserted into the through opening 11.
    If the handle 8 is released, the receptacle 3 is automatically closed by a spring mechanism (not shown in the figures).
    When the cable conducts current, a magnetic field is formed around this cable, which magnetizes a ring-shaped iron core (not shown in the figures) arranged in the receiving elements 4a, 4b in the closed receptacle 3. This magnetization induces a measurable current in a secondary coil (not shown in the figure) surrounding the iron core, which can be measured and is proportional to the current in the cable.
    In addition, preferably two measuring sockets (not shown in the figures) can be located on the underside of the housing 2, for example. Measuring tips can be connected to these for direct measurement at electrical contacts of a system. In this way, for example, the electrical voltage and / or the electrical resistance can also be measured with the aid of the current clamp.
    Furthermore, the housing 2 can comprise a plurality of switches 12, an adjusting wheel 9 and a display 10. The current clamp 1 can be switched on via the setting wheel and, for example, various measured variables (e.g. electrical current strength, electrical voltage and / or electrical resistance) can be selected. The switch 12 can be used, for example, between different measurement modes, such as. B. a direct current measurement, alternating current measurement and / or various measured variables can be changed. The measured values determined and / or status data of the current clamp and / or activated measurement modes can be shown on the display 10. It may also be possible to use the switches 12 to set the display to zero and / or to activate a display lighting.
    On the side facing the housing 2, the receptacle 3 has shoulders 6a, 6b. The shoulders 6a, 6b produce a very narrow receptacle 3 compared to the housing 2. As a result, the receptacle 3 can be inserted particularly advantageously into wiring of switch cabinets.
    The shoulder can be provided with a width B1 and formed by an offset towards the longitudinal axis of the current clamp 1. The shoulders 6a, 6b can be designed as a corner area, incline or rounding. As a result, the receptacle 3 is designed to be significantly slimmer than the housing 2.
    The receiving elements 4a, 4b have at least partially parallel side surfaces. The through opening 11 is preferably located between the parallel partial areas of the receiving elements 4a, 4b. As a result of this configuration, the receptacle 3 of the current clamp 1 can be dimensioned particularly slim.
    In the closed state of the receptacle 3, a region 5a of the receptacle element 4b extends at the lower end of the through opening 11 over the center line M of the receptacle 3 towards the receptacle element 4a. The tip of the area 5 a facing away from the housing 2 is oriented slightly upwards away from the housing 2. The receiving element 4a extends between the through opening 11 and the housing 2 up to the center line M of the receptacle. As a result, an overlap area 7a, shown hatched in FIG. 1, forms in area 5a, in which the two receiving elements 4a, 4b in FIG. 1 overlap.
    The receiving element 4a has a recess 14a corresponding to the contour of the area 5a, cf. close flush when closed.
    2 shows a front view of the current clamp 1 according to the invention in the open state of the receptacle 3. The special shape of the receptacle element 4a and 4b forms a stop which prevents a cable located in the through opening 11 from being accidentally jammed. For this purpose, the area 5a of the receiving element 4b extends in the open state up to the recess 14a of the receiving element 4a or even somewhat into it. As a result, when the receptacle 3 is open, the through opening 11 remains on the side d facing the housing 2 of the current clamp 1. H. closed at the bottom. This forms the stop which prevents an inserted cable from getting too deep into the receptacle 3 and from being pinched and / or damaged during the closing process of the receptacle 3.
    Furthermore, the access opening 13 in the maximally open state of the receptacle 3 is only slightly, in particular by up to a factor of 1.3 wider than the width B2 of the through opening 11 in the closed state of the receptacle 3. This also ensures that the receptacle 3 is very narrow in the closed state.
    3 shows the rear view of the current clamp 1 from FIG. 1. As can be seen from FIG. In the closed state of the receptacle 3, an overlap region 7b of the receptacle elements 4a, 4b, shown hatched in FIG. 3, is thus also formed on the rear side.
    The contour of the recess 14b, see FIG. 4, of the receiving element 4a corresponds to the shape of the area 5b. Correspondingly, overlapping areas 7a, 7b are provided on both the front and the rear of the receptacle 3. A stop is thus also formed on the rear side due to the special shape of the receiving elements 4a and 4b, which prevents a cable located in the through opening 11 from being accidentally jammed.
    The through opening 11 is located essentially in the area of the upper half of the receptacle 3. This reduces the opening angle α of the receptacle 3. This makes the current clamp easy to handle in the tight wiring of a control cabinet. In addition, flat, opposing separating surfaces 15 of the receiving elements 4 a, 4 b also contribute to a small opening angle α of the receiving element 3. As a result, the receptacle 3 is very much slimmer than the housing 2 even in the open state. This has particularly positive effects on the handling of the current clamp 1 in switch cabinets.
    With the current clamp 1 according to the invention, an electrical current strength of more than 1 A, particularly preferably of more than 10 A, is preferably measured.
    It is expressly pointed out that the combination of individual features and sub-features are also to be regarded as essential to the invention and included in the disclosure content of the application.
    REFERENCE LIST
    1 current clamp 2 housing 3 receptacle 4a receptacle element 4b receptacle element 5a area over M 5b area over M 6a shoulder 6b shoulder 7a overlap area 7b overlap area 8 handle 9 setting wheel 10 display 11 passage opening 12 switch 13 access opening 14a recess 14b recess 15 separation area B1 shoulder width B2 Width of the passage opening M center line of the receptacle α opening angle
    权利要求:
    Claims (16)
    [1]
    1. Current clamp (1) for preferably non-contact testing of electrically conductive cables (18), preferably for direct and alternating current measurementsa housing (2),a first and second receiving element (4a, 4b) comprising a receptacle (3) for the cable to be tested, which in the open state of the receiving elements (4a, 4b) a through opening (11) open on one side and in the closed state of the receiving elements (4a, 4b ) forms a closed, preferably elongated or elongated hole, through opening (11), at least one receiving element (4a and / or 4b) being movably mounted, characterized in thatthe receptacle (3) in the open state of the receptacle elements (4a, 4b) on the side of the receptacle (3) assigned to the housing (2) forms a stop for the cable to be tested.
    [2]
    2. Current clamp (1) according to claim 1, characterized in that in the open state of the first and second receiving elements (4a, 4b) the through opening (11) on the side facing the housing (2) remains closed.
    [3]
    3. Current clamp (1) according to claim 1 or 2, characterized in that a receiving element (4b) on the side facing the housing (2) has an area (5a, 5b) which extends over the center line M in the closed state of the receptacle ( 3) extends away.
    [4]
    4. Current clamp (1) according to claim 3, characterized in that the area (5a, 5b) beyond the center line M in the closed state of the receptacle (3) is oriented upwards away from the housing (3).
    [5]
    5. Current clamp (1) according to claim 3 or 4, characterized in that at least one overlap area (7a, 7b) is provided, in which the area (5a, 5b) of the receiving element (4b) extends over the center line M in the closed state of the receiving element (3) extends over a region (14a, 14b) of the opposite receiving element (4a).
    [6]
    6. Current clamp (1) according to claim 5, characterized in that two overlapping areas (7a, 7b) are provided which are positioned opposite one another on the respective outer side of the receptacle (3).
    [7]
    7. Current clamp (1) according to at least one of the preceding claims, characterized in that the receiving elements (4a, 4b) terminate flush in the side region of the receiving element (3) in the closed state.
    [8]
    8. Current clamp (1) for preferably non-contact testing of electrically conductive cables (18), preferably comprising for direct and alternating current measurementa housing (2),a first and second receiving element (4a, 4b) comprising a receptacle (3) for the cable to be tested, which in the open state of the receiving elements (4a, 4b) a through opening (11) open on one side and in the closed state of the receiving elements (4a, 4b ) forms a closed, preferably elongated or elongated hole, through opening (11), at least one receiving element (4a and / or 4b) being movably mounted, orCurrent clamp according to one of the preceding claims, characterized in thatthe receptacle (3) has at least one shoulder (6a, 6b), the width B1 of which is greater than the maximum width B2 of the through opening (11).
    [9]
    9. Current clamp (1) according to claim 8, characterized in that the shoulder (6a, 6b) is formed by an offset of the receiving element (4a, 4b) directed towards the longitudinal axis of the receptacle (3).
    [10]
    10. Current clamp (1) according to at least one of the preceding claims, characterized in that the outer sides of the receiving elements (4a, 4b) run parallel to one another at least over a partial area.
    [11]
    11. Current clamp (1) according to at least one of the preceding claims, characterized in that the through opening (11) is located between the parallel partial areas of the outer sides of the receiving elements (4a, 4b).
    [12]
    12. Current clamp (1) according to at least one of the preceding claims, characterized in that the current clamp (1) is suitable for the non-contact measurement of currents with an electrical current strength of more than 1 A, preferably more than 10 A.
    [13]
    13. Current clamp (1) according to at least one of the preceding claims, characterized in that a receiving element (4a) is mounted movably, in particular tilting or rotating, whereas the further receiving element (4b) is rigidly attached.
    [14]
    14. Current clamp (1) according to at least one of the preceding claims, characterized in that the through opening (11) is located at least substantially in the area of the upper half of the receptacle (3).
    [15]
    15. Current clamp (1) according to at least one of the preceding claims, characterized in that the separating surface (15) of the receiving elements (4a, 4b) is essentially flat in the area above the through opening (11).
    [16]
    16. Current clamp (1) according to at least one of the preceding claims, characterized in that when the receptacle (3) is completely open, the access opening (13) on the top side to the through opening (11) is only up to a factor of 1.3 larger than the diameter or the width of the Through opening.
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    同族专利:
    公开号 | 公开日
    DE202020100469U1|2020-02-12|
    CH717091B1|2021-12-15|
    GB2592111A|2021-08-18|
    GB202019520D0|2021-01-27|
    GB2592111B|2022-03-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR3001296B1|2013-01-18|2016-01-22|Chauvin Arnoux|LOOP MEASURING CLAMP IN PARTICULAR EARTH OF THE TYPE COMPRISING A SOLIDARITY JAR OF A FIXED SUPPORT AND A PIVOTING MOUNTED JAW ON THE SUPPORT|
    法律状态:
    2021-08-31| AZW| Rejection (application)|
    优先权:
    申请号 | 申请日 | 专利标题
    DE202020100469.7U|DE202020100469U1|2020-01-29|2020-01-29|Clamp meter|
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