Disconnectable terminal for measurement
By integrating a short-circuit bridge into the disconnectable terminals for measurement, the problem of damage caused by open-circuit operation of the current converter on the secondary side is solved, realizing a safe and reliable short-circuit function for the current converter, simplifying the operation process and reducing the number of terminals.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WAGO VERW GMBH
- Filing Date
- 2025-12-15
- Publication Date
- 2026-06-19
AI Technical Summary
In the prior art, current converters are prone to damage when the secondary side is open, and the need for an additional short-circuit bridge connection makes operation complicated, and the safety and reliability of the short-circuit function cannot be guaranteed.
A short-circuit bridge is integrated into the disconnectable terminal for measurement. The first switching element and the second switching element are electrically connected at a specific position to ensure safe switching of the current converter between the running, short-circuit and measurement positions, avoid open circuit situations, and simplify the operation process.
It achieves safe short-circuiting of the current converter, simplifies the operation process, reduces the number of terminals, ensures the reliability and compactness of the circuit, and avoids the risk of users forgetting to plug in the external short-circuit bridge.
Smart Images
Figure CN122245985A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a disengaged measuring terminal for switchably connecting a current converter to an electricity meter, wherein the disengaged measuring terminal has a housing having a current converter connection side and an electricity meter connection side, wherein at least one first current converter side wire connector and a second current converter side wire connector are provided on the current converter connection side for connecting at least one contact of the current converter, and at least one first electricity meter side wire connector and a second electricity meter side wire connector are provided on the electricity meter connection side for connecting at least one contact of the electricity meter, wherein the disengaged measuring terminal has at least one movable first switching element and a movable second switching element separate from the first switching element, the first switching element and the second switching element being insulated from each other, wherein the disengaged measuring terminal has an external first operating element coupled to the first switching element and an external second operating element separate from the external first operating element and coupled to the second switching element, wherein the external first and second operating elements can move independently of each other between a first operating position toward the current converter connection side and a second operating position toward the electricity meter side. Background Technology
[0002] Such a disconnectable measuring terminal is known from DE 44 44 551 A1, also referred to as a current converter-disconnectable terminal or a current converter-measuring disconnectable terminal. To avoid damage to the current converter, it is absolutely forbidden to operate the current converter with its secondary side open. Therefore, for example, the current converter needs to be short-circuited before performing measurement and testing operations in a circuit with a disconnectable measuring terminal. Summary of the Invention
[0003] The objective of this invention is to provide a further improved disconnectable terminal for measurement.
[0004] The aforementioned objective is achieved in the type of disconnectable measuring terminal mentioned at the beginning by having a short-circuit bridge structurally integrated into the housing, through which a first switching element is electrically connected to a second switching element at least in one of the first and second operating elements. This fixed mounting of the short-circuit bridge within the housing ensures that the short circuit required to prevent damage to the current converter is also performed safely and reliably, and will not fail, for example, due to the user forgetting to plug the separate short-circuit bridge, as required by the prior art, into the disconnectable measuring terminal.
[0005] By structurally integrating the short-circuit bridge into the housing, the short-circuit function of the disconnectable measurement terminals is also protected from damage or tampering. Furthermore, the disconnectable measurement terminals can be designed more compactly overall. In particular, external connectors for plugging into external short-circuit bridges are not required.
[0006] Therefore, the present invention generally enables simpler operation of the disconnectable terminals for measurement and a reduction in the number of terminals required for each converter circuit. Another advantage is that, unlike the two disconnectable terminals arranged side by side to date, the user only needs to install a single disconnectable terminal for measurement in the electrical installation.
[0007] According to an advantageous design of the invention, the measuring disconnectable terminal configuration is used to electrically connect, in the operating position, a first current converter side lead connector to a first meter side lead connector via a first switching element, and a second current converter side lead connector to a second meter side lead connector via a second switching element. In this operating position, the first and second operating elements are in a second operating position, wherein the first and second switching elements are not electrically connected to each other. This operating position allows the current converter to be connected to the corresponding terminals of the meter on both sides, i.e., via its first and second current converter side lead connectors. In this operating state, the meter can operate normally. Current flows from the current converter to the meter via the first switching element and from the meter back to the current converter via the second switching element.
[0008] According to an advantageous design of the invention, a disconnectable terminal configuration for measurement is provided for electrically connecting, in a short-circuit position, a first current converter-side lead connector to a first meter-side lead connector via a first switching element, and a second current converter-side lead connector to a second meter-side lead connector via a second switching element, and additionally, electrically connecting the first and second switching elements via a short-circuit bridge. In this short-circuit position, the first and second operating elements are in a third operating position, which is between the first and second operating positions. The short-circuit position enables a defined transition state from the operating position to the measuring position. In this short-circuit position, the current can still continue to flow as previously described in the operating position, but additionally, it is possible for current to flow from the first switching element to the second switching element via the short-circuit bridge and then back to the current converter. This ensures that the circuitry of the current converter is never open-circuited during the transition between the operating and measuring positions. In this manner, erroneous operation is reliably avoided.
[0009] According to an advantageous design of the invention, a detachable terminal configuration for measuring is provided for electrically separating the first current converter-side lead connector from the first meter-side lead connector via a first switching element in a measuring position, and electrically separating the second current converter-side lead connector from the second meter-side lead connector via a second switching element, and additionally electrically connecting the first switching element and the second switching element via a short-circuit bridge. In this measuring position, the first and second operating elements are in a first operating position, wherein the first current converter-side lead connector is electrically connected to the second current converter-side lead connector via the short-circuit bridge, the first switching element, and the second switching element. The measuring position enables electrical separation of the meter from the current converter, wherein the current converter is also short-circuited via the short-circuit bridge. In this manner, the user can, for example, replace the meter or connect an external voltage to the meter to create a second circuit, which is isolated from the current converter circuit. In this manner, the meter can be tested, for example, in a defined manner.
[0010] According to an advantageous design of the invention, the detachable measuring terminal is configured to conduct current fed in via a first current converter-side lead connector through an ammeter connected between the first current converter-side lead connector and a first meter-side lead connector in a measured value test position, wherein a first operating element is in a first operating position and a second operating element is in a second operating position, wherein the first and second switching elements are not electrically connected to each other. The measured value test position provides the user with the feasibility of checking the meter by means of a measuring device, such as an ammeter. For this purpose, the user can connect the measuring device to the detachable measuring terminal in the measured value test position or already in the measured position, and move the second operating element to the second operating position. Thus, current flows from the current converter through the second switching element to the meter, through the meter, through the ammeter, and back to the current converter.
[0011] According to an advantageous design of the invention, the first and / or second actuating elements are configured as pivotable levers. This allows for simple, clear, and tactilely comfortable operation of the detachable measuring terminal. Furthermore, the user does not need to adapt to detachable terminals that are typically configured with pivotable levers. Here, unlike the prior art, the first and second actuating elements can be integrated into the same detachable measuring terminal, for example, within a common housing of the detachable measuring terminal.
[0012] Alternatively, the first and / or second actuating elements may be designed differently, for example, as sliding actuating elements or rotary actuating elements.
[0013] According to an advantageous design of the invention, the first and second actuating elements, configured as pivotable levers, can pivot about the same pivot axis or have multiple pivot axes aligned with each other. This simplifies operation for the user because the first and second actuating elements can pivot side-by-side in parallel.
[0014] According to an advantageous design of the invention, the first switching element is disposed between the pivot axis of the first operating element and the manual operating section of the first operating element.
[0015] According to an advantageous design of the invention, the second switching element is disposed between the pivot axis of the second operating element and the manual operating section of the second operating element.
[0016] According to an advantageous design of the invention, the first switching element and / or the second switching element are configured as a sector-shaped knife-type circuit breaker. This enables safe current transmission and reliable contact between the corresponding switching element and the connection contact of the disconnectable terminal for measurement. Another advantage is that this sector-shaped knife-type circuit breaker can be structurally combined with an actuating element in the form of a pivotable lever in a simple manner.
[0017] Alternatively, the pivot shaft can be positioned in the height direction of the housing between the first and second current converter side conductor connections, or between the first and second meter side conductor connections. In this case, the first switching element and / or the second switching element can be configured as a disc-shaped knife-type circuit breaker, which rotates about its central axis when the disc-shaped knife-type circuit breaker pivots. This allows for a more uniform setting of the switching paths for each contact during pivoting, thereby reducing the structural space required for the entire switching process.
[0018] According to an advantageous design of the invention, the housing has a carrier rail fastening element on the carrier rail fastening side, by means of which the detachable measuring terminal can be fastened to the carrier rail of the electrical system. This allows for simple and quick installation of the detachable measuring terminal in electrical installations, such as switch cabinets. The carrier rail fastening element can be configured, for example, as a locking element, by means of which the housing can be locked to the carrier rail.
[0019] According to an advantageous design of the invention, the first and second switching elements are arranged vertically stacked on top of each other in the height direction of the housing, the height direction extending away from the fastening side of the support rail. This allows the first and second switching elements to be integrated particularly compactly within a common housing. Here, the height direction can be used to arrange the first and second switching elements vertically stacked together, so that the disconnectable measuring terminal can be designed with a particularly narrow construction and correspondingly requires little space on the support rail.
[0020] Alternatively, the first and second switching elements can also be arranged side by side in the lateral direction.
[0021] According to an advantageous design of the invention, the short-circuit bridge is disposed between the first switching element and the second switching element in the height direction of the housing. This is advantageous for the compact integration of the short-circuit bridge and, correspondingly, for the compact, small-scale design of the entire disconnectable measuring terminal.
[0022] According to an advantageous design of the invention, first and second switching elements are disposed within the housing of the detachable measuring terminal. In this manner, the detachable measuring terminal can be designed with two levels of separation functionality within a compact housing structure.
[0023] According to an advantageous design of the invention, a first switching element and / or a second switching element are electrically coupled with connecting contacts, which establish or disconnect the electrical connection in a plug-in manner according to the switching position of the actuating element associated with the switching element. This allows for reliable connection and disconnection of the circuit via the first and second switching elements. The connecting contacts can be configured, for example, as fork-type contacts, between which knife-shaped first and / or second switching elements, such as the aforementioned fan-shaped knife-type disconnector, can be accommodated. The connecting contacts can, for example, be directly connected or connected via a bus or bus section to the first current converter side conductor connector, the second current converter side conductor connector, the first meter side conductor connector, and the second meter side conductor connector, respectively.
[0024] Alternatively, the connecting contact portion can be configured as a blade-type contact portion. In this case, the first switching element and / or the second switching element have a fork-type contact portion on the side associated with the corresponding connecting contact portion as a mating member with the blade-type contact portion.
[0025] According to an advantageous design of the invention, the detachable measuring terminal has a priority mechanism that prevents the second operating element from moving to the first operating position, provided the first operating element is in the second operating position. Therefore, the second operating element can only move to the first operating position if the first operating element has previously moved to or is already in the first operating position, or only if the first and second operating elements move to the first operating position simultaneously. This can be achieved, for example, by having the first and second manual operating sections, or other parts of the first and second operating elements, arranged sequentially in the direction of movement and preventing them from moving past each other. This arrangement avoids erroneous operation and thus prevents damage.
[0026] In the context of this invention, the indefinite term "a" should not be understood as a numeral. Therefore, if, for example, a component is referred to, it should be interpreted in the sense of "at least one component." If the angle is described in degrees, the angle refers to a circle of 360 degrees (360º). Attached Figure Description
[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The drawings show:
[0028] Figure 1 The detachable terminals for measurement are shown in a perspective view;
[0029] Figure 2 Shown in side sectional view according to Figure 1 Disconnectable terminals for measurement;
[0030] Figure 3 The side view shows the case without the housing. Figure 2 Disconnectable terminals for measurement;
[0031] Figure 4 The basis for the short circuit location is shown. Figure 3 Disconnectable terminals for measurement;
[0032] Figure 5 The basis shown in the measurement location Figure 3 Disconnectable terminals for measurement;
[0033] Figure 6 The measurement value is shown at the test location according to... Figure 3 The measurement uses disconnectable terminals. Detailed Implementation
[0034] As in Figure 1 and Figure 2 As can be seen, the detachable measuring terminal 1 has a housing 5, such as an insulating material housing. As shown, the housing 5 can be designed to open laterally and then be covered by adjacent terminals provided on the support rail. For example, by manufacturing sidewalls integrated from the housing material of the housing 5 or by placing separate sidewall members, the housing 5 can also be configured to close laterally on one or both sides.
[0035] The housing 5 has a support rail fastening side 51, and a support rail fastening element 50 is provided on the support rail fastening side. The detachable measuring terminal 1 can be fastened to the support rail of the electrical assembly by means of the support rail fastening element. The housing 5 extends in the height direction H from the support rail fastening side 51.
[0036] The measuring disconnectable terminal 1 has a current converter connection side 6, where at least one first current converter side wire connector 61 and a separate second current converter side wire connector 62 are located. The measuring disconnectable terminal 1 also has a meter connection side 7, where at least one first meter side wire connector 71 and a separate second meter side wire connector 72 (hereinafter collectively referred to as "wire connectors") are located. The wire connectors 61, 62, 71, and 72 can, for example, be configured as spring-clamping connectors, where the corresponding electrical wires 9 can be easily clamped by means of spring force. Each of the wire connectors 61, 62, 71, and 72 is connected to the connection contact 17 in the housing 5 via a busbar section 18.
[0037] The disconnectable measuring terminal 1 has a movable first switching element 10 and a movable second switching element 20 separate from the first switching element 10. The first switching element 10 is electrically insulated from the second switching element 20. The switching elements 10 and 20 can move independently of each other. The disconnectable measuring terminal 1 has a first operating element 11 coupled to the first switching element 10, which is pivotally supported at a pivot shaft 19 and extends to a position outside the housing 5, where a first manual operating section 12 is formed at the first operating element 11, where the first operating element 11 can be manually operated by the user. The disconnectable measuring terminal 1 has a second operating element 21 coupled to the second switching element 20, which is pivotally supported at a pivot shaft 19 and extends to a position outside the housing 5, where a second manual operating section 22 is formed at the second operating element 21, where the second operating element 21 can be manually operated by the user. The first actuating element 11 and the second actuating element 21 may be pivotally supported at the same pivot axis 19 or pivotally supported at multiple pivot axes 19 aligned with each other. The first switching element 10 may be rigidly connected to the first actuating element 11. The second switching element 20 may be rigidly connected to the second actuating element 21.
[0038] The first and second operating elements 11 and 21 can move back and forth between a first operating position toward the current converter connection side 6 and a second operating position toward the meter connection side 7, respectively. Figure 1 and Figure 2 The diagram shows it in the second operating position.
[0039] As can be seen, the detachable measuring terminal 1 has a short-circuit bridge 8, which is structurally integrated into the housing 5. The first switching element 10 can be electrically connected to the second switching element 20 at least in one of the first and second operating elements 11, 21 via the short-circuit bridge 8. For this purpose, the short-circuit bridge 8 can have a connection contact similar to the previously described connection contact 17, by means of which an electrical connection can be established with the corresponding first and second switching elements 10, 20.
[0040] The detachable measuring terminal 1 can have additional connectivity options, such as for connecting to test contacts 15, which can be connected to corresponding test connectors of the detachable measuring terminal 1 like probes or plug connectors. External measuring equipment or external voltage feed devices can be connected via the test contacts 15, for example.
[0041] like Figure 3 As indicated, Figure 3 and Figure 1 and Figure 2 Similarly, the detachable measuring terminal 1 is shown in the following operating position, in which the first and second operating elements 11, 21 are in a second operating position, and the current converter 2 can be connected to the first current converter side wire connector 61 and the second current converter side wire connector 62 via the electrical wire 9. Furthermore, the meter 3 can be connected to the first meter side wire connector 71 and the second meter side wire connector 72 via the electrical wire 9. Figure 3 The operating position shown is intended for the normal operation of the current converter 2 and the meter 3. In this position, the first current converter side conductor connector 61 is electrically connected to the first meter side conductor connector 71 via the first switching element 10, and the second current converter side conductor connector 62 is electrically connected to the second meter side conductor connector 72 via the second switching element 20, wherein the first and second switching elements 10 and 20 are not electrically connected to each other. Current flows from the current converter 2 to the meter 3 via the measuring disconnectable terminal 1 and flows back to the current converter via the measuring disconnectable terminal 1. Here, the meter 3 measures the current flowing through it.
[0042] Figure 4 The detachable terminal 1 for measurement is shown in the short-circuit position. As can be seen, the first operating element 11 and the second operating element 21 are in a third operating position, which may be centrally located between the first and second operating positions or at other locations between the first and second operating positions. In the short-circuit position, the current can still continue to flow as previously described in the operating position, but additionally, it is possible for the current to flow from the first switching element 10 to the second switching element 20 via the short-circuit bridge 8 and then back to the current converter 2.
[0043] Figure 5 The diagram shows a disconnectable terminal 1 for measurement in the measurement position, in which first and second operating elements 11 and 21 are in a first operating position. The measurement position allows for electrical disconnection of the meter 3 from the current converter 2, wherein the current converter 2 is also short-circuited via a first switching element 10, a short-circuit bridge 8, and a second switching element 20. In the measurement position, a test voltage can be fed into the meter 3 via a test connector 15, for example, via an electrical energy source 14, to test the meter 3 without affecting the current converter 2.
[0044] Figure 6 The detachable terminal 1 for measurement is shown in the measurement test position. Here, the first operating element 11 is in the first operating position and the second operating element 21 is in the second operating position. Here, the ammeter 4 or other measuring device is connected to the first current converter side lead connector 61 and the first meter side lead connector 71 via the test contact 15. As a result, current flows from the current converter 2 through the second switching element 20 to the meter 3, and then through the meter 3 through the ammeter 4 and back to the current converter 2.
[0045] As can also be seen in the accompanying drawings, the detachable measuring terminal 1 has a priority mechanism that prevents the second operating element 20 from moving to the first operating position as long as the first operating element 10 is in the second operating position. Therefore, the second operating element 20 can only move to the first operating position if the first operating element 10 has previously moved to or is already in the first operating position, or only if the first and second operating elements 10 and 20 move to the first operating position simultaneously. This can be achieved, for example, by arranging the first and second manual operating sections 11 and 22 sequentially in the pivoting direction and preventing them from moving past each other. This arrangement avoids erroneous operation and thus prevents damage.
[0046] List of reference numerals
[0047] 1. Disconnectable terminal for measurement
[0048] 2 Current converter
[0049] 3. Electricity meter
[0050] 4 Ampere
[0051] 5. Housing
[0052] 6 Current converter connection side
[0053] 7. Meter connection side
[0054] 8 Short-circuit bridge
[0055] 9. Wires
[0056] 10 Movable first switching element
[0057] 11 First Control Element
[0058] 12 First manual control section
[0059] 14. Electrical energy source
[0060] 15 Test Contact Part
[0061] 17 Connecting Contact Part
[0062] 18. Convergence section
[0063] 19 Pivot axis
[0064] 20 Movable second switching element
[0065] 21 Second control element
[0066] 22 Second manual control section
[0067] 50 Load-bearing rail fastening elements
[0068] 51. Bearing rail fastening side
[0069] 61 First current converter side wire connector
[0070] 62 Second current converter side wire connector
[0071] 71 First meter side wire connector
[0072] 72 Second meter side wire connector
[0073] H (height direction)
Claims
1. A detachable measuring terminal (1) for switchably connecting a current converter (2) to an electricity meter (3), wherein the detachable measuring terminal (1) has a housing (5) having a current converter connection side (6) and an electricity meter connection side (7), wherein at least one first and second current converter side wire connectors (61, 62) for connecting at least one contact of the current converter (2) are provided on the current converter connection side, and at least one first and second electricity meter side wire connectors (71, 72) for connecting at least one contact of the electricity meter (3) are provided on the electricity meter connection side, wherein the detachable measuring terminal (1) has at least one movable first switch The device comprises an element (10) and a movable second switching element (20) separate from the first switching element (10), the first switching element and the second switching element being insulated from each other, wherein the disconnectable terminal (1) for measurement has an external first operating element (11) coupled to the first switching element (10) and an external second operating element (21) coupled to the second switching element (20) separate from the external first operating element (11), wherein the external first and second operating elements (11, 21) are capable of moving independently of each other between a first operating position toward the current converter connection side (6) and a second operating position toward the meter side (7), characterized in that, The detachable terminal (1) for measurement has a short-circuit bridge (8) structurally integrated in the housing (5), and the first switching element (10) is electrically connected to the second switching element (20) via the short-circuit bridge at least in one of the first and second operating elements (11, 21).
2. The detachable terminal for measurement according to claim 1, characterized in that, The detachable terminal (1) for measuring is configured to electrically connect the first current converter side wire connector (61) to the first meter side wire connector (71) via the first switching element (10) and to the second current converter side wire connector (62) to the second meter side wire connector (72) via the second switching element (20) in the operating position, wherein the first and second operating elements (11, 21) are in the second operating position, wherein the first and second switching elements (10, 20) are not electrically connected to each other.
3. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The measuring disconnectable terminal (1) is configured to electrically connect the first current converter side conductor connector (61) to the first meter side conductor connector (71) via the first switching element (10) in a short-circuit position, and to electrically connect the second current converter side conductor connector (62) to the second meter side conductor connector (72) via the second switching element (20), and additionally to electrically connect the first switching element (10) to the second switching element (20) via the short-circuit bridge (8), wherein the first and second operating elements (11, 21) are in a third operating position, the third operating position being between the first operating position and the second operating position.
4. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The detachable terminal (1) for measurement is configured to electrically disconnect the first current converter side lead connector (61) from the first meter side lead connector (71) via the first switching element (10) and electrically disconnect the second current converter side lead connector (62) from the second meter side lead connector (72) via the second switching element (20) and additionally electrically connect the first switching element (10) and the second switching element (20) via the short-circuit bridge (8) in the measurement position, wherein the first and second operating elements (11, 21) are in the first operating position, wherein the first current converter side lead connector (61) is electrically connected to the second current converter side lead connector (62) via the short-circuit bridge (8), the first switching element (10) and the second switching element (20).
5. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The disconnectable terminal (1) for measuring is configured to conduct current fed in via the first current converter side conductor connector (61) via an ammeter (4) connected between the first current converter side conductor connector (61) and the first meter side conductor connector (71) in the measurement value test position, wherein the first operating element (11) is in the first operating position and the second operating element (21) is in the second operating position, wherein the first and second switching elements (10, 20) are not electrically connected to each other.
6. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The first actuating element (11) and / or the second actuating element (21) are configured as pivotable levers.
7. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The first switching element (10) and / or the second switching element (20) are configured as a fan-shaped knife-type disconnector.
8. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The housing (5) has a bearing rail fastening element (50) on the bearing rail fastening side (51), and the detachable measuring terminal (1) can be fastened to the bearing rail of the electric device by means of the bearing rail fastening element.
9. The detachable terminal for measurement according to claim 8, characterized in that, The first and second switching elements (10, 20) are arranged vertically stacked along the height direction (H) of the housing (5), which extends away from the bearing rail fastening side (51).
10. The detachable terminal for measurement according to claim 8 or 9, characterized in that, The short-circuit bridge (8) is disposed between the first switching element (10) and the second switching element (20) in the height direction (H) of the housing (5), which extends away from the bearing rail fastening side (51).
11. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The first and second switching elements (10, 20) are disposed in the housing (5) of the detachable measuring terminal (1).
12. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The first switching element (10) and / or the second switching element (20) are electrically connected together with the connecting contact, which establishes or disconnects the electrical connection by inserting the contact according to the switching position of the operating element (11, 21) associated with the switching element (10, 20).
13. The detachable measuring terminal according to any one of the preceding claims, characterized in that, The detachable terminal (1) for measurement has a priority mechanism that prevents the second operating element (21) from moving to the first operating position as long as the first operating element (11) is in the second operating position.