Current socket for detachable connection with a current plug as well as current coupling consisting of such a current socket as well as an associated current plug

Abstract

: The invention relates to a power jack (1) for releasable connection to a power plug (30), with a main body (2) made of electrically conductive material with a bore (2') for receiving a substantially cylindrical pin (31) of the power plug (30) and with a device (4) for connection to a power cable (40), wherein a helical groove (5) for receiving a locking nose (32) of the power plug (30) is arranged in the main body (2), wherein the main body (2) of the power jack (1) has a sleeve (3) with the helical groove (5) and a receptacle (3') for the sleeve (3). The invention also relates to a power coupling (50) having such a power jack (1) and an associated power plug (30). According to the invention, the helical groove (5) has at least two regions (a, c) with positive slope, and at the end of each region (a, c) with positive slope regions (b, d) with negative slope are arranged to form in each case a latching stage, and the receptacle (3') is made of metal or a metal alloy with a sheath (13) of electrically insulating material and the sleeve (3) is formed from harder material than the receptacle (3').

Description

[0001] The invention relates to a power coupling comprising a power socket and an associated power plug with a substantially cylindrical pin, wherein the power socket is designed for detachable connection with the power plug, with a base body made of electrically conductive material with a bore for receiving the substantially cylindrical pin of the power plug and with a device for connection to a power cable, wherein a helical groove for receiving a locking lug of the power plug is arranged in the base body, wherein the base body has a sleeve with the helical groove and a receptacle for the sleeve.

[0002] The term "essentially cylindrical" is intended to clarify that the bore in the base of the power socket, as well as the pin of a matching power plug, may deviate slightly from the rotationally symmetrical shape and may, for example, be slightly eccentric.

[0003] These types of electrical sockets, together with matching electrical plugs, form electrical couplings designed to transmit high currents of up to several hundred amperes. For example, such couplings are used in welding systems to conduct high welding currents from the welding power source to the welding torch and the workpiece. The standard DIN EN 60974-12 "Plug-in connectors for welding cables" exists for these connections, which are common in welding technology. However, these electrical sockets can also be used in other applications, such as photovoltaic systems or battery chargers, as part of corresponding electrical couplings to transmit the direct current from solar modules or the charging current for charging batteries.

[0004] In welding systems, connectors from DINSE Ges.mbH are very frequently used for power cable couplings and hose assembly couplings. These are known to welding professionals as DINSE® plugs, DINSE® sockets, or DINSE® connectors. With a DINSE® connector, a plug with a locking lug is screwed into a socket with a helical groove of approximately 270° rotation and a pitch of about 4 mm per 360°. The thread-like interaction between the plug and socket results in a certain preload force or tightening torque of the connection, or a corresponding axial force, which holds the connection securely in place. Depending on the current rating, the plugs and sockets have different cross-sections.

[0005] In gas metal arc welding (GMAW) and plasma welding systems, the shielding gas or plasma-capable medium is also guided through appropriate channels in the center of the current coupling.

[0006] The relatively steep pitch of the helical groove in state-of-the-art electrical sockets, combined with a short preload length (the length of the connection running from the electrical contact surface between the plug and socket to the locking tab of the plug) and a large preload area (the area of ​​the socket or the plug's pin cross-section that is subjected to force), results in an extremely steep preload characteristic, i.e., a high slope in the force-displacement curve of the connection. This means that the energy required to disconnect the connection, i.e., to detach the plug from the socket, is very low, and even temperature fluctuations or vibrations can lead to unintentional disconnection. Once the connection loses its preload, the contact resistance of the electrical coupling increases rapidly.This can lead to local overheating at the connection between the power socket and plug when transmitting sufficiently high currents, which in turn can cause parts of the power cable and connector to oxidize. An oxidized connector, in turn, increases operating temperatures, which can lead to the destruction of the plastic components of the plug and socket, the connected power cable, and the connected device, such as a welding power source. If prescribed temperature limits are significantly exceeded, injury to operating personnel cannot be ruled out. Furthermore, an increase in the contact resistance of the connector can negatively affect the respective process, such as the welding process, and even lead to defective production.

[0007] To improve the contact resistance of the electrical coupling, electrical sockets were further developed by significantly increasing the release energy or release torque of the connection through a spring-loaded locking lug on the plug. Such an electrical coupling is described, for example, in WO 2016 / 128557 A1, where the electrical plug of the coupling has a slidingly mounted locking pin that is held in a home position by a spring mechanism. Besides the increased design complexity and the resulting higher manufacturing costs, a disadvantage of this plug is that the design in the center of the electrical plug makes it difficult or impossible to create an axial bore or cavity for gas passage.Finally, it is also a disadvantage that the solution complexity is located in the power plug, which is usually exposed to harsher environmental conditions than the socket and is also located in the more price-sensitive part of the power coupling.

[0008] DE 10 2018 007 686 A1 describes a welding power cable for connection to a welding power source, whereby the risk of the power plug unintentionally detaching from the power socket due to torsion is reduced by a bayonet element with a bayonet locking device.

[0009] FR 2 270 695 A1 discloses a power socket of the type in question, wherein the base body has a sleeve with the helical groove and a receptacle for the sleeve.

[0010] The object of the present invention is to create a current socket of the aforementioned type for couplings for transmitting high currents of up to several hundred amps, such as those that can occur, for example, in welding systems, photovoltaic systems, or battery chargers. This socket should ensure the lowest possible contact resistance and thus optimal current transfer, while preventing or at least minimizing the risk of local overheating of the socket and plug due to excessively high current densities. The current socket should be as simple and cost-effective to manufacture as possible and should also allow for the routing of a shielding gas or similar material in its center. Disadvantages of known current sockets should be avoided or reduced.

[0011] The problem according to the invention is solved by a current coupling as described above, wherein the helical groove of the base body of the current socket has at least two areas with a positive pitch, and at the end of each area with a positive pitch, areas with a negative pitch are arranged to form a detent step, wherein the receptacle is made of metal or a metal alloy with a covering of electrically insulating material, and the sleeve is made of a harder material than the receptacle and the cylindrical pin of the current plug. By separating the base body into at least two parts, the sleeve with the helical groove and a receptacle for the sleeve, the parts can be manufactured from different materials, and further advantages can be achieved, which are described below.By incorporating a helical groove in the socket sleeve with at least two positively inclined sections and negatively inclined sections at the end of each positively inclined section, the operator receives haptic feedback upon reaching the respective locking position. Furthermore, this design allows for a higher release torque than the tightening torque, thus preventing the electrical connector from being unintentionally disconnected. The inclusion of at least two locking positions also ensures that even a worn electrical plug can still be securely locked in the socket by selecting the second or subsequent locking position. This involves rotating the plug further relative to the socket after reaching the first locking position and then holding it securely in the next or subsequent locking position.Due to the improved connection of the electrical coupling, the contact resistance can also be reduced, thus minimizing the risk of damage to or impairment of the socket, plug, cable, or associated equipment, as well as the risk of injury from overheating and negative impacts on the respective process, such as welding. The design of the socket allows for connection with conventional plugs, such as the DINSE® plugs mentioned above, and does not require the replacement of plugs on conventional components, such as welding components. A further advantage of this socket is that the space around its central axis can be kept clear of structural elements, allowing for a bore or cavity in the center of the socket, for example, to guide a shielding gas, a plasma-compatible medium, a welding wire, or similar components.This can be easily provided for. Because the technical features for solving the problem according to the invention are arranged in the power socket, the associated costs can be shifted from the more cost-sensitive part of the power coupling, the power plug, to the power socket. Furthermore, the power socket is usually located in the respective device, for example, in the welding power source, and is less exposed to harsh environmental conditions than the power plug. Moreover, the necessary design modifications to the power socket are relatively simple and inexpensive to implement.

[0012] If a spring element is arranged in the receptacle for the sleeve of the socket's base body to provide resilient support for the sleeve in the axial direction of the receptacle, and if the spring element is preferably formed by at least one wire spring washer, and particularly preferably by two wire spring washer washer and a spacer ring arranged between the wire spring washer washer, a further improvement in the connection between the socket and plug can be achieved, resulting in a lower contact resistance of the electrical coupling. The spring force allows the release torque to be further increased relative to the tightening torque of the connector, thus further reducing the risk of the plug unintentionally disconnecting from the socket. Thermal cycles, vibrations, and impacts can no longer loosen the connector.By selecting the appropriate spring element, the contact force of the electrical connection and thus the contact resistance can be influenced. The force acting on the contact surface can be adjusted at each detent position via the spring element. A force acting on the contact surface of 5 to 50 N / mm² is preferred.

[0013] Preferably, the spring element is formed by at least one wire spring washer. Such a wire spring washer can be manufactured very cost-effectively using a corrugated flat wire and can be arranged in the power socket in a particularly space-saving manner without requiring the central area of ​​the socket, thus freeing it up for the purpose of conveying a shielding gas or the like.

[0014] The spring element is preferably formed by two wire spring discs and a spacer ring arranged between them. The spacer ring prevents the spring travel of the wire spring discs arranged on either side from being reduced by rotation of the wire spring discs relative to each other, thus allowing the full spring force of the wire spring discs to be utilized.

[0015] Because the sleeve of the power socket is made of a harder material than the receptacle and the cylindrical bolt of the power plug, wear occurs preferably on the softer power plug and not on the harder sleeve of the power socket.

[0016] Ideally, the sleeve of the power socket's base body features positioning elements, particularly axial locking lugs, to prevent rotation relative to the base body's receptacle. Such positioning elements on the sleeve are easy to implement and do not significantly increase manufacturing costs.

[0017] The socket housing can consist of two connectable parts, preferably joined by an interference fit. This allows for quick and easy assembly of the socket by simply placing the necessary components—the sleeve and any spring elements—in designated positions on the socket housing parts and then connecting them. The two socket housing parts are preferably joined by an interference fit. Alternatively, the socket housing parts can also be detachably connected, for example, by a screw connection with a left- or right-hand thread.

[0018] The base of the power socket can be made of steel or a steel alloy, or of brass or a brass alloy.

[0019] The sleeve of the power socket is preferably made of steel or a steel alloy. This has the advantage that wear occurs primarily on the softer power plug and not on the harder sleeve of the power socket.

[0020] The socket's receptacle features a flat end face for optimal current transfer to the power plug. This flat design ensures a uniformly low contact resistance across the entire contact area. Areas of higher contact resistance, which could lead to localized overheating due to particularly high current densities, are thus prevented. If a protective gas or similar is passed through the socket, the area around the central axis is recessed, and the end face is therefore preferably annular in shape.

[0021] To improve current transfer, the end face of the base body's receptacle can have a coating, for example, a silver coating. Zinc or gold coatings are also possible for low contact resistance. Phosphate coatings, possibly in combination with other chemical substances, protect the contact surface from corrosion.

[0022] According to a feature of the invention, the groove in the sleeve of the base body of the power socket extends over a rotation angle of 90° to 270°. Such rotation angles are suitable for handling the power coupling.

[0023] The pitch of the groove sections in the sleeve of the power socket's base body with a positive pitch is ideally between 1 mm and 8 mm per 360°. These values ​​ensure a proper connection between the power socket and a matching power plug with a locking lug. The pitch of the helical groove with a positive pitch does not necessarily have to be constant; it can also be graduated, i.e., it can increase or decrease in height.

[0024] The pitch of the groove sections in the sleeve of the power socket's base body, which form the detent steps, has a negative pitch between 0.1 mm and 20 mm, preferably between 1 mm and 20 mm, and most preferably between 5 mm and 20 mm per 360°. By providing these negative-pitch sections, the loosening torque can be increased even further compared to the tightening torque, and the haptic feedback to the user when the detent steps are reached can be improved. As mentioned above for the positive-pitch sections, the pitch of the helical groove sections in the sleeve can also be graded.

[0025] According to a further feature of the invention, the helical groove in the sleeve of the base body of the power socket can have areas without a slope or with negligible slope following the areas with a negative slope. A smooth transition between these areas of the helical groove can be achieved by means of a gradation between the areas with a negative slope and the areas without a slope. Such transitions can positively influence the user's haptic perception.

[0026] In its simplest form, the connection to a power cable can be made using a screw connection. This represents a simple and cost-effective way to connect the power cable to the power socket.

[0027] If the socket's base body has a continuous bore or similar feature in the axial direction for guiding a protective gas or similar substance, a protective gas or plasma-capable medium can be guided through the electrical contact. Instead of a rotationally symmetrical bore, a differently shaped cavity can also be provided in the base body's base body for guiding the protective gas or similar substance in the axial direction.

[0028] The present invention is explained in more detail with reference to the accompanying drawings. These show: Fig. 1 shows a power coupling consisting of a power socket and a power plug according to the prior art in a separated state; Fig. 2 shows a sectional view through a prior art power coupling according to Fig. 1 with connected power plug and power socket; Fig. 3 an exploded view of a power socket designed according to the invention; Figs. 4A to 4D detailed views of the sleeve of an embodiment of a power socket; Fig. 5 a sectional view through a power socket; Fig. 6 a sectional view through a power coupling with the power plug not yet engaged in the power socket; Fig. 7 the sectional view through the power coupling according to Fig. 6 with the power plug locked into the power socket; Fig. 8 a force-displacement preload diagram of a power coupling with a power socket designed according to the invention compared to a power coupling with a conventional power socket; and Fig. 9 the contact resistance and the power loss of a power coupling with a power socket designed according to the invention compared to power couplings with conventional plug connections.

[0029] In Fig. 1 A current coupling 50, consisting of a power socket 1 and a power plug 30, is shown in a separate state according to the prior art. The power plug 30 has, in addition to a base body (not described in detail), appropriate insulation, and a connection device for the power cable 40, a substantially cylindrical bolt 31 made of electrically conductive material with a locking lug 32. The power socket 1, for detachable connection with the power plug 30, has a base body 2 made of electrically conductive material with a bore 2' for receiving the bolt 31 of the power plug 30. The power socket 1 also has a connection device 4 (not described in detail) for the power cable 40, for example, a screw connection (see Figure 1). Fig. 2 The base body 2 of the power socket 1 has a helical groove 5 for receiving the locking lug 32 of the power plug 30. To connect the power plug 30 to the power socket 1, the essentially cylindrical pin 31 of the power plug 30 is inserted into the bore 2' of the base body 2 of the power socket 1 such that the locking lug 32 engages in the groove 5. The power plug 30 then rotates relative to the power socket 1 according to the path of the helical groove 5 in the base body 2 of the power socket 1 (not shown). Nevertheless, the release torque is usually low, and unintentional disconnection of the power plug 30 from the power socket 1 of the power coupling 50 is likely. The risk of disconnection is increased by temperature fluctuations or mechanical forces acting on the components of the power coupling 50.The increase in contact resistance that occurs when the connection is disconnected can lead to local overheating of the power plug 30, the power socket 1, and / or the power cable 40, and to the destruction of parts of these components. Although the situation can be improved, for example, by a spring-loaded locking lug 32, unintentional disconnection of the plug connection still cannot be completely ruled out.

[0030] Fig. 2 shows a cross-sectional view through a current coupling 50 of the state of the art according to Fig. 1 with connected power plug 30 and power socket 1. Here it can be seen how the locking lug 32 on the essentially cylindrical bolt 31 of the power plug 30 projects into the helical groove 5 in the base body 2 of the power socket 1. Additionally, the device 4 for connecting to the power cable 40 in the power socket 1 is visible in the form of a screw connection 16. The power socket 1 has a covering 13 made of electrically insulating material.

[0031] Fig. 3 Figure 1 shows an exploded view of a power socket 1 designed according to the invention. The power socket 1 has a base body 2 made of electrically conductive material with a sleeve 3 having a helical groove 5 and a receptacle 3' for the sleeve 3. In the illustrated embodiment, the receptacle 3' for the sleeve 3 consists of two connectable parts 11, 12. The parts 11, 12 of the receptacle 3' of the base body 2 are, for example, made of brass or a brass alloy and have a covering 13 made of electrically insulating material (not shown here). The sleeve 3 is preferably made of a harder material than the receptacle 3', for example, steel or a steel alloy.

[0032] The essentially cylindrical sleeve 3 serves to receive the essentially cylindrical bolt 31 of the power plug 30 (not shown). To prevent rotation of the sleeve 3 relative to the receptacle 3' of the base body 2, positioning elements 9, in particular axial locking lugs 10, are arranged on the sleeve 3, which project into corresponding recesses 18 in the part 11 of the receptacle 3' of the base body 2. The device 4 for connection to a power cable 40, for example a screw connection 16, is not shown in detail. A helical groove 5 for receiving the locking lug 32 of the power plug 30 is arranged in the sleeve 3, wherein the helical groove 5 has at least two regions a, c with a positive pitch, and at the end of each region a, c with a positive pitch, regions b, d with a negative pitch are arranged to form a locking step (see Fig. 4A ).

[0033] Optionally, a spring element 6 can be arranged in the base body 2 for the resilient mounting of the sleeve 3 in the axial direction X of the receptacle 3' of the base body 2, which in the illustrated example is formed by two wire spring washers 7 and two spacer rings 8. This increases the holding force in the locked state and thus prevents or makes it more difficult for the connection to loosen unintentionally.

[0034] From the detailed representation of the unwound sheath of the sleeve 3 of an embodiment of a power socket 1 according to Fig. 4A as well as three different views of sleeve 3 according to the Fig. 4B bis 4D The design of the helical groove 5 is now more clearly visible. Accordingly, the helical groove 5 in the sleeve 3 has at least two areas a, c with a positive slope, with areas b, d with a negative slope at the end of the areas a, c with a positive slope forming a detent step, as well as areas e with no or negligible slope. Thus, the sleeve 3 shown provides two detent steps. By providing the helical groove 5 in the sleeve 3 of the power socket 1 with at least two areas a, c with a positive slope and by arranging areas b, d with a negative slope at the end of each area a, c with a positive slope, the operator receives haptic feedback upon reaching the respective detent step. For a defined engagement, there can be areas e with no or negligible slope between the areas a, c with a positive slope and the areas b, d with a negative slope.These areas e, with no or negligible slope, are not strictly necessary. Furthermore, it is possible for areas a and c to have a positive slope and areas b and d to have a negative slope, meaning their slope is not necessarily constant but can, for example, increase or decrease.

[0035] Fig. 5 shows a cross-sectional view through a power socket 1 according to Fig. 3 in the assembled state. Accordingly, the two parts 11, 12 of the receptacle 3' of the base body 2 of the power socket 1 are connected to each other, for example, by crimping. Inside the receptacle 3' of the base body 2, the sleeve 3 is arranged and is axially displaceable relative to the receptacle 3' by a spring element 6 in the form of two wire spring washers 7 and two spacer rings 8. This allows an increased force to be exerted on the end face 14 of the receptacle 3' when the power socket 1 is connected to the power plug 30. A coating 15, for example made of silver, can be arranged on the end face 14 of the receptacle 3' of the base body 2, which further reduces the contact resistance RÜ and also protects against corrosion.

[0036] Fig. 6 Figure 1 shows a cross-sectional view through a current coupling 50 with the current plug 30 not yet engaged in the current socket 1. Accordingly, the two wire spring discs 7 of the spring element 6 are relaxed. The current plug 30 has a through bore 17 for guiding a protective gas or the like in the receptacle 3' of the base body 2, which extends axially X into the current socket 1.

[0037] In Fig. 7 The cross-sectional view through the power coupling 50 is according to Fig. 6 The diagram shows the current plug 30 being engaged in the power socket 1. In this case, the wire spring washers 7 of the spring element 6 are compressed, and the spring force is accordingly transferred to the end face 14 of the receptacle 3' of the base body 2 of the power socket 1. This reduces the contact resistance R Ü of the connection of the current coupling 50.

[0038] Fig. 8 Figure 1 shows a force-displacement preload diagram of a current connector 50 with a current socket 1 designed according to the invention and featuring two detent positions (curve C) compared to a current connector 50 with a conventional current socket 1 (curves A and B). The force F in N is plotted against the displacement s in mm. In a conventional connector, for example, a common DINSE® connector (curve A), the force F has a very steep curve as a function of displacement s. The curves for closing and opening the connector are essentially the same. In a further development of the connector with a spring-loaded locking lug (curve B), the force F has a flatter curve as a function of displacement s. The force F curve for releasing the connection is lower than the force F curve for closing the connector. Accordingly, the release torque is lower than the tightening torque.In the electrical connector 50 with a current socket 1 according to the invention (curve C), a force-displacement curve results which, due to the above-described course of the helical groove 5 in the sleeve 3 with two areas of negative slope, has two detent positions. In the locked state of the connector, a lower force F results in each detent position. Accordingly, a certain force F must be overcome to open the connection or to detach the electrical plug 30 from the current socket 1 according to the invention. This leads to a better hold of the connector, which significantly reduces the risk of unintentional disconnection of the connector.

[0039] Finally, it shows Fig. 9For example, the contact resistance RÜ and the power loss PV of a current connector 50 with a current socket 1 designed according to the invention (bar charts I) are compared to current connectors 50 with conventional connectors (bar charts II to IV). The bar charts according to I show the contact resistance RÜ and the power loss PV of a current connector 50 with the current socket 1 according to the invention. Both the contact resistance RÜ and the power loss PV are low values. The bar charts according to II show the contact resistance RÜ and the power loss PV for a fixed, optimal connection of a conventional DINSE® connector. The values ​​for the contact resistance RÜ and the power loss PV are comparable to those of the current socket 1 according to the invention according to I and are, for example, a few tens of µΩ and a few watts, respectively.With a loose DINSE® connector (bar charts according to III), the contact resistance RÜ and the power loss PV increase sharply, for example to over 100 µΩ or several tens of watts. The bar charts according to IV show the case of a loose DINSE® connector that is also oxidized. Accordingly, the contact resistance RÜ and the power loss PV increase sharply, for example to several hundred µΩ or about 100 W. Such values ​​can lead to the destruction of the power coupling 50 due to local overheating. In contrast, the power socket 1 according to the invention ensures an optimal, stable, and permanent connection with minimal contact resistance RÜ and minimal power loss PV, thereby largely reducing the risk of damage to the components of the power coupling 50, the power cables 40, and connected devices, as well as the risk of injury to users.

Claims

1. Electrical power coupling (50) consisting of an electrical power jack (1) and an associated electrical power plug (30) with an essentially cylindrical pin (31), the electrical power jack (1) being designed for detachable connection to the electrical power plug (30), with a base body (2) made of electrically conductive material with a bore (2') for accommodating the essentially cylindrical pin (31) of the electrical power plug (30) and with a device (4) for connection to a power cable (40), wherein a helical groove (5) for insertion of a locking nose (32) of the electrical power plug (30) is arranged in the base body (2), the base body (2) comprising a bushing (3) with the helical groove (5) and a receptacle (3') for the bushing (3), characterized in that the helical groove (5) of the base body (2) of the electrical power jack (1) comprises at least two areas (a, c) with a positive gradient, and at the end of each area (a, c) with a positive gradient areas (b, d) with a negative gradient are arranged to form a respective latching step, wherein the receptacle (3') is formed from metal or a metal alloy with an enclosure (13) of electrically insulating material and the bushing (3) is formed from a harder material than the receptacle (3') and than the cylindrical pin (31) of the electrical power plug (30).

2. Electrical power coupling (50) according to claim 1, characterized in that a spring element (6) is arranged in the receptacle (3') for the bushing (3) of the base body (2) of the electrical power jack (1) for spring-mounted support of the bushing (3) in the axial direction (X) of the receptacle (3'), and in that the spring element (6) is preferably formed by at least one wire spring washer (7), particularly preferably by two wire spring washers (7) and a spacer ring (8) arranged between the wire spring washers (7).

3. Electrical power coupling (50) according to claim 1 or 2, characterized in that the bushing (3) of the base body (2) of the electrical power jack (1) comprises positioning elements (9), in particular axial latching noses (10), to prevent torsion relative to the receptacle (3') of the base body (2).

4. Electrical power coupling (50) according to one of claims 1 to 3, characterized in that the receptacle (3') of the base body (2) of the electrical power jack (1) consists of two parts (11, 12) which can be connected to one another, the two parts (11, 12) of the receptacle (3') of the base body (2) preferably being connectable to one another via an interference fit.

5. Electrical power coupling (50) according to one of claims 1 to 4, characterized in that the receptacle (3') of the base body (2) of the electrical power jack (1) is formed from steel or a steel alloy, preferably from brass or a brass alloy, and in that the bushing (3) is formed from steel or a steel alloy.

6. Electrical power coupling (50) according to one of claims 1 to 5, characterized in that the receptacle (3') of the base body (2) of the electrical power jack (1) comprises a flat front face (14) for contacting.

7. Electrical power coupling (50) according to claim 6, characterized in that the front face (14) of the receptacle (3') of the base body (2) of the electrical power jack (1) comprises a coating (15), for example a silver coating.

8. Electrical power coupling (50) according to one of claims 1 to 7, characterized in that the groove (5) in the bushing (3) of the base body (2) of the electrical power jack (1) extends over a rotational angle (→) of 90° to 270°.

9. Electrical power coupling (50) according to one of the claims 1 to 8, characterized in that the gradient of the areas (a, c) of the groove (5) in the bushing (3) of the base body (2) of the electrical power jack (1) with positive gradient is between 1 mm and 8 mm per 360°.

10. Electrical power coupling (50) according to one of claims 1 to 9, characterized in that the gradient of the areas (b, d) of the groove (5) in the bushing (3) of the base body (2) of the electrical power jack (1) with negative gradient for forming the latching steps is between 0.1 mm and 20 mm, preferably between 1 mm and 20 mm, particularly preferably between 5 mm and 20 mm per 360°.

11. Electrical power coupling (50) according to one of claims 1 to 10, characterized in that the helical groove (5) in the bushing (3) of the base body (2) of the electrical power jack (1) comprises areas (e) without gradient after the areas (b, d) with negative gradient.

12. Electrical power coupling (50) according to one of claims 1 to 11, characterized in that the device (4) for connection to a power cable (40) is formed by a screw joint (16).

13. Electrical power coupling (50) according to one of claims 1 to 12, characterized in that the receptacle (3') of the base body (2) of the electrical power jack (1) comprises a through hole (17) or the like in axial direction (X) for guiding a shielding gas (S) or the like.

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