DE202017102941U1 - Measuring device for the inductive measurement of a voltage in an overhead line - Google Patents

Abstract

Measuring device (1) for the inductive measurement of an electric current in an overhead line (X) extending overhead line (16), wherein the measuring device (1) comprises a two-part measuring core with a first sub-core (18) and a second sub-core (19), the form in a closed position of the measuring core a receiving space for receiving the overhead line (16), wherein in the closed position of the measuring core, the overhead line (16) radially with respect to the extension axis (X) fully encloses, wherein the first part of core (18) via a movable ausgestaltetes actuating means ( 4) within a movement path (T) from the closed position into an open position is transferred or vice versa, wherein the actuating means (4) along a direction perpendicular to the extension axis (X) of the overhead line (16) extending movement axis (B) is movable, wherein in the open position the partial cores (18, 19) are spaced apart from one another such that the overhead line (16) in the Au receiving space of the measuring core is receivable, characterized in that for the transfer from the open position to the closed position or vice versa, a two-stage transmission is provided, wherein the transmission as a first gear stage, the actuating means (4) and as a second gear stage comprises a linkage (5) in which the articulated transmission (5) is connected to the first part core (18) and a plurality of levers (2, 9, 10) designed to be movable in rotation about axes (A, C, D, E, F, G) transverse to the movement axis (B) , 11), wherein the linkage (5) is designed such that the movement path (T) of the actuating means (4) from the open position to the closed position is smaller than a via the linkage (5) to the first part of the core (18) transmitted Clamping path (S) for transferring the first part of the core (18) from the open position to the closed position for fixing the overhead line (16).

Description

The invention relates to a measuring device for the inductive measurement of an electric current in an overhead line extending along an extension axis, wherein the measuring device has a two-part measuring core with a first sub-core and a second sub-core. The split cores form in a closed position of the measuring core a receiving space for receiving the overhead line. In the closed position of the measuring core encloses the overhead line radially with respect to the extension axis fully. The first sub-core can be transferred via a movably configured actuating means within a movement path from the closed position to an open position or vice versa, wherein the actuating means is movable along a movement axis extending perpendicular to the extension axis of the overhead line. In the open position, the split cores are spaced apart from one another such that the overhead line can be received in the receiving space of the measuring core.

The measuring devices of the type mentioned above are used for supply and measuring devices, which are used for locating and displaying errors and for transmitting error messages in live networks with overhead lines. The measuring devices are attached to current-carrying electrical lines, in particular overhead lines, in order to inductively draw current from the electrical line via a measuring core. An overhead line is an electrical line carried by overhead pylons and held to the overhead tower by insulators.

For measurement on an overhead line, the measuring device for the purpose of security on a long rod of electrically insulating material, for. B. with a length of two meters, attached and is operated on this.

A measuring device of the type mentioned, in which the partial cores are transferred by a screw from the open position to the closed position, z. B. from the US 8,536,857 B2 known. However, a measuring device of this type has the disadvantage that the merging or diverging the split cores by the screwing is time consuming.

The invention has for its object to provide a measuring device is available, which is improved over the prior art. In particular, a measuring device is to be made available, which enables a time-efficient merging of the legs.

The object is solved by the characterizing part of claim 1. According to the invention, a two-stage transmission is provided for the transfer from the open position to the closed position or vice versa, wherein the transmission has the actuating means as a first gear stage and a linkage as a second gear stage, wherein the linkage is connected to the first part core and a plurality of transversely to the Moving axis extending axes has rotatably formed lever, wherein the linkage is designed such that the movement path of the actuating means from the open position to the closed position is smaller than a transmitted via the linkage to the first sub-core clamping path for transferring the first sub-core from the open position to the closed position for fixing the overhead line. The measuring device according to the invention has the advantage that the partial cores are brought together more quickly compared to measuring devices of the type mentioned, so that even thicker electrical lines can be quickly enclosed in the closed position of the measuring core.

According to a preferred embodiment of the invention it is provided that the linkage is designed such that the actuating means along the axis of movement travels the path of movement, which to the clamping path of the first sub-core, in particular the remote from a pivot axis of the sub-cores contact surface of the first sub-core, a ratio in a range of S: T> 1 to S: T <5, preferably has a ratio of S: T = 1.3. There is thus the advantage that the force to be applied to the actuating means for transferring the first sub-core from the open position to the closed position or vice versa is in a range which allows a user to manually operate the actuating means without much effort.

In particular, in the closed position of the first sub-core and the second sub-core over mutually facing contact surfaces to each other, wherein the pivot axis of the first sub-core is held in a slot which is configured such that the first sub-core with its contact surfaces in the transfer of the open position in the closed position or vice versa at a distance between the contact surfaces of the two partial cores less than / equal to the radial length of the contact surfaces of the first partial core is aligned at an angle in a range of 0 ° to 15 ° to the contact surfaces of the second partial core. Thus, the probability can be reduced that the contact surfaces of the split cores are mechanically damaged.

Preferably, a clamping means is provided, which exerts a restoring force on the first partial core in the direction of the second partial core in the closed position of the measuring core. The clamping means causes in this way that the contact surfaces the partial cores lie on one another in the closed position, so that the inductive measurement of the current takes place with lower measurement errors. Furthermore, a game of the transmission can be compensated, which has the advantage that the contact surfaces of the split cores do not rub against each other in the closed position, whereby they could be damaged.

It is preferably provided that the restoring force of the clamping means corresponds to a lifting force acting through the linkage in the direction of the second partial core. This has the advantage that the clamping means supports the transmission in the transfer of the first part of the core from the open position to the closed position, so that a user can operate the actuating means easier.

In particular, in the closed position of the measuring core, the clamping means protrudes into the receiving space of the measuring core with a clamping section for clamping the overhead line. Thus, the overhead line can be held in the closed position by the clamping means. There is no additional measure necessary to keep the overhead line in the receiving space of the measuring core. If the two partial cores of the measuring core are transferred to the closed position, consequently, a measurement of the current can take place immediately.

Preferably, the actuating means as a, preferably rotatably about the movement axis, movable rod is formed, which is immovably connected at a first end to the second part of core and at a first end opposite the second end, in particular via a support, with the linkage. Particularly preferably it is provided that the actuating means is a rotatable about the axis of rotation threaded rod, which is rotatably guided with an outer thread formed on its outer circumference in an internal thread of a guide element, wherein the guide element is immovably connected to the second part of the core. This is a simple and inexpensive embodiment of the actuating means.

Preferably, the actuating means, in particular on the support, with at least one off-center on a rocker axis movably mounted rocker arm as part of the joint mechanism movably connected, wherein the rocker arm has a respect to the rocker axis longer leg part and with respect to the rocker axis shorter leg part, the rocker arm on his Rocker axis is mounted longitudinally displaceable over the actuating means along the axis of movement. The rocker arm has the advantage that the first part core can be moved on the one hand for transferring from the open position into the closed position and vice versa quickly in the direction of the second part core over a first, larger path section. Thus, the first sub-core can be moved sufficiently fast in the direction of the second sub-core, so that the overhead line is enclosed over a large part of its circumference and can not fall out of the receiving space of the measuring core. On the other hand, with a smaller distance between the contact surfaces of the measuring cores, the partial cores can be slowly moved towards each other. This reduces the likelihood that the surfaces of the sections will be damaged, which would affect the functionality of the measuring core.

In particular, it is provided that the rocker arm is rotatably connected at its two movable relative to the rocker axis each with a lever arm as parts of the joint gear, wherein the lever arms extend crosswise in the direction of the first sub-core and are connected to the first sub-core, that a movement of the rocker arm about the rocking axis causes an opposite movement of the first part of the core about the pivot axis. Particularly preferably, the longer partial leg of the rocker arm with at least one, in particular shorter, first lever arm is rotatably connected about a first lever axis, wherein the first lever arm is rotatably connected to the first part of the core via a first axis of rotation in a region near the pivot axis, and the shorter leg part the rocker arm is rotatably connected to at least one, in particular longer, second lever arm about a second lever axis, wherein the second lever arm is rotatably connected to the first part core in a region remote from the pivot axis via a second axis of rotation. This arrangement of levers is advantageously mechanically stable and not susceptible to errors.

Further advantageous embodiments of the invention are contained in the subclaims. The invention will be explained in more detail with reference to the description of the figures with regard to their mode of action and their advantages.

Show it:

1 a measuring device according to the invention in the closed position with a thicker overhead line in its receiving space,

2a a measuring device according to the invention in an open position without overhead line,

2 B a measuring device according to the invention in a first intermediate position without overhead line,

2c a measuring device according to the invention in a second intermediate position without overhead line,

2d a measuring device according to the invention in a closed position without overhead line and

3 a measuring device according to the invention in the closed position with a thinner overhead line in its receiving space.

In the various figures of the drawing, like parts are always provided with the same reference numerals.

For the ensuing description, it is claimed that the invention is not limited to the embodiments and not to all or several features of described combinations of features, but rather, each individual feature of the / each embodiment is also detached from all other features described in connection therewith also in combination with any features of another embodiment of importance for the subject invention.

1 represents a measuring device according to the invention 1 in a closed position for the inductive measurement of an electric current in an overhead line 16 dar. The measuring device 1 has a two-part measuring core (see, for example, 2a ) with a first sub-core 18 and a second subkernel 19 on, in a closed position of the measuring core, a receiving space for receiving the overhead line 16 form. In the closed position, the measuring core encloses the overhead line 16 full radially with respect to the extension axis X. Since the in 1 illustrated overhead line 16 extends perpendicular to the plane of the figure, the extension axis X is indicated by a point in 1 indicated. The first subkernel 18 is according to the invention via a longitudinally perpendicular to the extension axis X of the overhead line 16 extending movement axis B movable ausgestaltetes actuating means 4 within a movement path T from the closed position into an open position convertible or vice versa. In the open position are the split cores 18 . 19 spaced apart such that the overhead line 16 in the receiving space of the measuring core is receivable.

According to the invention, a two-stage transmission is provided for transferring from an open position to the closed position or vice versa, wherein the transmission as a first gear stage, the actuating means 4 having. As a second gear stage, the transmission has a linkage 5 on, the more about transversely to the axis of movement B extending axes A, C, D, E, F, G rotatably formed lever 2 . 9 . 10 . 11 having. The linkage 5 is with the first subkernel 18 connected. Furthermore, the linkage 5 designed such that the movement path T of the actuating means 4 from the open position to the closed position is smaller than a via the linkage 5 to the first sub-core 18 transmitted tensioning path S for transferring the first part of the core 18 from the open position to the closed position for fixing the overhead line 16 ,

Accordingly, according to the invention a translational movement of the actuating means 4 as the first gear in rotatory movements of the lever 2 . 9 . 10 . 11 of the joint gear 5 translated as the second gear stage to transfer the measuring core from the open position to the closed position or vice versa.

Preferably, all levers 2 . 9 . 10 . 11 of the joint gear 5 rod-shaped and each at its two longitudinal axes of main axes of the lever 2 . 9 . 10 . 11 opposite ends across the axes A, C, D, E, F, G with other levers 2 . 9 . 10 . 11 of the joint gear 5 connected. It is preferably provided that the axes A, C, D, E, F, G of the lever 2 . 9 . 10 . 11 transverse, in particular perpendicular to the movement axis B extend. Preferably, the axes A, C, D, E, F, G extend the lever 2 . 9 . 10 . 11 parallel to the extension axis X of the overhead line 16 ,

In particular, in the closed position of the first part of the core 18 and the second subkernel 19 over facing contact surfaces 18a . 18b . 19a . 19b to each other. Preferably, the contact surfaces are 18a . 18b . 19a . 19b in the closed position of the measuring core over the entire surface to each other and extend parallel to each other. This reduces during the measurement in the closed position at the contact surfaces 18a . 18b . 19a . 19b caused interference fields within the measuring core, so that a reliable current measurement can be done. The split cores 18 . 19 the measuring core are in particular for the transfer of the closed position to the open position, see 2a to one to the extension axis X of the overhead line 16 parallel pivot axis A pivotally arranged to each other.

Like in the 2a is apparent, is the second sub-core 19 the measuring core, in particular in a second leg 3 the measuring device 1 arranged and the first sub-core 18 is in a first thigh 2 the measuring device 1 arranged. The first leg 2 is preferably part of the linkage 5 ,

The first leg 2 is preferably with respect to the second leg 3 pivotable about the pivot axis A. The pivot axis A is preferably made of a bolt 25 formed, which in one Suspension, especially in a slot 26 , on the second leg 3 the measuring device 1 is held.

The slot 26 preferably extends along the perpendicular to the pivot axis A extending axis of movement B. The slot 26 is preferably formed such that the first part of the core 18 with its contact surfaces 18a . 18b at a distance between the contact surfaces 18a . 18b . 19a . 19b the two part cores 18 . 19 less than or equal to the radial length of the contact surfaces 18a . 18b of the first subkernel 18 at an angle in a range of 0 ° to 15 ° to the contact surfaces 19a . 19b of the second subkernel 19 is aligned. About the formation of the slot 26 thus avoiding the contact surfaces 18a . 18b . 19a . 19b the split cores 18 . 19 over a larger distance, over which the part cores 18 . 19 be transferred from the open position to the closed position, only with a small area lie on each other. Because of the contact surfaces 18a . 18b . 19a . 19b the split cores 18 . 19 contact each other over a large area, the risk is reduced, that the contact surfaces 18a . 18b . 19a . 19b the split cores 18 . 19 when transferring the first sub-core 18 towards the second sub-core 19 be mechanically damaged.

In particular, a clamping means 15 provided, which in the closed position of the measuring core a restoring force on the first part of the core 18 in the direction of the second sub-core 19 exercises. Preferably, the clamping means 15 configured and on the measuring device 1 arranged that there is a restoring force in the direction of the second sub-core in the transfer of the open position of the measuring core in the closed position of the measuring core 19 of the measuring core.

Preferably, the restoring force of the clamping means corresponds 15 one through the linkage 5 towards the second sub-core 19 acting lifting force. This has the advantage that the clamping means 15 the linkage 5 assisted in the transfer from the open position to the closed position, so that for actuating the actuating means 4 for the transfer of the first sub-core 18 from the open position to the closed position less force is necessary.

It is preferably provided that in the closed position of the measuring core, the clamping means 15 in the receiving space of the measuring core with a clamping section for clamping holding the overhead line 16 protrudes, see 2d , Thus, the overhead line 16 between the clamping means 15 and the second subkernel 19 be releasably held in the closed position of the measuring core. Consequently, no additional action needs to be taken to the overhead line 16 to fix within the receiving space of the measuring core.

The actuating means 4 is designed in particular as a, particularly preferably rotatable about the movement axis B movable rod. Preferably, the actuating means extends 4 along the axis of movement A perpendicular to the pivot axis A. In particular, the actuating means 4 at a first end to the second sub-core 19 immovable and at a second end opposite the first end, in particular via a support 7 , with the linkage 5 movably connected. The actuating means 4 is preferably movable with a guide element 6 connected. The guide element 6 is for example on the second leg 3 immovable, in particular indirectly via a connecting means attached.

Preferably, the actuating means 4 a rotatable about the movement axis B threaded rod, which with a formed on its outer circumference external thread in an internal thread of the guide element 6 is guided rotatably. The guide element 6 is in particular with the second sub-core 19 immovably connected. The actuator 4 preferably has a handle at a first end 8th and at a second end opposite the first end, the support 7 ,

The support 7 may for example be a cylindrical hollow body which is closed at one end and at the end opposite the closed end of the actuating means 4 receives. In the area of the closed end, the support can 7 with the linkage 5 be connected. In particular, the support is 7 with a seesaw leg 9 as part of the linkage 5 connected. The support 7 is in particular designed such that a translational movement of the actuating means 4 along the movement axis B directly to the rocker arm 9 is transmitted.

In particular, the rocker arm 9 about a pivot axis A parallel to the rocking axis C pivotally configured, wherein the rocker arm 9 on the rocking axis C with the actuating means 4 , in particular via the support 7 , connected is. The rocker leg 9 is preferably stored eccentrically on the Wippachse C, so that the rocker arm 9 with respect to the rocking axis C a longer leg part 9a and a shorter leg 9b includes. This extends the longer leg part 9a between the rocking axis C and a first end of the rocker arm 9 , The shorter leg 9b closes immediately to the longer leg part 9a in the region of the rocking axis C and extends to one of the first End of the rocker arm 9 opposite second end. In particular, the ratio of the length of the shorter leg part 9b and the length of the longer leg 9a two to three. This favors that applied to the actuating force for transferring the first part of the core 18 from the open position to the closed position, or vice versa, in a range that allows a user to manually operate the actuating means without much effort.

The rocking axis C preferably passes through the rocker arm 9 between the two partial legs 9a . 9b , The rocking axis C can also be on a lateral, at one of the transition region between the longer and the shorter leg part 9a . 9b formed, laterally to a main extension direction of the rocker arm 9 about the latter's outstanding approach 21 of the rocker arm 9 be arranged, see 2a ,

The rocker leg 9 and the first leg 2 are in particular about intersecting lever arms 10 . 11 interconnected, with the lever arms 10 . 11 Part of the linkage 5 are. The intersecting arrangement of the lever arms 10 . 11 affects the movements of the rocker leg as follows 9 and the subkernel 18 , preferably of the first leg 2 , from: If the shorter leg part 9b of the rocker arm 9 in the direction of the actuating means 4 pivoted, pivots the first sub-core 18 in a rocking leg 9 opposite direction, which is directed in the direction of the open position. If the longer leg part 9a of the rocker arm 9 in the direction of the actuating means 4 pivoted, pivots the first sub-core 18 again in the direction of the closed position, wherein this pivoting direction is also one to the pivoting direction of the rocker arm 9 opposite direction corresponds. The movements of the lever arms 10 . 11 and the rocker arm 9 in cooperation with the actuating means 4 can be based on the 2a to 2d be traced.

Preferably, the rocker arm 9 on one of the rocking axis C remote end of the longer leg part 9a about a pivot axis A parallel to the first extending lever axis D rotatably with a first lever arm 10 connected. On one of the rocking axis C remote end of the shorter leg 9b is the rocker leg 9 in particular via a to the pivot axis A parallel second lever axis E rotatable with a second lever arm 11 connected. The first lever arm 10 is again preferably rotatable about a first axis of rotation F with the first part of the core 18 , in particular with the first leg 2 , connected. The second lever arm 11 is in particular rotatable about a second axis of rotation G with the first part of the core 18 , in particular with the first leg 2 connected. Preferably, the first axis of rotation F and the second axis of rotation G are parallel to the pivot axis A of the first part of the core 18 ,

The ratio of the distance between the first lever axis D and the rocking axis C of the longer leg part 9a and the distance between the second lever axis E and the rocking axis C of the shorter leg part 9b preferably determines the translation of the power transmission between the actuating means 4 and the first subkernel 18 , The ratio of the aforementioned distances is preferably selected such that the actuating means 4 along the movement axis B travels a distance T, see 2c , which with a total distance S of the first sub-core 18 , In particular, the remote from the pivot axis A contact surface 18b of the first subkernel 18 , for the conversion from the open position into the closed position, a ratio in a range of S: T> 1 to S: T <5, preferably a ratio of S: T = 1.3. For example, the first subkernel has 18 , In particular, the remote from the pivot axis A contact surface 18b of the first subkernel 18 , a stroke of 26.3 mm at a ratio of S: T = 1.3, so that a received in the open position overhead line 16 with a diameter of 35 mm in a reasonable time in a closed position of the split cores 18 . 19 or the thighs 2 . 3 can be enclosed. The ratio of the distances between the axes C, D, E determines how much force on the actuator 4 acted upon or at what distance along the movement axis B, the actuating means 4 must be moved to the first sub-core 18 to transfer from the open position to the closed position and vice versa.

Preferably, the second lever arm 11 longer than the first lever arm 10 , In particular, the ratio of the distance between the axes E and G of the second lever arm 11 and the distance between the axes D and F of the first lever arm 10 four to three. This favors that applied to the actuating force for transferring the first part of the core 18 from the open position to the closed position, or vice versa, in a range that allows a user to manually operate the actuating means without much effort.

The first lever arm 10 is in particular near the pivot axis A with the first leg 2 connected via the first axis of rotation F. The second lever arm 11 is preferably spaced from the pivot axis A with the first leg 2 connected via the second axis of rotation G. The two lever arms 10 . 11 are in particular with the first leg 2 connected and / or formed such that their two axes of rotation F, G are in the closed position on a straight line L perpendicular to the Movement axis B of the actuating means 4 and perpendicular to the pivot axis A of the first leg 2 runs, see 2d , Preferably, the two lever arms 10 . 11 at their axes of rotation F, G via a connecting strip 17 connected, see 1 to 3 ,

In particular, the first, in particular shorter, lever arm 10 and the rocker leg 9 designed such that in the open position of the measuring core a centrally through the first axis of rotation F and centrally through the first lever axis D of the first lever arm 10 extending straight line J a centrally through the two lever axes D, E of the rocker arm 9 extending straight line H intersects at an angle α1 in a range of 5 ° to 20 °, see 2a , The straight lines H, J, K described above and below extend along a respective main extension axis of the lever arm 10 . 11 or the rocker arm 9 , please refer 2a and 2d , The arrangement or training of the rocker arm 9 and the first lever arm 10 favor that on the actuating means 4 applied force for transferring the first part of the core 18 from the open position to the closed position, or vice versa, in a range which makes it possible for a user to control the actuating means 4 without manual effort.

Preferably, the second, in particular longer, lever arm 11 and the rocker leg 9 designed such that in the open position a centrally through the second axis of rotation G and centrally through the second lever axis E extending straight line K of the second lever arm 11 (in 2a shown by dashed lines) with the through the lever axes D, E of the rocker arm 9 extending straight line H includes an angle α2 equal to or less than 90 °, see 2a , This favors that on the actuating means 4 applied force for transferring the first part of the core 18 from the open position to the closed position, or vice versa, in an area that allows a user to control the actuating means 4 without manual effort.

In particular, the first lever arm 10 and the rocker leg 9 designed such that in the closed position, see 2d , the straight line J passing through the first lever axis D and the first axis of rotation F, of the first lever arm 10 and the through the two lever axes D, E extending straight line H of the rocker arm 9 preferably include an angle α3 in a range of 60 ° to 70 °. This facilitates that applied to the actuating force for transferring the first part of the core 18 from the open position to the closed position or vice versa is in a range which makes it possible for a user to manually operate the actuating means without much effort.

Preferably, the second lever arm 11 and the rocker leg 9 designed such that in the closed position extending through the second lever axis E and the second axis of rotation G straight line K of the second lever arm 11 and the through the two lever axes D, E extending straight line H of the rocker arm 9 include an angle α4 in a range of 15 ° to 25 °. This facilitates that applied to the actuating force for transferring the first part of the core 18 from the open position to the closed position or vice versa is in a range which makes it possible for a user to manually operate the actuating means without much effort.

The first lever arm 10 has in particular in the region of the first axis of rotation F two extensions 13 . 14 that branches off from the first lever arm 10 extend away, see 1 , At a first extension 13 of the first lever arm 10 lies the clamping means 15 , in particular a clamping spring, on. About this clamp 15 can in the closed position the overhead line 16 in the receiving space between the two sub-kernels 18 . 19 be held, in particular clamped to be fixed, see 1 and 3 ,

Particularly preferred in the case of a clamping spring, a leaf spring or a leg spring is provided. Preferably, the clamping spring is so on the extension 13 arranged and trained that she the extension 13 acted upon by a force in the direction of the measuring core. Through a second extension 14 of the first lever arm 10 runs the first axis of rotation F of the first lever arm 10 ,

As an alternative to a clamping spring, a rigid clamping jaw may be provided, which via an additional gear after or during the transfer of the first leg 2 from the open position to the closed position to the overhead line 16 is brought to the plant by clamping.

In particular, at least one of the split cores possesses 18 . 19 , preferably one of the legs 2 . 3 , In the region of the receiving space a concave recess. In this recess, the overhead line 16 be recorded.

Preferably, at least the first sub-core 18 , in particular the first leg 2 , enclosed by a housing, on which in particular the guide element 6 is attached. The housing may be the connecting means between the second leg 3 and the guide element 6 be. The housing also has the advantage that the user when using the measuring device 1 in front of lightning from the overhead line 16 on the measuring device 1 rolled over, protected.

It can in the case of trained as a leg spring clamping means 15 be provided that a free end of a first leg 2 the leg spring is fixed to the housing. A second leg of the leg spring may then be on the first lever arm 10 , in particular at its first extension 13 issue.

It can be provided that the operating handle 8th of the actuating means 4 an opening 22 in which can be intervened with an engagement means to the actuating means 4 to move along the movement axis B, see, for. B. 2a , The engagement means is in turn preferably connected to a long pole, for example 2 meters long, of electrically insulating material.

In particular, the measuring device 1 with a movement mechanism for transferring the first sub-core 18 configured from the open position to the closed position or vice versa mirror-symmetrical to the movement axis B. In particular, mirror-symmetrical to the movement axis B are each a single linkage 5 arranged opposite each other, with the single actuating means 4 , in particular via a common support 7 are connected.

Preferably, all are for moving the first sub-core 18 , preferably of the first leg 2 , provided, in particular movable components mirror-symmetrical to the actuating means 4 educated. Preferably, mirror-symmetrical to the movement axis B are each a single linkage 5 arranged to each other, wherein the linkage 5 with the single actuator 4 are connected. This has the advantage that the contact surfaces 18a . 18b . 19a . 19b the split cores 18 . 19 in the closed position over the entire surface, the play of the joint gear 5 can be reduced, or the mechanics of the joint gear 5 is spared.

For example, there are two rocker arms 9 provided on both sides with respect to the movement axis B on a single support 7 , in particular via a common rocking axis C, are pivotally mounted. Accordingly, in each case a pair of lever arms 10 . 11 and two connection bars 17 as well as two clamping means 15 , in particular two clamping springs, provided, the mirror-symmetrical to the movement axis B respectively opposite each other as described above with respect to the actuating means 4 are arranged. That the clamping means 15 are arranged opposite each other, has the additional advantage that the overhead line 16 mechanically more gentle over a larger contact surface than with a clamping means 15 is held within the closed position of the measuring core within this.

Preferably, the lever arms 10 . 11 in each case via mirror-symmetrical to the movement axis B formed axes D, E with the respective rocker arm 9 rotatably connected. In particular, the mirror-symmetrical to the movement axis B formed first lever arms 10 via a single common first axis of rotation F with the first part of the core 18 , preferably with the first leg 2 , and the mirror-symmetrical to the movement axis B formed second lever arms 11 via a single common second rotation axis G with the first sub-core 18 , preferably with the first leg 2 , connected.

It is equally within the scope of the invention, the measuring device 1 to design with a movement mechanism each having a previously described component. Also, for example, a single rocker arm 9 be provided, each with a mirror symmetry to the movement axis B formed pair of lever arms 10 . 11 connected is. Additionally or alternatively to a rocker leg 9 For example, only a first lever arm could 10 and a second lever arm 11 as previously described with the rocker arm 9 form a movement mechanism. Also could be provided, two first leg 2 to integrate into the movement mechanism.

The measuring device according to the invention 1 has the following operation: In its open position, see 2a , the measuring device becomes 1 with her second thigh 3 to the overhead line 16 hanged, wherein preferably the concave recess of the second leg 3 at least over a partial circumference of the overhead line 16 attached to this. Following is the actuating means 4 , preferably via the operating handle 8th , along the axis of movement B in the direction of the partial cores 18 . 19 emotional. In particular, the actuating means 4 via a rotational movement in the direction of the partial cores 18 . 19 emotional. The rocker leg 9 , which in the open position with its longer leg part 9a towards the actuator 4 shows is by the movement of the actuating means 4 in the direction of the partial cores 18 . 19 about the rocking axis C in the direction of the shorter leg 9b pivoted. To this is on the 2 B and 2c to illustrate intermediate positions of the partial cores 18 . 19 or thighs 2 . 3 referenced between the open position and the closed position. The longer leg part 9a acts when pivoting the rocker arm 9 like a mechanical power arm, which is on the first lever arm 10 acts. The shorter leg 9b acts like a mechanical load arm, which on the second lever arm when pivoting 11 acts.

The slot 26 and the rocker leg 9 are formed such that the pivot axis A of the first leg 2 in the open position in one of the second leg 3 distant end of the slot 26 is arranged, see 2a , Furthermore, the slot 26 and the rocker leg 9 designed such that in a transfer from the open position to the closed position, the pivot axis A of the first leg 2 in a mutually parallel alignment of the extending through the lever axes D and E straight line H and extending through the axes of rotation F and G straight line L in a second leg 3 closer end of the slot 26 goes over, see 2c ,

When pivoting preferably plays the greater length of the second lever arm 11 opposite the length of the first lever arm 10 a role: The rocker arm 9 is about his shorter leg 9b , which with the second, longer lever arm 11 is connected, in the direction of the actuating means 4 pressed. At the same time, the first lever arm 10 by tilting the rocker arm 9 against the first leg 2 pressed so that this towards the second leg 3 , ie in the closed position, is transferred.

If the rocker leg 9 has been tilted so that it is perpendicular to the axis of movement B of the actuating means 4 is aligned, is the first sub-core 18 over a larger partial distance S1 of the clamping path S of the first partial core 18 from the open position to the closed position on the second sub-core 19 been moved, see 2c , The clamping path S corresponds to the maximum distance between the remote from the pivot axis A contact surfaces 18b . 19b the split cores 18 . 19 in the open position, see 2c , The larger section S1 is in proportion to the greater length of the longer leg 9a of the rocker arm 9 opposite the shorter leg 9b , Will the actuating means 4 Now continue in the direction of the partial cores 18 . 19 moved, places the first sub-core 18 a smaller segment S2 of the clamping path S back, with the smaller length of the shorter leg part 9b in proportion, see 2c ,

To the first sub-core 18 to move along the longer section S1 of the clamping path S, the actuating means 4 be moved over a larger partial path T1 of the movement path T along the movement axis B. To the first sub-core 18 to move along the shorter section S2 of the clamping path S, the actuating means 4 be moved over a smaller partial path T2 than the partial path T1 along the movement axis B. The longer section S1 of the first sub-core 18 is proportional to the longer partial travel T1 of the actuator by the same factor 4 like the shorter leg S2 of the first subkernel 18 to the shorter partial path T2 of the actuating means 4 , The ratio of the sections S1 to S2 thus indicates the factor by which the first sub-core 18 along the longer section S1 faster in the direction of the second sub-core 19 is moved as over the shorter leg S2.

The measuring device according to the invention 1 has the advantage that the first sub-core 18 (Over the greater distance S1) faster towards the second sub-core 19 is movable, so that the measuring core can be converted time-saving from the open position to the closed position or vice versa. Are the partial cores 18 . 19 approximating each other is a slower closing of the two partial cores 18 . 19 (over the smaller section S2) possible, so that the surfaces 18a . 18b . 19a . 19b the split cores 18 . 19 not be damaged mechanically.

The invention is not limited to the illustrated and described embodiments, but also includes all the same in the context of the invention embodiments. It is expressly emphasized that the exemplary embodiments are not limited to all the features in combination, but rather each individual partial feature may also have an inventive meaning independently of all other partial features. Furthermore, the invention has hitherto not been limited to the feature combination defined in claim 1, but may also be defined by any other combination of certain features of all the individual features disclosed overall. This means that in principle virtually every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application.

LIST OF REFERENCE NUMBERS

1

measurement device

2

First leg

3

Second thigh

4

actuating means

5

linkage

6

guide means

7

In stock

8th

operating handle

9

Wippschenkel

9a

Longer partial leg

9b

Shorter leg

10

First, shorter lever arm

11

Second, longer lever arm

13

First extension

14

Second extension

15

clamping means

16

overhead line

18

Partial core of the first leg

18a, 18b

Contact surfaces of the first sub-core

19

Partial core of the second leg

19a, 19b

Contact surface of second sub-core

21

Approach of the rocker arm

22

opening

25

bolt

26

Long hole

A

swivel axis

B

motion axis

C

rocking axis

D

First lever axis

e

Second lever axis

F

First axis of rotation

G

Second axis of rotation

H

Straight through D and E

J

Straight through D and F

K

Straight through E and G

L

Straight through G and F

S

Clamping path of the first sub-core

S1

Larger leg

S2

Smaller stretch

T

Movement path of the actuating means

T1

Longer partial path of the movement path

T2

Shorter part way of the movement route

α1

Angle between H and J in open position

α2

Angle between H and K in closed position

α3

Angle between H and J in closed position

α4

Angle between H and K in closed position

X

extension axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 8536857 B2 [0004]

Claims (22)

Measuring device ( 1 ) for the inductive measurement of an electric current in an overhead line (X) extending overhead line ( 16 ), wherein the measuring device ( 1 ) a two-part measuring core with a first partial core ( 18 ) and a second subkernel ( 19 ), which in a closed position of the measuring core, a receiving space for receiving the overhead line ( 16 ), wherein in the closed position of the measuring core the overhead line ( 16 ) radially encloses with respect to the extension axis (X) in full, wherein the first sub-core ( 18 ) via a movably configured actuating means ( 4 ) within a movement path (T) from the closed position into an open position is transferred or vice versa, wherein the actuating means ( 4 ) along a direction perpendicular to the extension axis (X) of the overhead line ( 16 ) extending movement axis (B) is movable, wherein in the open position, the partial cores ( 18 . 19 ) are spaced apart such that the overhead line ( 16 ) is receivable in the receiving space of the measuring core, characterized in that for the transfer from the open position to the closed position or vice versa, a two-stage transmission is provided, wherein the transmission as a first gear stage, the actuating means ( 4 ) and as a second gear stage a linkage ( 5 ), wherein the linkage ( 5 ) with the first subkernel ( 18 ) and a plurality of axes (A, C, D, E, F, G) extending in a manner movable transversely to the axis of movement (B) ( 2 . 9 . 10 . 11 ), wherein the linkage ( 5 ) is configured such that the movement path (T) of the actuating means ( 4 ) is smaller from the open position to the closed position than a via the linkage ( 5 ) to the first sub-kernel ( 18 ) transmitted tensioning path (S) for transferring the first part of the core ( 18 ) from the open position to the closed position for fixing the overhead line ( 16 ). Measuring device ( 1 ) according to claim 1, characterized in that the linkage ( 5 ) is configured such that the actuating means ( 4 ) along the movement axis (B) the movement path (T) travels, which to the tensioning path (S) of the first sub-core ( 18 ) has a ratio in a range of S: T> 1 to S: T <5, preferably a ratio of S: T = 1.3. Measuring device ( 1 ) according to claim 1 or 2, characterized in that the first sub-core ( 18 ) over one to the extension axis (X) of the overhead line ( 16 ) parallel pivot axis (A) pivotally to the second sub-core ( 19 ) is arranged. Measuring device ( 1 ) according to claim 3, characterized in that the linkage ( 5 ) is configured such that the actuating means ( 4 ) along the movement axis (B) traverses the movement path (T) which leads to the tensioning path (S) of a contact surface remote from the pivot axis (A) ( 18b ) of the first sub-kernel ( 18 ) has a ratio in a range of S: T> 1 to S: T <5, preferably a ratio of S: T = 1.3. Measuring device ( 1 ) according to claim 3 or 4, characterized in that in the closed position of the first partial core ( 18 ) and the second subkernel ( 19 ) over mutually facing contact surfaces ( 18a . 18b . 19a . 19b ) abut each other, wherein the pivot axis (A) of the first sub-core ( 18 ) in a slot ( 26 ), which is designed such that the first sub-core ( 18 ) with its contact surfaces ( 18a . 18b ) in the transfer from the open position to the closed position or vice versa at a distance between the contact surfaces ( 18a . 18b . 19a . 19b ) of the two partial cores ( 18 . 19 ) smaller than / equal to the radial length of the contact surfaces ( 18a . 18b ) of the first sub-kernel ( 18 ) at an angle in a range of 0 ° to 15 ° to the contact surfaces ( 19a . 19b ) of the second subkernel ( 19 ) is aligned. Measuring device ( 1 ) according to one of claims 1 to 5, characterized by a clamping means ( 15 ), which in the closed position of the measuring core a restoring force on the first part of the core ( 18 ) in the direction of the second sub-core ( 19 ) exercises. Measuring device ( 1 ) according to claim 6, characterized in that the restoring force of the clamping means ( 15 ) one through the linkage ( 5 ) in the direction of the second sub-core ( 19 ) acting lifting force corresponds. Measuring device ( 1 ) according to claim 6 or 7, characterized in that the clamping means ( 15 ) in the closed position of the measuring core in the receiving space of the measuring core with a clamping portion for clamping holding the overhead line ( 16 ) protrudes. Measuring device ( 1 ) according to one of claims 1 to 8, characterized in that the actuating means ( 4 ) is formed as a, preferably rotatably about the movement axis (B) movable rod which at a first end with the second part core ( 19 ) immobile and at a second end opposite the first end, in particular via a support ( 7 ), with the linkage ( 5 ) is movably connected. Measuring device ( 1 ) according to claim 9, characterized in that the actuating means ( 4 ) is a about the movement axis (B) rotatable threaded rod, which with a formed on its outer circumference external thread in a Internal thread of a guide element ( 6 ) is rotatably guided, wherein the guide element ( 6 ) with the second subkernel ( 19 ) is immovably connected. Measuring device ( 1 ) according to one of claims 1 to 10, characterized in that the actuating means ( 4 ), in particular via the support ( 7 ), with at least one off-center about a rocking axis (C) movably mounted rocker arm ( 9 ) as part of the linkage ( 5 ) is movably connected, wherein the rocker arm ( 9 ) with respect to the rocking axis (C) longer leg part ( 9a ) and with respect to the rocking axis (C) shorter leg ( 9b ), wherein the rocker arm ( 9 ) on its rocking axis (C) via the actuating means ( 4 ) is mounted longitudinally displaceable along the movement axis (B). Measuring device ( 1 ) according to claim 11, characterized in that the ratio of the length of the shorter leg ( 9b ) and the length of the longer leg ( 9a ) is two to three. Measuring device ( 1 ) according to claim 11 or 12, characterized in that the rocker arm ( 9 ) at its two with respect to the rocking axis (C) movable ends each with a lever arm ( 10 . 11 ) as parts of the linkage ( 5 ) is rotatably connected, wherein the lever arms ( 10 . 11 ) crosswise towards the first sub-core ( 18 ) and with the first sub-core ( 18 ) are connected, that a movement of the rocker arm ( 9 ) about the rocking axis (C) an opposite movement of the first part of the core ( 18 ) around the pivot axis (A). Measuring device ( 1 ) according to claim 13, characterized in that the longer partial leg ( 9a ) of the rocker arm ( 9 ) with at least one, in particular shorter, first lever arm ( 10 ) is rotatably connected about a first lever axis (D), wherein the first lever arm ( 10 ) with the first subkernel ( 18 ) is rotatably connected via a first axis of rotation (F) in a region near the pivot axis (A), and the shorter part leg ( 9b ) of the rocker arm ( 9 ) with at least one, in particular longer, second lever arm ( 11 ) is rotatably connected about a second lever axis (E), wherein the second lever arm ( 11 ) with the first subkernel ( 18 ) is rotatably connected in a region remote from the pivot axis (A) via a second axis of rotation (G). Measuring device ( 1 ) according to claim 14, characterized in that the ratio of the length of the first lever arm ( 10 ) and the length of the second lever arm ( 11 ) is three to four. Measuring device ( 1 ) according to claim 14 or 15, characterized in that the first lever arm ( 10 ) and the rocker arm ( 9 ) are configured such that in the open position of the measuring core a centrally through the first axis of rotation (F) and centrally through the first lever axis (D) of the first lever arm ( 10 ) extending straight line (J) one centrally through the two lever axes (D, E) of the rocker arm ( 9 ) extending straight line (H) at an angle (α1) in a range of 5 ° to 20 ° intersects. Measuring device ( 1 ) according to claim 16, characterized in that the second lever arm ( 11 ) and the rocker arm ( 9 ) are configured such that in the open position of the measuring core a centrally through the second axis of rotation (G) and centrally through the second lever axis (E) extending straight line (K) of the second lever arm ( 11 ) with the through the lever axes (D, E) of the rocker arm ( 9 ) extending straight line (H) an angle (α2) less than or equal to 90 °. Measuring device ( 1 ) according to claim 16 or 17, characterized in that the first lever arm ( 10 ) and the rocker arm ( 9 ) are configured such that in the closed position of the measuring core by the first lever axis (D) and the first axis of rotation (F) extending straight line (J) of the first lever arm ( 10 ) and through the two lever axes (D, E) extending straight line (H) of the rocker arm ( 9 ) include an angle (α3) in a range of 60 ° to 70 °. Measuring device ( 1 ) according to claim 18, characterized in that the second lever arm ( 11 ) and the rocker arm ( 9 ) are configured such that in the closed position extending through the second lever axis (E) and the second axis of rotation (G) straight line (K) of the second lever arm ( 11 ) and through the two lever axes (D, E) extending straight line (H) of the rocker arm ( 9 ) include an angle (α4) in a range of 15 ° to 25 °. Measuring device ( 1 ) according to one of claims 1 to 19, characterized in that mirror-symmetrical to the movement axis (B) in each case a single linkage ( 5 ) are arranged opposite to each other with the single actuating means ( 4 ) are connected. Measuring device ( 1 ) according to claim 20, characterized in that mirror-symmetrical to the movement axis (B) in each case a single rocker arm ( 9 ) are arranged opposite one another, which at the common single support ( 7 ) are movably mounted, wherein furthermore mirror-symmetrical to the movement axis (B) in each case a first and in each case a second lever arm ( 10 . 11 ) are opposite one another at a first end with the respective rocker arm ( 9 ) are movably connected, wherein the lever arms ( 10 . 11 ) in each case its end opposite the first end with the single first leg ( 2 ) are connected. Measuring device ( 1 ) according to claim 20 or 21, characterized in that mirror-symmetrical to the movement axis (B) comprises two clamping means ( 15 ) are arranged opposite one another.

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