High voltage circuit breaker and system and method for adjusting the length of an insulating rod for a high voltage circuit breaker

Abstract

A system and method for adjusting the length of an insulating rod for a high voltage circuit breaker and a high voltage circuit breaker are disclosed. A system (10) for adjusting the length of an insulating rod (5) of a high voltage circuit breaker (1) comprises a clutch (11) and a mounting part (12). The clutch (11) comprises a thread (18) having a given thread pitch, and the mounting part (12) includes a thread (19) having a given thread pitch formed in cooperation with the thread (18) of the clutch (11). The mounting part (12) is adjustably coupled to the clutch (11) by the threads (18, 19), and the mounting part (12) is configured to be fixedly coupled to the insulating rod (5) such that the length of the insulating rod (5) is adjustable by rotation of the clutch (11) relative to the mounting part (12) with respect to an assembled state of the system (10) with the insulating rod (5) and with respect to the longitudinal axis (A).

Description

[Technical field]

[0001] The present disclosure relates to a system and method for adjusting the length of an insulating rod for a high voltage circuit breaker, and further to a corresponding high voltage circuit breaker. Summary of the Invention [Problem to be solved by the invention]

[0002] A circuit breaker is an automatically operating electrical switch designed to protect electricity from damage caused by excess current, for example from an overload or short circuit. Thus, a high voltage circuit breaker is a security switch or switchgear configured to operate in the high voltage range, for example 10 kV and above. In this regard, the challenge is to provide a stable and reliable circuit breaker for high voltage applications. [Means for solving the problem]

[0003] An embodiment of the present disclosure relates to a system for adjusting the length of an insulating rod for a high voltage circuit breaker. Further embodiments of the present disclosure relate to a corresponding high voltage circuit breaker including such a system. Further embodiments of the present disclosure relate to a method for adjusting the length of an insulating rod for a high voltage circuit breaker.

[0004] According to one embodiment, a system for adjusting the length of an insulating rod of a high-voltage circuit breaker comprises a clutch and a mounting part. The clutch is configured to couple the insulating rod with a lever of the high-voltage circuit breaker to transmit an action movement that causes separation of electrical contacts of the high-voltage circuit breaker. The clutch includes a thread with a given thread pitch. The mounting part also includes a thread with a given thread pitch formed in cooperation with the thread of the clutch. The mounting part and the clutch are adjustably coupled to each other by means of their threads. The mounting part is configured to be fixedly coupled to the insulating rod with respect to an assembled state of the system with the insulating rod and with respect to a longitudinal axis such that the length of the insulating rod is adjustable by rotation of the clutch relative to the mounting part by means of their threads.

[0005] Due to the described configuration of the system, a safe and reliable length adjustment of the insulating rod of a high-voltage circuit breaker can be realized at low cost. The clutch comprises a coupling part for connection with a lever mechanism of the circuit breaker and an adjustment part including a thread for adjusting the effective length of the insulating rod. The coupling part and the adjustment part are for example formed integrally. The mounting part also comprises a coupling part for connection with the insulating rod of the circuit breaker and an adjustment part including a thread for interacting with the clutch to adjust the effective length of the insulating rod. The mounting part can for example also be formed integrally. The system can thus be realized at low cost with a well-defined structure, forming an intermediate module between the lever mechanism and the insulating rod of the high-voltage circuit breaker.

[0006] The recognition of this disclosure is that the performance of a high voltage circuit breaker is dependent on the arcing and nominal contact travel characteristics. Timing and contact separation are paramount to the circuit breaker's ability to interrupt the associated electricity. Timing is primarily affected by the drive and linkage running characteristics. Manufacturing tolerances are the primary source of linkage inaccuracy. To eliminate the effects of assembly and manufacturing tolerances, the length of the insulating rod can be adjusted during the assembly process by rotating the clutch relative to the mounting.

[0007] By using the system, it is possible to ensure the correct timing of the separation of the electrical contacts despite the manufacturing tolerances of the interrupter components. The system simplifies the adjustment of the length of the insulating rod and thus contributes to compensating for manufacturing and assembly tolerances to a specified value.

[0008] According to one embodiment, the attachment is shaped as a sleeve and its thread is formed as an internal thread on the inside of the attachment, while the clutch thread is formed as an external thread on the outside of the clutch so that, in the assembled state of the system, the clutch extends into the sleeve-shaped attachment, such that a safe and reliable length adjustment can be achieved using only the thin threads of the clutch and of the attachment.

[0009] For example, the threads of the clutch and the attachment are formed in concert with one another and with a given thread pitch such that a rotation of the clutch by 180° about its longitudinal axis relative to the attachment changes the length of the insulating rod by 0.5 mm. According to further embodiments, the thread pitch can be formed alternatively to allow a more precise adjustment or a coarser setting of the length of the insulating rod. In particular, a rotation of the clutch by 180° about its longitudinal axis relative to the attachment changes the length of the insulating rod by half the thread pitch. In the context of this description, the length of the insulating rod described does not relate to the original fixed length of the formed insulating rod element, but to the effective length of the original length of the insulating rod together with the adjustable length provided by the clutch and the attachment and their mating threads.

[0010] According to a further embodiment, the system comprises a fixing member coupled to the clutch, configured to counteract an undesired rotation of the clutch relative to the mounting part. For example, the fixing member is formed as a locking pin or a bolt. In this respect, the mounting part and the clutch each comprise a locking opening into which the locking pin is inserted after the length adjustment to counteract further rotation of the clutch. Alternatively or additionally, the fixing member can comprise a nut for fixing the adjusted clutch. The nut can further allow for an advantageous preloading of the clutch and the threads of the mounting part. However, a complex assembly using many elements is not necessary to adjust the length of the insulating rod during assembly. Moreover, no additional adhesive is necessary to fix the adjusted position of the clutch relative to the mounting part.

[0011] Considering conventional designs, the described system does not require the application of torque and the use of adhesives to fix the adjustable element. On the one hand, the application of torque to the insulating rod clutch increases the risk of mechanical failure due to overloading of adjacent parts. On the other hand, there is a definite risk that the applied adhesive will not cure properly and thereby loosen the adjusted connection. The adhesive carries the risk that it is dirty and / or greasy and therefore does not dry reliably.

[0012] Thus, by using the described system, the risk of assembly errors is also reduced due to its well-defined structure. The system provides a convenient and reliable way to adjust the length of the insulating rod during assembly, the adjustment not requiring any tools.

[0013] According to a further embodiment, the fixed position of the clutch relative to the mounting part can be further fixed in place by a fixing element, which can be formed as a spring clip configured to fix the position of the fixing member relative to the assembled adjusted state of the system and the insulating rod.

[0014] According to a further embodiment of the system, the clutch is shaped as a sleeve in the region of its thread that limits the inner relief recess. Such deliberately formed openings can contribute to improving the force and tension distribution. The relief recess can, for example, completely penetrate the clutch along the longitudinal axis. Alternatively, the relief recess is formed in the adjustment part of the clutch with a given depth. The shape of the relief recess can be a cone tapering in the direction towards the coupling part. Alternatively, with respect to the longitudinal axis, the relief recess is cylindrically limited by the peripheral wall of the clutch that supports the thread.

[0015] The longitudinal axis essentially represents the axis of symmetry of the clutch, the attachment and the insulating rod. Thus, according to the assembled state, the attachment is located between the clutch and the insulating rod along the longitudinal axis. The longitudinal axis can also represent the axis of rotation of the clutch relative to the attachment.

[0016] The clutch can be made, for example, from steel, the insulating rod can also be made from steel, and the attachment, for example made from aluminum, is adhesively fixed to the insulating rod.

[0017] According to a further embodiment of the system, the mounting part comprises a support which limits a support recess facing the clutch. The clutch comprises a shoulder adjacent to its adjustment part with its thread. The support part of the mounting part and the shoulder of the clutch are formed in cooperation with each other such that a guided support connection of the clutch and the mounting part is set. The mounting part can be realized as a sleeve or tube with an opening facing the clutch. At the support part, a wall of the mounting part limits the support recess to guide the insertion of the clutch and interacts with the shoulder of the clutch to support the clutch in the adjusted state. The support part is formed, for example, adjacent to the thread. The support recess can be manufactured as a drilling which forms a guide hole by sliding fit.

[0018] The threads of the clutch and the attachment can each have a length relative to the longitudinal axis that is preformed according to the tensile strength of the attachment relative to the assembled state of the attachment with the insulating rod. Alternatively or additionally, the threads of the clutch have a diameter transverse to the longitudinal axis that is preformed according to the material and / or tensile strength of the attachment relative to the assembled state of the attachment with the insulating rod. The threads of the clutch and the attachment are formed as thin threads to allow precise adjustment and stable and secure holding of the interacting clutch, attachment and insulating rod. The diameter and / or length of the threads are therefore formed as large and / or long as possible to allow full support of the acting forces.

[0019] According to one embodiment, a high voltage circuit breaker comprises an insulating rod configured to separate electrical contacts of the high voltage circuit breaker and an embodiment of the above-mentioned system for adjusting the length of the insulating rod. The system is directly or indirectly coupled to the insulating rod by a mounting. As a result of the high voltage circuit breaker comprising an embodiment of the system, the described features and properties of the system are also disclosed with respect to the high voltage circuit breaker and vice versa.

[0020] According to one embodiment, a method for adjusting a length of an insulating rod of a high voltage circuit breaker includes providing a clutch and a mounting portion with respective threads and a given thread pitch. The method further includes coupling the mounting portion to the clutch by screwing using the threads such that the clutch is adjustably coupled to the mounting portion. The method further includes fixedly coupling the mounting portion to the insulating rod. Coupling of the mounting portion to the insulating rod can occur after or prior to coupling of the clutch to the mounting portion. The method further includes rotating the clutch relative to the mounting portion about a longitudinal axis, thereby adjusting the length of the insulating rod.

[0021] The described method allows for easy and accurate adjustment of the length of the insulating rod of a high voltage circuit breaker during assembly, contributing to stable and reliable functioning of the circuit breaker. As a result of the method corresponding to an adjustment process using one embodiment of the aforementioned system, the described features and characteristics of the system are also disclosed with respect to the method and vice versa.

[0022] According to one embodiment of the method, the clutch and the mounting part each comprise a locking opening, and the method further comprises providing a locking member, for example formed as a locking pin, which is inserted into the locking openings of the mounting part and the clutch, thereby rotatably locking the clutch relative to the mounting part about the longitudinal axis.

[0023] Thus, the present disclosure includes several embodiments, and all features described with respect to one of the embodiments are also disclosed herein with respect to the other embodiments, even if each feature is not explicitly mentioned in the context of a particular embodiment.

[0024] The described system, the described high-voltage circuit breaker and the described method make it possible to reduce the risk of loosening of the thread during operation. No additional fastening parts, such as adhesives, are required to establish a secure and stable hold. Furthermore, the system makes it possible to reduce the risk of overloading adjacent parts during assembly due to the tightening torque. The clutch and the mounting part are connectable by screwing and are configured to allow precise adjustment due to their given thread pitch. No special tools are required to adjust the length of the insulating rod. In addition, the mechanical stability of the clutch assembled inside the support recess of the mounting part can be significantly increased.

[0025] Exemplary embodiments are described below with the aid of schematic diagrams and reference numbers. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a cross-sectional side view of an embodiment of a high voltage circuit breaker. [Diagram 2] FIG. 1 is a cross-sectional side view of an embodiment of a system for adjusting the length of an insulating rod of a high voltage circuit breaker. [Diagram 3] FIG. 1 is a cross-sectional side view of an embodiment of a system for adjusting the length of an insulating rod of a high voltage circuit breaker. [Figure 4] FIG. 1 is a perspective view of a system for adjusting the length of an insulating rod of a high voltage circuit breaker. [Diagram 5] FIG. 1 is a perspective view of a system for adjusting the length of an insulating rod of a high voltage circuit breaker. [Figure 6] FIG. 6 is a perspective view of a clutch of the system according to FIGS. 1 to 5; [Figure 7] FIG. 6 is a perspective view of a mounting part of the system according to FIGS. 1 to 5; [Figure 8] 4 is a flow chart of a method for adjusting the length of an insulating rod of a high voltage circuit breaker. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] The accompanying drawings are included to provide further understanding. It should be understood that the embodiments shown in the figures are illustrative representations and are not necessarily drawn to scale. The same reference numbers indicate elements or components having the same functions. Insofar as elements or components correspond to each other in terms of their functions in different figures, their description will not be repeated for each of the following figures. For clarity, elements may not be labeled with corresponding reference numbers in all figures in some cases.

[0028] 1 shows in cross-sectional side view an embodiment of a high voltage circuit breaker 1. The circuit breaker 1 embodies a security switch or switchgear arranged to operate in the high voltage range, for example 10 kV and above.

[0029] The circuit breaker 1 comprises a system 10 realizing an intermediate adjustment module between the lever mechanism of the circuit breaker 1 and an insulating rod 5, which is configured to separate the electrical contacts of the circuit breaker 1 to protect the electricity from damage caused by overcurrents, for example from an overload or a short circuit. The insulating rod 5 is connected to the moving contact part inside the circuit breaker 1 and is supported by supports 2, 3, 4 realizing elements of the supporting insulator of the circuit breaker 1. The supports 2, 3 and 4 are configured to insulate the circuit breaker or the current carrying components of the circuit breaker 1 towards earth.

[0030] Figures 2-3 show in cross-sectional side views one embodiment of a system 10 for adjusting the length of an insulating rod 5 of a circuit breaker 1. Figures 4-5 show the system 10 in perspective views. Figure 6 shows a clutch 11 of the system 10 in perspective view, and Figure 7 shows a mounting portion 12 of the system 10 in perspective view. Figure 8 shows a flow chart of a method for adjusting the length of an insulating rod 5 of a circuit breaker 1.

[0031] The clutch 11 is formed in one piece with a coupling portion 24, a shoulder portion 23 and an adjustment portion 22 (FIG. 3). The shoulder portion 23 is formed between each adjacent coupling portion 24 and adjustment portion 22 with respect to a longitudinal axis A of the clutch 11. The longitudinal axis A also represents the axis of symmetry of the clutch 11, the mounting portion 12 and the insulating rod 5.

[0032] The clutch 11 is adapted to be coupled to the lever mechanism of the circuit breaker 1 and to transmit an action movement which causes the separation of the electrical contacts of the circuit breaker 1. The clutch 11 therefore comprises a clutch opening 15 in a coupling part 24 which provides a coupling interface for the lever of the lever mechanism. The clutch 11 tapers in the direction of a shoulder 23. In the adjustment part 22, the clutch 11 comprises a thread 18 having a given thread pitch. The thread 18 is formed as an external thread on the outside of the adjustment part 22 facing the mounting part 12 (see Figures 3 and 6).

[0033] The mounting part 12 also comprises a thread 19 with a given thread pitch formed in cooperation with the thread 18 of the clutch 11. The mounting part 12 is in the form of a sleeve, the thread 19 being formed as an internal thread on the inside of the mounting part 12 facing the clutch 11 (see figures 3 and 7). The mounting part 12 is adjustably connected to the clutch 11 by means of the threads 18, 19 (see figures 2 and 3). The mounting part 12 is fixedly connected to the insulating rod 5, for example by means of an adhesive connection.

[0034] The mounting part 12 is formed in one piece with a coupling part 25 and a support part 27 (see FIG. 3). The support part 27 is formed in cooperation with the shoulder part 23 of the clutch 11 and allows a guided insertion of the clutch 11 and a stable retention by interaction with the shoulder part 23.

[0035] The attachment part 12 is formed as a tube or sleeve. The insulating rod 5 is also configured as a tube or sleeve. The attachment part 12 extends partially into the insulating rod 5 so as to be connected to the insulating rod 5 on the inside by a press fit and / or adhesive connection. Furthermore, the clutch 11 extends partially into the attachment part 12 by a supported fit of the support part 27 and the shoulder part 23 as well as by a non-positive and / or form fit by the threads 18, 19.

[0036] The mounting part 12 is disposed between the clutch 11 and the insulating rod 5 along a longitudinal axis A. The longitudinal axis A also represents the axis of rotation of the clutch 11 relative to the mounting part 12. Thus, precise adjustment of the length of the insulating rod 5 is possible by rotation of the clutch 11 relative to the mounting part 12 by means of interacting fine threads 18, 19.

[0037] The engagement thread length L can be adjusted by a given length of the adjustment part 22, which defines the adjustment of the adjustable distance D and the length of the insulating rod 5 (see Fig. 3 and Fig. 6). The adjustable distance D is given by the distance between the clutch opening 15 of the clutch 11 and the outside of the ring 4. The engagement thread length L is configured, for example, to be as long as possible. The formation of the engagement thread length L depends on the material properties of the attachment part 12 and the clutch 11 and / or the tensile strength of the attachment part 12, which is fixedly connected to the insulating rod 5. For example, if the threads 18, 19 of the clutch 11 and the attachment part 12 belong to the M26 thread size and thus comprise a diameter of 26 mm, the engagement thread length L should have a value of 2, 3 times the diameter of the threads 18, 19, thus 59, 8 mm. By using such an engagement thread length L, a perfect force absorption or force distribution is possible. However, shorter or longer lengths are also possible in order to set a predetermined engagement thread length and length of the insulating rod 5, depending on the intended application. The threads 18 and 19 may be of equal or different length, which allows the length of the male threads 18 of the clutch 11 to be shorter than the length of the male threads 19 of the mounting portion 12.

[0038] The clutch 11 is shaped as a sleeve in the region of its thread 18 or the adjustment section 22 which limits the inner relief recess 21. Such deliberately formed openings can contribute to improving the force and tension distribution. The relief recess 21 penetrates the clutch 11 along the longitudinal axis A to a given depth and has a cylindrical shape or is cylindrically limited by the peripheral wall of the clutch 11 which supports the thread 18 with its outer surface.

[0039] The clutch 11 and the mounting portion 12 each include a fixing opening 16, 17 formed to receive a fixing member formed as a locking pin 14 (see Figures 3-6). With the system 10 and the insulating rod 5 in an assembled adjusted state, the locking pin 14 extends into the fixing opening 16, 17 to counteract undesired rotation of the clutch 11 relative to the mounting portion 12. The mounting portion fixing opening 16 is formed as a slot to provide an adjustable length, further allowing the locking pin 14 to extend through the mounting portion 12 and the clutch 11 at different length positions of the adjustable insulating rod 5.

[0040] The fixing opening 16 of the mounting part 12 can be an elongated hole open on one side, as shown in Figures 4 and 5. The fixing opening 17 of the clutch 11 can be formed as a cylindrical hole adapted to the size of the locking pin 14, as shown in Figures 2-3 and 5-6. Furthermore, the clutch 11 can be provided with a further clutch opening 26 formed as an elongated hole passing through the clutch in the region of its coupling part 24 crossing its opening 15. The clutch opening 26 also allows a stable connection with the lever mechanism of the circuit breaker 1.

[0041] Furthermore, the system 10 comprises a fixing element formed as a spring clip 20 configured to fix the position of the locking pin 14 with respect to the assembled state of the system 10 with the insulating rod 5 and the adjusted length of the insulating rod 5 .

[0042] According to FIG. 8 and the illustrated flow chart, the method for assembling and adjusting the length of the insulating rod 5 of the circuit breaker 1 can be processed as follows.

[0043] In step S1, the clutch 11 and the mounting part 12 are provided with their threads 18, 19 and associated thread pitches, as well as their respective openings 15, 16, 17, 26 and / or recesses 13, 21.

[0044] In step S2, the attachment part 12 is fixed with the insulating rod 5, for example by a press-fit and / or adhesive connection.

[0045] In step S3, the clutch 11 is coupled to the mounting part 12 by screwing the clutch 11 into the mounting part 12 until the shoulder 23 of the clutch 11 is located on the support 27 of the mounting part 12. Thus, the mounting part 12 and the clutch 11 are adjustably coupled to each other by the threads 18, 19.

[0046] In step S4, an adjustment of the length of the insulating rod 5 can be made, whereby the clutch 11 is rotated relative to the mounting part 12 about the longitudinal axis A until the desired effective length of the insulating rod 5, the mounting part 12 and the clutch 11 is set.

[0047] In a further step S5, a locking pin 14 is provided and inserted into fixing openings 16, 17 in the mounting part 12 and the clutch 11 to fix the rotational adjustment position of the clutch 11 relative to the mounting part 12.

[0048] The clutch 11 is therefore fixed in position by a locking pin 14 which engages the mounting portion 12. The locking pin 14 may be secured by a spring clip 20.

[0049] The length of the insulating rod 5 can be adjusted by rotating the clutch 11 through 180°. The adjustment increment is thereby defined by the thread pitch. To increase the mechanical stability, the clutch 11 is provided with a shoulder 23 guided by the support recess 13 and the support 27 of the mounting part 12, reducing the notch effect in case of bending moments or lateral forces. Furthermore, the relief recess 21 ensures a continuous application of forces from the threads 18, 19 to the clutch 11.

[0050] The embodiments shown in Figures 1-8 above represent exemplary embodiments of the system 10 for adjusting the length of the insulating rod 5 of the high voltage circuit breaker 1. Therefore, they do not constitute an exhaustive list of all embodiments. The actual configuration may differ from the embodiments shown in the figures. [Explanation of symbols]

[0051] Reference sign 1 High voltage circuit breaker 2 Flanges 3 Tubes 4. Ring 5 Insulating Rod 10. System 11. Clutch 12 Mounting part 13 Support recess 14 Fixing member / lock pin 15 Clutch opening 16 Fixing opening of mounting part 17 Clutch fixed opening 18 Clutch male thread 19 Female thread of mounting part 20 Spring Clip 21 Relief recess 22 Clutch adjustment part 23 Clutch shoulder 24 Clutch engagement 25 Mounting joint 26 Clutch opening 27 Support for mounting part A Longitudinal axis of high voltage circuit breaker / clutch D Adjustable distance L Engagement thread length

Claims

1. A system (10) for adjusting the length of an insulating rod (5) of a high voltage circuit breaker (1), comprising: a clutch (11) configured to couple the insulating rod (5) to a lever of the high-voltage circuit breaker (1) and transmit a working motion causing separation of electrical contacts of the high-voltage circuit breaker (1), the clutch (11) including a thread (18) having a given thread pitch; a mounting part (12) including a thread (19) with a given thread pitch formed in cooperation with the thread (18) of the clutch (11), the mounting part (12) being adjustably coupled to the clutch (11) by means of the threads (18, 19), the mounting part (12) being configured to be fixedly coupled to the insulating rod (5) such that the length of the insulating rod (5) is adjustable by rotation of the clutch (11) relative to the mounting part (12), with respect to an assembled state of the system (10) with the insulating rod (5) and with respect to the longitudinal axis (A); a fixing member (14) coupled to the clutch (11) configured to counteract undesired rotation of the clutch (11) relative to the mounting portion (12); The system (10), wherein the mounting portion (12) and the clutch (11) each have a fixing opening (16, 17), and the fixing member is formed as a lock pin extending into the fixing openings (16, 17) of the mounting portion (12) and the clutch (11).

2. 2. The system (10) of claim 1, wherein the mounting portion (12) is shaped as a sleeve, the threads (19) of which are formed as female threads on the inside of the mounting portion (12) and the threads (18) of the clutch (11) are formed as male threads on the outside of the clutch (11), and the clutch (11) extends within the sleeve-shaped mounting portion (12).

3. 3. The system (10) according to claim 1 or 2, comprising a fixing element formed as a spring clip (20) configured to fix the position of the fixing member (14) with respect to the assembled state of the system (10) comprising the insulating rod (5) and the adjusted length of the insulating rod (5).

4. 3. A system (10) according to claim 1 or 2, wherein the clutch (11) is shaped as a sleeve in the region of its threads (18) which limits an inner relief recess (21).

5. 3. A system (10) according to claim 1 or 2, wherein the mounting part (12) comprises a support part (27) limiting a support recess (13) facing the clutch (11), the clutch (11) comprising a shoulder (23) adjacent its thread (18), the support part (27) and the shoulder (23) being formed in cooperation with one another such that a guided and supported coupling of the clutch (11) and the mounting part (12) is set.

6. 3. The system (10) according to claim 1 or 2, wherein the threads (18, 19) of the clutch (11) and the mounting part (12) each have a length relative to the longitudinal axis (A) that is preformed according to a tensile strength of the mounting part (12) for an assembled state of the mounting part (12) with the insulating rod (5).

7. 3. The system (10) according to claim 1 or 2, wherein the thread (18) of the clutch (11) has a diameter transverse to the longitudinal axis (A) that is preformed according to the material and / or tensile strength of the mounting part (12) for the assembled state of the mounting part (12) with the insulating rod (5).

8. 3. The system (10) according to claim 1 or 2, wherein the threads (18, 19) of the clutch (11) and the mounting part (12) are formed in coordination with each other and their thread pitch is given such that a rotation of the clutch (11) relative to the mounting part (12) by 180° about the longitudinal axis (A) changes the length of the insulating rod (5) by half the thread pitch.

9. an insulating rod (5) configured to separate the electrical contacts of the high voltage circuit breaker (1); A high voltage circuit breaker (1), comprising: a system (10) for adjusting the length of the insulating rod (5) according to claim 1 or 2, connected to the insulating rod (5) by the mounting portion (12).

10. A method for adjusting the length of an insulating rod (5) of a high voltage circuit breaker (1), comprising the steps of: providing a clutch (11) configured to couple the insulating rod (5) to a lever of the high-voltage circuit breaker (1) to transmit an action movement causing separation of electrical contacts of the high-voltage circuit breaker (1), the clutch (11) including a thread (18) having a given thread pitch, the clutch (11) comprising a fixed opening (17); providing a mounting portion (12) including a thread (19) formed in coordination with the thread (18) of the clutch (11), the mounting portion (12) comprising a fastening opening (16); coupling said mounting portion (12) to said clutch (11) such that said clutch (11) is adjustably coupled to said mounting portion (12) by said threads (18, 19); Fixedly connecting the mounting portion (12) to the insulating rod (5); rotating the clutch (11) relative to the mounting part (12) about a longitudinal axis (A) thereby adjusting the length of the insulating rod (5); Providing a fixing member (14) formed as a locking pin; and inserting the lock pin into the fixing openings (16, 17) of the mounting portion (12) and the clutch (11), thereby fixing the clutch (11) relative to the mounting portion (12) for rotation about the longitudinal axis (A).

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