KR20170096602A - Electrical switching arrangement - Google Patents

Abstract

The present invention relates to an electrical switching apparatus in which a circuit breaker operates easily and more reliably. The electrical switching apparatus according to the present invention comprises: a first switching contact piece (7) and a second switching contact piece (8). The switching contact pieces (7, 8) can move with respect to each other. Through kinematic chains (11, 12, 13, 14), movement can be coupled to at least one of the switching contact pieces (7, 8). A blocking element (26) of a circuit breaker (25) can block at least one mechanical element (12) of the kinematic chains in various positions while keeping a switching state of the electrical switching apparatus substantially unchanged.

Description

ELECTRICAL SWITCHING ARRANGEMENT

The present invention relates to an electric switching device,

A first switching contact piece and a second switching contact piece movable relative to each other,

A kinematic chain for coupling movement to at least one of the switching contact pieces, and

And a circuit breaker having a blocking element for blocking relative movement of the switching contact pieces.

Electrical switching devices are known, for example, from the patent specification DE 103 17 735 B3. This document describes an electrical switching device having a first switching contact piece and a second switching contact piece. The switching contact pieces can move with respect to each other, and the kinematic chain is used to combine movements with one of the switching contact pieces. The kinematic chain has an electrically insulating handle through which movement can be transmitted to one of the switching contact pieces via a cylindrical plate. The fin provided as a blocking element may pass completely through the cylindrical plate and engage with a fixed clearance, depending on the position of the cylindrical plate. In this case, the blocking pin can be inserted into the cylindrical plate at the switching-on position and the switching-off position, thereby ensuring the relative position of the first switching contact piece and the second switching contact piece at the switching- have. For the movement of the switching contact, the blocking pin must be completely removed from the cylindrical plate.

A known electrical switching device has a rigid circuit breaker for securing two relative positions between the first switching contact piece and the second switching contact piece. However, it has been found that it is relatively difficult to operate or operate the circuit breaker, since each operator must operate the electrical insulation knob without assistance and adjust the removal or insertion of the provided locking pin thereto. During switching of known electrical switching devices, there are corresponding situations where the specific switching position of the switching contact pieces relative to each other must be fixed, but the fixing time depends on the combination of the operation of the blocking pin and the handle. In addition, only two predetermined relative positions of the switching contact pieces can be ensured by the breaker.

As a result, it is an object of the present invention to construct an electrical switching device of the type initially mentioned in such a way that an easy and more reliable operation of the circuit breaker is possible.

This object is achieved by means of a blocking element which, in the case of an electrical switching device of the type mentioned at the beginning, according to the invention, is capable of blocking at least one mechanical element of the kinematic chain at various positions while the switching states of the switching contact pieces remain the same .

The electrical switching device functions to switch the current path. For example, switching contact pieces that can be moved relative to each other for this purpose are used. In order to create a relative movement, at least one of the switching contact pieces is connected to a kinematic chain. The kinematic chain connects at least one of the switching contact pieces to the actuator to generate motion. The actuator may be part of a kinematic chain. The electrical switching device may be, for example, a disconnector such as may be used in the arresting current path of a surge arrester. The braking current path has a variable impedance control element with particularly nonlinear characteristics. The braking current path in this case connects the phase conductor to be protected to the ground potential, and the braking current path can be conducted or disconnected according to the voltage drop of the variable impedance control element. The phase conductor can correspondingly be protected by a surge arrester. In particular, it is possible to prevent the phase conductor or its electrical insulation from being damaged by the overvoltage. The phase conductors may be components of high voltage equipment such as, for example, transformers, switching equipment, and the like. If the cutoff voltage is exceeded, the electrical insulation of the phase conductor may be destroyed or overloaded. Particularly in the case of insulation, not self-healing, such as for example solid insulation, this can lead to an example of irreversible damage of electrical insulation. This can be accommodated through a braking current path with an impedance element. To this end, the variable impedance control element may have a rated voltage. Since the rated voltage of the variable impedance control element can be designed to correspond to the cutoff voltage of the phase conductor, the variable impedance control element has a low impedance behavior when the cutoff voltage is exceeded in the phase conductor, while the variable impedance control element has a cutoff voltage Lt; RTI ID = 0.0 > impedance < / RTI > The voltage limitation that can be achieved by the surge arrester arrangement makes it particularly possible to protect the electrical insulation of the phase conductor.

As the variable impedance control element, for example, a varistor may be used. A varistor is a nonlinear resistor that changes the impedance according to the applied voltage. Depending on the requirements, the varistor may be constructed, for example, as a semiconductor. May be provided to use a metal oxide to form a varistor. In particular, zinc oxide varistors have been found to perform well. In order to increase the loading capacity, for example blocks of a plurality of zinc oxide elements can be clamped together, the dielectric strength of the varistor is increased. In order to further increase the current-carrying capacity, a plurality of variable impedance control elements, for example, a plurality of rows of zinc oxide elements stacked on top of one another, may also be electrically connected in parallel with each other.

In the case of a test, it may be necessary, for example, to apply an overvoltage to the phase conductor such that the braking current path is conducted through the variable impedance control element. In this case, the electrical switching device can be inserted, for example, in the braking current path, i.e. preferably in series with the variable impedance control element. By the switching device, the braking current path can be electrically disconnected, and the protective effect of the variable impedance control element is invalidated. In this case, the electrical switching device may be located at the high voltage end or the ground end of the braking current path. By the kinematic chain, the actuation of the switching contact pieces of the electrical switching device which can move relative to each other can be performed. Depending on the position of the switching contact pieces or their electrical potential, the kinematic chain may be provided with an electrically insulating portion, in particular to prevent shorting of the variable impedance control element.

The switching states of the switching devices can preferably be fixed at defined switching positions of the switching contact pieces that are movable relative to each other. Thus, for example, fixation of the relative position of the switching contact pieces in the switched-off state of the switching contact pieces can be provided. It is also possible to provide for the locking of the position of the switching contact pieces in the switched-on state of the switching contact pieces movable relative to one another. In this case, the inserted breaker is dimensioned such that the driving force transmitted by the kinematic chain can be absorbed by the breaker, ensuring reliable blocking of movement and preventing transmission of force through the kinematic chain.

For example, the blocking element of the breaker can be moved into the movement path of the mechanical element of the kinematic chain, so that blocking of the movement of the mechanical element is caused, for example, by a contact of the blocking shoulder with the blocking element And a mechanical element or a kinematic chain is fixed. When a breaker is formed in such a way that the blocking element can block the various positions of the machine elements to be blocked when one and the same switching state is applied, it is possible to deviate from the single position of the kinematic chain being able to be fixed. Thus, the blockage of movement of the kinematic chain can be made in smaller increments, since the blocking element can act repeatedly in the machine element. Thus, for example, by loose fitting in the kinematic chain, the switching contact pieces can remain substantially stationary relative to each other and maintain their switching state despite the movement of the machine elements. Thus, for example, the spindle drive is part of a kinematic chain, the rotation of the machine element can cause the drive of the spindle, and consequently the axial displacement of the socket mounted on the spindle can be provided. In this case, it is advantageous to block the reaction of the motion generated from the switching contact piece by the spindle drive part in advance, so that the breaker can be separated in advance from the force that can be generated from the switching contact pieces. To this extent, the circuit breaker substantially prevents drive motions that may be transmitted through the kinematic chain from acting on the switching contact pieces. Apart from advantageous interruption by the spindle drive, there is a transfer of movement which provides sufficient backlash of the kinematic chain, so that the blocking element can be moved to various positions of the machine element without causing any change in the switching state of the electrical switching device . For example, the blocking element can be engaged with the clearance of the mechanical element, and the mechanical element can have a plurality of blocking shoulders, which can be continuously engaged with the blocking element, depending on the position of the mechanical element. As a result, it is possible to intercept the shape of the mechanical element by the blocking element. In order to form the blocking shoulder, the machine element may have a clearance through which the blocking element can engage, so that it can be provided to block the movement of the machine element. Also, the blocking shoulders can be formed in such a way as to rise from the surface as ridges (e.g., protruding edges). In this case, depending on the configuration of the blocking shoulder, a circuit breaker having backlash and allowing easy blocking and unblocking of the blocking element can be provided to perform blocking. Also, the circuit breaker can be configured in such a way that the blocking occurs with only one directivity, whereas the movement of the mechanical element is permissible if there is a reversal of the directivity. The circuit breaker may be provided in such a manner that the circuit breaker performs an interruption, completely blocking any movement of the mechanical element, and is configured as a result of the kinematic chain.

A further advantageous arrangement may be provided for the blocking element to act on the rotatably mounted machine element.

The rotatably mounted machine element has the advantage that the machine element lies in a rotary bearing and the rotation is such that a blocking shoulder (possibly a plurality of blocking shoulders) capable of interacting with the blocking element moves several times past the blocking element I will. This provides a plurality of blocking shoulders on the blocking element so that the machine elements can be secured in various relative positions. May be provided to allow backlash of movement in the blocking state when there is rotation of the mechanical element, for example, depending on the position and number of blocking shoulders. Depending on how small the blocking shoulders are, a coarse or fine fixation of the various locations of the machine elements can be performed.

A further advantageous construction can provide that the barrier element is operated by a tool, in particular a wrench.

The tool can be used to control the force exerted to operate the breaker. By using a tool, an increased force effect or otherwise a reduction of the force effect can be performed. In addition, the use of the tool allows only the person who owns the tool to perform the operation of the circuit breaker, and consequently to perform the securement in such a way that the operation of the electrical switching device can be carried out. For example, the tool can take the form of a wrench, thereby improving the safety in operation of the electric switching device or the breaker. The use of a tool also provides the advantage that the breaker can be accommodated, for example, in an area protected from the effects of weather, so that the breaker needs to be approached only by the tool. As a result, the opening required for the housing to actuate the circuit breaker can be kept small, for example, only allowing access by the tool. As a result, the security of the breaker for operation is further improved.

A further advantageous arrangement is that in the drive housing, which is substantially rotationally symmetrical, the breaker can be provided accessible from the outside.

The rotationally symmetrical drive housing has the advantage that it is possible to manufacture the drive housing easily. Further, a structure without protrusions on the outside is generated, and the drive housing is hardly mechanically damaged. The drive housing may, for example, accommodate a gear mechanism that is part of a kinematic chain. For example, a motion to set the kinematic chain in motion may be initiated in the drive housing. For example, a crank may be provided on the drive housing to allow movement to be manually engaged on the kinematic chain, and a gear mechanism of, for example, a kinematic chain may be disposed within the drive housing , Thereby enabling the gearing down of the motion and / or the gear increase. Locating the access to the breaker outward has the advantage that it is possible to perform a combination of movements from the end face, for example using a crank. In this case, the rotational movement can preferably be coupled to the substantially center of the drive housing which is substantially rotationally symmetrical. Access from the outside is advantageous to avoid overlapping movements. Thus, the driving movement can be reliably introduced into the kinematic chain from the end face, and if necessary, the operation of the breaker can be performed from the outside. For example, a tool receptacle for receiving a tool for actuating a breaker may be used on the outside. Thus, for example, a locking device for a tool in the form of a wrench can be disposed in the drive housing outwardly. In this case, the operating area on the outer side in the drive housing can be provided to be covered by a protective cap which has to be arranged if necessary. This ensures that both the breaker and the additional components located within the drive housing are protected from external influences such as, for example, moisture and contaminants.

Preferably, in order to operate the breaker, the tool may be provided to be arranged on a drive housing which is substantially rotationally symmetrical outwardly.

The tool can be inserted into a drive housing which is rotationally symmetric on the outside. Preferably, a vertical arrangement of the tool relative to the rotational axis of the drive housing may be provided. Advantageously, the blocking element may be provided so that it can move radially relative to the rotational axis of the machine element. The radial direction of the machine element with respect to the axis of rotation has proven desirable since the blocking element and the blocking shoulder can be engaged with each other in the circumferential direction of the machine element. The mechanical element may preferably be aligned with its rotational axis in series with the rotational axis of the rotationally symmetrical drive housing. In this case, the tool alignment direction and the outward alignment of the working axes can be easily achieved.

Advantageously, the machine element may be provided to be a shaft.

The shaft is a machine element that can be rotatably mounted and has a rotation axis. The shaft can rotate about a rotational axis, and in particular, the blocking element can interact with the shaft in a radial direction relative to the rotational axis of the shaft. For this purpose, the shaft may have at least one corresponding blocking shoulder. The blocking shoulder can be formed by the clearance of the shaft or the blocking shoulder (e.g., a profiled shaft) of the shaft. The shaft may, for example, consist of spindles or polygons or may be cranked at some point.

A further advantageous configuration is that the shaft is mounted at an axial distance from the first bearing point and the second bearing point, and the blocking element can be provided to act between the two bearing points.

Mounting the shaft at two bearing points enables reliable guidance of the shaft and rotation of the shaft without backlash. By axially separating the bearing points, the blocking element can act between the bearing points. As a result, a structure resistant to torsion is generated. For example, in order to fix the shaft in its position, the bearing point may be provided to function as an axial stop. A ball bearing capable of axially blocking the mobility of the shaft can be used, for example, as a bearing point.

A further advantageous construction can be provided such that the blocking element engages the clearance of the machine element.

The clearance of the mechanical element enables the blocking element on the shaft or mechanical element to interact and form a blocking shoulder which can have a blocking effect. In this case, the clearance can change the cross section of the mechanical element or the shaft. For example, the shaft may have a polyhedral structure, e.g., a square or hexagonal structure, at certain portions so that a plurality of shoulders on which the blocking elements can interact are formed on the circumference of the shaft. As a result, depending on the number of shoulders extending outwardly into the shaft, somewhat frequent fastening of the machine elements during rotation is possible. In addition, the shaft may have a gap in the manner of a blind hole through which the blocking element can engage. Depending on the shape of the gap, the interruption by the blocking element can be carried out with a greater or lesser amount of backlash. Preferably, a clearance that takes the form of complementing the barrier element should be made in the machine element. If there are multiple gaps in the mechanical element, the axis of the blocking shoulder must be aligned substantially radially or tangentially or at right angles to the rotational axis of the machine element.

A further advantageous arrangement can be provided such that the shaft has an increase in cross-section in the region in which the blocking element is acting.

The increase in section allows the creation of a blocking shoulder on the surface of the machine element of the kinematic chain. In addition, the increase in section provides the possibility of creating gaps in the machine elements, in the manner of gaps, for example blind holes, and this increase in cross section is also possible in the area of the blocking shoulders, To provide sufficient mechanical stability of the shaft. In addition to mechanical reinforcement of the mechanical element through an increase in cross-section, such an increase in cross-section may also serve the purpose of limiting the possibility of axial displacement of the mechanical element, particularly the shaft. For example, there may be bearing points for shafts or machine elements that are adjacent to or laterally adjacent to an increase in cross section, and bearing points, for example, allow rotational movement of the machine elements, but prevent axial movement.

A further advantageous arrangement can be provided such that the circuit breaker is arranged on the housing of the switching device.

The housing of the switching device serves to mechanically separate the switching device. In this case, the switching device has in particular a switching device with switching contact pieces movable relative to each other. The switching device in this case has to be at least partially disposed within the housing. Wherein the housing surrounds and bounds the switching device. For example, as initially described, the switching device may be placed in a braking current path with a surge arrester. The variable impedance control element may be disposed at least partially within the housing. As a result, the braking current path can also be at least partially disposed within the housing. The housing itself may be in the form of an electrically conductive or electrically insulating, if necessary, part of which may have a different potential. In the case of the electrically conductive housing, it is desirable to have a ground potential. The circuit breaker may be mounted on the drive housing, for example, and the drive housing is disposed on the housing of the switching device. For example, the drive housing may be flanged on the housing of the switching device. This has the advantage of being able to perform repairs easily and inexpensively.

A further advantageous arrangement can provide that the housing is a pressure vessel.

The pressure vessel is a container capable of hermetically accommodating the medium, and it is possible for the medium to receive negative pressure or positive pressure in the housing. Preferably, the electrically insulating fluid disposed in the pressure vessel performs electrical insulation of the electrically conductive portion located within the pressure vessel. For example, the switching contact pieces may be electrically insulated by an electrically insulating fluid. For this purpose, the switching contact pieces may be immersed in an electrically insulating fluid. In particular, electrically insulating fluids are found to be successful fluorine compounds such as sulfur hexafluoride, fluoroketones and fluoronitriles. However, other fluids such as carbon dioxide, nitrogen, purified air, etc. may also be used. The fluid may preferably be in a gaseous state in a pressure vessel. However, the fluid may be provided in the housing in a liquid state or partly in a gas state and partly in a liquid state. The formation of the fluid-tight housing does not necessarily have to be a pressure-tight housing, but has the advantage that the fluid can be sealed without fear of undesirable evaporation of the fluid.

A further advantageous arrangement may in particular provide that a surge arrester with a disconnecting device is at least partly disposed within the housing.

The surge arrester device has a surge arrester. For example, a nonlinear variable impedance control element such as a varistor may be used, for example, as a surge arrester. Surge arresters are in this case in particular a part of the braking current path extending between the phase conductor to be protected and the ground potential. Particularly, a separator can be arranged in the braking current path. The separator may also be referred to as an electrical switching device having a first switching contact piece and a second switching contact piece movable relative to each other.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Exemplary embodiments of the present invention are schematically illustrated in the drawings and described in more detail below. In the drawing:
Figure 1 shows a cross-section through an electrical switching device,
Figure 2 shows a cross-section through a drive with a breaker,
Figure 3 shows a cross-section through a breaker,
Figure 4 shows a partially blocked circuit breaker.

Figure 1 shows a section of an electrical switching device. In this case, the electrical switching device has the housing 1. The housing 1 is substantially cylindrical and has a substantially circular section. The housing (1) extends coaxially with respect to the shaft (2). The housing (1) has a metal body with a ground potential. The end face of the main body of the housing 1 is formed by the electrically insulating disk insulator 3. The housing 1 itself is formed in the fluid-tight housing 1 so that the interior of the housing 1 in this case is filled with an electrically insulating fluid so that the housing 1 prevents unintentional evaporation of the fluid in which it is filled. The electrically conducting portion of the housing 1 is at the ground potential.

The housing (1) houses therein a surge arrester (4) arranged in a line substantially in the direction of the shaft (2). The surge arrester 4 functions as a variable impedance control element, and this variable impedance control element has a variable impedance behavior according to the electrical voltage across it. Thus, the surge arrester 4 is a nonlinear impedance element. Preferably, the surge arrester 4 may be based on a metal oxide, especially zinc oxide. For example, a plurality of metal oxide blocks, one of which is stacked on top of the other, may be electrically connected and connected to form a mechanically stable assembly. The surge arrester 4 is part of a braking current path that carries, for example, a high voltage potential at the high voltage end 5. For this purpose, the phase conductor not shown in FIG. 1 electrically connects the high voltage end 5 of the surge arrester 4 through the upper conductor portion. In this case, the phase conductor portion crosses the disk insulator 3 in a fluid-tight manner. The surge arrester 4 is mechanically held against the housing 1 in this case. In the middle of the braking current path, the surge arrester 4 has a ground end 6 remote from the high voltage end 5. In the grounding end 6, a first switching contact piece 7 and a second switching contact piece 8 are arranged in the braking current path. The two switching contact pieces 7, 8 are part of the switching device and can move relative to each other. In this case, the first switching contact piece 4 takes the form of a bushing, which portion is in permanent contact with the grounded end 6 of the surge arrester 4. The second switching contact piece 8 is movably mounted to take the form of a pin and the cross section of the second switching contact piece 8 is formed in a form that complements the bushing opening of the first switching contact piece 7 . The second switching contact piece 8 is permanently grounded and receives the first switching contact piece 7 and the surge arrester 4 in order to transmit the ground potential to the ground end 6 of the first switching contact piece 7 and the surge arrester 4, In the case of setting the electrical contact. To this end, the second switching contact piece 8 is displaceably mounted on the slide bushing 9. The slide bushing 9 in turn is mounted on the housing 1, in particular on a part of the housing 1 with a ground potential, so that the slide bushing 9 can easily receive the ground potential. The second switching contact piece 8 is also in electrical contact with the slide bushing 9 to receive the ground potential. In this case, the second switching contact piece 8 is displaceably mounted along the shaft 2.

An additional configuration may provide that the switching contact pieces 7, 8, which can move relative to each other, are disposed at the high voltage end 5 of the surge arrester. Irrespective of the position of the switching contact pieces 7 and 8, an electrical series connection must be provided between the switching contact pieces 7 and 8 and the surge arrester 4 in the middle of the braking current path.

In order to induce the relative movement of the switching contact pieces 7 and 8, the drive device 10 is arranged on the housing 1. The drive device 10 can be part of a kinematic chain whereby movements created outside the housing 1 are transformed into at least one of the two switching contact pieces 7 and 8 through the walls of the housing 1 . In this case, the passage through the housing 1 of the kinematic chain should preferably be provided in such a way as to ensure that the fluid tightness of the penetrating wall is maintained. The kinematic chain has a drive crank (11), and the rotation can be manually performed by this crank. The rotation of the drive crank 11 is transmitted to the first spindle 12, which is partly connected to the shaft 13 in turn. The shaft 13 penetrates the wall of the housing 1 to enable fluid sealing movement of the kinematic chain. The shaft 13 is connected to the second spindle 14 inside the housing 1. The second spindle (14) is surrounded by a thread of the second contact piece (8). The second contact piece 8 is axially displaceably mounted and guided in a non-rotatably fixed manner so that rotation of the second spindle induces axial movement of the second switching contact piece 8. In the case of the mounting portion of the kinematic chain, the drive device 10 is provided with a drive housing 15.

The drive device 10 shown in Fig. 1 is enlarged and shown in Fig. The drive system 10 has a main framework 16 which is substantially a hollow cylindrical configuration. An annular flange is provided on the first end face of the main framework 16, and the main framework 16 is flanged on the housing 1 by the flange. The first end face of the main framework 16 is also partially closed by the withdrawn annular shoulder 17. The annular shoulder (17) defines a reduced diameter gap as compared to the cross-section of the main framework (16). Due to the reduced diameter clearance, the bearings for the shaft 13 and the seal pack 18 are pressed against the abutment shoulder 19 of the housing 1. The bearing and seal pack 18 has in this case an axially spaced-apart ball bearing 20 with two radial seals 21 arranged therebetween. The bearing and sealing pack 18 is held and pressurized between the adjacent shoulder 19 in the intersecting wall of the housing 1 and the withdrawn annular shoulder 17 to fix the position of the shaft 13 in the axial direction. Rotation of the shaft 13 is possible in a sealing manner, since the sealing of the shaft 13 is made with respect to the crossing wall of the housing 1, via the radial seal 21. The liquid tightness of the crossing wall of the housing 1 is maintained.

및 I을 나타내는 움직일 수 있는 스위칭 위치 표시기가 있다. 이 목적을 위해, 메인 프레임워크(16)의 간극은 스위칭 위치 표시기의 위치들

및 I이 광학적으로 감지될 수 있게 한다. 또한, 스위칭 위치 표시기에 의해 작동되는 표시 접점이 스위칭 위치들

및 I을 묘사하기 위해 제공된다.The shaft 13 is connected to the first spindle 12 and the second spindle 14 through the coupling 22 at the end face. By means of the coupling 22, the rotational movement of the spindles 12, 14 can be transmitted through the shaft 13. On the threaded portion of the first spindle 12, the switching states of the switching contact pieces 7,

Lt; RTI ID = 0.0 > I < / RTI > For this purpose, the gap of the main framework 16 is determined by the positions of the switching position indicators

And I to be optically sensed. Further, the display contact operated by the switching position indicator is switched to the switching positions

And I. ≪ / RTI >

The drive housing 15 is connected to the main framework 16 at a second end face of the main framework 16 away from the housing 1. For this purpose, the bottom portion of the drive housing 15 in the form of a port is threaded by a threaded bore formed at the end of the tubular element of the main framework 16. A pipe stub-like entry element 23 is provided at the bottom. The pipe stub type entry element 23 is for mounting the second spindle 14 and the second spindle 14 is on the one hand the bearing of the shaft 13 and the sealing pack 18 and the coupling (22) and on the other hand is supported on a pipe stub-like entry element (23). To this end, the ball bearings 20, which are arranged one behind the other in the axial direction, are in turn inserted into the pipe stub-like entry element 23. In the region of the pipe-stub-receiving element 23, the first spindle 12 acts as a shaft. In the portion located between the ball bearings 20 in the pipe stub-receiving element 23, the first spindle 12 / shaft increases in cross-section. The increase of the cross section is in this case formed in such a way that on one hand the axial contact with the ball bearing 20 is formed and on the other hand the increase of the cross section results in the addition of the radially aligned gap 24 to the first spindle 12) / shaft or the increased section of the spindle 12 / shaft. The increase in cross-section of the radially aligned gap 24 and the dimension of the radial penetration depth is such that the resulting cross-sectional dimension of the radially aligned gap 24 is greater than the dimension of the first spindle 12 / Is maintained in the axial direction of the shaft (2). In which the spindle 12 / shaft is retained without threads in the mounting area of the spindle 12 / shaft so that the first spindle 12 / shaft is free from backlash-free rotation even with the pipe stub- Is provided in this case. Alternatively, a multi-piece configuration may be provided, and the spindle 12 may be provided with a separate, < RTI ID = 0.0 > The shaft is connected through a coupling.

A radially aligned gap 24 is provided from the blocking shoulder on the first spindle 12 / shaft. As a result, the first spindle 12 / shaft, which is part of the kinematic chain, can block the movement of the kinematic chain. In order to realize interruption of movement, a breaker 25 is provided. The circuit breaker 25 passes through an inline opening formed in the ported drive housing 15 outwardly, a substantially hollow cylindrical main framework 16 and a pipe stub-like entry element 23. Each clearance is arranged substantially in a straight line so as to be in the in-line range, in this case substantially radially with respect to the axis 2. [ In this case, the cross-sections of the individual gaps in the drive housing 15, the main framework 16 and the pipe stub-receiving element 23 may vary. The breaker (25) has a blocking element (26) which takes the form of a pin. The blocking element 26 has a shape complementary to the cross section of the radially aligned gap 24 at its end towards the radially aligned gap 24. For example, the radially aligned gaps 24 may have a circular cross-section; Accordingly, the barrier element 26 can have a circular cross-section of a complementary shape as its end toward the radially aligned gap 24. The blocking element 26 is supported on the pipe stub-like entry element 23 in a spring loaded manner. To this end, a spring 27 is mounted on the enlarged cross-section of the gap of the pipe stub-like entry element 23, which serves to guide the blocking element 26. The force effect of the spring 27 on the blocking element 26 is aligned in such a way that the blocking element 26 is pressed from the radially aligned gap 24.

In order to guide the blocking element 26, the breaker 25 has a guide sleeve 28. The guide sleeve 28 is fixedly inserted into the clearance of the drive housing 15 or the main framework 16 so that the blocking element 26 can slide within the guide sleeve 28. [ The direction of movement or the direction of displacement of the blocking element 26 is substantially radially aligned with respect to the axis 2. A tool receptacle 29 is provided at the end of the fin of the blocking element 26 remote from the radially aligned gap 24 to effect the locking of the blocking element 26. The tool receptacle 29 may, for example, have a shape coding in which a corresponding tool can be inserted. For example, the tool receptacle 29 can be constructed in a polygonal gap manner of a ward, such as a lock, so that the actuation of the blocking element 26 can be accomplished with a tool having a tool that can be placed or inserted in a complementary fashion. Can be carried out by the receptacle 29. Fig. Triangular or square wrench keys, warded wrenches, and profile wrenches have proved successful as tools. Preferably, the axial displacement of the blocking element 26 can overlap with its at least partial rotation. The rotation can be effected, for example, by the slotted link 32 through which the sensory element 31 is guided. The slotted link 32 permits limited guidance and position fixation of the locking element 26.

To protect the breaker 25 from contamination, the area of the breaker 25 accessible from the outside of the drive housing 15 is covered by the protective cap 30. The protective cap 30 may, for example, be made of an insulating material and enable elastomeric coating of the circuit breaker 25. However, correspondingly complicated structured flap covering may also be provided to act as protective cap 30.

The construction and guidance of the blocking element 26 of the breaker 25 will now be described by way of example on the basis of Fig. 3 shows a cross section through the breaker 25, and Fig. 4 shows a partial cutaway of the breaker 25. Fig. 3 and 4, the blocking element 26 is shown in its blocking position and the blocking element 26 is meshed with one of the radially aligned gaps 24 and also includes a radially aligned gap < RTI ID = 0.0 > And blocks the rotation of the driving crank 11 through the blocking shoulder of the crankshaft 24.

In a radial direction with respect to the displacement axis of the blocking element 26, the blocking element 26 has a pin 31 which acts as a sensing element. The pins 31 project into the slotted link 32 and are guided in a limited manner within the slotted link 32. Since the slotted link 32 has a substantially U-shaped profile in this case, the end position of the blocking element 26 is fixed to the free leg portion of the U-shaped profile, respectively. The free legs extend substantially transversely with respect to the axis of motion of the blocking element (26). Apart from the U-shaped profile of the slotted link, alternative arrangements of slotted links, which preferably secure the blocking element 26 by the pins 31 as far as possible, may also be provided. When operating the blocking element 26 by the tool, the tool receptacle 29 is set to rotate. The rotation of the blocking element 26 is possible only in a limited range due to the guidance of the pin 31 in the slotted link 32 and this rotation is achieved in the axial direction of the pin 31 and thus of the blocking element 26 It can overlap motion. In this case, in order to pass the two free legs of the U-shaped profile of the slotted link 32, the counter-rotating movement of the blocking element 26 is necessary in each case, The penetration depth of the blocking element 26 into the one is defined by the axial spacing of the free legs of the slotted link 32.

A plurality of radially aligned gaps 24 are located on the spindle 12 / shaft in the diameter increasing region. Preferably, eight, six, four or any other number of radially aligned gaps 24 may be disposed, for example, on the first spindle 12 / shaft. Depending on the number of radially aligned gaps 24 used, the maximum increment of the drive lever 11 required until there is a possible interception of the blocking element 26 or a possible entry into the radially aligned gap 24 Is variable. Due to the arrangement of the plurality of radially aligned gaps 24 a plurality of fastening of the first spindle 12 is possible and the switching state of the electric switching device is controlled by the first spindle 12 and the second spindle 14, Which remains virtually unchanged due to the transfer function of the < / RTI > However, if necessary, only a single radially aligned gap 24 may be provided to be provided on the spindle 12 or the mechanical element.

It is desirable to arrange the breaker 25 at least partially within the drive housing 15 such that the components movable relative to each other, such as the blocking element 26 and the spring 27, are mounted in the protective region of the drive housing 15 Do. Only the area of the circuit breaker 25 having a small surface area is shown in the drive housing 15 on the outside. By the use of the protective cap 30, it is possible to prevent contamination of the latter and contamination of parts in the drive housing 15.

Claims (13)

An electrical switching device comprising:
- a first switching contact piece (7) and a second switching contact piece (8) movable with respect to each other,
A kinematic chain (11, 12, 13, 14) for coupling movement to at least one of the switching contact pieces (7, 8), and
- a switching device (25) having a blocking element (26) for blocking the relative movement of the switching contact pieces (7, 8)
The blocking element 26 is capable of blocking at least one mechanical element of the kinematic chain 11, 12, 13, 14 at various positions while keeping the switching states of the switching contact pieces 7, Wherein the electric switching device comprises: The method according to claim 1,
Characterized in that the blocking element (26) acts on a rotatably mounted machine element. 3. The method according to claim 1 or 2,
Characterized in that the blocking element (26) is actuated by a tool, in particular a wrench. The method of claim 3,
Characterized in that in the drive housing (15), which is substantially rotationally symmetrical, the breaker (25) is accessible from the outside. The method according to claim 3 or 4,
Characterized in that, in order to operate the breaker (25), the tool must be placed outwardly on a drive housing (15) which is substantially rotationally symmetrical. 6. The method according to any one of claims 1 to 5,
Characterized in that the blocking element (26) is movable radially with respect to the rotational axis (2) of the machine element. 7. The method according to any one of claims 1 to 6,
Characterized in that the mechanical element is a shaft (12). 8. The method of claim 7,
Characterized in that the shaft (12) is mounted at an axial distance from a first bearing point and a second bearing point, the blocking element (26) acting between two bearing points. 9. The method according to any one of claims 1 to 8,
Characterized in that the blocking element (26) engages a gap (24) of the machine element. 10. The method according to any one of claims 7 to 9,
Characterized in that the shaft (12) has an increase in cross section in the region where the blocking element (26) acts. 11. The method according to any one of claims 1 to 10,
Characterized in that the breaker (25) is arranged on the housing (1) of the switching device. 12. The method of claim 11,
Wherein the housing (1) is a pressure vessel. 13. The method according to claim 11 or 12,
Characterized in that a surge arrester (4) with a disconnecting device is at least partly disposed in said housing (1).

Images