JP6393790B2 - Electrical switchgear - Google Patents

Description

The present invention relates to an electric switchgear, and the electric switchgear is
A first opening / closing contact and a second opening / closing contact which are movable relative to each other;
An interlocking mechanism (kinematische Kette) for connecting movement to at least one of the two open / close contacts,
A locking device with a locking component for locking the relative movement of both the opening and closing contacts,
Have

  An electric switchgear is known from Patent Document 1, for example. That document describes an electrical switching device having first and second switching contacts. These open / close contacts are movable relative to each other, and an interlocking mechanism is used to connect the movement to at least one of the open / close contacts. The interlocking mechanism has an electrically insulated handle, so that movement can be transmitted to one of both open and closed contacts under the intermediately located disk. A bolt is provided as a locking component, and the bolt can completely penetrate the disk and engage with a recess provided at a predetermined position corresponding to the position of the disk. In this case, the locking bolt is configured so that it can be inserted into the disk in the closed position and in the open position, whereby the relative positions of the first and second open / close contacts in the closed position or the open position. Can be securely held. In order to move these opening and closing contacts, the locking bolt can be completely removed from the disk.

This known electrical switchgear has a sturdy locking device in order to securely hold the two relative positions between the first and second switchgear contacts.
However, the operation of this locking device proved to be quite difficult. This is because the operation of the electrically isolated handle and the release or insertion of the lock bolt must be adjusted separately by each operator. For this reason, a state occurs in which the opening / closing position of the opening / closing contact must be held relatively reliably during the opening / closing of this known electrical switching device. Depends on adjustment. In addition, this locking device can only reliably hold the two open / close contacts at two predetermined relative positions.

German Patent Invention No. 10317735B3

  Accordingly, an object of the present invention is to configure an electric switchgear of the type mentioned at the beginning so that the lock device can be simplified and more reliably operated.

  According to the invention, the above-mentioned problem in the electrical switching device of the type mentioned at the outset is that the locking component places at least one mechanical element of the interlocking mechanism in various positions in the open / closed state in which both open / close contacts are kept the same. It is solved by making it possible to lock with.

  The electrical switch is for switching the current path. For this purpose, for example, a plurality of open / close contacts that can move relative to each other are used. At least one of these open / close contacts is associated with an interlocking mechanism for relative movement. This interlocking mechanism couples at least one of the open / close contacts to the drive device to cause the aforementioned motion. The drive device can be part of the interlocking mechanism. The electrical switchgear is a disconnector used, for example, in a surge current path of a surge arrester. The surge current path has a variable impedance control device having non-linear characteristics. In this surge current path, the phase conductor to be protected is connected to the ground potential. At this time, the surge current path is closed or cut off in accordance with the voltage applied to the control device with variable impedance. Thus, the phase conductor is protected by the surge arrester. In particular, the phase conductor or its electrical insulation can be protected from damage due to overvoltage. Phase conductors are part of high voltage equipment such as transformers, circuit breakers and the like. When the limit voltage is exceeded, a phase conductor electrical insulation flashover or overload occurs. This can lead to irreversible damage to the electrical insulation, especially in the case of non-self-healing insulators such as solid insulators. With a surge current path having an impedance device, it is possible to counter this. The control device with variable impedance has a rated voltage to enable this. The rated voltage of this variable impedance control device can be designed to correspond to the limit voltage of the phase conductor. Therefore, when the limit voltage of the phase conductor is exceeded, the variable impedance control device has a low impedance. In contrast, when the voltage falls below the limit voltage, the high impedance characteristic of the variable impedance control device appears. The voltage limitation achieved by the surge arrester device makes it possible in particular to protect the electrical insulation of the phase conductor.

  In particular, a varistor can be used as a variable impedance control device. The varistor is a non-linear resistance, and its impedance changes according to the applied voltage. The varistor can be used as a semiconductor, for example, as necessary. Metal oxides can be used to form varistors. In particular, zinc oxide varistors have proven effective. In order to increase the load capacity, for example, multiple blocks of zinc oxide devices can be stacked on top of each other, increasing the voltage strength of this varistor. In addition, to increase current strength, a number of variable impedance control devices, such as a number of stacks of metal oxides stacked on each other, can be electrically connected in parallel.

  During testing, for example, it is necessary to apply an overvoltage to the phase conductor that can cause a surge current path to be closed by a variable impedance control device. In preparation for this, the electrical switchgear can be installed in a surge current path, preferably in series with a variable impedance control device. By using this switchgear, the surge current path can be cut off electrically, so that the protective action of the variable impedance control device can be stopped. In this case, the electrical switchgear can be installed either on the high voltage side of the surge current path or on the ground potential side. By the interlocking mechanism, it is possible to operate a plurality of open / close contacts of the electrical switchgear that can move relative to each other. Depending on the location of these open / close contacts, that is, the potential, the interlocking mechanism can have an electrically insulating portion, thereby preventing a short circuit of the variable impedance control device.

  Preferably, the open / close state of the open / close device can be reliably held at a predetermined open / close position of the open / close contacts that can move relative to each other. That is, for example, the relative position of the open / close contacts can be reliably held in the closed state of the open / close contacts. In addition, in the closed state of the open / close contacts, the positions of the open / close contacts can be reliably held. In this case, the specification of the locking device to be used is determined as follows. That is, the driving force transmitted through the interlocking mechanism is received by the locking device, and as a result, a reliable block of movement is guaranteed, i.e., the transmission of force through the interlocking mechanism is prevented. It is decided.

  For example, the locking component of the locking device can be moved into one path of the mechanical element of the interlocking mechanism, so that, for example, the movement of the mechanical element is locked by the abutment of the locking component and the locking shoulder. The mechanical element or the interlocking mechanism is fixed. If this locking device is configured to lock various positions of the machine element to be locked in one and the same open / close state, only the position of the interlocking mechanism can be fixed. It is also possible to change this. That is, since the lock component can be repeatedly engaged with the machine element, the movement of the interlocking mechanism can be locked with a smaller step width. Thus, for example, by adapting the clearance of movement in the interlocking mechanism, even if there is movement of the mechanical element, the plurality of open / close contacts remain relatively stationary relative to each other, and the open / close state is maintained. . The screw shaft drive can be configured to be a part of this interlocking mechanism, in which case the rotation of the machine element drives the screw shaft and, based on that, the nut covered on the screw shaft Axial displacement can be performed. In this case, advantageously, the reverse action of the movement caused by the open / close contact can be blocked by the screw shaft drive, so that the locking device can be separated from the force caused by the open / close contact. There are benefits. In this regard, the locking device substantially helps to prevent the drive movement that can be transmitted via the interlocking mechanism from acting on the open / close contact. Apart from the preferred locking function by the screw shaft drive, the movement of the movement providing sufficient clearance within the interlocking mechanism takes place so that the locking component can lock various positions of the machine element, thereby No change in the open / closed state of the device is caused. For example, the locking component shall be engaged in one recess of the machine element, in which case the machine element shall have a number of locking shoulders which are in the position of the machine element. Accordingly, it can be sequentially engaged with the locking component. In this way, a mechanical element can be fitted and coupled via the locking component. In order to form the locking shoulder, the machine element can be configured with a recess into which the locking component can engage, so that the movement of the machine element is locked. Further, the locking shoulder may be formed so as to protrude from the surface as a protrusion (for example, a protruding corner). In this case, according to the shape of the locking shoulder, the locking device can be locked with a clearance, thereby enabling the locking component to be smoothly locked or unlocked. Furthermore, the locking device can be configured such that only one direction of locking is performed, in which case the movement of the machine element is allowed when the direction is reversed. Furthermore, the locking device can also be configured to lock the movement of the machine element in the locked state and to completely lock all movements of the interlocking mechanism based thereon.

  In another advantageous form, the locking component can be configured to engage a mechanical element that is rotatably supported.

  The rotationally supported machine element described above has the advantage that the machine element is stationary in the rotary bearing, in which case one rotation (in cooperation with the locking component) A number of locking shoulders (in some cases) can pass through the locking component many times. This allows the locking component to be provided with a large number of locking shoulders and ensures that the mechanical element can be held in various relative positions. Thus, when the machine element is rotated, motion clearance is allowed in the locked state, for example, depending on the position and number of locking shoulders provided. Depending on the degree of subdivision of these locking shoulders, the machine element can be fixed in various states, coarse or finer.

  In another advantageous form, the locking component can be configured to be operated using a tool, in particular a key.

  By using a tool, the amount of force used to operate the locking device can be controlled. This tool can be used to increase or decrease the force action. Further, by using the tool, it is possible to ensure the security that only the person who owns the tool can operate the locking device and as a result, the electric switchgear can also be operated. . This tool can be made, for example, in the form of a key, so that the degree of safety becomes higher when the electric switchgear or the lock device is operated. A further advantage is that the locking device can be installed, for example, in an area protected from the effects of wind and rain, so that the use of the tool will only require access to the locking device with that tool There is also. Thereby, the opening for operating the locking device in the housing can be held, for example, in a small area so that only access using the tool is allowed. Thus, the operational safety of the locking device is further improved.

  In another preferred form, the locking device is configured to be accessible on the outer casing of the substantially rotationally symmetric drive casing.

  A rotationally symmetrical drive casing has the advantage of being easy to manufacture. Further, since a structure having no protrusion is obtained on the mantle portion side, the drive device casing is hardly damaged mechanically. This drive device casing can accommodate, for example, a gear that is a part of the interlocking mechanism. In order to drive the interlocking mechanism, for example, motion can be introduced in the drive casing. For example, the drive casing can be provided with a crank, so that the movement can be manually coupled to the interlocking mechanism. In this case, for example, a gear of the interlocking mechanism can be installed in the drive device casing, and thereby, the gear can be geared down and / or geared up. Placing access to the locking device on the mantle has the advantage that the movement of the movement, for example by means of a crank, can be effected at the end face, for example. In this case, the rotational movement can be connected substantially concentrically to a substantially rotationally symmetric drive casing. Access at the mantle is beneficial to avoid crossing movements. Thus, the driving motion can be surely introduced into the interlocking mechanism at the end face, and the lock device can be operated as necessary at the mantle.

  For example, a tool receiving portion for receiving a tool for operating the locking device can be installed in the mantle. That is, for example, a lock corresponding to a key-shaped tool can be disposed on the outer casing of the drive device casing. In this case, the operation surface of the mantle portion in the drive device casing can be covered with a protective cap disposed as necessary. This allows not only the locking device but also other components present in the drive casing to be protected from external influences such as, for example, moisture and dirt.

  More preferably, in order to operate the locking device, the tool may be installed on the outer casing of the drive device casing which is substantially rotationally symmetric.

  The tool can be inserted in the outer casing into a substantially rotationally symmetric drive casing. More preferably, the tool may be applied in a direction perpendicular to the rotation axis of the drive device casing. Furthermore, it is preferable that the locking component is configured to be movable from the radial direction with respect to the rotation axis of the machine element. A radial direction with respect to the axis of rotation of the machine element is advantageous. This is because the locking component and the locking shoulder can be mutually engaged in the circumferential direction of the machine element. Preferably, the rotational axis of the machine element is aligned so as to be in line with the rotational axis of the rotationally symmetrical drive casing. By doing so, it is possible to carry out the alignment of the operating shaft, that is, the mantle portion in the direction in which the tool is applied, by a simple method.

  Furthermore, it is preferred that the mechanical element is a shaft.

  The shaft is a mechanical element that can be rotationally supported and has one rotational axis. Since the shaft is rotatable about its axis of rotation, a locking component can interact with this shaft, especially from a radial direction with respect to the axis of rotation of this shaft. For this purpose, the shaft has at least one corresponding locking shoulder. The locking shoulder can be formed by a recess in this shaft or by a locking shoulder on the shaft (eg, a profiled shaft). This shaft can be implemented, for example, in part in the form of a spindle, polyhedron, crank, or the like.

  In another preferred form, the shaft is supported at first and second axially spaced support points, between which the locking component engages.

  By supporting the shaft at two support points, a reliable guide of the shaft and rotation without play is possible. By separating the two support points in the axial direction, the locking component can be engaged between the support points. In this way, a strongly bonded structure is obtained. For example, the support points may be configured to function as axial stoppers, thereby ensuring that the shaft is held in its current position. As these support points, for example, a plurality of ball bearings can be used, and these ball bearings can lock the axial movement of the shaft.

  In another preferred form, the locking component can be configured to engage a recess provided in the machine element.

  The recess in the machine element can form a locking shoulder on the shaft or on the machine element, and the locking component can cooperate with this machine element and realize its locking function. In this case, the indentation can result in a mechanical element or shaft cross-section change. For example, the shaft can have a polyhedral, e.g., tetrahedral or hexahedral structure, so that a number of shoulders can be formed on the outer periphery of the shaft, and these shoulders and the locking component cooperate. It can be made to show. In this way, the machine element can be fixed a plurality of times during one rotation of the machine element, depending on the number of shoulders extending over the outer jacket portion of the shaft. Furthermore, the shaft may have a recess in the shape of a bag hole with which a locking component can be engaged. That is, depending on the shape of the recess, the lock realized by the locking component can generally have a large clearance, albeit with some differences. Preferably, the machine element is provided with a recess made in a complementary shape to the locking component. If a number of depressions are provided in the machine element, the axes of those depressions in the locking shoulder should be aligned substantially radially or tangentially or at right angles to the axis of rotation of the machine element. is there.

  In another preferred form, the shaft can be configured to have an enlarged cross-section at the portion where the shaft and locking component engage.

  By enlarging the cross section, a plurality of locking shoulders can be provided on the surface of the mechanical element of the interlocking mechanism. Furthermore, by enlarging the cross section, it becomes possible to provide the machine element with a plurality of depressions, for example, a plurality of pouch-shaped depressions. In this case, since the cross section is enlarged, a plurality of locking shoulders As a result, sufficient mechanical stability of the mechanical element, for example, the shaft, is obtained. Besides increasing the mechanical strength of the machine element due to the cross-section enlargement, this cross-section enlargement serves to limit the axial displacement of the machine element, in particular the shaft. For example, there can be a plurality of support points for the shaft or machine element following the cross-section enlargement or on both sides of the cross-section enlargement, these support points being Allow rotational movement but prevent axial movement.

  In another preferred form, the locking device can be arranged in the housing of the switchgear.

  The housing of the switchgear serves to create a mechanical boundary for the switchgear. In this case, the opening / closing device has an opening / closing mechanism, and in particular, the opening / closing mechanism has a plurality of opening / closing contacts that can move relative to each other. The opening / closing mechanism should be at least partially disposed within the housing. In this case, the housing surrounds and forms the boundary of the opening / closing mechanism. For example, the opening / closing mechanism can be disposed in a surge current path including a surge arrester as described at the beginning. The variable impedance control device can be at least partially disposed within the housing. Accordingly, the surge current path can also be disposed at least partially within the housing. The housing itself can be made conductive or electrically insulating as required, and can have different potentials. In the case of a conductively formed housing, it is preferably at ground potential. The locking device can be supported, for example, in a drive device casing, in which case this drive device casing is installed in the housing of the switchgear. For example, the drive device casing can be flanged to the housing of the switchgear. This is advantageous for making repairs simple and inexpensive.

  In another preferred form, the housing can be configured to be a pressure vessel.

  A pressure vessel is a vessel in which the medium can be sealed and confined, and the medium can be placed under negative or overpressure inside the housing. Preferably, an electrically insulating fluid can be placed in the pressure vessel, which takes over the electrical insulation of the conductive parts present inside the pressure vessel. For example, a plurality of open / close contacts can be electrically insulated with this electrically insulating fluid. For this purpose, these open / close contacts can be immersed in an electrically insulating fluid. It has been found that fluorine compounds such as sulfur hexafluoride, fluoroketone and fluoronitrile are particularly suitable as the electrical insulating fluid. However, other fluids such as carbon dioxide, nitrogen, washed air, etc. can be used. It is preferable that these fluids exist in the pressure vessel in a gas state. However, it is also possible for the fluid to be liquid, or partially gaseous and partially liquid, to be inside the housing. Furthermore, the formation of a fluid-tight housing (although this is not necessarily a pressure-resistant housing) has the advantage that at least the fluid can be confined and there is no need to worry about inconvenient dissipation of the fluid.

  In another preferred form, a surge arrester, in particular with a disconnect, can be arranged at least partly inside the housing.

  The surge arrester device has a surge arrester. As the surge arrester, for example, a non-linear variable impedance control device such as a varistor can be used. In this case, the surge arrester is a part of the surge current path, and the surge current path particularly extends from the phase conductor to be protected to the ground potential. In particular, a disconnector can be arranged in this surge current path. This disconnector is also called an electrical switchgear and has first and second switching contacts that can move relative to each other.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

It is a cross section of an electric switchgear. It is a cross section of the drive device provided with the locking device. It is a cross section of a locking device. Partially cut locking device.

  FIG. 1 is a cross-sectional view of an electrical switchgear. This electric switchgear has a housing 1. The housing 1 is formed in a substantially hollow cylindrical shape and has a substantially circular cross section. The housing 1 extends concentrically with respect to the main shaft 2. The housing 1 has a metal base, which is at ground potential. One end of the base of the housing 1 is formed of an electrically insulating disk insulator 3. In this case, since the housing 1 itself is formed as a fluid-tight housing 1, the inside of the housing 1 can be filled with an electrically insulating fluid, and unintentional dissipation of the filled fluid is prevented. The conductive portion of the housing 1 has a ground potential.

  The housing 1 houses a surge arrester 4 in a direction substantially in line with the main shaft 2. The surge arrester 4 functions as a variable impedance control component and has an impedance characteristic that changes in accordance with a voltage applied thereto. That is, the surge arrester 4 is a nonlinear impedance device. The surge arrester 4 is preferably made of a metal oxide, in particular zinc oxide. For example, a number of metal oxide blocks can be stacked, electrically connected to each other, and combined into a single mechanically stable combination. The surge arrester 4 is a part of the surge current path, and the high voltage side end portion 5 of the current path has, for example, a high voltage potential. For this reason, the phase conductor not shown in FIG. 1 is in contact with the high voltage side end portion 5 of the surge arrester 4 through the phase conductor portion. In this case, the phase conductor part crosses the disk insulator 3 under fluid tightness. The surge arrester 4 is mechanically held relative to the housing 1. In the surge current path, the surge arrester 4 has a ground side end 6 opposite to the high voltage side end 5. A first opening / closing contact 7 and a second opening / closing contact 8 are disposed in the surge current path at the ground end 6. Both of these open / close contacts 7 and 8 are part of the open / close device and can move relative to each other. In this case, the first opening / closing contact 7 is formed in a bush shape, and the bush side is in constant contact with the ground side end 6 of the surge arrester 4. The second opening / closing contact 8 is supported so as to be movable, and is formed into a bolt shape. Here, the cross section of the second opening / closing contact is formed in a shape complementary to the bush opening of the first opening / closing contact 7. The second opening / closing contact 8 is constantly applied with a ground potential. When the second opening / closing contact 8 is in electrical contact with the first opening / closing contact 7, the ground potential is set to the first opening / closing contact 7, And it has the function to transmit to the earth side edge part 6 of the surge arrester 4. For this purpose, the second opening / closing contact 8 is supported in the sliding bush 9 so as to be displaceable. The sliding bush 9 is supported by the housing 1, particularly at a portion having the ground potential of the housing 1, so that it is possible to easily apply the ground potential to the sliding bush 9. Due to electrical contact with the sliding bush 9, the ground potential is also applied to the second opening / closing contact 8. The second opening / closing contact 8 is configured so as to be displaceable in the longitudinal direction of the main shaft 2.

  In another embodiment, the switching contacts 7 and 8 that can move relative to each other can be arranged at the high voltage side end 5 of the surge arrester. Regardless of the position of the switching contacts 7, 8, the surge arrester 4 and the switching contacts 7, 8 that can move relative to each other must be electrically connected in series in the surge current path.

  In order to cause relative movement of the open / close contacts 7, 8, a drive device 10 is arranged in the housing 1. The drive device 10 can be a part of the interlocking mechanism, and the motion generated outside the housing 1 is converted by this interlocking mechanism, passes through the wall of the housing 1, and both the opening / closing contacts 7, 8 is transmitted to at least one of them. In this case, the penetration of the interlocking mechanism is preferably performed through the housing 1 so as to ensure the maintenance of the fluid tightness of the wall to be penetrated. The interlocking mechanism has a drive crank 11 and is manually rotated using this. The rotation of the drive crank 11 is transmitted to the first screw shaft, which is subsequently coupled to the shaft 13. The shaft 13 passes through the wall of the housing 1 and is provided to allow fluid-tight movement of the interlocking mechanism. The shaft 13 is coupled to the second screw shaft 14 inside the housing 1. The second screw shaft 14 is surrounded by the screw of the second opening / closing contact 8. The second opening / closing contact 8 is supported so as to be displaceable in the axial direction and is guided while being prevented from rotating. Therefore, the second opening / closing contact 8 is moved in the axial direction by the rotation of the second screw shaft. Will occur. In order to support the various parts of the interlocking mechanism, the drive device 10 is further configured to have a drive device casing 15.

  The drive device 10 shown in FIG. 1 is enlarged and shown in FIG. The drive device 10 has a substantially hollow cylindrical base frame 16. The first end portion of the base frame 16 is provided with an annular flange, and the base frame 16 is flanged to the housing 1 via this. This first end of the base frame 16 is further partially closed with a recessed annular shoulder 17. The annular shoulder 17 is in contact with a hole having a smaller diameter than the cross section of the base frame 16. The bearing / seal package 18 for the shaft 13 is pressed against the mounting shoulder 19 of the housing 1 through the hole having a small diameter. The bearing / seal package 18 has a plurality of axially spaced ball bearings 20 between which two radial seals are disposed. Since the bearing and seal package 18 is held between and pressed against the mounting shoulder 19 and the recessed annular shoulder 17 in the transverse wall of the housing 1, the position of the shaft 13 is axial. It will be securely held in the direction. The radial seal 21 seals the shaft 13 against the transverse wall of the housing 1 so that the shaft 13 can be rotated in a sealed state. The fluid tightness of the transverse wall of the housing 1 continues to be maintained.

  The shaft 13 is coupled to the first screw shaft 12 and the second screw shaft 14 at the ends thereof via a plurality of couplings 22. By means of the coupling 22, the rotational movement of the screw shafts 12, 14 can be transmitted via the shaft 13. A movable opening / closing position detector is installed on the screw of the first screw shaft, which displays the opening / closing states φ and I of the opening / closing contacts 7 and 8. Thereby, the states φ and I of the open / close position detector can be visually recognized through the plurality of holes of the base frame 16. In addition, a plurality of signal contacts are provided for indicating the open / close positions φ and I, which are actuated by an open / close position detector.

  A drive device casing 15 is coupled to the base frame 16 at the second end of the base frame 16 on the side opposite to the housing 1. For this purpose, a plurality of screw holes are formed at the end of the pipe-shaped component of the base frame 16, and the floor portion of the drive device casing 15 formed in a bowl shape is screwed through these screw holes. Has been. A bracket-like lead-in part 23 is provided on the floor part. The bracket-like lead-in portion 23 is provided for supporting the second screw shaft 14, whereby the second screw shaft is on the one hand the bearing / seal package 18 of the shaft 13 and an intermediate coupling therebetween. On the other hand, it is supported by a bracket-like lead-in part 23 via 22. For this purpose, a plurality of ball bearings 20 are similarly inserted in the bracket-shaped lead-in part 23, and these are similarly positioned apart from each other in the axial direction. In the region of the bracket-like lead-in part 23, the first screw shaft 12 functions as a shaft. In the intermediate portion of the plurality of ball bearings 20 in the bracket-shaped lead-in portion 23, the cross section of the first screw shaft 12 / shaft is large. In this case, the enlarged cross section is formed as follows. That is, on the one hand, an axial contact with the ball bearing 20 is made, and on the other hand, due to this cross-sectional enlargement, a plurality of indentations 24 aligned in the radial direction are formed on the first screw shaft 12 / shaft or on the first The screw shaft 12 / the shaft is provided at a portion where the cross section is enlarged. In this case, the selection of the dimensions of the cross-sectional enlarged portion and the radial recess depth of the radially aligned recesses 24 is performed as follows. That is, the reduction of the cross section due to the radially aligned recesses 24 is performed so that the cross section of the first screw shaft 12 / shaft in the axial direction of the main shaft 2 is kept constant. Here, in the support portion of the screw shaft 12 / shaft, since the screw shaft 12 / shaft is held without a screw, there is no play of the first screw shaft 12 / shaft even in the bracket-like lead-in portion 23. Rotation support is possible. As an alternative, a multi-part arrangement is also possible, in which case the screw shaft 12 is connected via a coupling to, for example, another shaft having a cross-section substantially corresponding to FIG. It can support in the shape drawing-in part 23.

  A plurality of radially aligned recesses 24 are provided in the first screw shaft 12 / shaft by a locking shoulder. Thus, the first screw shaft 12 / shaft is in a state of locking the movement of the interlocking mechanism as a part of the interlocking mechanism. In order to realize the movement lock, a locking device 25 is provided. The locking device 25 passes through a plurality of linearly arranged openings provided in the outer cover portion of the bowl-shaped drive device casing 15, the substantially hollow cylindrical base frame 16 and the bracket-like lead-in portion 23. . In this case, since each hole is arranged substantially linearly, there is a linear extension line substantially in the radial direction with respect to the main shaft 2. In this case, the cross-sections of the individual holes in the drive device casing 15, the base frame 16, and the bracket-shaped lead-in portion 23 may be different. The locking device 25 has a locking component 26 which is substantially bolt-shaped. The locking component 26 has an end on the side of the radially aligned indentations 24 having a shape that is complementary to the cross-section of the radially aligned indentations 24. For example, the radially aligned depressions 24 can have a circular cross section, and accordingly, the locking component 26 can be complementarily shaped with a circular cross section at the end on the side of the radially aligned depressions 24. It can have. The lock component 26 is urged by a spring and is supported by the bracket-like lead-in part 23. For this purpose, the spring 27 is supported in an enlarged section of the hole in the bracket-like lead-in part 23 (which serves as a guide for the locking component 26). The action of the force of the spring 27 on the locking component 26 is directed so that the locking component 26 is pushed away from the radially aligned recess 24.

  In order to guide the locking component 26, the locking device 25 has a guide sleeve 28. The guide sleeve 28 is fixed in place and inserted into a hole in the drive device casing 15 or the base frame 16 so that the locking component 26 can slide in the guide sleeve 28. The direction of movement or displacement of the locking component 26 is aligned substantially radially with respect to the main axis 2. In order to fix the lock component 26, a tool receiving portion 29 is provided at the end of the bolt of the lock component 26 opposite to the radially aligned recess 24. The tool receiving portion 29 can have, for example, a shape-encoded shape, and a corresponding tool can be inserted therein. For example, since the tool receiving portion 29 can be a polygonal hole of a ward lock or a similar method, the tool receiving portion 29 can be inserted through the tool receiving portion 29 only by a tool that can be covered or inserted in a complementary shape. All the lock components 26 can be operated. As such a tool, for example, a triangle key, a square key, a ward key, a profile key and the like have been found suitable. Preferably, one that overlaps at least a partial rotation with the axial displacement of the locking component 26 may be employed. The rotation can be forcibly performed by, for example, the slot link 32 in which the pin 31 is guided. The slot link 32 can forcibly guide the lock component 26 and secure its position.

  In order to protect the locking component 26 from contamination, the part of the locking device 25 accessible outside the drive device casing 15 can be covered with a protective cap 30. The protective cap 30 can be made of, for example, an insulating material, and can elastically cover the lock device 25. However, as the protective cap 30, a more foldable foldable cover can also function.

  Based on FIG. 3, the configuration and guidance of the locking component 26 of the locking device 25 will be described as an example. FIG. 3 shows a cross section of the locking device 25, and FIG. 4 shows a partial cut of the locking device 25. In both FIG. 3 and FIG. 4, the locking component 26 is shown in its locked position, in which case the locking component 26 engages one of a plurality of radially aligned recesses 24; The rotation of the drive crank 11 is locked through the locking shoulders of the plurality of depressions 24 aligned in the radial direction.

  The lock component 26 is provided with a pin 31 that functions as a contact element in the radial direction with respect to the displacement axis of the lock component 26. The pin 31 protrudes into the slot link 32 and is forcibly guided in the slot link 32. In this case, since the slot link 32 has a substantially U-shape, the end portions (both ends) of the movement of the lock component 26 are defined by both ends of the U-shaped free leg (free stroke). The Rukoto. The free leg basically extends along the axis of movement of the locking component 26 in the lateral direction. In addition to the U-shape of the slot link, as an alternative, it is possible to adopt a slot link configuration in which the lock component 26 can be suitably fixed by the pin 31. When the lock component 26 is operated with a tool, the tool receiving portion 29 is rotated. Due to the guidance of the pin 31 in the slot link 32, the locking component 26 can only be rotated within a limited range, in which case the rotation of the pin 31 and consequently of the locking component 26 is axial. Superimposed with motion. In this case, in order to pass between the ends of both free legs of the U-shaped profile of the slot link 32, a rotational movement in the opposite direction of the locking component 26 is required each time. Depending on the axial spacing between the ends of both free legs, the penetration depth of the locking component 26 into one of the radially aligned recesses 24 is defined.

  A large number of recesses 24 aligned in the radial direction are arranged in the cross-sectional enlarged portion of the screw shaft 12 / shaft. Suitably, for example, 8, 6, 4 or any other number of radially aligned indentations 24 may be located on the first screw shaft 12 / shaft. Depending on the number of radially aligned recesses 24 provided, the drive crank 11 is required up to the block, i.e. before the locking component 26 enters into the radially aligned recesses 24. The maximum step width can be changed. By arranging a large number of recesses 24 aligned in the radial direction, the first screw shaft 12 can be fixed in multiple stages. In this case, there is essentially no change in the open / close state of the electrical switchgear based on the transmission function of the first screw shaft 12 and the second screw shaft 14. However, if necessary, it is also possible for the screw shaft 12 or the machine component to be provided with only one radially aligned recess 24.

  In positioning the locking device 25 at least partially within the drive device casing 15, preferably a relatively moving part, such as a locking component 26, a spring 27, is protected in the drive device casing 15. It is also possible to arrange it so that it is supported within. Only the portion of the locking device 25 having a small surface area is visible on the outer jacket side of the driving device casing 15. By using the protective cap 30, it is possible to prevent the contamination and contamination of the components inside the drive device casing 15.

DESCRIPTION OF SYMBOLS 1 Housing 2 Spindle 3 Disc insulator 4 Surge arrester 5 High voltage side end 6 Ground side end 7 First opening / closing contact 8 Second opening / closing contact 9 Sliding bush 10 Driving device 11 Driving crank 12 First Screw shaft 13 Shaft 14 Second screw shaft 15 Drive device casing 16 Base frame 17 Annular shoulder 18 Bearing / seal package 19 Mounting shoulder 20 Ball bearing 21 Radial seal 22 Coupling 23 Bracket-like lead-in part 24 (Align in radial direction) 25) Locking device 26 Locking component 27 Spring 28 Guide sleeve 29 Tool receiving portion 30 Protective cover 31 Pin 32 Slot link

Claims (13)

An electrical switchgear,
A first opening / closing contact (7) and a second opening / closing contact (8) which are movable relative to each other;
A chain mechanism (11, 12, 13, 14) for coupling movement to at least one of the two open / close contacts (7, 8);
A locking device (25) with a locking component (26) for locking the relative movement of both said opening and closing contacts (7, 8);
In an electrical switchgear having
The open / close contacts (7, 8) are maintained in an open or closed state, and the relative positions of the open / close contacts (7, 8) in the closed state or the open state are securely held. lock component (26), an electrical switchgear according to claim <br/> to lock at least one of the machine elements at various locations of the chain mechanism (11, 12, 13, 14). The electric switchgear according to claim 1,
Electrical switchgear characterized in that the locking component (26) engages a rotatably supported mechanical element. The electric switchgear according to claim 1 or 2,
Electric switchgear characterized in that the locking component (26) is operated by a tool. The electric switchgear according to claim 3,
Electric switchgear characterized in that the locking device (25) is accessible at the outer shell of a substantially rotationally symmetric drive device casing (15). The electric switchgear according to claim 3 or 4,
Electric switchgear characterized in that the tool is installed on the outer jacket of a substantially rotationally symmetric drive device casing (15) for operating the locking device (25). The electric switchgear according to any one of claims 1 to 5,
Electric switchgear characterized in that the locking component (26) can be moved radially with respect to the axis of rotation (2) of the machine element. The electric switchgear according to any one of claims 1 to 6,
An electrical switchgear characterized in that the mechanical element is a shaft (12). The electric switchgear according to claim 7,
The shaft (12) is supported at first and second support points that are axially separated, and the locking component (26) is engaged between both support points. Electric switchgear. The electric switchgear according to any one of claims 1 to 8,
Electric switchgear characterized in that the locking component (26) engages a recess (24) provided in the mechanical element. The electric switchgear according to any one of claims 7 to 9,
Electric switchgear characterized in that the shaft (12) has an enlarged cross section at the part engaging the locking component (26). The electric switchgear according to any one of claims 1 to 10,
Electric switchgear characterized in that the locking device (25) is arranged in a housing (1) of the switchgear. The electric switchgear according to claim 11,
An electrical switchgear characterized in that the housing (1) is a pressure vessel. The electric switchgear according to claim 11 or 12,
An electrical switchgear characterized in that a surge arrester (4) provided with a disconnector is arranged at least partially inside the housing (1).