EP3131106B1 - Locking device for a high-voltage switchgear installation - Google Patents

Description

TECHNICAL AREA

The present invention relates to a device for locking an access for the operation of two switching devices of a high-voltage switchgear according to the introductory part of patent claim 1.

The high voltage switchgear includes an actuator which transmits driving force from a drive shaft to a contact assembly of a first and a contact assembly of a second of the two switching devices. Both switching devices have different functions and are generally suitable for connecting or disconnecting electroless or virtually de-energized circuits. Such switching devices are often used as a circuit breaker earthing switch system on the transformer side or as a start-up switch grounding system on the generator side of a high voltage switchgear, which is designed as a generator switch system and then typically operated at rated voltages between a few kV and 70 to 80 kV. However, they can also be used in gas-insulated or outdoor switchgear installations with nominal voltages of up to 1000 kV. The generally single-phase formed switch systems are mechanically interconnected when used in multi-phase high-voltage switchgear coupling rods.

The two switching devices can assume three switching positions. In a neutral position, both switching devices are open, in a first active position, the first switching device, such as a circuit breaker, closed and the second, for example, a grounding switch, opened and in the second active position, the first switching device is open and the second closed. To prevent one of these three switch positions is activated, if the two switching devices occupy one of the remaining two switching positions, the high-voltage switchgear requires a locking device, which blocks access to the operation of the two switching devices, if suburb, for example by means of a hand crank, are switched should.

STATE OF THE ART

A locking device for generator switch is in EP 1 933 345 B1 described. This device comprises two ratchet wheels arranged on an actuating shaft, one of which can be blocked by turning the shaft clockwise with a first two pawls and the other with a counterclockwise rotation by means of the second pawl. An access to actuation of a generator switch can be locked in this way.

Devices which transmit driving force from a clockwise or counterclockwise rotatable drive shaft to a contact arrangement of a first and a contact arrangement of a second switching device of a high-voltage switchgear, so-called three-position drives are described in DE 37 10 374 A1 . WO 02/080 323 A1 and JP 2002/152922 A ,

In the two first-mentioned actuators ( DE 37 10 374 A1 and WO 02/080 323 A1 ) is mounted on the axis of a movable contact, which is electrically conductively contacted depending on the angle of rotation with a fixed contact of a circuit breaker or a fixed contact of a grounding switch or in a neutral position with neither of the two fixed contacts. Depending on the angle of rotation, therefore, there are three positions, of which in a first position the earthing switch is closed and the disconnecting switch is opened, in a second the disconnecting switch is closed and the grounding switch is open and in a third the disconnecting and grounding switches are open. Since the movable contact is contactable with the two fixed contacts of the circuit breaker and the earthing switch, all contacts must have a diameter sized for both switches, although a smaller diameter would suffice for one of the two switches. This increases the cost and space requirements of the actuator.

In the latter actuator ( JP 2002/152922 A ) are fixed to the driven axis three scenes. Each gate controls the movement of a moving contact of a three associated switching devices. This actuator according to the prior art after DE 37 10 374 A1 a driveshaft driving Maltese cross gear, which ensures that the switching devices can only have prescribed switching states. For Each of the three switching devices requires this actuator a separate backdrop, which is installed instead of a commonly used linkage in the associated switching device.

A further actuator with a drive shaft, which is rotated in a first active position of the two switching devices by a base angle clockwise and in a second active position of the two switching devices to the base angle in the counterclockwise direction relative to the angular position of the drive shaft in a neutral position of the two switching devices is in the German patent application file number filed on 7 July 2015 10 2915 110 971.9 described.

A high voltage switchgear, in which an actuator of the type mentioned above can be used, describes the product brochure "Generator Circuit Breaker Systems HECS" from. ABB Switzerland AG, Zurich / Switzerland (1HC0072302 E02 / AA09). This high-voltage switchgear is designed as a generator switch system and has on the transformer side of a load-switching pole of a generator switch a circuit breaker earthing switch system and on the generator side of the switch pole on a start-up switch grounding switch system. EP-A1-1933345 discloses a device according to the preamble of claim 1.

PRESENTATION OF THE INVENTION

The invention, as indicated in the claims, the object is to provide a locking device of the type mentioned, which is simple and compact and increases the reliability of a equipped with this locking device high-voltage switchgear. According to the present invention, a device for locking an access for the operation of two switching devices of a high-voltage switchgear by means of a drive force to the two switching devices transmitting drive shaft is provided which in a first active position of the two switching devices by a base angle clockwise and in a second active position of the two Switching devices is rotated by the base angle counterclockwise relative to their angular position in a neutral position of the two switching devices.

This locking device has a locking disk attached to the drive shaft, a tilting rocker assembly comprising at least four rocker arms and a slide, wherein the slide suburb is feasible in two positions, of which the first releases an access for the operation suburb and an access for the operation of the Remote blocks and the second blocked the access for the local operation and the access for the remote control releases, which can engage in the first position of the slide a first rocker bar in the first active position and a second rocker bar in the second active position in the lock washer depending on the location and in the neutral position, a third and a fourth rocker bar can engage in the lock washer and wherein the slider in its second position blocks the first and the second rocker bar.

The locking device according to the invention is simple and compact and can be retrofitted with little effort in the high-voltage switchgear. The locking device allows trained, authorized personnel suburb access for a manual operation of the two switching devices resp. to lock or unlock the access for actuation of the two switchgear by means of motors controlled by a remote control room. It has, with the slide on one side and the rocker bar assembly and the lock washer on the other side on two independently operable mechanical components, but cooperate in the operation of the high-voltage switchgear during a locking process or an unlocking process. By independently operating the slide and the tilting pad assembly can be activated with the slide suburb access for remote operation or for the local operation of the two switching devices or blocked. After activation of the access for on-site operation, the two switching devices can be unlocked with the rocker arm assembly suburb, manually placed with a hand crank in the neutral position or in one of the two active positions and then locked with the rocker arm assembly and the locking disc. Since this only simple and robust mechanical components, such as the slide, the locking washer and the tilting bolt assembly are needed, the locking device according to the invention in a simple and compact design is characterized by a high degree of ease of use and high reliability.

The slide and the four tilting bars can each be rotatably mounted in one of five locks guided by a housing wall onto an operating side of the locking device.

The slider can be guided from the first to the second by turning a key inserted in the associated lock and from the second to the first position by rotating it counterclockwise. After removing the key, the slider can be locked in the first or second position.

Each of the four rocker bars can be guided by turning a key inserted into the associated lock and pulling it into a closed position, in which the rocker bar engages the locking disk to form a positive fit, and by reinserting the key and rotating it counterclockwise into an open position in which the rocker bar is out of engagement with the lock washer, each of the four rockers being locked in the closed position after removal of the key.

On the side facing away from the operating side of the housing wall, the slider may have a tie with two edge recesses and the first resp. the second rocker bar can each one provided with an edge recess first resp. have second circular disc, wherein in the second position of the slider, the tie is retracted to form positive locking in the edge recess of the first and the edge recess of the second circular disc, and wherein in the first position of the slider, the two edge recesses of the tie a blockage of the first resp. pick up the second rocker bar.

The slider may have an arm which, in the second position of the slider, turns on a switching element which serves to turn on and off a power supply for remote operation of the system.

The locking disc can have recesses and when locking can engage to form positive engagement in the first active position of the first tilting block and in the second active position of the second tilting block in a first of the recesses and can in the neutral position of the third and the fourth tilting block in a second of these recesses intervention.

The third and the fourth tilting bar can be acted upon against its direction of rotation from the open to the closed position with a biasing force. The Biasing force can be applied by two torsion springs, with one end of at least one of the two springs fixed and the other end held on one of the two rocker bars. The biasing force prevents an uncontrolled, typically caused by vibrations, intervention of the two tilting blocks the second recess of the lock washer. Accordingly, the two rocker bars only remain in positive engagement with the lock washer when the keys are removed from the associated locks.

The closing disc can be arranged between two fixed plates oriented perpendicular to the shaft and penetrated by the shaft. In both plates at least four openings may be formed such that when locking in the first active position, a tiltable engagement body of the first tilting bar by a first of the at least four openings and in the second active position a tiltable engagement body of the second tilting bar by a second of the at least four openings respectively is performed with the closing disc to form positive engagement and in the neutral position, a tiltable engagement body of the third tilting bar are guided by a third and a tiltable engagement body of the fourth tilting bar through a fourth of the at least four openings to form positive engagement with the closure disc.

Each of the two plates may have four openings which are arranged mirror-symmetrically on both plates to form four pairs of openings, wherein when locking the engagement body at least one of the four tilting block is guided to form the positive connection with the closure disc through at least one of the four pairs.

At least one of the two plates can be integrated in a U-profile having body having two attached to this plate legs. A rotatably mounted on the operating side portion of at least one of the four rocker arms can be guided by at least one of the two legs and rotatably supported on both legs.

The invention also relates to a high-voltage switchgear with at least one locking device according to one of claims 1 to 12, which system is designed as a generator switch system and can be installed between a generator and a transformer in a multi-phase high-voltage network and on the Transformer side of a load-switching Generatorschalterpols a Trennschalterpol and a grounding switch or which is designed as a generator switch system and can be installed between a generator and a transformer in a multi-phase high-voltage network and on the generator side of a load-switching Generatorschalterpols pole of a start-up switch and a grounding switch.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig.1

eine Einphasendarstellung einer mehrphasigen Hochspannungsschaltanlage nach dem Stand der Technik, welche als mehrphasiges Generatorschaltersystem ausgebildet ist und mehrere Schalterpole aufweist, die in einer Generatorableitung zwischen einem Generator eines Kraftwerks und einem Transformator eines Hochspannungsübertragungsnetzes angeordnet sind,

Fig.2

in perspektivischer Darstellung eine Vorrichtung zur Betätigung einer Kontaktanordnung eines ersten und einer Kontaktanordnung eines zweiten Schaltgeräts des Generatorschaltersystems nach Fig.1, bei dem das erste Schaltgerät geschlossen und das zweite Schaltgerät geöffnet ist,

Fig.3

in perspektivischer Ansicht eine Ausführungsform der Verriegelungsvorrichtung nach der Erfindung, welche in die Betätigungsvorrichtung nach Fig.2 eingebaut ist und welche die beiden Schaltgeräte in einer Neutralstellung verriegelt,

Fig.4

eine von rechts geführte Seitenansicht der Verriegelungsvorrichtung nach Fig.3, bei der ein Mittelteil einer Platte 56 entfernt wurde,

Fig.5

eine Aufsicht auf einen längs V-V geführten Schnitt durch die Verriegelungsvorrichtung nach Fig.4, bei der die Platte 56 wieder vervollständigt wurde,

Fig.6

in vergrösserter Darstellung ein in Fig.3 umrandet dargestellter Teil VI der Verriegelungsvorrichtung,

Fig.7

nach Entfernen eines Nutenrades in perspektivischer Ansicht die Verriegelungsvorrichtung gemäss Fig.3, welche die beiden Schaltgeräte in einer ersten Aktivstellung verriegelt,

Fig.8

die Verriegelungsvorrichtung gemäss Fig.7, welche die beiden Schaltgeräte nun in einer zweiten Aktivstellung verriegelt,

Fig.9

eine in Richtung eines Pfeils IX, X geführte perspektivische Ansicht der Verriegelungsvorrichtung nach Fig.7, bei der der Zugang für die Vorortbetätigung aktiviert und die beiden Schaltgeräte entriegelt sind, und

Fig.10

eine in Richtung des Pfeils IX, X geführte perspektivische Ansicht der Verriegelungsvorrichtung nach Fig.7, bei der der Zugang für die Vorortbetätigung blockiert und der Zugang für die Fernbetätigung aktiviert ist.

With reference to drawings, the invention will be explained in more detail below. Hereby shows:

Fig.1

a single-phase representation of a multi-phase high-voltage switchgear according to the prior art, which is designed as a multi-phase generator switch system and has a plurality of switch poles, which are arranged in a generator lead between a generator of a power plant and a transformer of a high-voltage transmission network,

Fig.2

in a perspective view of a device for actuating a contact arrangement of a first and a contact arrangement of a second switching device of the generator switch system according to Fig.1 in which the first switching device is closed and the second switching device is open,

Figure 3

in perspective view of an embodiment of the locking device according to the invention, which in the actuator according to Fig.2 is installed and which locks the two switching devices in a neutral position,

Figure 4

a guided from the right side view of the locking device according to Figure 3 in which a middle part of a plate 56 has been removed,

Figure 5

a plan view of a longitudinal VV guided section through the locking device according to Figure 4 in which the plate 56 was completed again,

Figure 6

in an enlarged view an in Figure 3 outlined part VI of the locking device,

Figure 7

after removing a Nutenrades in perspective view the locking device according to Figure 3 , which locks the two switching devices in a first active position,

Figure 8

the locking device according to Figure 7 , which now locks the two switching devices in a second active position,

Figure 9

a guided in the direction of an arrow IX, X perspective view of the locking device according to Figure 7 in which the access for the local control is activated and the two switching devices are unlocked, and

Figure 10

a guided in the direction of the arrow IX, X perspective view of the locking device according to Figure 7 in which access for on-the-spot operation is blocked and access for remote control is activated.

WAYS FOR CARRYING OUT THE INVENTION

This in Fig.1 single phase shown multiphase generator switch system shows only one of several largely identically designed switch system poles P, which are aligned parallel to each other and to a horizontally guided axis A. The poles are arranged in a horizontally extended plane and are connected in the course of an axis-aligned generator discharge line GA between a generator G of a power plant and a transformer TR of a high-voltage transmission network. The illustrated pole P is formed in a single-phase encapsulated manner and has an electrically conductive encapsulation K guided to ground E and filled with ambient air. The encapsulation K accommodates a phase conductor L guided parallel to the axis A, in which a switch pole GP of a polyphase generator switch and a switch pole TP of a polyphase disconnector are connected in series. A connection point of the phase conductor L located between a generator-side input of the pole P and the generator switch pole GP is connected to a power connection of a switch pole SP of a multiphase start-up switch whose other Power connection with a arranged outside the enclosure K start-up device, typically for a gas turbine, is connected. The encapsulation takes, among other components, such as overvoltage protection devices and current and voltage converter, two grounding ES1 and ES2, of which one, namely ES1, a generator-side power connector and the other, namely ES2, a transformer-side power connector of the system pole P when closing electrically conductive with the encapsulation K and thus also connects to earth E. A switch system provided on the generator side of the load-switching switch pole GP has the switch pole SP of the multi-phase start switch and the ground switch ES1, whereas a switch system provided on the transformer side has the switch pole TP of the multiphase disconnector and the ground switch ES2.

Each of the two switch systems has a device for actuating a contact arrangement of the switch pole SP resp. TP and the associated grounding switch ES1 resp. ES2 up. One of these two devices will be discussed below for the switch system including the two switches TP and ES2. A similarly constructed second of these two devices is suitable to actuate the contact arrangements of the switch pole SP and the grounding switch ES1 analog. The actuator allows only a neutral position and two active positions. In the neutral position, both switches are opened, whereas in a first of the two active positions of the earthing switch ES1 resp. ES2 closed and the switch SP resp. TP is open and in the second active position of the earthing switch ES1 resp. ES2 open and the switch pole SP resp. TP is closed. In any case, the actuating device is designed so that a simultaneous closure of the two switches SP and ES1 resp. TP and ES2 is excluded.

Out Fig. 2 It can be seen that this device has a rotatable about an axis A drive shaft 10 to which an angle lever with two a base angle α including lever arms 12 and 13 is attached. The shaft 10 transmits force via a lever arm 12 containing lever mechanism 20 to a contact arrangement of the switch pole TP respectively. via a lever arm 13 containing the lever mechanism 30 to a contact arrangement of the grounding switch ES2.

The shaft 10 is coupled to a stepper gear 40 designed as a Maltese cross gear. The Maltese Cross Gear has one of a drive 41 in the clockwise or counterclockwise rotatable drive pulley 42 with a crank pin 45 and a tie 46 and a seated on the shaft 10 Nutenrad 43 with the tie 46 matching, from Figure 3 apparent recesses 461, 462 and 463.

The Figure 3 shows that in the Nutenrad 43 two radially aligned grooves 441, 442 are formed, which are arranged rotated by the predetermined base angle α in the circumferential direction of the primary shaft 10 against each other. The base angle is typically between 70 and 110 °. In one Figure 3 apparent position of the Nutenrads 43 is the Maltese cross gear in the neutral position in which the two switching devices TP and ES2 are open. The crank pin 45 of the drive pulley 42 is then located outside the two grooves 441, 442. The resting on the tie 46 recess 461 secures the neutral position against inadvertent rotation of the shaft 10. When turning the drive pulley 42 in the clockwise direction of the crank pin 45 engages in the groove 441, so that the Nutenrad 43 and thus also the drive shaft 10 to the base angle α rotate counterclockwise. It is thus achieved the first active position, in which a first of the two switching devices closed, the second, however, is open. In the first active position, the recess 462 rests on the retaining bow 46 and thus secures this position against rotation of the primary shaft. The same applies when turning the drive pulley 42 in the counterclockwise direction. The crank pin 45 engages in the groove 442, so that the Nutenrad 43 and thus the drive shaft 10 rotates clockwise about the base angle. It is thus achieved the second active position in which the second switching device is closed, the first, however, is open. In the second active position, the recess 463 rests on the retaining bow 46 and thus secures this position against rotation of the drive shaft 10.

The actuating device described above is generally actuated by a remote control room and therefore has an electrical connection to the control room suitable for the transmission of power and electrical signals. This connection is used primarily for the transmission of power to operate the electric motors for opening and closing the contact arrangements of the two switching devices and the transmission of status, measurement and Control signals. The force required in such a remote operation is like Fig.2 can be seen from the drive 41 via a worm gear to the drive wheel 42 of the Maltese cross transmission 40 transmitted.

If necessary, the power can also be transferred on site with a hand crank 47 on the actuator. Depending on the direction of rotation of the hand crank so suburb the two switching devices are brought into the neutral position or in one of the two active positions.

In order to avoid damage to the manual operation suburb in the switchgear, is in the actuator one from the FIGS. 3 to 10 apparent locking device integrated. As in the FIGS. 3, 4 7-10, the locking device includes a rocker bar assembly 50 including 4 tilting bars 51, 52, 53, 54, each having a rotatably mounted portion 500 and an engagement body 501 attached to that portion, cooperating with the rocker latch assembly and on the drive shaft 10 fastened lock washer 60, arranged on a housing wall operating side 70 and one only from the FIGS. 4 . 9 and 10 apparent slide 80.

As in Figure 4 shown, the slider 80 is rotatably supported in a guided from the operating side 70 through the housing wall lock 75 in the interior of the locking device and can - as in the FIGS. 9 and 10 shown - occupy two positions. These two locations can suburb by plugging one out Figure 4 apparent key 700 in a run through the operating page 70 lock 75 and turning the key can be achieved.

In Figure 9 the slider 80 is in a first of the two positions. In this position the access for the local control is enabled and the access for the remote control is blocked. Trained, authorized personnel can therefore in this position of the slide 80 with the help of Fig.2 Manual crank 47 manually set the first active position, the second active position or the neutral position of the two switching devices and lock each of the three positions with the tilting mirror device 50 and the locking disc 60. In this case, the rocker bar 51 engages in the first active position and the rocker bar 52 in the second active position in the lock washer 60 and engage in the neutral position, the rocker bar 53 and 54 in the lock washer 60 a. Is the deducted key 75 in the possession of a person in the potential danger area, it is ensured that the local control can not be reset by a third party to remote control.

In Figure 10 the slider 80 is in a second position in which the access for the on-site operation is blocked and the access for the remote control is released, the sub-key 75 for the slider stuck in this position and can not be deducted. The slide 80 blocks the two rocker bars 51 and 52, by forming a positive locking with a retaining bow 81 into a circular disk 511 provided with an edge recess, respectively. 521 of the rocker bar 51 respectively. 52 engages, thereby avoiding unwanted manual operation of the two switching devices in remote operation.

In the out Figure 9 apparent first position lift two edge recesses 82, 83 in the tie 81 the positive connection and thus the blocking of the two tilting bow 51, 52. After removing the key from the lock 75, the slider 10 is blocked in the first or second position.

The slider 80 further includes an arm 84 which extends in his Figure 10 apparent second position, a switching element 85 which turns on and off a through an opening 76 (FIG. Figure 9 ) Power supply for remote operation of the system is used.

As Fig. 3 can be removed, the four tilting bars 51, 52, 53 and 54 are each rotatably mounted in one of four guided through the housing wall on the operating side 70 locks 71, 72, 73, 74. Each of the four rocker bars can by turning a key inserted into the associated lock, for example 71, 700 in a closed position in which the rocker bar, here 51, engages with its engagement body 501 to form a positive fit in the washer 60, and by opposing turning in an open position in which the rocker bar, here 51, out of engagement with the locking disk 60, are performed. After removing the key 700 from the lock, here lock 71, the associated tilting bar, here tilting bar 51, is blocked in the closed or open position.

The particular off Figure 4 apparent locking disk 60 has two recesses 61 and 62. In the recess 61 engages when locking the access for manual operation of the switching devices in the first active position of the tilting pad 51 and in the second active position of the tilting block 52 to form positive engagement with the lock washer 60 a. When locking the access for the manual operation of the switching devices in the neutral position, however, the two rocker arms 53 or 54 can engage with the lock washer 60 in the recess 62, regardless of the operating position of the key 73 and 74.

In Figure 3 It is shown that the closing disc 60 between two perpendicular to the shaft 10 aligned and penetrated by the shaft, fixed plates 55, 56 is arranged. In the plate 55 four openings 551 are formed, in the plate 56 four of the FIGS. 7 and 8 apparent openings 561. The openings 551 and 561 are mirror-symmetrically opposed to each other and thus form four pairs of openings through which engagement body 501 of one of the rocker bar is feasible.

As can be seen, each of the two plates 55 resp. 56 integrated in a U-profile body, the two to the plate 55, respectively. 56 attached legs 552 resp. 562 has. The rotatably mounted on the operating side 70 portion 500 of the two tilting bow 51 and 52 resp. 53 and 54 is at least one of the two legs 552 resp. 562 out and rotatably mounted on both legs.

The two rocker arms 53 respectively. 54 are biased against their direction of rotation of the open in the closed position with a biasing force, which is applied by two torsion springs 531 and 541. Figure 6 shows that to achieve the bias one end of the torsion spring 541 is fixedly held on the leg 552 and the other end on the tilting bar 54. The biasing force therefore prevents an uncontrolled, caused for instance by vibration engagement of the two tilting bars 53 and 54 in the recess 62 of the locking disc 60. Therefore, the tilting pad 53 and 54 remain only in positive engagement with the locking disc when the keys 700 of the associated locks 73 and 74 are deducted.

• In dem in Fig.3 dargestellten Betriebszustand blockiert die Verriegelungsvorrichtung in der Neutralstellung der beiden Schaltgeräte, beispielsweise TP und ES2, den Zugang für das Betätigen der beiden Schaltgeräte. Der Schieber befindet sich in der aus Fig.9 ersichtlichen ersten Position, in der der Schieber 80 den Zugang für die Fernbetätigung durch Öffnen des Schaltelements 85, d.h. durch Unterbrechen der Stromverbindung zur Schaltwarte, blockiert hat und die beiden Kippriegel 53 und 54 durch Eingriff in die Aussparung 62 den Zugang zur manuellen Betätigung der beiden Schaltgeräte TP und ES2 blockieren.

The operation of this locking device is as follows:

• In the in Figure 3 shown operating state blocks the locking device in the neutral position of the two switching devices, such as TP and ES2, the access for the operation of the two switching devices. The slider is in the off Figure 9 apparent first position in which the slider 80 access for the remote operation by opening the switching element 85, ie by interrupting the Power connection to the control room, has blocked and block the two rockers 53 and 54 by engaging in the recess 62 access to the manual operation of the two switching devices TP and ES2.

As Figure 5 can be removed, the two engagement body of the tilting bow 53 and 54 then form not only a positive connection with the locking disc 60, but also with the plates 55 and 56, since they are each penetrated into an opening pair, each one of the four openings 551 and a the four opposite opening 562 contains. Optionally transmitted from the shaft 10 via the closing disc 10 on the rocker arms forces are substantially reduced by this positive engagement.

If the switchgear of the in Figure 3 illustrated neutral position in the off Figure 7 can be brought apparent first active position, so first the two rocker bars 53 and 54 are pivoted by turning the key in the two locks 73 and 74 and so lifted the positive connection with the locking disk 60. With the help of Fig.2 apparent hand crank 47, the shaft 10 is now rotated by the base angle, here 90 °, and so the first active position is reached. By pivoting the rocker bar 51 in the lock 71 by means of the key is a positive engagement of the rocker bar 51 in the off Figure 4 reached apparent recess 61 and thus locked after reaching the first active position of access for the actuation of the two switching devices.

If the switchgear manually from the first active position in the off Figure 8 apparent second active position are brought, so first the tilting block 51 is pivoted by turning the key in the lock 71 and so lifted the positive connection with the locking disc 60. With the help of Fig.2 apparent hand crank 47, the shaft 10 is now rotated by twice the base angle, here -180 °, in opposite directions, thus reaching the second active position. By pivoting the rocker bar 52 in the lock 72 is a positive engagement of the rocker bar 52 in the off Figure 4 apparent recess 61 and thus blocked in the second active position access for the actuation of the two switching devices.

Should be based on from the FIGS. 3 to 5 apparent neutral position of the two switching devices, the switchgear are actuated again from the control room, so by key-secured pivoting of the two rocker arms 53 and 54 of the positive connection with the locking disc 60 is repealed. Now none of the four Flip-flop 51 to 54 forms a positive connection with the locking disc, by key-secured rotation of the slide 80 from the Figure 10 apparent position can be achieved.

The locking device according to the invention is not limited to an encapsulated generator switch system which can be installed between a generator of a power plant and a transformer of a high voltage network, it can also be used in another switch system, for example a gas-insulated metal-enclosed high-voltage switchgear.

LIST OF REFERENCE NUMBERS

A

axis

e

earth

ES1, ES2

earthing switch

G

generator

GA

generator output

GP

breaker

K

encapsulation

L

phase conductor

P

Schaltersystempol

SP

Switch pole of a start-up switch

TP

Switch pole of a circuit breaker

TR

transformer

α

base angle

10

drive shaft

11

bell crank

12, 13

lever arms

20, 30

lever mechanism

40

step gear

41

drive

42

drive Windscreen

43

grooved wheel

441, 442

groove

45

crank pin

46

tie

461, 462, 463

recesses

50

flip latch

51, 52, 53, 54

rocker

55, 56

plates

500

rotatable sections of the rocker bars,

501

Engagement body of the tilting bar

511, 521

Circular disks of the rocker bars

531, 541

torsion

551, 561

openings

552, 562

leg

60

Schliessscheibe

61, 62

Recesses of the closing disc

70

operating side

71, 72, 73, 74, 75

Castles

76

opening

700

key

80

pusher

81

Tie of the slider

82, 83

Edge recesses of the tie

84

poor

85

switching element

Claims (14)

1. Device for locking an access for actuating two switching devices (ES1, ES2, S, TP) of high-voltage switchgear with the aid of a drive shaft (10) transmitting drive force onto the two switching devices, said drive shaft being rotated, in a first active position of the two switching devices, in the clockwise direction through a base angle (α) and, in a second active position of the two switching devices, being rotated in the counterclockwise direction through the base angle relative to its angle position in a neutral position of the two switching devices, characterized in that
   the locking device comprises a closing disk (60) which is fastened on the drive shaft (10), a rocker bar arrangement (50) containing at least four rocker bars (51, 52, 53, 54), and a slider (80),
   wherein the slider (80) can be moved, on-site, into two positions, the first of which releases an access for the actuation on-site and blocks an access for the actuation from a remote location, and the second of which blocks the access for the on-site actuation and releases the access for the remote actuation,
   wherein, in the first position of the slider (80), a first rocker bar (51) can engage into the closing disk (60), in the first active position, and a second rocker bar (52) can engage into said closing disk, in the second active position and, in the neutral position, a third rocker bar (53) and a fourth rocker bar (54) can engage into the closing disk (60), and
   wherein the slider (80), in its second position, blocks the first rocker bar (51) and the second rocker bar (52).
2. Device according to Claim 1, characterized in that the slider (80) and the four rocker bars (51, 52, 53, 54) are each rotatably supported in one of five locks (71, 72, 73, 74, 75) inserted through a housing wall on an operating side (70) of the locking device.
3. Device according to Claim 2, characterized in that the slider (80) can be moved from the first position into the second position by turning a key (700) inserted into the associated lock (75) and, by rotating the key in the opposite direction, said slider can be moved from the second position into the first position, and in that the slider (80) is blocked in the first or second position after the key (700) has been withdrawn.
4. Device according to one of Claims 2 or 3, characterized in that each of the four rocker bars (51, 52, 53, 54) can be moved, by turning a key (700) inserted into the associated lock (71, 72, 73, 74), into a closed position, in which the rocker bar engages into the closing disk (60), forming a form-locked connection, and, by turning said key in the opposite direction, into an open position, in which the rocker bar is disengaged from the closing disk, and in that each of the four rocker bars is blocked in the closed position after the key is withdrawn.
5. Device according to one of Claims 2 to 4, characterized in that, on the side of the housing wall facing away from the operating side (70), the slider (80) includes a holding arc (81) having two marginal cut-outs (82, 83), and the first rocker bar (51) and the second rocker bar (52) have a first circular disk (511) and a second circular disk (521), respectively, each of which is provided with a marginal cut-out,
   wherein, in the second position of the slider (80), the holding arc (81) has been inserted into the marginal cut-out of the first circular disk (511) and into the marginal cut-out of the second circular disk (521), forming a form-locked connection, and
   wherein, in the first position of the slider (80), the two marginal cut-outs (82, 83) of the holding arc (81) release a blocking of the first rocker bar (51) and of the second rocker bar (52).
6. Device according to one of Claims 1 to 5, characterized in that the slider (80) includes an arm (84) which, in the second position of the slider, switches a switching element (85) on, the switching element being used for switching a power supply on and off, which is used for the remote-controlled actuation of the switchgear.
7. Device according to one of Claims 1 to 6, characterized in that the closing disk (60) has cut-outs (61, 62), and in that, during locking, the first rocker bar (51) engages into a first cut-out (61) of the cut-outs in the first active position and, in the second active position, the second rocker bar (52) engages into a first cut-out (61) of the cut-outs, forming a form-locked connection, and, in the neutral position, the third rocker bar (53) and the fourth rocker bar (54) engage into a second cut-out (62) of these cut-outs.
8. Device according to one of Claims 4 to 7, characterized in that the third rocker bar (53) and the fourth rocker bar (54) are acted upon by a preload counter to their direction of rotation from the open position into the closed position.
9. Device according to Claim 8, characterized in that the preload is applied by two torsion springs (531, 541), wherein one end of at least one torsion spring (541) of the two torsion springs is fixed and the other end is held on one (54) of the two rocker bars (53, 54).
10. Device according to one of Claims 1 to 9, characterized in that the closing disk (60) is situated between two fixed plates (55, 56) which are oriented perpendicular to the drive shaft (10) and through which the shaft extends, and
    at least four openings (551, 561) are formed in the two plates (55, 56) in such a way that, during locking, in the first active position, a rockable engagement body (501) of the first rocker bar (51) is inserted through a first opening (561) of the at least four openings and, in the second active position, a rockable engagement body (501) of the second rocker bar (52) is inserted through a second opening (561) of the at least four openings, forming a form-locked connection with the closing disk (60) in each case, and, in the neutral position, a rockable engagement body (501) of the third rocker bar (53) is inserted through a third opening (551) and a rockable engagement body (501) of the fourth rocker bar (54) is inserted through a fourth opening (561) of the at least four openings, forming a form-locked connection with the closing disk (60).
11. Device according to Claim 10, characterized in that each plate (55, 56) has four openings (551, 561) which are mirror-symmetrically disposed on both plates, forming four pairs of openings, wherein, during locking, the engagement body (501) of at least one of the four rocker bars (51, 52, 53, 54) is inserted through at least one of the four pairs, forming the form-locked connection with the closing disk (60).
12. Device according to one of Claims 10 or 11, characterized in that at least one of the two plates (55, 56) is integrated into a main body which has a U-shaped profile and has two limbs (552, 562) attached to this plate, and in that a section (500) of at least one of the four rocker bars (51, 52, 53, 54), which is rotatably supported on the operating side (70), is inserted through at least one of the two limbs and is rotatably supported on both limbs.
13. High-voltage switchgear comprising at least one locking device according to one of Claims 1 to 12, which switchgear is designed as a generator circuit-breaker system and can be installed in a multi-phase high-voltage network, between a generator (G) and a transformer (TR), and comprising a disconnect-switch pole (TP) and a grounding switch (ES2) on the transformer side of a load-switching generator circuit-breaker pole (GP).
14. High-voltage switchgear comprising at least one locking device according to one of Claims 1 to 12, which switchgear is designed as a generator circuit-breaker system and can be installed in a multi-phase high-voltage network, between a generator (G) and a transformer (TR), and comprising a pole of a start-up switch (SP) and a grounding switch (ES1) on the generator side of a load-switching generator circuit-breaker pole (GP).

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