DE3020800A1 - Quick release for vacuum circuit breaker - has low inertia mechanism mounted directly on live pole - Google Patents

Abstract

The trip mechanism for a vacuum circuit breaker enables a quick normal tripping action as well as a quick trip immediately following circuit breaker closure. The latter condition is representative of closing the breaker onto a fault. The increase in speed is achieved by reducing the mass, and hence the inertia, of the release mechanism. The desired reduction in mass is achieved by mounting the release mechanism directly on one pole of the circuit breaker, at high potential. A lever operated by a boss on the contact operating bolt sets the latch when the circuit breaker is closed. At the same time the connected rod and spring system engages the lock which holds the contacts closed. To initiate a trip the latch is released. The springs rapidly move the light rod such that the attached lever turns the bolt to the free position allowing the trip springs to part the contacts.

Description

Vacuum circuit breaker

The invention relates to a vacuum circuit breaker according to the preamble of claim 1.

Such a switch is based on the German utility model 7 936 232 as known.

The object of the invention is to reduce the tripping time of the switch, i.e. the time from the arrival of the off signal to the disconnection of the switching contacts passes, as does the switching time, this is the time that the switch after a A switch-on that has just been carried out is required to switch it off again (e.g. when switching on to a short circuit).

One difficulty arises from the fact that the mass of the mechanical Do not reduce the size of unlocking or locking elements arbitrarily for rapid movement sequences leaves; because high breaking capacities strong fraftipe-proof with appropriately dimensioned Condition locking links.

For switches of the German utility model 7 936 232 it is e.g. not possible to achieve a desired short switchover time, since the one there is on the switch-off force store Acting shift lever of the drive first must be completely swiveled back into its starting position before the switch-off movement of the contact is enforceable.

The solution to the problem posed at the beginning is achieved by using a high-voltage potential arranged coupling between drive and switch-off force accumulator achieved which the operative connection of these parts at the end of the switch-on movement of a shift lever - after the switch-on has been completed and the switch-off force store is locked -, inevitably unmittelbar cancels and that the trigger linkage one, too Contains energy storage device arranged at switch pole on liochspannungspotential.

The coupling is expediently realized by a ratchet system. This can be carried out nassearn, since after the locking of the switch-off force accumulator only the low force of its release spring is to be released.

The release linkage can also be achieved by the arrangement according to the invention its energy storage system should be carried out nassearn, because it then only needs for a draw to transfer tensile forces.

The design of the coupling can be such that the pivotable by the drive, at the switch pole mounted switch lever at its free end rotatably a locking lever contributes to the power transmission, which runs up to a stop when switched on, whereby he - releasing the clutch - swings out Swivel levers act on the switch-off force accumulator, in which case the single, releasable Coupling is formed between these levers.

Further explanations of the invention following a description of an exemplary embodiment be entno en.

Fig. T shows the side view of a switch pole with a vacuum interrupter (1) when switched off. The stationary contact is shown in dashed lines (2) and the movable contact (3). The interrupter 1 is held by the lower ones Connection piece (4) which is attached to the right side of the rib support (5). That The conductor element (6), which is led out of the switching tube 1 at the top, protrudes into the upper connection piece (7) which again attached to the right side of the rib support (8) is. Both rib supports are mounted together on the base frame (9).

The connection piece 7 goes up into the switch housing (10), in which the switch-off force accumulator as well as the

Release mechanism is housed.

In Fig. 2, the switch housing 10 is shown in axial section.

The upper part of the vacuum interrupter 1 with the conductor element can be seen 6, which merges into the threaded connector (ti) and onto which the contact tube (12) is screwed is.

The latter contains the lamellar contacts (13) in corresponding grooves. These become on the inner wall of the cylindrical part during the logging operations of the switch housing 10 shifted axially.

The threaded piece (1i) is attached to the threaded connector 11, this is surrounded by the screw sleeve (15) into which the bolt (16) is firmly screwed at the top is. The bolt 16 is thus connected to the movable contact 3 in a force-locking manner.

The bolt head (1 is embedded in the guide piece (18).

The latter serves as the upper abutment for the switch-off spring (19) and the contact compression spring (20). The opening spring 19 rests on the bottom Fixed approach (21) in switch housing 10 and the contact pressure spring 20 on the Screw sleeve 15 off.

The ball guide piece (22) is arranged above the guide piece 18, that is therefore under the pretensioning pressure of the said springs against the limiting end face of the switch housing 10 is pressed.

The balls (23) are in the bores of this ball guide piece. stored, which is held in the radial direction outside by the stationary support tube (24) and partially engage inwardly in that of the plunger (25).

The plunger 25 contains the release spring (26), which is down on the Bolts of the ball guide piece 22 is supported. The plunger 25 protrudes with a square shoulder from the switch housing 10.

The latter has a bearing for the bolt (27) on which the pivot lever (28) rotatesF ~ is arranged. On the bolt 27 is also rotatable the shift lever (31) mounted. It has a bearing point at its free end for the bolt (29) on which the locking lever (30) is rotatably arranged.

The switch is in the off state. Becomes one Switching on the switching lever 31 pivoted by the drive in the direction of the arrow to the left, then the free end of the locking lever 30 presses the free end of the pivot lever 28 frictionally downwards. The latter presses the plunger 25 over its end face downward.

Since the balls 23 cannot move laterally, they form one Frictional connection from the plunger 25 to the ball guide piece 22, which is thus also after is pushed down. This movement inevitably follows the guide piece 18, the on the biased contact compression spring 20, the screw sleeve 15, the thread piece 14 and the attached conductor element 6 with the movable contact 3 downward presses until the latter comes to a standstill after contact has been made with the stationary contact 2 comes.

By further downward movement of the plunger 25, the preloaded is now Contact compression spring 20 continues to be tensioned up to full contact pressure.

During this movement process is also from the guide piece 18 the pretensioned switch-off spring 19 is tensioned.

After by the downward movement of the said parts the contact pressure was achieved, the balls 23 are now in front of a recess in the stationary Support tube 2i arrives, so that the radial outer support is canceled.

The bearing surface of the balls 23 in the groove of the plunger 25 has a slope, so that now the balls by a radial force component in the called recess are pressed. Here, the frictional connection of the plunger 25 lifted for ball guide piece 22, the plunger can now move freely downwards and thereby tensions the already tensioned release spring 26. With its outer circumferential surface he blocks the balls 23.

During this downward movement of the plunger 25, one arrives at its square provided recess in front of the lower edge of the half-wave (31a), so that the latter by means of a spring itself able to turn around a small angle and thus locks the plunger against upward movement.

After another downward stroke of the plunger, the nose hits (32) of the latch lever 30 on the stop (33), which is from the head of a fixed adjusting screw is formed. By pivoting the locking lever 30, the latch is between him and the pivot lever 28 released. The latter is on the one hand by the return of the overstroke of the shock 25, caused by the release spring 26, and to other possibly its own return spring snapped freely into its starting position until it with its rear lever end (34) ar stationary switch housing 10 strikes. The switch-on operation is now completely completed and the system is in the position shown in Fig. 3 arrives.

Although the shift lever 31 is still in the switching position, its frictional connection to the plunger 25 is canceled so that it is ready to be switched off directly is. In view of the requirement of a very short non-switching period, this fact is essential, because the backward movement of the switching lever 31 over the insulating rod, Shift shaft, etc. not shown3 is due to the mass density of these components severely delayed.

The following switch-off process is initiated by turning the half-wave 31a in the direction of the arrow (Fig. 3). The release spring 26 relax and push the plunger 25 upwards until its groove is in front of the balls 23 konmtw The bearing surface of the balls 23 in the recess of the stationary support tube 24 also has a slope, so that under the force directed upwards the tensioned contact pressure spring 20 and switch-off spring 19 are directed inwards radial force components these balls 23 in di. The groove of the plunger 25 presses. In order to the frictional connection of the moving parts to the stationary Stiltzrohr 24 is lifted Vi. can be seen, the Iopf 17 of the bolt 16 has when the contact pressure spring is tensioned 20 released from its support in guide piece 18 by a certain amount. Around This amount can be the contact pressure spring 20 and the opening spring 19, before movable contact 3 released, free relax. Through the through conditional impact of the guide piece 18 on the head 17 creates a pulse that possibly occurring welds of the contacts tear open.

Now the relaxing opening spring 19 pushes the movable one System upwards and thus executes the switch-off movement.

Then the switching lever 31 and thus the locking lever 30 brought back into the starting position shown in FIG. 2 by the drive.

With the invention it is possible to measure the time from the release of the half-wave 31a to reduce significantly up to the contact separation. To make the total tripping time small It makes sense, though, to keep the components that make the rotation of the half-wave 31a, are kept small in terms of mass, i. E.

consequently that they are largely also arranged on the switch pole are. For the sake of clarity, these are shown semi-schematically in FIG. By doing The head 17 of the bolt 16 protrudes sideways from the switch housing 10 Bolt (36) mounted; it is thus frictionally connected to the movement of the movable one Contact 3 bound. It engages positively in the fork of the lever (37), the is mounted on the bolt (38). The latter is in a corresponding hole out in the switch housing 10. The lever 37 thus leads exactly to the switching movement connected pivoting, which via the insulating rod (39) to the earth-side Switch position display are forwarded.

At the free end of the lever 37 is over the rotatable guide piece (40) the rod (41) which can be displaced therein and forms the release linkage is supported. This guide piece 40 is located in a radius-compensating fork.

The adjusting rings (42), (43) and (44) are attached to this rod 41. Furthermore, the rod 41 is slidably and rotatably mounted in the guide piece (45), which is arranged at the free end of the lever (46) on the one from the switch housing 10 laterally led out end of the half-shaft 31a is attached. From the drawn The switch-off position can be seen in the constellation.

The rod 41 is on the earth side with a locking member via a thin insulating rod (47) currently connected in locked position.

Between the adjusting ring 44 and the guide piece 45 is on the rod 41 arranged the currently tensioned compression spring (48). If the switch is turned on, then this compression spring 48 presses the half-shaft into the blocking position via the lever 46. The guide piece 45 thus comes directly next to the adjusting ring 43.

When switching on, the bolt 36 is down and thus the guide piece 40 moved to the left. Here, the latter tensions the between him and the collar 43 on the rod 41 mounted compression spring (49). Is on the earth-side locking member a pulling force exerted.

If the locking member 47 is now released for disconnection, then the tensioned compression spring 49 presses the rod 41 to the left via the adjusting ring 43, while the adjusting ring 43 presses the guide piece 45 and located next to it so that the lever 46 to the left, so that the half-shaft 31a releases the latch and the switch-off takes place. The moving parts of this system are of low mass.

With the leftward movement of the rod 41, the adjusting ring also moves 44 to the left, accordingly, the relaxed compression spring 48 continues the pivoting movement of the Lever 46 does not offer any resistance. The switch-off movement of the bolt swivels now the guide piece 40 to the right; this presses the adjusting ring 42 Rod 41 to the right again. So that the spring 48 is again for a switch-on process tensioned, and the locking member 47 is in reverse voltage.

In this unusually simple way, after every switching operation, prepared the following switching action, i.e. the usual quick reactions for Switching processes, with individual components being different during a switching process perform directed movements are not necessary; a circumstance that increases significantly contributes to operational safety.

Claims (5)

Claims 0 vacuum circuit breaker for high voltage with along one Axis relatively movable contacts and at the switch pole on high voltage arranged, when switched on by a drive chargeable switch-off force storage as well as facilities for its supply or Unlocking, the unlocking actuation via a release linkage takes place, characterized by a coupling arranged at high voltage potential between drive and switch-off force storage, which is the operative connection of these parts at the end of the switch-on movement of a switching lever (31) - after the switch-on completed and the switch-off force accumulator is loaded and locked - inevitably and immediately removes and that the release linkage (rod 41) is an energy storage device contains, which is also arranged at the switch pole on high voltage potential. 2.) Switch according to claim 1, characterized in that the free End of the switch lever (31), which can be pivoted by the drive and mounted on the switch pole a rotatable locking lever (30) for power transmission, which when switched on runs onto a stop (33), whereby it - releasing the coupling - swung out will. 3.) Switch according to claim 2, characterized in that the locking lever (30) acts via a pivot lever (28) on the switch-off force accumulator and this Parts form the reversible coupling. 4.) Switch according to claim 3, characterized in that the pivot lever (28) and locking lever (30) each have a corresponding concave or convex sliding surface have and the pivot lever by a return spring in its starting position can be brought. 5.) Switch according to claim 1, characterized in that the force storage of the release linkage by two acting in the axial direction of this linkage Springs (48, 49) is formed, in direct dependence on the position of the movable contact (3) each have a spring for actuating the unlocking or locking of the switch-off force accumulator is tensioned.