SU1370679A1 - Current-limiting device for circuit-breakers - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to improve the reliability of the operation of the device with self-return contacts. The device differs from the prototype by the presence of a retarder of the contact system, which contains a spring-loaded cracker (PS) 44 located in the insulating sheath 2. PS 44 has an opening 45 in which

Description

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ABOUT)

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One end of the spring-loaded lever (PR) 48. The second end of the PR 48 with plane 54 and protrusion (B) 55 interacts with B 41 located on the outer side surface of the cup 20, on which the spring-loaded rotary contact bridge (KM) 5 is located. PS 44 can rotate Bojcpyr axis 52 and move relative to this axis along axis 53. When a short-circuit current appears under the action of electrodynamic forces, contact bridge 5 is rejected, while B 41 acts on PR 48 and moves it along axis 53 to a position that does not hinder movement contacts. When the contacts move in the direction of the closure, the B 41 engages with the B 55, the PR 48 rotates and moves the PS 44. Due to the mass of the PS 44 and the opposing force of its spring 46, the movement of the contacts in the direction of the closure occurs. 1 z.p, f-ly, 6 ill.

. one

The invention relates to electrical engineering, namely to current-limiting devices connected in series with automatic switches providing protection of circuits against short-circuit currents.

The purpose of the invention is to increase the reliability of the device with self-return contacts.

FIG. 1 shows the current limiting device, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. 4 shows a retarder when the contact system moves in the direction of opening, in FIG. 5 - the same, in the direction of closure - in FIG. 6 shows an embodiment of a current-limiting device with two springs.

The device contains a composite insulating shell consisting of a housing 1, a front cover 2, a front additional cover Z. and a rear cover 4. Inside the insulating shell are a movable contact bridge 5 with movable contacts 6 and 7. U-shaped tires 8 and 9 with fixed contacts 10 and 11, the continuations of which on one side form arcing horns 12 and 13, and on the other side clamps 14 and 15 for connecting external conductors, with movable contacts 6 and 7 forming an electrical connection with fixed contacts-10 and 11 corresponds In fact, arcing systems 16 and 17, in which arcing horns 12 and 13, respectively, are inserted. Contact

the bridge 5 is located with the possibility of movement in the grooves 18 and 19 of the front cover 2 and with the possibility of limited rotation relative to the cup 20 around the axis 21 located in the projections 22 made at the bottom of the stack — 20 outside, and spring-loaded 23, which one end rests against the front additional rim 3, and the second end is inserted into the glass 20, which can be moved in the opening 24 of the front rim 2.

Inside the U-shaped tires 8 and 9 are located ferromagnetic H-shaped parts 25 and 26, which are isolated from the U-shaped tires 8 and 9 with gaskets 27, 28 and 29, 30, respectively. In the immediate vicinity of the N-shaped parts 25 and 26 from the side opposite to the installation of the fixed contacts 10 and 11, are installed in the housing 1 can be rotated, for example, around the axes 31 and 32, ferromagnetic parts 33 and 34, spring-loaded springs 35 and 36 to the side back cover 4.

thirty

The housing 1 has a hole 37 in which is movably located, spring-loaded by a spring 38 in the direction of the protrusion 39, which is, for example, part of the rear bolt 4, pin 40, which can be interconnected with a 35-action contact bridge 5 and ferromagnetic details 33 and 34.

On the outer side surface of the glass 20 is made the protrusion 41 (figure 2),

In the hole 42 (Figs. 3-5), the front collar 2 is mounted with the movement of a cracker 44 with a hole 45 and spring loaded 46 along its longitudinal axis 43. In the groove 47 of the front cover 2 and the cracker 44 hole 44, one end houses the lever 48, the second an end in the groove 49 of the front cover 2, spring-loaded with a spring 50 located in the groove 47 in the direction of the protrusion 41 with the possibility of longitudinal movement and rotation, containing a longitudinal groove 51 with an axle 52 located therein fixed in the front cover 2. Longitudinal axis 53 of the longitudinal groove 51 points to the side the protrusion 41 and perpendicular to the surface 54 of the second end of the lever

48. The protrusion 55, which is part of the WTO-2o stupid 55 lever 48 and in the area of such a second end of the lever 48, is located in such a way that it can interact with the protrusion 41. This node is a retarding motion of the contact system towards the closure.

The contact pressing assembly (Fig. 6) consists of two springs 56, angled to the contact bridge 5 and to each other, each of which is located with end surfaces on the earrings 57 and 58, one of the earrings, for example 57, rotatably on axis 59, short circuits, when contacts under the action of electrodynamic forces are rejected for short distances, insufficient for engaging the protrusion 41 with the protrusion 55 of the lever 48. To prevent re-closure of the contacts without slowing down the setpoint ferromagnetic parts 33 and 34 (Fig. 1) is selected

30 is somewhat lower, for example, by selecting the appropriate springs 35 and 36, than the response setting of the contact bridge 5.

FIG. 4 shows the retarder at

Replaced in the front cover 2, and in the movement of the contact system towards

An earring, for example, 58 is rotatably mounted on an axis 60 fixed in glass 20.

The device may comprise a buffer unit consisting of a damper 61 located in the opening 62 of the front cover 2 and spring-loaded 63 towards the stop 64, which is, for example, part of the front cover 2.

To increase electrical insulation 1, the end 65 of the pin 40, with which the ferromagnetic parts 33 and 34 come into contact, may be made of an insulating material. In the front of the counter 2 (Fig. 3) to allow the Assembly of the assembly can be made a hole closed by a plug 66.

The device works as follows.

In the event of a toka.ko- {joTKoro circuit in the circuit under the action of electrodynamic forces, reinforced by 40

open

When the contact bridge 5 moves towards the open side (along the arrow), the protrusion 41 acts on the surface 54 of the lever 48 and moves the lever 48 along the longitudinal axis 53 to a position that does not impede the movement of the contact bridge 5 towards the contact opening, At the subsequent moment the lever g 48 under the action of the spring 50 returns to its original position.

FIG. 5 shows the retarder when the contact system moves in the direction of the closure.

After decreasing the current to values below the device setpoint for current or disconnecting the current, the contact bridge 5 moves in the direction of the closing (in the direction of the arrow), the protrusion 41 engages with the protrusion 55 of the lever 48 and further the lever 48 rotates around its axis 52, while moves the part 44 along the longitudinal axis 43. Due to the mass of the part 44 and about 50

55

When ferromagnetic elements are formed, the movable contact bridge 5 is thrown away and electric arcs are introduced between the opening contacts 6 and 7, 10 and 11, respectively, providing current limiting.

When the flow of short circuit current ferromagnetic parts 33 and

34, under the influence of electromagnetic forces, are attracted to the H-shaped parts 25 and 26, respectively, and act on the pin 40, which, in turn, additionally pushes the contact bridge 5 towards the opening of the contacts. The presence of such a mechanism ensures that the contact bridge 5 is retracted to a distance sufficient to engage the protrusion 41 (Fig. 3) from short circuits, when the contacts under the action of electrodynamic forces are rejected for short distances insufficiently to engage the protrusion 41 with the protrusion 55 of the lever 48. To prevent the contacts from re-closing without slowing down, the setpoint of triggering the ferromagnetic parts 33 and 34 (Fig. 1) is selected

somewhat lower, for example, by selecting the appropriate springs 35 and 36, than the response setting of the contact bridge 5.

FIG. 4 shows the retarder at

open

When the contact bridge 5 moves in the direction of opening (along the arrow), the protrusion 41 acts on the surface 54 of the lever 48 and moves the lever 48 along the longitudinal axis 53 to a position that does not prevent the movement of the contact bridge 5 in the direction of opening the contacts. spring 50 returns to its original position.

FIG. 5 shows the retarder when the contact system moves in the direction of the closure.

After decreasing the current to values below the device setpoint for current or disconnecting the current, the contact bridge 5 moves in the direction of the closing (in the direction of the arrow), the protrusion 41 engages with the protrusion 55 of the lever 48 and further the lever 48 rotates around its axis 52, while moves the part 44 along the longitudinal axis 43. Due to the mass of the part 44 and about

513706796

of the counter force of the spring 46. Thus, the proposed current occurs to slow down the movement of the limiting device for the automatic bridge 5 to closed position switches in comparison with

the During this time, the automatic breakout prototype allows a reliably disconnecting switch to be connected in series with the short circuit current at

with the device, breaks the electrical provision of self-return contacts

 This circuit and the closure of the contacts of the device, in the case of automatic collaboration, occurs when the switch is turned off. a switch.

The protrusion 41 is arranged in such a 10

Claims (1)

at the same time that when moving the contact formula of the invention the bridge 5 only under the influence of the pin 40 (Fig. 1) is provided with a hook-1, a Current-limiting device lazy protrusion 41 (Fig. 4) with a protrusion of the circuit breakers, 55 lever 48, and when moving, the supporting external insulating shell bridge 5 in the direction of the locking device and the contact in it (Fig. 5) disengaging the protrusion 41 from the you-system in the form of a contact bridge, with an approach 55 of the lever 48 is provided with a spring-loaded contact spring, with earlier moving contacts located around it . cycles, fixed contacts, the ratio of the forces of the springs 23 (figure 1) laid on the U-shaped tires, one and 46 (Fig. 3) must be such that the ends of which form arcs suppress the movement of the horns, while others are clamps contact bridge 5 in the direction of the lock-for connecting external conductors of contacts, arcing chambers, at least for self-installation of our contact at least one H-shaped ferromagnet 5 in the switched on position (figure 1), the element located inside Pon has the possibility of limited tires, and at least spinning around axis 21. Guiding rotary spring-loaded ferromi, when the contact bridge 5 moves, a magnetic part mounted with The grooves 18 and 19 of the front Krsh1-ability to interact with the H-shell 2. A different ferromagnetic element, sub-shaped parts 25 and 26, and a ferro-vigorous spring-loaded pin, the magnetic components 33 and 34 can be in the outer insulation insulated with one-piece or assembled from 35loche with the ability to interact ferromagnetic plates for reducing with a contact bridge and at least The influence of eddy currents. With one rotatable spring-loaded fer. When used with a non-magnetic part, the two springs 56 (Fig. 6) differ when moving with the aim of disconnecting the safety bridge 5, it is equipped with a contact glass, the presence of earrings 57 otherwise, axis and spring-loaded rusks 58, mounted on axles 59 and 60, and a lever, the contact spring allows compression of the springs 56 without coming out of the inside of the cup and rests at the same time, in an extreme open one end, into an insulating shell, the position of the contacts, the axis 60 should not be to others in the glass, at the bottom reach the line connecting the axis 59. protrusions are made on which an additional bridge has been installed, kine-pinned with an additional tic energy of the contact bridge 5 turns relative to the glass, on and moving with it the parts of the lateral surface of the stacks inside the insulating shell can be -50to a protrusion, spring-loaded a damper 61 is installed, a sub-crush cushion is installed in an insulation insulated with a spring 63, in which the cup 20 is displaced with the possibility of movement when the contact is touching the cup, the axis is located Coming to the direction of breaking. In the insulating sheath, a hole can be made in the dummy device, monopolar and multipolar. FIG. 2 which is located at one end of the example of the execution of a three-pole-spring-loaded lever mounted ycTpoficTBa.on axis with the possibility of longitudinal 7P706 :. and turning and the other one A spring loaded lever is capable of interacting with a protrusion located on the harsh side surface of the glass. /five Tl  36 X t 28 P iS P---./, , . . T7; t, about the t of those that are, with a go-about. The spring is made in a c, there are a few springs, and the following are located: a vrjioH aode to the contact bridge and l; r friend. M - P  5G 46 it3 f If 8 Fig. B  five 5if tfl eight 52 55 20 V / 20 6