Automatic switch

 

(57) Abstract:

Usage: the invention relates to low-voltage electrical switching apparatus, and particularly to circuit breakers. Electromagnetic shock breakers produce not only separation, but also the breeding of contacttitle off by moving the movable kontaktdaten up until he by selecting freeplay, activates the spring mechanism of a free trip previously recorded gearing. Movement accelerated and additional stretching of the electric arc is provided by the fact that the arcing tire provided with insulating coating, is placed between the introductory clip and dosagecialis camera so that together with ground fault loop limits the height of the set deeannah plates. According to the invention the dielectric rod shock electromagnetic release eliminates the ingress of hot gases at the nodes of vykluchateli. In the proposed circuit-breaker stretched electric pole .arc, moving disabling short circuit current, forms two branches and centre, getting on the part of the tire is not covered with insulating material, connects the arcing loop to one pair of the W hen arc and eliminates contacttitle and the releases of the electrical circuit previously extinction of the electric arc. 7 Il.

The invention relates to the field of elektroapparatstroy, particularly to circuit breakers designed to protect consumers of electrical energy and electrical networks against current overloads and short circuits.

Known electrical protection devices with the cavity of the refractory material filled with the current-limiting material included in the Daisy chain. When overload currents specified material evaporates, breaking the chain. In the improved construction, the resistance of the current limiting material in the initial state, unloaded parallel resistor, which takes part of the initial current overload. This improves the reliability breaking capacity when the current overload and short circuit [1]

The disadvantages of these switches include the complexity of the construct, the serial number of rated currents, it is not possible switching currents limit switching.

Known such limiting device for circuit breakers, the design of which is provided near the contact node for removal of two parallel arcs n is a mini-arc in case of short circuit in the circuit. The resistive film is covered with insulation, and on their surfaces which move the base of the arc cut through the insulation to metal track for educational travel. Thus when you move the bases of the arc across resistor arc horns or tapes connects increasing the additional resistance in series circuit breaker, which improves current limit [2].

The disadvantages of the known current-limiting devices circuit breakers include the inability to use, the stretching of the arc to increase the reliability of the switch, shunting the arc column of the resistance of the resistive strips, limiting the size of the input moving the bases of the arc resistance.

Also known circuit breakers with current limiting, which limit the magnitude of short circuit current is connected in the circuit of the electric arc current-limiting resistor [3]. The connection of the resistor in the arc occurs after the input of the electric arc in deionno the camera.

The disadvantages of this switch is not used, the stretching of the arc to the chamber entrance, arc length on size not prom base arc through the air gap, the transition of the air gap is not accompanied by the pushing action of the magnetic field of the short circuit current, because the area of the tire in the air gap parallel arc, which delays the inclusion of the resistor and reduces the reliability of the switching currents limit switching.

The closest in technical essence and design is the automatic switch, which managed to avoid the delay of the movement of the electric arc to demonym plates due to the additional impact of current-carrying arc suppression circuit loop and to improve dogovaranje switching the resistance of this circuit in a serial electrical circuit [4].

Automatic switch of known construction contains in the insulating housing, the contact device of the movable and stationary contacttitle, freewheel release and heat termobinamechesky release, interacting with him when overload currents, electromagnetic shock breakers with an air gap in the magnetic circuit consisting of a magnetic core and armature rod, interrupter device including arc chute with a set deeannah plates and located on Rasha when disconnecting the short circuit current, with ground fault loop bent closed circuit conducting current electric arc in an electric circuit is disabled during normal operation, consisting of two parts, one of which is located outside the plane of the arc of the tire, and the other in parallel adjacent to the fault bus.

Live the arc suppression circuit of the loop has a resistance equal to the resistance of the heat release, and narashino connected with it. In serial electrical circuit conductor circuit is connected with the divergence of contacttitle the transfer of the electric arc in the arcing bus. The heat release is de-energised.

A disadvantage of the known switch, chosen for the prototype is: low limit switching capacity due to the small garbage electromagnetic release rolling contacttitle from fixed, big time breeding contacttitle, minor changes in the overall resistance of the electric circuit after the electrical arc arc suppression circuit loop, bypass to ground fault on the bus, lack of stretching and low speed of an electric arc in the groove deeannah plates; lovelytamila and conditions of equality resistance of the arc suppression circuit loop resistance thermal release; irrational use of the volume of the body.

The invention consists in that in the automatic switch is used to accelerate the movement to demonym plates transfer the electric arc in the arcing bus with ground fault loop, when the short circuit current to achieve along with a large time reduction of motion increase of the electrical resistance of an electrical circuit with the additional stretching of the electric arc, for which the electromagnetic shock breakers to produce not only separation, but also the breeding of contacttitle off by moving the movable kontaktdaten up until he by selecting freeplay, activates the spring mechanism of a free trip earlier removal of the latch gear.

To accomplish this, according to the invention in an automatic circuit breaker arc suppression tire provided with insulating coating, is placed between the introductory clip and the arc chamber, which limits the height of the set deeannah plates, the distance in the air gap between the arcing bus and contacttitle more minimum distance from contacttitle to elektroizolyacionnogo the positive increase of the length of the pole of an electric arc, because it excludes bypass under tension. The amount of the additional stretching of the pole of an electric arc commensurate with the length of the insulating coating. The degree of influence of the stretching pole of an electric arc process Dagahaley in the proposed switch is determined by the placement of the insulating coating on arc suppression bus. Shutdown current short circuit is most effective if the distance in the air gap between the arcing bus and contacttitle more than the minimum distance from the insulating coating to contacttitle, i.e. when the additional stretching of the insulation coating is preceded by the movement of the electric arc by arc suppression bus.

Accommodation ground fault bus with ground fault loop between the introductory clip and the arc chamber allows the proposed switch to produce accelerated elongation of the pole of an electric arc using the coincidence of the directions of currents in the fault bus, the adjacent part of the fault loop and passing to the insulation covering the branches of an electric arc. In addition, this allows the switch to activate the movement of the pole electric dogugaeshi loop with the magnetic field deeannah plates.

In accordance with the invention reduce the time differences of contacttitle off is provided by the armature of the electromagnetic shock release associated with both contacttitle by means of a dielectric rod, which is placed between the mechanism of a free trip and devices interrupter and contact at a distance from the movable contacttitle smaller than the air gap of the electromagnetic shock breakers on the value of the free motion of a movable contacttitle and greater than the thickness of the active layer of the contact strips.

The compliance of conditions of placement of the dielectric rod and relationships with contacttitle allows the switch in modes of short-circuit currents the influence of the dielectric rod not only disconnect contacttitle, but to reject the stationary contacttitle movable by a distance exceeding its free running, i.e. to push the movable kontaktdaten on the zero position in less time and to reset the latch engagement.

Earlier to reset the latches engage the engagement of a spring force further speeding the breeding contacttitle is tattersalli in the "on" position is saved and complete deterioration of the active layer of the contact strips by eliminating the possibility of contact of the movable contacttitle to dielectric rod by placing the latter at a distance from the movable contacttitle, the greater thickness of the active layer of the contact strips.

The connection of the anchor through the dielectric rod with both contacttitle is the rational use of enclosure volume switch, allows him to act on the movable kontaktdaten as close as possible to the contact pad, where the resistance to movement is minimal.

According to the invention the dielectric rod not only shares contacttitle, but, being located between the mechanism of a free trip and a device contact and interrupter, eliminates the ingress of heated gases at freewheel release and heat release, leaving the gas one way to vent channels through deione plate interrupter chamber. The direction of movement of the heated gases coincides with the movement of the pole of an electric arc and reduces its time.

Comparative analysis on the listed differences between the claimed circuit breaker from the prototype confirms compliance with the criteria of the invention of "novelty."

A comparison of the proposed circuit breaker with prototype and other technical solutions in this field allows us to conclude sootvetstvjushchy switch is broken in the "on" position; in Fig. 2 is a kinematic diagram of the switch in the "on" position (the dashed line shows the shut-off manually from the position "On"); Fig. 3 is a circuit breaker in the context of the "Off hand" (the dashed line denotes the separation process and cultivation of contacttitle stem electromagnetic trip unit when the short circuit currents up reset latch engagement), and Fig. 4 is a kinematic diagram of the switch in position "Off hand" (the dashed line denotes the process of enabling manually from this position), and Fig. 5 is a kinematic diagram of the off position automatically Disabled when the reset latch precedes the separation of contacttitle, shows how to disable auto-reset latch; Fig. 6 and 7 kinematic diagram of the switch in the automatic disconnection when splitting contacttitle, leading reset latch engagement.

The proposed circuit breaker contains (Fig. 1, 3) in the insulating housing 1 with channels 2, 3 for removal of ionized gases clamps introductory 4, 5 for fastening the outer conductors, the contact device 6 fixed and mobile 7 contacttitle with contact nakedcute 13, bracket control 14 with a handle 15, the electromagnetic shock release 16 with an air gap 17 in the magnetic circuit of the magnetic core 18 and the armature 19 with a dielectric rod 20, whereby the anchor 19 is associated with both contacttitle, heat termobinamechesky release 21 on the bracket 22 that interacts with the currents tripping the latch gear 13 connected 23 and flexible flat conductors 24 with a movable contacttitle 7, interrupter device including arc chute 25 with a set deeannah plates 26, the arcing bus 27 with electrical insulating coating 28 and ground fault loop 29, the bent contour of two parts: 30 in parallel adjacent to the arcing bus and 31 is located outside the plane of the arc suppression bus 27.

Part 30 of the arc suppression circuit of the loop 29 is insulated by the gasket 32 from the arc suppression bus 27 and are connected by end 33 with part 31 in contact narashima with this tire, and the free end 34 opened in the window 35 of the introductory clip 4.

Arc suppression bus 27 with insulation cover 28 together with ground fault loop 29 is placed between the introductory clip 4 and the arc chamber 25 so that the adjacent part of the 30 arc-loops 29 it limits Vistula (before any contacttitle) is greater than the minimum distance S1from contacttitle to insulating coating 28.

Dielectric rod 20 of the armature 19 of the electromagnetic shock release 16 are accommodated in the housing 1 of the switch mechanism of a free trip 10 and devices interrupter and contact.

The distance from the end of the dielectric rod 20 to a movable contacttitle 7 is smaller than the air gap 17 of the electromagnetic trip unit 16 to the value of the free motion of a movable contacttitle 7, and larger than the thickness of the active layer of the contact strips 8, 9.

The proposed circuit breaker operates as follows.

1. In manual control when load currents do not reach the magnitude of the current operation of thermal release

InIload.< ICPT.< / BR>
a) Disconnecting the handle from the original "Enabled"

In the original "on" position the movable kontaktdaten 7 one end sits in the pins 37 of the release lever 11, the other free end rests against a stationary kontaktdaten, the contact pads 8 and 9 are pressed to each other. Bracket control 14 pojate to the end face 38 of the sidewall 10 of the mechanism of a free trip. Longitudinal osnasheniya O1staples control 14.

The force of the tension spring 12 attached to the rolling contacttitle 7 and the clamp control 14 F = Fto+Fwithat the bottom 39 and the top 40 points of engagement expands on the efforts of the F1Kand F1Cdirected respectively along the rolling contacttitle 7, staples control 14 and the efforts of the F2KF2Cholding them to the lugs 6 and 38. The handle 15 of the actuator and the indicator status of the switch occupies its extreme upper position (Fig. 1 and 2).

Restasis lever 11 is stationary, since the component of F1Kthe efforts of the tension spring 12, directed along the rolling contacttitle 7 to its pins 37, balanced on one side by the reaction of the axis of rotation O2with the other reaction latch engagement 13.

The load current passes from the introductory clip 5 by performing the mount 22 of thermal trip unit 21 via the heat release 21, 23 flexible flat conductors 24 to the rolling contacttitle 7, through the closed contact pads 9 and 8, the stationary contacttitle 6 through electromagnetic shock release 16 to the input terminal 4. Arcing loop 29 is not connected in the electrical circuit of the switch.

Pugacheva axis O1bracket control 14, stretches the spring 12 by translating the top of the gear 40 to the pin 37. With the tensile spring 12 correspondingly increase efforts FwithFtodirected along its longitudinal axis and F1CF1Kdirected along the staples control 14 and a movable contacttitle 7. The decomposition of the forces at the points of the mesh, 40 and 39 of the spring 12 is changed so that a reduced F2Cand F2K. Upon reaching the top point of the gear 40 of the spring 12 of the center pins 37 of the longitudinal axis of the spring coincides with the longitudinal axis of the rolling contacttitle 7, the force F2Kat the bottom of the gear 39 becomes equal to zero, and F1K= Fto. At the top of the gear 40 of the spring F2Cdecreasing retains the direction opposite to the movement, because the longitudinal axis of the spring 12 remains with the same side of the longitudinal axis bracket control 14.

Further rotation of the arm 15 of the bracket control 14 moves the upper point of the gear 40 of the spring 12 for the trunnions 37, translates the longitudinal axis of the spring 12 for the movable kontaktdaten 7. The force of the spring 12 in the new decomposition forms a force: F1Kis directed along the longitudinal axis of contacttitle 7 and F2K- disconnect contacted the pins 37, departs from the fixed contacttitle 6, severing the contact pads 8 and 9. Stocked spring 12 energy is spent only on the movement of the movable contacttitle 7, so before driving staples control 14 movable kontaktdaten 7 moves away from the stationary contacttitle 6 very rapidly. The electrical circuit of the switches is broken. Spark discharge between the contact plates 8 and 9 minor. Arcing loop 29 is left unconnected. The current is interrupted. Mobile kontaktdaten 7 still continues to rapidly rotate the roll 37 and moves the lower end of the gear 39 to the axis of rotation O1staples control. The longitudinal axis of the spring 12 is located along the longitudinal axis bracket control 14, when the lower point of engagement 39 reaches the axis of rotation O1. The force F2Cat the top of the gear 40 drops to zero, and F1Ccoincides with Fto. Transfer the lower point of engagement 39 of the spring 12 in the rotation axis O1staples control 14 results in the new decomposition of forces to the formation at the top of the gear 40 of the efforts of the F2C, provorachivayuschie bracket from the axis O1. Top 40 and the bottom 39 of the point of engagement of the spring 12, the clamp control 14, podi the staples control 14 and a movable contacttitle 7, therefore, the acceleration of the moving contacttitle 7 is reduced to achieve bracket control his 14 stops. Bracket control 14, aiming and rolling contacttitle 7, reaches another bend 41 rests on the shoulder fixed in the moment, the release lever 11 between the axis O2and the pins 37. The handle 15 is stopped at the position "Off manually without resetting gear. Continued movement of the handle 15 by the hand of the operator is not possible.

With a stop bracket control 14 power spring 12 is spent solely on an increase in the speed of the moving contacttitle 7. Mobile kontaktdaten 7, with the increased speed of turning the roll 37, meets another flat conductor 24.

With the termination of the turning bracket control 14 and a movable contacttitle 7 they pressed against the stops by the efforts of the F2Cand F2Kwhich components arranged at the points of engagement 40 and 39 of the force of the spring 12 (Fig. 4).

b) Enabling movement of the handle from the original "Disabled manually, without resetting gear".

The handle 15 by the force of the operator's hand, breaking the F2C, swinging the clamp control 14 from the axis of rotation O1counterclockwise is responsibly increase the forces in the longitudinal axes of rolling of contacttitle 7 and bracket control 14-F1Kand F1cand the efforts of the F2Kand F2cdecrease (Fig. 4).

When you move the top point of the gear 40 of the center pins 37 of the longitudinal axis of the spring 12 coincides with the longitudinal axis of the rolling contacttitle 7, the balance of forces at the points of engagement of the following: at the lowest point of the gearing 39-F2K= 0, and F1K= Fto; at the top of the mesh, 40 - F1c< Fcand F2c< 0 still has a direction opposing the motion. Further rotation of the arm 15 of the bracket control 14 and the upper transfer point 40 for engagement pin 37 provides the transition of the spring 12 on the other side of the movable contacttitle 7 and the efforts of the F2Kdecomposition of forces at the lowest point of the gearing 39 aimed to still contacttitle 6. At the top of the gear 40 forces maintain their original direction. Force F2Kmobile kontaktdaten 7 momento rotates the roll 37 and follow to still contacttitle 6, moves the lower end of the gear 39 to the axis of rotation O1methods of control 14. During the transition to the low point of the gear 39 for the rotation axis O1staples control 14 directions of the forces in it remain the same, but the alignment of the force of the spring at the top accuracy of the Nergy contractile spring 12 is spent on the simultaneous moving of the mobile contacttitle 7 and bracket control 14. Top 40 and the bottom 39 of the point of engagement tend towards each other. The speed of movement of the movable contacttitle 7 to still 6 decreases. The contact plate 9 and the movable kontaktdaten 7 reaches the contact plate 8 fixed contacttitle 6, serves him stop earlier than bracket control 14 rests on the end face 38 of the sidewall 10 of the mechanism of a free trip, making it a softer landing when the torque is switched on. The current passes through the electric circuit breaker. At the points of engagement of the upper 40 and lower 39 components of the force of the spring F2Kand F2cpress the movable kontaktdaten 7 and the clamp control 14 to their supports. The arm 15 is at the position corresponding to the position of the switch is "on" (Fig. 1 and 2).

2. In modes turn off automatically when the load currents, large current operation of thermal release, but smaller setpoint electromagnetic brake when the separation and dilution of contacttitle follows the reset latch engagement

ICPTIload< Iusta< / BR>
Heat termobinamechesky release 21 is heated by the load current, turns the latch 13 and frees restasis R is g 11 movable to pivot on the axis O2and its axle 37 to rotate in the movable contacttitle 7 and disrupt the existing balance of forces.

Getting the ability to be removed, the spring 12 tends to be closer to the top of the gear 40 on the bracket management 14 the lower end of the gear 39 on the movable contacttitle 7, one end of the contact plate 9 rests on the fixed contacttitle 6, and the other is the roll 37. The force of the spring 12 acting through the movable kontaktdaten 7 on the axle 37 of the release lever 11, it cranks the axis O2counter-clockwise. Restasis lever 11 moves the pin 37 in the direction of the top of the gear 40 on the arc of a circle with its center in the axis O2. The trunnion 37, following with ascepsymase lever 11, is rotated in the movable contacttitle 7 counterclockwise. Mobile kontaktdaten 7 one end of which follows the movement of the pins 37 on the arc of a circle, so it can be turned the other end of the contact plate 9 fixed contacttitle 6 and keeping contacts, slides over the contact pad 8, leaving in the direction of the freewheel release together with bottom gear 39. The longitudinal axis of the movable contacttitle 7 approaches the OS is non movable kontaktdaten 7 fixed to 6, drops to zero, and the force F1Kwhich presses the movable kontaktdaten 7 to the pin 37, coincides in magnitude and direction by the force of the tension spring 12. Bracket control 14 is still pressed against the end face 38 of the side walls 10 of the freewheel release force F2Cretained direction, because of its longitudinal axis has not lost its angle with the longitudinal axis of the spring 12.

Moving a movable contacttitle 7 due to the efforts of the contractile spring 12 pins 37 along the arc of a circle centered at the rotation axis O2release of the lever 11 at the upper point of the mesh 40 (corner pins 37 to the longitudinal axis of the spring 12) gives a decomposition of forces at the lowest point of the gearing 39 component of F2Kaimed at breeding contacttitle. Mobile kontaktdaten 7 rotates the roll 37 moving raczepluschee lever 11 counterclockwise and moves away from the stationary contacttitle 6, momento severing contact pieces 8 and 9.

At the time of separation of the contact strips all the energy of the spring is spent only on the increase in the speed of the moving contacttitle. Encountered an electrical arc is stretched between the contact pads that are at odds with bolloywood in the switch circuit, because the energy of the electric arc disabling currents up to 70 And minor, an electrical arc is dissipated, not reaching free from insulating coating 28 surface arcing bus 27(Fig. 1).

The point of the lower gearing 39 spring 12 continues to approach the axis of rotation bracket control 14 and moves it. The force F2cholding bracket control 14 to the emphasis tends to zero. Transfer the lower point of engagement 39 of the spring 12 in the axis O1staples control 14 restasis lever 11 free end 44 stops at the stop 45, the decomposition of forces at the top of the gear 40 resulting force F2c, provorachivayuschie bracket control 14 from the axis of rotation O1clockwise. The energy of the spring 12 is spent on the simultaneous movement of the bracket control 14 with a handle 15 and a movable contacttitle 7, so its speed is reduced before reaching the bend 41 of the bracket 14 of the stop - shoulder release lever 11 between the axis of rotation O2and the pins 37.

With a stop bracket control 14 the movement of the movable contacttitle 7 is accelerated again. Mobile kontaktdaten reaches its stop - flat conductor 24 and stops. The handle 15 is maktime plates 8 and 9 more than in the "Off manually by moving the movable contacttitle 7 by pins 37 to the mechanism of a free trip.

To resume manual control switch after automatic shutdown-reset latch is necessary to restore operation of the engagement release lever 11 with the latch 13 (Fig. 5). The platoon switch is maintained by the force of the operator's hands. The handle 15 is moved from a state corresponding to "Deactivated" in the direction of introduction of the clamp 5. The handle 15 swinging the clamp control 14 from the axis of rotation O1. As the clamp control 14 is pressed creases 41 to release the lever 11, it cranks it from the axis O2when this pin 37 is moved along the arc of a circle clockwise. With the beginning of the movement restasis lever 11 free end 44 away from the stop 45, moves the pin 37 with a movable contacttitle 7 down and stretching the spring 12, carries its point of engagement 39, 40 from each other. Mobile kontaktdaten 7 being pressed against the flat conductor 24 slides over it. Restasis lever 11 turns before entering the free end 44 of the latch 13 and the engagement with it. After engagement of the lever 11 saucily spring 12 at the points of engagement 39, 40 do not change direction, therefore, the movable kontaktdaten 7 remains pressed against the flat conductor 24 and the clamp control 14 to ascepsymase lever 11, approaching bends 41 closer to the pin 37. The handle 15 takes place corresponding to the position "Cocked" that is tantamount to "Disabled manually.

3. In modes turn off automatically when short circuit currents in the magnitude of currents in excess of the installation of the electromagnetic trip to currents limit of switching capacity of the switch, when the separation and dilution of contacttitle ahead of the reset latch engagement

IustaICCIPLCs< / BR>
Increasing the short circuit current passes through the circuit breaker. Tokorozawa loop 29 is not connected into the circuit breaker (Fig. 1).

When the short circuit current of the installation operation of the electromagnetic trip unit 16 magnetic flux in the air gap 17 magnetic circuit develops the force of attraction of the armature 19 (Fig. 1) to the magnetic core 18, overcoming the force of the pick. Anchor 19, rapidly moving to the magnetic circuit 18 reaches a dielectric rod 20 is movable kontaktdaten 7.

Dielectric ..... 11, discards movable kontaktdaten 7 from the stationary contacttitle 6. The contact strip 9, losing contact, is discarded from the contact pads 8. An electric arc with bases (reference basis points) spread contact pads.

Further spread of mobile contacttitle 7 dielectric rod 20 as the tendency of the armature 19 to the magnetic circuit 18 increases the length of the pole arc and near the lower end of the gear 39 of the spring 12 to the axis of rotation O1staples control 14 (Fig. 3 and 6).

In addition, the short-circuit current passing through the areas of contacttitle sufficient length to reason electric arc causes the magnetic force tending to move the electric arc as the jumper circuit contacttitle, arc horns. As the pole of an electric arc more mobile its grounds, at the moment of transfer of a movable contacttitle 7 lower point of engagement 39 of the spring to the rotation axis O1prior to use spring power both the Foundation of the electric arc are only available on the arc horn 42, 43 contacttitle and post electric arc witheveryone center pole of an electric arc to a non-isolated surface arcing bus 27 divides the arc into two branches B and C and uses arcing loop 29.

Branch electric arc B with a reference point on the arc horn 42 fixed contacttitle 6, the overlapping length of the air gap 36 and electrically insulating coating 28, shunted by resistor-fault loop 29. Full short circuit current passes through the branch C, then the contact point 46 of the center pole of an electric arc to arc suppression bus 27 is distributed towards the introductory clip 4 - part of it goes through the branch to the arc horn 42 fixed contacttitle 6, and the other part is on the fault bus 27, the arc suppression circuit of the loop 29. At the time of bypass branch B of an electric arc-fault loop 29 touch the center post of an electric arc to arc suppression bus 27 conductivity of the circuit breaker in comparison with switch without arcing loops increases, because the branch of the electric arc continues instantly no time to change its resistance, which makes the bypass reliable. Direction components of the short circuit current in branch B of an electric arc, arcing bus 27 and parallel to the adjacent part 30 arcing loops 29 one opposite to the direction of the current in the branch C. Therefore, one branch B surrounding part of the fault loop and the branch B) nestles provided with insulating coating 28 surface arcing bus 27, and another branch C - pushes the groove deeannah magnetic plates 26. The branch B of an electric arc as a conductor with current, does not interact with demoname plates 26, because they are made with the ledge 47 and branch C, interacting with demoname plates creates an electromagnetic force that moves it in the arc chute 25.

The most effective summation of the effects of magnetic flux in an electric arc in the process of its occurrence and movement is provided in the case of performing arc-bus 27 and the adjacent portion 30 of the current arc suppression circuit loop 29 of non-magnetic conductive materials. The same purpose is the location of the part 31 of the arc suppression circuit loop 29 away from the plane of the arc suppression bus 27. Conditions for burning branch B of an electric arc, is pressed against the insulating coating 28 arcing bus 27 and having a reference point (ground) on the arc horn 42 fixed contacttitle 6, it is complicated by the decrease in current, the cooling of the arc horns and intensive heat shock and the center post of an electric arc touch target 46 arcing bus 27. A branch B of an electric arc loses temperature, its resistance at itogo trip unit 16, selecting an air gap 17, reaching the magnetic core 18, closes the magnetic circuit (the resistance of the electromagnetic trip unit increases, the current in branch B is reduced) and a dielectric rod 20 pushes the movable kontaktdaten 7 bottom gear 39 of the spring 12 in the rotation axis O1staples control 14 (Fig.6 and 7).

The force of the spring 12 at the top of the gear 40 is decomposed into F1cdirected along the staples control 14, and F2c, provorachivayuschie bracket control 14 in a clockwise direction. Bracket control 14, turning contractile spring 12 has its axis O1brings the top point of the gear 40 fixed to the pin 37. The longitudinal axis of the spring 12 coincides with the longitudinal axis of the rolling contacttitle 7, effort, limiting his movement, drops to zero. When translating the top of the gear 40 per axle 37 of the spring 12, compressing cranks with acceleration simultaneously bracket control 14 from the axis O1and movable kontaktdaten 7 pins 37 in the direction of the convergence points of the gear 39 and 40. After the clamp control 14 bend 41 abuts rastersize the lever 11, and the handle 15 will take the extreme position, to move the movable contacttitle 7 setrace the C 43 with the reference point of the base of an electric arc in a groove set deeannah plates 26 and moving to focus 24 (flat conductor), stretches her post. Branch C of the pole of an electric arc, extended, overlaps the height h is set deeannah plates 26 interrupter chamber 25, the total length of the electric arc and its electrical resistance increases considerably.

The walls of the groove set deeannah plates 26 are protected by insulating plates 48 from contact with an electric arc, which prevents melting, loss of magnetic properties and saves the increase in the magnitude of the magnetic force acting on the branch C. Center branch C of the electric arc reaches first base groove deeannah plates 26.

With the separation of the contact strips 8 and 9, the electric arc heats and ionizes gases, excessive pressure develops.

As the anchor 19 through the dielectric rod 20 is connected with both contacttitle and does not lose this connection immediately after popping rolling contacttitle 7 for the zero position (communication mobile contacttitle 7 by a dielectric rod 20 with a fixed contacttitle 6 is broken after the release of the protruding edges 49 of the side end face of the movable contacttitle at the end of the dielectric rod 20), and the dielectric is m, the excess gas pressure is created in the limited, isolated from the volume occupied by the freewheel release and heat release. The heated gases are output to the bypass channels 2 and 3 anchor points on the basis of both branches of the electric arc, where the post its most heated and has a smaller diameter. The direction of movement of the heated gases coincides with the direction of the electromagnetic forces acting on the arc. Contributing to the movement of the electric arc, the heated gases push out some of its branches B in the air gap between the fixed contacttitle 6 and insulating coating 28 arcing bus 27. Branch B of the electric arc is extinguished. The extinction of one branch B of an electric arc still kontaktdaten 6 and electromagnetic release 16 are removed from the electric circuit breaker arc suppression loop 29 is connected in series, and another branch C gets a new base reference point 46 on the hot surface arcing bus 27. Connectivity-fault loop 29 in serial electrical circuit breaker limiting short circuit current and contributes to Dagahaley, because active electrospray who continues to rapidly move. One basis under the total influence of the magnetic fields of the currents in the arc suppression bus 27 and the adjacent part 30 arcing loop 29, the same magnitude and direction of the efforts of attraction deeannah plates 26 and pushing the heated gases, instantly moves over the surface pressure of the tire to its free end, and the other base with rolling contacttitle 7 passes on a flat conductor 24 than excludes movable kontaktdaten 7 of the circuit breaker. Completes the occurrence of the pole of an electric arc in the bottom of the groove deeannah plates. The basis of the electric arc continues to move over flat conductor 24. Heated ionized gases passing through the outlet channel 3, exclude from the electric circuit breaker thermal trip unit 21, closing its conductive mount 22 with the flat conductor 24. The exception to the electric circuit of the switch circuit rolling contacttitle 7 and thermal release of 21 does not stop the fall of the short circuit current because the resistance of the fault loop is significantly superior to their resistance. The electric arc is extinguished. Anchor 19 electromagnetic trip unit 16 is returned to its original state under action is clucene manually". With the removal of the latch 13, the end 44 of the release lever 11 is released from engagement under the action component of the force of the spring 12 of the lever 11 turns on the axis O2, transferring the trunnions 37 and acting on the bend 41, expands the axis O1bracket control 14. The free end 44 of the release lever rests on the stop 45. Mobile kontaktdaten 7 without losing contact with the stop 23, it goes in the direction of the mechanism of a free trip. The handle 15 is translated by a clamp control signal "Off automatically (Fig.5).

This is the process of disabling the proposed circuit breaker short circuit currents from 200 to 3500 A, causing a "short arc", the slaking process which is determined mainly by the rate of stretch, long stretch, electrodynamic forces.

Disabling currents from 3500 to 10000 A growing share of influence on time of the electric arc electrode processes. The electric arc is extinguished in these cases, after the arrival of mobile contacttitle 7 at the position corresponding to "Deactivated".

Disable short circuit current of industrial frequency value to 10000 A, inclusive, at a voltage of 380 B prees tilt arc suppression bus 27 to the plane of contact of the contact strips 8 and 9, an air gap 36, the length of the insulated surface arcing bus 27, the mass deeannah plates 26 and the height of the set h are chosen according to the maximum value of the expected power outage and, as a rule, it is increasing. It also changes when the selected weight deeannah plates orientation of the height of the set.

The proposed circuit breaker has advantages compared with prototype:

- has a high switching capacity, commuting currents of 10 kA at a voltage of 380 V;

- has a large tokoogranichitelnye due to fast movement and additional stretching of the electric arc, which supplies the circuit breaker is increased the electrical resistance of the current-limiting loop;

- more simple design - does not require for the disabled in the initial state arc suppression loop detachable connection with the elements of an electrical circuit breaker;

rational for using the volume of the body and protect the nodes from the action of the heated gases.

Circuit breaker containing located in the insulating housing, a contact device having a movable and a stationary contacttitle and contact pads, the mechanism of load, electromagnetic shock breakers with an air gap in the magnetic circuit consisting of a magnetic core and armature rod, interrupter device including arc chute with a set deeannah plates and located at the distance of the air gap from contacttitle arcing bus with ground fault loop bent closed circuit for ground fault bus, consisting of two parts, one of which is located outside the plane of the arc of the tire, and the other parallel to the fault bus, input clamp, wherein the arc suppression tire provided with insulating coating, is placed with ground fault loop between the introductory clip and the arc chamber, what is the distance in the air gap between the arcing bus and contacttitle more minimum distance from contacttitle to the insulating coating, and the anchor shock electromagnetic release associated with both contacttitle through the dielectric rod, which is placed between the mechanism of a free trip and devices interrupter and contact at a distance from the movable contacttitle smaller than the air gap of the electromagnetic shock release on ladok.

 

Same patents:

Automatic switch // 2100863

Automatic switch // 2074441
The invention relates to low-voltage electrical switching apparatus, particularly to circuit breakers

Arc chamber // 2041528
The invention relates to elektroapparatstroy and can be used in low-voltage switching devices, in particular in the contactors AC / DC

FIELD: mechanical design of electric switching apparatuses and method for their assembling.

SUBSTANCE: proposed electric switching apparatus has arc-control casing designed to accommodate at least one pole arc-control unit that incorporates two laminated arc-control units disposed either side of movable contact bridge along horizontal axis. Arc-control casing has first member incorporating base formed by first horizontal side of switching apparatus to organize chamber that has space for first laminated arc-control unit and second member connected to first one; second member has base formed by second horizontal side of switching apparatus opposing first one to form chamber that has space for accommodating second laminated arc-control unit.

EFFECT: enhanced mechanical strength and tightness of switching apparatus at superhigh gas pressures, facilitated assembly and reduced time required for this procedure.

15 cl, 7 dwg

FIELD: electricity.

SUBSTANCE: circuit breaker is designed to pass and interrupt current in the main circuit. The circuit breaker includes an arc-suppression device with an arc-suppression facility, a magnetising coil (11) and a group of electrode facilities (9, 10) coupled electrically to the magnetisng coil (11). Fixed (5) and movable (6) contact elements in the first position are interconnected so that they can pass current in the main circuit. The contact element (6) is transferred into the second position remote from the contact element (5) with current interruption in the main circuit and shift of an occurring arc (17) to the arc-suppression facility. The group of electrode facilities (9, 10) is designed to interact with the arc (17) with the creation of excitation current by arcing in the coil (11). The arc-suppression facility includes a group of magnets (15, 16) creating a magnetic field (B15, B16) oriented radially to the arc and a force (F15, F16,) that shifts the arc (17) for the purpose of the arc (17) interaction with the group of electrode facilities (9, 10).

EFFECT: developing the circuit breaker capable to interrupt rather low current in any direction.

8 cl, 11 dwg

FIELD: electrical engineering.

SUBSTANCE: device for electric protection comprises at least one switching module with contacts, installed on mounting base, and also comprises a control device with an electromagnetic coil placed close to one of said modules. Electric protection device also includes magnetic screen (22) arranged in a plane substantially perpendicular to plane of mounting base. Screen (22) is located between control device (1) and switching module (2, 3) and comprises at least one ferromagnetic part (22a) made so that screen performs magnetic direction of arc during separation of contacts, in order to increase component T of translation Laplace force acting on arc, during separation of contacts.

EFFECT: technical result is design of electric protection, having a simple design and improved interruption characteristics.

10 cl, 9 dwg

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