SU1334213A1 - Current-limiting circuit breaker - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to high-speed circuit breakers. The aim of the invention is to increase the current-limiting ability and the maximum switching capacity by abruptly changing the spring force, providing contact pressure. A slow-moving contact (IPC) 2, equipped with an electrodynamic limiting device made in the form of a double coil, when the rated current is conducted, is pressed to the moving contact 4 by a spring 19 supported by a spring-loaded stopper 26. Under a short-circuit current of the IPC 2, under the action of electrodynamic forces, it drops down breaking the electric depy while simultaneously squeezing the spring-loaded stopper 26. As a result, the IPC 2, together with the contact pressure spring 19, falls down, providing a sharp current limitation. The return of the IPC 2 to its original state occurs automatically after the termination of the shutdown process. 2 hp f-ly, 2 ill. § 15 П СО сою со

Description

The invention relates to c; 1; tyter;) - a technique, in particular, to a control unit with an automatic shutdown.

The purpose of the invention - 11op P: snie that - coherent and limit switching capacity,

On the flg, 1 is depicted by the head cxeiy; a current-gravity circuit breaker is in the position

Enabled; in fig. 2 - ma1: opodvuku- nish contact current limiter, its automatic switch, common fork,

The current-limiting autolepathic key 71 contains a bottom-up carrying bracket 1, which grasps a low-lift contact 2, fixed on the hinge 3, the under-supported / knuckle wheel 2 can be rotated around the hinge 3 by G1. The movable contact 4 of the jacket rotates around an axis reinforced

on the fixed support 5, the Flexible coupling 6, the movable contact 4 is connected to the output bus 7, the Sliding contact 4 via a system of breaking links 8 and 9 is connected to the fastener 10, which can rotate around an axis. mounted on a non-nut bearing 1 1. 071, the end of the lever 10 serves as the uglind of the link 8, and the other end of the lever 10 zadleple for the latch 12, which in turn is hooked to the disconnecting rail 13, having the ability to rotate on a non-detachable support 14. The latch 12 has the ability to rotate naughty | support 15. Operating spring: at t6 gsr pits one end of the hinge connecting the breaking pins 8 and 9, and the other to the G / s handle having the ability to pivot around the non-incorrigible support 18, contact pressing is provided between the 19 with a nut 20 of movable BIIH and 21 and with a sleeve 22, a cylindrical nut 23, nut 23 3 c: screw talled a la with take: burner screw; screw in inside the fixed cup 24 and 15 and corner blunt 25; loosed the foam, for example, in the form of an annular groove in which the spring-loaded stopper 26 is located. The spring 27 is wedge, g; it ends i in the plug-in screw 1 28, and the other is in the head of the gyro, moving screw 2. Stiffness and the working force of the iru-ns 27 in,: tko times less: estkos: those springs 9 "

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Between sedentary CSL-2 and C | 11od;) gokove, ear clip 1 is fixed, 1 new electrically insulated spring 29. T, aikoy 20 and traffic jams -) Intami 28 and 30 v:: the necessary efforts are made to the corresponding P) dinner. ra: the value of the sleeve 22 on the thread of the cylindrical nut 23 is produced

The first is a mini-arc, 1 contact 2, and the most adjustable contact splicing is achieved.

The maximum throttle 31 has a rod of 32 for action on rayi to y13,

In the automatic switch off position (fig. 2), the slow-moving contact 2 is pressed against the movable screw 21 with the spring 29. The head of the movable screw 21 rests under the action of € 1m spring 19 into the hole of the cylinder 22. The cylindrical nut and 23 together with the bushing 22 is held by a spring-loaded stopper 26. Prulan-ia 19 is compressed with a nut 20 to fit; or the beginning of contact pressure,

After power on; the automatic switch, the inactive contact 2 under the action of the movable contact 4, is displaced together with the movable screw 21 so that j is cracked by the slide In the movable screw 21 and the bottom of the sleeve 22, there is: t a gap equal to the failure of the contacts. At the same time, the spring 19 is compressed up to 31 of the ends; x is the cat of stroke presses, since the force of compression of the spring 27 is much less than the force of the spring 19, then the compression — the springs: 27 is essentially 1 o, and the contact pressure does not affect e:, c) The force of the spring; 1: s 19 is placed on the cylindrical nut 23; which is held in this position is stop 26.

Current limit of atomatic vil: the switch ria6oT; iC gf / ecutively.

When otk, lyukeki emergency current automatic s} ;: l: - ;; chat, n1, works differently. If the connected OK is greater than the setpoint for the current of the maximum tripping device 31 or less than the short circuit current, then the opening occurs after the uncoupling tripping, Opening: Pi 31, the trigger 31 is triggered and the rod 32 rotates the rail 13, releasing; pk 12, clockwise crpenve of the latch 12 by the osoviy of the operating spring 16 rotates prot in the clockwise direction, breaking the link 8 and 9. Connecting the stroke 4 under the action of the spring 16 starts

Turns clockwise, opens the chain. The sedentary contact 2 behaves in a manner known per se.

When short-circuit currents are disconnected, the electrodynamic current limiter works on the side of the slow-moving contact 2, in addition to the free-trip mechanism operating from the moving contact 4 (whose operation is described above). Under the action of electrodynamic forces arising in the double turn of the electrodynamic current-limiting device when the short circuit currents pass the sedentary contact 2 is thrown downward, overcoming the force of the springs 19 and 27. With a sufficiently large current, the spring-loaded stopper 26 is squeezed out of the coal page 25 and the sleeve 22 is lowered down 5 and the road has a slow-moving contact 2 from the action of the contact spring 19. Further movement of the slow-moving contact 2 occurs together with the sleeve 22 and the cylindrical nut 23. Due to the low inertia of the above-described system, the electric arc is introduced into the circuit to start the movement of the moving contact 4. Next, the free-release mechanism, which moves the flexible contact 4, increases the solution contacts, which contributes to even stronger current limiting and arc extinction.

After the arc extinguishes, the electrodynamic forces on the slow-moving contact 2 are zero and under the action of the spring 27, overcoming the force of friction of the spring-loaded stopper 26 and the cylindrical nut 23, the sleeve 22 begins to return to its original position until the spring-loaded stopper 26 again engages the recess 25. Reverse the movement of the sleeve 22 and the screw 21 pushing the slow-moving contact 2 is so slow that all post-processing processes are fully established.

In the case used; the current limiter is not in the automatic switches, but in the current-limiting attachments to them, when the movable contact 4 is replaced by a fixed current lead,

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in the lowering of chi, the common 1 aike 23, two depths of 25 are performed at different levels. In this case, the slow-moving contact 2 has two fixed positions: Enabled and Disabled. The subsequent closure of the contacts in this case is carried out manually by removing the pods {of the stopper from the upper recess.

The use of the proposed current-limiting circuit breaker (in comparison with the known ones) increases the current limiter and increases the limiting switching capacity (without reducing other technical and economic indicators), reduces the thermal and electrodynamic effect of short-circuit currents on electrical equipment and increases the reliability of its protection.

Claims (3)

1. A current-limiting circuit breaker, comprising a housing, an arcing chamber, a free-opening mechanism, a maximum current release, a spring-loaded contact system, the slow-moving contact of which is provided with an electrodynamic current limiter. made in the form of a double coil, which is characterized by the fact that, in order to increase the current-limiting and limiting switching capacity5, it is equipped with a movable screw with an adjusting nut, bushing, cylinder-nut, cup and spring-loaded stopper, in the case there is a glass in which a hole is made, the cylindrical nut is located inside the cup so that it can be moved thereon on its outer surface, a recess is made, the sleeve is screwed inside the cylindrical nut and an axial hole is made in the sleeve, The movable screw is located at the E axial hole of the sleeve, while its head rests on one of the end surfaces of the sleeve, and its end rests on the sliding contact, the adjusting nut i is located at the end of the movable screw, the contact spring is located outside the movable pint and rests on the adjusting nut and the other end surface of the hub, and the spring-loaded stopper are str 513342 with the possibility of interacting with yi - lumbing, performed in a cylindrical nut, through a hole and a glass, 2, Switch on p, 1, o t l and „: tea P1 ine by the fact that ensuring the automatic return of a slow-moving contact to the initial position, it is equipped with a return spring supported on the head of the movable screw. 136 3. The switch on the PP. 1 and 2, about t. P and h and y and so that, in order to enable the use of inactive contact in the current-limiting attachments, on the outer surface of the cylindrical nut) 1neno additional deepening with the possibility of interaction with it a spring-loaded stopper. 20 2B Editor A. Revin Compiled by V, Kokosov Tehred L. Serdyukova Order 3968/49 Circulation 69 VSHIPI State Committee of the USSR for inventions and discoveries 1130355 Moscow, F - 35, Raushsk nab., 4/5 Production and printing industry, dpry, e, g, Uzhgorod, st. Driveway Kor zector L.Zimokosov Subscription on . four