SU27133A1 - High Speed Circuit Breaker - Google Patents

Description

High-speed circuit breakers are already known, consisting of a fixed magnetic circuit with two windows, equipped with holding coils, connected to a circuit of a current source of approximately constant voltage, and axially movable core connected mechanically with a moving contact and surrounded by a switching coil, included in the protected circuit. It is also known to use in high-speed switches of the magnetic circuit, a part of which, carrying the holding rollers, is made of massive iron. The present invention relates to a device of such a switch and consists in a special structural form of its implementation.

The drawing is a schematic, eski shows the proposed switch.

The movable core 3 of the switch, orbited by the coil 6, connected to the circuit to be protected through contacts 2 and 1, and connected to one of these contacts (movable) by means of a hinged arm 11, is also connected by a system of levers with a pawl 14, serving, when the switch is turned on, for the fixed core 15 of the turn-on coil 8 and the associated levers 9 and 13 of the core 4 for the fixed state of the core 4. The core 4 is located next to the above mentioned core 3 on the same geometrical axis and forms with it, part of the way for the magnetic flux generated by the holding rollers 7.

Swivel dog 14 with the main lever 11 carried out so that, when the core 3 moves upwards, the dog 14 releases the lever 9, and when it moves down it jumps over its protrusion and keeps the core 4 in a certain position as a result. When the switch is turned off (none of the coil circuits is stuttered), the core 3 is pushed up by the action of the spring 10, the contacts 1 and 3 are open and the pawl 14 does not hold the lever 9.

When the switch is turned on, first of all the circuits of the coils 7 are closed, as a result of which the core is attracted to the core 3; then the circuit of the auxiliary (including) coil is closed. 8, the core 15 of which moves upwards, and the core 4 connected to it with levers 9 and 13 carries the core 3 along with it, and then lowers and closes the contacts 1 and 2 of the switch.

If at the moment of switching on the protected circuit there is a short circuit, then the core 3 will become otorvet or

core 4 and will open the contacts 1 ly. Thus the circuit breaker has a free trip.

Under normal conditions, the pawl 14 will jump over the protrusion of the lever 9 at the moment when the contacts 1 and 2 are pressed tightly against each other, after which the circuit of the coil 8 opens and the switch remains on and ready to protect the line.

at the moment of short circuit in the protected circuit, the magnetic flux of the coil 6 will spread mainly in the upper part of the magnetic circuit made of thin transformer iron, and not along the cores of the coils 7 (for which the latter can be, for example, made of solid iron). Thus, due to the fact that the magnetic interaction between the core 4 and the core 3 does not increase, and the force of pulling the core 3 upwards increases simultaneously with the increase of the overcurrent, the core 3 will immediately be torn off from the core 4 and produce opening 11 of the contacts 1 and 2.

In case of using a switch for protection against reverse current, the all magnetic system must be made of laminated transformer iron and equipped with magnetic bridges 5, 5, forming an additional scattering path for the magnetic flux of the coils 7 parallel to the main locking through the cores Zi 4. When the current direction changes In the protected circuit, and, consequently, in the coil 6, the direction of the magnetic flux created by this coil changes, and the opposite, demagnetization of the upper part of the core 3 and the heart 4, at which the magnetic fluxes of the coils 7 are deflected and pass through the bridges 5. The core 3 is detached from the core 4 and opens the contacts 1 and 2.

If there is an additional time relay, the auxiliary contacts of which are included in the chain of holding coils 7, the combined action of the automaton can be achieved, i.e. - its quick response only to cutting, cue supercurrent jumps (short circuit) and switching off at normal or slow speed at normal

increasing current from simple overload. Equally, with the help of the same relay, the switch can be made fast at reverse current and slow at rising current from overload.

Formed when contacts 1 and 2 are opened, the volt arc is blown up under the influence of a strong electromagnet 12, on the spark-horn horns 17, and from there on the pads 16 connected to each other by induction-free resistances 18.

The resistances are hung outside the spark-arresting box to the copper studs to which the pads 16 are attached. The arc between the plates is extinguished due to the round holes drilled between the plates.

The subject matter of the invention.

Claims (3)

1. High-speed circuit breaker consisting of a magnetic circuit, stationary with two windows, superimposed on it by holding coils, powered from a current source, approximately, a constant voltage, and a core moving in the axial direction, mechanically connected with a movable contact and surrounded by a switching coil included in the protected circuit, characterized in that next to the said movable core 3 on the same geometrical axis there is a second movable core 4 connected by means of -mechanical transmission 13, 9 to 15 comprising core and coil 8 forming the core 3 together with part of the magnetic path for flux generated by the coil holding 7. 2. The form of the switch according to claim 1, 1, characterized in that the core 3 is connected by means of a mechanical transmission with the pawl 14, which serves to keep the cores 15 and 4 in a stationary state with the switch in the on position. 3. With the switch according to claim 1 and 2, the use of magnetic bridges 5, forming an additional scattering path for the magnetic flux holding the coil 7, parallel to the main locking path through the cores 3 and 4.