SU656124A1 - Automatic quick-acting switch - Google Patents

Description

The invention relates to electrical engineering, and more specifically, to devices intended to limit the current and have an increased speed.

High-speed switches of direct current are known, which contain a contact system consisting of moving and fixed contacts, an arcing system, holding an electromagnet, ensuring that the contacts of the switch are held in the on position and a disconnecting spring.

Due to the insufficient speed of such switches, they have low reliability: when the emergency current switch is turned off, the valve fuses of the semiconductor converters are burning.

One of the means to increase the speed of switches is to increase the breaking spring force.

Along with increased speed, these switches have a complex structure.

Of all the known switches, the closest to this invention is

the technical essence and the achieved result is a fast-acting 1 th current-limiting auto-current 1 {DC power switch containing a contact system, a state and; of a moving and fixed contact, a holding electromagnet, a quadrupole key element, an induction-dynamic drive, a shunt, and two the tripping device, the first of which consists of a holding is disconnecting electromagnets, and the second is of a shunt with an amplifier (active four-pole), a key and an induction-dynamic drive designed open for contacts independently of each other.

Possessing increased speed, such a switch has a rather complicated structure; it contains two trippers, each with its own relay (sensor) and operating independently of each other;

The implementation of an active quadrupole according to the DC amplifier circuit requires an autonomous stabilized power source, and, in addition, it has an unacceptably low noise immunity.

that nptibGAiiT to conizsnik) iaduzh) works include.

The purpose of this image is to simplify the design and increase the reliability of the switch.

This goal is achieved by the fact that a high-speed circuit breaker containing a contact system consisting of moving and fixed contacts, an arcing system, a holding electromagnet, a key, a key element, an induction dynamic drive and a quadrupole, and an overcurrent relay whose disconnecting contact is on Consequently, in the coil circuit of the holding electromagnet and connected to the input of a quadrupole, made passive, and connected to an inductive bioperodynamic drive through a key element designed to control the key, providing a synchronous supply of signals to the actuated holding electromagnet and an induction dynamic drive.

FIG. Figure 1 schematically shows the automatic current-limiting switch for the fast-acting automatic shutdown switch; in fig. 2 shows a diagram of a passive quadrupole (pos. 13 of FIG. 1).

The switch has a contact system consisting of movable 1 and fixed 2 contacts; a holding electromagnet consisting of a magnetic core 3, a core 4, a holding coil 5, in the circuit of which it is disconnected openly P1 contact 6, an overcurrent relay and a disconnecting spring 7. Anchor 4 is connected to moving contact 1 through t 8. is performed by a spring 9. The induction-dynamic drive consists of a coil 10, copper .a, iiCKa 1, connected via a lever 12 with a fixed contact 1 of a switch. The passive quadrupole 13 consists of capacitors 14 and 15 connected in parallel: 1elpo to the disconnecting contact 6 of the overcurrent relay, dynistor 16, a pulse transformer 17 connected to the control element of the thyristor of the key element 18, designed to discharge the precharged capacitor 19, on the coil 10 induction-dknamicheskogo drive.

The arcing system consists of a magnetic blower coil 2, which is simultaneously a fixed contact 2, arcing horns 20, 2 arcing contact 22 and an arcing chamber. In addition, the circuit breaker is provided with conductive rails 23, 24.

The current protected by the circuit breaker passes through the bus 23, the magnetic blowing coil, the fixed contact 2, the moving contact I and the bus 24.

On the other hand, the bark 4 is pulled to the pragmatic pole of the core 3 and held in this position by the magnetic flux created by the current in the coil 5. The magnetic force of attraction 4 of the core exceeds the force of the spring 7 and the contact spring 9, seeking to tear the measles 4 from the core 3.

When the current increases to a predetermined value, the contact 6 of the overcurrent relay opens in series with the coil 5 of the holding electromagnet. The voltage appearing at the same time on the contact 6 of the relay is fed to the input of the passive two-port network 13. Under the action of this voltage, the capacitors 14, 15 are charged. When the voltage across the capacitor 14 is equal to the switching voltage 16 and the switching voltage 16, the latter switches and discharges the driver; ator 14 to the primary winding of the pulsed transformer 17. In the secondary winding of the transformer 17, a current pulse is induced which opens the thyristor 18, as a result of which the precharged capacitor 19 discharges on drive coil 10 induktsionnodimamicheskogo representing the other in this particular case, the transformer is short-circuited with movable secondary winding. When supplying it, Im) Ca current to the primary winding (coil 10) to the second winding (copper disc 11) 1 leads the reverse current. A magnetic field appears between the windings, under the action of which the disk 1I pushes away from the coil 10 and acts on the moving contact 1 of the switch. At the same time, the process of the release of the energy of the co-sensor 19 to G ере emep1, the development of the movable contact 1 of the switch, proceeds fairly quickly.

The disk 11 of the induction-dynamic drive acts directly on the movable contact 1 of the switch, min. Intermediary links of the mechanism, ensuring the shortest proper opening time of the contacts 1, 2. The capacitor 15 contributes to the rapid current decline in the coil 5 of the holding electromagnet, as a result Keeping the measles in the included m state, while the last node, by the action of the force of the tripping spring 7, is switched to the deactivated position. Without a capacitor 15, when switching the di- nistra 16, contact 6 of the overcurrent relay will be short-circuited by the primary winding of the transformer 17 and the measurment 4 of the holding electromagnet will not turn off.

The use of the claimed high-speed automatic current-limiting