RU2474908C2 - Fast-acting automatic circuit breaker - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: fast-acting automatic circuit breaker comprises a magnetic conductor of a magnetic latch, an anchor of a magnetic latch, two contacts, a pull-in electromagnet, a spring of contact pressing, disconnecting springs and a current sensor. Contacts are made as movable, with a drive of one contact from the anchor of the magnetic latch, and of the second contact - from a connecting pull-in electromagnet via a spring of contact pressing.

EFFECT: higher reliability and reduced dimensions due to simplification and reduction of a number of mechanism links.

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Description

The invention relates to electrical engineering, in particular to apparatus for switching DC circuits.

Patented automatic high-speed circuit breaker solves the problem of simplifying the mechanism for driving contacts.

High-speed circuit breakers are known from the following sources:

1. Golubev A.I. High-speed circuit breakers. M. - L., publishing house "Energy", 1964.

2. Patent for utility model RU No. 64432 H01H 77/0, 2006.

3. Patent for utility model RU No. 71815 H01H 77/06, 2006.

4. Patent for utility model RU No. 75896 H01H 77/00, 2006

5. Patent for utility model RU No. 80064 H01H 77/06, 2006.

As the closest analogue, the switch shown in the third source should be considered. This switch contains a base, movable and fixed contacts, including an electromagnet with a magnetic circuit and an armature, holding an electromagnet with a magnetic circuit and an armature, disconnecting a spring.

The main disadvantage of this design is that due to the separate placement of the mechanism and design contacts, the circuit breaker has large dimensions in length. Additional levers that hold the electromagnet and movable contact reduce performance. Partially this problem is solved in the high-speed switch described in the fifth source. In this design, the movable contact is rigidly connected to the armature of the holding electromagnet. The disadvantage of this design is the increase in dimensions in height due to the location of the movable contact on top of the drive, as well as in the switch shown in the third source, the presence of a complex and expensive to manufacture connection including and holding electromagnets. This mechanism consists of a guide and a roller. The complexity of this mechanism lies in the fact that the roller must move inside the guide, and at the same time, a guaranteed clearance must be ensured between the roller and one of the walls of the guide, which is technologically quite difficult.

This invention solves the problem of reducing the dimensions of the circuit breaker in height and the construction of the mechanism without complex connecting, expensive parts and devices.

The technical result that is achieved by the invention is to simplify and reduce the number of links of the mechanism.

The invention is illustrated by an example implementation.

Figure 1 schematically shows a patented switch in the on position; figure 2 is the same in the off position; figure 3 is the same in the position when the switch was opened by the emergency shutdown signal and the first movable contact moved away.

The automatic quick-acting switch contains a magnetic latch magnetic circuit 1, a magnetic latch anchor 2, two movable contacts 3 and 4, a retractable electromagnet 5, a contact pressing spring 6, disconnecting springs 7, a current sensor 8.

The switch operates as follows.

In the off position, the switch is in the position shown in figure 2. To bring the switch to the on position, first, a switching current is supplied to the winding of the magnetic latch of the magnetic latch 1, as a result of which the armature of the magnetic latch 2 is attracted, and the contact 3 becomes in the on position. In this case, the electric circuit does not close, since contact 4 is in the initial position. Further, the current in the coil of the magnetic circuit of the magnetic latch 1 is reduced to the value of the holding current. At this current magnitude, the magnetic latch electromagnet has a large attractive force and normalized speed when disconnected. Next, to turn on the circuit breaker, a switching current is supplied to the winding of the retractable turning on electromagnet 5. The anchor of the electromagnet 5, being retracted, carries contact 4. After the contacts of contacts 3 and 4 are in contact, the circuit closes, but the anchor of the electromagnet 5 passes a certain distance and compresses the spring 6, thereby providing contact click. The switch comes into the on position (figure 1). If a short circuit occurs at the moment of contact or after, the protected circuit, the current sensor 8 will give a signal and break the small holding current in the coil of the magnetic circuit of magnetic latch 1. At the same time, the magnetic latch is disconnected under the action of a breaking spring 7. There is a quick opening of contacts 3 and 4 The switch comes to the position shown in figure 3. Next, the current breaks in the coil of the retractable electromagnet 5, and the switch is turned off. Similarly, the circuit breaker will trip during an operational trip.

Thanks to these design differences, a circuit breaker has been created with reduced dimensions and increased reliability.

Claims (1)

An automatic high-speed switch containing a magnetic latch magnetic circuit, a magnetic latch anchor, two contacts, a retractable electromagnet, a contact pressing spring, two disconnecting springs and a current sensor, characterized in that the contacts are movable, the drive of one contact is a magnetic latch anchor, the drive of the second movable contact It is provided from the anchor of the switching-on retractable electromagnet through a contact pressing spring.

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