RU186626U1 - High Speed Automatic DC Switch - Google Patents

Abstract

The utility model relates to electrical engineering, in particular to protective switching equipment. The switch contains at least one vertically located movable contact and one vertically located conditionally fixed contact; breaking spring; U-shaped magnetic circuit with switching and holding coils; main anchor; free trip anchor; a rod with a roller and a contact spring. New is that the magnetic circuit is made U-shaped with a horizontal arrangement of side rods. Conditionally fixed contact is connected with the free trip anchor by means of a side rod, roller, contact spring. The movable contact is rigidly connected to the main armature of the switch. The upstream state is provided by the movement of the movable contact and conditionally stationary contacts; the switched on state is ensured by the movement of a conditionally fixed contact. Such a design makes it possible to reduce the dimensions with a vertical arrangement of contacts, simplify the kinematic scheme, and increase the speed and reliability of the mechanism. 3 of FIG.

Description

The utility model relates to electrical engineering, in particular to protective switching equipment, and can be used to protect against unacceptable overloads and short circuits of electrical installations and direct current lines.

Known are high-speed automatic DC switches; e.g. Golubev A.I. High-speed circuit breakers, M.-L., Energia Publishing House, 1964, pp. 55-57, RF certificate No. 277737 for utility model Н01Н 77/06 2003; RF certificate No. 32319 for utility model 7 Н01Н 77/06 of 09/10/2003; certificate of the Russian Federation No. 2239253 for the invention of October 27, 2004; certificate No. 32926 for utility model dated 10.27.2003, Handbook for the adjustment of electrical equipment of industrial enterprises. Ed. M.G. Zimenkova, G.V. Rosenberg, E.M. Feskova - 3rd edition, revised. And add. - M .: Energoatomizdat, 1983, p. 236-238; A.S. USSR No. 417856, H01H 77/06, H01H 75/10, 1974.

The closest to the patent should be considered a switch according to the certificate of the Russian Federation No. 2239253 for the invention of 7 H01H 77/06 of October 27, 2004.

This DC circuit breaker contains at least one movable and one fixed contacts located vertically, disconnecting a spring, a spring of free trip, a magnetic circuit with a holding coil, a main armature, an anchor of free trip and traction, the magnetic circuit is made H-shaped with a horizontal arrangement lateral rods, while the main anchor is connected to the movable contact through the spring of free tripping by means of rods, and the anchor of free tripping has a limiter of movement of these rods g.

The disadvantage of this switch is a complex kinematic circuit, leading to large mechanical losses, high current when the holding coil is turned on, a large number of links and parts.

A useful model solves the problem of creating a DC circuit breaker, characterized by high reliability when disconnecting both large and small inductive currents, increased speed and small dimensions.

The technical result that was achieved by using the patented circuit breaker is to increase its speed when disconnecting short circuit currents. To ensure this, the magnetic circuit is made U-shaped with a horizontal arrangement of side rods, and the main movable contact is mechanically rigidly connected to the main anchor of the electromagnet.

The electromagnet is made with two coils. The force required to turn on the circuit breaker is generated by both coils. One coil is used to hold the switch in the on position.

The essence of the utility model is as follows.

The utility model is illustrated by an example implementation. In FIG. 1 shows the circuit breaker in the open position, FIG. 2 shows a switch in the up-position, in FIG. 3 shows the switch in the on position. The switch contains a vertically arranged movable contact; a vertically located conditionally fixed contact disconnecting the spring, a U-shaped magnetic circuit with two holding coils, a main anchor, a free trip anchor, a rod with a roller and a contact spring. Conditionally fixed contact is connected with the free trip anchor by means of a rod, roller, contact spring. The movable contact is rigidly connected to the main armature of the switch. The upstream state is provided by the movement of movable and conditionally stationary contacts; the on state is provided by the movement of the movable contact.

This design allows to reduce the size, simplify the kinematic scheme, increase the speed and reliability of the mechanism.

The switch operates as follows.

When current flows through the coils 13, 14 of the switching current, the main armature 4 and the free trip armature 11 are simultaneously attracted to the magnetic circuit 11. The main armature pulls the movable contact 5 along it, compressing the disconnecting spring 2 using the link 3 until the main armature closes with the magnetic core 12. At the same time, the armature free trip 11 through the roller 10 and the rod 7 rotates around the axis 15 conditionally fixed contact 6, compressing the contact spring 8. The switch remains in the upstream state (Fig. 2), while turning on and holding the coil Cam flows including current. The movable contact 5 does not close with the conditionally fixed contact 6. This is necessary so that the circuit breaker contacts do not close while a large amount of switching current flows through the drive coils, since if the main circuit already has a short circuit, the drive will not be able to trip with necessary speed.

After that, the switching coil 13 is turned off, and the holding 14 switches to a smaller holding current, holding the switch with one coil provides a lower inductance of the control system and, as a result, a rapid decrease in the magnetic flux from the holding current when it falls off.

The free trip anchor 11, under the action of the return spring 9, cannot be held by the magnetic flux of the holding current in the drawn position, it disappears and the contact spring 8 brings the movable contact to the on position and creates a contact pressing (Fig. 3). The circuit breaker is ready for immediate tripping.

In the off position, the movement of the main armature is limited by the buffer 1, as shown in FIG. one.

As can be seen from the above, by securing the movable contact directly to the main armature and controlling the circuit breaker with the help of two coils, maximum speed is achieved, and a small number of mechanical elements between the free trip armature (rod, roller) and conditionally fixed contact reduce mechanical losses.

Claims (2)

1. The switch is a high-speed automatic DC, containing at least two vertically arranged contacts, disconnecting the spring, the magnetic circuit holding the coil, the main armature, the free trip anchor, characterized in that the magnetic circuit is made U-shaped with a horizontal arrangement of side rods, with two holding coils, the force required to switch to the on position is created by the operation of the switching and holding coils, holding the switch in the on position estvlyaetsya one retention coil, thus reducing the inductance when the holding current, and hence improve performance. 2. The switch according to claim 1, characterized in that the conditionally fixed contact is connected to the free trip arm by means of a side rod, roller, contact spring, the movable contact is rigidly connected to the main arm of the circuit breaker, the upstream state is provided by the movement of the movable contact and the conditionally fixed contacts, included the state is ensured by the movement of a conditionally fixed contact, which allows for a reduction in dimensions with a vertical arrangement of contacts, to simplify the kinematic scheme, the mind shit number of parts and units, to increase the speed and reliability of the mechanism.

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