RU32319U1 - High Speed Automatic DC Switch - Google Patents

Description

Automatic high-speed switch

direct current

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

Known high-speed automatic DC switches, for example, the certificate of the Russian Federation No. 27737 for utility model H01N77 / 06 2003; Reference book on the adjustment of electrical equipment of industrial enterprises. Ed. M. G. Zimenkova, G. V. Rosenberg, E. M. Feskova. - 3rd ed., Revised. and add. - M .: Energoatomizdat, 1983, p. 236-238.

The closest to the patentable one should be considered a switch according to the certificate of the Russian Federation No. 27737 for utility model H01N77 / 06 2003.

This switch contains at least one movable and one fixed contacts, which disconnects the spring, the spring of free trip, the magnetic circuit with a holding coil, the main armature, the anchor of free trip and traction.

The disadvantage of this switch is the large size in height with a vertical arrangement of contacts, and with a horizontal arrangement of contacts, the reliability of arc extinction decreases when low currents are disconnected.

In addition, the moving parts of the above switch have a large mass, which reduces performance.

H01H 77/06 H01H 75/10

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

The technical result from the use of a utility model is to reduce the height of the switch with a vertical arrangement of contacts, as well as to increase the speed of the switch. To ensure this, the magnetic circuit is made H-shaped with a horizontal arrangement of side rods, while the main armature is connected to the movable contact through the free-release spring by means of rods, and the free-release anchor has a movement limiter for said rods.

The usefulness of the utility model is as follows;

With this design, the moving contact is affected by forces acting along one of the rods of the H-shaped magnetic circuit, that is, within the height of the U-shaped magnetic circuit, which reduces the height of the circuit breaker. A decrease in this dimension is also affected by the fact that in this case the holding coil is wound directly on the middle core of the magnetic circuit, which eliminates the gaps between the coil and the magnetic circuit. In addition, the efforts in the intermediate moving parts act only on compression and tension (there is no bending and torsion, as in the prototype), which makes them less massive, therefore, increases the speed of the circuit breaker.

The utility model is illustrated by an example implementation. In Fig. 1, a circuit diagram of a switch in the on position is shown; in Figs. 2 is a top view of the switch, in FIG. 3 shows the switch in the up-position, in FIG. 4 - the same in the off position.

The high-speed automatic direct current switch contains vertically located two movable contacts 1, two fixed contacts 2, a disconnecting spring 3, two free-release springs 4, a magnetic circuit 5 with a holding coil 6, a main armature 7, a free-release anchor 8 and traction.

The magnetic core is made H-shaped, its side rods are horizontal.

The main anchor 7 is connected to the movable contacts 1 through the springs 4 by means of rods 9 and 10, pivotally connected to each other. The free trip anchor 8 has limiters 11. The limiters 11 are made in the form of rods arranged horizontally along the rods of an H-shaped magnetic circuit. At one end, the limiters are pivotally attached to the free trip anchor 8, and the other end interacts with rods 10 in the upstream position of the switch. The stops 11 are installed in the guides 12.

The switch operates as follows.

When a switching current flows through the holding coil 6, the main armature and the free trip armature are simultaneously attracted to the magnetic circuit. The main anchor through the springs 4 and rods 9, 10 pulls the movable contacts along until the rods 10 abut against the stops 11. The main anchor continues to be attracted by compressing the springs 4. The switch remains in the up position (Fig. 3), while the holding coil flows switching current. The movable contacts 1 do not close with the fixed contacts 2. This is necessary so that the contacts of the circuit breaker do not close while a switching current of large magnitude flows through the drive coil, since if there is already a short circuit in the main circuit

short circuit, the drive will not be able to trip to the desired speed.

Then the holding coil switches to a lower holding current.

The free trip armature 8 cannot be held by the magnetic flux of the arms; its current in the pulled position drops off and releases the stops 11.

The springs 4 translate the contacts 1 into the on position and create a contact pressing, as shown in FIG. 1. The switch is ready for immediate tripping. In this way, the circuit breaker can be tripped freely.

In the off position, the movement of the main armature 7 is limited by a stop 13, as shown in FIG. 4.

As can be seen from the above, the forces transmitted from the main armature to the movable contacts of each pole are directed along one line located within the height of the H-shaped magnetic circuit. Due to this, the switch has a small overall height with the same power in comparison with the prototype. In addition, the moving parts of the patented circuit breaker (traction 9, 10) in comparison with the moving parts of the prototype have a lower mass, which increases the speed of the switch.

General Director of Technos / - - / crt - Y E.Sh. Muradov

Claims (1)

A high-speed automatic DC switch containing at least one movable and one fixed contacts located vertically, disconnecting a spring, a free trip spring, a magnetic circuit with a holding coil, a main armature, a free trip armature and traction, characterized in that the magnetic circuit is made of H -shaped with a horizontal arrangement of side rods, while the main anchor is connected to the movable contact through the spring of free uncoupling by means of rods, and the anchor is free astsepleniya has limiter these rods.