SU445080A1 - Automatic starter - Google Patents

Description

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The invention relates to low-voltage electrical apparatus. And can be applied to remotely control electric drives and disconnect overcurrent and short circuit currents.

Ouokatel-automatic machines with a double break of a circuit per phase and a pass-through contact system are known, in which, at short-circuit currents, a moment-response mechanism from an electromagnetic release device is used, which first lifts a release device that produces a mechanical release of a contact tra: mobiles with moving contacts from the mass of the electromagnetic field of the drive, and then hit the contact rpaiBepce with the impactors, preventing moving contacts from the stationary ones.

The difference of the proposed device is that the electromagnetic drive, the torque actuator and the system of moving contacts are pivotally connected to different points of the same lever that does not have a fixed fulcrum.

In this case, in the motor control mode, the pivot point is the point of attachment of the drive of the torque actuating mechanism, and in the mode of short-circuit current disconnection, the point of attachment of the electromagnetic drive. This allows you to increase the reliability of the actuator. FIG. 1-3 shows three variants of the principal kinematic schemes of the automatic-actuator in the open position of the electromagnetic drive and the cocked position of the torque actuator (one phase is shown); in fig. 4-kinematic diagram of the automatic actuator (the first option) with the electromagnetic actuator in the on position.

The automatic starter contains an electromagnetic drive 1, a drive of the torque actuation mechanism 2, acting on the moving contact system 3 by means of a lever 4 with hinges 5-7, and ti pushers 8-10. The automatic starter has a fixed contact system 11, a device for protection against current, acting through a free tripping mechanism 13 on a moment-tripping mechanism 2, a return spring 14, one end of which is attached to 10 of the core 15 of the electromagnetic drive and the other to a fixed base the auto-starter, and two contact clips 16 and 17.

When the electromagnetic drive 1 is switched on (disconnected), the measles 15, lifting (lowering), causes IB to move the lever 4, whose fixed point of support is

hinge 6. There is a normal switching on (off) of the electric power receiver.

In the case of a short circuit (Fig. 4), the device 12 is triggered, mechanically acting on the mechanism 13, which turns off the mechanism 2.

In this case, the lever 4 is rotated around a fixed point of the pivot support 7, and the main electric circuit is opened by the moving contact system 3.

Subject invention

The automatic starter contains an electromagnetic actuator connected to a moving contact system, a fixed system

contacts, an emergency protection device, mechanisms of free tripping, a torque actuating mechanism with a drive acting on a low-lying contact system, characterized in that, in order to increase and reliability of operation, an electromagnetic actuator, a torque actuator and an articulated contact system are attached to different points of the same lever so that the points of support of this lever, depending on the operating mode of the actuator, can be alternately a hinge of an electromagnetic actuator or torque drive actuator.

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