SU726599A1 - Arcless switching ac contactor - Google Patents

Description

(54) AC CONTACTOR WITH BEZDUGOVA

By commutation

i

The invention relates to the switching of on-line devices with non-arcing switching.

An AC-contactor with an arc-free commutation is known, comprising a contactless switching element connected in parallel to the main contacts, controlled by auxiliary contacts mechanically connected to the main contacts i.

However, this device has low reliability due to its complex structure.

Most. The technical device and the achieved result close to the invention is an AC contactor with arc-free commutation, containing a transformer), the primary winding of which is connected after: 19 with main contacts, ti is secondary connected to the control circuit of the contactless switching element and connected parallel to the main contacts 2. .

The disadvantage of this device is the power loss.

The purpose of the invention is to reduce energy loss.

For this, the contactor is provided with an additional contactless switching element, connected in parallel with the main contacts via the secondary winding of the current transformer, also connected to the control circuit of this element.

o

The drawing is a schematic diagram of an AC contactor.

In the on state of the contactor by its closed main contacts 1 and the primary winding 2 of the transformer

Claims (2)

5 current flowing load current. The EMF of the secondary winding 3 is applied to the control. The main and additional contactless switching elements 4 and 5 are in operation. Element 4 cannot be switched on, since the voltage on its power supply is low, equal to the voltage drop on the closed main contacts 1 and winding 3. To the power circuit of the element 5 through a closed contacts 1 and winding 2 apply EMF of winding 3, under the action of which element 5 is triggered, the labeling 3 through contacts 1 and winding 2. At the same time, the current transformer switches to a mode close to the short for 1st circuit, and the voltage on winding 3 drops. At the beginning of the opening of the contacts I, the voltage on them increases, and accordingly the voltage increases by 3 and on the power circuit of the element 4, which turns on and shunts the contacts 1, which ensures the non-arcing opening of the contacts. The EMF on winding 3 disappears, and the voltage from the control circuits of elements 4 and 5 is removed. Element 4 will be turned off when the current passes through the left loop value, and this completes the process of disconnecting the load current ... . 7 9 Claims of the invention AC contactor with arc-free commutation, containing a current transformer, the primary winding of which is connected in series with the main 1 contacts and the secondary is connected to the control circuit of the contactless switching element connected in parallel with the main contacts and in order to reduce energy losses, it is provided with an additional contactless switching element, connected in parallel to the main contacts through the secondary winding of the current transformer, Also connected to the control circuit of this element. Sources of information taken into account in the examination 1.Patent of France No. 14325 U, cl. H O1 H, 9/00, 1966. 2. USSR author's certificate N9 335728, cl. H 01 H 9 / OO, 1972.