SU112835A1 - Current relay - Google Patents

Description

Dual-crush current relays built into oil circuit breaker actuators consume more power and have a low return coefficient. Their time delay depends on the magnitude of the response current.

The disadvantages of these relays should also include this. that no more than three such relays should be embedded in existing designs of irides, while in order to perform reliable protection it is often necessary to install a larger number of them.

In order to eliminate these drawbacks, it is proposed to supply the magnetic system of the relay with two pos; 1 blower with electric windings. One of these windings controls the gear that is triggered by the short-circuiting short circuit and acting on the switching mechanism. Another winding controls a switch that is triggered by an incomplete short circuit and activates the clock mechanism, opens after a predetermined interval of time, a normally closed contact, idunting part of the first winding.

Such an implementation of the relay allows to perform protection circuits with a smaller number of relays and to simplify protection devices on operative alternating current.

The drawing shows a schematic diagram of the proposed relay.

The relay has two cores 7 and 2 and two successively connected windings, each divided into two sections, which are located on the closed magnetic circuit 3. The winding with sections 4 and 5 controls the core 1 and creates a magnetic flux, closing through the extreme rods of the magnetic circuit. A winding with sections b and 7 creates a flow closing through the bark 2.

The relay has two contacts; normally closed contact 8, installed on the clockwork mechanism and the unlocking section 7 pos.-t t of the set time delay, and normally open contact 9, closing section 5 when the cor / triggered.