SU98019A1 - Alarm device - Google Patents

Description

Widely known are devices for automatic signaling of the test system, operating on the principle of varying the current strength from a circuit, achieved by introducing resistance into the circuit.

The introduction of resistance resulting from the latching or opening of any of the contacts included in the beam circuit leads to a decrease in the control current to a value that causes the breaker to open. However, these known devices cannot be used to automatically trigger alarms in systems requiring | a) abatyvavaniya two-digit contact action, i.e., subsequent after releasing the breakage of the relay.

In order to provide the required automatic operation of the breakage relay after it is released, due to the introduction of resistance into the circuit, it is proposed to use the latter as a winding of the relay provided with a shorting part of this winding through a normally open contact of the self-closing of the relay.

.-- Latching or opening the contacts of the automatic signals of the generators entails the introduction of the winding beam of this relay into the circuit, as a result of which the control current is reduced and the open relay is released. Subsequent short-circuiting of a part of the relay coil causes the control current to increase to a value sufficient to trigger the open circuit relay.

The drawing shows the scheme of the proposed device in two versions - with normally closed (Fig. 1) and normally open (Fig. 2) contacts of automatic signaling devices. In the beam circuit (Fig. 1), the relay RI is turned on, the winding of which consists of two series-connected parts - low-resistance and high-resistance. The low-impedance part of the winding is permanently connected to the beam circuit. It provides the normal value of the control current at which the beam breaker relay PO operates, and the relay of the relay does not work.

Automatic signaling devices with normally closed contacts LrL Ap2 .... working on the opening, included among themselves

The sequence of the high resistance of the relay coil of the relay is seized. When any of these alarms are triggered, the circuit interrupting the high resistance of the relay coil of the relay leads to a large resistance. The current in the beam is attenuated luacTCJ; to a value less than the wound-off current of the relay PO breakage, which at the same time releases its measles. The sensitivity of the high-resistance part of the relay relay winding is such that a low current, setting up in the beam, is sufficient to trigger it.

After the RI relay is activated, the high-resistance part of its winding is short-circuited by its self-closing contact through its contact, as a result of which the force in the beam increases again to a value sufficient for the PO relay to activate, which reverses its measles and triggers the alarm signal. The PH relay remains locked through its self-closing contact and the downstream part of the winding.

In order to create a sufficient time delay for releasing the relay PO and subsequently triggering the auxiliary relay in parallel | 1 relay RI switch on the switch, the initial position of the relay relay is performed by turning off the blocking contact of the relay RI and closing the open contact of the automatic alarm device.

ycTpoiicTBo 110 of FIG. 2, in which the use of automatic signaling devices with short-circuited contacts operating on a short circuit, is only separated from the descriptive device by the fact that for inserting a high-resistance RI relay into the stump, the auxiliary relay R1I is in series with it.

Relay Р1И is chosen in the same way, so that its parameters but the operation current are equal to the parameters of the open relay. At the initial moment in the lz circuit, the control current normal to it is established, under the influence of which the relg P1I is triggered and its contact short circuits the relay coil.

Parallel to the relay R1I included normally open contacts Lz /, A2 .... automatic signaling devices. When any of these contacts is closed, the relay winding is short-circuited, it releases and in its contact breaks the circuit shunting the relay coil of the relay RI. RO. Relay RI works. the volley 1 shorts the high-resistance portion of its winding and blocks. At the same time, 1) barely RO again attracts CBoii measles and triggers an alarm.

Ire dmetet and io

A device for alarming the beam system, in which JOM during a canny jam or size1) When any contact is switched on on the day of a beam, a high impedance resistance is introduced into it, and the breakaway relay, which causes the purpose of ensuring the subsequent operation of the open circuit relay, which causes the receipt of an alarm signal, is the high-resistance impedance connected to the relay in the beam circuit formed by the winding of the relay provided with a shorting part of this coil Lo, conducted through a normally open co-hgact self-locking relay.

RI

R

FIG. one.

but,

/ U

FIG. 2