SU57459A1 - Device for control over working wires by lighting of shafts and tunnels - Google Patents

Description

The invention relates to a device for controlling the working wires by illuminating shafts and tunnels on the low voltage side by acting on a contactor in a high voltage circuit.

In the proposed device, in order to act on the phase contactor, to turn it on and off using a short-term short-circuit of any of the low-voltage circuits, a capacitor is connected in parallel with the terminals of the contactor to create a capacitive current in the primary windings of the group transformers; at the same time, the circuit of the coil of the contactor is conducted through the contacts of both relays switching on and off, and the circuit of the coil of the switching relay is conducted through the contact of the switching relay and the auxiliary contacts at the contactor. With such a device, the short-circuit of the low voltage circuit causes a change in the voltage drop in the primary winding of the transformer, which causes one or another operation of the coils of both the contactor and the two relays.

The drawing shows a diagram of the proposed device.

A capacitor K is connected in parallel with the clamps of the phase contactor B. The circuit of the coil 6 of contactor B is conducted through contacts 4–4 of the enabling relay PI and contacts 5–5 of the opening relay P, and the coil circuit 7 of the activating relay P is conducted through the contacts of the switching relay O3 and auxiliary contacts - / contactor.

When the knife switch P is on the circuit: the network phase, the capacitor I, contacts 5-5, the primary windings of step-down transformers and the network zero flow capacitive current. When this current passes through the primary windings of step-down transformers, a voltage drop of 10-20 volts is obtained. In this case, the on relay Pj keeps its contact 4-4 open and the lighting does not work. When any control button of the control unit is pressed, the voltage drop across the primary windings of step-down transformers decreases, as a result of which the relay of the relay closes its contact 4-4; the current passes through these contacts and the closed contacts 5-5 of relay P, as a result of which the contactor B is turned on and the lighting starts to work. When it turns on, the contactor B breaks the contacts / - / and turns off the coil of the Pb relay along with the contacts 2-2, it switches the capacitors to supply reactive energy to the network and when the lighting in the tunnel is working.

If, during the operation of the lighting, we press any control button of the CU that turns off the bare P, due to an overload, it will open its contacts and contact; turns off, i.e., the circuit will have a lic ond position.

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. ;. Present invention.

Claims (2)

1. A device for controlling the working wires by illumination of shafts and tunnels on the low voltage side by acting on a contactor in a high voltage circuit, characterized in that, in order to act on the contactor, to turn it on and off, by short-circuiting any of the low voltage circuits, parallel to the terminals of the phase contactor B, a capacitor L is connected to create a capacitive current in the primary windings of the group transformers, the contactor coil is conducted through the contacts of the switching relay PI and the turning off relay P, and the coil circuit of the turning on relay is conducted through the contacts of the turning off relay and the auxiliary contacts at the contactor. 2. In the device according to claim 1, use the auxiliary contacts of the contactor to connect the capacitor in parallel to the high voltage circuit when the lighting is operating.