SU1223381A1 - Device for transmission of signal via wires of threephase electric power line - Google Patents

Abstract

The invention relates to electrical engineering. The goal is to provide signal transmission in non-phase line mode. At the moment when phase A has a high, phase C has a low potential, and the control electrode of the thyristor (T) 1 received a pulse from control unit 3, the instantaneous value of the current flowing through the open T 1 will be 3 b .- Qoe g (1) where Eg is the rectified value of a three-phase alternating voltage; t is the open time of T; R is the resistance of the circuit consisting of the internal resistance T 1, the active resistances of the windings of the power network, the resistances of the inductors 5, 5j, 5j, 2, the resistances of the diodes (D); 6,, 62, 6j and 7,, 7, L, + Ls4L,,. where Ld L (. is the inductance of the windings of the network tr-ra; L is the inductance of the additional coil 5, 5, 5 through which the current flows} L2 the ductness of the 1st coil 2. At t, the fusion (I) takes the form). (2) Current recharge capacitor 4, flow through the circuit: 1-ka gO th with co 00

Description

Carcass 2 — Capacitor 4 — T 1 recharges Capacitor 4 with reverse polarity. At the 2nd half-period of free oscillations of this circuit, the current changes its direction. T 1 is locked when the current of this oscillating circuit exceeds the value of the current determined by the suppression (2). At this moment, the current will go along the circuit: phase A - additional coil 5, 1.

The invention relates to electrical engineering and can be used when transmitting signals over a three-phase AC mains.

The circuit is an extension of the functionality by ensuring signal transmission in the case of an incomplete phase transmission line mode. .

The drawing shows a functional diagram of the proposed device.

A device for transmitting signals through wires of a three-phase transmission line contains a thyristor 1, a first inductor 2, a control unit 3, a capacitor 4, additional coils 5, - 5 inductors diodes 6 - DB, additional diodes 7, a resistor 8.

The device works as follows.

If phase A is currently high and phase C is low, and the control electrode of thyristor 1 has received a pulse from control unit 3, the current path through the open thyristor is as follows: phase A is additional coil 5, inductance, diode 6 | , thyristor 1, first coil 2 inductance, additional diode 7, phase C.

The instantaneous value of the current is determined by the expression

- V () J

where E is the rectified value of a three-phase alternating voltage; t is the open time

thyristor;

23381

D, - resistor 8 - capacitor 4 - additional D 7 - phase C, reloading capacitor 4 after a time equal to or a multiple of t (T is the switching frequency period T 1) / the impulse from block 3 again arrives at the control electrode T 1 management T 1 is reopened, and the process is repeated. I il.

 R is the resistance of the circuit consisting of the internal resistance of the tirkstor 1, the active resistances of the windings of the network transformer, the resistances of the Sj coils, 5- inductance and 2, the resistances of the diodes 6, - 6 3 and 7 - 7, through which the resistance of resistor B. flows.

The value of inductance L of (1) is

L.4L, .L54L ,,. 2)

de L Lg- winding inductance

mains transformer; L J is the inductance of the additional inductor 51 or Sj, through which current flows; (d) inductance of the first carcass, 2 carcasses. When t g expression (1) takes

view

..

l4 (.

(3)

where 3 is the amplitude value of the current.

The recharge current of the capacitor 4 (the polarity of the capacitor 4 at the time of opening the thyristor is indicated in Fig. 1) flowing through the loop: the first inductor 3, the capacitor 4, the thyristor 1, recharges the capacitor 4 with reverse polarity. In the second half-period of free oscillations of this circuit, the current changes its direction and flows through the thyristor 1 in the direction opposite to the current determined by the booster (1). The thyristor is locked at the moment when the current of this oscillating circuit exceeds the current value determined by the expression (3). At this moment, the current will go through the circuit: phase A, additional inductor 51, diode 6, resistor 8, capacitor 4, additional diode 7j, phase C, recharge capacitor 4. When capacitor 4 is charged with the polarity indicated on 1, the scheme comes to a steady state.

C values are chosen from

switching frequency

(five)

127)

After a time equal to or a multiple of t T, the impulse from control unit 3 of the control unit 3 again comes to the control electrode of the thyristor 1, the thyristor opens again and the process repeats.

Editor O. Bugir

, Compiled by A. Levitsk

Tehred O. Gortvay Proofreader L. Patay

Order 1725/59 Circulation 624 Subscription VNISHS of the USSR State Committee on Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

;

ten

12233814

Claims (1)

Invention Formula  A device for transmitting signals through wires of a three-phase electric transmission line, containing a series-connected thyristor and a first inductor, a point of connection. Which are connected to the first output of the anxiety unit, the second output of which is connected to the control electrode of the thyristor, as well as a capacitor, characterized in that, in order to expand the functional possibilities by transmitting signals in the incomplete-phase mode of the transmission line, phase after-. additionally connected inductance coil and diode, and tatase resistor and additional diodes, and the cathodes of the diodes are combined and connected through a resistor to the thyristor anode and the first capacitor plate, the second plate of which is connected to the second diode of the first inductor and the combined anodes of the additional diodes, the cathodes of each of which are connected to the wire of the corresponding phase 30 of the three-phase transmission line. fS 20 25