SU1643229A1 - Device for decreasing a.c. traction network circulating current - Google Patents

Abstract

This invention relates to the power supply of electrified AC railways. The purpose of the invention is to improve the energy performance and simplify the device. The device consists of two sets installed at substations A and B. At substation A, voltage is modulated, and at substation B, out of phase. The device contains current sensors 1, voltage sensors 2, current phase sensors 3, unit 5 comparing voltage modules, unit 7 for controlling voltage modules, unit 8 for comparing voltage phases of substations, unit 9 for controlling phase voltage, delay unit 12 , blocks 13 and 6 of resolution for transmission of information about the phase and voltage respectively, blocks 11 and 14 of the error between voltage and phase, respectively, phase controller 10. The voltages at the adjacent substations are compared and adjusted both in absolute value and in the angle between the vectors of these voltages by stepwise regulation. 1 hp ff, 2 ill. i (П С

Description

unit 7 substation in this way. 45, by the voltage mismatch unit. Thus, the functional operation of the device can be described by the following sequence: comparison of the modules of the voltage Id and Ug; getting

A), a phase mismatch unit and a phase regulator, with the voltage mismatch block being connected to the inputs of the modulus of the resolution module for voltage control, and output through the substation terminal A; the prohibition of the transfer of information about the voltage mismatch of the UA and U voltages in phase; alignment of voltage levels UA and U6 and permitting thereafter to transmit information about the phase of voltage U comparing the phase of voltages 11e and U and, if necessary, issuing a command to control the phase; the alignment of the delay unit and the first permission block for transmitting voltage information to the enable input of the first permission block for the transmission of the phase information, to the second input of which a signal is sent from the phase sensor, and its output is connected to the input of the communication channel, phase mismatch unit is connected with both of its inputs

, With a phase mismatch block and a phase regulator, the voltage mismatch block with inputs being connected to the inputs of the comparison block, the modular delay block and the first block for transmitting voltage information to the enable input of the first block for transmitting information about the phase, the second input of which is fed to the signal from the phase sensor, and its output is connected to the input of the communication channel, the phase difference unit is connected by both of its inputs

parallel to the inputs of the comparison unit fa, and the output through the second delay block and the second permission block for transmitting voltage information is connected to the enable input of the second resolution block for transmitting phase information, to the other input of which the signal from the voltage sensor is fed and the output Ph is connected to the phase regulator via a phase control unit.

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2. The device according to claim 1, wherein the phase regulator is designed as a power traction transformer with a voltage switch under load on the high voltage side, the control winding of the transformer being connected to the main winding with vector shift voltage in the main and control windings 120el.grad.

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Claims (2)

Claim 1. A device for reducing surge currents in an AC electric traction network, comprising current, voltage and phase sensors 20 installed on two adjacent traction substations, the outputs of the current sensors and one output of the voltage sensors connected to phase sensors, other outputs of the voltage sensors 25 through the channel communications are connected to the voltage module comparison unit, the output of which is connected to the input of the voltage regulation unit under the load of the power transformer installed on one of the substations, and the outputs of the phase sensors through connection connected to the input of the phase comparator channel Yield of which is connected to the input voltage phase adjustment unit installed 35 40 at another substation, characterized in that, in order to improve energy performance and simplify the device, it is equipped with a delay unit, a permission block for transmitting voltage information, a block for permitting the transmission of phase information installed on each of the adjacent substations, a mismatch unit phase and phase regulator, and the voltage mismatch unit with inputs connected to the inputs of the comparison unit modular delay unit and the first permission block for transmitting voltage information to the enable input of the first block permission to transmit. phase information, to the second input of which a signal is supplied from the phase sensor, and its output is connected to the input of the communication channel, the phase mismatch unit is connected by both of its inputs 1643229 parallel to the inputs of the comparison unit, the phases, and the output through the second delay unit and the second permission unit for transmitting voltage information is connected to the enable input of the second permission unit for transmitting phase information, to the other input of which a signal is supplied from the voltage sensor, and the output phase comparison unit | through the phase control unit is connected to the phase regulator. 2. The device according to π. 1, 'characterized in that the phase regulator is made in the form of a power traction transformer with a voltage selector under load on the high voltage side, and the regulating winding of the transformer is connected to the main winding, with a shift of the voltage vectors in the main and adjusting windings by 120 el. Kont-vod. Neutral Snake / Cont. b. Rails