SU1472306A1 - Arrangement for lateral capacitor compensator of a.c. substations - Google Patents

Abstract

The invention relates to devices for the power supply of the electrolift structure of the main railways. The purpose of the invention is to increase the reliability of the transverse capacitive compensation device. The device is designed as a passive linear two-pole device containing two magnetically connected reactors 3 and 4, one of the opposite terminals of which are connected to the terminal of the transformer winding 1 of the substation transformer to which the contact network 2 is connected. Other terminals of these reactors are through capacitors 5,6 and the adjustable capacitors 7 are interconnected and connected to another output of the traction winding 1. At the same time, the inductances of the reactors and the capacitors of the capacitors are selected from the condition of resonance voltage at frequency k harmonic ki circuit 3 in the reactor and provide the necessary capacitance two-terminal input resistance at the fundamental frequency of the traction current of electric rolling stock. Due to the counter-switching of reactors 3 and 4, the capacity of capacitor 5 is reduced. 1 sludge.

Description

1C

with

about

O5

The invention relates to devices for the power supply of an electric rolling stock of alternating current of main railways.

The aim of the invention is to increase the reliability of the transverse capacitive compensation device.

The drawing shows the electrical circuit of the proposed device. A contact network 2 and an input of a passive linear two-port network consisting of the first 3 and second 4 magnetically connected reactors connected by one opposite terminal and a passive linear two-pole port of the main harmonic of the rod are connected to one output of the transformer winding 1 of the substation transformer. W and the ability to control capacitive compensation at reduced voltage are determined from the equation

ZBX (OM +

((uLi + a) M-, 4--) (wL2-fcuM- -)

soy,

Yuse

o) L, -fo) (oL2-4-o) During normal operation of the device through capacitors B and 7, a significant part of the currents of higher harmonics practically does not leak, as they are closed along the circuit

giving inductances respectively from the main reactor 3 and the capacitor 5. LI, L2 and mutual inductance M. Another

the output of the main reactor 3 through one of the capacitors 5 with a capacity of Ci, and the output of the additional reactor 4 through the other capacitor 6 and adjustable capacitors 7, having capacities of C2H and C2P, respectively, are connected to the output winding 1.

The device works as follows.

In order to avoid the flow of the k-th harmonic of the traction loop through the adjustable capacitor bank 7, the capacitance Ci of the capacitor 5, selected from the voltage resonance condition for the k-th harmonic in the reactor circuit 3 taking into account the mutual inductance, is

f,. one

 sh (b, + m)

where (Ok-circular frequency of the k-th harmonic of the traction current. Values of inductance L2 of additional reactor 4 and equivalent capacitance of capacitors 6 and 7

With Cgn Cr

chosen from the condition of obtaining the necessary capacitive input impedance

20

25

Thereby, the reliability of operation of capacitors 6 and 7 is increased, and the possibility of regulating capacitive compensation at reduced voltage is provided.

Due to the on-switching of magnetic-coupled reactors 3 and 4, the capacitance Ci is reduced, which is necessary to create a voltage resonance in the device at the kth harmonic of the traction current.

Claims (1)

Invention Formula . A transverse capacitive compensation device for AC traction substations, containing a circuit of successively connected first reactors and one of the capacitors, connected to the leads of the substation transformer transformer, characterized in that it is equipped with a second reactor to increase reliability connected to the first reactor, and adjustable capacitors connected in series with another capacitor and the second reactor to a circuit connected to the terminals of the transformer winding of the substation. from the main reactor 3 and the condenser 5. Thereby, the reliability of operation of capacitors 6 and 7 is increased, and the possibility of regulating capacitive compensation at reduced voltage is provided. Due to the on-switching of magnetic-coupled reactors 3 and 4, the capacitance Ci is reduced, which is necessary to create a voltage resonance in the device at the kth harmonic of the traction current. Invention Formula . A transverse capacitive compensation device for AC traction substations containing a circuit of the first reactor connected in series and one of the capacitors connected to the leads of the transformer transformer of the substation, in order to increase reliability, it is equipped with a second reactor connected to the first reactor, and adjustable capacitors connected in series with another capacitor and the second reactor to a circuit connected to the terminals of the transformer winding of the substation.