RU1818659C - Device for lateral capacitive compensation of traction substation - Google Patents

Abstract

Usage: in the energy sector, in devices for lateral compensation of reactive power of traction substations. SUBSTANCE: device contains a capacitor bank split into two parts, in series with which a reactor is connected, a capacitor bank is connected to a bus of a 27.5 kV traction substation, on which a balancing transformer is installed, containing a second secondary winding connected to an incomplete star, and one of the vertices of the triangle are combined with the end of the corresponding phase of the winding of an incomplete star. One part of the capacitor bank is connected to the top of the triangle corresponding to the phase of the incomplete star, the other to one of the vertices of the incomplete star. In this case, the low-voltage leads of the battery parts are combined, connected to the reactor. 4 ill. ate with

Description

The invention relates to the field of electric power industry, in particular, to the design of devices for lateral compensation of reactive power of AC traction substations when using balancing transformers with Scott effect on them.

The aim of the invention is to develop a compensation device for traction substations with STTP, excluding the generation of negative sequence currents from these devices while reducing energy losses in reactors.

In FIG. 1 shows a connection diagram of the proposed lateral compensation device to STTP; in FIG. 2 - vector

diagram of currents and voltages of a traction substation with STTP; in FIG. 3 is a vector diagram of the formation of current flowing through the reactor of the apparatus of the invention; in FIG. 4 - formation of current reverse. Sequence (TOP) phase A in the presence of the proposed device of lateral compensation and the same loads to the left and right of the substation with STTP.

TOP from the traction load (I yes) and the proposed soft starter (1 CA2): 1

J A2 TJ (I l I p) CA2 (I ate I cf).

00

o o e o o

"-"and

where J and) n currents of the traction load on the left and

to the right of the traction substation; Iel and I Cn are the currents of the Cr and Cz batteries of the proposed soft starter. As follows from FIG. And, when the soft starter does not generate TOP, when traction the load also does not generate TOP. Therefore, under these conditions, the resulting

TOP} A2Ј 0,

Both batteries Ci and Cz of the device (Fig. 1) contain disconnectors 1, switches 3, 4, one of which is shunted by a resistor 5. Voltage transformers are connected in parallel to the capacitors 8 of the batteries 9. The capacitors are installed on platforms 7. A current transformer is used to protect the device 2, 11 and ground disconnectors 6. The reactor 10 is connected with one terminal to a common low-voltage battery C1 and Cz, and the second through the primary winding of current transformer 11 to the rails.

The device operates as follows ..

When the first battery Cg is connected to one of the vertices (at) of the secondary CTTP winding connected by a triangle, and the second battery Cz is connected to the second phase (in t) of the secondary CTTP winding connected by an incomplete star, both batteries with their second terminals are combined into a common low-voltage unit (a) between which the rails include a resonant reactor 10. Due to the fact that the second vertex of the secondary winding connected by a triangle is combined with the end of the corresponding phase of the winding of an incomplete star (terminals St and St) and% is connected to the rails, the angle between I ate currents I and J cn batteries Ci and Cr is 90 ° (Fig. 3)

and the current through the reactor J p is not equal to the arithmetic but to the geometric sum of the battery currents I Сл and J Sp, i.e. the resulting current is not equal to the sum of the battery currents1

1.41 of the current value of any of the batteries. Therefore, the energy loss in the reactor is reduced by half compared with the loss in the reactor of the prototype, when the capacity

The soft starter is turned on to the left or right of the traction substation. Compared with the energy loss in the FROM-35 reactor of the prototype, the energy saving is 0.5x40x8760 175200 kWh / year per device.

At the same time, the implementation of the invention allows to exclude the influence of the soft starter in this design on the TOP of the power substations, because these devices generate only direct sequence currents, which is clearly illustrated in Figs.

4 (FIG. J CA1).

Claims (1)

Claims Device for transverse capacitive compensation of a traction alternating current substation containing a transformer, the secondary winding of which is connected in a triangle, consisting of a capacitor bank and a reactor connected in series, connected between one of the vertices of the secondary winding triangle and the rails, further with the aim that To reduce the asymmetry of currents and voltages and to reduce power losses in the reactor, a transformer installed on a traction substation is balancing and contains a second secondary winding connected to a partial star in which one of the vertices of the triangle is combined with the end of the corresponding phase of the partial star winding and connected to the rails, a second capacitor bank is additionally introduced, connected to the second phase of an incomplete star, while the first capacitor bank is connected to the top of the triangle, corresponding to guide absent incomplete phase star, low voltage batteries are combined terminals, and a reactor is connected between the common point of the secondary windings and the combined battery terminals.  Ј CTT / 7 Lb and at / 7 VA  8 FIG. 2 Fi g L Editor A.Col yes Compiled by R. Mamoshine Tehred M. Morgenthal Corrector T.Vashkovich