RU136933U1 - INSTALLATION OF TRANSVERSE CAPACITIVE COMPENSATION OF REACTIVE POWER IN THE SYSTEM OF TRACED ELECTRIC SUPPLY OF AC - Google Patents

Abstract

Installation of transverse capacitive compensation of reactive power in an alternating current traction power supply system with two first and second sections connected in parallel, connected between a 27.5 kV bus and a rail, in each of which a single-phase circuit breaker with block contacts, a capacitor bank, a reactor and a starting resistor limiting surges of current and voltage when turning sections on and off, characterized in that a three-phase circuit breaker with block contacts is introduced, in which the first output of one phase PS is connected to the connection point of the reactor with the starting resistor of the first section, and the first terminal of the second phase is connected to the connection point of the reactor with the starting resistor of the second section, the second terminals of the first and second phases are connected to the rail, and the control unit with the on and off buttons “Off” of the second section, moreover: - a circuit from the first closed NO contact of the ON button of the second section and the first NO contact of the OFF button of the second section connected in parallel to the disconnection circuit of the three-phase switch is connected; the three-phase circuit breaker switching circuit includes the first closing block contact of the second-phase single-phase circuit breaker; - the circuit of the second-phase single-phase circuit breaker switching circuit includes a circuit from the second second closing contact of the ON button of the second section, the first closing block-contact of the first-phase single-phase circuit breaker and the first a disconnecting block contact of a three-phase circuit breaker; - a circuit from a series of connected second closing circuits is included in the circuit breaker circuit of the second section

Description

The utility model relates to traction power supply of electric railways of alternating current, in particular, to compensation of reactive power in traction networks of alternating current using transverse capacitive compensation (KU).

When KU is turned on and off, unwanted surges of current and voltage occur during the transition period, which leads to increased wear of the capacitors. To limit them, the KU circuit includes starting resistors [1, 2, 3, 4], which significantly reduce the inrush current and voltage.

In the utility model, a two-stage KU with two sections and a second section that is switched off when controlling the power of the KU is considered. The first stage of power KU works when you turn on the first section. The second stage of power KU works when you turn on the first and second sections.

We take as a prototype a utility model [4]: Installation of transverse capacitive compensation in an alternating current traction power supply system with two parallel first and second sections connected between a 27.5 kV bus and a rail, in each of which a single-phase switch with block contacts is connected in series , a capacitor bank, a reactor and a starting resistor, limiting surges of current and voltage when the section is turned on and off.

The lack of prototype. When KU is put into normal operation, starting resistors in the first and second sections are shunted during its switching on, and each resistor is shunted by an individual 10 kV switch. Since the domestic industry mass-produces three-phase switches [5], they use two three-phase switches. It is known [3, 4] that in a two-stage switchgear during switching (on-off) of the second section, it is necessary to operate simultaneously with two shunt switches of the starting resistors. Therefore, it is logical to use one instead of two bypass switches.

The purpose of the utility model is to simplify the circuit of a two-stage switchgear by reducing the number of three-phase switches. Instead of two three-phase circuit breakers, it is proposed to use one three-phase circuit breaker without changing the circuit technology.

For this, a three-phase switch with block contacts is introduced, in which the first terminal of one phase is connected to the connection point of the reactor with the starting resistor of the first section, and the first terminal of the second phase is connected to the connecting point of the reactor with the starting resistor of the second section, the second terminals of the first and second phases are connected with a rail, and a control unit with on / off and off buttons of the second section, moreover:

- a circuit from the first connected make contact of the on button of the second section and the first make contact of the disconnect button of the off section of the second section is included in the trip circuit of the three-phase switch;

- a circuit from a parallel-connected make-up block contact of a single-phase switch of the second section and series-connected second make-up block-contact of a single-phase switch of the first section and a disconnect block contact of a single-phase switch of the second section is included in the circuit of the three-phase switch;

- a circuit from a series-connected second make contact of the ON button of the second section, a first make contact block contact of a single-phase switch of the first section and a first disconnect block contact of a three-phase switch is included in the circuit of the single-phase switch of the second section;

- in the circuit for disconnecting a single-phase circuit breaker of the second section, a circuit is connected from the second closing contact of the disconnect button "Off" of the second section and the second opening block contact of the three-phase circuit breaker connected in series.

The installation of transverse capacitive compensation is shown in the figure, which shows:

1 - bus 27.5 kV.

2 - rails.

3, 4 - the first and second sections of the KU.

5, 6 - single-phase switches of the first and second sections of the KU.

7, 8 - capacitor banks of the first and second sections of the KU.

9, 10 - reactors of the first and second sections of the KU.

11, 12 - starting resistors of the first and second sections of the KU.

13 - three-phase switch.

14 - control unit of the second section KU.

15, 16 - the first and second make contacts of the "On" button to enable the second section of the control unit.

17, 18 - the first and second make contacts of the “Off” button to disable the second section of the control unit.

19, 20 - the first and second closing block contacts of a single-phase switch of the first section of the KU.

21, 22 - the first and second opening block contacts of the three-phase switch.

23 - closing block contact of a single-phase switch of the second section of the KU.

24 - NC blocking contact single-phase switch of the second section of the KU.

All switches are vacuum operated. All block contacts of the circuit breakers are delayed by operation (with a time of about 0.1 sec). In the utility model, we accept: the first section is constantly on, and the second section is designed to control the power of the KU, which is turned on or off depending on the mode.

The utility model works as follows. The initial position of the KU steps: the first section 3 is on (single-phase switch 5 and the three-phase switch 13 are on), the second section 4 is off (single-phase switch 6 is off).

When a turn-on command “On” of the second KU section is issued, the switches are switched by the control unit 14 in the following sequence:

- The three-phase switch 13 is disconnected along the circuit with the first make contact 15 of the “On” button of the second section 4 of the control unit. Thus, the starting resistor 11 is introduced into the power circuit of the first section 3 KU, and the starting resistor 12 - into the power circuit of the second section 4 KU.

- The three-phase switch 6 of the second KU section 4 is turned on by a circuit with the second closing contact 16 of the On button of the second KU section 4 connected in series, the first closing block contact 19 of the single-phase switch 5 of the first KU section 3 and the first opening block contact 21 of the three-phase switch 13 .

- The three-phase switch 13 is turned on by a circuit with a closing block contact 23 of the single-phase switch 6 of the second section 4 of the control unit.

When the shutdown command “Off” of the second section 4 of the control unit is issued, the switches are switched by the control unit 14 of the second section 4 of the control unit in the following sequence:

- The three-phase switch 13 is disconnected along the circuit with the first make contact 17 of the "Off" button of the second section 4 of the control unit. Thus, the starting resistor 11 is introduced into the power circuit of the first section 3 KU, and the starting resistor 12 - into the power circuit of the second section 4 KU.

- The single-phase switch 6 of the second section 4 of the switchgear is disconnected by a chain of series-connected second make contact 18 of the “Off” button of the second section 4 of the switchgear and the second disconnect block contact 22 of the three-phase switch 13.

- The three-phase switch 13 is turned on by a chain of series-connected second make contact 20 of the single-phase switch 5 of the first section 3 of the KU and the disconnect block contact 24 of the single-phase switch 6 of the second section of the 4 KU.

The technical and economic effect is determined by the simplification of the design of the KU by reducing the number of switches for shunt starting resistors - using one three-phase switch instead of two.

Information sources

1. Borodulin BM, German LA, Nikolaev G. A. Condenser installations of electrified railways. - M .: Transport, 1983. - 183 s

2. German L. A., Serebryakov A. S. Adjustable capacitive compensation units in traction power supply systems of railways: monograph / Monograph - M. MIIT, 2012. - 211 p.

3. German L.A., Serebryakov A.S. Adjustable lateral capacitive compensation for traction AC networks. Electro, No. 6 - 2009, p. 29-36

4. Utility model No. 1033330 Installation of transverse capacitive compensation in the traction power supply system of alternating current (authors German L.A., Serebryakov A.S., Kvashchuk V.A.). Application No.2010144666 dated 01/01/2010. Publ. 04/10/2011

5. Power equipment of traction substations of railways (collection of reference materials). Russian Railways, a branch of the PKB for Electrification of Railways - M .: Transizdat, 2004 - 384 s

Claims (1)

Installation of transverse capacitive compensation of reactive power in an alternating current traction power supply system with two first and second sections connected in parallel, connected between a 27.5 kV bus and a rail, in each of which a single-phase circuit breaker with block contacts, a capacitor bank, a reactor and a starting resistor limiting surges of current and voltage when turning sections on and off, characterized in that a three-phase circuit breaker with block contacts is introduced, in which the first output of one phase PS is connected to the connection point of the reactor with the starting resistor of the first section, and the first terminal of the second phase is connected to the connection point of the reactor with the starting resistor of the second section, the second terminals of the first and second phases are connected to the rail, and the control unit with the on and off buttons Off "the second section, moreover: - a circuit is connected to the tripping circuit of the three-phase circuit breaker from the first closed making contact of the on button of the second section and the first making contact of the disconnecting button of the second section; - the first closing block contact of the single-phase switch of the second stage is included in the switching circuit of the three-phase switch; - the circuit of the second section of the second closing contact of the ON button of the second section, the first closing block contact of the first-phase switch of the first stage and the first opening block contact of the three-phase switch is connected to the circuit of the single-phase switch of the second section; - a circuit from a series-connected second make contact of the disconnect button "Off" of the second stage and a second disconnect block contact of a three-phase switch is included in the trip circuit of the circuit breaker of the second section.

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