RU2499341C1 - Filtration and compensation device of traction ac energy system - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: filtration and compensation device of a traction energy system comprises serially connected the main switch with a closing auxiliary contact and a control panel for its connection, the first reactor and the first section of capacitors, the second section of capacitors with the parallel connected second reactor, and the third section of capacitors with the third reactor and a damping resistor connected between a point of connection of the second and third sections of capacitors and the rail. The device design includes a contactor with a drive connected between the third reactor and the rail, and the circuit of contactor connection connects the control panel with its drive via the closing auxiliary contact of the main switch.

EFFECT: increased efficiency of current surge reduction and voltage with simultaneous device simplification.

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Description

The invention relates to the electric power industry, in particular, to filtration and compensation devices (UFC) in a traction AC network of a system of 25 kV and 2 × 25 kV.

A device for filtering and compensating for a traction power supply system of alternating current, developed at NIIEFA-ENERGO [1, Fig. 1, a; 2]. The device has two 80 Ohm resistors: one resistor for damping current and voltage surges when the UVC is turned on, and the second constantly on - for damping harmonic amplification due to the resonance between the capacitance and inductance of the contact network.

The purpose of the invention is to simplify the device by turning on the switch in the reactor circuit and eliminating one damping resistor together with its high-voltage switch. In this case, the functions of the prototype remain unchanged.

In the circuit according to [1, Fig. 1, b] proposed by the West Siberian Railway Power Supply Service, one resistor is also eliminated, however, in this circuit there is no second function of the NIIEFA-ENERGO circuit - there is no damping of harmonic amplification in the traction network.

We take for the prototype the scheme of the UFK NIIEFA-ENRGO [1, Fig. 1, a].

We consider a filtering and compensation device (UFC) of an alternating current traction power supply system that contains a main switch in series with a closing contact block and a control panel to turn it on, a first reactor, a first section of capacitors, a second section of capacitors with a second reactor connected in parallel, and a third section of capacitors with a third reactor, and a damping resistor connected between the connection point of the second and third capacitors section and the rail.

To achieve the objective of the invention, a contactor with a drive is introduced in series with the third reactor, which is connected between the third reactor and the rail, and the contactor switching circuit connects the control panel to its drive through the closing block contact of the main switch.

As a result:

1. In the circuit, there remains one damping resistor that performs two functions: damping current and voltage surges when the voltage is switched on and damping amplification of current harmonics in the traction network

2. The high-voltage switch 27.5 kV is eliminated, instead of which a contactor is installed (its rated voltage is 10 kV).

The device diagram is presented in the figure with the following notation:

1 - main switch;

2 - the first reactor;

3 - the first section of the capacitors;

4 - the second section of capacitors;

5 - the second reactor;

6 - the third section of the capacitors;

7 - the third reactor;

8 - damping resistor;

9 - contactor;

10 - control panel to turn on the UVC with the ON button;

11 - closing block contact of the main switch;

12 - rail;

13 - circuit to turn on the main switch;

14 - circuit for switching on the contactor;

The scheme works as follows.

Initial state of UFK: main switch 1 and contactor 9 are disconnected.

To turn on the UVC from the control panel 10, an ON command is sent to turn on the main switch 1 through the circuit 13 of the main switch 1. In this case, the UVC will turn on to the damping resistor 8, since the serial circuit of the third section of capacitors 6 and the third reactor 7 is broken by a disconnected contactor 9.

Further, after the closing of the closing block contact 11 of the main switch 1 through circuit 14, the contactor 9 will turn on. The current and voltage surges when the contactor 9 is turned on in the circuit 6-7-8-9 do not exceed the permissible values, as the calculations showed, due to the presence of damping resistor circuit 8.

The UFC disconnection process usually occurs: the main switch 1 is turned off. Since the vacuum circuit breaker is adopted as the main circuit breaker, the process of disconnecting the capacitive current will occur reliably, without repeated breakdowns of the vacuum chamber

The proposed circuit has an advantage in reducing current and voltage surges in comparison with the traction power supply circuit adopted in practice for a series connection of a reactor with a damping resistor [3].

In addition, the proposed circuit allows you to use one damping resistor (instead of, as usual - two) and use when you turn on a cheaper and more reliable vacuum contactor, which has twice as much mechanical resource.

Literature

1. Cheremisin V.T., Kvashchuk V.A., Brenkov S.N. Two-resonance filter compensating devices of electrified railways. Science and transport. Modernization of railway transport / 2008. Appendix to the journal “Transport of the Russian Federation. Journal of Science, Economics, and Practice, St. Petersburg, p. 48-51.

2. NIIEFA-ENERGO. Filtering device and reactive power compensation for contact AC network voltage of 27.5 kV. Advertising bureau "DiO", 2008

3. Borodulin B. M., German L. A., Nikolaev G. A. Condenser installations of electrified railways. - M.: Transport, 1983.-183 p.

Claims (1)

A device for filtering and compensating an AC traction power supply system, comprising a main switch in series with a closing block contact and a control panel for turning it on, a first reactor, a first section of capacitors, a second section of capacitors with a second reactor connected in parallel, a third section of capacitors with a third reactor, and a damping resistor connected between the connection point of the second and third section of the capacitors and the rail, characterized in that a contactor with vodom third reactor in series, which is connected between the third reactor and the rail, and the circuit switching contactor connects the control panel with its drive-through locking block contact of the main switch.