RU2643789C1 - Method of connecting the controlled shunting reactor (options) - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: invention refers to the electric power industry. New one is that a single rectifier is used in the magnetization circuit, which is fed from an independent network before being connected to the network. At the moment of switching, the current in the magnetization circuit remains due to the capacitor permanently connected or disconnected after the start-up.

EFFECT: simplifying and improving reliability.

2 cl, 2 dwg

Description

The invention relates to electrical engineering and is used in electric power systems.

The well-known / 1, 2, 3 / method of connecting a controlled shunt reactor (hereinafter - CSR) to the network and containing a storage capacitor in the DC circuit, which consists in the fact that before connecting the reactor to the network it is pre-magnetized using an independent power source due to the fact that two rectifiers are connected to the bias circuit. The use of two rectifiers significantly complicates the CSR circuit.

The technical result achieved in the invention is to simplify and increase reliability.

The technical result is achieved due to the fact that they use one thyristor rectifier in all modes, which is connected to an independent source at the start of start-up and the magnetization starting current is set, a command is sent to turn on the high-voltage circuit breaker of the CSR winding, disconnect its input from an independent power source and connect it to the winding of its own power supply, the CSR and, after the appearance of voltage, control the rectifier.

In the second embodiment of the invention, the technical result is achieved due to the fact that they use one thyristor rectifier in all modes, which is connected to an independent source at the start of start-up, a capacitor is connected to the bias circuit and the magnetization starting current is set, a command is sent to turn on the high-voltage circuit breaker of the CSR network winding, disconnect its input from an independent power source and connect it to the winding of its own power supply CSR and after the appearance of voltage control the rectifier and turn it off t capacitor.

In FIG. 1 and 2 shows a diagram for implementing the method, respectively, according to options. It contains: 1 - CSR, 2 - mains switch, 3 - main network, 4 - auxiliary, independent network, 5, 6 - own and independent power switches, 7 - thyristor controlled rectifier, 8 - controller, 9 - capacitor. In FIG. 2, in addition to the capacitor circuit 9, contact 10 of the auxiliary switch is introduced.

The CSR method of connecting a managed shunt reactor to the network is as follows. Management of all work is carried out by the controller 8, which gives commands, carries out regulatory actions, processes the signals of sensors and control devices. All additional connections that are not necessary to explain the connection process are not shown in the drawings. Before connecting the CSR to the network, it must be pre-magnetized in order to exclude overvoltage / 3 /. To do this, the switch 6 is closed, the rectifier 7 is connected to a relatively low voltage network (0.22-0.5 kV). In FIG. 2, a capacitor 9 is connected to the output of the rectifier, which in FIG. 1 is permanently connected. The controller 8 controls the rectifier 7, as a result of which a direct current appears at its output, which goes to magnetize the CSR 1 and the charge of the capacitor 9 (in dynamics). DC pulsations are limited by the internal resistance of source 4. After reaching the desired magnitude of the initial bias current, switch 6 opens and switches 5 and 2 turn on. The process of these switches is carried out quickly in 0.05-0.2 s. Since the time constant of the magnetization circuit of CSR 1 is tens of times larger, the current during the switching process decreases slightly due to its flowing through the capacitor 9. That is, all this time CSR 1 is in a magnetized state, which eliminates overvoltage when it is connected to the network 3 ( 35-500 kV). Rectifier 7 is powered by CSR 1. In FIG. 2 with delay for this time, the contact 10 is disconnected and the capacitor 9 is taken out of operation. Such an operation for connecting, disconnecting an additional capacitor 9 is used in circuits where the capacitor is not used in stationary operation or if a small permanently connected capacitor is used. Thus, the use of a single rectifier simplifies the CSR circuit and improves reliability.

Information sources

1. RF patent No. 2447529, cl. H01F 29/14, 2010.

2. RF patent No. 2473999.

3. The journal "Electro", 2012, No. 4, p. 37-41.

Claims (2)

1. The method of connecting a managed shunt reactor to the network and containing a storage capacitor in the DC circuit, which consists in the fact that before connecting the reactor to the network it is pre-magnetized using an independent power source, characterized in that they use one thyristor rectifier in all modes, which at the beginning of start-up, they are connected to an independent source and the starting magnetization current is set, a command is issued to turn on the high-voltage circuit breaker of the CSR network winding, the input t is turned off ristornogo rectifier from an independent power supply and connect it to the power of their own CSR winding and after the appearance of a voltage controlled thyristor rectifier. 2. A method of connecting a controlled shunt reactor to the network, which consists in the fact that before connecting the reactor to the network it is pre-magnetized using an independent power source, characterized in that they use one thyristor rectifier in all modes, which is connected to an independent source at the start of start-up, a capacitor is connected to the bias circuit and the bias starting current is set, a command is issued to turn on the high-voltage circuit breaker of the CSR network winding, the thyristor rectifier input is turned off It is connected with an independent power source and connected to the winding of its own power supply, and after the appearance of voltage, the thyristor rectifier is controlled and the capacitor is turned off.

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