RU156426U1 - AC SECTION POST WITH INSTALLATION OF LONGITUDINAL COMPENSATION - Google Patents

Abstract

An AC sectioning station comprising high-voltage switches for connecting the contact network and a sectional switch, measuring transformers for connecting currents and voltage transformers, characterized in that the station includes a longitudinal compensation unit connected to the buses of the sectioning station parallel to the sectional switch of the station using high-voltage switches, including measuring transformers current and automatic control circuit of the device in normal and emergency modes using the existing measuring voltage transformers and relay protection of the station, containing the closing contacts of the intermediate relays of the connections of the station and the installation of longitudinal compensation connected on the one hand to the control bus +110 V, and on the other hand to the intermediate relay connected to the -110 V bus the contact of which supplies a voltage of +110 V to turn off the high-voltage switches of the longitudinal compensation unit, the closing contacts of the voltage relay connected on the one hand to the +110 V bus, and on the other hand to an intermediate relay connected to the -110 V bus, the make contact of which supplies voltage from the +110 V control bus to turn on the sectional switch of the sectioning post, the disconnecting block contacts of the high-voltage connection switches connected in series-parallel, supplying +110 V to the time relay, the make contacts of which, through the make contacts of the voltage relay, supply a voltage of +110 V to the intermediate relay, whose make contacts supply voltage to disconnect the sectional switch of the section post

Description

The utility model relates to traction power supply systems, in particular to a traction power supply system of a railway vehicle, in particular to a section of a section of a contact alternating current network.

The purpose of the utility model is to compensate for voltage losses in the contact AC network with an increase in traction loads and to provide the required level of reliability of the sectioning station.

Sectioning posts in AC sections are designed to increase the reliability of power supply in emergency conditions, as well as to reduce electricity losses in double and multi-track sections by organizing nodal power circuits for the contact network.

The use of reactive power longitudinal compensation (CCA) installations is associated with the need to solve the problem of compensating voltage losses in the contact network due to traction load. The most effective way to enable the CPC in areas with two-way power is to include a traction substation in the suction line. In some cases, on sections of railways with traction power supply systems of alternating current, cantilever power circuits are used, in which CPC are used at sectioning posts to ensure the voltage mode in the contact network, both at the beginning of the power zone (limiting the maximum allowable voltage level), and sectioning post (maintaining a minimum voltage level). To improve the reliability of the power supply of the contact network behind the sectioning station, a circuit for switching the CPC to the tires of the sectioning station is proposed.

A device is known - a section of a contact network containing high-voltage equipment, control equipment, current sensors, a unit for determining the direction of current, a block of settings for relay protection and an executive unit [1]. This device is used in traction power supply systems of direct current.

Closest to the claimed device is a post AC section with the installation of transverse capacitive compensation [2]. Connection of the transverse capacitive compensation installation is carried out to the post buses through a high-voltage switch, with the help of which it is possible to turn off the installation for a short time to determine the presence of a short circuit in the contact network.

The disadvantage of this device post sectioning is:

1) the lack of installation of longitudinal compensation of reactive power to maintain the voltage level in the console power circuits of the contact network;

2) the inability to connect the installation of longitudinal compensation;

3) the absence of a control scheme for the installation of longitudinal compensation in normal and emergency modes.

One of the advantages of using the UPK at the AC sectioning station is the possibility of increasing the voltage in the contact network in various modes, including at the end of the inter-substation zone with console power. The operating mode of the CPC is determined depending on the level of traction load.

The technical result achieved thanks to the claimed device is as follows:

1) the possibility of increasing the voltage in the contact network in the middle of the inter-substation zone with an increase in traction load;

2) improving the reliability of the operation of the CCP at the sectioning post in normal and emergency modes by implementing the connection of the CCP parallel to the sectional switch of the post using switches;

3) control of the operating mode of the control system in automatic mode, depending on the level of load and voltage on the tires of the sectioning station.

The claimed results are achieved due to the fact that the CCP allows you to compensate for voltage losses in the contact network in automatic mode and to increase the reliability of power supply to the contact network by automatically controlling the CCP in normal and emergency modes. The block diagram of the proposed device is presented in FIG. one.

The AC sectioning station consists of high-voltage circuit breakers 1-4, a sectional switch 5, current transformers 8-11, connection points and voltage transformers 14 and 15 (Fig. 1). The CPC 17 is connected to the tires of the sectioning station 16 through the high-voltage switches 6 and 7. Current transformers 12 and 13 are designed to protect the CPC in case of equipment damage. In normal mode, the high-voltage switches 5-7 are turned on, the control switch is shunted by the section 5 circuit breaker. When the voltage on the section busbars decreases, the sectional switch 5 is turned off, and the switches 6 and 7 remain on, providing traction power overload through the control panel. When the voltage on the tires of the sectioning post rises above the set value, the CPC is bypassed by turning on the sectional switch 5. When an emergency condition occurs in the contact network with switches 6 and 7, the CPC 17 is turned off. The UPC is turned on after the localization of the damage by turning off the corresponding switch of the contact network connections (1-4) with deceleration in the presence of a set voltage level on the section post tires.

In the control circuit of the sectioning post, a control circuit operating mode control unit is introduced (Fig. 2), which includes contacts of the intermediate relays of the post 18-21 connected on the one hand to the +110 V control bus, and on the other hand to the intermediate relay connected to the bus - 110 V, the closing contact of which supplies a voltage of +110 V to turn off the high-voltage circuit breakers of the longitudinal compensation unit, the closing contacts of the voltage relay connected on the one hand to the +110 V bus, and on the other hand to the intermediate relay connected to the -110 V bus, the contacting contact of which supplies voltage from the control bus +110 V to turn on the sectional switch of the sectioning post, the opening block contacts of the high-voltage connection switches connected in series, supplying voltage +110 V to the time relay, the closing contacts of which through the closing contacts of the voltage relay supply voltage +110 V to the intermediate relay, whose make contacts apply voltage to the section section switch of the sectioning switch. 5. Protection and control of circuit breakers K is carried out using a differential current relay (pin 22) connected to the windings of current transformers 12-13, providing a signal to shutdown the UPC in emergency mode through an intermediate relay (contacts 23-24), a voltage relay (contacts 25-26 and 35- 36) connected to the measuring transformers 14 and 15, the intermediate relay 27 (contacts 28), which enables the sectional switch 5 to be switched on, the block contacts 29-30 and 31-32 of the section post switches 1-2 and 3-4, respectively, the time relay 33 (pins 34) and intermediate e 37-38, provides power to the switch-CPC signal.

We consider the operation of the circuit using an example implementation. In normal mode, the high-voltage circuit breakers of the sectioning station 1-5 and the circuit breakers of the station 6-7 are turned on. When the voltage level on the tires of the sectioning post is lowered to the voltage set from the action of the relay (contacts 35-36), the sectional switch of station 5 is disconnected - CPC 17 is put into operation. The activation of the control code 17 is carried out with deceleration (contacts of the time relay 34), in order to avoid switching on the control code for a short circuit in the contact network when assembling the section section, if there is at least one pair of circuit breakers from groups 1-2 and 3-4, using an intermediate relay 37.

When the voltage level on the tires of the sectioning post rises due to the action of the voltage relay (contacts 25 or 26), an intermediate relay 27 supplies a signal to turn on the sectional switch of the post 5 for shunting the UPC.

In the event of an emergency mode in the contact network from the action of relay protection of the post (relay contacts 18-21) or differential current relay (contacts 22), if the CPC equipment is damaged, a signal is sent to turn off switches 6 and 7, the CPC is taken out of operation.

Bibliographic list

1. Pat. for invention 2139203 of the Russian Federation. IPC V60M 1/00. Contact network sectioning post / C.X. Darchiev, V.N. Pupynin, V.L. Soldatov, A.A. Tsernant. (RF) - No. 97122070/28; Declared December 29, 1997; publ. 10/10/1999.

2. Pat. for the invention of 2,352,478 of the Russian Federation. IPC B60M 3/02, H02J 3/18. Section post for contact AC network with transverse capacitive compensation / L.A. German, V.N. Pupynin. (RF) - No.2008101023 / 09; Announced January 18, 2008; publ. 04/20/2009. Bull. No. 11.

Claims (1)

An AC sectioning station comprising high-voltage switches for connecting the contact network and a sectional switch, measuring transformers for connecting currents and voltage transformers, characterized in that the station includes a longitudinal compensation unit connected to the buses of the sectioning station parallel to the sectional switch of the station using high-voltage switches, including measuring transformers current and automatic control circuit of the device in normal and emergency modes using the existing measuring voltage transformers and relay protection of the station, containing the closing contacts of the intermediate relays of the connections of the station and the installation of longitudinal compensation connected on the one hand to the control bus +110 V, and on the other hand to the intermediate relay connected to the -110 V bus the contact of which supplies a voltage of +110 V to turn off the high-voltage switches of the longitudinal compensation unit, the closing contacts of the voltage relay connected on the one hand to the +110 V bus, and on the other hand to an intermediate relay connected to the -110 V bus, the make contact of which supplies voltage from the +110 V control bus to turn on the sectional switch of the sectioning post, the disconnecting block contacts of the high-voltage connection switches connected in series-parallel, supplying +110 V to the time relay, the make contacts of which, through the make contacts of the voltage relay, supply a voltage of +110 V to the intermediate relay, whose make contacts supply voltage to disconnect the sectional switch of the section post nivations.

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