RU101844U1 - AC POSITION SECTION POST - Google Patents

Abstract

 Sectionalization section of the AC contact network, containing contactor feeder circuit breakers connected to the sectioning station bus, their control units with relay-followers of the disconnected state of the switches and latching relays, four voltage transformers, the primary windings of which are connected to the circuit breakers from the side of the contact network, characterized in that a short circuit control unit (UKKZ) has been introduced, two switches of four circuits of series-connected make-up contacts of the relay-repeaters are disconnected state of the switches and the latching relay, a transitional transformer with four primary and one secondary windings, each primary winding of which is connected to the secondary winding of the voltage transformer through one circuit of the first switch, and one secondary winding is connected to the input of the UKKZ, the output contact of the UKKZ is connected to plus ”to the power supply bus, and the other end to the combined first terminals of the parallel connected circuits of the second switch, the second terminals of the circuits of the second switch are connected to the blocks switch boards.

Description

The device relates to a system for automating the power supply of electric railways of alternating current, and in particular to sectioning posts with automatic restarting of feeders of contactors of the contact AC network of railways.

The section of the AC contact section, contains the contact network feeder switches connected to the section post bus, their control units with the relay-followers of the disconnected state of the switches and the latching relay, four voltage transformers, the primary windings of which are connected to the switches from the side of the contact network [1, p. 38, fig. 2].

The disadvantage of sectioning post in the absence of a short circuit monitoring device (UKKZ) in the contact network [1]. Currently, UKKZ are installed only on feeders of the contact network of traction substations. However, the inclusion of UKPO at sectioning posts has several advantages.

In accordance with the project, automatic reconnection (AR) of the feeders of the contact network of the sectioning station occurs only when there is counter voltage, that is, after the feeder of the contact network is turned on at the substation ..

For this

- all feeders of the contact network of the factory-built sectioning station, in particular, according to the developments of NIIEFA-ENERGO [2], already have voltage transformers (for this there is a design development)

- voltage transformers with UKKZ must be additionally installed on feeders of the contact network of traction substations (unfortunately, there is no design development for installing TN-27.5kV on feeders of the contact network of traction substations).

According to the proposed utility model, there is no need to install additional voltage transformers at traction substations.

An automatic reclosure device with a UKKZ should be performed at the sectioning station, and at the substation, turn on the feeder with an energy dispatcher for telecontrol (of course, with the feeders turned on at the sectioning station).

Thus, the inclusion of UKPZ at the sectioning station (PS) is advisable for the following reasons:

1 The inclusion of UKKZ on the feeders of the contact network of the sectioning post allows automatic reclosure to be carried out only when passing short-circuit, which will increase the reliability of the PS.

2. According to the project, the sectioning posts are already equipped with voltage transformers, therefore, for the implementation of the UKKZ at the sectioning station, it is enough to turn on only the UKKZ unit (recall that voltage transformers must also be installed at the substation).

3. Turning on the feeders of the contact network of the sectioning station’s reclosure from the automatic reclosure with UKKZ with a minimum time delay (0.5 sec) [1] allows you to quickly bypass open air gaps at the sectioning station, which eliminates damage to the air gaps when colliding with the EPS, and this increases reliability of substations and, in general, power supply.

4. At the sectioning post, you can install only one UKKZ device for controlling the UAV on all feeders of the contact network

The purpose of the utility model is to increase the reliability of the PS.

This goal is realized by the fact that a short-circuit control unit, two switches of four circuits of series-connected make-up contacts of the relay-repeaters of the disconnected state of the circuit breakers and the latching relay, a transitional transformer with four primary and one secondary windings, each primary winding of which is connected to the secondary winding of the transformer, are introduced voltage through one circuit of the first switch, and one secondary winding is connected to the input UKKZ, output contact UKKZ one end connected to A “plus” to the power supply bus, and the other end to the combined first terminals of the parallel connected circuits of the second switch, the second conclusions of the second switch circuits are connected to the control units of the feeders of the contact network feeders.

In other words, for the introduction of the UAV from UKKZ to the substation, it is enough to mount one set of UKKZ for the UAV on all feeders of the contact network of the sectioning station.

The scheme of the utility model is shown in the figure. The diagram shows:

1 - post sectioning of the contact network 27.5 kV.

2, 3, 4, 5 - contact feeder circuit breakers.

6, 7, 8, 9 - control units for circuit breakers, respectively 2, 3, 4, 5.

10 - bus post sectioning.

11, 12, 13, 14 - voltage transformers TN-27.5 kV.

15, 16 - the first and second switches with four circuits of series-connected contacts of the relay-repeaters of the disconnected state of switches 2, 3, 4, 5 with the contacts of the relay of fixation of the same switches.

17, 19 - make contact relay repeater off state of the switch 4, respectively, of the first and second switch.

18, 20 - the closing contact of the latching relay, respectively, of the first and second switch of the same switch 4.

21 - intermediate transformer.

22 - short circuit monitoring device (UKKZ).

23 - output closing contact UKKZ.

24 - "plus" of the operational power source.

The utility model works as follows.

In the event of a short circuit (short circuit) on the contact network, the corresponding feeder, for example, feeder 4, is disconnected. The contacts 17, 18, and 19, 20 are closed in the circuits of the first (15) and second 16 switches. The residual voltage of the contact network is supplied through voltage transformer 13, contacts 17 and 18 of the first switch 15 and the transition transformer 21 to the unit UKKZ 22.

If the fault is passing, then the UKKZ (22) is activated, the output contact 23 closes and a control command is sent from the “plus” power supply 24 through contacts 19 and 20 of the second switch 16 to the control unit 8 of switch 4 to turn it on by automatic reclosure.

The technical and economic effect of the utility model is to reduce current costs by increasing the reliability of the sectioning station. In addition, the saving of capital costs when introducing an automatic reclosure with a short-circuit monitoring device is determined by the fact that there is no need to install voltage transformers and one UKKZ device is mounted on four feeders instead of four.

Information sources

1. German L.A., Selyakin B.C. Automation in emergency situations of AC traction network. Electronics and electrical equipment of transport No. 2-3, 2010, p. 37-44 (prototype - Fig. 2).

2. Marikin A.N., Mizintsev A.V. New technologies in the construction and reconstruction of traction substations. M .: GOU "Educational and methodological center for education in railway transport", 2008. - 220 s

Claims (1)

Sectionalization section of the AC contact network, containing contactor feeder circuit breakers connected to the sectioning station bus, their control units with relay-followers of the disconnected state of the switches and latching relays, four voltage transformers, the primary windings of which are connected to the circuit breakers from the side of the contact network, characterized in that a short circuit control unit (UKKZ) has been introduced, two switches of four circuits of series-connected make-up contacts of the relay-repeaters are disconnected state of switches and latching relays, a transitional transformer with four primary and one secondary windings, each primary winding of which is connected to the secondary winding of the voltage transformer through one circuit of the first switch, and one secondary winding is connected to the input of the UKKZ, the output contact of the UKKZ is connected to plus ”to the power supply bus, and the other end to the combined first terminals of the parallel connected circuits of the second switch, the second terminals of the circuits of the second switch are connected to the blocks switch boards.