SU1395532A1 - Apparatus for detecting the place of flaw in traction network with automatic transformers of electric railway - Google Patents

Abstract

The invention relates to a protection system for a traction network with auto-transformers. The purpose of the invention is improving the accuracy of determining the location of damage. The device contains connected to each other, input i resistance sensor 1, a recording device 2, current transformers 3, 4, current relay 5,6,7,8, logic unit 9, alarm unit 10 and communication lines 11, 12 The information on the input impedance (Z) measured at substation 15 by the input impedance sensor 1, and information about the state or failure of the current relay 5-8 at autotransformers 22, 23, processed by the logic unit 9 and fixed by the alarm unit 10, is uniquely determined There is a place of damage in the traction section. ty 16. 3 ill. 5 1 tab. (L

Description

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The invention relates to railway transport and can be used in devices for the protection and automation of a traction network in an AC power supply system with autotransformers.

The purpose of the invention is the accuracy of determining the location of damage,

1 shows a block diagram of the device; FIG. 2 is a diagram of a traction network with autotransformers; Fig. 3 shows curves of the input short-circuit resistance (Z) and currents (I) in the output pins of the autotransformer midpoints on the distance between the substation and the fault site.

  The device (Fig. 1) contains interconnected input resistance sensor 1, a recording device 2, current transformers 3 and 4, a current relay 5-8, a logic unit 9, an alarm unit 10 and communication lines 11 and 12. to the inputs of the sensor 1 input no. The secondary windings of the transformer 13 of the voltage and the transformer 14 of the current are connected to the traction substation 15. Primary

current at autotransformers, processed by logic block 9 and fixed by alarm block 10,

The location of damage in the traction network 16 is identified.

The device works as follows.

Relay Actuation Settings 5-8

are selected as follows (FIG. 3): value 1; is taken to be equal to the current in circuit 20 with ,, corresponding to Z c, o (ke, I y, - equal to the current in circuit 20 at the location of the fault location at the autotransformer 23; 1., - equal to the current in circuit 21 with corresponding km V8 equal to the current in circuit 21 at the location of the damage site at the autotransformer 22, With such

selecting the relay operating currents 5-8, we get a table, where O - the relay does not work, 1 - the relay is activated.

Each zone has its own combination of relay states, therefore

Such a combination uniquely determines the zone where the short circuit has occurred.

The signal unit 10 has graduation tables, the number of which

the winding of transformer 13 voltage 30 is limited by the number of zones with one-connected to the traction network 16, and the current transformer 14 to the line 17 connecting the middle point of the autotransformer 18 with the rail 19i

Transformers 3 and 4 of the current are turned on, by the input current resistance Z, fixed by primary windings, respectively, in lines 20 and 21, connecting the middle points of auto-transformers 22 and 23 to the rail 19. One winding of each autotransformer 18, 22 and Q 23 is connected with the supply wire 24, and the other with the contact network 16.

The secondary winding of the current transformer 3 is connected to the windings of the current relay 5 and 6, and their contacts are connected to the logic unit 9, the current transformer 4 is similarly connected to the windings of the current relay 7 and 8, and their contacts are also connected to the logic unit 9 via communication line 12.

Logic block 9 is connected with registering device 2 via block 10. Elements 2, 9 and 10 are installed at the control room.

Information on the magnitude of the input resistance measured at the substation 15 by the sensor 1 of the input resistance., And information on the state of operation or failure of the relay

50

55

In this case, the registering device 2 corresponds to three different values of the distance between the substation and the ground location} .:

I K1 1 K1 I-KZ

The state of relay 5-8 is as follows: relay 5 is activated (state 1), relay 6 is activated (state 1), relay 7 and 8 do not operate (state O). This combination of relay states corresponds to zone II. Consequently, the damage occurred at a distance of 1 from the substation.

Thus, on the registering device 2, information about the magnitude of the input short-circuit resistance Z, the controller, using the table that corresponds to one or another given combination of relay states, uniquely identifies the location of the fault in the traction network.

If you need to control the area with a large number of autotransformers, the issue of determining the location

Ik on

significant dependence of Z on the controlled area.

Let, for example, 5 damage occurred at point K (Figures 2 and 3). Value

Q

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0

five

In this case, the registering device 2 corresponds to three different values of the distance between the substation and the ground location} .:

I K1 1 K1 I-KZ

The state of relay 5-8 is as follows: relay 5 is activated (state 1), relay 6 is activated (state 1), relay 7 and 8 do not operate (state O). This combination of relay states corresponds to zone II. Consequently, the damage occurred at a distance of 1 from the substation.

Thus, on the registering device 2, information about the magnitude of the input short-circuit resistance Z, the controller, using the table that corresponds to one or another given combination of relay states, uniquely identifies the location of the fault in the traction network.

If you need to control the area with a large number of autotransformers, the issue of determining the location

Damage is solved similarly. At the same time, the number of zones of unambiguous dependence only increases, and consequently, the number of tables.

Claims (1)

Invention Formula A device for determining the location of damage to the traction network with autotransformers of the electrified railway, comprising an input impedance sensor installed at the traction substation and connected to the recording unit via a communication line, in order to improve the accuracy of the place of damage, the device is equipped with a current transformer and two current relays installed at each autotransformer, a logic unit and an alarm unit installed at the control center, and power windings of current transformers included in the circuit of the terminals of the middle points of autotransformers, and their secondary windings are connected to a current relay, the contacts of which are connected to a logic unit connected to an alarm unit connected to the registering by block. I. in which a short circuit Current relay EV "J HF1 5v: - N h N fO  I b N