RU2636154C2 - Method of determination of short circuit place at electrified railway station - Google Patents

Abstract

FIELD: electricity.SUBSTANCE: according to the method at the moment of short circuit, the voltage is measured on the buses of the traction substation, the current of the supply line of the contact network section with a short circuit, the phase angle, the value of the inductive impedance of the short-circuit loop is calculated and compared with the pre-calculated values with a specified step of the inductive impedances of the short-circuit places on all section paths. The location of the fault is judged by taking the location for which the measured inductive impedance of the short-circuit loop is the same as that calculated one as a location of short-circuit. Preliminarily inside the section, the parallel connection of the contact network is eliminated by installing additional sectional insulators and loops providing a single path of short circuit current sequentially along each path of the station section to the short-circuit point.EFFECT: increased accuracy of definition of a short circuit location in a traction network of a multi-path section.2 dwg

Description

The invention relates to electrified railway transport and can be used to determine the location of a short circuit at the multi-track section of the station, receiving power on one supply line.

A known method for determining a damaged section, implemented in a device for protecting a multi-track section of an electrified railway, proposed in patent RU 2104604, IPC H02J 13/00 H02H 3/06. Protection device for a multi-track section of an electrified railway / Bykadorov A.L., Kuznetsov V.V., Kuznetsov G.V., Khomich B.M. (RU) - No. 96101842/28. declared 01/30/1996. publ. 02/10/1998. In this method, the following sequence of operations is carried out: Current sensor DT measures the amount of current flowing through a controlled disconnector. The measured current value comes from the output of the current sensor DT to the input of the threshold element PE. If the measured current exceeds the set value, a signal appears at the PE output. Further, the signal through the encoder and decoder enters through the communication channels in the control unit UB. The control unit UB on the basis of the received signals determines the damaged section and the disconnector, which must be disconnected. As a current sensor DT, a conventional current transformer can be used together with a rectifier. The authors used the simplest single-turn current transformers.

The threshold element of PE can be any device in which the output signal appears when a certain voltage is applied to the input of the DC voltage (a semiconductor zener diode, relay, comparator with a reference voltage source connected in series).

The disadvantages of this method include:

- installation of additional equipment;

- solving the problem of powering additional equipment;

- the need for maintenance of additional equipment;

- building the necessary communication channels;

- the ability to identify a damaged section, but not a place inside the section.

The essence of the proposed method is to modify the existing electrical circuit of the contact network of the multi-track section of the station. FIG. 1a so that a uniqueness of the path of the short circuit current is achieved sequentially on the contact network of each path of the station section to the short circuit point, by installing additional sectional insulators and loops FIG. 1b, by which parallel connection of the contact network is eliminated inside the section, calculated values of inductive resistances for short circuits are calculated for each point of the power supply circuit of the contact network, these values are entered into the database, inductance of the short circuit is measured at the traction substation at the moment of short circuit, and a comparison is made the measured inductive resistance of the short circuit with the calculated values of the inductive resistance of the short circuit from the database and As the fault location take place, for which the measured resistance inductive short-circuit loop coincides with the calculated value.

The proposed method provides high accuracy in determining the location of a short circuit in the traction network of a multi-track section without installing additional equipment not associated with the contact network device.

It is most convenient to implement the proposed method using a computer, however, such an implementation can also be performed manually.

To illustrate in FIG. Figure 1 shows an example of a possible application of the method for determining the location of a short circuit described in this patent. In FIG. 1a shows the simplest section of the contact network of a station, in which the paths of the station section are connected in parallel. To implement this method of determining the location of a short circuit, three sectional insulators are cut into the contact network. FIG. 1b. Under the indicated sections graphs of the dependences of inductive resistances on the picket are shown in plan, each thread of the graph corresponds to one section path, which are respectively numbered. Suppose a short circuit occurred on 4 paths, picket L1. In the original circuit of FIG. 1a, let the indication of the inductive resistance of the short-circuit loop X1 correspond to this place, and X2 in the modified circuit. In accordance with the graphs of inductive resistances, X1 indicates simultaneously several possible places of short circuits on paths 1-4 and stations L1-L6, and resistance X2 on the corresponding graph unambiguously indicates path 4 and station L1.

Claims (1)

A method for determining the location of a short circuit on a multi-track section of an electrified railway station, in which at the moment of a short circuit the voltage on the tires of the traction substation, the current of the supply line of the contact network section with a short circuit, the phase angle are measured, the inductance value of the short circuit loop is calculated and compared with pre-calculated values with a given step of inductive resistances of short circuit places on all the paths of the section and judge the place of damage, taking as The location of the short circuit is the place for which the measured inductive resistance of the short circuit coincides with the calculated one, characterized in that the parallel connection of the contact network is previously excluded inside the section by installing additional sectional insulators and loops providing a single path for the passage of the short circuit current sequentially along each path station sections to a short circuit point.

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