RU2337448C1 - Contact system - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is related to electric engineering. Contact system contains power supply source, breaker, contact wire, measuring devices, unit of comparison of contact wire temperature with preset value and disconnection of contact system in case contact wire temperature exceeds preset value, at that every of measuring devices is installed in contact wire as temperature detector, the inlet of which is connected to contact wire, and outlet is connected to the inlet of radio transmitter, which is installed in contact wire and provides transmission of information about temperature of contact wire to the inlet of radio transmitter, the outlet of which is connected to the inlet of comparison of contact wire temperature with preset value and disconnection of contact system in case contact wire temperature exceeds preset value.

EFFECT: creation of contact system, which is characterised by high validity of contact wire temperature measurement and high operational reliability.

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Description

The invention relates to electrical engineering, in particular to the power supply of electrified railways, and may find application in contact networks of electrified railways.

Known contact network containing a power source, a switch, a contact wire, measuring devices made in the form of a calculation unit that provides information about the temperature of the contact wire, a unit for comparing the temperature of the contact wire with a predetermined value, and a block for disconnecting the contact network when the temperature of the contact wire is exceeded a preset value that ensures that the contact circuit breaker disconnects from the power source when the temperature exceeds the contact voltage of the set value, while the calculation unit fixes the value of the current flowing through the contact wire, and the calculation of the temperature values of the contact wire is carried out according to the following mathematical dependence:

DQ / dt + aFQ / Cm-P / Cm = O,

where Q is the overheating temperature of the wire relative to the ambient temperature, ° C;

t is the time, s;

a - the resulting heat transfer coefficient, W / m · C;

F is the surface area of a unit length of wire numerically equal to the perimeter;

C is the specific heat of the material, W · s / kg · C;

m is the mass of a unit length of wire, kg / m;

P is the power of joule losses per unit length of wire, W / m [1].

The contact network described in [1] is characterized by a relatively insufficient reliability of the calculated determination of the temperature of the contact wire and relatively low operational reliability due to the insufficient efficiency of disconnecting the contact network from the power source when the actual values of the temperature of the contact wire exceed the specified values.

The invention solves the problem of creating a contact network devoid of the noted drawbacks, characterized by high reliability of determining the temperature of the contact wire and high operational reliability due to the high efficiency of disconnecting the contact network switch from the power source when the temperature values of the contact wire exceed the specified values.

To solve the problem in a contact network containing a power source, a switch, a contact wire, measuring devices that provide information on the temperature of the contact wire, a unit for comparing the temperature values of the contact wire with the set value, and disconnecting the contact network when the temperature of the contact wire exceeds the set value, providing disconnection by the circuit breaker of the contact network from the power source when the temperature values of the contact wire exceed the specified According to the present invention, it is proposed that each of the measuring devices be arranged on the contact wire and made in the form of a temperature sensor, the input of which is connected to the contact wire, and the output is connected to the input of a radio transmitter located on the contact wire and transmitting information about the contact temperature wires to the input of the radio receiver, the output of which is connected to the input of the unit for comparing the temperature values of the contact wire with the set value and disconnecting the contact network when Vyshen trolley wire temperature setpoint values, providing the tripping switch contact network from the power source when the temperature exceeds values of the trolley wire setpoint.

The invention is illustrated by the example of the drawing, which shows a functional diagram of the inventive contact network.

Contact network 1 contains a power source 2, a switch 3 and a contact wire 4.

The measuring device is made in the form of temperature sensors 5, located on the contact wire 4 and is designed to obtain information about the temperature of the contact wire 4.

The input 6 of the temperature sensor 5 is connected to the contact wire 4, and the output 7 of the temperature sensor 5 is connected to the input 8 of the radio transmitter 9. The radio transmitter antenna 10 of the radio transmitter 9 is connected by radio communication to the radio antenna 11 of the radio receiver 12. The output 13 of the radio receiver 12 is connected to the input 14 of the comparison unit 15 the values of the temperature of the contact wire 4 and the set value, as well as disconnecting the switch 3 of the contact network 1 from the power source 2 when the temperature of the contact wire 4 exceeds the set value.

Contact network works as follows.

The temperature sensor 5, due to the connection of its input 6 to the contact wire 4, measures the temperature of the contact wire 4. Then, the temperature information of the contact wire 4 is fed to input 8 of the radio transmitter 9, and from its output 10 it is fed to input 11 of the radio receiver 12. Then, from the output 13 of the radio receiver 12, this information is fed to the input 14 of the block 15 for comparing the temperature of the contact wire with the set value and disconnecting the switch 3 of the contact network 1 from the power source 2 when the contact temperature is exceeded setpoint wires. When the temperature values of the contact wire 4, not exceeding the set value, the operation of the contact network 1 continues in normal mode. When the values of the temperature of the contact wire 4 exceeding the set value, the block 15 ensures that the switch 3 disconnects the contact network 1 from the power source 2.

The implementation of the contact network in accordance with the proposed solution will increase its operational reliability by relatively simple means, to quickly disconnect the contact network from the power source in cases when the temperature value of the contact wire exceeds the set value.

In accordance with the claimed decision, OOO NPP Elektromash developed technical documentation for a device containing a temperature sensor, a radio receiver and a radio transmitter, and made a prototype of it.

Tests of the prototype confirmed its efficiency and wide possibilities for its practical application in the future.

Literature

1. Article by Naboychenko I.O., Verbitsky V.A. and others. "Protection against annealing of wires of the contact network" in the journal "Locomotive" No. 9, 1996

Claims (1)

A contact network containing a power source, a switch, a contact wire, measuring devices that provide information on the temperature of the contact wire, a unit for comparing the temperature of the contact wire with the set value and disconnecting the contact network when the temperature of the contact wire exceeds the set value, which enables the circuit breaker to turn off the contact network from the power source when the temperature values of the contact wire exceed the set value, characterized in that each of the measuring devices is located on the contact wire and is made in the form of a temperature sensor, the input of which is connected to the contact wire, and the output is connected to the input of a radio transmitter located on the contact wire and transmitting information about the temperature of the contact wire to the input of the radio receiver, the output of which is connected to the input unit for comparing the temperature of the contact wire with the set value and disconnecting the contact network when the temperature of the contact wire exceeds the specified value an element that ensures that the circuit breaker disconnects the contact network from the power source when the temperature values of the contact wire exceed the set value.