RU23420U1 - CONTROL SUSPENSION TEMPERATURE CONTROL DEVICE - Google Patents

Abstract

A device for monitoring the temperature of a contact suspension, comprising a temperature sensor, a functional temperature converter and an element for tripping a switch, characterized in that it additionally includes a first DC amplifier, the input of which is connected to the output of the temperature sensor, and the output to the input of the temperature sensor, transmitter whose input is connected to the output of the converter, and the output through the first isolation capacitor to the contact suspension wire, which is used for signal transmission from the point where the temperature sensor is connected to the traction substation, where a second isolation capacitor is connected to the feeder supplying the contact network, to which the receiver is connected, and a series-pass bandpass filter, a detector, and a second DC amplifier are connected to the output of the receiver, the output of which is connected to switch disconnect element.

Description

Device for monitoring the temperature of the contact suspension

The utility model relates to the field of thermal protection of a contact network, namely, to temperature control devices for contact suspension wires.

A device for protecting wires of a direct current contact network, comprising a current sensor, the output of which through a threshold element is connected to the input of the key element, the output of which is connected to the input of the protective shutdown element; which is equipped with an additional threshold element, a driver of the control signal made on the RS-trigger, a delay element made on the RC circuit, a voltage divider, the middle point of which is connected to the input of the protective shutdown element, delayed, and its extreme points to the output of the current sensor ; the RS trigger output is connected to the output of the key element, its direct input is connected to the output of the additional threshold element, and the input of the additional threshold element is connected to the midpoint of the delay element, the extreme points of which are connected to the output of current sensor 1.

The disadvantage of this device is the indirect temperature control of the wires of the contact network according to the Joule-Lenz law.

It is also known a device for protecting the contact network from overheating by current, comprising a temperature sensor located on the contact network wire, a threshold element, a temperature functional converter and a digital-to-analog converter, the inputs of which are connected to the corresponding outputs of the reversible counter, one input of which is connected to the element NOT connected to the input with exit

IPC: V60M 3/00 of a threshold element connected to one of the inputs of the And element, the other

the input of which is connected to the pulse generator, and the output to the other input of the reversible counter and the circuit breaker tripping element, additionally equipped with a time delay element, through which the output of the threshold element is connected to the input of the element NOT, a zero-organ whose inputs are connected respectively to the output of the temperature functional converter and the output of the digital-to-analog converter, and the output with the trip element of switch 2.

The disadvantage of this device is the inability to remotely control the contact suspension section remote from the substation, since it is impossible to connect a temperature sensor and a long connecting line to the device for the following reasons:

- strong attenuation of the signal in the connecting line, since the EMF of the temperature sensor does not exceed 20 mV / ° C;

- A large level of interference on long connecting wires.

Due to these reasons, low accuracy of temperature control of a remote section of the contact suspension is obtained.

This device is selected as a prototype.

The purpose of the utility model is to increase the accuracy of temperature control of a remote section of the contact suspension.

The goal is achieved by the fact that in the known device containing a temperature sensor, a functional temperature converter and a trip element of the switch, a first DC amplifier is additionally introduced, the input of which is connected to the output of the temperature sensor, and the output to the input of the temperature functional converter, the transmitter whose input is connected to the output of the functional temperature converter, and the output through the first isolation capacitor to the contact suspension wire, which is used for signal transmission from the sensor connection

M & ll n

2 temperatures to the traction substation, where to the feeder feeding the contact

a network, a second isolation capacitor is connected, to which the receiver is connected, a series-connected bandpass filter, a detector and a second DC amplifier, the output of which is connected to the circuit breaker trip element, are connected to the output of the receiver.

A diagram of the proposed device is shown in FIG. 1, where the contact suspension wire 1, temperature sensor 2, first DC amplifier 3, temperature functional converter 4, transmitter 5, first isolation capacitor 6, feeder supplying the contact network 7, second isolation capacitor 8, receiver 9, band-pass filter 10, the detector 11, the second DC amplifier 12 and the tripping element of the switch 13.

To control the temperature of the wire of the contact suspension 1, a temperature sensor 2 is fixed on it, to the output of which the first DC amplifier 3 is connected. From the output of the first DC amplifier, a signal proportional to the temperature of the wire is fed to the input of the temperature functional converter 4, which is converted into a constant amplitude signal with a varying frequency in the region from 700 to 1300 Hz. This signal is fed to the input of the transmitter 5, operating at a carrier ultrasonic frequency. The signal from the output of the transmitter 5 through the first isolation capacitor 6 enters the wire of the contact suspension 1, which is used as a communication channel. Near the substation, a feed feeder 7 is connected to the wire of the contact suspension 1. A second isolation capacitor 8 is connected to it, to which a receiver 9 is connected, which converts the ultrasonic frequency signal into a signal with a frequency of 700 ... 1300 Hz. From the output of the receiver 9, the signal is fed to a half-filter 10, which reduces the effect of noise arising in the wire of the contact suspension on the operation of the device. Detector connected to the output of the bandpass filter AND converts

.

3 signal with a frequency of 700 ... 1300 Hz in direct current, which is amplified

a second DC amplifier 12, to the output of which a trip element 13 is connected.

The device operates as follows. Temperature sensor 2 constantly monitors the temperature of the contact suspension wire. The signal from the temperature sensor is amplified by the first DC amplifier 3 to the value required for the functional temperature converter 4. The higher the temperature, the higher the frequency at the output of the functional temperature converter 4. The transmitter 5 generates a frequency-modulated ultrasonic frequency signal, which through the first isolation capacitor 6, ayush, transmitter from the influence of a high voltage of the contact network, enters the wire of the contact suspension used as a communication channel ski 1. Through the wire connected to the contact suspension wire, the feeder 7 receives an ultrasonic frequency signal to the second isolation capacitor 8, isolation 1, un; receiving receiver 9 from the influence of the high voltage of the contact network. In the receiver 9, the ultrasonic frequency signal is converted into a signal with a frequency of 700 ... 1300 Hz, which is fed to the input of the bandpass filter 10 with the same passband. In a band-pass filter, the signal is deciphered; it is received from the interference coming from the communication channel. The detector 11 converts a signal with a frequency of 700 ... 1300 Hz into a DC signal. The higher the initial temperature of the contact suspension wire, the higher the value of the DC signal. A second DC amplifier 12 is connected to the detector output, which amplifies the DC signal to a value sufficient to operate the circuit breaker tripping element when the contact suspension reaches a critical temperature.

4 The proposed device can be used on trunk

railways, especially in areas of intense ice formation on the wires of the suspension suspension, ice melting can occur due to electric current. The device simultaneously protects the wires of the contact suspension from overheating and annealing.

5

The authors

Labunsky L.S. Teplyakov V.B.

Applicant:

Vice-rector / SamIITar

Tarasov E.M.

Claims (1)

A device for monitoring the temperature of a contact suspension, comprising a temperature sensor, a functional temperature converter and an element for tripping a switch, characterized in that it additionally includes a first DC amplifier, the input of which is connected to the output of the temperature sensor, and the output to the input of the temperature sensor, transmitter whose input is connected to the output of the converter, and the output through the first isolation capacitor to the contact suspension wire, which is used for signal transmission from the point where the temperature sensor is connected to the traction substation, where a second isolation capacitor is connected to the feeder supplying the contact network, to which the receiver is connected, and a series-pass bandpass filter, a detector, and a second DC amplifier are connected to the output of the receiver, the output of which is connected to switch disconnect element.