SU385771A1 - DEVICE FOR TELEBLOCK SWITCHES FIDERS CONTACT NETWORK OF ELECTRIC RAILWAYS - Google Patents

Description

one

The invention relates to the field of protection of a contact network and provides for selective disconnection of the section between the traction substation and the partition post without time delay. In particular, the invention is intended for transmitting commands and switching off feeder switches installed at power points and partitioning of a catenary network.

A device for teleblocking breakers of the contact rail of a network of electric railways is known, comprising a receiver, a non-distributor and output elements. In the known device, command discrimination is performed according to a temporary impulse attribute.

However, the known device does not provide the required speed when a short circuit is disconnected, it does not have enough high sensitivity, low noise immunity and does not allow two adjacent feeder switches to be switched off when damaged simultaneously on two legs.

In order to increase the reliability of the teleblocking operation in the proposed device, the feeder protection block is connected to the frequency impulse transmitter via the logic element OR connected by means of a transistor-capacitive delay stage

with the C-generator and through the logic element “And, connected through another cascade of delay to the maninator, whose collector resistance is connected to the average

a point between a capacitor bridge and a capacitor connected to the same point with a negative potential of the source of the thread, and the other input of the manipulator connected to the protection device.

In order to increase the speed, the collector resistance of one of the indicated transistor-capacitive delay stages of the transmitter is connected to the midpoint of the / C divider connected by the positive potential of the source and the base and the base of the first transistor of the pointing / C-generator amplifier.

In order to improve noise immunity, the indication receiver is equipped with transistor-capacitance delays connected between the collectors of forming transistors and output transistors. FIG. 1 shows a block diagram of the proposed device; on fng. 2 - diagram of the transmitting kit; on fng. 3 - diagram of the receiving set.

The device for teleblocking includes two identical blocks / protection, outstanding.

The signal is non-distributor 2, antenna 3 n output elements 4, which are controlled in different horizontal lines of the contact network. Sngnals from one set to another are transmitted on lines 5 of their codes.

To reduce the number of circuit elements and increase the reliability of the teleblocking unit / set, it is intended for two feeders of the catenary network, and independent frequency channels are provided for increasing the speed and noise immunity for each pair of feeders.

Transmitter 2 teleblocking consists of a / C generator 6, amplifiers 7 and 8, a filter I manul tor tor 10, cascades 11 and 12 delays, and output logic stages “AND and“ OR. Normally at inputs 13 and 14 of the transmitter there is no signal about the operation of the protection. The transistor 15 of the thermistor capacitance stage 11 of the delay is open and blocks the transistor 16 / C-generator. When the block / protection of the first feeder is triggered, the signal is fed to the input 13 of the transmitter 2. The transistor / 5 delay stage closes while the capacitor 17 discharges and clears the pickup from the transistor 16 of the C-generator 6. Simultaneously opens the transistor 18 of the main pulse 10 and connects to / C -generator resistance 19. Under these conditions, the generator begins to generate a frequency ft, which is then amplified by amplifier 7, passes through a narrow-band filter 9, amplified by power amplifier 8, and sent via link 5 through a matching unit 20 on the next item.

When the protection unit / other feeder is triggered, the signal is fed to the input 14 of the transmitter 2. At the same time, the transistor 15 is closed, and the main transistor 10 of the transmitter 18 is closed. The / C generator generates another frequency / 2, which enters the communication line 5, is received by the receiver 5 of the neighboring point and causes the oil switch (not shown in the diagram) to switch off of the corresponding feeder.

With simultaneous triggering of the request blocks of both feeders, the signals from inputs 13 and 14 through the AND circuit and the delay stage 12 are received and through the OR to cascade / delay element.

O.Juvrepepno the signal from input 13 goes to the manipulator 10. The signal coming from the element "OR, triggers the action of the cascade // n excited-nie / C-reiiepaTOpa 6. The signal, post-1 and 1 from the scheme" And pa cascade 12, leads to the fact that the transistor 18 of the transducer 10 is closed for a time determined by the POSITIONAL DISCHARGE time of the cascade sensor 21 of the cascade 12. At this time, the generator produces a frequency fz that causes the corresponding switch to turn off at an adjacent point. The discharge time of the capacitor 21 is chosen so as to ensure the operation of the output elements of the adjacent receiving half set. After the capacitor is discharged, the transistor 22 closes, the notepad from the manipulator 10 is removed. At the same time, the frequency / s and then / s is transmitted to the link 5, and, as a result, the first one and then the other feeder switches are disconnected.

The receiver 3 teleblokirovki (see Fig. 3) cocTOiiT from the input filter 23, amplifier 24, disprit: inator 25 and two cascades 26 and

27 transistor delay, intended for protection against imimage interference at the input of the filter 23. Detector 25 is a frequency detector that generates frequency signals into DC pulses. Two resonator circuits of capacitive type are provided in the discriminator, and the frequency of one circuit is chosen equal to fb and the second circuit- / 2. When a pulse arrives at the receiver input with a frequency fi corresponding to one of the feeders, the impulse on the circuit of the transformer 28 becomes equal to the maximum, and on the transformer 29 there will be only a small residual voltage. Conversely, with the arrival of the frequency / 2, the maximum minimum voltage will be on the circuit of the transformer 29, and m1Imally - on the coder of the transformer 28.

The voltage from the resonant transformers is rectified and supplied to the transistors.

30 and 31 forming cascades, included in the differential scheme. In accordance with the received frequency, transistor 30 is closed, and transistor 32 is opened. The transistor 32 is closed at the time of the discharge of the capacitor 33. After the completion of the discharge of the capacitor, the output transistor 34 closes and outputs a sigal and ak, and the corresponding feeder.

Prp admission from line 5 communication adjacent

Frequency / 2 receiver set works in the same way, issuing a command to switch off the other feeder.

In order to tune out the noise in the receiving half-set of the teleblocking system, special stages 35 and 3 are delayed.

Subject invention

Claims (3)

1. A device for the teleblocking of the switches of the feeders of the contact network of electric railways, containing protection blocks, a transmitter and receiver of frequency pulses and output elements, characterized by so that, for the purpose of verifying the reliability of the remote blocking operation, feeder protection units are connected to the transmitter via the logical element "OR, connected via a transistor-capacitive delay stage with the / PC-hypervisor, and the logical element" with a maniaulator, whose collector adapter is connected to the midpoint between the capacitors of the resistor-capacitive bridge and is connected to the same point a resistor is connected to the negative potential of the power supply, and the other input of the manipulator is connected to the protection unit. 2. The device according to claim 1, characterized in that, in order to increase the speed, the collector resistance of one of the transistor-capacitive delay stages of the transmitter is connected to the midpoint of the / C-divider connected between the positive potential of the power source and the base of the first transistor of the specified amplifier C -generator. 3. Device by CPU. 1 and 2, characterized in that, in order to increase noise immunity, said receiver is provided with transistor-capacitive delay stages connected between collectors of forming transistors and output transistors.  3