CZ2005301A3 - Electronic phase-sensitive receiver - Google Patents

Abstract

In an electrical phase sensitive receiver, a first receiver input (4) is connected to the input of the first transformer (1), and a first input of a phase detector (7) is connected to the output of the first transformer (1) and an output of the RC filter (9) connected its output to the first input of the dynamic function level circuit (10) whose first output via the tuned LC circuit (11) and the second output are connected to the input of the third transformer (3) connected by its output to the input of the output rectifier (12) whose output it is connected to the receiver output (6). The input of the second transformer (2) is connected to the second input (5) of the receiver and the output of the second transformer (2) is connected to the input of the forming and auxiliary power supply (8), the first output of which is connected to the second input of the phase detector (7) and the second output is connected to the second input of the dynamic circuit level circuit (10).

Description

Electronic phase-sensitive receiver

Technical field

The invention relates to an electronic phase-sensitive receiver for use in rail, in particular rail transport, both in station and rail track circuits. The function of the electronic phase-sensitive receiver when implemented in these circuits ensures safe control of the rail and cable connections while increasing the interference limit in the reverse traction current The signal frequencies used are 75 Hz and 275 Hz.

BACKGROUND OF THE INVENTION

Until now, inductive electromechanical phase relays have been used in electrical circuits to assess the freedom or occupancy of rail circuits by railway vehicles, which perform this function relatively safely in the sense of safety technology. The safety itself is conditioned by regular testing and, within the prescribed deadlines, by the replacement of induction electromechanical phase relays. This is especially true for rail vehicles with conventional electric drive control.

In modern railway vehicles with inverter control of electric drive, the use of inductive electromechanical phase relays in safety circuits limits their technical characteristics. In particular, the resistance of the track circuits to the effects of disturbing currents generated by the heating currents and the return traction currents is limited. Heating currents are currents used to heat trains. They can be generated either by a generator on a traction vehicle at a voltage of 3kV, where the rail is used as a return conductor, or by transducers located in individual wagons, which also constitute a source of interference. The disturbing current is transmitted by the track circuit equipment and the wiring to the rail winding of the rail relay, where it generates a hazardous voltage. A dangerous condition occurs when the components of the disturbing current in the two rails are not identical. The worst situation occurs when one cable jumper between the contact transformer and the track strip is broken due to a fault.

All of the above goes against rail safety. The demanding railway regulations do not allow the use of inductive electromechanical phase relays at all in such cases and safety has to be ensured in a complicated way by means of other relatively expensive devices. This, however, introduces an additional element into the system as a possible source of faults and increases energy consumption.

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SUMMARY OF THE INVENTION

These drawbacks are overcome by an electronic phase-sensitive receiver consisting of transformers, phase detector, crimper and auxiliary power supply, RC filter, level circuit with dynamic function, tuned LC circuit and output rectifier bridge, which consists in connecting the first transformer to the first receiver input. The first input of the phase detector is connected to the output of the first transformer, the output of which is connected to the input of the RC filter. The RC filter output is connected to the first level circuit input with dynamic function. The first output of the level circuit with the dynamic function is connected via the tuned LC circuit together with the second output of the level circuit with the dynamic function to the input of the third transformer, whose output is connected to the input of the output rectifier bridge. The output rectifier bridge output is connected to the receiver output. The input of the second transformer is connected to the second input of the receiver. The output of the second transformer is connected to the input of the former and the auxiliary feeder, whose first output is connected to the second input of the phase detector and the second output is connected to the second input of the level circuit with dynamic function.

The main advantage of the electronic phase-sensitive receiver according to the invention, when used in a track circuit, is the increased immunity against back-current traction. When implemented in these circuits, the electronic phase-sensitive receiver ensures safe control of rail and cable connections when the interference limit in the reverse traction current is increased to approximately 0.3 A at a signal frequency of 275 Hz and approximately 0.5 A at a signal frequency of 75 Hz. These values can be achieved due to a reserve in the required shunt sensitivity, tensile sensitivity, higher tripping coefficient, better impedance matching and optimal tuning of the track circuit. The above is particularly appreciated when operating on a 25 kV / 50 Hz traction system, where interference is most unfavorable. The use of an electronic phase-sensitive receiver will reduce both the requirements for regular inspections and maintenance of rail circuits, while reducing energy consumption and, secondly, allowing foreign carriers to enter our rail network with their own traction vehicles.

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Drawing overview *

The electronic phase-sensitive receiver according to the invention can be seen from the attached figure. The diagram shows a block diagram of an electronic phase sensitive receiver. The arrows in the figure indicate the direction of the signal.

DETAILED DESCRIPTION OF THE INVENTION

A practical embodiment of an electronic phase sensitive receiver according to the invention is shown in Fig. 1.

In Fig. 1, the first input 4 of the receiver is connected to the input of the first transformer I. The output of the first transformer 1 is connected to the first input of the phase detector 7, the output of which is connected to the input of the RC filter 9. The output of the RC filter 9 is connected to the first input of the level circuit 10 with dynamic function. the output of the third transformer 3 is connected to the input of the output rectifier bridge 12, the output of which is connected to the output 6 of the receiver. The input of the second transformer 2 is connected to the second input 5 of the receiver. The output of the second transformer 2 is connected to the input of the former and the auxiliary feeder 8. The first output of the former and the auxiliary supply 8 is connected to the second input of the phase detector 7 and the second output of the former is connected to the second input of the level circuit 10 with dynamic function.

The electronic phase-sensitive receiver according to the figure operates by applying the input voltage of the rail phase to the first input 4 of the receiver. The second input 5 of the receiver receives the input voltage of the local phase. The first transformer 1 and the second transformer 2 are isolation transformers. The input phase voltage of the local phase is fed via a separating second transformer 2 to the former and the auxiliary power supply 8, where an alternating voltage is generated for the phase detector 7 and an auxiliary direct current supply voltage for the level circuit 10 with dynamic function. A phase voltage input voltage is also applied to the phase detector 7 via the first transformer. After processing in the phase detector 7, the signal is routed to an RC filter 9 with a specified low pass filter and then to a level circuit 10 with a dynamic function. AC power fields and its harmonic components The third transformer 3 provides DC voltage separation. The last functional part of the electronic phase-sensitive receiver is the output rectifier bridge 12, which generates the DC voltage required to operate the respective relay.

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The electronic phase-sensitive receiver according to the invention can be used in three variants. The first option represents a direct replacement of the relay used originally. The second variant consists of a box with electronics for storage on a shelf and a separate relay of the first security group. The third variant consists of a cassette with electronics for mounting in 19 “baths and a relay of the first safety group. All electrical and other parameters meet the requirements given by railway regulations and ČSN standards. One or two rail phase systems can be mounted in the housing of an electronic phase-sensitive receiver of the second variant or of an electronically phase-sensitive receiver of the third variant, which is equivalent to replacing one or two electromechanical relays.

Industrial applicability

The electronic phase-sensitive receiver according to the invention can be advantageously used in rail, in particular rail transport, both in station and rail track circuits, the device itself being supplied with a local phase voltage of 230 V AC via a 275 Hz or 75 Hz converter.

Claims (1)

PATENT CLAIMS Electronic phase-sensitive receiver, consisting of transformers, phase detector, former and auxiliary power supply, RC filter, level circuit with dynamic function, tuned LC circuit and output rectifier bridge, characterized in that the input of the first transformer (1) is connected to the first input ( 4) the receiver and the output of the first transformer (1) is connected to the first input of the phase detector (7), the output of which is connected to the input of the RC filter (9) connected by its output to the first input of the level circuit (10) via a tuned LC circuit (11) and a second output are connected to an input of a third transformer (3) connected by its output to an output rectifier bridge (12) whose output is connected to a receiver output (6), the input of the second transformer (2) being connected to the second input (5) of the receiver and the output of the second transformer (2) is connected to the input of the former and the auxiliary feeder (8), the first output of which is connected to the second input of the phase detector (7) and the second output is connected to the second input of the level circuit (10) with dynamic function.