RU162214U1 - WAY RECEIVER OF PHASE-SENSITIVE RAIL CHAIN FOR SECTIONS WITH ELECTRIC AC AC - Google Patents

Abstract

The utility model relates to the field of railway automation and telemechanics and provides increased noise immunity of track receivers in phase-sensitive rail circuits in areas with alternating current electric traction.

The essence of the utility model is that the track receiver is equipped with a notch filter, which is additionally tuned to the frequency of the signal current of the rail circuit 25 Hz, connected in series with the protective block filter and representing a two-terminal device containing a capacitor and an inductor connected in parallel.

Description

“The technical field to which the utility model belongs”

The utility model relates to the field of railway automation and telemechanics and provides increased noise immunity of track receivers in phase-sensitive rail circuits in areas with alternating current electric traction.

"Prior art"

Known track rail rail receiver for sections with AC electric traction, containing a neutral electromagnetic relay connected to the rail line through a choke transformer, a filter, as well as a matching device equipped with an insulating transformer, elements of current protection and surge protection [1]. However, this device is not protected from interference whose frequency is equal to or close to the signal current frequency.

Also known is a track detector of a phase-sensitive rail circuit for sections with alternating current electric traction, containing a two-element induction phase-sensitive relay, the local element of which is connected to a voltage source of 25 Hz frequency, and the track element with a protective block filter and four two-pole connected to it in parallel, each which consists of a series-connected capacitor and inductor, with the first additional two-terminal being tuned into resonance for a pass second harmonic traction current, a second two-terminal network is tuned to resonance to skip the third harmonic traction current, a third two-terminal network is tuned to resonance to skip the fifth harmonic traction current and a fourth two-pole configured to pass the seventh harmonic traction current; connected to the rail line through a matching device, which includes elements of current protection, surge protection and an isolation transformer, as well as through a choke transformer [2].

The sector of such a relay rises, including the front contacts of the relay, only if the voltage phase on the track element has a well-defined relationship with the voltage reference phase on the local element. This ensures protection against false triggering of the relay when an extraneous voltage enters its track element with a frequency equal to or close to the frequency of the signal current.

The disadvantage of such a traveling receiver is that the protective filter block has a relatively small resistance to the signal current with a frequency of 25 Hz. As shown by studies in the laboratory and in operating conditions, almost 50% of the signal current branches off into the protective block filter, without falling into the track element of the two-element induction relay. This leads to a decrease in torque on the relay sector [3].

The weakening of the torque causes a decrease in the stability of the rail chain in cases of a decrease in the insulation resistance of the rail line and / or an increase in the resistance of the rail threads in it, as well as when the interfering influence of interference from the traction current is amplified. In some cases, this leads to the falling off of the relay sector, the appearance of false occupancy of the monitored section of the track, and to the false blocking of the traffic light for prohibiting indication in front of a moving train. As a result, train safety deteriorates and losses in train work increase due to unplanned stops and train delays.

“Disclosure of a utility model”

The technical result of this utility model is to increase the stability of the operation of rail circuits with phase-sensitive track receivers in the event of adverse changes in the electrical parameters of the rail lines and the effects of powerful interference from the harmonics of the traction current.

To achieve the above technical result, a phase-sensitive rail circuit track receiver for sections with alternating current electric traction is proposed, including a two-element phase-sensitive induction relay containing a local element connected to a 25 Hz reference voltage source and a track element connected in parallel to the protective block filter and filter harmonics of the traction current, equipped with four bipolar connected in parallel, each of which consists of series-connected x capacitor and inductance, the first additional two-terminal device configured to resonate to pass the second harmonic of the traction current, the second two-terminal device configured to resonate to pass the third harmonic of the traction current, the third two-terminal device configured to resonate to pass the fifth harmonic traction current and the fourth two-terminal device is configured to resonate to skip the seventh harmonic of the traction current, while it is connected to the ice line through the matching device, which includes elements of current protection, surge protection and an isolation transformer, as well as through a choke-transformer, and it is equipped with a notch filter additionally tuned to the frequency of the signal current of the rail circuit 25 Hz, connected in series with the protective unit -filter and which is a two-terminal device containing a parallel-connected capacitor and inductor.

"Brief Description of the Drawings"

In FIG. 1 is a structural diagram of the claimed track receiver phase-sensitive rail circuit for sections with electric AC.

"Implementation of a utility model"

The track detector of the phase-sensitive rail circuit for sections with AC electric traction contains a two-element induction phase-sensitive relay 1, the local element of which is connected to the signal voltage source 2 with a frequency of 25 Hz, and the track element of this relay has the signal voltage from the rail line 3, divided into sections of the path by insulating joints 4, is fed through a choke-transformer 5 and a matching device 6.

In parallel with the local element of the two-element induction phase-sensitive relay 1, a protective block filter 7 is connected, configured to pass a current of 50 Hz through it and connected in series with a notch filter 8, which is a two-terminal tuned into resonance at a frequency of 25 Hz, containing a capacitor and an inductor connected in parallel.

In parallel with the local element of the two-element induction phase-sensitive relay 1, a traction current harmonic filter 9 is also connected, the circuit of which consists of four two-terminal 10, 11, 12 and 13. Each of these two-terminal contains a capacitor and an inductor connected in series.

Before putting the track receiver into operation, the two-pole notch filter 8, containing the inductor L5 and capacitor C5, is tuned to resonance at a signal frequency of the rail circuit current of 25 Hz. In the filter 9 harmonics of the traction current, the first two-terminal 10 containing the inductor L1 and capacitor C1 is tuned to the resonance at the frequency of the second harmonic of the traction current 100 Hz; the second two-terminal 11, containing the inductor G2 and the capacitor C2, is tuned to resonance at a frequency of the third harmonic of the traction current of 150 Hz; the third two-terminal 12, containing the inductor L3 and capacitor C3, is tuned to the resonance at the fifth harmonic frequency of the traction current 250 Hz and the fourth two-terminal 13, containing the inductor L4 and the capacitor C4, is tuned to the resonance at the frequency of the seventh harmonic of the traction current 350 Hz.

After the track receiver is turned on, the useful signal voltage of 25 Hz along with the interference voltage from the traction current from the rail line 3 through the inductor transformer 5 and the matching device 6 is fed to the track element of the two-element induction phase-sensitive relay 1, to the protective block filter 7 connected in series and a notch filter 8, as well as two-terminal 10, 11, 12 and 13 of the filter 9 harmonics of the traction current. The protective block filter 7 is configured to let a current with a frequency of 50 Hz pass through it and has a resistance much lower for that frequency than the resistance of the winding of the track element of relay 1. Therefore, the main part of the interference current with a frequency of 50 Hz passes through the protective block filter 7 without getting into winding of track relay 1.

The two-terminal 10 is configured to pass through it a signal with a frequency of 100 Hz, so the main part of the interference current from the second harmonic of the traction current is shunted by this two-pole, not falling into the winding of the track element of relay 1. Similarly, the main part of the interference currents at a frequency of the third, fifth and seventh harmonics of the traction current passes through the two-terminal 11, 12 and 13, respectively, without falling into the winding of the track element of relay 1.

The notch filter 8 is tuned to a signal current frequency of 25 Hz and has a high resistance for current with this frequency. Therefore, the leakage of the signal current of the rail circuit with a frequency of 25 Hz through the protective block filter 7 is small, and due to the reduction of this leakage, the signal-to-noise ratio in the track element of relay 1 is almost doubled. As a result, the stability of the rail circuit under the influence of interference from the traction current in the rails is significantly increased.

Thus, supplying the track receiver of the phase-sensitive rail circuit for sections with AC electric traction indicated by the notch filter provides a significant reduction in the degree of attenuation of the signal current in the track element of the two-element induction phase-sensitive relay by the protective block filter. This guarantees the elimination of false release of the relay sector in case of adverse changes in the electrical parameters of the rail lines and the influence of powerful interference from the harmonics of the traction current. The result is an increase in the safety of train traffic due to the elimination of the need for emergency braking during false overlap of the traffic light for prohibiting indications in front of a moving train, reduction of losses due to unplanned stops and train delays.

Information sources

1. Bryleev A.M., Kravtsov Yu.A., Shishlyakov A.A. Theory, structure and operation of rail chains. - M .: Transport, 1978.- 344 p.

2. Pat. 74611 Russian Federation, IPC ⁵ C2 B61L 23/16. Track receiver of a phase-sensitive rail circuit for sections with alternating current electric traction / Shamanov V.I., Aleshechkin Yu.A., Pultiakov A.V., Trofimov Yu.A., Shamanova S.I .; applicant and patentee Irkut. state University of Communications (RF). Bull. No. 19. - 5 p.: Ill.

3. Shamanov V.I. Electromagnetic compatibility of railway automation and telemechanics systems. - M .: FSBEI "Educational and Methodological Center for Education in Railway Transport", 2013. - 244 p.

Claims (1)

Phase sensitive rail circuit receiver for sections with alternating current electric traction, comprising a two-element induction phase sensitive relay containing a local element connected to a 25 Hz reference voltage source, and a track element connected in parallel to a protective block filter and a traction current harmonic filter equipped with four bipolar connected in parallel, each of which consists of a series-connected capacitor and inductor, and the first bipolar k is configured to resonate to pass the second harmonic of the traction current, the second two-terminal is configured to resonate to pass the third harmonic of the traction current, the third two-terminal is configured to resonate to pass the fifth harmonic of the traction current and the fourth two-terminal is tunable into resonance for the passage of the seventh harmonic of the traction current, while it is connected to the rail line through a matching device, which includes elements of the current protection, surge protection and isolation transformer, as well as through a choke transformer, characterized in that it is equipped with an additional notch filter tuned in resonance to the signal current frequency of the rail circuit 25 Hz, connected in series with a protective block filter and consisting of a two-terminal device containing parallel connected capacitor and inductor.

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