Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B61—RAILWAYS
  • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
  • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
  • B61L1/18—Railway track circuits
  • B61L1/181—Details
  • B61L1/182—Use of current of indifferent sort or a combination of different current types
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
  • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
  • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging

Definitions

• the invention concerns the phase-sensitive evaluation of the conductive current of the track circuit, which is part of the railway signalling equipment.
• Conductive currents are generated in driving units of railway vehicles with asynchronous engines, which are supplied by track voltage of DC traction or AC traction.
• Conductive currents flow through a track circuit because, that one rail or both rails are part of a back line, directed to the second pole of the source of the trolley voltage.
• Conductive currents flowing through track circuits are currently evaluated either in an analogue manner with the use of an analogue selective ammeter, which directly evaluates the effective value of the conductive currents in the area of track circuit frequencies, or also digitally with the use of harmonic analysis in the area of frequency of track circuit.
• the first primary-range effective component, the second primary-range effective component, up to the last primary-range effective component of the endangering currents for the first frequency are stated towards the reference phase network, i.e. towards the first reference phase, the second reference phase up to the last reference phase.
• the first primary- range effective component or the second primary-range effective component or up to the last primary-range effective component of the endangering currents for the first frequency is evaluated as an above-limit value, if it has at one polarity, i.e. if the relevant phase is longer, than the critical time, an above-limit value, necessary for excitation of the track receiver in terms of the criterion of the endangering currents.
• the course of the conductive current, investigated for the presence of the second frequency of the track circuit, which has assigned the second time window, is analysed in the analyser in such a manner, that after performing the time segmentation by the time window, the values of either all secondary-range partial amplitudes of actual values of the conductive current are stated, as well as the values of all respective secondary-range partial amplitudes of the actual values of the conductive current.
• the values of all secondary-range effective components i.e. the first secondary-range effective component, the second secondary- range effective component, up to the last secondary-range effective component of the endangering currents for the second frequency, are stated towards the reference phase network, i.e. towards the first reference phase, the second reference phase and up to the last reference phase.
• the first secondary-range effective component or the second secondary-range effective component or up to the last secondary-range effective component of endangering currents for the second frequency is evaluated as an above-limit value, if it has at one polarity, i.e. if it has the relevant phase, longer than the critical time an above-limit value, necessary for the excitation of the track receiver in terms of the criterion of endangering currents.
• the course of the conductive current is investigated for the presence of other frequencies of the track circuit up to the last frequency of the track circuit, which has assigned the last time window, and is analysed in the analyser so, that after performing the time segmentation by the last time window, the values of all the last- range partial amplitudes of the actual values of the conductive current are stated, as well as the values of all respective last-range partial phases of actual values of conductive current so, that the values of all last-range effective components, thus the first last-range effective component, the second last-range effective component, up to the last-range effective component of the endangering currents for the last frequency, are stated towards the reference phase network, i.e. towards the first reference phase, the second reference phase, up to the last reference phase.
• the first last- range effective component or the second last-range effective component or to up final last-range effective component of the endangering currents for the last frequency is evaluated as an above-limit value, if it has at one polarity, i.e. as far as it has the relevant phase, longer than the critical time an above- limit values, necessary for the excitation of the track receiver in terms of the criterion of endangering currents. If any effective component, i.e. none of the primary-range effective components for the first frequency, none of the secondary-range effective components for the second frequency, up to none of the last-range effective components for the last frequency of the track circuit, do not exceed at one polarity, i.e.
• the endangering current is indicated by the analyser as an under-limit value. It is also suitable, when the course of the conductive current investigated for the presence of the first frequency, the second frequency, up to the last frequency of the track circuit is analysed in the analyser so, that the presence of the first frequency, the second frequency, up to the last frequency is investigated by means of the first adaptive filter tuned to the first frequency, the second adaptive filter tuned for the second frequency, up to the last adaptive filter tuned for the last frequency.
• the values are stated of all partial amplitudes, i.e. the primary- range partial amplitudes, secondary-range partial amplitudes, up to the last- secondary partial amplitudes of the actual values of the conductive current, as well as the values of all corresponding partial phases, i.e. the primary- range partial phase, the secondary-range partial phase, up to the last-range partial phase of the actual values of the conductive current.
• the main advantage of the method of the phase-sensitive evaluation of the conductive current of the track circuit according to this invention is based on the fact, that there is the correct evaluation of endangering currents, i.e.
• the endangering currents must have not only the frequency in the relevant frequency band of the track circuit and the above-limit value of the amplitude, but mainly they must have the relevant phase, related to the reference phase at least during the critical period. Due to this fact there is not to an incorrect evaluation of those conductive currents, which are not endangering.
• Figure 2 shows an exemplary implementation of the reference phase network.
• Figure 3 shows an exemplary performance of the dependence of variable length of time windows on the individual frequencies.
• Figure 4 shows an exemplary implementation of segmentation of the conductive current by the first time window.
• Figure 5 shows an example of performance the criterion of endangering currents, with respect to the critical time and the above-limit value of the current.
• Figure 6 shows an example of implementation the criterion of endangering currents, with respect to the relevant phase.
• Figure 7 shows an exemplary implementation of the method of obtaining of frequencies of the track circuit by adaptive filters.
• Figure 8 shows an example of execution of time overlapping in the time segmentation with the use of the first time window.
• the method of phase-sensitive evaluation of the conductive current KP of the railway circuit KO is evident from the generalized schematic drawing of the basic execution, mentioned in Fig. 1 , then from the example of implementation of the reference phase network RFS according to Fig. 2, as well as from the example of performance the dependence of time windows CO on individual frequencies according to Fig. 3, also from the example of implementation of the segmentation of conductive current KP by the first time window 1CO according to Fig. 4, as well from the example of implementation of the criterion KR of the endangering currents OP with respect of the critical time KC and the above-limit value of the current according to Fig. 5 and from the example of the implementation of the criterion KR of endangering currents OP with respect to the relevant phase KRF according to Fig. 6.
• the values of all primary-range effective components US1, i.e. the first primary-range effective component 1US1, the second primary-range effective component 2US1, up to the last primary-range effective component PUS1 of the endangering currents OP for the first frequency IK, are stated towards the reference phase network RFS, i.e. towards the first reference phase 1RF. the second reference phase 2RF, up to the last reference phase PRF.
• the first primary-range effective component 1US1 or the second primary-range effective component 2US1 or up to the last primary-range effective component PUS1 of the endangering currents OP for the first frequency IK, is evaluated as above-limit, if it has at one polarity, i.e. if it has the relevant phase KRF, longer than the critical time KC and the above-limit value NH, necessary for excitation of the track receiver KPR in terms of criterion KR of the endangering currents OP.
• the first secondary-range effective component 1US2, the second secondary-range effective component 2US2, up to the last secondary-range effective component PUS2 of the endangering currents OP for the second frequency 2K are stated towards the reference phase network RFS, i.e. towards the first reference phase 1RF, the second reference phase 2RF, up to the last reference phase PRF.
• the first secondary-range effective component 1US2 or the second secondary-range effective component 2US2 or up to the last secondary- range effective component PUS2 of the endangering currents OP for the second frequency 2K is evaluated as above-limit value N, if it has at one polarity, i.e. if it has relevant phase KRF.
• a none effective component i.e. none of the primary-range effective components US1 for the first frequency ⁇ K
• the endangering current OP is indicated by analyser A as the under-limit value P.
• the method of phase-sensitive evaluation of the conductive current of the track circuit according to the invention is evident from the example of the implementation of the evaluation of relevant frequencies by adaptive filters according to Fig. 7, where the invention is implemented so, that the course of the conductive current KP, investigated for the presence of the first frequency IK, the second frequency 2K, up to the last frequency PK of the track circuit KO, is analysed in analyser A so, that the presence of the frequency K, i.e. the first frequency IK, the second frequency 2K, up to the last frequency PK, is investigated according to the first adaptive filter 1AF tuned to the first frequency IJK, the second adaptive filter 2AF tuned to the second frequency 2K, up to the last adaptive filter PAF, tuned to the last frequency PK.
• Such achieved values of signals regarding the first frequency IK, the second frequency 2K, up to the last frequency PK are used for specification of values of all partial amplitudes, i.e. the primary-range partial amplitudes 1PA, secondary-range partial amplitudes 2PA up to the last-range partial amplitudes PPA of actual values OH of the conductive current KP, as well as values of all respective partial phases, i.e. the primary-range partial phase 1PF, secondary-range partial phase 2PF up to the last-range partial phase PPF of actual values OH of the conductive current KP. It results from the schematic drawing of the basic variant mentioned in Fig.
• the reference phase network RFS is implemented in the mentioned example so, that the first reference phase 1RF has from the second reference phase 2RF and then next the equidistant phase angle of 30°.
• Fig. 4 there is an example of the implementation of the time segmentation of the conductive current KP by the first time window 1CO. It is displayed in the dependence of the conductive current KP on the time t.
• Fig. 6 shows an example of the implementation of the alternative manner of gathering of frequency K, i.e. the first frequency JNK, the second frequency 2K, up to the last frequency PK, by means of the first adaptive filter 1AF, the second adaptive filter 2AF up to the last adaptive filter PAF.
• Fig. 8 shows an alternative example of the implementation of the invention so, that in the time segmentation with the application of the first time window 1CO, the time overlap 1CP is used in high exposure parties of the analysed courses of the conductive current KP.
• variable time windows CO during the segmentation of the course of the conductive current KP by the time window e.g. by the first time window 1CO depending on the first frequency IK, the second frequency 2K, up to the last frequency PK, is based on the fact, that there is to a significant selective evaluation of endangering currents OP, than individual time windows CO, i.e. the first time window 1CO, the second time window 2CO, up to the last time window PCO, would have a constant value.
• the method of the phase sensitive evaluation of the conductive current KP of the track circuit KO can be used mainly during the analysis of conductive currents KP, generated by high-powered asynchronous railway units. This mainly concerns the case, when conductive currents KP, generated by railway units, could contain the endangering currents OP up to the above-limit value NH, which would cause a false and very dangerous excitation of the track receiver KPR of the respective track circuit KO.

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• Engineering & Computer Science (AREA)
• Automation & Control Theory (AREA)
• Mechanical Engineering (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Train Traffic Observation, Control, And Security (AREA)

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• 2005
  • 2005-08-05 CZ CZ20050497A patent/CZ2005497A3/cs not_active IP Right Cessation
• 2006
  • 2006-03-08 SK SK18-2008A patent/SK182008A3/sk unknown
  • 2006-08-03 WO PCT/CZ2006/000050 patent/WO2007016878A1/en active Application Filing
  • 2006-08-03 RU RU2008107682/28A patent/RU2369878C1/ru not_active IP Right Cessation

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