Method of adjusting track and reference voltages for feeding two-phase parallel track circuits for railway

摘要

The execution of the invented method of adjusting track and reference voltages for feeding parallel track circuits for railway in order to increase resistance thereof to endangering effects being generated predominantly by emissions of endangering currents of powerful electrical units and driving vehicles with asynchronous motors, where endangering voltage component (OSN) gets into a track circuit (KO) due to the endangering effects (OV), is characterized in that track voltage (UK) is mathematically analyzed in a first channel receiver (KP1) up to the m-th channel receiver (KPM) relative to a reference voltage (RN) and simultaneously, there is evaluated a freedom of a track section (KU) inclusive of emergency conditions of the track circuit (KO), or occupancy thereof with a rail vehicle (KV), based on amplitude and phase angle of the track voltage (UK) relative to the amplitude and phase angle of the reference voltage (RN). Subsequently, freedom of the track section is determined by the evaluation of a first output (V1) of the first channel receiver (KP1) up to m-th output (VM) of the m-th channel track receiver (KPM) in a unit (JVV) of the output evaluation using the method two of two up to two of m channel outputs (V1, V2, VM). In order to generate the track voltage (UK), there is generated in a modified voltage source (ZUN) a modified voltage (UN) for generation of the track voltage (UK). At the same time, there is generated the reference voltage (RN) such that these voltages (Un, Rn) have, according to the first embodiment variant, a constant phase shift (+ phi) relative to each other having positive value of the phase shift angle (+phi) = 90 degrees, optionally an immediately close value thereof. The phase angle {alpha} of the modified voltage (UN) changes in cycles continuously within the range of 90 degrees to 270 degrees and from 270 degrees to 90 degrees, preferably from 110 degrees to 250 degrees and from 250 degrees to 110 degrees, in a predetermined time interval (tiz), which corresponds to units up to hundreds of frequency periods, on which frequency the track circuit operates (KO), for example 75 Hz, optionally 275 Hz. The phase angle {beta} of the reference voltage (RN) changes in cycles continuously within the range of 180 degrees to 360 degrees and from 360 degrees to 180 degrees, preferably from 200 degrees to 340 degrees and from 340 degrees to 180 degrees, optionally the phase angle {-beta} changes in cycles continuously within the range of 0 degree to 180 degrees and from 180 degrees to 0 degree, preferably from 20 degrees to 160 degrees and from 160 degrees to 20 degrees.