Research On The Onboard Auto-test System For
Track Circuit Compensating Capacitors
Author(s)
H. Zhao, Y. Liu & B. Liu
Abstract
A kind of onboard auto-test system was proposed so as to detect the track circuit
compensating capacitors in real time. The system model and design were based
on the resonance current detection method. The data acquisition card generated
the actuating sine signal first, which was amplified and coupled onto the rail.
Two wheels of the test vehicle, rail lines between and the capacitor connected
between the rails formed a closed LC loop. If the actuating signal frequency
coincides with the inherent resonance frequency of the loop, a reactive current
will be produced within the loop. After the current is sampled and further
processed, the capacitor value can be estimated. The system principle and
architecture are described in detail. Experiments show the invalid capacitors can
be efficiently detected and located in real time.
Keywords: resonance current detection method, compensating capacitor,
onboard auto-test system, track circuit, data acquisition.
1 Introduction
Audio frequency jointless track circuits, i.e. UM71 and ZPW-2000A, are now
widely used in the railway autoblock systems in China. As for ZPW-2000A, rail
lines act as the transmission media for dedicated FSK signal which carried the
vital autoblock information used for train control. Modeled as a kind of
distributed transmission line with inductive characteristic impedance, rail lines
are not a good transmission media for audio frequency, unfortunately. In order to
weaken the negative effect of the inductive rail and prolong the transmission
length of track circuit, compensating capacitors are evenly spaced and installed
between the rail lines, as shown in Fig. 1.
Keywords
resonance current detection method, compensating capacitor,
onboard auto-test system, track circuit, data acquisition.
Related Book
Other papers in this volume
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