An Introduction to the Principles and Composition of 25hz Phase Sensitive Orbital Circuits 3V

Abstract

At present, the number of China's railway mileage has exceeded 159,000 kilometres, electrification mileage is soaring, more than 90% of the stations use 25hz phase-sensitive track circuits,and, in practical application, the 97-type 25hz phase-sensitive track circuits as well as the JXW25 microelectronic track circuits occupy an important position, and they have many significant characteristics, such as: stable operation, easy maintenance, low failure rate. It also has strong impact resistance, which makes the railway development in China achieve remarkable results. Due to its effectiveness and reliability, it has been commonly used in practical situations. China's railways are moving towards greater standards and sophistication, which has led to an increase in traffic and an expansion of stations. Where there are cross crossings, there are unenergised branches in the track circuits, and here the trains on the track are very sparse. Due to oxidation of the track surface, the track circuits in these places are prone to poor branching leaving white light band faults. To solve these problems, we used a 25hz phase sensitive track circuit measurement software system and by analysing the data, we determined that raising the 25hz impedance of the choke transformer could help the track voltage. By changing the voltage, we were able to dramatically improve the superposition of the codes, so we chose the BG3(3)-L130/25 lightning protection track transformer to replace the original track transformer. In addition, we also chose the BGK-130/25 type reactance track transformer. In this way, we are able to ensure the safety of track circuit work and avoid accidents. By introducing QT-25 type phase regulator, we can significantly improve the phase performance of the track relay coil so as to achieve good stability. At the same time in the field of daily maintenance and centralised maintenance, does not affect the original 25hz phase-sensitive track circuit testing and maintenance methods, conducive to the field maintenance personnel daily maintenance and test data.