railway electrical protection and train warning
Time:2016-12-21 From:

Industry understanding:

  private network is wireless communication system of railway bureau, public works, electricity supply, passenger, station indispensable important communication tool, clear in time the wireless communication is an important guarantee of safe operation and safe operation of the train. Kelly electronic railway departments are faced with the difficult and the demand, for the different scenarios to tailor the application of different department of communications solutions, improve the efficiency of the industry user management and operation safety coefficient, standardizes the staff operation specification.

Railway electric train early warning and protection solutions
in order to ensure the timely and effective railway freight, passenger transport, our railway public works, electricity, power supply department staff must ensure that, rail tracks, the normal work of the signals, crossings, and so on, in the daily construction protection, must have a set of reliable and timely wireless communication system as a guarantee.

Survey
public works, electricity personnel needs, all the year round in along the railway of railway maintenance, inspection, maintenance, with the acceleration of national railway, the train speed is accelerated, and the train of along the railway works construction personnel security caused great threat. How to deal with the train speed brings the threat of the personal safety of construction personnel and maintenance personnel to maintenance the contradiction between railway guarantee the normal operation of the train is what we need to solve the problem.
At present, the railway maintenance personnel adopted by the technical means is: when a team need to road construction. Need to set up in railway station station protection, at the same time set up in 800 meters before and after the construction site safety measures. When the train near by the station protection notice in fixed bed scene protection personnel, by field protection notice construction personnel again next.
Through the various stations of the whole railway network of research, we found that still exist the following problems:
1, the part of the interval is longer, stand with an unobstructed field of wireless communications: site protection cannot call station personnel, or need to multistage liaison in the middle;
2, signal easily interfere with each other (in the adjacent two work area construction at the same time, communicate each other easily crosstalk);
3, and cannot inter-district scheduling communication (for remote site to the remote communication);
4, work area and rotary table maintenance and management is not standard, not graceful degradation mechanism, timely communication can not meet an emergency.
5,Tunnel, tunnel call distance less than 500 meters, inside and outside the tunnel cannot exchange.
6, communication, public works and the work area there is no unified command scheduling management functions, not unified management, unified operation, wireless intercom lack of scientific management specification.
7, train early warning is not flexible, voice is not clear, not timely complex operation and so on.

The solution described
Kaili according to user requirements, combined with the national policy to the private network for analog to digital switching to meet along the railway departments and so on public works, electricity, power supply and vehicle along the homework, protective contact communication and daily scheduling communication needs tailored to a set of digital IP interconnected system, based on the digital radio communications products, to the railway network as a bridge, using existing foundation bathed, construction of a new digital radio communication network, system construction according to the following principles:
1, digital IP interconnection system in railway construction, each paragraph according to the scope of their jurisdiction and terrain through actual measurement to determine the required number of base stations, general with 7 to 10 kilometers it is advisable to build a base station;
2, each station along the railway engine room, tower and link, link to meet G.. 703 standard E1 line or railway internal IP link;
3, all connected to the base station to form into a separate subnet, terminal grouping configuration, in order to meet the public works, electricity, power supply and vehicle four independent department communication;
4, railway administrations, configurable cable segment and workshop scheduling platform, in order to realize the remote call, recording and monitoring, easily implement cross-sectoral call, unified command scheduling.
5, station equipped with a vehicle for the use of station attendant or station liaison.
6, train equipped with digital vehicle, intermittent warning information;
System is completed, the base station can be a separate group, daily work, each work area business departments are independent of each other, when necessary by dial-up terminal for cross-site under way with other stations or cross-sectoral call, while other irrelevant personnel department response. Terminal in the full automatic roaming, locomotive vehicle station with automatic intermittent cycle way from train services, running speed, position and the function of the train running information such as time, walkie-talkies and other locomotive vehicle station has the function of receiving train close to early warning information.

Network topology:

This scheme adopts the technology of the IP network and PDT digital signaling, effectively solve the seamless coverage of a wide range of communication problems along the railway, implements the management of mobile terminals and the digital recording and querying all calls. The system can better separate the constructed by electricity, public works, to unified dispatching command, fast construction mission, motor, reasonable distribution of each work area. And in a sudden accident occurs, the period of center can each workshop scheduling, ensure that the minimum time to allocate the limited manpower and material resources, make whole hub greatly improve work efficiency.

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