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About Iran

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:: Control and Signaling Lab ::

  Control and Signaling Lab

The lab is equipped with high-tech electronic devices to train BSc and MSc students. Various types of control and signaling devises like interlocking systems, axle counter system, control devices of rail joints,… are available. The lab is directed to conduct research and implementing new control logics in this area.

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  Relay Interlocking System

Interlockings affected purely electrically consist of complex circuitry made up of relays that ascertain the state or position of each signal appliance. As appliances are operated, their change of position opens some circuits that lock out other appliances that have would conflict with the new position. Similarly, other circuits are closed when the appliances they control become safe to operate. Students are trained to deal with a Relay Interlocking System for a 3-lined crossing at grade.

 

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   Double-track axle counter system

 

An axle counter is a device on a railway that detects the passing of a train in location of the more common track circuit . A counting head (or 'detection point') is installed at each end of the section, and as each axle passes a head at the start of the section, a counter increment. As the train passes a similar counting head at the end of the section, that counter decrements. If the net count is evaluated as zero, the section is presumed to be clear for a second train. Students are trained to deal with operation and errors of a double-track axle counter.

 

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  Computerized Interlocking System

Modern interlockings — those installed since the early 1990s — are generally solid state , where the wired networks of relays are replaced by software logic running on special-purpose control hardware. The fact that the logic is implemented by software rather than hard-wired circuitry greatly facilitates the ability to make modifications when needed by reprogramming rather than rewiring. Students are trained to deal with a Computerized Interlocking System for a various types of crossing at grade. Students are able to implement new control logics, design new arrangements and simulations of various types of grade crossings.

 

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