28-11-2012, 02:23 PM
Central Electronics Limited
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SOLAR PHOTOVOLTAIC GROUP (SPV):
CEL, backed by an integrated production facility, has opened up new horizons in the field of Solar Photovoltaic. It fulfills the various demands from rural & urban areas, thus, harnessing the solar energy. The products of this division are Solar Cells, Modules and systems, which serve the industrial needs of Railway Signaling, Microwave Repeaters, Defense equipments, Obstruction warning lights at airports, etc. and rural needs such as pumping systems for irrigation, street lighting systems, solar lanterns and rural telecommunications.
ELECTRONIC SYSTEMS GROUP (ESG):
The Company is a pioneer in manufacturing of Railway Signaling and Safety Equipments. It manufactures Axle Counters, Railway Level Crossing Warning System, and Solid State Interlocking System for Railways. The other products of this division include Electronic Switching System, Cathode Protection System for underground pipelines and VSAT.
NATION’S PIONEER & WORLD LEADER IN SOLAR PHOTOVOLTAIC
In an era of growing energy needs and rising concern for environment, solar energy, the abundant and pollution free non-conventional energy source, offers the best alternative solution.
CEL, with its commitment to harness the solar energy, has opened up new vistas in the field of solar photovoltaic; CEL is the poignant and the largest producer of solar photovoltaic.
Backed by an integrated production facility, CEL has made accumulative supply of over 0.15 million SPV systems (20 MW) spread over 28 different types, covering both rural and industrial applications. The company has not only given a fillip to the Indian SPV market but also exported products to Indonesia, Bhutan, Bangladesh, Egypt, Cuba, Nepal, Mali, Columbia and Costa Rica.
CEL has successfully transferred technology for manufacturing SPV Modules and Systems to Rajasthan Electronics & Instruments Ltd. India in 1985 and very recently to Scientific Studies and Research Center (SSRC), Syria in May 1997. This is the first case of SPV Technology Export from the Developing World.
Signaling & Safety Systems for the Indian Railways :-
CEL is the pioneer Public Sector Company supplying Railway Signaling and Safety equipments to Indian Railways.
CEL continually identifies new requirements of the Railways and develops / manufactures the same in association with Research, Design and Standards Organization (RDSO) and Railway Board.
The Company is currently engaged in development of Digital Axle Counter in association with RDSO and Department of Scientific Industrial Research (DSIR).
The product is undergoing extensive field trials in different zones of Indian Railways and software validation is under progress. The product is expected to be deployed in Indian Railway‟s Signaling network in large numbers by the end of year 2002.
INTRODUCTION
Axle counters were developed as a substitute for track circuiting. Initially axle counters were imported from Germany to gain experience and to evaluate their suitability for adoption on Indian Railways. Having gained acceptability for introduction on a wide scale on Indian Railways, it was considered to take up indigenous development of axle counters, which was taken up in collaboration with IIT, Delhi and DOE. Two models of axle counters known as single entry/exit axle counter and multi entry/exit axle counters emerged and after extensive laboratory and field trials under various conditions, the design was finalized and commercialized through private sector as well as public sector.
Based on the feedback from field, a new axle counter has been developed by RDSO, known as “UNIVERSAL AXLE COUNTER”.
NEED FOR AXLE COUNTERS :
The track circuits are considered as the vital components of signaling system to achieve safety of train operations. Various Accident Enquiry Committees have recommended bringing more and more tracks under track circuiting to safeguard against reception of trains on occupied lines. The track circuiting could not achieve desired progress due to virtual scarcity of wooden sleepers, prohibitive cost and environmental consciousness in the country and the world at large. Availability of concrete sleepers have solved the problem to some extent but track circuiting on loop lines, points and crossings still suffers for want of adequate supply and insertion of concrete sleepers.
PRINCIPLE OF OPERATION
Signal aspect for train movement is controlled based on clear or occupied status of the track section. If a train occupies the track section, signal at the entry point of the section is made RED and the next train is stopped from entering into the section. When the track section is clear the signal is made GREEN and the train is allowed to proceed into the section.
The clear or occupied condition of the track section is decided by Axle Counter by counting the number of axles of train at entry and exit points of the section. The axle counter compares the IN and OUT counts and in case of count equality TRACK CLEAR signal is given. In all other conditions TRACK OCCUPIED signal is given.