OHE Anti-theft Charging General Guidelines PDF

GENERAL GUIDELINES FOR ANTI-THEFT CHARGING OF OHE 8.0 General 8.0.1 In the theft prone area the energization of OHE at 2.2kV as an anti-theft measure may be done to avoid theft of contact / catenary wire. As energization at 2.2kV is purely for the purpose of arresting the thef...

GENERAL GUIDELINES FOR ANTI-THEFT CHARGING OF OHE 8.0 General 8.0.1 In the theft prone area the energization of OHE at 2.2kV as an anti-theft measure may be done to avoid theft of contact / catenary wire. As energization at 2.2kV is purely for the purpose of arresting the theft of catenary and contact wire and not for train operation, it is not likely to produce any inductive interference affecting signalling and telecom. Installations due to practically no current flowing in the circuit. Therefore, even though certain works like erection of isolators and section insulators, installation of SWS, BTs, ATs adjustment of OHE, SED checks, tower wagons checks, provision of CLS Telecom cabling etc are not completed in all respects, OHE can be charged at 2.2kV. 8.0.2 Period of anti-theft energization will be restricted at night hours only i.e., from 7PM to 7AM 8.1 Works to be completed prior to 2.2kV Energisation 8.1.1 The following works are essentially required to be completed prior to 2.2kV anti-theft energisation of OHE. 2. Provision of structure bonds in open route and structure and rail-bonding in station areas in accordance with the bonding and earthing code. In station areas where Bonding and Earthing work has not been completed, the return conductor (RC), if provided, may be used as earth wire and connected solidly to the OHE structures / supports by means of suitable jumpers. At both the ends of the station, RC shall be connected to rails. 3. All necessary LT modification works. 4. Necessary modification to all HT crossing to meet at least the requirements for 2.2 kV as per the standards laid down. 5. Provision of wire mesh screen on the working platform of existing semaphore signals in case the requisite electrical working clearance of 2 m is not available. No portion of the signal post or its fittings shall be less than 700 mm from the live conductor. 6. Replacement of existing dc track relays by ac immunized relays. 7. Conversion of all tracks crossings of communication lines into cable and removal of overhead wires thereof. 8. Provision of height gauges and 25kV caution boards at all level crossings. 9. Provision of protective screens with 25000 V caution boards on over line structures like ROBs, FOBs, Fly Overs etc. 10. Provision of Public Warning boards for 25000 and shock treatment chart and First-Aid Boxes at all relevant places like stations, cabin buildings, repeater stations, cable huts etc. 11. Supply of insulated fools to maintenance staff. 12. Modification to carriage watering arrangements and water columns to suit anti- theft energization. Over Head Equipments Page 149 8.1.1 All the relevant rules and precautions in accordance with the Indian Electricity Rules should be compiled while carrying out the works. 8.2 22kV Power Supply arrangement 8.2.1 22 kV energization will be done through local supply available at one of the stations through a step-up transformer provided with fuse of suitable capacity with an audible and visual indication arrangement. A schematic Diagram indicating the power supply arrangement and the controls and scheme of connection for supply of power at 22 kV shall be prepared and submitted to EIG for his approval. 8.2.2 The 22 kV supply arrangement will be manned round the clock by RE. The organization to be available for manning the feeding installation and duties of the staff and ASMs in case of both normal operation and breakdown / abnormal operation shall be detailed out and issued in the form of a circular. 8.2.3 As stated in Para 1.2 above even though the OHE will be normally kept energized during night, the OHE in the energized section shall be regarded as live at all the times and consequently dangerous to human life. No person except those deputed to work on or near the overhead electrical equipment and who are in possession of a ‘Permit to Work’ issued by an authorized representative of Re, shall approach within 2m from the OHE. 8.2.4 A joint procedure order indicating the detailed procedure to be followed for taking power block and issue of ‘permit to work’, for issuing notices to drivers, for attending to breakdowns shall be made out and issued to all concerned. This order will be signed jointly by the concerned officers of both RE and Division. 8.3 Procedure to be Adopted for Energization 8.3.1 Publication and display of Notices 1. Atleast a month in advance of energization of any section or sections the following public notifications should be got published in all the prominent dailies in English, Hindi and Local language and issued to all concerned as normally done for 25 kV energisation. (i) General Notification to the users of Railway Lines regarding section/sections to be energized. (ii) Notification to the users of level crossings. 2. Display of general caution notices for public and staff at prominent places at each station, stenciling on the diesel / steam locos warning message to not to climb on the op of locos, caution notices at all steam and diesel loco sheds at which locos working in the energized section are maintained. 3. The steam/diesel loco drivers / firemen shall be warned not to climb on the roof of the tender and the engine on the section proposed to be energized. Over Head Equipments Page 150 8.3.2 On completion of the work as mentioned in Para above the following certificates from the concerned officers will be obtained. (i) Certificate regarding removal of L.T and H.T infringements by Dy.CEE(G) of the project. (ii) Certificate regarding S&T works (iii) Department of Telecommunications (DOT) clearance certificate for 2.2 kV anti-theft energisation. (iv) Certificate by Dy.CEE(OHE) or DEE(OHE) regarding completion of OHE works. (v) Certificate by OHE Contractors. (vi) Certificate by Dy. CE?DEN/RE regarding provision of level crossing gauges and provision of protective screens on ROBs and FOBs. 8.3.3 Besides the certificates regarding completion of works to suit 2.2 kV energisation as mentioned in Para above, the following safety certificates shall also be obtained: (i) Joint certificate by CEE(P), CSTE(P) AND CE(P) regarding safety to traffic. (ii) Certificate of concerned officers of Division of particular Railway about knowledge of their staff regarding safety. 8.4 EIG Sanction An application to EIG seeking his approval to the proposal of energisation of OHE at 2.2kV as anti theft measure may be made in advance. While applying for sanction, the up to date status of works to be completed prior to 2.2 kV energisation should be given and the list of certificates for its completion as well as other safety certificates proposed to be forwarded at the time of seeking EIGs formal sanction may also be indicated. EIGs sanction shall be obtained prior to energisation. 8.5 Checks and Tests Prior to Commissioning: 8.5.1 CEE and Electrical Inspector to the Government for the Railway may nominate at his discretion one of his officers preferably Sr. DEE (TrD) for joint check and tests of the section proposed to be energized. For such joint check by Dy. CEE(OHE)/ RE will associate from RE side. Alternately he may authorize Dy. CEE(OHE)/RE to conduct checks and tests before energisation. The following checks and tests shall normally be carried out. 8.6 Checks 1. That clearance between live and earthed structures is in accordance with the provisions of Schedule of Dimensions. 2. That earthing and bonding of the OHE have been carried out as per Bonding and Earthing code with exception for station area as specified in para 2.1.2 above. 3. That height of contact wire at level crossings is proper and that height gauges have been provided. 4. That protective screens have been provided in FOBs, ROBs and signalling structures. 5. That the earthing and isolation of overhead equipment adjacent to the section to be energized has been carried out properly. 6. ac immunized track relays have been provided. 7. Overhead P&T as well as Rly crossings have been cabled and wire removed. Over Head Equipments Page 151 8.7 Tests 1. Megger tests for continuity and insulation of the OHE. 2. With the above checks and tests and after it is certified either jointly by Sr. DEE(TrD) and Dy. CEE(OHE) / RE or by Dy. CEE (OHE)/RE that the section can be energized at 2.2kV for test purpose, the following fault tests shall be conducted on the section energized at 2.2kV. a) By creating earth fault at the farthest end of energized OHE through discharge rod. b) By creating earth fault at the farthest end of energized OHE touching only ballast. c) By creating earth fault at the farthest end of energized OHE touching only rail. In all these cases of earth fault, it should be ensured that fuse provided at the supply point is blown. 8.8 Immediately on the successful completion of the checks and tests of the OHE, OHE can be energized provided that: a) All the certificates as mentioned in paras 8.3.2/3 above are obtained. b) DOT’s clearance and EIG’s sanction are obtained. 8.9 Immediately after energisation, a notification to that effect may be issued as normally done for 25 kV energisation. Over Head Equipments Page 152