“Catenary de-icing in HS Lines” Fabrizio, CARACCIOLO Technical Department, Rete Ferroviaria Italiana, Italy Wed July 8, Session 4, Technology A/4A: Maintenance (No.40)
Content Introduction Italian HS electric traction system De-icing technique principles Results achieved Highlights of the technique adopted Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 2
Introduction to icing phenomena Ice accretion on the overhead contact lines may cause severe inconveniences for the pantographs current collection with disturbances to the train traffic. To avoid these problems in HS lines, the Italian Railways are applying successfully a special technique of electrical de-icing. Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 3
Italian HS electric traction system HS lines placed into service – Time frame Rome - Florence (1976*) Rome-Gricignano (dec 2005) Turin - Novara (feb 2006) Bologna – Milan (dec 2008) Bologna - Florence (dec 2009) Novara - Milan (dec 2009) Gricignano - Neaples (dec 2009) Neaples - Salerno (dec 2011**) Bologna HS station (dec 2012) * 3kV dc ** speed up Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 4
Italian HS electric traction system 2 x 25kV - 50 Hz • Power installed 2 MW/km • HV feeding 150 kV • ESS distance 48 km • OCL section 270 mm 2 120 mm 2 • Contact wire • OCL height 5.30 m Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 5
Italian HS electric traction system SSE CHIVASSO ENEL SSE (km RONDISSONE GREGGIO 20+481) TORINO POC SETTIMO POC T. VERCELLESE PPS PPD PPD PPD PPD (km 2+250) O. SETTIMO BRANDIZZ CIGLIANO ALICE C. CARISIO (km 1+582 BP T. O (km (km (km (km km 2+341 BD) (km 2+491) 9+751) 29+500) 41+874) 53+500) PPS RHO (km MILANO 117+210) POC POC RHO NOVARA O. (km 118+152) (km 1+275 BP PPD PPD PPD km 1+269 BD) NOVARA NOVARA EST BERNATE O. (km (km 88+871) (km 101+837) 77+175) SSE SEDRIANO (km 111+950) SSE ENEL SSE CHIVASSO MAGENTA GREGGIO (km 65+874) An example of normal setting of electric traction system (Turin - Milan HS line) Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 6
Normal electric traction setting How the electric scheme changes from the normal setting for traction (above figure) to the special setting for de-icing (next figure) Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 7
Special electric de-icing setting De-icing setting of electric traction system. Line fed by one substation via two power transformers connected to HV grid with phases shift of 60° (voltage level and circuit length determine de-icing current value) Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 8
Highlights while de-icing is setting up Selection of the best configuration of the installation as a function of the line length; adequate phases selection from HV grid; adoption of proper set of value for line thermal protection relay as a function of back up timer; no additional apparatuses installation is required; set up in the control centre a proper automated procedure for configuration of installation; Adoption of proper time duration for de-icing procedure (typically 50-60 min). Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 9
De-icing technique principles Proper setting of thermal protection relay Current (A) Impedance relays protect 740,00 catenary both in normal and 720,00 Winter setting in de-icing operating status. 700,00 680,00 Line thermal protection 660,00 relays need to be set for de- 640,00 icing scope (usually for all 620,00 the winter time). 600,00 Summer setting 580,00 560,00 0 20 40 60 80 100 120 (min) Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 10
Results achieved Termal effects per every cycle de-icing on the OCL h (cm) 45 45 40 40 35 35 30 30 25 25 20 20 15 15 One or more cycles of less than 1 hour 10 during the night traffic interruption avoid the ice accretion 10 5 at the morning circulation restarting 5 0 0 0:00 0:02 0:04 0:07 0:09 0:11 0:13 0:15 0:17 0:19 0:21 0:26 0:26 0:31 0:36 0:41 0:45 0:47 0:49 0:52 t (h) h t t De-icing Conductor Current lenght counterweight contact wire messenger wire (A) (m) (cm) (°K) (°K) 704 1300 42 10 12 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 11
Highlights while de-icing is ongoing Circulation in the overhead conductors current of such an intensity as to allow de-icing of the OCL in bad weather conditions; any unacceptable temperature conditions are recorded for the line conductors and for the singular points of the line (joints, contacts of the switchgears, etc.); OCL continues to be protected by the impedance protections without any change in the setting; the adoption of the de-icing technique does not require additional apparatuses; the configuration of the circuit is performed from the control centre with an automatic procedure. The adoption of this technique avoids easily the ice accretion on the OCL, during the winter nights, increasing the infrastructure availability and the train traffic regularity at low costs. Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40 12
...Thank you for your kind attention Credits A. Fumi, E. Cinieri, F. Caracciolo, C. Spalvieri f.caracciolo@rfi.it +393138063583
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