Catenary de-icing in HS Lines Fabrizio, CARACCIOLO Technical - - PowerPoint PPT Presentation

“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

2 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

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.

3 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

Italian HS electric traction system

4 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

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

5 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

• Power installed

2 MW/km

• HV feeding

150 kV

• ESS distance

48 km

• OCL section

270 mm2

• Contact wire

120 mm2

• OCL height

5.30 m

Italian HS electric traction system

2 x 25kV - 50 Hz

Italian HS electric traction system

6 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

ENEL RONDISSONE ENEL MAGENTA

POC SETTIMO T. (km 2+250) PPS SETTIMO T. (km 2+491) PPD BRANDIZZ O(km 9+751) SSE CHIVASSO (km 20+481) PPD CIGLIANO (km 29+500) POC VERCELLESE O. (km 1+582 BP km 2+341 BD) PPD ALICE C. (km 41+874) PPD CARISIO (km 53+500) SSE GREGGIO (km 65+874) SSE CHIVASSO SSE GREGGIO PPD NOVARA

• O. (km

77+175) POC NOVARA O. (km 1+275 BP km 1+269 BD) PPD NOVARA EST (km 88+871) PPD BERNATE (km 101+837) SSE SEDRIANO (km 111+950) POC RHO (km 118+152)

TORINO MILANO

PPS RHO (km 117+210)

An example of normal setting of electric traction system (Turin - Milan HS line)

7 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

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)

Special electric de-icing setting

8 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

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)

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).

9 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

De-icing technique principles

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560,00 580,00 600,00 620,00 640,00 660,00 680,00 700,00 720,00 740,00 20 40 60 80 100 120

Proper setting of thermal protection relay

Current (A) (min)

Winter setting Summer setting

Impedance relays protect catenary both in normal and in de-icing operating status. Line thermal protection relays need to be set for de- icing scope (usually for all the winter time).

Results achieved

11 Fabrizio, CARACCIOLO - Rete Ferroviaria Italiana, Italy - July 8 - Session 4: Technology No40

h (cm)

5 10 15 20 25 30 35 40 45 0:00 0:02 0:04 0:07 0:09 0:11 0:13 0:15 0:17 0:19 0:21 0:26 5 10 15 20 25 30 35 40 45 0:26 0:31 0:36 0:41 0:45 0:47 0:49 0:52

De-icing Current (A) Conductor lenght (m) h counterweight (cm) t contact wire (°K) t messenger wire (°K) 704 1300 42 10 12

Termal effects per every cycle de-icing on the OCL

t (h)

One or more cycles of less than 1 hour during the night traffic interruption avoid the ice accretion at the morning circulation restarting

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.

12

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

...Thank you

for your kind attention

Credits

• A. Fumi, E. Cinieri, F. Caracciolo, C. Spalvieri

f.caracciolo@rfi.it +393138063583