IEEE Electrification Magazine - September 2016 - 47

Reference
Cases

Reference Scenarios with Train
Simulation at 2 × 25 kV ac Section
100 Ampere ac

Track Insulating Joints
JST

50 Hz Current Measured at
3 kV dc Line Track (A)

JST and JF Bypassed, JB in Service

0,28

JST, JF and JB Bypassed

1,96

JST in Service, JB and JF Bypassed

1,51

JST and JB Bypassed, JF in Service

0,05

JST and JF in Service, JB Bypassed

0,02

JST, JF and JB in Service

Key
JST: Track Insulating Joint at ST

Negligible

JB : Track Insulating Joint at Border Post

JF : Track Insulating Joint at Filter

Figure 8. A summary of the disturbance reduction effect compared with the provision taken.

xx
The ST limits efficiently the ac current injected into

the dc line and the current injected into the earth.
xx
The combined effect of the presence of the ST and

the filter provides a satisfactory limitation of the disturbing current injected into the dc system through
the rails and the contact line.
xx
The ST also provides considerable reduction of the dc
current that could enter in an ac system when trains
coming from 3 kV dc systems run on insulating joints.

Biographies
Fabrizio Caracciolo (f.caracciolo@rfi.it) graduated in 2004
from the University of L'Aquila, Italy. Since 2006, he has
been an electrical engineer at Italian Railways, Rome. He
contributed to the activation of the Italian high-speed network and performed many field tests in electrical traction
installation at both 3-kV direct currents and 25-kV alternating currents. He currently manages both laboratory and
onsite electric tests for railway installations and devices.
He is the author of articles on railway power systems at
the national and international levels. He is the secretary for
the International Union of Railways Energy and Electric
Traction Experts Group. He is the chair of the European
Committee for Electrotechnical Standardization SC9XC
WG14 and a member of several TC9X Working Groups.
Alvaro Fumi (a.fumi@rfi.it) graduated with honors in
1973 from the University of Rome, Italy. Since 1975, he
has been an electrical engineer at Italian Railways,
Rome. An expert on planning, building, and maintaining rail installations, he contributed in 1976 to the

activation of the first Italian high-speed line from
Rome to Florence (250 km/h at 3-kV direct current) and
is now involved in testing the new high-speed lines
(300 km/h at 25-kV alternating current). He coordinated
and promoted all of the investigations on the electromagnetic interferences caused by the new 25-kV traction installations on the existing lines. He is the author
of a technical book and of many technical and scientific articles published in national and international journals. He is the chairman of the European Committee
for Electrotechnical Standardization Subcommittee
SC9XC Railway Applications-Fixed Installations.
Enrico Cinieri (enrico.cinieri@fastwebnet.it) received
his M.S. degree with honors in electrical engineering
from the University of Rome, Italy, in 1971. He was a
researcher in 1973 and an associate professor of power-generating plants in 1983 with the Department of
Electrical Engineering, University of Rome. From 1986
to 2011, he was a professor of applied electrical engineering at the University of L'Aquila, Italy. In 2012, he
was appointed a member of the Academy of Sciences
of Abruzzo, Italy. He is the author of articles on powersystem analysis, high-voltage power transmissions,
overvoltage and insulation coordination, and electric
traction systems. He is a member of the Italian Railway Engineers Association and the European Committee for Electrotechnical Standardization SC9XC and
the president of the Italian Electrotechnical Committee Subcommittee 9C Railway Applications-Fixed
Installations. He is a Senior Member of the IEEE.

IEEE Elec trific ation Magazine / S EP T EM BE R 2 0 1 6

Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2016