Voltage limiters

Limitatore di tensione

Voltage limiters


The voltage limiting devices were introduced to avoid that, due to leakage currents through the insulators, the pole itself leads to voltages towards the local earth so high to constitute a danger.
A "bidirectional" version was also introduced, the additional purpose of this device was to prevent the tracks from reaching too high voltages that could be dangerous or induce damage (corrosion).

Categorical
CAT FS 779/005 categorical SECOM code 110470R228
Unidirectional device
From the rail to the pole
Direct current 160A
Direct current T=60s 500A
Maximum reverse voltage 2800V
Maximum direct voltage drop 5Vdc
Trigger treshold 150Vdc
Protection (against atmospheric discharges) Varistor
CAT FS 779/006 categorical SECOM code 110470R128
Bidirectional device
same characteristics of the unidirectional device, adding
From the rail to the pole
Direct current 400A
Voltage drop 2Vdc
CAT FS 779/007 categorical SECOM code 110785R1002
Bidirectional device with redundancy three of the trigger circuit and diode fault signal
Diode direct current 600A
Reverse voltage 2kV
Scr direct current 300A
Scr current for 10s 2500A
Trigger treshold 120V
Varistor protection with short circuit breakage and current not less than 50kA
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