Voltage limiting device for DC traction systems

The HVL is a hybrid system composed by a metal-oxide (MO) surge arrester connected with two anti-parallel thyristors. The surge arrester limits the dangerous transient overvoltages from atmospheric discharges and switching. The thyristors trigger and limit the voltage in all cases with longer lasting overvoltages. The whole device is molded in silicone, designed and tested according to EN 50123-5 (IEC 61992-5) and IEC 60099-4.

Voltage limiting devices are used to prevent impermissible touch voltages in DC traction systems in normal operations and in fault conditions by bonding the return circuit of a DC railway system to the earthing system or to the exposed conductive parts.

Applications

• DC traction Systems

Why ABB?

• Over 75 years of experience in overvoltage protection and more than 25 years with silicone insulation
• Local and global ABB application support
• Proven safe short-circuit design
• Design life of more than 30 years
• Own production of metal-oxide (MO) resistors
• Long term stable under system conditions
• Proven safe short-circuit design
• Mechanically strong design
• UV resistant silicone housing with excellent pollution performance
• Maintenance free