New types of low voltage limiters Type 1 VLD-F based on requirements of EN 50122-1: 2011, which are designed to protect the non-live parts of metallic structures in DC ev. AC traction power supply systems. They are used to effectively protect persons who may come into contact with these parts during lightning strikes or a defect of the tractive overhead line. The limiter has a high internal resistance when voltage on it is less than the nominal level its spark over voltage UVDC and becomes conductive when this level is exceeded. In case of failure arising from a contact between live parts of the power system and traction conductive portion unintentionally associated with return path limiter protects illegal contact voltage that becomes conductive and causes the power is turned off. According to EN 50122-1: 2011, this type of limiter is recommended primarily for connection between the protected area and return circuit in overhead line areas (or pantograph areas) that may be in contact with live conductors or damaged current collector, then the support structures pylons which can become live due to a fault isolation. After re-applied voltage drops below of its nominal level spark over voltage UVDC the limiter returns to the non-conducting state again.
Power gas discharge tube (GDT) designed for potential equalisation on the installation components of buildings or technological units, which are not electrically connected to each other (according to EN 62305: 2011). It is recommended primarily for bridging of insulated flanges and insulated threaded joints in the pipeline cathodic protected parts of industrial technology.
Railway-News magazine issue 3 2021: Acer Voltage – Low-Voltage Limiters for Railway Vehicles in DC Systems.
ACER VOLTAGE develops and supplies surge arresters and overvoltage limiters for the protection of LV and HV power distribution networks.
The portable tester – designed for quick control of SPD containing metal oxide varistors and gas-filled surge arresters (GDT).
Protection of DC traction system, rail traction vehicles and equipment against atmospheric and switching overvoltage in DC systems.
Protection of high voltage transmission systems, transformers, switching equipment and HV cable systems against overvoltage in AC systems.
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