Voltage Limiting Device

Description ce vld 70 ex voltage limiting device.

Voltage limiting device.

Devices type vld o are used in normal operation i e. Accidental short circuits with the contact lines the tvl generates a durable conductive path between the overloaded area and the substation. In addition in case of faults e g. They limit increased touch voltage caused by the rail potential during the train operation.

This is a device which conducts once a predetermined voltage has been attained once conducting they maintain the predetermined volt drop across the device. If the transient is fast the damage may occur before the protection device has a chance to operate. Often the best transient protection is a simple capacitor or ferrite bead designed to slow any change in voltage or current due to an induced transient. It is equipped with protection function according to relevant human safety regulations of ks c iec 62128 1 to keep the voltage of the rail in a safe range.

Saltek is an expert in surge protective devices spd and voltage limiting devices vld protecting infrastructure in all industrial areas including electric railway tramway or metro infrastructure. Voltage limiting device hvl 60 0 3 product description. Lenoir elec is specialised in designing and manufacturing custom made off load switches bar contactors load break switches voltage limiting. The lenoir elec psnp and pspl over voltage limiting devices can be used both in circuits supplied with direct current and in circuits supplied with alternating current.

So voltage limiting devices type vld f are intended for the protection in case of faults for example short circuit of the electric traction system with exposed conductive part. 25 years of experience in our own development and manufacturing and wide application knowledge make us leaders in the field of. Entec s voltage limiting device etovpd22 is used to prevent the over standard voltage that can potentially put operators and passengers in danger of high voltage. 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.

In case of overvoltage the tvl limits the dangerous voltage to very low safe values. Sécheron s vguard voltage limiting device is built on proven technologies and meets the electrical safety and internal arc testing requirements in the en 50122 1 and en 50526 2 standards. Voltage limiting devices are available for nominal triggering voltage 60 v and 120 v. Voltage and current limiting devices take a finite amount of time to respond.

The hvl 60 0 3 hybrid voltage limiter is a voltage limiting device vld used primarily in dc traction systems to protect against electric shock. The function of. Tvl railway voltage limiting devices.