Voltage Limiting Device Panel

17 Aug

Voltage Limiting Device Panel

The VLD system prevents any voltage potential increase from occurring between the return circuit and earth caused by faults or short-circuits.

VLD respects the limits of maximum permissible touch voltage as defined by EN 50122-1 and EN 50122-3 standards. The fast actuation is guaranteed by thyristors combined with a NC contactor that provide the long-term closing.

The integrated systems are reliable solutions based on our yearlong technical experience.

  • DC rated voltage: 750V, 1500V and 3000V
  • Maximum current: 20kA, 50kA and 100kA
  • Fast actuation by thyristor module
  • Slow activation by NC contactor
  • Self-diagnostic
  • Local / Remote control
  • Reliability and long lifetime
  • Compactness
  • Compliant with EN 50526-2 standard
Voltage Limiting Device Panel
Class according to EN 50526-2 4.1 / 4.2
Nominal Voltage [Vdc] 750 / 1500 / 3000
Making capacity [kAdc] 25 / 50 / 100
Actuation time < 5ms (by thyristors)
Execution Fixed / withdrawable
Control type Automatic / Local / Remote
Protection overvoltage DC (45) / overvoltage AC (59) / Maximum current DC (76)
Thyristors T
Thyristor electronic control M
NC contactor M
Resistors M
Measurements M
Protection relay M
M: Made by Microelettrica T: Third parties