DAQO GROUP



NPMPD
Over Voltage Protection Device

In DC traction system impermissible touchvoltage may occur between the return circuit and the struct...

Over Voltage Protection Device

In DC traction system impermissible touchvoltage may occur between the return circuit and the structure earth due tooperational and short-circuit currents. In this case, a short-circuit devicemust be used as a voltage protection device between the return circuit and thestructure earth, preventing the existence of impermissible touch voltage.

Features

1. Adopt high-performance DC contactor (ora hybrid switch consisting of thyristor and DC contactor parallel connected).It can meet the European standard and safety requirement.

2. Low maintenance due to application ofthyristors.

3. Maximum personnel and equipmentprotection due to fast reaction time.

4. Simple installation, compact design. 


5. No commissioning needed before using.

 

Rated operatioral current 800A/1250A 
Mechanical endurance (time of operation cycle) 1.5x10
OPeration frequeney (time of operation cycle per hour) 120
Short circuit breaking capacity 65kA/150ms 50kA/200ms 
Voltage monoitoring and reaction time 
U>     Adjustable scope 25~250V DC Time 0.15s-99h 
U>>   Adjustable scope 25~250V DC Time 0.1s 
U>>> Adjustable scope 600V DC±50V DC Time <0.0002s 
Control voltage 220V AC/DC 
Cubicle Steel plate 
Overall dimension (WxDxH) 600(800)x600x2200mm 
Color RAL 7032/RAL7035 
Protection degree IP40/IP54 
Weight 250kg~300kg 

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