Surge Arrester for High Voltage Systems

ZOTUPHV

ZU HV DC is a surge arrester with typical usage in direct current systems and particularly where electric traction (railway, underground) is used.

It provides the following features and benefits:

• Surge arrester type L with: limiting operation, varistor for protection against overvoltages in direct current applications, and atmospheric lightning strikes;
• This SPD is Installed in a vertical position, when hooked on overhead lines and when mounted on electric motors;
• Its high mechanical resistance to bumps and vibrations complies with the regulations of IEC/EN 60068 part 2-29;
• Its silicone rubber housing with high creepage distance allows internal or external mounting;
• Its high discharge capacity In is 10 kA (8/20);
• Its continuous voltage rating is from 1 to 4kV d.c.;
• Size and volume of the surge arresters based on the practical minimum for each nominal voltage;
• The insulator of the surge arrester is characterized by the absence of junction lines;
• The construction and manufacturing process prevent partial discharges;
• Sealed with aluminium fittings and terminead with stainless steel clamps, screws and washers.

Data sheet ZU HV DC

Surge Arrester for High Voltage Systems

ZOTUPHV

Disconnector device model ZU 4

Surge arresters for medium voltage systems are often equipped with a disconnector that permits the disconnection of the surge arrester in case of an internal fault. This disconnection prevents a persistent fault in the network and provides a visual indication that the surge arrester is defect. The disconnector is activated by an increase in internal pressure due to the electrical arc caused by the sublimation of the internal connecting wire as a result of the fault current. The operating mechanism is very reliable and the characteristc remains constant even over long time.

NOTE: It is important to ensure that sufficient insulating distance is kept for parts remaining energised after the detachment of the lower part of the disconnector.

Data sheet ZU 4