Medium Voltage Zinc Oxide Surge Arrester for Transformer

ZnO varistor blocks is the core component to medium voltage surge arresters for transformer. It allows the medium voltage surge arresters have extremely strong nonlinear volt ampere characteristics, which means the resistance is extremely high and conducts almost no current at power frequency voltage, however, it decreases sharply under overvoltage conditions, allowing current to flow and discharge the energy.

The insulation housing has a umbrella skirt structure to increase the creepage distance as the most as the possible. In most cases, the insulation housing adopts porcelain or silicone rubber. The porcelain housing is stronger in mechanical strength which is wildly used in 110 kv power grid, and the polymer housing is only 1/5 to 1/3 the weight of a porcelain bushing which is widely used in 10 to 66 kv power grid.

Product Parameter:

Product FAQ:

Q: How does a medium voltage zinc oxide surge arrester for transformer work?

A: Under normal power frequency voltage, the ZnO arrester exhibits extremely high resistance and conducts almost no current.

When an overvoltage occurs, the resistance drops sharply, allowing the arrester to conduct and safely dissipate the surge energy.

Q: Can medium voltage zinc oxide surge arrester for transformer be customized?

A: Yes, they can be tailored according to:

1. Transformer voltage class;

2. System configuration and installation type;

3. Surge current rating;

4. Environmental conditions (pollution, temperature, humidity).