The Applications of varistor metal oxide

To protect telecommunication lines, transient suppression devices such as 3 mil carbon blocks (IEEE C62.32), ultra-low capacitance varistor metal oxide , and avalanche diodes are used. For higher frequencies, such as radio communication equipment, a gas discharge tube (GDT) may be utilized.[citation needed] A typical surge protector power strip is built using xatge MOV . Low-cost versions may use only one varistor, from the hot (live, active) to the neutral conductor. A better protector contains at least three varistors; one across each of the three pairs of conductors. In the United States, a power strip protector should have an Underwriters Laboratories (UL) 1449 3rd edition approval so that catastrophic MOV failure does not create a fire hazard.

GIS Arresters

If the low-pressure side of the distribution transformer is not installed MOA, when the high-pressure side discharge lightning current polymer arrester to the earth when the grounding device to produce a pressure drop, the pressure drop through the distribution transformer housing while in the neutral point of the low pressure side of the winding. Therefore, low-voltage winding of the lightning arrester current will flow through the high-voltage winding turns ratio induced by a high potential (up to 1000 kV), the potential will thunder and high-voltage side winding voltage is superimposed, causing the high-voltage winding neutral point potential increased insulation breakdown near the neutral point. If the low-pressure side mounted MOA, MOA discharge when the potential of the high-pressure side grounding means is increased to a certain value, the low-pressure side xatge MOV begins to discharge, the low pressure side coil outlet and where the potential difference between the end point and the housing is reduced, so that to eliminate or reduce the impact of "anti-conversion" potential.