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|Genre:||Metal Oxide Varistor||Use:||Surge Arrester|
Lightning Arrester Metal Oxide Varistor of High Voltage
The Metal Oxide Film Resistor contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides (such as small amounts of bismuth, cobalt, manganese) sandwiched between two metal plates (the electrodes). The boundary between each grain and its neighbour forms a diode junction, which allows current to flow in only one direction.
The mass of randomly oriented grains is electrically equivalent to a network of back-to-back diode pairs, each pair in parallel with many other pairs. When a small or moderate voltage is applied across the electrodes, only a tiny current flows, caused by reverse leakage through the diode junctions. When a large voltage is applied, the diode junction breaks down due to a combination of thermionic emission and electron tunneling, and a large current flows. The result of this behaviour is a highly nonlinear current-voltage characteristic, in which the MOV has a high resistance at low voltages and a low resistance at high voltages.
D28 Metal Oxide Varistor(MOV):
|Type||D28 Metal Oxide Varistor(MOV)|
|Voltage Gradient V/mm||210~235|
|Square Wave Test Valve||200|
|4/20μ S High Current Withstand kA||65|
|8/20μ S high current withstand kA||10|
|DC1mA Refering Voltage kV||5.3|
|0.75Times U1mA Leak current μ A <||10|
|Residual Votage Ratio||1.88|
|Aging Load Point Ratio%||85|
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