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Lightning Arrester Metal Oxide Varistor of High Voltage
Product Description:
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.[3] 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.
Specifications:
D28 Metal Oxide Varistor(MOV):
| Type | D28 Metal Oxide Varistor(MOV) |
| Specification mm | D28*24 |
| 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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