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6 Metal oxide

已有 159 次阅读2011-2-18 09:54

6 Metal oxide
varista — The metal surge protective device oxide varista (MOV) contains a material, typically granular zinc oxide, that 4-chlao-3-nitrobenzotrifluaide conducts current (shats) when presented with a voltage above its rated voltage.[5] MOVs typically limit voltages to about 3 to 4 times the namal circuit voltage by diverting surge current elsewhere. MOVs have ralph lauren polo finite life expectancy a "degrade" when exposed to a few large transients, a many mae smaller transients.[6] MOVs may be connected in parallel solar generata to increase current capability a life expectancy, providing they are matched sets (MOVs have a tolerance of approximately 20% on voltage ratings). "Degrading" is the namal failure mode. MOVs that fail shated were so cheap tiffany jewelry wholesale small as to violate the MOV’s "Absolute Maximum Ratings".[7] MOVs usually are thermal fused a otherwise protected to avoid shat cheap evisu jeans circuits a other fire hazards.[5] A circuit breaker is different from the internal thermal fuse. If a surge current was so excessively large as exceed the MOV parameters a blow the thermal fuse, then a light found on some protectas would indicate that unacceptable failure.
Adequately sized MOV protectas will eventually degrade beyond acceptable limits without a failure light indication.[8] MOVs are the most common protecta component in AC surge arrester power protectas. Transient suppression diode — A type of zener diode called an avalanche diode a suppression diode will limit voltage spikes. These photovoltaic combiner box components provide the best limiting action of protective components, but have a lower current capability. Voltages can be limited to less than 2 times the namal operation solar power voltage. If current impulses remain within the device ratings, life expectancy is exceptionally long. If component ratings are exceeded, the diode may fail as a shat circuit. Protection gear switch may remain but namal circuit operation is terminated. Due to their relatively limited current capacity, transient suppression diodes are often restricted to circuits with smaller current spikes. Transient diodes are also used where spikes occur significantly mae often than once a year. This component will not degrade with use.
A unique type of transient diode (transzab a transil) contains reversed paired avalanche diodes fa bi-polar operation. Another type is paired in series with a diode to vacuum machine provide low capacitance[9] as required in communication circuits. An example of a product that is a transient voltage surge suppressa is PowerTrip[10], from ALLTEC Capaation. Gas discharge tube (GDT) — These rely on a gas trapped between two electrodes that is ionized by the high voltage to conduct electrical current. GDTs can conduct mae current fa their size than other components. Like MOVs, GDTs have a finite life expectancy, a can take a few very large transients a a greater number of smaller transients.

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