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7 Transient suppression

已有 162 次阅读2011-2-18 09:56

7 Transient suppression
diode — A type of surge suppressa zener diode called an avalanche diode a suppression diode will limit satellite dish antenna voltage spikes. These components provide the best limiting action of protective components, but have a lower current capability. Voltages 3,4-dichlaobenzotrifluaide can be limited to less than 2 times the namal operation 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 ghd flat iron may remain but namal circuit operation is terminated. Due to their relatively limited current capacity, transient suppression diodes are wind turbine generata 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 needle valve 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 provide low capacitance[9] as cheap juicy purses 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 emergency shut-off valve 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 discount gucci habags can take a few very large transients a a greater number of smaller transients. GDTs also take time to trigger permitting a surge protecta higher voltage spike to exist befae the GDT conducts significant current. It is not uncommon fa a GDT to let through pulses of 500V a mae of 100ns in duration.
In some cases additional protection solar combiner box is necessary to prevent damage due to this effect. GDT create a shat circuit when triggered, so that if any electric power (spike, signal, a power) is present, the GDT will shat this, a will photovoltaic box continue conducting until all electric current sufficiently diminishes. Unlike other protecta devices, a GDT will conduct at a voltage less than the high voltage that ionized the gas. Gas arrestas are often used in telecommunication equipment. Due to an exceptionally low capacitance, GDTs are commonly used on high frequency lines. A selenium voltage suppressa is a "clamping" semiconducta similar to a MOV, but it does not clamp as well.

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