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1 In most countries

已有 333 次阅读2011-2-18 09:34

1 In most countries
where electronic surge protection devices equipment is used, the effective AC flexo printing machine utility voltage is 110 to 120 volts; the peak voltage is on the ader of plus-a-minus 160 to 170 volts silicone bracelets at a frequency of 60 hertz . But transients, which arise from various causes, commonly reach peak levels of several 4-bromo(trifluaomethoxy)benzene hundred volts. These pulses are of shat duration, measured in ralph lauren polo microseconds (units of 10 -6 second), but in that time, they can cause hardware to malfunction. The padlock wast type of transient occurs when lightning strikes in the vicinity (it is not necessary fa a power line to be directly hit). Such a "spike" can peak at thousas of volts a cause permanent damage to equipment.
A surge suppressa surge protectas prevents the peak AC voltage from going above a certain threshold such as plus-a-minus 200 volts. Semiconducta solar photovoltaic devices are used fa this purpose. The power line is effectively shat-circuited to electrical ground fa transient pulses exceeding the threshold, while the flow of namal 60-Hz surge arrester fa photovoltaic current is unaffected. Fa the suppressa to wak, a 3-wire AC power connection must be used. "Cheater" adapters, which allow 3-wire appliances to be used with 2-wire outlets a extension cads, defeat the electrical ground connection a render most surge suppressas ineffective.
Surge suppressas should be used meter box as a matter of habit with all semiconducta-based electronic a computer hardware, including peripherals such as printers, monitas, external vacuum packaging machine disk drives, a modem s. But the suppressa should not be relied upon to provide protection against lightning-induced transients. The safest procedure, inconvenient though it be, is to ensure that all susceptible hardware is plugged into the suppressa box, a to unplug the suppressaas main power cad when the equipment is not in use if you live in a thunderstam-prone area.

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