It may use an electromechanical mechanism or electronic components.
Ac voltage limiter.
During the negative alternation the zener acts as a forward biased diode and limits the negative voltage to 0 7 v.
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Part a shows a zener used to limit the positive peak of a signal voltage to the selected zener voltage.
Voltage limiting device for dc traction systems transient surges caused by lightning and switching operations in the system are limited by the mo arrester.
Depending on the design it may be used to regulate one or more ac or dc voltages.
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If surges occur for a longer period of time milliseconds to hours due to faults in the system or for operational reasons the thyristors fire to limit touch voltages.
Analysis of ac voltage measurements.
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Below figures shows three basic ways the limiting action of a zener diode can be used.
In general all ac voltage sources vary from fluctuation in ac voltage over power distribution systems.
When different from an expected measurement voltage is more likely to be lower than normal.
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Zener diodes can be used in ac applications to limit voltage swings to desired levels.
Generally speaking voltage measured in ac power systems should be within 10 and 5.
A voltage regulator is a system designed to automatically maintain a constant voltage level.