What a Surge Arrester Should doClamp transients ANSI/IEEE STANDARDS
Voltage Wave Form 1.2 x 50Leading edge builds from 10% to 90% of peak in 1.2 microseconds (µs). Leading edge from 0% through peak and decrease to 50% in 50 microseconds. This is considered by many experts to be about the worst case transient a secondary surge arrester would typically experience. Current Wave Form 8x 20Leading edge builds from 10% to 90% of peak in 2.0 µs. Leading edge from 0% through peak and decrease to50% in 20 µs. JouleUnit of energy equal to one watt-second. Leakage CurrentThe AC or DC current flowing from input to output and/or chassis of an isolated device at a specified voltage. Lightning Arrester
See Secondary Surge Arrester MCOV (Maximum Continuous Operating Voltage)The maximum designated RMS value of power frequency voltage that may be applied continuously between the terminals of the arrester. MOV (Metal Oxide Varistor)
Metal Oxide Varistor. A solid state component designed to handle large amounts of current which reacts in the low nanosecond time range. Shunts or directs large amounts of current to ground when voltage exceeds a threshold level above the MCOV. Peak ValueMaximum (crest) value of a wave form, surge or impulse, reached during a specific particular cycle or operating time. RMS VoltageApplies to an AC sine wave, the RMS (Root Mean Square) is also known as effective voltage. i.e. 120 VAC 60Hz sinewave would have a peak voltage of 169.7 or 1.414 times the RMS voltage. Conversely the RMS voltage is 0.7071 times the Peak Voltage. Surge ArresterA protective device for limiting surge voltages on equipment by diverting surge current and returning the device to its original status. It is capable of repeating these functions as specified and is also called a lightning arrester. Classification of Arresters (IEEE)- Station - (Utility / Power Company)
- Intermediate - (Utility / Power Company>
- Distribution - (Utility / Power Company>
Heavy Duty Normal Duty - Secondary - 1, 2, 3a, 3b are designed for use by the Power Utility companies. Guardian Angel manufactures Secondary Surge Arresters for use on residential, industrial and farm electrical equipment.
IEEE C62.41Category ADescription: Long branch circuits more than 10 meters (33 feet) from a Category B location. Category BDescription: Main Feeder Circuits, short branch circuits, distribution panels, heavy appliance circuits plus receptacles than 10 meters (33 feet from a category C circuit. Category CDescription: Outside and service entrance main service panels and any overhead lines to separate structures (weatherhead).
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