IEEE C62.33-1982 pdf free

04-27-2021 comment

IEEE C62.33-1982 pdf free.IEEE Standard Test Specifications for Varistor Surge-Protective Devices.
IEEE C62.33 applies to varistors for surge protective applications on systems with dc to 420 Hz frequency andvoltages equal to or less than 1000 V rms, or 1200 V dc.This standard contains definitions, service conditions and aseries of test criteria for determining the electrical characteristics of these varistors. If the characteristics differ with thedirection of conduction, then the tests determine characteristics for both polarities. Arresters covered by ANSIIEEEC62.1-1984 [1] are excluded from this standard.
The tests in this standard are intended as design tests as defined in ANSIIEEE Std 100-1984 [3] and provide a meansof comparison among various surge-protective devices.
Varistor surge-protective devices are used to provide transient overvoltage protection in electrical circuits. Varistors, asdefined in ANSIIEEE Std 100-1984 [3], are devices exhibiting a nonlinear volt-ampere characteristic.Morespecifically, this standard applies to such devices having a monotonic increase in voltage with increasing current flow.Because the impedance of the device decreases with increasing voltage it provides a relatively low impedance path forsurge voltages and a relatively high impedance at normal system voltage, before and after the occurrence of the surge.
Test criteria and definitions in this standard provide a common engineering language beneficial to user andmanufacturer of surge-protective varistor devices.Due to the voltage and energy levels employed in the majority of tests described herein, all tests should be consideredhazardous and appropriate caution should be taken in their performance.
For the purpose of this standard, the values of rated parameters are established by the manufacturer, according tostatistical acceptance criteria as indicated in 4.2.The descriptions of this section apply to varistors having symmetrical volt-ampere characteristics or asymmetricalvolt-ampere characteristics. If the volt-ampere characteristics are different with the direction of conduction they areasymmetrical and the characteristic values shall be specified for each direction. Figure 1 illustrates the relationshipbetween terms on a graph. Some terms are based on impulse response behavior. For the method of defining impulsewaveforms see ANSI/IEEE Std 4-1978 [2] and Fig 2 of this standard.IEEE C62.33 pdf download.

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