IEEE 4-2013 pdf download IEEE Standard for High-Voltage Testing Techniques
assured disruptive discharge voltage: The prospective value of the test voltage that causes disruptivedischarge under specified conditions.
conventional deviation of the disruptive discharge voltage (z): The difference between the 50% and 16%disruptive discharge voltages.
NOTE– lt is often expressed in per unit or percentage value referred to the 50% disruptive discharge voltage
dielectric loss factor: The factor by which the product of a sinusoidal alternating voltage applied to adielectric and the component of the resulting current having the sare period as the voltage have to bemultiplied in order to obtain the power dissipated in the dielectric.
discharge: The passage of electricity through gaseous, liquid, or solid insulation
disruptive discharge: A discharge that completely bridges the insulation under test, reducing the voltagcbetween the electrodes practically to zero. Syn: electrical breakdown.
disruptive discharge probability (p): The probability that one application of a prospective voltage of agiven shape and type will cause a disruptive discharge.
disruptive discharge voltage: The voltage causing the disruptive discharge for tests with direct voltagealternating voltage, and impulse voltage chopped at or after the peak; the voltage at the instant when thedisruptive discharge occurs for impulses chopped on the front.
error: The difference between the measured value of a quantity and the true value of that quantity underspecified conditions.
external insulation: The air insulation and the exposed surface of the solid insulation of a piece ofequipment, which are subject to both electrical stress and the effects of atmospheric and other conditionssuch as contamination, humidity, vermin, etc.
fifty percent disruptive discharge voltage (Vn): The prospective value of the test voltage that has a50% probability of producing a disruptive discharge.
flashover: A disruptive discharge over the surface of a solid insulation in a gas or liquid
impulse: An intentionally applied transient voltage or current that rises rapidly to a peak value and thenfalls more slowly to zero.
internal insulation: Insulation comprising solid, liquid, or gaseous elements, which are protected from theeffects of atospheric and other external conditions such as contamination, humidity, vermin, etc.
nondisruptive discharge: A discharge between intermediate electrodes or conductors in which the voltageacross the terminal electrodesis not reduced to practically zero
nonself-restoring insulation: Insulation that loses its insulating properties or does not recover themcompletely after a disruptive discharge
nonsustained disruptive discharge: A momentary disruptive discharge
partial discharge: A discharge that does not completely bridge the insulation between electrodes.
p-percent disruptive discharge voltage : The prospective value of the test voltage that has a p-percent probability of producing a disruptive discharge.