Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

basic impulse insulation level (BIL)
a measurement of the impulse withstand capability of a piece of electric power equipment based on its ability to withstand 50% of impulses applied at the BIL voltage.
basic lightning impulse level (BIL)
the strength of insulation in terms of the withstand voltage crest value using a standard voltage level impulse.
electromagnetic pulse (EMP)
a large impulsive-type electromagnetic wave generated by nuclear or chemical explosions.
impulse
a unit pulse.
See impulsive transient
impulse breakdown
a test of electrical insulation in which lightning or switching impulses are applied.
impulse generator
(1) an electronic device delivering single pulses of various shapes, preferably square.

(2) a high-voltage trigger generator.
pulse
a sudden change of an electrical value of short duration with a quick return to the original value. A pulse injects a short sharp burst of energy into a system and is usually quantified by its area rather than its amplitude or its duration. In the limit as the amplitude tends to infinity and the duration to zero, it approaches the Dirac delta function whose Laplace transform is unity.
sine-squared pulse
pulse string made from a standard sinewave with an added DC component equal to one-half of the peak-topeak value of the sine wave. The pulse string is, therefore, always positive in value.
twelve-pulse converter
the combination of two 6-pulse converters connected through a Y-Y and a delta-Y transformer in order to cancel the characteristic 5th and 7th harmonics of the 6-pulse converters. The lowest characteristic harmonics with twelve-pulse converters under balanced conditions are the 11th and 13th harmonics. The converters are connected in parallel on the AC side and in either series or parallel on the DC side, depending on the required DC output voltage.
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