IEEE 1434-2000 pdf download IEEE Trial-Use Guide to the Measurement of Partial Discharges in Rotating Machinery
3.28 pulse discharge: A type of partial discharge (PD) phenomenon characterized by a spark-type breakdown. The resultant detected pulse discharge has a short rise time, and its frequency spectrum may extend asfar as zl00 MHz. Such a pulse discharge may be readily detected at the terminals of the winding or component under by means of conventional pulse detectors, that are generally designed for PD measuremmentswithin the frequency band from 10 kHz to several megahertz.
3.29 pulse height analysis: The measurement of the number of pulses occurring within a series of magnitude windows over a defined phase period, not exceeding one half-cycle, of the alternating voltage applied tothe object under test. Sampling periods of one or more seconds may be involved.
3.30 pulse phase analysis: A type of pulse height analysis in which there is more than one phase windowfor each half-cycle of the alternating voltage applied to the object under test.
3.31 pulseless-glow discharge: A type of partial discharge (PD) phenomenon characterized by a diffusedglow. The overall voltage waveform across a gap space undergoing pulseless-glow discharge does not indicate the presence of any abrupt collapse in voltage, except for the two at the beginning of each half-cycleAlthough discharge energy is expended over the pulseless region, a conventional PD detector will give noindication of this, as it will only respond to the two initiating breakdowns in each half-cycle.
3.32 quadratic rate (D): The sum of the squares of the individual discharge magnitudes during a certairtime interval divided by that time interyal
D =(1/T)[21+ 2+…2.2]
The quadratic rate is expressed as (coulombs)- per second. This quantity assigns greater weight to the largerpulses.
3.33 quasi-peak: A quantity, measured with an RC weighting circuit having specifed time constant(s)which is a fraction of the peak value of pulses of constant amplitude, the fraction increasing toward unity asthe pulse repetition rate is increased.
3.34 radio influence voltage (RIV): The radio noise voltage appearing on conductors of electric equipmentor circuits, as measured using a radio noise meter as a two-terminal voltmeter in accordance with specifiedmethods.
NOTE-See NEMA Std 107-1987
3.35 random partial discharges (PDs): Discharges that recur infrequently with a repetition rate of less thanone per second.
3.36 resistance temperature detector (RTD): A temperature detector that is usually a three-terminal resistor, either 10 92 copper at 25 C or 100 2 platinum at °C, whose sensing element is about 50 cm in lengthwhich is encapsulated within an insulating substrate of suitable thermal rating. RTDs are usualy installedbetween top and bottom bars (coil legs) in a given slot. The measuring leads should be positioned such thatthey do not interfere with the stress control coating.
3.37 signal attenuation: A decrease in signal magnitude from one point to another
3.38 signal reflection: The result of a mismatch in the characteristic (surge) impedances of the signal transmission path in which a portion of the incident signal is reflected in the direction opposite to the incidentsignal.