Electric Power Generation, Transmission, and Distribution

15.1.2 Positive Corona Modes When the highly stressed electrode is of positive polarity, the electron avalanche is initiated at ...

The presence of ion space charges of both polarities in the anode region greatly affects the local distribution of the field, an ...

each corresponding to the ionization spreading over a small area at the anode and then being suppressed by the positive ion spac ...

the expense of the onset streamer, until the latter is completely suppressed. A new mode, the positive glow discharge, is then e ...

15.2 Main Effects of Corona Discharges on Overhead Lines (Trinh, 1995b) Impact of corona discharges on the design of high-voltag ...

15.2.1 Corona Losses The movement of ions of both polarities generated by corona discharges, and subjected to the applied field ...

Upon injection, the discharge current pulse splits itself into two identical current pulses of half amplitude propagating in opp ...

½Š¼M 1 = ffiffiffi 6 p 1 = 21 = ffiffiffi 3 p  2 = ffiffiffi 6 p 01 = ffiffiffi 3 p 1 = ffiffiffi 6 p  1 = 21 = ffiffiffi 3 p ...

Similar to the case of electromagnetic interference, the ability of the line conductors to produce audible noise is characterize ...

The sound pressure, usually expressed in terms of decibel (dBA) above a reference level of 2 10 ^5 N=m^2 is prðÞ¼ ffiffiffiffi ...

These modal currents, once transformed back to the current mode,Eq. (15.13), give the modal components of the noise currents flo ...

of the right-of-way, typically 15 m from the outside phases of the line, are generally used to quantify the interference and noi ...

whereEcis the corona onset field,ais the radius of the conductor, andmis an experimental factor to take account of the surface c ...

E 0 ¼ 1 ln 2 h a  U a Ec (15:22) It can be seen that the field intensity at the conductor surface is inversely proportional t ...

foul weather, their effects are controlled to acceptable levels at the edge of the rights-of-way of the line. For AC lines, the ...

15.4 Conclusions This chapter on transmission systems has reviewed the physics of corona discharges and discussed their impact o ...

Trinh, N.G. and Jordan, I.B., Modes of corona discharges in air,IEEE Trans., PAS-87, 1207, 1968. Trinh, N.G. and Jordan, I.B., T ...

16 Geomagnetic Disturbances and Impacts upon Power System Operation John G. Kappenman Metatech Corporation 16.1 Introduction.... ...

Large impulsive geomagnetic field disturbances pose the greatest concern for power grids in close proximity to these disturbance ...

16.2 Power Grid Damage and Restoration Concerns The onset of important power system problems can be assessed in part by experien ...