Cable System Transients: Theory, Modeling and Simulation by Akihiro Ametani

By Akihiro Ametani

A scientific and accomplished creation to electromagnetic brief in cable structures, written by way of the across the world popular pioneer during this field

• provides a scientific and entire creation to electromagnetic temporary in cable systems
• Written through the across the world well known pioneer within the field
• Thorough insurance of the cutting-edge at the subject, offered in a well-organized, logical sort, from basics and functional applications
• A spouse site is obtainable

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It is assumed that there exists no leakage flux in the FEM, and the pipe is infinitely thick in the approximate method. 1 Measured and calculated impedances of cable A Frequency f (Hz) Meas. 50 Calc. value Z (mΩ) ???? (deg) Error ΔZ (%) Error Δ???? (%) Calc. 5 275 kV∕2500 mm2 CSZV cable: (a) cross section; and (b) equivalent cylindrical conductors The results obtained by the approximate method agree well with the FEM. The calculation error of the approximate method is caused by the distance between the two conductors.

This creates open ends in the sheath circuit. The magnitude of the continuous sheath voltage, which is induced by positive-sequence power flow in a core conductor in normal operating conditions, is equivalent to that in the case of cross bonding. The short-term sheath voltage at the sheath open end becomes an issue in the case of single-point bonding. 15: • • • • Single-line-to-ground (SLG) faults (external to the targeted major section) Three-phase faults (external to the targeted major section) Switching surges Lightning surges (only for mixed UGC/OHL) The power-frequency component of the short-term sheath voltage under SLG faults and three-phase faults is calculated using the formulas given in References [19–22].

2. The conductor’s internal impedance explained above contributes only to the conductor impedance, but not to the conductor shield impedance and the mutual impedance between the conductor and the conductor shield. Since the earth-return impedance of a cable is far greater than the conductor impedance, the effect of the conductor impedance cannot be observed in the total impedances of a cable, that is, the conductor-self, the conductor shield-self, and the conductor-to-shield mutual impedances. 3.

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