Title page for ETD etd-100399-152011

Type of Document Master's Thesis
Author Summers, Clinton Thomas
Author's Email Address clinton_summers@mk.com
URN etd-100399-152011
Title Distance Protection Aspects of Transmission Lines Equipped with Series Compensation Capacitors
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Phadke, Arun G. Committee Chair
Liu, Yilu Committee Member
Mili, Lamine M. Committee Member
  • compensation
  • power
  • series capacitor
  • spark gap
  • metal oxide varistor
  • MOV
  • computer relaying
  • relaying
  • distance protection
  • series capacitor compensated line
  • transmission line
Date of Defense 1999-09-29
Availability unrestricted
In order to meet the high demand for power transmission capacity, some power companies have installed series capacitors on power transmission lines. This allows the impedance of the line to be lowered, thus yielding increased transmission capability. The series capacitor makes sense because it's simple and could be installed for 15 to 30% of the cost of installing a new line, and it can provide the benefits of increased system stability, reduced system losses, and better voltage regulation.1

Protective distance relays, which make use of impedance measurements in order to determine the presence and location of faults, are "fooled" by installed series capacitance on the line when the presence or absence of the capacitor in the fault circuit is not known a priori. This is because the capacitance cancels or compensates some of the inductance of the line and therefore the relay may perceive a fault to be in its first zone when the fault is actually in the second or third zone of protection. Similarly, first zone faults can be perceived to be reverse faults! Clearly this can cause some costly operating errors.

The general approach of interest is a method leading to the determination of the values of series L and C of the line at the time of the fault. This is done by analyzing the synchronous and subsynchronous content of the V and I signals seperately which provides adequate information to compute the series L and C of the line.

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