(c) Figure Q5(c) shows a without and with guard circuit of a Megger insulation resistance instrument. The instrument supplies a test voltage of 15 kV. The measurement without a guard terminal provides a current of 6.1 µA, while the current decrease to 1.1 µA when using a guard terminal. Determine the following: (i) The volume resistance of the cable insulation, ry. (ii) The surface leakage resistance, rs.
(c) Figure Q5(c) shows a without and with guard circuit of a Megger insulation resistance instrument. The instrument supplies a test voltage of 15 kV. The measurement without a guard terminal provides a current of 6.1 µA, while the current decrease to 1.1 µA when using a guard terminal. Determine the following: (i) The volume resistance of the cable insulation, ry. (ii) The surface leakage resistance, rs.
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter7: Symmetrical Faults
Section: Chapter Questions
Problem 7.21MCQ
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