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(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)
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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(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. (d) Discuss the important of guard-wire method in a high resistance measurement.
Transcribed Image Text:(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. (d) Discuss the important of guard-wire method in a high resistance measurement.
IR+IL Guard Terminal HA 'R JA IR µA IR V V V V 'R Insulation without guard circuit with guard circuit (i) (ii) Figure Q5(c)
Transcribed Image Text:IR+IL Guard Terminal HA 'R JA IR µA IR V V V V 'R Insulation without guard circuit with guard circuit (i) (ii) Figure Q5(c)
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