Mitigation of ground loop effects in high-voltage measurements

Ground loops can affect voltage measurement systems, in particular those in high-power test circuits. The net or common-mode current through the signal cable shield induces interference in the signal circuit. A generalized transfer impedance Z/sub t/ describes this undesired coupling. In a low-frequ...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2002-06, Vol.51 (3), p.480-486
Main Authors: van Deursen, A.R.J., van Waes, J.B.M.
Format: Article
Language:English
Subjects:
Cable shielding
Cables
Circuit testing
Circuits
Coaxial cables
Coupling circuits
Dividers
Frequency
Grounds
Interference
Joining
Mathematical models
Power cables
Shields
Switches
System testing
Voltage
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Summary:Ground loops can affect voltage measurement systems, in particular those in high-power test circuits. The net or common-mode current through the signal cable shield induces interference in the signal circuit. A generalized transfer impedance Z/sub t/ describes this undesired coupling. In a low-frequency circuit model, Z/sub t/ decomposes into two terms which vary with the cable length l and with l/sup 2/ respectively. Several divider setups are discussed; all employ the same high-voltage arm. The position and composition of the low-voltage arm vary. A proper design of the signal circuit ensures a low Z/sub t/ at the power frequency. Measurements confirm the model. With the low Z/sub t/, the direct capacitive coupling between the high-voltage arm and neighboring circuits showed up as a comparable interference source.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2002.1017718