Terminal leakage monitoring for field devices

Details Terminal leakage monitoring for field devices Terminal leakage monitoring for field devices

2006-12-28

2009-02-24

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C702S065000, C073S040000

Reexamination Certificate

active

07495451

ABSTRACT:
A field device detects the presence of terminal leakage between a first terminal and a second terminal in the terminal block area of the field device using a voltage variation ratio that is based on variations in a terminal voltage located across output terminals of a field device and variations in a current regulation voltage located within a current regulation circuit. Preferable, the field device measures an initial voltage variation ratio κ0and a subsequent voltage variation ratio κt. Based on the initial voltage variation ratio κ0and the subsequent voltage variation ratio κt, the terminal leakage existing between the first terminal and the second terminal can be calculated.

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patent: 2005/0289276 (2005-12-01), Karschnia et al.
patent: 2006/0170579 (2006-08-01), Ohnhaeuser et al.

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