Method for measuring a resistance value in an electrical apparat

Details Method for measuring a resistance value in an electrical apparat Method for measuring a resistance value in an electrical apparat

1995-01-27

1996-08-13

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324547, 324726, 340646, G01R 2708

Patent

active

055460100

ABSTRACT:
The invention relates to a method for measuring a resistance value in a network incorporated in an electrical apparatus, wherein the network has at least two accessible terminals, the network has at least two time constants differing mutually by at least one order of magnitude, and the resistance value can be related to the voltage applied to the terminal clips and the current flowing through the apparatus.
Such control switches are poorly accessible.
Direct measurement is time-consuming as a result of the large value of the time constants. These problems are diminished by applying a step-like change of the voltage to the terminal clips, measuring the current flowing through the terminal clips before the change has taken place and after the transient phenomenon related to the smallest time constant and caused by applying the change is damped, and calculating the first resistance value from the measured values of the current.

REFERENCES:
patent: 4458196 (1984-07-01), Goyal et al.
W. Widmann, "Switching Capacities of Diverter Switches for Transformers", Siemens Power Engineering & Automation, VII (1985) No. 1, pp. 35-39, month unavailable.

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