METHOD OF CURRENT MEASUREMENT Russian patent published in 2009 - IPC G01R19/30 

FIELD: electricity.

SUBSTANCE: invention refers to power industry, namely to instrumentation. Method of current measurement using reed relay arranged nearby conductor consists in the following: time t₁ between moments of closing and opening of reed relay contacts is measured and amplitude I_m is calculated. At that n-1 of reed relays is arranged additionally nearby conductor in such a way that i reed relay closes contacts under current I_i in conductor and condition I_i < I_i+1, where I=1, 2,…n is met. Number k of actuated reed relays is calculated and ratio K' of current in conductor to current I_i of first reed relay actuation is approximately defined by inserting of currents of actuation of first, k and k+1 reed relays into formula:

where I_k and (I_k+1) - current of actuation of k and (k+1) reed relay. is found at K = K' as per dependence t_av = f(K) of proper time of actuation (contacts closing) of first reed relay on ratio of current in conductor to current of first reed relay actuation, and exact value of amplitude I_m is calculated. Technical-and-economic efficiency is achieved due to more precise measuring of current and power in measuring systems during electric power transmission.

EFFECT: increase of current measurement accuracy.

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