SU1465819A1 - Method of measuring charge relaxation time constant in dielectric fluid - Google Patents

Abstract

The invention relates to electrical measurements, in particular to the field of determining the electrophysical properties of dielectric fluids, and can be used to determine a constant relaxation time of the charge. The invention relates to electrical measurements, in particular to the field of determining the electrophysical properties of dielectric liquids, and can be used to determine the constant relaxation time of the charge in petroleum products. The purpose of the invention is to improve the accuracy of the determination of the constant time by means of decreasing the magnitude and duration of the effect of the applied voltage. The imprint of the method is as follows. . yes in petroleum products. The aim of the invention is to improve the accuracy of the determination of the time constant by reducing the magnitude and duration of the effect of the applied voltage. The method consists in that the test liquid is placed between the plates of a flat capacitor, to which a voltage is applied through an additional capacitor and the time to reach a given voltage on an additional capacitor, and the time constant is determined by the formula given in the description and: the shadows. Applying voltage to the plates of the measuring capacitor through an additional capacitor leads to the establishment of voltages on the capacitors according to their capacitance. Over time, due to the influence of the conductivity of the liquid, the voltage across the measuring capacitor drops, and on the additional one it increases. c g The test liquid is placed between the plates of the flat capacitor,; „; A voltage amplitude voltage jump is applied through an additional capacitor. At the initial moment of time, a voltage is applied to the additional Topv condensate, corresponding to the ratio of capacitors capacitors. Over time, AFTER the conductivity of the liquid, the voltage across the additional capacitor changes according to the i 1, C. –s, O, (1) OJ sd and and.

Description

3 1465819

where (is the capacity of an additional conical device, in which the probe is located; the fluid to be blown is placed between the OS - the capacitance of the measuring capacitors of the flat capacitor, on

capacitor with a liquid dielectric, which serves the voltage U, from the trick, which is characterized by

t - constant relaxation time - to increase accuracy, voltage

charge in liquid, on the plates of the measuring condensate. Measurement time t rise napr-T is supplied through additional capacitance on additional capacitor JQ Capacitor, measure time t is reached the specified value U, the value on additional capacitor

is determined by the formulated voltage U, and the constant

/ h Cat .. time is determined by the formula

(, in -. with t (2) I

(C, s) in (ij7uHc; - -; rJ 15-y -. 9it-,

It is also possible to measure the voltage U at a complementary capacitor at a time point (C, + C-) In men t, and calculate the time constant t by the formula –D мm capacitance of an additional co- (2). 20 capacitors;

Formula of the invention of i measuring const. Method of determining constant time. sensor with a liquid dielectric of charge relaxation in a dielectric.

Claims (1)

Claim The method for determining the relaxation time constant of charges in a dielectric fluid, in which the test fluid is placed between the plates of a flat capacitor to which voltage U _{o is} applied, characterized in that, in order to improve accuracy, the voltage on the plates of the measuring capacitor is supplied through an additional capacitor, measure time t of reaching the specified voltage U at the additional capacitor, and the time constant ΐ is determined by the formula I g- ₌ ________Cit_____________ (s, + cf (u; -lw; + c7) ·] where C _A is the capacity of the additional capacitor; C ^ is the capacitance of the measuring con. a dielectric capacitor.