Читать книгу English Original Reader for Technical Students. Power transformers: short-circuit testing, monitoring systems (Smart Grid) - Александр Юрьевич Хренников - Страница 10

12) The form of distribution law of measurement random error, the diagram of the topographic classification of the laws of distribution, values of antikurtosis and entropy coefficient К are determined.

13) The value of quantile coefficient for the concrete identified distribution is calculated:

Table 1.1.

14) The error in the determination of root-mean-square deviation (RMSD) of random error distribution is calculated:

(1.24)

where: is the kurtosis of distribution;

n is the number of measurements.

15) The value of the confidence interval of a random error of measurement of short-circuit transformer inductance is determined:

(1.25)

where: t is the quantile coefficient;

is the measurement’s root-mean-square deviation (RMSD) of X50 value.

16) Obtained result of measuring the deviation of short-circuit transformer inductance is derived to the printing in the following form:

(1.26)

where: ΔX50 is the deviation of X50 value from base value of short-circuit transformer inductance Х0;

Δconf is the value of the confidence interval of a random error of measurement of short-circuit transformer inductance from (1.25).