EXPERIMENTAL STUDY OF THE MUTUAL INFLUENCES BETWEEN THE THREE PHASE CABLE'S WIRES
Abstract
The article presents the results of experimental studies of mutual influences between the wires
of the “ВБбШвнг” three-phase armored cable of 0.66 kV. The purpose of this study is to check the mathematical model of propagation of currents and voltages in power electric cables created by the authors. The
main difference between this model and existing one is the consideration of mutual electric and magnetic
influences between the cable conductors. A voltage with an effective value of 2V (active conductor) was applied to one of the conductors of the cable (conditionally - phase A) from the sinusoidal waveform generator.
When the oscillator frequency was varied from 50 Hz to 100 kHz, this voltage was maintained the same. Two
other conductors (conditionally - phase B and C) are not connected (passive conductors). The effective value
of the voltage at the end of the active and passive conductors was measured in two load modes - idle and in
symmetrical active load mode of 10 Ohm. The effective value of the current at the input of the active conductor was also measured. The frequency response of the cable was determined. The primary parameters of the
cable are calculated and mathematical modeling of the processes in the cable is performed according to the
previously created mathematical model. The experimental results with an accuracy of about 8% correspond
to the results of the experiment. Thus, the experiment demonstrates the correctness of the model and shows
the presence of significant mutual influences between the cable conductors even at low frequencies. So, in
the idle mode at 50 Hz, the voltage on the passive conductor has a value of 10% of the voltage on the active
conductor. And at high frequencies the wobble increases and at 100 kHz the voltage on the passive conductor exceeds the voltage on the active one by 1.1 times. This excess arises from the imposition of incident and
reflected waves in the conductors of the cable. The results of all experiments are presented in the article.
