Detection of insulation defects in the wire through measuring changes in its capacitance

Vavilova, Galina; Ryumkin, Alexandr

doi:10.1088/1757-899x/289/1/012017

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…The current passing through the inductance coil is 350 mA. Equation (4) shows that the magnetic flux of the coil is 52 mWb. This is 1,000 times greater than the magnetic flux used in the previous experiment with a permanent magnet.…”

Section: Study Of the Magnetic Field Effectmentioning

confidence: 99%

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Study of the Effect of Low-Frequency Interference on Resistance-to-Voltage Converter in Cable Insulation Testing

Yermoshin

Yakimov

Goldshtein

2019

MSF

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The study focuses on the effect of low-frequency noise on resistance converter of teraommeters to test cable insulation. A mathematical pendulum was used to simulate low frequency electromagnetic interference. It was found that the greatest effect is exerted by dynamic effects of electrostatic charges that accumulate on the printed circuit board, electronic components, structural elements of the resistance-to-voltage converter, and on the test cable sheath. The effect of constant and alternating magnetic fields on measurement of resistance of insulating materials is insignificant.

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Section: Study Of the Magnetic Field Effectmentioning

confidence: 99%

“…Testing of insulation properties of cable products is a major problem faced both in manufacture and operation of cables since natural aging and degradation of the cable shielding cause electrical accidents. The most informative parameter to assess the quality of cable insulation is resistance [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Low-Frequency Interference on Resistance-to-Voltage Converter in Cable Insulation Testing

Yermoshin

Yakimov

Goldshtein

2019

MSF

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“…A number of problems arising during monitoring the cable insulation quality by electrical resistance are associated with a large value of the measured resistance. One of the most important problems is the sensitivity of the input circuits of the measuring device (teraohmmeter) to low-frequency interference [1][2][3][4][5][6], which occurs during mutual movement of electrostatic charges that accumulate on the surface of the measuring device, cable and operator.…”

Section: Introductionmentioning

confidence: 99%

Double-channel resistance-to-voltage converter for cable teraohmmeters

Yermoshin¹,

Yakimov²,

Goldshtein³

2020

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The paper considers a teraohmmeter resistance converter to monitor cable insulation with an additional input amplifier that emits a low-frequency interference signal. Adaptive algorithms for a double-channel converter circuit to compensate for low-frequency interference are proposed. There are considered algorithms using minimax criteria and linear approximation method for estimation of interference influence. It is shown classification of algorithms according to industrial frequency interference filtering method and signal observation interval. There were investigated two ways of interference application: step signal from a DC voltage source up to 300 V and fading harmonic signal from an AC voltage source and amplifier up to 300 V. A doublechannel circuit of the resistance-to-voltage converter is found to provide a 2-fold increase in the signal-tonoise ratio in comparison with a single-channel circuit. It is shown that the maximum deviation of readings for the single-channel circuit exceeds 20 % (up to 32 %) in short-term exposure to interference with amplitude of up to 300 V. At the same time, the maximum deviation for the double-channel circuit can attain 17 %, but it does not exceed 20 %. According to GOST 3345–76, the insulation resistance measuring error in the range of 10 GΩ to 100 TΩ should not exceed 20 %.The advantage of the proposed double-channel converter is the possibility to develop new algorithms to eliminate the dependence of readings on interference effects.

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