Method for the diagnosis of high-voltage dielectric elements during operation based on dynamic registration of electromagnetic radiation

Иванов, Д. А.; Galieva, Tatyana; Sadykov, M. F.; Golenischev-Kutuzov, A. V.; Naumov, Anatoly Aleksandrovich

doi:10.1051/e3sconf/202021601061

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…The recording high-intensity electric fields method is based on the electro-optical effect [48][49][50]. The physical principle of electro-optical sensor operation is based on the refractive index change of a laser beam passing through a periodic domain structure in an electric field with an intensity E. This effect is called the "linear electro-optical effect" or "Pockels effect".…”

Section: Diagnostics With An Electro-optical Sensormentioning

confidence: 99%

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

et al. 2021

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The article describes a complex of non-contact methods for remote diagnosis of high-voltage insulators as well as the two-channel method for remote diagnostics of the operating state of high-voltage insulators, based on the registration of partial discharges by electromagnetic and acoustic sensors. The presented device allows visual inspection and searches for faulty high-voltage equipment and a remote non-contact method of recording high-intensity electric fields of industrial frequency and their spatial distribution based on the electro-optical effect. The scheme of using the system for monitoring and diagnosing the technical condition of high-voltage support insulators of open switchgear is described. The results of experimental studies confirm the possibility of industrial applicability of the proposed method for non-contact remote diagnostics of the state of high-voltage insulators under operating voltage.

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Section: Diagnostics With An Electro-optical Sensormentioning

confidence: 99%

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

et al. 2021

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Distributed automated control and protection system for power lines with any degree of longitudinal compensation

2021

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With longitudinal compensation of the reactance of the line, the problem of its protection against overcurrents arises from the point of view of relay protection. The problem is relevant with a greater degree of compensation. When compensating more than 50% of the reactance of the line, the protection of the power transmission line becomes practically impossible due to the failure or false operation of all existing types and forms of protection [1, 2]. Therefore, at present, the compensation of the line reactance is, as a rule, no more than 50% [3, 4], which does not allow the full potential of the line in terms of its transmission capacity to be revealed. The purpose of this study was to develop and test a new relay protection algorithm to be able to solve the above problem. The studies were carried out using modeling techniques in the PS CAD package, where a power transmission line with longitudinal compensation and an algorithm to protect it from internal damage were built. When carrying out the research, the work was carried out on the protection algorithm of the power transmission line with longitudinal compensation in the static mode without transferring electricity between substations and without the transmission mode along the active power line in both directions. It is shown that in order to determine the location of the damage, it is possible to use the criterion of the angle of the active component of the short-circuit current, which depends exclusively on the voltage angle and does not depend on the reactive parameters of the electrical network. The simulation result showed correct operation in all investigated modes. The algorithm described in the article showed quite satisfactory results, which makes it possible to protect the power transmission line with any degree of longitudinal compensation.

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Problems of Insulation Diagnostics of Power Equipment by the Method of Partial Discharges

Usachev

Kubarev

2021

E3S Web Conf.

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Target. High information value and reliability of diagnostics of isolation by partial discharges. Methods. Simulation of PD in Multisim and calculation of electrical fields of insulation defects by finite element method in the program ComSol. Results. A strong influence of the power supply on the value of voltage surge in case of emergency has been established. The method of adjustment of this influence is proposed. It was found that the oscillatory form of the PD is mainly determined not by the parameters of the insulation defect, but by the parameters of the energy object in which this defect is observed. Method for separation of aperiodic signal of PD from oscillatory component of system transient process in PD is proposed. It is shown that in operating turbogenerators and power transformers the unambiguous connection between the phase of PD occurrence and the voltage of PD occurrence is broken. Method of determination of PD occurrence place in slot part of turbogenerators is proposed. It is shown that in order to increase the reliability of comparing PD in polymer insulation of power cables of different voltage classes and geometric dimensions, when calibrating the measuring system, it is necessary to take into account the speed of propagation of the PD pulse through the cable and the capacity of the cable length unit. The concept of a corrective coefficient for calibration has been introduced and a method for determining it has been proposed. Conclusions. Taking into account the differences in PD parameters in real objects of the electric power industry, proposed in the article, from the parameters obtained in the standard laboratory model of the PD should increase the information and reliability of the PD method, as well as make it possible to conduct a comparative analysis of the results obtained under various observation conditions.

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Method for the diagnosis of high-voltage dielectric elements during operation based on dynamic registration of electromagnetic radiation

Cited by 5 publications

References 16 publications

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

Distributed automated control and protection system for power lines with any degree of longitudinal compensation

Problems of Insulation Diagnostics of Power Equipment by the Method of Partial Discharges

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