Continuous condition monitoring of the electrical insulation of AC motors without disconnection

Grebchenko, N.V.; Smirnova, M.; Kozhukhar, A. V.

doi:10.1109/speedam.2014.6871941

Cited by 4 publications

(4 citation statements)

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“…Відомий метод [1] забезпечує визначення появи замикання та значення опору дефекту ізоляції на підставі розв'язання ітераційним методом системи рівнянь стану мережі, створеної за результатами вимірювання векторів параметрів режиму. Відповідно до методу на рис.1 наведена схема заміщення приєднання навантаження.…”

Section: розвязання системи рівнянь стану електричної мережі з дефект...unclassified

“…Але метод [1] не дозволяє визначати відстань до точки замикання, а у загальному випадку для розв'язання системи рівнянь стану ітераційними методами може знадобитись певний час. В розглянутому в [2] способі пошуку пошкодження в електричній системі, яка розподілена на складові частини, використовуються фазові змінні, якими в момент пошуку є контрольовані параметри.…”

Section: розвязання системи рівнянь стану електричної мережі з дефект...unclassified

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Solution of the System of State Equations of an Electrical Network With an Insulation Defect or With a Single-Phase Ground Fault

Grebchenko,

Kyrushok

2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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A method for solving the system of equations of the state of an electric network with an isolated neutral is proposed, which is created based on the results of measuring the current vectors of the load connection phases and the phase voltages in relation to the ground, which allows to determine the occurrence of insulation defects, including single-phase short circuits to the ground, and also to determine distance to the single-phase ground fault location. In the well-known system of equations of the state of the electrical network, the parameters of the longitudinal resistance of the line phases are additionally taken into account, which consist of the resistance to the shorting point and the resistance beyond the point of shorting the phase to the ground. Due to simplification, the replacement circuit with additional line phase resistances turns into exactly the same circuit as the circuit without taking into account the line phase resistances, due to which the determination of the line resistance to the closing point is performed using a known algorithm. The accuracy of determining the distance to the closing point was evaluated on the mathematical model of the network node. It was established that the main factors affecting accuracy include the ratio of the capacitance values of the line and the network, the distance to the shorting point, as well as the resistance at the shorting point. When using automatic correction, the error in determining the distance to the shorting point with a resistance of 0.1 Ohm does not exceed 0.9% over almost the entire length of the line. Analytical expressions for determining insulation conductivity and the distance to a local insulation defect are proposed. The elements of the algorithm for determining the distance to the location of a local insulation defect and the results of the accuracy assessment of the method for the specific case of a phase-to-ground fault, in which the transient resistance at the fault location is not taken into account, are given. Automatic selection of circuits with low resistance at the point of the circuit is ensured by checking the value of the determined active resistance, as well as checking the voltage of the damaged phase in relation to the ground.

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Section: розвязання системи рівнянь стану електричної мережі з дефект...unclassified

Solution of the System of State Equations of an Electrical Network With an Insulation Defect or With a Single-Phase Ground Fault

Grebchenko,

Kyrushok

2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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“…Generally speaking, in order to increase the robustness of the RPA algorithms for each SN, and SсeN overlap area, it is desirable to define its own TS information sensor. For this, according to information theory, it is necessary to supply an excess amount of information for the purposes of rechecking, determining errors, recovering information in case of errors [15,16], [17,18]. In practice, this important property is not implemented in the RPA devices.…”

Section: Objectives Of the Studymentioning

confidence: 99%

“…In the real OCP, there are third-party processes that are not associated with typical SN situations and SceN scenarios [18,19], [2,21]. They can be present for a long time; they are registered by some TS in the RPA.…”

Section: Objectives Of the Studymentioning

confidence: 99%

Detecting development scenarios of dynamic events in electric power networks smart-grid Part1 “Method”

Sivokobylenko¹,

Nikiforov²,

Zhuravlov³

2021

AAIT

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A method for constructing a semantic S-detector for the senior hierarchical level of pattern recognition in dynamic objects is proposed. The S-detection method is based on a uniform synthesis of all hierarchically subordinate detectors and information preparation schemes, based on the tasks of the upper hierarchical level of recognition of scenarios for the development of processes in an object. The method can be used to solve problems of relay protection, emergency control automation, to identify rare events in impulse, short-term input signals when implementing the concept of developing of electric power smart-grid. The synthesis of the Sdetector of scenarios for the development of transient processes was the result of the development of a structural-information SImethod for processing information components. A mathematical SI-model is presented that allows you to control the mutual correspondence of the structure of the formation tree in the object and the device recognition tree. The task is to improve the stability of the device recognition algorithm. The Part 1 describes the theoretical provisions of the application of the recognition method. It is proposed to unify the trees for generating recognition scenarios in the industry, similar to the IEEE high-voltage network diagrams. The S-detector algorithm based on the formation of a semantic signal and on the selective search for the required amount of information for automatic decision-making is presented. The facts of the appearance of elementary information events in the input signals of the detector are controlled by Ξ,H-selectivity windows, which are sequentially opened depending on the previous development of events. The block diagram of the S-detector of the scenario is presented, which can be synchronous, multichannel, with a high signal processing speed, without losing rapidly changing information when slow and infraslow information is detected. Combines useful properties of instantaneous and inertial detection algorithms. The output of the S-detector is a series of responses with different weights. This allows elementary detectors to be combined into sequential chains at different hierarchical levels of recognition. Part 2 provides an example of the application of the scenario detection method to solve the problem of increasing the stability of the operation of a selective protection relay against single-phase earth faults based on medium-frequency signals in 6-35 kV networks with an arc suppression Petersen’s coil. The results of modelling the operation of the S-detector algorithm on the signals of real emergency files recorded by high-frequency recorders of transient processes in the network are presented.

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Condition Assessment of High Voltage Instrument Transformers: A Bibliometric Analysis and Literature Review

Madrid-Chirinos

Romero

Ontiveros

et al. 2022

2022 IEEE Biennial Congress of Argentina (ARGENCON)

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Continuous condition monitoring of the electrical insulation of AC motors without disconnection

Cited by 4 publications

References 0 publications

Solution of the System of State Equations of an Electrical Network With an Insulation Defect or With a Single-Phase Ground Fault

Solution of the System of State Equations of an Electrical Network With an Insulation Defect or With a Single-Phase Ground Fault

Detecting development scenarios of dynamic events in electric power networks smart-grid Part1 “Method”

Condition Assessment of High Voltage Instrument Transformers: A Bibliometric Analysis and Literature Review

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