The Factors of the Influence on the Touch Voltage From the Review of the Development of Recommendations for the Reconstruction of the Grounding Device

Koliushko, D. G.; Руденко, С. С.

doi:10.15407/techned2019.03.029

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…-велике значення струму ОЗЗ (в Україні може сягати 60 кА) [9]; -тривалий час дії пристроїв захисту. Наприклад, якщо час дії захисту 0,1 с, то U t буде дорівнювати 500 В, а при часі дії захисту ≥1 с -U t = 65 В (див.…”

Section: вступunclassified

“…рис. 1); -розташування електроустановки з малою діагоналлю ЗП у стислій забудові (при великому значенні струму ОЗЗ виникає значна напруга на ЗП) [9]; -високий питомий опір всіх шарів ґрунту (неефективність встановлення вертикальних заземлювачів з метою зменшення напруги на ЗП) [10] або досить суттєва товщина шару з великим питомим опором (встановлення вертикального заземлювача на потрібну глибину може бути недоцільним); -співвідношення значень питомих опорів першого та другого шарів ґрунту значно більше одиниці (розподіл еквіпотенціалей є дуже щільним, відповідно й значення напруги дотику буде високим) [9]; -низьке значення опору розтікання струму з ніг людини (опору основи R f ) [11]…”

Section: вступunclassified

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Selection of the Technique of Arrangement of Equipment Service Area to Provide the Permissible Touch Voltage

Koliushko¹,

Руденко²,

Istomin³

2022

Вісник НТУ "ХПІ"

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Ensuring the permissible value of the touch voltage in operating electrical installations is a necessary condition for the electrical safety of personnel and third parties. In the study, based on literature data, it is analyzed in which cases it is impossible to achieve the permissible values of the touch voltage only with the help of the design of the grounding system. It is shown that ensuring the permissible value of the touch voltage is performed by arranging in a special way both the place of operational maintenance of the equipment and the territory of the opendoor switchgear. It is study the selection a technique of arrangement of the service place to ensure the permissible value of the touch voltage on the equipment of the opendoor switchgear during a single-phase short circuit to the ground. When performing the work, statistical methods of analysis, the ammeter-voltmeter method for experimental determination of the resistance of the base according to the method of Research&Design institute "Molniya" NTU "KhPI" were used. For the first time, on the basis of statistical data, the necessity of arrangement of equipment service area to ensure an acceptable value of touch voltage at operating substations of class 110 (150) kV and 330 (220) kV was analyzed. The spread of base resistance (ground resistance of human foot) values was determined experimentally. The most common ways of arrangement of equipment service area were analyzed: technological (natural), namely: a reinforced concrete pool with a layer of crushed stone, a cable channel or tray, asphalt paths and specially created (artificial) ones, namely: a metal structure , a layer of crushed stone, reinforced concrete slabs, concrete slabs without scaffolding, paving slabs, concrete slabs (paving slabs) with gravel admixtures, polymer sand slabs. The base resistance was measured for the listed techniques at operating substations. The advantages and disadvantages of various arrangement of equipment service area are determined, and recommendations for their use are provided.

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Section: вступunclassified

Selection of the Technique of Arrangement of Equipment Service Area to Provide the Permissible Touch Voltage

Koliushko¹,

Руденко²,

Istomin³

2022

Вісник НТУ "ХПІ"

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“…A number of factors that significantly affect the value of the touch voltage were determined in [8]: the design of the GS, the electrophysical characteristics of the soil (EPC) and the resistance of the base at the place of maintenance of the equipment, etc. In this work, we will consider in detail the dependence of the touch voltage on the value of the ground fault current.…”

mentioning

confidence: 99%

“…Also, during a short-circuit, as a rule, part of the current flows in the neutral, which is not taken into account when measuring by this method. This component of the methodological measurement error is considered in detail in [8].…”

mentioning

confidence: 99%

Determination of the scope of the experimental-calculation method for measuring the touch voltage

Koliushko

Руденко

Saliba³

2023

Electrical Engineering & Electromechanics

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The work is devoted to the improvement of methods for determining the normalized parameters of the grounding system (GS) of operating power stations and substations. The aim of the work is determination of the scope of the experimental-calculated method for measuring the touch voltage, depending on short-circuit (SC) current value for the given dimensions of the GS and the type of soil. Methodology. The study analyzed the non-linear effect of the SC current value on the touch voltage, taking into account such factors as the GS size and the soil type. The calculation used statistical data on the GS size and the characteristics of the soil obtained by monitoring the GS state of 585 operating electrical substations with a voltage class of 110-750 kV using the induction method and the method of vertical soil sounding, respectively. For the calculation, a mathematical model of a non-equipotential GS located in a three-layer semiconductor space with plane-parallel boundaries was used, this model was developed using the method of integro-differential equations. Results. To determine the scope of the method, in this work it is proposed to use the linearity criterion, which is determined due to the ratio of the constant of reduced touch voltage to the current value. The example shows the method for determining the threshold minimum and maximum values of the measuring current of the soil, in the range between which the measurements by experimental-calculated methods are impossible. A table of threshold current values has been formed and recommendations have been developed on the possibility of using experimental-measuring methods for determining the touch voltage depending on the GS size and soil characteristics.

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The Factors of the Influence on the Touch Voltage From the Review of the Development of Recommendations for the Reconstruction of the Grounding Device

Cited by 2 publications

References 5 publications

Selection of the Technique of Arrangement of Equipment Service Area to Provide the Permissible Touch Voltage

Selection of the Technique of Arrangement of Equipment Service Area to Provide the Permissible Touch Voltage

Determination of the scope of the experimental-calculation method for measuring the touch voltage

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