Розрахунок процесу термічного ураження залізобетонних опор струмами однофазного замикання на землю
Abstract
UDC 536.21
CALCULATION OF THERMAL SHOCK OF REINFORCED CONCRETE PILLARS BY CURRENTS SINGLE-PHASE GROUND FAULT
A. KVITSYNSKYY, O. SHELIMANOVA
When single-phase ground fault (OZZ) concrete pillars can be heated to high temperatures (200 0 C and above), which causes thermal destruction of the pillars’ material. Therefore, the task of calculating of changes over time in key indicators of thermal shock process of concrete pillars by currents of single-phase ground fault in networks with isolated neutral is relevant.
Assuming that the thermal destruction process can precede relatively quickly, heat exchange between the earth and the air and the diffusion of moisture in the ground will be ignored.
Buried in the ground part of the reinforced concrete pillars is replaced on the model - equivalent hemisphere. This will provide the same first approximation the current density at the surface of the reinforced concrete pillars and models and will consider the process of thermal destruction recesses of support as transient electro-dimensional process due to evenly distributed and variable time sources of heat. Characteristics of the reinforced concrete pillars buried in the ground (temperature and conductivity) will be considered the same.
Changing the resistance layer, which is located near concrete poles, causes a redistribution of power between the different layers of the earth and the ground temperature heating layers (Fig. 1). The nature of the process while significantly depends on the thermal characteristics of the ground (temperature characteristics - dependence of resistivity on temperature, initial values of temperature and humidity, specific heat capacity and thermal conductivity, moisture conductivity, etc.) and the value of current ground fault circuits.
References
Правила технічної експлуатації електроустановок споживачів. – Х. : Форт, 2006. – 272 с.
Кутателадзе С. С. Теплопередача и гидравлическое сопротивление : справ. пособие / С. С. Кутателадзе. – М. : Энергоатомиздат, 1990. – 367 с.
Downloads
Published
Issue
Section
License
Relationship between right holders and users shall be governed by the terms of the license Creative Commons Attribution – non-commercial – Distribution On Same Conditions 4.0 international (CC BY-NC-SA 4.0):https://creativecommons.org/licenses/by-nc-sa/4.0/deed.uk
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
