Analysis of Methods for Monitoring of Existing Energy Objects Grounding Devices State at the Present Stage

Abstract

Purpose. The purpose of the work is to analyze the modern methods of control and determine the most effective ones for monitoring the state of grounding of existing energy objects in operation. Methodology. The analysis of the methods was carried on the basis of comparison the experimental and calculation methods for determining the rated parameters of the grounding of existing energy objects. Results. Significant imperfections of measurements of the rated parameters of the grounding with different methods and devices was established. It has been shown that the electromagnetic diagnostics is the most complete, which allows to comprehensively assess the current state of the grounding and establish the resistance of the grounding, the voltage on it, the touch voltage and the resistance of the contact joints. The deficiencies of electromagnetic diagnostics are established at the present stage and further directions of its perfection are determined. Originality. For the first time the comparative analysis of existing methods for monitoring the state of the grounding and directions for improving electromagnetic diagnostics was made. Practical value. The obtained results allow to choose the optimum method for monitoring the state of the grounding. Elimination of the revealed drawbacks of the method of electromagnetic diagnostics will improve the accuracy of the determination of rated parameters. References 17, tables 1, figures 4. Key words: grounding device, resistance of the grounding device, grounding device voltage, touch voltage, resistance of contact joints, electromagnetic diagnostics. Проведено аналіз і встановлено суттєві недоліки вимірювань нормованих параметрів заземлювальних пристроїв діючих енергооб'єктів при використанні різних методик та приладів. Показано, що електромагнітна діагностика стану заземлювального пристрою на теперішній час є найбільш повною, яка дозволяє комплексно оцінити поточний стан заземлювального пристрою та встановити значення опору заземлювального пристрою, напруги на ньому, напруги дотику та опору контактних з'єднань. Встановлені недоліки електромагнітної діагностики на сучасному етапі та визначені подальші напрямки її вдосконалення.Бібл. 17, табл. 1, рис. 4. Ключові слова: заземлювальний пристрій, опір заземлювального пристрою,напруга на заземлювальному пристрої, напруга дотику, опір контактних з'єднань, електромагнітна діагностика. Проведен анализ и установлены существенные недостатки измерения нормируемых параметров заземляющих устройств действующих энергообъектов при использовании различных методик и приборов. Показано, что электромагнитная диагностика состояния заземляющего устройства в настоящее время является наиболее полной и позволяет комплексно оценить текущее состояние заземляющего устройства и определить значение сопротивления заземляющего устройства, напряжения на нем, напряжение прикосновения и сопротивления контактных соединений. Установлены недостатки электромагнитной диагностики на современном этапе и определены дальнейшие направления ее совершенствования.Библ. 17, ...

ANALYSIS OF CHARACTERISTICS AND POSSIBILITIES OF HIGH-VOLTAGE COMPLEX SCIENTIFIC-&-RESEARCH PLANNING-&-DESIGN INSTITUTE «MOLNIYA» OF NTU «KHPI» FOR THE TESTS OF OBJECTS OF ENERGY, ARMAMENT, AVIATION AND SPACE-ROCKET TECHNIQUE ON ELECTRIC SAFETY AND EMC

“…showed that during SC in the power system, exceeding the permissible value of touch voltage at power facilities is fixed at more than 75 % of substations with voltage class of 110-750 kV. The most widespread in the world practice of monitoring the safe operation of electrical installations and during experimental measurement of touch voltage at power facilities is a method based on the use of the «low current method» followed by reduction of the measured touch voltage in direct proportion to the ratio of the actual SC current to the measuring current at the facility [31,32]. A method based on the application of direct SC current for these purposes is extremely dangerous both for electrical equipment and for technical personnel serving it.…”

“…The voltmeter is shunted by a resistor with resistance R В , which should be equal to the resistance of the human body (as a rule, it is taken equal to about 1000 ). The horizontal distance from the place of contact of the human feet to the plate to the metal structure of the object is assumed to be from 0.8 m to 1 m [32]. The current electrode C (see Fig.…”

Analysis of the State of the External Lightning Protection System for Operating Energy Objects

“…The work according to item 3 of the experimental stage is performed by the method of vertical electric sounding (using the Wenner or Schlumberger arrangement), and according to item 4 -by the ammetervoltmeter method (by potential drop, four-point or «62% method») [10].…”

Universal Switch for Measuring the Resistance of the Grounding Device Supports of the 110 kV Overhead Power Line

“…Studying the writings (Gracheva and Naumov, 2019;Koliushko and Rudenko, 2019;Kosyakov et al, 2019;Vinogradov et al, 2020), we discovered that there is no mathematical model to describe the process of measuring the resistance of the protective device of the 110 kV OHL supports. This is a gap in the research that aims to increase the efficiency of resistance measuring of those protective devices.…”