Development of method to improve efficiency of residual current device under 1000 V on excavators of mining enterprises

Utegulov, Bolatbek; Utegulov, Arman; Uakhitova, Aigul

doi:10.1134/s1062739116020477

Cited by 6 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the change in the value of the random relative root‐mean‐square error from the connected conductance value, the conductance value is determined to ensure sufficient accuracy in determining the insulation parameters of the electrical network, taking into account the achievement of measuring safety for the values of voltage modules. It is also essential that the selected additional conductance does not violate the operating mode of electrical receivers and does not negatively affect the reliability of the elements in the internal power supply system during the work performance in electrical installations to determine the insulation parameters [7].…”

Section: Discussionmentioning

confidence: 99%

“…The analysis of the root‐mean‐square error of Equations (9), (10) with indirect measurements is shown in the thesis [6, 7], where «the minimum random relative root‐mean‐square error will be at

{U_{A1}} = 0,5{U_N}\;

. When using a measuring voltage transformer, voltmeters with an accuracy class of 0,5, the random relative root‐mean‐square error in determining the conductance and susceptance of the electrical network insulation does not exceed 5% with the variation range of the phase‐to‐earth voltage modulus within limits

{U_{A1}} = ( {0,3 - 0,75} ){U_N}\;

».…”

Section: The Theoretical Basismentioning

confidence: 99%

See 1 more Smart Citation

Mathematical description of the method for ungrounded AC systems to determine the network insulation

Kurabayev

Suvorov

Utegulov

et al. 2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

For the safety of humans and animals in the vicinity of single‐phase earth faults in ungrounded AC systems, the development of methods for monitoring the condition of insulation and protection against electric shocks is an important issue. This paper presents a method for determining insulation parameters in ungrounded AC systems, which provides: (1) Satisfactory accuracy; (2) easy measurements of the voltage modules magnitude; (3) safety when working in electrical installations. The proposed method is based on measuring the zero‐sequence voltage module and phase‐to‐earth voltage module, as well as the angle of phase‐to‐earth voltage vector and zero‐sequence voltage vector before and after connection of additional conductivity between a phase and the earth. In addition, the obtained insulation parameters enable the zero‐sequence current to be decomposed into an active and reactive component, thus ensuring accurate compensation of capacitive currents. By monitoring the state of the active conductivity value, the value of the single‐phase earth‐fault current can be determined at an early stage and the relay protection can thus be correctly set. Consequently, by knowing the insulation condition parameters, the single‐phase earth‐fault currents can be monitored and reduced more effectively, and thus the step voltage, which determines the degree of safety.

show abstract

Section: Discussionmentioning

confidence: 99%

{U_{A1}} = 0,5{U_N}\;

{U_{A1}} = ( {0,3 - 0,75} ){U_N}\;

».…”

Section: The Theoretical Basismentioning

confidence: 99%

Mathematical description of the method for ungrounded AC systems to determine the network insulation

Kurabayev

Suvorov

Utegulov

et al. 2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…Czaja analyzed RCDs with different designed release systems and illustrated their effects on release frequency range [9]. Utegulov et al have developed a method to increase the efficiency of RCDs below 1000 volts based on direct installation [10]. Porta et al performed a study on faulty switches of RCDs in circuits feeding electronic loads [11].…”

Section: Introductionmentioning

confidence: 99%

The Time Response Analysis of a Hybrid Electronic Switch and Residual Current Devices System

2024

Teh. vjesn.

View full text Add to dashboard Cite

Residual current devices are vital as they are used to protect humans from electric shocks and fire hazards. These devices detect the residual current in the grid, open the mechanism, and leave the grid without voltage. In this study, the time response of a newly designed hybrid system consisting of an electronic switch system and a residual current device to protect humans from hazards has been analyzed. A model consisting of capacitors and resistors has been used to simulate the human body. In the designed system, the average response time was found to be 1.37 ms, which operates with an average of 6.43 times faster than a conventional residual current device. The results of the study illustrated that the designed system leaves the circuit voltage-free much faster than a conventional residual current device and is more effective in protecting human life.

show abstract

“…Studies on the condition of insulations in the development of coal deposits and mining open pits in short networks up to 1000 V on excavators are not sufficient to be produced. Installed residual current devices in short networks up to 1000 V excavators have not been studied in relation to the criteria for electric normal and emergency operating modes [17].…”

Section: Introductionmentioning

confidence: 99%

Special Issues of Ensuring Electrical Safety in Networks with Isolated Neutral Voltage up to 1000 V at Mining Enterprises

Utegulov¹

2019

Industrial Engineering

View full text Add to dashboard Cite

In the practice of operating mining machines and complexes, there are no effective ways to monitor the state of insulation and protect a person from electric shock in a network with voltages up to 1000 V. There is a risk of electric shock with a fatal outcome for personnel. Consequently, the issue of development of methods for monitoring the state of insulation and protection against electric shock in a network up to 1000 V for mining machines and complexes is relevant and urgent. The existing protection of a person from electric shock effectively works provided that the total insulation resistance is commensurate with the capacitive insulation resistance of the phases of the electrical network relative to the ground. But, at mining enterprises, a violation of ratio takes place between the total and capacitive insulation resistance of the network, which leads to failure of the protection against electric shock. Therefore, to ensure electrical safety criteria when operation of electrical installations in the network is up to 1000 V, it is necessary to consider the insulation condition and the technical capabilities of available protection against electric shock in a complex.

show abstract

Development of method to improve efficiency of residual current device under 1000 V on excavators of mining enterprises

Cited by 6 publications

References 2 publications

Mathematical description of the method for ungrounded AC systems to determine the network insulation

Mathematical description of the method for ungrounded AC systems to determine the network insulation

The Time Response Analysis of a Hybrid Electronic Switch and Residual Current Devices System

Special Issues of Ensuring Electrical Safety in Networks with Isolated Neutral Voltage up to 1000 V at Mining Enterprises

Contact Info

Product

Resources

About