Research of Adaptive Line Selection Leakage Protection Based on DSP in Mine

2011 ◽  
Vol 143-144 ◽  
pp. 14-18
Author(s):  
Dan Xu ◽  
Zhan Zhang
Keyword(s):  
High Voltage ◽  
Coal Mine ◽  
Power Supply ◽  
Power Grid ◽  
Protection System ◽  
Direct Power ◽  
Supply Condition ◽  
Line Selection ◽  
Phase Sensitive

In view of the present our country coal mine high-voltage power grid widely used 6kV or 10kV cable direct power supply condition. To describe a DSP-based adaptive line selection leakage protection program of high-voltage power grid. It adopts under-compensation, adaptive random tuning and phase-sensitive comparison to judge the fault branch and achieve selective leakage protection, and make the protection system more perfect and reliable.

Study on Preventing Override Trip System for High-Voltage Power Grid of Coal Mine Underground Based on the EtherCAT

2013 ◽  
Vol 273 ◽  
pp. 389-393
Author(s):  
Yu Mei Wang ◽  
Xu Yang ◽  
Hao Zhang
Keyword(s):  
High Voltage ◽  
Coal Mine ◽  
Power Supply ◽  
Power Supply System ◽  
Short Circuit ◽  
Power Grid ◽  
Supply System ◽  
Quality Requirements ◽  
Master Station ◽  
Short Circuit Fault

When the power supply system for coal mine underground take place a short circuit fault, multilevel switch often respond at the same time. And the existing comprehensive protector cannot satisfy the real-time and rapid quality requirements of preventing override trip system for high-voltage power grid of coal mine underground. So this paper put forward the research for comprehensive protector of preventing override trip based on the EtherCAT. This paper first analyzes the principle and characteristics of the EtherCAT technology; and then puts forward the overall scheme of preventing override trip system; Finally, study and design the slave station and master station of preventing override trip system based on the EtherCAT.

Research on Centralized Short-Circuit and Leakage Protection for High-Voltage System of Underground Central Substation

2014 ◽  
Vol 494-495 ◽  
pp. 1753-1757
Author(s):  
Yan Gao ◽  
Feng Lin Ma ◽  
Guang Zhuai Dong ◽  
Hai Long Xing
Keyword(s):  
High Voltage ◽  
Coal Mine ◽  
Power Supply ◽  
Power Supply System ◽  
Short Circuit ◽  
Relay Protection ◽  
Supply System ◽  
High Voltage Power Supply ◽  
Line Selection ◽  
Longitudinal Differential Protection

According to the problems which are relay protection is difficult to adjust and when line fault occurs it will easily get override trip in the underground 6 kV power supply system in Gu Shu-yuan Coal Mine. This paper presents a centralized selective short circuit and leakage protection system. Which focuses on the analysis of the short circuit longitudinal differential protection, based on pattern recognition method of single-phase earth leakage protection principle, and completes the rapidity and selectivity of the leakage fault line selection . Through the simulation, experimental and field operation shows that the schemes can effectively improve the reliability and safety of high voltage power supply system in Gu Shu-yuan Coal Mine ,it also establishes the necessary foundation of the goal of "network relay protection" in high voltage power supply system for in China.

scholarly journals Design and Experiment of Dry-Ice Cleaning Mechanical Arm for Insulators in Substation

2020 ◽  
Vol 10 (7) ◽  
pp. 2461 ◽  
Author(s):  
Shufeng Tang ◽  
Pengfei Zhou ◽  
Xu Wang ◽  
Yue Yu ◽  
Hualei Li
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Grid ◽  
Important Application ◽  
Strength Analysis ◽  
Dry Ice ◽  
Actual Operation ◽  
High Voltage Insulation ◽  
Operation Environment ◽  
And Control

Polluted flashover of insulators has always been a crucial hidden peril to the reliability of substation for supplying electricity. At present, the insulator of the substation is mainly cleaned manually in the case of power-cut, which greatly affects the reliability of power supply and operation safety. In this paper, an insulator dry-ice mechanical arm capable of electrified working is proposed. Under the regular operation of the power grid, the operator can remotely control the mechanical arm to clean the insulators of the substation with high-pressure gas mixed with dry-ice particles. This will not only ensure the regular operation of the power grid, but also greatly protects the safety of personnel. Considering the operation environment and high-voltage working conditions of the substation, the mechanism and control system of the dry-ice cleaning mechanical arm are designed, and the motion analysis, simulation, and strength analysis of the mechanical arm are carried out. Finally, the high-voltage-insulation test of the mechanical arm and the actual operation of the substation insulator cleaning working test are carried out, which proves that this mechanical arm can adapt to the operation environment of the substation, and the working is stable, safe, and reliable, which has an important application value to solve the problem in the cleaning of the substation insulator and other electrified equipment.

Protection System Design of Overload, Short Circuit and Three-Phase Imbalance for Electromagnetic Starter in Coal Mine

2014 ◽  
Vol 1049-1050 ◽  
pp. 726-731
Author(s):  
Qing Hua Mao ◽  
Hong Wei Ma ◽  
Wang Xing ◽  
Yu Liu ◽  
Min Zeng
Keyword(s):  
Coal Mine ◽  
Short Circuit ◽  
Protective Action ◽  
Protection System ◽  
Protection Method ◽  
Three Phase ◽  
Circuit Structure ◽  
Phase Sensitive ◽  
Structure Flexibility ◽  
Hardware Circuit

An intelligent protection system of electromagnetic starter in coal mine was designed. Its controller core is PLC LM3108K. The voltage rank of protection system is 660V and the electric current rank is 400A. It has protection functions for overload, short circuit, break phase and three-phase imbalance. The system achieved overload protection by using the method of inversing time overload. Greater the overcurrent is, Shorter the time of protective action is. The system achieved short circuit protection by using phase sensitive protection method, which improves sensitivity and reliability of short circuit protection. The system can display work status parameters and fault types timely by text LCD. It has the advantages of hardware circuit structure flexibility and automatically reset after fault relieved.

The Study on Intelligent Insecticidal Lamp with LED

2014 ◽  
Vol 571-572 ◽  
pp. 985-989
Author(s):  
Xiao Dong Zhang ◽  
Li Feng Xing
Keyword(s):  
Data Acquisition ◽  
High Voltage ◽  
Power Supply ◽  
Power Grid ◽  
Solar Battery

Intelligent insecticidal lamp with LED is more efficient than ordinary insecticidal lamp. It used solar battery as the power supply, used high voltage power grid as hunting tools, used power LED which was controlled by singlechip as trapping tools for killing more insects. It could work at the night in spring or summer by data acquisition of clock chip and sensors and could automatically shut down in the rainy day or foggy day.

scholarly journals Mathematical modeling of a system for monitoring the insulation resistance of a high-voltage power grid of a hybrid vehicle

2021 ◽  
Vol 1 (1) ◽  
pp. 89-98
Author(s):  
A.N. Malyshev ◽  
◽  
YE.A. Grunenkov ◽  
V.V. Debelov ◽  
V.N. Kozlovskiy ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Monitoring System ◽  
High Voltage ◽  
Power Supply ◽  
Power Grid ◽  
Hybrid Vehicle ◽  
Insulation Resistance ◽  
Insulation Monitoring ◽  
Hardware Complex ◽  
Software And Hardware

The paper presents mathematical models and computational and analytical dependences, which make it possible to implement a system for monitoring the insulation resistance of a high-voltage power grid of a hybrid vehicle and make it possible to formulate requirements for the physical and simulation model of the software and hardware complex of laboratory tests. The purpose of the work is to determine the main functions and characteristics of the insulation monitoring system, its features, the principle of operation and methods of monitoring the insulation resistance, drawing up requirements for the simulation system. The introduction justifies the importance of monitoring in-sulation resistance and provides references to standards that regulate the requirements for the meas-urement and determination of mains failure. The block diagram of the vehicle power supply and the role of the insulation resistance monitoring system in this diagram are presented, the features of in-sulation monitoring are explained. The principle of operation of the insulation monitoring system and the use of the most common schemes are considered. The calculated dependencies for each of the presented schemes are given. These allow calculating the insulation resistance. The procedure for measuring the insulation resistance according to the ISO standard is described and the corre-sponding equations are given. For the presented circuit, a graph that explains the principle of the system's operation, when one of the keys is closed, the voltage across the measuring resistor changes with the normal insulation state of the positive and negative power supply bus of the high-voltage system is given. The conclusions provide a generalization of the presented mathematical model and formulate the requirements for the software and hardware complex, which allows simulation and mathematical modeling of electrical systems and their components in various operating modes. The paper explains the features of the software and hardware complex that allows to simulate changes in the insulation resistance and faults of the high-voltage power supply network for a vehicle with a hybrid power plant.

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