Debugging and Analysis of Relay Protection Device for Two-Phase Grounding Fault in Power System : Taking WHX 803 Microcomputer Line Protection Device as an Example

2019 ◽  
Author(s):  
Xia Meng ◽  
Guangming Jin ◽  
Xiaochun Zhang ◽  
Fengtian Tang
Keyword(s):  
Power System ◽  
Relay Protection ◽  
Protection Device ◽  
Two Phase

Two-Phase Short Circuit in the Power Grid Powered by a Transformer with a Y/Δ-11 Winding Connection

2020 ◽  
pp. 25-30
Author(s):  
Aleksandr S. Serebryakov ◽  
Vladimir L. Osokin ◽  
Sergey A. Kapustkin
Keyword(s):  
High Speed ◽  
Short Circuit ◽  
Relay Protection ◽  
Electric Circuit ◽  
Operational Reliability ◽  
Research Purpose ◽  
Industrial Complex ◽  
Two Phase ◽  
Short Circuit Currents ◽  
Secondary Winding

The article describes main provisions and relations for calculating short-circuit currents and phase currents in a three-phase traction transformer with a star-triangle-11 connection of windings, which feeds two single-phase loads in AC traction networks with a nominal voltage of 25 kilovolts. These transformers provide power to the enterprises of the agro-industrial complex located along the railway line. (Research purpose) The research purpose is in substantiating theoretical equations for digital intelligent relay protection in two-phase short circuits. (Materials and methods) It was found that since the sum of instantaneous currents in each phase is zero, each phase of the transformer works independently. We found that this significantly simplifies the task of analyzing processes with a two-phase short circuit. In this case, the problem of calculating short-circuit currents in the traction network can be simplified by reducing it to the calculation of an ordinary electric circuit with three unknown currents. (Results and discussion) The article describes equations for calculating short-circuit resistances for one phase of the transformer when connecting the secondary winding as a star or a triangle. The currents in the phases of the transformer winding at short circuit for the star-triangle-11 and star-star-with-ground schemes are compared. It was found that when calculating short-circuit currents, there is no need to convert the secondary winding of the traction transformer from a triangle to a star. (Conclusions) It was found that the results of the research can be used in the transition of relay protection systems from electromagnetic relays to modern high-speed digital devices, which will increase the operational reliability of power supply systems for traction and non-traction power consumers.

scholarly journals A Neural Network-Based Model Reference Control Architecture for Oscillation Damping in Interconnected Power System

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3653
Author(s):  
Uddin ◽  
Zeb ◽  
Zeb ◽  
Ishfaq ◽  
Khan ◽  
...  
Keyword(s):  
Neural Network ◽  
Power Systems ◽  
Power System ◽  
Performance Indicator ◽  
Stable Condition ◽  
External Perturbation ◽  
Absolute Error ◽  
Unified Power Flow Controller ◽  
Two Phase ◽  
Model Reference

In this paper, a model reference controller (MRC) based on a neural network (NN) is proposed for damping oscillations in electric power systems. Variation in reactive load, internal or external perturbation/faults, and asynchronization of the connected machine cause oscillations in power systems. If the oscillation is not damped properly, it will lead to a complete collapse of the power system. An MRC base unified power flow controller (UPFC) is proposed to mitigate the oscillations in 2-area, 4-machine interconnected power systems. The MRC controller is using the NN for training, as well as for plant identification. The proposed NN-based MRC controller is capable of damping power oscillations; hence, the system acquires a stable condition. The response of the proposed MRC is compared with the traditionally used proportional integral (PI) controller to validate its performance. The key performance indicator integral square error (ISE) and integral absolute error (IAE) of both controllers is calculated for single phase, two phase, and three phase faults. MATLAB/Simulink is used to implement and simulate the 2-area, 4-machine power system.

Efficiency of a Combined Desalination and Power System Utilizing a Two-Phase Flow Multistream Heat Exchanger

2016 ◽  
Vol 38 (11-12) ◽  
pp. 1000-1007 ◽  
Author(s):  
Alireza Hosseini Araghi ◽  
Mehdi Khiadani ◽  
Kamel Hooman ◽  
Gordon Lucas
Keyword(s):  
Heat Exchanger ◽  
Power System ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Improvement of Operation Characteristics of One-coil PMA Applied to Protection Device in Power System

2021 ◽  
Vol 70 (12) ◽  
pp. 2041-2045
Author(s):  
Seung-Jin Kim ◽  
Jae-Ho Hur ◽  
Tae-Hyun Kim ◽  
Young-Il Kim ◽  
Hosung Jung
Keyword(s):  
Power System ◽  
Protection Device ◽  
Operation Characteristics

Optimizing the Allocation of the Relay Setting Related to Power Grid and over Frequency Generator Tripping Scheme

2014 ◽  
Vol 986-987 ◽  
pp. 404-411
Author(s):  
Qi Yang ◽  
Xin Zeng ◽  
Qing Kui Guo ◽  
Yong Yu Yuan ◽  
Jian Jun Sun ◽  
...  
Keyword(s):  
Power System ◽  
Steam Turbine ◽  
Power Unit ◽  
Program Analysis ◽  
Thermal Power ◽  
Protection Device ◽  
Power Network ◽  
Whole Process ◽  
Islanding Operation ◽  
Frequency Generator

Through the summary of typical accident, the problem between the over speed protection device of thermal power unit steam turbine and over frequency generator tripping measure is analyzed in island operation of sending ends of regional grid. The optimizing allocation principle between over frequency generator tripping measure and over speed protection equipment is put forward. By a variety of program analysis and comparison, the optimizing scheme is given. Finally, the typical models of thermal power unit steam turbine over speed protection are established in software. Based on a practical power system as an example, the whole process of islanding is simulated. Checking the coordination with existing over frequency generator tripping measure and the relay setting related to power network in the islanding operation, the validity and practicability of the optimal scheme and principle are analyzed. With the method, the regional grid will remain safe and stable.

scholarly journals Power-system protection device with IoT-based support for integration in smart environments

PLoS ONE ◽  
2018 ◽  
Vol 13 (12) ◽  
pp. e0208168 ◽  
Author(s):  
Octavian Mihai Machidon ◽  
Cornel Stanca ◽  
Petre Ogrutan ◽  
Carmen Gerigan ◽  
Lia Aciu
Keyword(s):  
Power System ◽  
Smart Environments ◽  
Power System Protection ◽  
Protection Device ◽  
System Protection

Simulation Design of Transformer Differential Protection Based on Mat Lab

2013 ◽  
Vol 722 ◽  
pp. 282-286
Author(s):  
Hong Hua He
Keyword(s):  
Simulation Model ◽  
Relay Protection ◽  
Fault Current ◽  
Differential Protection ◽  
Protection Device ◽  
Simulation Design ◽  
Transformer Protection ◽  
Internal Fault ◽  
Simulation Results ◽  
Transformer Differential Protection

The microprocessor-relay protection device has gradually replaced regular simulation relay protection it is also difficult to visually determine protection device malfunction or tripping. Therefore, the use of the Mat lab toolbox to build transformer differential protection simulation model, the simulation results show that two-line ratio brake can correctly identify internal fault current, and rapidly remove fault, and the system also can provide convenient for microprocessor transformer protection.

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