Implementation of protection circuit for over voltage and under voltage protection

Thentral, T. M. Thamizh; Palanisamy, R.; Usha, S.; Geetha, A.; Reagan, Anetor; Ramanathan, T.R.B.

doi:10.1016/j.matpr.2020.11.022

Cited by 5 publications

(4 citation statements)

References 9 publications

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Section: Guard Circuitmentioning

confidence: 99%

“…After optocoupler, P_V changes from logical low level to logical high level indicating the overvoltage protection, and U g changes to 0V. It can be seen that U g controls the MOS tube to be cut off quickly, so as to realize the over-voltage protection of the whole circuit[15][16] .Anti-reverse connection protection : when the input signal is negative voltage, U S is less than 0V, Compared with 0V signal, TL084-3 outputs +15V. After optocoupler, U g becomes 0V, controls MOS tube to cut off quickly .…”

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confidence: 99%

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Development of calibration device for on-load tap changer tester of transformer

Yang,

He,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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More and more transformer on load tap changers are being tested using the AC method, which is closer to the actual operating status of the transformer on load tap changers. From the analysis of the switch operating status, the test results are closer to the actual value. However, the existing calibration devices for transformer on load tap changer testers are all aimed at DC testers, and traditional calibration methods are difficult to achieve synchronous calibration of transition resistance, transition time, and synchronization under AC test signals. Therefore, this article designs a three channel variable AC resistor module based on FPGA controlled DAC to simulate different resistors. The variable resistor module can achieve fast switching of resistors through frequency compensation, and achieve synchronous verification of analog conversion resistance, conversion time, and synchronization. After testing, the maximum allowable error of the calibration device for simulating transition resistance is ± (0.3% RD+5 m Ω), and the absolute error of transition time and synchronization is less than 20us, which fully meets the needs of laboratory calibration and solves the calibration problem of the transformer on load tap changer tester.

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Section: Guard Circuitmentioning

confidence: 99%

mentioning

confidence: 99%

Development of calibration device for on-load tap changer tester of transformer

Yang,

He,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Normally, transmission lines have some voltage drop so even in normal conditions, the voltage supplied is slightly less than the normal value. Under voltage, the relay is used for protection to detect the fault location through the distance with the accurate fault type [10][11][12][13][14][15][16][17]. The design system in this paper proposes the use of Matlab/Simulink-based method to design enhancement and development of the undervoltage relay in the power system protection for fast and reliable fault classification and location of various types of fault.…”

Section: Original Research Articlementioning

confidence: 99%

Under-voltage Protection of Power Transmission Lines

Nasir

2023

JENRR

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The continuous monitoring of the protection relay of the transmission line is desirable to ensure the system disturbance such as fault inception is detected in the transmission line. Therefore, the fault on the transmission line needs to be detected, classified, and located accurately to maintain the stability of the system. This paper presents design enhancement and development under voltage relay in power system protection using MATLAB/Simulink. The contacts of the under-voltage relay operate when voltage drops below a set voltage. It is used for protection against voltage drops to detect the short circuit. This work is carried out for all types of faults which only related to one of the parallel transmission lines. In overall operation conditions, the sample data were generated for the system by varying the different fault types and fault locations. This design system proposes the use of the MATLAB/Simulink-based method for fault classification and location of various types of faults.

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“…This protector can be utilized directly between the supply and the electrical installation. In [16], a solution to over voltage and under voltage conditions had been proposed via a circuit capable to operate within a voltage range of 195-215 V. Any voltage level below or above this was not permissible.…”

Section: Introductionmentioning

confidence: 99%

Design of a Pure Transistorized Voltage Protector for SinglePhase Electrical Installations

Obais¹

2022

IJETAE

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In this paper, an electronic device is designed to protect single phase electrical equipment against overvoltage and undervoltage conditions. The protector is designed using pure transistorized circuitry to detect and offer the required protection against unwanted voltage fluctuations. The case study is the protection of 220V 50Hz electrical installations in the range of 220V±22V at the same 50Hz operating frequency. The device is designed and tested on PSpice using low cost electronic devices available on PSpice libraries. Simulation results have accomplished the desired protection during managing a variable voltage sweep starting from possible minimum voltage level to maximum voltage level. .

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Implementation of protection circuit for over voltage and under voltage protection

Cited by 5 publications

References 9 publications

Development of calibration device for on-load tap changer tester of transformer

Development of calibration device for on-load tap changer tester of transformer

Under-voltage Protection of Power Transmission Lines

Design of a Pure Transistorized Voltage Protector for SinglePhase Electrical Installations

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