Results 221 to 230 of about 13,024 (250)

Transient overvoltage protection for UPS applications

2011 IEEE Trondheim PowerTech, 2011
Uninterruptible Power Supplies (UPS) are used to ensure a continuous and reliable supply to critical loads. Different UPS technologies are available, offering different levels of load protection and power conditioning. This paper discusses various UPS topologies and operating modes, identifying the paths over which a surge or transient voltage may ...
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Overvoltage protection for range extended electric vehicles

AFRICON 2015, 2015
This paper deals with a protection circuit against an overvoltage caused by a sudden battery removal from the dc link terminals. The system can be protected against this overvoltage by opening the neutral point of the generator and by engaging a dissipating resistor across the dc link terminals. This method is successfully tested and validated.
Mulugeta Gebrehiwot, Dimo Stefanov, Alex Van den Bossche   +2 more
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The IGBT with monolithic overvoltage protection circuit

[1993] Proceedings of the 5th International Symposium on Power Semiconductor Devices and ICs, 2002
A novel IGBT (insulated-gate bipolar transistor) with a monolithic overvoltage protection circuit has been developed to obtain high resistance to overvoltage stress. This device is characterized by novel integration of an avalanche diode with an IGBT structure.
T. Yamazaki, Y. Seki, Y. Hoshi, N. Kumagai   +3 more
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Overvoltage and surge protection in DC-systems

2012 International Conference on Lightning Protection (ICLP), 2012
DC-systems have been on the rise over the last years. The need for an effective surge and overvoltage protection for DC-systems increases accordingly. Both the current installation standards for SPDs and also the product standards mainly focus on the application of SPDs in AC-systems. Therefore this paper analyses based on measurements and calculations
J. Birkl, P. Zahlmann
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Overvoltage protection of light railway transportation systems

2003 IEEE Bologna Power Tech Conference Proceedings,, 2004
In this paper the behavior of the power supply system of a typical light railway transportation system (LRTS) subjected to overvoltages of atmospheric origin is analyzed, with the purpose to determine the optimum location of the surge arresters. A complete model of the whole power system has been developed and the transients have been simulated with ...
DELFINO, FEDERICO, PROCOPIO, RENATO, ROSSI, MANSUETO   +2 more
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Overvoltage protection and insulation coordination

2015
The surge arrester at the line entrance must be installed for the protection from fast-front overvoltages. The selected surge arrester in the simulation model has a sufficient performance for the assumed lightning strike and other conditions. The standard rated lightning impulse withstand voltage can be selected from 1,050, 1,175, 1,300, and 1,425 kV ...
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Overvoltage protection of gas-insulated substations

Power Engineering Journal, 1987
Increasing demand for electrical power in centres of large conurbations has led to the development of compact gasinsulated substations. For these it is not possible to follow established practice of fitting co-ordination gaps, and therefore surge arresters have to be used to limit ...
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Overvoltage protection for battery powered equipment

Journal of Power Sources, 1998
An overvoltage protection circuit for a CMOS electronic multimeter circuit uses a pair of complementary field-effect protection transistors connected to each input line of the meter circuit. The gate electrodes of the protection transistors are connected to bias voltage sources which provide bias voltages with magnitudes slightly less than the meter ...
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Lightning overvoltage protection for financial computerizing systems

Proceedings. Asia-Pacific Conference on Environmental Electromagnetics. CEEM'2000 (IEEE Cat. No.00EX402), 2002
Financial systems are nowadays dependent on electronic data processing technology. One of the most frequent causes of failure in this highly sensitive system are overvoltages mostly caused by lightning. This paper describes how lightning electromagnetic pulse intrudes into computer information systems and causes system damage. Damage prevention is also
null Qui Chuan Rui, null Li Shui Guang
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Overvoltage protection

2016 51st International Universities Power Engineering Conference (UPEC), 2016
Mohamed Darwish, Christos Marouchos, Panagiotis Dimitriadis   +2 more
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