Results 71 to 80 of about 286 (123)
[Experience with the execution of deratization by dusting. I].
Zhurnal mikrobiologii, epidemiologii i immunobiologii, 1969 openaire +1 more source
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Device for Deratization «Shild»
Приборы и системы. Управление, контроль, диагностика, 2022В статье рассмотрен разработанный в рамках заказной НИОКР прибор для дератизации «Щит», осуществляющий защиту от грызунов, используя принцип электрического воздействия высоковольтными импульсами напряжения при замыкании грызуном двухпроводного электрического контура, реализованного на защитном электрическом барьере.
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Intelligent derating for reliability
Proceedings IEEE International Symposium on Intelligent Control 1988, 2003An approach to design for reliability based on the formulation of derating criteria, the determination of levels of criticality for derating analysis, and production rule derating is presented. The approach utilizes Prolog procedures to generate a user-definable hierarchy of parts classifications whose working parameters follow user-definable ...
M. Pecht, R. Cogan
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Cable crossings-derating considerations. I. Derivation of derating equations
IEEE Transactions on Power Delivery, 1999Dangerously high interference temperatures can occur at points where cables cross external heat sources even when the crossing occurs at 90/spl deg/. For perpendicular and oblique crossings, these interference temperatures are usually ignored for distribution circuits, whereas for transmission cables, corrective actions in physical installation ...
G. Anders, H. Brakelmann
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Harmonics-transformer derating
Proceedings of Industrial and Commercial Power Systems Conference, 2002Power transformers supplying nonsinusoidal load current often need to be derated. The ANSI/IEEE C57.110-1986 standard provides a method by which derating may be performed. However, derating only provides an estimate of remaining transformer capacity, since subsequent load may significantly change the relative harmonic current values.
D.W. Egolf, A.J. Flechsig
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Cable crossings-derating considerations. II. Example of derivation of derating curves
IEEE Transactions on Power Delivery, 1999For pt.I see ibid., vol.14, no.3, p.705-14 (1999). Cables crossing other heat sources either perpendicularly or at oblique angles will experience a rise in conductor temperature which should result in ampacity derating. In the first part of the paper a mathematical model for calculation of derating factors was presented.
G. Anders, H. Brakelmann
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2016
In previous chapters, we discussed the converter with or without fault. The common similarity between them is that they continue to operate without reduction of their nominal specification. In this chapter, uninterrupted operation of a faulty power conversion system with catastrophic damages in some of its parts is investigated.
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In previous chapters, we discussed the converter with or without fault. The common similarity between them is that they continue to operate without reduction of their nominal specification. In this chapter, uninterrupted operation of a faulty power conversion system with catastrophic damages in some of its parts is investigated.
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Ampacity derating for underground cables
Conference Record, Industrial and Commercial Power Systems Technical Conference, 1988., 2003A simple manual method of utilizing adjustment factors to derate cable ampacities for underground installations is presented. The ampacity adjustment factors reported are obtained based on the Neher McGrath method. Various items that affect ampacities of cables are discussed in practical terms and examples are included to illustrate the method and its ...
F. Shokooh, H.M. Knutson
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Understanding the subtleties of brick derating
INTELEC 07 - 29th International Telecommunications Energy Conference, 2007In most cases, the brick converter suppliers provide derating charts for their converters. One would think that it would be easy to compare the converters based on the conditions shown in these derating charts, but unfortunately by doing so one can be easily deceived. Typically these suppliers are providing this information not only as a service to the
Barry A. Ehrman +2 more
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Reliability Parts Derating Guidelines
1982Abstract : Derating can be defined as the practice of limiting electrical, thermal and mechanical stresses on devices to levels below their specified or proven capabilities in order to enhance reliability. If a system is expected to be reliable, one of the major contributing factors must be a conservative design approach incorporating part derating ...
D. C. Towns +3 more
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