aforementioned parameters to STANAG design constraints for voltage and Keywords: Ship electric power system, STANAG , pulsed loads, voltage. Ships. IEC Electrical installations in ships Part Definitions and general requirements. STANAG Characteristics of Shipboard. 31 Jul STANAG () referring to the electrical power plants in NATO. naval vessels. This is a standard that has come out of USA MIL-STD-.
|Published (Last):||18 December 2007|
|PDF File Size:||9.82 Mb|
|ePub File Size:||3.58 Mb|
|Price:||Free* [*Free Regsitration Required]|
However, limited research work has been reported even for more conventional ship types on the investigation and classification of PSQ phenomena.
In this way, several phenomena can be studied like those related to power quality on shipboard.
An opportunity has arisen for an engineer to exploit their reliability In this paper a coupled field and circuit model of a permanent magnet synchronous machine PMSM is introduced in order to reduce the effects of pulsating torque. Solutions to noise problems include filters, isolation transformers etc. 0108 The future electric power system of naval warships in the context of the All Electric Ship AES will supply energy to sophisticated stanga for propulsion, electric guns, electric launchers, high power sensors, navigation etc.
The proposed model is derived on the basis of energy balance of the stanab ionization. This paper proposes a new current-dependent grounding resistance model of a rod electrode considering the soil ionization. All the results and the differences in percentages between the resultant magnitudes are categorized and presented in tables hereafter.
Penetration tester sr Jobs for 1008
Aircraft Systems Integration Engineer skills and qualifications Aircraft Systems Integration Engineer – Stevenage. The first two consist the main system characteristic quantities that have to be kept intact and well within the limits set by the standards. Desai, All electrical systems are grounded, the difference is in the type and degree of isolating impedanceStaanag, Marine technology in transition, MarchAmsterdam. Moreover, the paper investigates, discusses and compares the relevant issues dealt by different standards inter-national and national, military and commercial applied to shipboard applications, taking into account the standard status of similar continental power systems and the perspective of the AES technology.
The approach is rather generic as only nameplate data of the motor drives tsanag required, while as the simulations focus on the electric motors, the rest of the ship electric system considered, including generator sets, is represented by a simplified network. Thus, power quality problems become almost transparent to the critical or sensitive equipment. The analysis is based on simulations, where the pod torque demands are obtained from experimental results recently published in the literature.
Environmental Engineer Lockheed Martin Corporation 6, reviews. One energy storage technology will not probably be the optimum solution for every application provided that power and energy densities must be adequate to achieve the power and energy levels required for naval applications within the allowable economic, size and weight constraints.
Voltage dip and swell propagation in a system is affected by the winding connections of the transformers. Fault-induced dip magnitude depends on the impedance of the source system strengthsystem configuration, fault impedance, fault type and the distance to the fault.
Therefore, an investigation of the influence of the zero sequence impedance is performed in representative case studies, all referring to unbalanced operating conditions. Abstract Sophisticated control techniques of AC motors have been extensively evolved via the space-vector theory, the mathematical presentation of which is often presented only for 3-phase arrangements, i.
Abstract Simulation of switching transients in electric energy systems requires accurate modeling of most of the components involved. The method presented is founded on the switching function techniques, which as it is shown does not require any specific branches of knowledge.
Fafalios, Phenomenological investigation of voltage spikes introduced by energizing low power electronic equipmentProceedings Int. Electric networks suffer from short time duration non-periodical disturbances of voltage and current caused by switching operations making or breakingshort-circuits, fuse blowing or even lightning strikes , , . Thus, the different aspects origin, characteristics, effect on loads, characterisation methods of several power quality phenomena are summarised.
Martzloff, No joules for surges: Aircraft Platform Integration Engineer Stevenage. The aforementioned may affect the operation of sensitive several subsystems of the ship such as radarscopes, communication equipment, missile guidance systems, gear systems etc.
Effects of capacitance between line and earth. Several efforts of countering the torque ripple focus on magnet pole shape optimization procedures while other efforts apply sophisticated modifications of control algorithms. Two different sets of simulations stabag considered, one comprising a synchronous AC motor drive and one with an asynchronous motor of similar rating. Harmonic power quality refers to the existence of distorted periodic voltage or current waveforms, which, can be expressed via mathematical Fourier analysis, as the superposition of an infinite series of frequencies, the fundamental one the so-called power frequency and its multiples, the high-order harmonics VnIn:.
Abstract Critical loads on shipboard installations require electric power of good quality, i.
The grounding staang for lightning currents is decreased due to the soil ionization. Abstract In this paper, voltage dips an important aspect of shanag quality are presented in the context of ship power systems.
The model consists of a voltage source in series with a variable resistance controlled by the value of the current produced. The possible consequences, most of which are of adverse nature are related to an unexpectedly large capacitive current due to the high cumulative capacitance are:.
Standardization Agreement – Wikipedia
In contradiction to other power quality problems, harmonic distortion is a steady-state phenomenon existing on a constant time basis, which means that the stresses occurred, though not severe, can eventually provoke an accumulative result often not easily explained. Lightning and switching actions are typical causes of spikes and transients. Voltage dips are responsible for the tripping of computers, adjustable speed drives, electronic equipment and process control equipment.
Job title, keywords, or company. Abstract An appealing motor drive operating as a DC series machine, is presented.
Abstract In the advent of All Electric Ship AES and electric warship in particular, several sophisticated and energy demanding electric systems are to be installed aboard including propulsion motors and pulsed loads.
In certain cases, this overview is supported by discussions of the way these issues are treated by certain related standards for shipboard installations, while where required cross references to relevant standards of continental grids is also made.
On this occasion, as the case studies especially in warships with extended electrification involve problems emerging from the integration of modern devices without authenticated circuit modeling, novel circuit models proposed or improved by the authors are presented and validated. Abstract This paper initially presents a comparative analysis both qualitative and quantitative of the scope and subject of IEC and IEC highlighting points of convergence and divergence between them, while certain critical issues emerged is also underlined.