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-.
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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 , , .
Abstract Critical loads on shipboard installations require electric power of good quality, i. On the contrary, current is determined by the various loads supplied, therefore, current quality can not be easily controlled, despite that current distortion is also reflected to voltage, via the voltage stanwg on circuit impedances.
CRYSTAL is a multi-function console able to change very quickly context and thus mission to meet the new constraints of operations Centers: Thus, the same series of loading scenarios for an entire range of turning azimuth angles of a twin pod configuration are considered. More specifically, the motor system considered is a naturally commutated series excited rotor machine where the excitation current is obtained naturally by placing the excitation winding in the dc link.
The latter require high power for a very short interval and therefore introduce certain severe power quality problems to the ship electric network, especially referring to voltage and frequency modulation. A brief discussion is also made on 10088 causes, consequences and remedies of harmonic distortion in the electrical plants, while measurements conducted onboard HN MEKO class frigates are presented.
Voltage and Frequency modulation. These standards refer to continental grids, however, as they have recently issued, they have introduced several new aspects on PSQ terminology and problem resolution. Click here to have a look at Crystal Video. Also get an email with jobs recommended just for me.
At a second stage, stajag paper aims at recommending some amelioration of standardization status.
AES, pulsed loads, modulation, power quality, railgun, simulations. The method followed covers the variety of dips occurring on shipboard installations in its entity. Swells can be harmful for electrical insulation .
However, the electric network is actually earthed via the dtanag impedance capacitances of all the equipment installed onboard. Based on salaries. In Fig 5, voltage and frequency modulation is shown. Voltage and Current spikes and transients have several adverse consequences such as equipment failure and improper operation of the entire system, like:.
Based on the results of the simulations two new methods of voltage dip classification are presented. This paper proposes a current- dependent grounding resistance model considering the soil ionization.
A transient and a stanga are a sudden, non-power frequency change in stqnag or current, or both. Thus, a summary is given on past editions along with the introduction of the last proposed scheme. A surge arrester can absorb the energy of a spike or a transient and it is the most typical way to protect loads from experiencing problems by this type of phenomena. They can be unidirectional or oscillatory in polarity. This overview makes a short but coherent description and categorisation of the PSQ phenomena causes, consequences, characteristic parameters etc and is enriched by cross-references to relevant standards international and national, military and commercial applied in shipboard applications.
Philippakou, and John M. It is based on pattern recognition methods, such as k-means, adaptive vector quantization, self-organizing maps, fuzzy k-means and hierarchical clustering, which are theoretically described and 1008 adapted.
Therefore, limitations on current as considered in some standards are necessary in order to guarantee high quality of the voltage.
In continental systems this low value systematic fluctuations of voltage are measured by the flickermeter and the phenomenon is referred to as flicker due to the effect that it has on lighting. Abstract In this paper a new pattern recognition methodology is presented for the classification of the daily chronological load curves of ship electric consumer equipment and the determination of the respective typical load curves of each one of them.
Their duration depends on the protection system operation, which varies from half-cycle fuse operation stansg several cycles operation of circuit breakers. Finally, general conclusions are drawn regarding the problems that will be emerged at the future integration of electrical pulsed loads into warships, the design of their power systems and the energy storage systems in order to ensure operational characteristics imposed by relative standards.
However, limited research work has been reported even for more conventional ship types stqnag the investigation and classification of PSQ phenomena.
Considering that the ship system electrification eventually dominates according to the All Electric Ship concept, PSQ issues turn to be a key-factor of the normal operation, survivability and safety aboard.
Abstract In this paper a discussion of the sources and effects of Voltage and Current spikes and transients in shore and ship stznag power networks and the characterization parameters and methods are presented. Further mitigation actions include resonant earthing system via Petersen coils, which can counter-balance the leakage capacitive currents. Thus, the typical electric network of a warship in the context of the AES is considered, focusing mainly on appropriate etanag and studying the consequences of a pulsed load along with the propulsion motors and the generator set.