The paper aims to assess sources of error in attempting to meet standards for the measurement and reporting of negative sequence voltage unbalance. This is of importance when making use of low performance instrumentation where three difficulties may arise: (i) rms voltages rather than the fundamental is used; (ii) the magnitude but not the phase of line-neutral voltages are available; and (iii)...

Requirements of low vibration and noise level are imposed on reactor plant centrifugal pumping equipment. Computational research characteristics is required in order to choose the optimal design alternate. Representativeness adequacy computational ensured by using verified methods mathematical modeling. The paper presents results comparative analysis various options pump wet end with hydraulics...

The success of a satellite mission is dependent on the accuracy of the measurement of its mass properties. Mass properties of a satellite viz. static and dynamic unbalance play a vital role in during satellite launching and attitude and orbital control. Satellite’s center of gravity (staic unbalance) and product of inertia (dynamic unbalance) are measured in Vertical Dynamic Balancing Machine (...

The single-phase traction load has essentially an unbalance characteristic at the Point of Common Coupling (PCC), which injects harmonic into the utility grid. In this paper, the effect of harmonic distortion and unbalance loading are investigated simultaneously for electrical railway systems. Special traction transformers (i.e. single-phase, V/V, Wye-Delta, Scott, and Le Blanc) are used betwee...

A model is proposed to describe the local connection between the capacitive and the inductive unbalance functions of two neighbouring twisted pairs. A realistic simulation of the unbalance functions indicates that the constant ratio of the inductive unbalance with respect to the capacitive unbalance is a workable model. Using this model, it is demonstrated that the calculation of the reflective...

Misalignment and unbalance are the major concerns in rotating machinery. When the power supply to any rotating system is cutoff, the system begins to lose the momentum gained during sustained operation and finally comes to rest. The exact time period from when the power is cutoff until the rotor comes to rest is called Coast Down Time. The CDTs for different shaft cutoff speeds were recorded at...

For reversible data hiding, the histogram-based difference expansion (DE) is one family of the generic methods where secret bits are embedded into an image by DE on prediction error. However, the ratio of the count of bit 0 to that of bit 1, embedded into the pixels with the same prediction error, will vary with the image and the secret bits, which leads to the embedding unbalance and image dis...

Whenever devices are operated in parallel, due consideration should be given to the sharing between devices to ensure that the individual units are operated within their limits. Items that must be considered to successfully parallel MOSFETs are: gate circuitry, layout considerations, current unbalance, and temperature unbalance. This application note covers these topics and provides guidelines ...

In this paper, the issue of balance pattern of the interaction columns of a symmetrical design is considered according to orthogonal components system. The minimum interaction unbalance criterion is proposed for ranking and comparing s-level factorial designs, where s is any a prime or a prime power. It is further showed that the interaction unbalance pattern is just the generalized wordlength ...

In order to diagnose the unbalance of aerostatic guideways, displacement and acceleration sensors were used to measure the vibration signals of the unbalance of the aerostatic guideways caused by the gas fluctuation. The frequency characteristics for the unbalance of aerostatic guideways caused by gas fluctuation has been extracted from the measured signals by power spectral density, and the ba...