Group items tagged

Aside from impacting or not impacting electricity rates, system loss reduction has the following benefits: Reduction of fuel emissions due to lesser use of fossil-fuel generating plants - this has societal impact as it cover environmental concerns. Utility system capacity savings - decrease in losses provides released extra capacity for the distribution lines and transformers. Promotion of Energy Efficiency - it will be noted that the Distribution Utility (DU) is an energy-efficient electric company as it tries to decrease its system loss. Improvement of system voltage profile - the utility is regulated to supplying a range of voltage level and reduction of losses will produce a marginal system voltage quality that may be acceptable. This will also provide good power quality at the convenience outlets of consumers allowing their electric equipment/appliances to operate without mis-operation or loss of life. Increase Utility Commercial Appeal - a DU aiming at system loss reduction gets an added commercial appeal in the restructured power industry. This is important in the changing environment of the power industry, have you seen MERALCO TV commercials?

To all, who know how to solve the problems mathematically, something for you all? Please solve it Kirchoff’s Current Law (KCL): At every node, the sum of all currents entering a node must equal zero. Kirchoff’s Voltage Law (KVL): The voltage law says that the sum of voltages around every closed loop in the circuit must equal zero.

In this work, some fundamental aspects concerning the efficiency of induction machines are treated. The standards and the therein prescribed methods for the determination of the energy efficiency of induction machines are discussed. A detailed comparison of the four most relevant and recent methods identifies the differences. By means of measurement results of different machines, the differences between and the shortcomings of certain methods is confirmed. In that context, special attention is paid to the new, so-called ‘Eh-Y’ method. A concise overview of the most important points of attention for an increased efficiency of motor drives en the role of the induction motor (efficiency) in this context is completed with some examples. The difference between motor and generator mode is discussed and explained based on measurement results of machines of different size and efficiency class. Special attention is paid to the behaviour and performance of induction machines supplied by unbalanced voltages. More specifically it is investigated if and how the susceptibility to voltage asymmetry is influenced by material choice, in which the main focus lies on copper rotor technology. Therefore, the different standards for the description and quantification of voltage unbalance are studied first. The theoretical discussion is backed-up with experimental results of several machines.

Before going any further, let's look at the forces driving energy harvesting, aka energy scavenging. While it would be convenient to say the technology's rise is tied directly to the "green" movement, it really results from a confluence of factors: Device output voltage is increasing, power-management circuits have lower losses and higher efficiency, and ICs that actually do the intelligent work and data transmission are operating at ever-decreasing voltage and power levels.

Take an artificial pacemaker. This device transmits an electrical voltage to the biological pacemaker cells of the heart. In a healthy human, these pacemaker cells generate their own action potential, an electrical waveform of about 100 millivolts. This may not sound like much energy until we remember that this electrical potential is sustained across an insulating membrane only five nanometers thick. That is 5 billionths of a meter. So the energy of an action potential is almost 20,000,000 volts per meter. Compare this to the 12,000 volts per meter at a standard wall plug. Healthy pacemaker cells spark the electrical wave that drives heart muscle contraction. When these cells malfunction, an artificial pacemaker may be implanted to take over. Waves of electrical voltage generated at the metal lead of the artificial device cross over to living tissue and initiate normal muscle contraction.

The rule specifically applies to liquid-immersed transformers and medium-voltage, dry-type transformers. Utility transformers are already extremely efficient at delivering energy with minimal losses, but because they handle large amounts of electricity, small gains in efficiency can yield large energy savings. According to the published rule, the new rule could raise the cost of liquid-immersed transformers by up to 12%, but should decrease electrical losses by as much as 23%. It could also raise the cost of medium-voltage, dry-type transformers by up to 13%, but should decrease electrical losses by as much as 26%.

The Belgian site under study in this paper is connected to the public transmission grid (380 kV) by a High Voltage (HV) station

inventor of a revolutionary, affordable, clean energy technology

He was apparently on his way to Europe where he was to secure major funding for the development and commercialization of his technology, which could make oil obsolete

DeGeus was the inventor of a thin wafer-like material/device that somehow specially aligned the atoms or electron currents ongoing in that material, so that the wafer produced a constant amperage at a small voltage – continuous real power, or in other words a strange kind of “self-powering battery

With a range of approximately 60 miles (100 kilometers) the all electric Micro-Vett Fiat Doblò 5 seat station wagon, powered by a 18 kWh Altairnano NanoSafe® battery pack is undergoing field trials in Oslo, Norway. The battery pack was  recharged three times, in less than ten minutes using a high voltage rapid charging system