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HIGH SPEED INDUCTION GENERATOR FOR APPLICATIONS IN
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... airborne applications because of reliable operation and high power density. To function reliably in the speed range of 60000 RPM to 120000 RPM, the rotor of the electric generator must be robust. Examples of the robust rotor technologies for the generator include: permanent magnet (PM), induction an ...
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... required for safe operation of the equipment is not compromised. Additional space between units may be required. E. Circuit Overloading - Consideration should be given to the connection of the equipment to the supply circuit and the effect that overloading of circuits could have on over current prot ...
High Impedance Fault Detection on Distribution Systems
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... which control action a utility should take. Each utility will have to determine a control strategy to fit their goals. However, it will be important to carefully document decisions and reasonings. No high impedance detector or overcurrent device can protect from initial contact. There is agreement w ...
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... transmission system. These devices are making use of three distinct methods to detect an open line condition : 1) trip signals coming from line protection relays 2) auxiliary contacts associated with breakers and disconnecting switches 3) low current measurements The first method consists in monitor ...
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Islanding

Islanding refers to the condition in which a distributed generator (DG) continues to power a location even though electrical grid power from the electric utility is no longer present. Islanding can be dangerous to utility workers, who may not realize that a circuit is still powered, and it may prevent automatic re-connection of devices. For that reason, distributed generators must detect islanding and immediately stop producing power; this is referred to as anti-islanding.The common example of islanding is a grid supply line that has solar panels attached to it. In the case of a blackout, the solar panels will continue to deliver power as long as irradiance is sufficient. In this case, the supply line becomes an ""island"" with power surrounded by a ""sea"" of unpowered lines. For this reason, solar inverters that are designed to supply power to the grid are generally required to have some sort of automatic anti-islanding circuitry in them.In intentional islanding, the generator disconnects from the grid, and forces the distributed generator to power the local circuit. This is often used as a power backup system for buildings that normally sell their excess power to the grid.
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