An electrostatic filter is a device consisting of plates (receiving electrodes) arranged vertically between which there vertically tensioned wires (electrodes) are electrically powered by the high voltage. A negative voltage applied to the emitting electrodes, generates the formation of electrons in the vicinity of these, which ionize the gas molecules. These ions are attracted by the collector plates and charge the dust by corona effect on their paths. These dusts are then attracted to the collector plates and adhere to it. Cleaning is provided by the Hammers striking regularly these plates allow to picking up the particles at regular intervals. The dust is thus collected to be evacuated. The obtained results of the different geometries showed that this aspect represents a dominant influence on the design and implementation of corona discharge reactor.

Generator protection system is one of the complicated industrial systems incorporating many group elements; measurement transformer, relays, circuit breakers and wiring connectors. Generally, protection systems are described using four characteristics; dependability, Sensitivity, rapidity and selectivity. The stator earth fault is a relatively common type of fault. The generators normally have grounded high impedance, that is to say, a ground via a neutral point resistor. This resistance is normally dimensioned to give a ground fault current of the order of 5 to 15 A in the event of permanent earth fault in high voltage terminals of the alternator. Relatively low ground fault currents cause. The new protection technique, it is called an intermittent defect, this type of defect usually has the following characteristics, A very short earth current pulse of high intensity (up to several hundred amps), lasting less than 1 ms. It occurs / disappears automatically over half a period, possibly over several periods, depending on the state of the power grid and the characteristics of the fault. Over longer periods (from several seconds to several minutes), it can evolve into a permanent fault.

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