حامد گرگین پور

One of the factors that lead to the rotating electric machines and the exit of the circuit, damaged bearings these machines. Factors such as the change of chemical properties of oil of bearingsا, in effect passing electric current caused by voltage induction mines, such as the creation of sparks between the shaft and the shaft voltage effect on bearings caused the phenomenon of pitting on the surface of a spark between them and place the call to the shaft and bearing. In terms of whether the shaft of high endurance against this phenomenon can be enjoyed, so this topic is mainly "caused a malfunction in the brings of generator is a special significance in this context. In this treatise on shaft voltage of synchronous generators case analysis will be done. Induction Voltage change causes the shaft coming out of the current in bearings. These currents will pass through bearings oil and to highly damage chemicals property bearings oil. If the size of the surface of the shaft voltage dielectric Breakdown voltage corresponding to the oil contained in the layer are beyond bearing, he flow of this stream will be passed through bearings which leads to getting a lot of damage to the generator bearings. Induction voltages in order to analyze the exact modeling system of shafts, a case study is required. In this epistle, more complete model is tried in order to analyze this phenomenon in synchronous generators presented To reduce the voltage, there are different ways that some of these solutions has been investigated and the advantages and disadvantages of each of these is explained. To reduce the voltage, there are different ways that some of these solutions has been investigated and the advantages and disadvantages of each of these is explained.