型号: ITG7166       颜色:       重量:

详细介绍：

HV/HV or HV/LV power transformers may be damaged by internal faults, or by external faults such as overload or short-circuit which cause overheating and excessive electro dynamic stresses in the windings. Internal faults consist in inter-turn faults, or short-circuits between windings, or between one winding and the core or tank, their current being variable according to the location. Detection and elimination of these different faults may require several types of protective relays. Their functions and use are explained in the following text. However, faults affecting the magnetic circuit itself (local overheating due to induced currents) cannot be detected by electrical protection, and are monitored by a mechanical relay, actuated by the gas accumulation or surge caused by the fault (oil immersed transformers for example).