During generator operation, due to external, internal and malfunction reasons, the generator may cause various faults or abnormal conditions. Common faults are:
(1) Stator fault: winding phase. -short circuit between phases, short circuit between turns, single-phase earthing, etc.
(2) Rotor winding failure: the rotor is grounded at two points, the rotor loses its excitation function, etc.
(3) Other faults: generator catches fire, generator switches to engine operation, generator leaks water and hydrogen, generator oscillates or loses synchronization, generators do not are not synchronized, etc.
The appearance of these faults will cause the generator to exit the system, or even the combustion of certain equipment. Special precautions must therefore be taken during daily operation and maintenance to avoidaccidents.
Air cooling: The system is simple and does not require a special hydrogen system or associated sealing oil systems, or a cooling water system for the generator. There is no need to consider the damage caused by water or hydrogen leakage to the generator, but the cooling effect is worse than hydrogen cooling and water cooling.
Hydrogen cooling: The system is complex and requires specialized hydrogen production equipment and a corresponding sealing oil system. It is sensitive to nearby fire. Although the cooling effect is good, it will gradually be used due to its complexity. system and tedious maintenance.
Water cooling: The effect is good and the system is relatively simple. It requires a special cooling water supply system and is susceptible to leakages of generator water and the conductivity of the cooling water.
Personally speaking: Air cooling system is the simplest, followed by water cooling and finally hydrogen cooling.