Meeting of resistors common faults and processing:
In operation, a single-phase grounding is the most common fault. It will further expand the stator winding insulation damage and even iron core sintering, if it does not discover and quickly remove the fault in time, it will develop as a phase or Times short circuit. Based on the above reasons, the generator neutral point is combined with the resistor cabinet to limit the ground current to prevent the harm of various overvoltage.
The neutral point can limit the fault current to the appropriate value by resistor grounding and resistance cabinets, and improve the sensitivity of relay protection to trip, but also makes the fault point may only occur local slight burns, and the transient overvoltage is limited to normal line. The voltage is 2.6 times that of the neutral point voltage, limiting the reinforcement of the arc, prevents the arc gap over voltage damage main equipment, and can effectively prevent the ferromagnetic resorveation voltage, thereby ensuring that the generator in the resistor can be safe and operating normally.
Neutral point ground resistance cabinets are a good set of grounding equipment, including ground transformers, and their equipment has been well developed, and they also have a wide range of applications, usually we can install it. In the power plant plant power system, power supply system, mineral enterprise power distribution system, realizes the system operating mode of the electrical network.
Compared to comparison, the neutral spot resistor is also suitable for applications where the system neutral point is small resistance or medium resistance. Has a certain for performance, when we fail during the use of its equipment, it is necessary to immediately trip the disabled route to solve the problem.