A Precise Stator Ground Fault Location Method for Large Generators Based on Potential Analysis of Slot Conductors

A mathematical analytical modeling method for rotor eccentricity fault of large VSPSU

“…It is necessary to simulate the two types of faults in batches and analyze the differences between the two based on a large number of samples to achieve accurate fault diagnosis of VSPSUs. (2) The actual operating unit usually has a slight rotor static eccentricity, which will affect the main protection of the stator winding. It is necessary to simulate the short-circuit fault of the stator winding in batches in the state of rotor static eccentricity to realize the quantitative research on the main protection of stator winding.…”

“…A pumped storage power station has excellent peak and frequency regulation ability, which is an important guarantee for the power system with new energy as the main body. Compared with the traditional pumped storage unit, the VSPSU can adjust the wide power range efficiently in real-time, with a broader application prospect [1][2]. The rotor eccentricity fault is one of the most common fault types of the motors.…”

Design of a new low power protection method for pumped storage synchronous motor

“…Pumped storage power station mainly undertakes various tasks such as peak regulation, valley filling, frequency modulation, phase modulation and emergency reserve in the power grid, and can greatly improve the operating conditions of the power system, which plays an important role in ensuring the safety, stability and economic operation of the power system [1][2]. The main operating conditions of pumped storage motor are power generation, pumped, power generation phase modulation and pumped phase modulation [3][4][5].…”

A generator stator ground fault location method based on flexible optical current transformer

“…Stator single-phase ground fault is one of the most common fault types of generators [3]. At present, stator ground fault protection mainly includes fundamental voltage protection, third harmonic voltage protection, and injection protection composed of external low-frequency voltage sources, which together constitute two sets of 100 % stator ground fault protection [4]. In practical engineering, it is necessary to measure the insulation of the winding coil one by one based on the 'dichotomy' [5] to determine the fault position, which is time-consuming and laborious.…”

“…f represents the optimal objective function value and  represents the decision variable. The physical meaning of each parameter is given in [12]. For the actual faulty slot conductor, the optimal objective function value is 0, and the corresponding decision variable is the real fault position.…”